JP4662299B2 - Tabletop cutting machine - Google Patents

Description

  The present invention relates to a tabletop cutting machine, and more particularly to a tabletop cutting machine in which a turntable for placing a processing member is rotatable or a circular saw blade can be inclined with respect to the turntable.

  The tabletop circular saw, which is a tabletop cutting machine, includes a base, a turntable carried on the base, and a circular saw blade. The processing member is placed on the turntable and the processing member is cut. Things have been known for some time. The turntable of the tabletop circular saw is rotatable with respect to the base, and the circular saw blade is disposed above the turntable. The circular saw blade is supported by the cutting part, and the cutting part is supported by the swing support part so as to be swingable above the turntable. The swing support portion is supported by the tilt support portion, and the tilt support portion is supported by the base portion, and supports the circular saw blade so as to be tiltable with respect to the base portion. A tabletop circular saw having such a configuration is described in, for example, Japanese Patent Application Laid-Open No. 2000-254817.

JP 2000-254817 A

  Here, it is conceivable to apply a recent electronic technology to provide a display unit for digital display on the table circular saw and display the rotation angle of the turntable and the inclination angle of the circular saw blade as described above. As described above, in order to digitally display the angle by providing the display unit, it is necessary to provide a rotation angle detecting device for detecting the rotation angle of the turntable on the table circular saw.

  As the rotation angle detection device, for example, provided with an optical sensor and a substantially disk-shaped detected part that rotates as the turntable rotates, the detected part is formed with slits at equal intervals in the circumferential direction, A configuration is possible in which the detected portion rotates integrally with the slit as the turntable rotates and the optical sensor detects a pulse generated in the slit. For example, when the interval between the slits is set so that one pulse is generated when the turntable is rotated by 0.05 °, it is 900 when the turntable is rotated from 45 ° to 45 °. Generate a pulse. A tilt angle detecting device having the same configuration can be considered.

  In the display unit, for example, instead of updating and displaying the rotation angle every time the turntable is rotated by 0.05 °, a predetermined display with a certain degree of goodness such as 0.2 ° is provided so that the user can easily see. It is conceivable to update and display each unit rotation angle. More specifically, as the turntable is rotated, it may be possible to update and display such as..., 34.8 °, 35.0 °, 35.2 °,.

  Similarly, in the display unit, for example, instead of updating and displaying the tilt angle every time the circular saw blade is tilted by 0.05 °, the display portion has a certain degree of goodness such as 0.5 ° so that it can be easily seen by the user. It is conceivable to update and display for each predetermined display unit tilt angle. More specifically, as the circular saw blade is tilted, it may be possible to update and display such as..., 34.0 °, 34.5 °, 35.0 °,.

  However, it may be inconvenient if only such an integer multiple of the predetermined display unit rotation angle and an integer multiple of the predetermined display unit tilt angle can be displayed. For example, when cutting a molding material as described in JP-A-11-254401, a specific rotation angle such as 22.5 ° or 35.3 ° or a specific inclination angle such as 33.9 ° is used. It must be possible to display on the display unit. In addition, a mechanical stopper mechanism is provided for a specific angle frequently used by the user as described above so that the user can stop at a specific angle without adjusting the angle while looking at the scale. Yes. However, when the mechanical accuracy of such a stopper mechanism is worse than the display accuracy of digital display (for example, when the predetermined display unit is 0.2 ° unit, the display accuracy is ± 0.1 °), 45.0 When the stopper mechanism of ° is set, the digital display becomes 45.2 °. Therefore, even when the user does not need so much accuracy, if the digital display becomes 45.2 °, the user will feel distrust.

  Therefore, an object of the present invention is to provide a tabletop cutting machine that can display an angle range that is not equally divided at a specific rotation angle, a specific inclination angle, and an angle in the vicinity thereof.

In order to achieve the above object, the present invention provides a base that supports a workpiece, a turntable that is rotatable with respect to the base supported on the base, a cutting portion that supports a cutting blade, A tabletop cutting machine provided on a turntable and having a support part that swingably supports the cutting part above the turntable, and detecting a rotation angle of the turntable with respect to the base; Generated by a rotation angle detection device that generates one pulse each time the table rotates by a predetermined unit rotation angle, a display unit for displaying the rotation angle of the turntable, and the rotation angle detection device Control means for changing the display angle to be displayed on the display unit according to the number of pulses to be performed, and the angle position of the predetermined turntable is defined as a specific rotation angle position, which corresponds to an integral multiple of the unit rotation angle. The angle to And示単position pivot angle, wherein comprises a specific rotational angular position, when a specific rotation angle display range a large angular range than the display unit rotation angle, the control means, the pivoting angle detected According to the number of pulses generated by the device, the display angle is updated for each display unit rotation angle corresponding to an integral multiple of the unit rotation angle, and the angular position of the turntable is displayed as the specific rotation angle display. When the position is within the range , one feature is that the specific rotation angle is displayed on the display unit without updating the display angle for each display unit rotation angle.

Another feature of the present invention is that the control means displays the display angles on both sides of the specific rotation angle in a range smaller than the display unit rotation angle .

  Another feature of the present invention is that the specific rotation angle position includes a position where the rotation angle of the turntable is 0 °. Another feature of the present invention is that the control means includes a predetermined angle range including an angular position of a predetermined specific rotation angle at which the angular position of the turntable does not coincide with an integral multiple of the display unit rotation angle. In the case of being located, the specific rotation angle is displayed, and the display angles on both sides of the specific rotation angle are displayed in a range smaller than the display unit rotation angle.

Another feature of the present invention is that a base portion that can support a machining member, a cutting portion that supports a cutting blade, a swingable support of the cutting portion above the base portion, and a tilt to the base portion. A table-top cut-off note having a support portion that is supported so as to detect the tilt angle of the cutting blade relative to the base portion, and generate one pulse each time the cutting blade tilts by a predetermined unit tilt angle. A tilt angle detecting device for displaying, a display unit for displaying the tilt angle of the cutting blade, and a control means for changing a display angle displayed on the display unit according to the number of pulses generated by the tilt angle detecting device. A predetermined tilting position of the cutting blade as a specific tilting angle position, an angle corresponding to an integer multiple of the unit tilting angle as a display unit tilting angle, including the specific tilting angle position, and from the display unit tilting angle Specific tilting over a large angle range When the degree display range control means, depending on the number of pulses tilting angle detection device occurs, and updates the display angle on the display unit tilting angle each corresponding to an integral multiple of the unit tilt angle When the angular position of the cutting blade is within the specific tilt angle display range, the specific tilt angle is displayed on the display unit without updating the display angle for each display unit tilt angle. It is in.

Another feature of the present invention is that the control means displays the display angles on both sides of the specific tilt angle in a range smaller than the display unit tilt angle . Another feature of the present invention, the specific tilt angle position is that the tilt angle of the cutting blade comprises a position of 0 °. Furthermore, another feature of the present invention is that the control means is configured such that the angular position of the cutting blade is within a predetermined angular range including an angular position of a predetermined specific tilt angle that does not match an integer multiple of the display unit tilt angle. In this case, the specific tilt angle is displayed, and the display angles adjacent to the specific tilt angle are displayed in a range smaller than the display unit tilt angle.

  According to the tabletop cutting machine of the first and fourth aspects of the present invention, when a stopper mechanism for stopping at a specific angle is provided, the digital display is performed even when the mechanical accuracy is worse than the display accuracy of the digital display. Can be displayed at a specific angle, and the user can be prevented from feeling distrust.

  A tabletop cutting machine according to a first embodiment of the present invention will be described with reference to FIGS. A tabletop saw 1 that is a tabletop cutting machine shown in FIGS. 1 and 2 includes a base portion 2 that is arranged on the floor and carries a member to be cut such as wood on the upper surface, and a cutting portion 4 that cuts the member to be cut. The support portion 3 is configured to support the cutting portion 4 so as to be swingable and tiltable.

  As shown in FIG. 1, the base portion 2 includes a base 11 that is a grounding portion, a turntable 21 that is rotatable with respect to the base 11, and a member to be cut by contacting the side surface of the member to be cut on the base 11. And a fence 12 for positioning. In the following description, the direction in which the surface of the fence 12 that contacts the member to be cut faces is the front side of the tabletop circular saw 1, the floor surface on which the base 11 is installed is the lower side of the tabletop circular saw 1, and the fence 12 Are defined as the left-right direction, and are treated as the front-rear, left-right, and upper-lower sides, respectively.

  As shown in FIGS. 1 and 3, the base 11 includes a right base 11A and a left base 11B separated from each other with the turntable 21 therebetween, and the top surfaces of the right base 11A and the left base 11B are cut. It is a surface which carries a member. Between the right base 11A and the left base 11B, as shown in FIGS. 3 and 5, an arc portion 16 formed in an arc shape in the forward direction with respect to the right base 11A and the left base 11B is provided. ing. The side surface portion of the arc portion 16 is located on the circumference with the rotation axis of the turntable 21 as a center point. As shown in FIG. A plurality of locking grooves 16a to be engaged with the convex portions 26B are formed. These locking grooves 16a have, as a reference axis, an axis that extends forward from the center point and orthogonal to the fence 12, and has a predetermined angle with respect to the reference axis (0 °), such as 15 °, 30 °, 45 °, or the like. It is formed at a predetermined angle. Further, as shown in FIG. 5, a connecting portion 15 is provided between the right base 11A and the left base 11B so as to contact the floor surface and connect the right base 11A and the left base 11B. A rotation support portion 19 that rotatably supports the turntable 21 is provided near the center of the connecting portion 15.

  As shown in FIGS. 1 and 3, the fence 12 includes a right fence 12A and a left fence 12B. The right fence 12A is supported on the right base 11A, and the left fence 12B is supported and fixed on the left base 11B. Yes. The wall surfaces of the right fence 12A and the left fence 12B that are in contact with the members to be cut are formed substantially perpendicular to the upper surface of the base 11 that carries the members to be cut. In addition, as shown in FIG. 2, the left fence 12B is provided with a rotating fence 12C made of a separate component from the left fence 12B so as to be rotatable about a rotation shaft 12D provided on the left fence 12B. Therefore, as shown in FIG. 4, when the cutting part 4 is tilted, even if the cutting part 4 is swung by turning the rotating fence 12 </ b> C, a circular saw blade 123 (described later) is attached to the fence 12. Does not touch.

  As shown in FIGS. 5 and 6, an arcuate external gear 20, which is an arc centered on the central axis of the rotation support portion 19, is fixed with screws 20 </ b> A near the rear of the rotation support portion 19 on the upper surface of the connecting portion 15. ing. The amount of rotation of the turntable 21 is detected by relative movement of a later-described rotation amount detection unit 51 (FIG. 11) with respect to the arcuate external gear 20.

  As shown in FIG. 1, the turntable 21 is sandwiched between the right base 11 </ b> A and the left base 11 </ b> B, carries a member to be cut on the upper surface, and serves as a center of rotation. And a neck base portion 23 that extends in the forward direction and is located above the arc portion 16. The upper surfaces of the circular base portion 22 and the neck base portion 23 are located on substantially the same plane as the upper surface of the base 11. On the upper surface of the circular base portion 22 and the neck base portion 23, an arc-shaped concave portion 24 having an opening of a substantially spindle shape and a bottom surface recessed in an arc shape matching the circumference of the circular saw blade 123 is formed. The opening of the arcuate recess 24 is covered with a cutting groove plate 25. A cutting groove 25 a into which the circular saw blade 123 is inserted when the cutting portion 4 is swung is formed at the approximate center of the cutting groove plate 25.

  In addition, a battery box 132 (FIG. 6) that constantly supplies power to a control device 141 and the like to be described later is disposed at a position on the left side of the cutting groove 25a in the arc-shaped recess 24.

  As shown in FIGS. 6 and 7, a rotating shaft portion 28 is provided at the center position of the circular base portion 22 below the bottom surface of the arc-shaped concave portion 24. The rotation shaft portion 28 is inserted into the space in the rotation support portion 19 of the base 11, and a bolt 32 is inserted into a hole that penetrates the rotation shaft portion 28 and the rotation support portion 19 in series. 11 is fixed to be rotatable. Thereby, the turntable 21 can be rotated on the base 11 without being detached from the base 11.

  A convex portion 23A (FIG. 1) protruding from the side surface is provided on the left side surface of the neck base portion 23, and contacts the side surface of the left base 11B when the turntable 21 is rotated. A similar convex portion is also provided on the right side surface of the neck base portion 23 and comes into contact with the right base 11A. Therefore, the turntable 21 can be rotated with respect to the base 11 within a range where these convex portions come into contact with the side surface of the base 11.

  On the front side of the neck portion 23, a rotation fine adjustment unit 41 (FIG. 1) for finely adjusting the rotation position of the turntable 21 is provided. As shown in FIGS. 7 and 8, a pin fixing portion 30 and a screw fixing portion 31 projecting from the lower surface are provided on the lower surface of the turntable 21, and below the pin fixing portion 30 and the screw fixing portion 31, A rotation amount detection unit 51 (FIG. 8) for detecting the rotation amount of the turntable 21 in relation to the arcuate external gear 20 of the base 11 is provided.

  Further, as shown in FIGS. 5 and 6, a lock lever 26 fixed to the lower surface of the turntable 21 with a screw 27 is disposed on the lower side of the arc portion 16 in front of the rotation shaft portion 28. ing. The lock lever 26 is extended to a front end position of a rotation fine adjustment unit 41 (FIG. 8), which will be described later, and is bent upward along the front end side surface of the rotation fine adjustment unit 41. A pressing portion 26A is configured. Further, a convex portion 26B that protrudes upward is provided at a position facing the lower side surface of the circular arc portion 16 of the lock lever 26, and an engagement formed on the lower portion of the side surface of the convex portion 26B and the circular arc portion 16 is provided. The stop groove 16a can be engaged. Therefore, the turntable 21 that rotates including the lock lever 26 is fixed when the projection 26B and the locking groove 16a are locked at a predetermined angle where the locking groove 16a is provided.

  As shown in FIGS. 9 and 10, the lock fine adjustment unit 41 has a lock lever fixing pin 49 disposed on the frame 42 that is an outer shell of the rotation fine adjustment unit 41 so as to be slidable left and right. . In the vicinity of the tip of the lock lever fixing pin 49, a fixing groove 49a (FIG. 25) is formed over the outer periphery. Further, the lock lever fixing pin 49 is provided with a spring 50 to press the lock lever fixing pin 49 rightward. A tongue piece 26C extends upward from the left side of the lock lever 26 at a position overlapping the sliding position of the lock lever fixing pin 49 of the lock lever 26. Normally, the fixing pin 49 is held in the right position by the spring 50, and the tongue piece 26C and the fixing groove 49a are not engaged in this holding state. In this case, the convex portion 26B can be locked with the locking groove 16a. When the lock lever 26 is pushed down and the lock lever 26 is returned to the original position while the lock lever fixing pin 49 is pressed leftward, the tip of the lock lever fixing pin 49 and the tongue piece 26C are engaged. Thereby, the convex part 26B and the locking groove 16a cannot be locked, and the rotation angle of the turntable 21 can be set to an arbitrary angle.

  As shown in FIGS. 8 to 10, the rotation fine adjustment portion 41 penetrates in the front-rear direction through the opening 42 a of the frame 42 in addition to the lock lever fixing pin 49 and the like, and the arc portion of the base 11. 16 is provided with a fixed handle 43 whose tip can abut on the outer peripheral surface, and an adjustment screw 44 that is substantially orthogonal to the fixed handle 43 and penetrates the hole of the frame 42. The shaft 43A in the vicinity of the position orthogonal to the adjustment screw 44 of the fixed handle 43 is threaded, and the shaft 44A in the vicinity of the position orthogonal to the fixed handle 43 of the adjustment screw 44 is also threaded. The pieces 45 related to the fixed handle 43 and the adjusting screw 44 are provided with two screw holes that extend in a substantially orthogonal direction and do not overlap each other. Therefore, the adjusting screw 44 is screwed with the piece 45 through the screw hole, and the fixed handle 43 is screwed with the piece 45 through another screw hole. Therefore, the fixed handle 43 and the adjustment screw 44 are integrated perpendicularly with the piece 45 interposed therebetween.

  As shown in FIG. 9, the piece 45 is disposed so as to be movable between a front wall 47 and a rear wall 48 extending from the frame 42. Between the piece 45 and the front wall 47, springs 46 arranged on the left and right are arranged, and the piece 45 is pressed in the rearward direction so as to contact the rear wall 48. When the fixed handle 43 is screwed, the shaft 43 </ b> A moves backward with respect to the piece 45 by screwing with the piece 45. However, after the fixed handle 43 is screwed and the tip end abuts on the outer peripheral surface of the arc portion 16, the fixed handle 43 can not move further forward, so that the fixed handle 43 and the piece 45 move relative to each other. The piece 45 moves forward. The adjustment screw 44 is provided at both ends so that the knobs 44B sandwich the frame 42, and does not move to the left and right with respect to the frame 42. Since the adjustment screw 44 and the piece 45 are screwed together, the piece 45 and the shaft 44 </ b> A move relatively to the left and right by rotating the adjustment screw 44. However, since the adjustment screw 44 does not move in the left-right direction with respect to the frame 42, the piece 45 moves left and right within the frame 42. The turntable 21 is fixed at a predetermined position by the engagement between the convex portion 26B and the locking groove 16a, but the angle at which the locking groove 116a such as 0 °, 15 °, etc. is formed particularly when fine adjustment is performed. In the vicinity, the protrusion 26B and the locking groove 16a cannot be locked as described above.

  As shown in FIGS. 12 and 13, the rotation amount detection unit 51 includes a first gear 56, a second gear 58, a detected portion 60, and an optical sensor 62, which are speed increasing portions, in a substantially sealed housing 52. Have. The first gear 56 projects from the housing 52 to the outside and meshes with the arcuate external gear 20 to become a rotated portion, and the second gear 58 meshes with the second gear 58 having a larger diameter than the first gear 56A. A gear 56B is integrally formed, and is fixed in the housing 52 so as to be rotatable by a shaft 57. The second gear 58 integrally includes a third gear 58A that meshes with the second gear 56B and a fourth gear 58B that has a larger diameter than the third gear 58A and meshes with the detected portion 60, and can rotate around the shaft 59. It is fixed in the housing 52. The detected portion 60 integrally includes a fifth gear 60A meshing with the fourth gear 58B and a substantially disc-shaped detected element 60B, and is fixed inside the housing 52 so as to be rotatable about a shaft 61. The detected element 60B is formed with 100 slits 60c radially. The detected element 60B is held between a pair of arms extending from the optical sensor 62. The arm 60 detects the slit 60c and measures the rotation angle of the detected element 60B.

  The optical sensor 62 includes two light emitting units (not shown) and two light receiving units (not shown), and the two light emitting units are arranged to face the two light receiving units, respectively. A detected element 60B as a detected element is disposed at a position between two light emitting units (not shown) and two light receiving units (not shown). The light emitted from the part passes through the slit 60c formed in the detected element 60B and is received by two opposing light receiving parts, or the detected element 60B between the slits 60c and 60c adjacent to each other. It is configured so as to be blocked by the portion and not received by the two light receiving portions facing each other.

  Two light emitting units and a light receiving unit (not shown) are in a positional relationship shifted from each other in the circumferential direction of the detected element 60B. The deviation of two light emitting units (not shown) is such that the pulses detected by the optical sensor 62 are 90 ° out of phase with each other as the detected element 60B rotates. Since two types of pulses that are 90 ° out of phase with each other are detected, it is determined whether the rotation direction of the detected element 60B is clockwise or counterclockwise, that is, whether the rotation direction of the turntable 21 is clockwise or counterclockwise. Can be detected. The speed increasing ratio of the gear in the rotation amount detection unit 51 is set so that the detected portion 60 rotates 72 ° while the turntable 21 rotates 1 °.

  As shown in FIG. 13, the rotation amount detection unit 51 has a pin hole 53 and a screw fixing portion 54 formed in a housing 52 near the first gear 56. The screw fixing portion 54 has a C-shaped hole that is partially opened. As shown in FIG. 14, even when the screw 64 is attached to the screw fixing portion 31, it can be separated from the screw 64 as long as it is not tightened by the screw 64. Therefore, the rotation amount detection unit 51 can be rotated with respect to the turntable 21 by the pin 63 through the pin hole 53. Further, the rotation amount detection unit 51 can be fixed to the turntable 21 so as not to be rotatable at a desired angle by a screw 64 as a unit fixing portion. Since the screw 64 has a spring 64A between the screw 64 and the screw fixing portion 31, the screw 64 always receives a reaction force, so that the screw 64 does not come off due to vibration or the like even when the screw 64 is not tightened.

  As shown in FIG. 11, in a state where the rotation amount detection unit 51 is attached to the turntable 21, a unit pressing portion is provided between the contact plate 21A protruding from the lower surface of the turntable 21 and the contact portion 52A of the housing 52. A spring 55 is provided. With the pressing force of the spring 55, the rotation amount detection unit 51 is pressed against the arcuate external gear 20 with the first gear 56A as a contact portion. Therefore, the play of the first gear 56A with respect to the arcuate external gear 20 is unlikely to occur, and the rotation of the turntable 21 relative to the base 11 can be accurately detected.

  As shown in FIGS. 6 and 7, the support portion 3 includes a rotation support portion 71 provided on the rear end side of the turntable 21 and a rotation portion 74 that rotates with respect to the rotation support portion 71. It consists of

  As shown in FIG. 6, the rotation support portion 71 is provided on the rear end side of the turntable 21 and extends upward. As shown in FIG. 15, the rotation support portion 71 is provided with a support hole 72 that is flush with the upper surface of the turntable 21 and coaxial with the center of the cutting groove 25 a (FIG. 1). A pin-like bolt 76 on the rotating portion 74 side is inserted to connect the rotating support portion 71 and the rotating portion 74. The wall of the rotation support portion 71 that is in contact with the rotation portion 74 is formed with a recess 71a penetrating in a substantially circular shape, and an arc portion centering on the central axis of the support hole 72 is formed in the recess 71a. An arcuate internal gear 77 is fixed with a screw (not shown).

  A rotation surface 78 is formed at a position where the rotation portion 74 contacts the rotation support portion 71. A pin-shaped bolt 76 is provided in a rotation hole 75 drilled substantially at the center of the rotation surface 78. Therefore, when the rotation surface 78 comes into contact with the edge of the recess 71a on the rear surface side of the rotation support portion 71 and the rotation portion 74 rotates with respect to the rotation support portion 71, the rotation surface 78 becomes the recess 71a. It rotates while sliding against the edge.

  As shown in FIG. 16, on the right side of the rotation hole 75 of the rotation unit 74, an arc-shaped long hole 79 centering on the rotation hole 75 penetrates from the rear surface of the rotation unit 74 to the rotation surface. Is formed. In addition, a clamp hole 73 into which a clamp shaft 81 to be described later is screwed is formed at a portion of the rotation support portion 71 that faces the long hole 79. Further, on the left side of the rotation hole 75, there is provided a tilt amount detection unit 101 that detects the rotation amount of the rotation part 74 relative to the rotation support part 71 in relation to the arcuate internal gear 77, and above the rotation hole 75. Is provided with a pair of swing support arms 84 for supporting the cutting portion 4, and a swing support pin 85 (FIG. 15) for connecting the cutting portion 4 and the support portion 3 is provided between the swing support arms 84. It is done. The left swing support arm 84 is provided with an arm support portion 86 to which an arm 127 described later is attached (FIG. 1).

  The tip of the clamp shaft 81 is threaded, and is screwed into the clamp hole 73 as shown in FIG. Therefore, the rotation part 74 can rotate with respect to the rotation support part 71 only in a range in which the clamp shaft 81 can move relatively within the elongated hole 79 by the rotation of the rotation part 74. In the first embodiment, it is possible to rotate within a range of about 45 °.

  As shown in FIG. 18, the long hole edge 80 that defines the long hole 79 protrudes rearward from the rear surface of the rotating portion 74. A clamp lever 82 is provided at the rear end of the clamp shaft 81, and a spacer 83 containing a spring 83 </ b> A is provided between the clamp lever 82 and the long hole edge 80. Since the clamp shaft 81 is screwed with the rotation support portion 71, the clamp lever 82 and the spacer 83 are moved toward the rotation support portion 71 by rotating the clamp lever 82 and tightening the clamp shaft 81. A long hole edge 80, which is a part of the rotation part 74, is interposed between the spacer 83 and the rotation support part 71, so that the long hole edge 80 is interposed between the spacer 83 and the rotation support part 71. Is pinched. Accordingly, a frictional force is generated between the rotation surface 78 and the rotation support portion 71, and the rotation portion 74 is fixed to the rotation support portion 71. Further, since the clamp lever 82 is pressed backward against the rotation support portion 71 via the long hole edge 80 by the spring 83A in the spacer 83, the unexpected rotation of the clamp lever 82 is suppressed and the play is suppressed. Is possible.

  As shown in FIGS. 17 and 18, a tilting fine adjustment unit 91 is provided around the clamp shaft 81. The tilting fine adjustment unit 91 is a fine adjustment device that can finely adjust the rotation amount of the rotation unit 74 relative to the rotation support unit 71. Yes. The tilting fine adjustment unit 91 includes a fine adjustment gear 92 that is a fine adjustment unit fixed to the rotation unit 74, a fine adjustment shaft 93 that meshes with the fine adjustment gear 92, and a fine adjustment knob 94 that meshes with the fine adjustment shaft 93. Including. The fine adjustment gear 92 is a gear formed in an arc shape with the central axis of the rotation hole 75 as the center, and is fixed to the outer peripheral portion around the long hole 79 of the rotation portion 74. The fine adjustment shaft 93 is rotatably fixed to the rotation support portion 71 and extends rearward substantially in parallel with the clamp shaft 81. A first gear 93 </ b> A is provided at a position related to the fine adjustment gear 92 of the fine adjustment shaft 93 and meshes with the fine adjustment gear 92. At the rear end of the fine adjustment shaft 93, a second gear 93B having a diameter larger than that of the first gear 93A is provided. The fine adjustment knob 94 is inserted on the clamp shaft 81 and supported so as to be freely rotatable. By extrapolating the fine adjustment knob 94 to the clamp shaft 81 to be coaxial, it is possible to save space and improve the mountability of the fine adjustment portion 91 as a whole.

  A third gear 94A is integrally and coaxially provided in front of the fine adjustment knob 94 and meshes with the second gear 93B. Since the fine adjustment gear 92 and the fine adjustment knob 94 are always meshed, the fine adjustment knob 94 is always in a rotating state when the cutting portion 4 is tilted and the rotation portion 74 is rotated.

  As shown in FIGS. 19 and 20, the tilt amount detection unit 101 includes a first gear 106, a second gear 108, a detected portion 110, and an optical sensor 112 that are speed increasing portions in a substantially sealed housing 102. Have. The first gear 106 protrudes from the housing 102 to the outside, passes through a hole drilled in the rotating portion 74, meshes with the arcuate internal gear 77, and serves as a rotated portion. A second gear 106B having a larger diameter than the gear 106A and meshing with the second gear 108 is integrally formed, and is fixed in the housing 102 so as to be rotatable by a shaft 107. The second gear 108 has a third gear 108A that meshes with the second gear 106B and a fourth gear 108B that has a larger diameter than the third gear 108A and meshes with the detected portion 110, and can rotate around the shaft 109. The housing 102 is fixed. The detected portion 110 integrally includes a fifth gear 110A meshing with the fourth gear 108B and a substantially disc-shaped detected element 110B, and is fixed in the housing 102 so as to be rotatable about a shaft 111. The detected element 110B has 100 slits 110c formed radially as the detected element. The detected element 110 </ b> B is held between a pair of arms extending from the optical sensor 112. The arm 110 detects 110c and measures the rotation angle of the detected element 110B.

  The optical sensor 112 includes two light emitting units (not shown) and two light receiving units (not shown), and the two light emitting units are arranged to face the two light receiving units, respectively. A detected element 110B is arranged at a position between two light emitting parts (not shown) and two light receiving parts (not shown), and emitted from the two light emitting parts as the detected element 110B rotates. Light passes through the slit 110c formed in the detected element 60B and is received by two opposing light receiving portions, or is blocked by the portion of the detected element 110B between the adjacent slits 110c and 110c. The two light receiving portions facing each other are configured not to receive light.

  Two light emitting units and a light receiving unit (not shown) are in a positional relationship shifted from each other in the circumferential direction of the detected element 110B. The deviation between two light emitting units (not shown) is such that the pulses detected by the optical sensor 112 are 90 ° out of phase with each other as the detected element 110B rotates. Since two types of pulses whose phases are shifted from each other by 90 ° are detected, it is determined whether the rotation direction of the detected element 110B is clockwise or counterclockwise, that is, whether the rotation direction of the cutting portion 4 is clockwise or counterclockwise. Can be detected. The speed increasing ratio of the gear in the rotation amount detection unit 101 is set so that the detected portion 110 rotates 72 ° while the rotation portion 74 rotates 1 °.

  Further, as shown in FIG. 19, the rotation amount detection unit 101 has a pin hole 103 and a screw fixing portion 104 formed in a housing 102 near the first gear 106. Since the screw fixing portion 104 is a C-shaped hole that is partially open, the screw 114 is not tightened by the screw 113 even when the screw 114 is attached to the rotating portion 74 as shown in FIG. As long as it can be separated from the screw 114. Therefore, the rotation amount detection unit 101 can be rotated with respect to the rotation unit 74 by the pin 113 through the pin hole 103. It is also possible to fix the rotation amount detection unit 101 to the rotation unit 74 at a desired angle so as not to rotate by the screw 114 which is a unit fixing unit. Since the screw 114 has a spring 114A between the screw 114 and the rotating portion 74, the screw 114 always receives a reaction force, so that the screw 114 does not come off even when the screw 64 is not tightened. As shown in FIG. 19, a spring 105 as a unit pressing portion is provided between the edge of the rotation hole 75 and the contact portion 102 </ b> A of the frame 102 with the tilt amount detection unit 101 attached to the rotation portion 74. It is done. With the pressing force by the spring, the tilt amount detection unit 101 is pressed against the arcuate internal gear 77 with the first gear 106A as a contact portion. Therefore, the play of the first gear 106 </ b> A with respect to the arcuate internal gear 77 is unlikely to occur, and the rotation of the rotation unit 74 with respect to the rotation support unit 71 can be accurately detected.

  When the tilt amount detection unit 101 is attached, the attachment is difficult if the first gear 106A is pressed and is in a position where it can mesh with the arcuate internal gear 77. Therefore, in this case, as shown in FIG. 21, the tilt amount detection unit 101 may be fixed and attached with a screw 114 at a position where the spring 105 is contracted. Then, after the tilt amount detection unit 101 is attached, the screw 114 is loosened, and the tilt amount detection unit 101 is rotated by the spring 105 so that the first gear 106A and the arcuate internal gear 77 are engaged.

  As shown in FIG. 1, the cutting unit 4 has a frame 121 connected to a swing support arm 84 by a swing support pin 85. A spring (not shown) is loaded between the frame 121 and the swinging support arm 84 to lift the frame 121 upward. Therefore, the cutting part 4 is in the uppermost position when not cut.

  A motor housing 122 containing a motor (not shown) is provided at the front end portion of the frame 121, and a handle 128 that is grasped when the cutting portion 4 is pushed down is provided on the front side of the outer periphery of the motor housing 122. A circular saw blade 123 is fixed to the rotating shaft 124 of the motor housing 122. The upper half of the circular saw blade 123 is covered with a saw blade cover 125. The lower half is covered with a safety cover 126 that can rotate along the saw blade cover 125. One end of an arm 127 serving as a rotation mechanism of the safety cover 126 is attached to the safety cover 126. The other end of the arm 127 is attached to the arm support portion 86. Near the center of the frame 121, a moving handle 129 (FIG. 2) for grasping when carrying the tabletop circular saw 1 is provided.

  As shown in FIG. 1, a digital display unit 131 is provided above the fine rotation adjustment unit 41. In the digital display unit 131, as shown in FIG. 23, the rotation angle of the turntable 21 is displayed in units of 0.2 °, and the inclination angle of the cutting unit 4 is displayed in units of 0.5 °. Therefore, it is possible to easily confirm the rotation angle and the inclination angle with high accuracy.

  Further, as shown in FIG. 24, the digital display unit 131 displays an angle based on a signal output from the microcomputer 142 serving as a control device. The microcomputer 142 is an encoder for miter that converts the signals detected by the EEPROM 143 that can be electrically rewritten, the optical sensor 62 of the rotation amount detection unit 51, and the optical sensor 112 of the tilt amount detection unit 101 to be input to the microcomputer 142. 144 and a bevel encoder 145. The microcomputer 142 is connected to a battery box 132, an AC / DC converter 146 that converts AC power into DC power, and a regulator 147 that stabilizes supplied power. The battery box 132 and the AC / DC converter 146 are also connected to the Miter encoder 144, the Bevel encoder 145, and the digital display unit 131 to supply power. The power supply from the battery box 132 and the power supply from the main power supply via the AC / DC converter 146 are supplied from the battery box 132 when the main power supply is OFF, and from the main power supply when the main power supply is ON. Is controlled by the microcomputer 142 so as to be supplied. The power supplied from the battery box 132 is not supplied as power for a motor (not shown), but is supplied only to power related to control and measurement of the microcomputer 142, the Miter encoder 144, the Bevel encoder 145, and the like. Is done.

  In addition, a miter reset switch 148 that resets the rotation angle, a bevel reset switch 149 that resets the tilt angle, and a backlight switch 150 that lights the backlight of the digital display unit 131 are connected to the microcomputer 142. In addition, calculation results of outputs from the respective optical sensors 62 and 112 by the microcomputer 142 are displayed on the digital display unit 131.

  Hereinafter, the operation when cutting the member to be cut by the tabletop circular saw 1 will be described. When cutting the member to be cut by the tabletop circular saw 1, the member to be cut is brought into contact with the contact surface of the fence 12 and carried on the upper surface of the base 11. After that, the cutting part 4 is pulled down by the handle 128 to cut the member to be cut. For example, when the member to be cut is cut obliquely with respect to the contact surface of the fence 12 or cut obliquely with respect to the upper surface of the base 11. You may want to In this case, cutting is performed according to the following procedure.

  When the member to be cut is to be cut obliquely with respect to the contact surface of the fence 12, the turntable 21 is rotated. Since the cutting part 4 is provided on the turntable 21, it rotates together with the turntable 21. Since the fence 12 is fixed to the base 11, the circular saw blade 123 of the cutting portion 4 is cut obliquely with respect to the member to be cut as viewed from above the member to be cut (hereinafter, this cut state is referred to as “cut”). Defined as angle cut).

  When performing the angle cutting, when the cutting angle of the member to be cut is set to an angle determined by the engagement between the locking groove 16a and the convex portion 26B, the turntable 21 is in a state where the lock lever 26 is not pushed down. Rotate. Then, at a position where the convex portion 26B is engaged with the locking groove 16a of a desired angle, the fixed handle 43 is tightened until it does not rotate, and the tip of the fixed handle 43 is pressed against the arc portion 16 of the base 11 to thereby turn the turntable 21. Fix to the base 11. In this case, since the rotation angle of the turntable 21 with respect to the base 11 is accurately determined by the engagement between the locking groove 16a and the convex portion 26B, it is not particularly necessary to finely adjust the rotation angle.

  When the cutting angle of the member to be cut is an arbitrary angle, the pressing portion 26A of the lock lever 26 is pushed down, and the lock lever fixing pin 49 is pushed into the frame 42 as shown in FIG. The piece 26C is hooked on the fixing groove 49a. Thereby, even if the convex part 26B exists in the position of the latching groove 16a, it becomes possible to set to arbitrary angles, without engaging with the latching groove 16a. After the tongue 26C is hooked on the fixing groove 49a, the turntable 21 is rotated to an arbitrary angle. Since the table-top circular saw 1 according to the present embodiment displays the rotation angle up to 0.2 ° unit, the turntable 21 is rotated as it is by holding the fixed handle 43 and the like, so that an arbitrary angle is accurately set. It is not easy to do. Therefore, after rotating to the vicinity of an arbitrary angle, fine adjustment is performed to accurately set the arbitrary angle.

  Specifically, as shown in FIG. 26, the rotation fine adjustment portion 41 provided on the turntable 21 is disposed near an arbitrary angle with respect to the arc portion 16 provided on the base 11. In this state, the distal end of the fixed handle 43 and the outer periphery of the arc portion 16 are separated from each other, and the piece 45 is in a position where it abuts on the rear wall 48 which is the open position by the biasing force of the spring 45.

  Next, as shown in FIG. 27, the fixed handle 43 is turned to bring the tip into contact with the circular arc portion 16, and the piece 45 is separated from the rear wall 48 by the screw reciprocating movement of the screw and the screw hole. Place in position. At this position, the piece 45 and the front wall 47 are separated from each other, and the spring 46 is interposed. Therefore, due to the reaction force of the spring, the fixed handle 43 that is screwed with the piece 45 has an arc portion. 16 is pressed. In this state, the positional relationship among the fixed handle 43, the piece 45, and the arc portion 16 is fixed. However, since the piece 45 is not fixed to the frame 42 by direct screwing or the like and is only supported in the frame 42 by the spring 46, as shown in FIG. By rotating the adjusting screw 44, the relative position of the piece 45 with respect to the frame 42, that is, the frame with respect to the fixed handle 43 and the piece 45 that has become unrotatable by the tip of the fixed handle 43 coming into contact with the side surface of the arc portion 16. It is possible to finely adjust the position of 42 in the rotational direction. At this time, the finely adjustable range is within the range of the opening 42a of the frame 42 with respect to the shaft 43A of the fixed handle 43 as shown in FIG. Range.

  Further, by rotating the turntable 21, the rotation amount detection unit 51 rotates with respect to the arcuate external gear 20, and this rotation amount becomes the rotation amount of the first gear 56 having the first gear 56A. The rotation angle related to the rotation amount of the first gear 56 is increased by the second gear 58 and the detected portion 60, and the detected portion 60 rotates 72 ° when the turntable 21 rotates by 1 °. . Since the detected element 60B is formed with 100 slits per round, there are 20 slits between 72 °, and it is possible to detect the rotation of the turntable 21 at least 0.05 °. Further, in the tabletop circular saw 1, chips are generated during cutting. However, since the first gear 56, the optical sensor 62, and the like are installed in the housing 52 and the housing 52 has a substantially sealed structure, It is possible to detect the amount of rotation of the turntable 21 with high accuracy without any chips or the like entering. Therefore, when performing fine adjustment, it is possible to accurately adjust to a predetermined angle by observing the rotation angle display of the digital display unit 131.

  After finely adjusting the position of the turntable 21 to an arbitrary angle precisely, the fixed handle 43 is further tightened. As a result, the spring 46 is compressed, and the piece 45 moves to a position where it abuts on the front wall 47 which is the main fixing position, as shown in FIG. In this state, the piece 45 is pressed against the front wall 47 extending from the frame 42 and cannot move. Therefore, even if the adjusting screw 44 is rotated, the relative position change between the frame 42 and the piece 45 is changed. Therefore, the positional deviation of the frame 42 with respect to the arc portion 16 integrated with the piece 45 is suppressed. Therefore, it is possible to prevent the shift of the turntable 21 connected to the frame 42 with respect to the base 11 connected to the arc portion 16. Therefore, even when the angle is cut at an arbitrary angle, it is possible to quickly set an accurate angle and cut the member to be cut.

  Next, when it is desired to cut the member to be cut obliquely with respect to the contact surface of the base 11, the cutting portion 4 is tilted as shown in FIG. Since the cutting unit 4 is supported by the rotation unit 74, the clamp shaft 81 is loosened and the rotation surface 78 is rotated so that the rotation unit 74 can be rotated with respect to the rotation support unit 71. The contact state with the support part 71 is released. Thereby, the cutting | disconnection part 4 will be in a tilting state with dead weight. In this state, the circular saw blade 123 of the cutting portion 4 is cut obliquely with respect to the member to be cut as viewed from the front of the member to be cut (hereinafter, this cutting state is defined as inclined cutting).

  In the inclination cutting, when the member to be cut is cut at an arbitrary inclination angle, the cutting portion 4 is held manually in advance so as to have an arbitrary inclination angle (FIG. 30). In this state, the fine adjustment knob 94 is rotated to gradually rotate the rotating unit 74.

  Further, by rotating the rotation unit 74, the tilt amount detection unit 101 rotates with respect to the arcuate internal gear 77, and this rotation amount becomes the rotation amount of the first gear 106 having the first gear 106A. . The rotation angle related to the rotation amount of the first gear 106 is increased by the second gear 108 and the detected portion 110, and the detected portion 110 rotates 72 ° when the rotating portion 74 rotates 1 °. Become. Since the detected element 110B is formed with 100 slits per round, there are 20 slits between 72 °, and it is possible to detect the rotation of the rotating portion 74 by at least 0.05 °. Further, in the tabletop circular saw 1, chips are generated at the time of cutting. However, since the first gear 106, the optical sensor 112, and the like are installed in the housing 102 and the housing 102 has a substantially sealed structure, It is possible to detect the amount of rotation of the rotation unit 74 with high accuracy without any chips or the like entering. Therefore, when performing fine adjustment, it is possible to accurately adjust to a predetermined angle by observing the rotation angle display of the digital display unit 131. The clamp shaft 82 is rotated by the clamp lever 82 after the angle is accurately adjusted, and the rotating portion 74 is fixed to the rotating support portion 71. Thereby, the cutting part 4 can be accurately fixed at an arbitrary angle, and the member to be cut can be cut at an accurate angle even when the inclined cutting is performed at an arbitrary angle.

  Hereinafter, the control related to the angle display on the digital display unit 131 when the angle cut and the angle cut are performed will be described. Since the table-top circular saw 1 is provided with the battery box 132, after the power is turned on by the battery box 132, the rotation angle and the inclination angle can always be detected.

  First, when a battery is mounted in the battery box 132, the control of FIG. 31 starts. After starting, the stored values in the RAM of the rotation angle and the tilt angle are set to 0 ° in S01. This RAM is a RAM (not shown) built in the microcomputer 142. Then, the process proceeds to S02, and the count value of the optical pulse at the optical sensor 62 and the optical sensor 112 is set to zero.

  In step S03, the microcomputer 142 detects whether an AC power source is connected. If the connection of the AC power supply is not confirmed here, the process proceeds to S07, the angle display is stopped, and if the backlight switch 150 is pressed and the backlight is displayed, this is also turned off and the process proceeds to S08. If the connection of the AC power source is confirmed, the process proceeds to S04, a predetermined angle (0 ° described above) is displayed, and the process proceeds to S05. In S05, it is determined whether or not the backlight switch 150 is pressed. If the backlight switch 150 is pressed, the process proceeds to S06, and after the backlight is turned on, the process proceeds to S08. If the backlight switch 150 is not pressed, the process proceeds to S08.

In S08, the presence / absence of an optical pulse of the optical sensor 112 is detected. Here, when the light pulse is not detected (S08: No), the detected part 110 in which the slit 110c is formed is not rotating, that is, the rotating part 71 is not rotated and the cutting part 4 is tilted. Therefore, the flow related to tilting is omitted, and the process proceeds to S17 which is the flow related to rotation. If an optical pulse is detected (S08: Yes), the process proceeds to S09.
In S09, the direction of tilting of the cutting part 4 is confirmed. When the table circular saw 1 is viewed from the front, when the cutting part 4 is tilted to the left side, that is, when the turning part 74 is turned counterclockwise with respect to the turning support part 71, the process proceeds to S11 and the turning amount is increased. And the microcomputer 142 calculates the angle displayed on the digital display unit 131 in S12. When the table-shaped circular saw 1 is viewed from the front, when the cutting part 4 rises to the right side, that is, when the turning part 74 turns clockwise with respect to the turning support part 71, the process proceeds to S10 and the amount of turning is reached. The number of pulses is subtracted, the process proceeds to S12, and the angle displayed on the digital display unit 131 is calculated by the microcomputer 142. After calculating the display angle in S12, the process proceeds to S13 and the display angle is stored in the RAM.

  Next, proceeding to S14, it is determined whether or not the Bevel reset switch 149 has been pressed. When the angle set up to S13 is set to 0 °, the bevel reset switch 149 is pressed. Here, when the bevel reset switch 149 is not pressed (S14: No), the process proceeds to S17 as it is, and the detection of the rotation angle of the turntable 21 is started. If the bevel reset switch 149 has been pressed (S14: Yes), the process proceeds to S15, the optical pulse count is reset to 0, the process proceeds to S16, and the value stored in the RAM is cleared. 0 °. Then, the process proceeds to S17.

  After S17, the rotation angle of the turntable 21 is detected. First, in S17, the presence or absence of a light pulse of the light sensor 62 is detected. Here, when the light pulse is not detected (S17: No), the detected portion 60 in which the slit 60c is formed is not rotated, that is, the turntable 21 is not rotated. The flow relating to the rotation is omitted, and the process returns to S03. When the light pulse is detected (S17: Yes), the process proceeds to S18.

  Next, the direction of rotation of the turntable 21 is confirmed in S18. When the turntable 21 is rotated counterclockwise when the tabletop circular saw 1 is viewed from above, the process proceeds to S20, the number of pulses corresponding to the rotation amount is subtracted, and the process proceeds to S21 to be displayed on the digital display unit 131. The microcomputer 142 calculates the angle. When the turntable 21 is rotated clockwise when the tabletop circular saw 1 is viewed from above, the process proceeds to S19, the number of pulses corresponding to the rotation amount is added, and the process proceeds to S21 to determine the angle displayed on the digital display unit 131. Calculation is performed by the microcomputer 142. After calculating the display angle in S21, the process proceeds to S22 and the display angle is stored in the RAM.

  Next, in S23, it is determined whether or not the Miter reset switch 148 has been pressed. When the angle set up to S22 is set to 0 °, the Miter reset switch 148 is pressed. If the Miter reset switch 148 is not pressed (S23: No), the process returns to S03 as it is and the above flow is repeated again. If the Miter reset switch 148 is pressed (S23: Yes), the process proceeds to S24, the optical pulse count is reset to 0, the process proceeds to S25, and the value stored in the RAM is cleared. 0 °. Then, the process returns to S03, and the flow is repeated in the same manner.

  In the above flow, the steps (S17 to S25) for calculating the rotation angle may be performed prior to the steps (S08 to S16) for calculating the tilt angle, and the multitask processing is performed. For example, the series of steps (S08 to S16) may be processed as if they were performed simultaneously with the series of steps (S17 to S25).

  Since the above-described series of flows is always performed as long as power is supplied from the battery box 132, the rotation angle and cutting of the turntable 21 are always performed even when the AC power source as the main power source is not connected. The inclination angle of the unit 4 can be grasped, and when the AC power supply is connected, it can be used without particularly adjusting the inclination angle and the rotation angle.

  Next, a tabletop circular saw according to the second embodiment will be described with reference to FIGS. In the tabletop circular saw 1 according to the second embodiment, when the turntable 21 is rotated and becomes within a specific rotation angle range including a specific rotation angle which will be described later, the microcomputer 142 sets the specific rotation angle. Is different from the desktop circular saw according to the first embodiment in that it is displayed on the digital display unit 131.

  In addition, when the circular saw blade 123 is tilted and falls within a specific tilt angle range including a specific tilt angle described later, the microcomputer 142 causes the digital display unit 131 to display the specific tilt angle. It is different from the tabletop circular saw 1 according to the embodiment. About points other than these, it is the same as the desktop circular saw 1 by 1st Embodiment. The microcomputer 142 corresponds to a control unit, the rotation amount detection unit 51 corresponds to a rotation angle detection device, and the tilt amount detection unit 101 corresponds to a tilt angle detection device.

  More specifically, the main configuration of the tabletop circular saw is the same as that of the tabletop circular saw according to the first embodiment, and includes a rotation amount detection unit 51 as shown in FIGS. 12 and 13 to detect the rotation amount. The substantially disc-shaped detected element 60B provided coaxially with the fifth gear 60A of the unit 51 so as to rotate integrally therewith is an arcuate external gear 20 that rotates integrally with the turntable 21 as the turntable 21 rotates. Drive coupled. As the turntable 21 rotates, the detected element 60B rotates in the same manner as the tabletop circular saw according to the first embodiment.

  The optical sensor 62 that detects the rotation of the turntable 21 by detecting the rotation of the detected element 60B includes two light emitting units (not shown) and two light receiving units (not shown). The two light receiving portions are respectively arranged to face each other. A detected element 60B as a detected element is disposed at a position between two light emitting units (not shown) and two light receiving units (not shown). The light emitted from the part passes through the slit formed in the detected element 60B and is received by two opposing light receiving parts, or is blocked by the part of the detected element 60B between the slits adjacent to each other. In other words, it is configured such that it is not received by two opposing light receiving sections.

  Two light emitting units and a light receiving unit (not shown) are in a positional relationship shifted from each other in the circumferential direction of the detected element 60B. The deviation between the two light emitting units (not shown) is such that the pulses detected by the microcomputer 142 with the rotation of the detected element 60B are 90 ° out of phase with each other as shown in FIG. In FIG. 47, the pulse detected by one light receiving unit (not shown) is pulse A, and the pulse detected by the other light receiving unit (not shown) is pulse B.

  In this way, since two types of pulses A and B whose phases are shifted by 90 ° are detected, the rotation direction of the detected element 60B is clockwise or counterclockwise, that is, the rotation direction of the turntable 21 is clockwise. Direction or counterclockwise direction can be detected.

  More specifically, for example, assuming that the pulse high shown in FIG. 46 is 1 and low is 0, and the current pulse A is 0 and pulse B is 0, then pulse A is 1 and pulse B Is 0, it can be determined that the turntable 21 is rotating in the clockwise direction, that is, in the right direction in FIG. On the contrary, if the current pulse A is 0 and the pulse B is 0, then if the pulse A is 0 and the pulse B is 1, the counterclockwise direction, that is, the left direction in FIG. It can be determined that the turntable 21 is rotating.

  Further, the turntable 21 is configured to generate 20 pulses of A and B each time it is turned by 1 °. For this reason, as shown in FIG. 46, every time the turntable 21 rotates by 0.05 °, one pulse of A and B is generated. Therefore, for example, when the turntable 21 is rotated from a state where the rotation angle is 0 ° to a position of 45 °, 900 pulses of A and B are generated. This 0.05 ° angle corresponds to a predetermined unit rotation angle.

  Similar to the first embodiment, the microcomputer 142 displays the rotation angle of the turntable 21 in units of 0.2 °. In other words, every time the turntable 21 rotates 0.2 ° clockwise or counterclockwise, the rotation angle of the turntable 21 displayed on the digital display unit 131 is increased or decreased by 0.2 °. It is configured to be updated and displayed. The angle of 0.2 ° is equal to four times that is an integral multiple of 0.05 °, which is a predetermined unit rotation angle, and corresponds to a predetermined display unit rotation angle.

  Here, it is assumed that 0 ° is displayed on the digital display unit 131 and the rotation angle of the turntable 21 is just 0 °. Even if the microcomputer 142 detects a pulse indicating that the turntable 21 is rotated rightward as shown in FIG. 46 and is rotated to a position of 0.05 °, it is displayed on the digital display unit 131. The value of the rotation angle remains 0 °. When the microcomputer 142 detects a pulse indicating that it has further rotated and rotated to a position of 0.20 °, the microcomputer 142 is a value obtained by adding 0.2 ° to the display on the digital display unit 131. Update to 0.2 °. When the microcomputer 142 detects a pulse indicating that it has further rotated and rotated to a position of 0.30 °, the microcomputer 142 adds the display on the digital display 131 by 0.2 °. Update to a certain 0.4 °.

  Conversely, from the state in which 0.4 ° is displayed on the digital display unit 131 and the turning angle of the turntable 21 is just 0.4 °, the turntable 21 is turned counterclockwise, Even if the microcomputer 142 detects a pulse indicating that it has rotated to a position of 0.35 °, the value of the rotation angle displayed on the digital display 131 remains at 0.4 °. When the microcomputer 142 detects a pulse indicating that it further rotates and rotates 0.30 °, the microcomputer 142 is a value obtained by subtracting 0.2 ° from the display on the digital display 131. Update to °. When the microcomputer 142 detects a pulse indicating that it further rotates and rotates 0.20 °, the microcomputer 142 reduces the display on the digital display 131 to 0 °, which is a value obtained by subtracting 0.2 °. Update.

  Further, it is assumed that 14.8 ° is displayed on the digital display unit 131 and the rotation angle of the turntable 21 is just 14.8 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 is rotated clockwise, that is, rightward as shown in FIG. 47 and is rotated to a position of 14.85 °, the microcomputer 142 The digital display unit 131 displays 15.0 ° which is the specific rotation angle.

  If the microcomputer 142 detects a pulse indicating that it has further rotated from this state and has rotated by 15.15 °, the microcomputer 142 displays 15.2 ° on the digital display unit 131.

  Conversely, it is assumed that 15.2 ° is displayed on the digital display unit 131 and the turn angle of the turntable 21 is just 15.2 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 rotates counterclockwise, that is, leftward as shown in FIG. 46 and rotates to the 15.15 ° position, the microcomputer 142 Then, 15.0 ° which is the specific rotation angle is displayed on the digital display unit 131.

  When the microcomputer 142 detects a pulse indicating that it has further rotated from this state and rotated by 14.85 °, the microcomputer 142 displays 14.8 ° on the digital display unit 131.

  Similarly, it is assumed that 22.4 ° is displayed on the digital display unit 131 and the turn angle of the turntable 21 is 22.35 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 is rotated clockwise, that is, rightward as shown in FIG. 48 and rotated to a position of 22.40 °, the microcomputer 142 The digital display unit 131 displays 22.5 ° which is the specific rotation angle.

When the microcomputer 142 detects a pulse indicating that it has further rotated from this state and has rotated 22.60 °, the microcomputer 142 displays 22.6 ° on the digital display unit 131 .

  Conversely, it is assumed that 22.6 ° is displayed on the digital display 131 and the turn angle of the turntable 21 is also 22.65 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 rotates counterclockwise, that is, leftward as shown in FIG. 48 and rotates to the position of 22.60 °, the microcomputer 142 Then, the specific rotation angle of 22.5 ° is displayed on the digital display 131.

When the microcomputer 142 detects a pulse indicating that it has further rotated from this state and rotated by 22.40 °, the microcomputer 142 displays 22.4 ° on the digital display unit 131 .

Thus, when the specific rotation angle (22.50 °) does not coincide with a value corresponding to an integral multiple of 0.2 ° which is the predetermined display unit rotation angle, the rotation angle detection device detects it. When the pulse is within a specific rotation angle range (22.40 ° to 22.60 °) including the specific rotation angle (22.50 °) , the microcomputer 142 determines the specific rotation angle (22.50). °) can be displayed on the digital display 131, so that the user can recognize that the turntable 21 has been rotated to a specific rotation angle, and cut the molding material in a state of being rotated to the specific rotation angle. can do.
In this example, the display angle range (22.40 ° to 22.60 °) of the specific rotation angle (22.50 °) is four times the unit rotation angle of 0.05 °, and the rotations on both sides of the display angle range. The display angle ranges of 22.40 ° and 22.60 ° of the moving angle (22.30 ° to 22.40 °, 22.60 ° to 22.70 °) are respectively 2 with a unit rotation angle of 0.05 °. It is as a double.

  Similarly, it is assumed that 31.4 ° is displayed on the digital display unit 131 and the turn angle of the turntable 21 is 31.40 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 is rotated clockwise, that is, rightward as shown in FIG. 49 and rotated to a position of 31.45 °, the microcomputer 142 The specific rotation angle of 31.6 ° is displayed on the digital display unit 131.

  If the microcomputer 142 detects a pulse indicating that it further rotates from this state and rotates by 31.75 °, the microcomputer 142 displays 31.8 ° on the digital display unit 131.

  Conversely, it is assumed that 31.8 ° is displayed on the digital display 131 and the turn angle of the turntable 21 is 31.80 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 rotates counterclockwise, that is, leftward as shown in FIG. 49 and rotates to a position of 31.75 °, the microcomputer 142 Then, the specific rotation angle of 31.6 ° is displayed on the digital display unit 131.

  The microcomputer 142 further rotates from this state, and when the microcomputer 142 detects a pulse indicating that it has rotated 31.45 °, the microcomputer 142 displays 31.4 ° on the digital display unit 131.

  Similarly, as shown in FIG. 50, it is assumed that 35.2 ° is displayed on the digital display 131 and the turn angle of the turntable 21 is just 35.20 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 is rotated clockwise, that is, rightward as shown in FIG. 50 and rotated to a position of 35.25 °, the microcomputer 142 The digital display unit 131 displays 35.3 ° which is a specific rotation angle.

If the microcomputer 142 detects a pulse indicating that it has further rotated from this state and rotated to 35.35 °, the microcomputer 142 displays 35.4 ° on the digital display unit 131 .

  Conversely, it is assumed that 35.4 ° is displayed on the digital display 131 and the turn angle of the turntable 21 is just 35.40 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 is rotated counterclockwise, that is, leftward as shown in FIG. 47 and is rotated to a position of 35.35 °, the microcomputer 142 Then, 35.3 ° which is the specific rotation angle is displayed on the digital display unit 131.

If the microcomputer 142 detects a pulse indicating that it has further rotated from this state and rotated to 35.25 °, the microcomputer 142 displays 35.2 ° on the digital display unit 131 .

Thus, when the specific rotation angle (35.30 °) does not coincide with a value corresponding to an integral multiple of 0.2 ° which is the predetermined display unit rotation angle, the rotation angle detection device detects it. When the pulse is within a specific rotation angle range (35.25 ° to 35.35 °) including the specific rotation angle, the microcomputer 142 displays the specific rotation angle (35.30 °) on the digital display unit. Since it can be displayed on 131, the user can recognize that the turntable 21 has been rotated to a specific rotation angle, and can cut the molding material while being rotated to the specific rotation angle.
In this example, the display angle range (35.25 ° to 35.35 °) of the specific rotation angle (35.3 °) is twice the unit rotation angle 0.05 °, and the rotations on both sides thereof are the same. The display angle ranges (35.10 ° to 35.25 °, 35.35 ° to 35.50 °) of the moving angle of 35.2 ° and 35.4 ° are respectively 3 with a unit rotation angle of 0.05 °. It is as a double.

  Similarly, it is assumed that 44.8 ° is displayed on the digital display unit 131 and the rotation angle of the turntable 21 is 44.80 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 is rotated clockwise, that is, rightward as shown in FIG. 51 and is rotated to a position of 44.85 °, the microcomputer 142 The specific rotation angle of 45.0 ° is displayed on the digital display unit 131.

  The microcomputer 142 further rotates from this state, and when the microcomputer 142 detects a pulse indicating that it has rotated 45.15 °, the microcomputer 142 displays 45.2 ° on the digital display unit 131.

  Conversely, it is assumed that 45.2 ° is displayed on the digital display unit 131 and the turn angle of the turntable 21 is 45.20 °. When the microcomputer 142 detects a pulse indicating that the turntable 21 rotates counterclockwise, that is, leftward as shown in FIG. 51 and rotates to a position of 45.15 °, the microcomputer 142 Then, 45.0 ° which is the specific rotation angle is displayed on the digital display unit 131.

  If the microcomputer 142 detects a pulse indicating that it has further rotated from this state and rotated 44.85 °, the microcomputer 142 displays 44.8 ° on the digital display unit 131.

  Similarly, in the tilt amount detection unit 101, the optical sensor 112 that detects the tilt of the circular saw blade 123 by detecting the rotation of the detected element 110B includes two light emitting units (not shown) and two light receiving units (not shown). The two light emitting units are respectively disposed opposite to the two light receiving units. A detected element 110B as a detected element is arranged at a position between two light emitting units (not shown) and two light receiving units (not shown). The light emitted from the part passes through the slit formed in the detected element 110B and is received by two opposing light receiving parts, or is blocked by the part of the detected element 110B between the slits adjacent to each other. In other words, it is configured such that it is not received by two opposing light receiving sections.

  Two light emitting units (not shown) are in a positional relationship shifted from each other in the circumferential direction of the detected element 110B. The deviation between the two light emitting units (not shown) is such that the pulses detected by the microcomputer 142 with the rotation of the detected element 110B are 90 ° out of phase with each other as shown in FIG. In FIG. 48, the pulse detected by one light receiving unit (not shown) is pulse A, and the pulse detected by the other light receiving unit (not shown) is pulse B.

  Thus, since two types of pulses A and B whose phases are shifted by 90 ° are detected, the rotation direction of the detected element 110B is clockwise or counterclockwise, that is, the tilt direction of the circular saw blade 123 is Whether it is clockwise or counterclockwise can be detected. Since the circular saw blade 123 and the rotating portion 74 are connected by the configuration described in the first embodiment, the circular saw blade when the circular saw blade 123 and the rotating portion 74 are tilted. The inclination angle of 123 always coincides with the inclination angle of the rotation unit 74.

  The circular saw blade 123 is configured to generate 20 pulses of A and B each time it is tilted by 1 °. For this reason, as shown in FIG. 48, every time the circular saw blade 123 tilts by 0.05 °, one pulse of A and B is generated. Therefore, for example, when the circular saw blade 123 is tilted from a state where the tilt angle is 0 ° to a position of 45 °, 900 pulses of A and B are generated. This 0.05 ° angle corresponds to a predetermined unit tilt angle.

As in the first embodiment, the microcomputer 142 displays the inclination angle of the circular saw blade 123 in units of 0.5 °. That is, every time the circular saw blade 123 is tilted 0.5 ° counterclockwise or clockwise, the inclination angle of the circular saw blade 123 displayed on the digital display unit 131 is increased or decreased by 0.5 °. It is configured to be updated and displayed. This angle of 0.5 ° is equal to 10 times, which is an integral multiple of 0.05 °, which is a predetermined unit tilt angle, and corresponds to a predetermined display unit tilt angle.

  Here, it is assumed that 0.5 [deg.] Is displayed on the digital display 131 as shown in FIG. 52 and the inclination angle of the circular saw blade 123 is just 0.5 [deg.]. When the microcomputer 142 detects a pulse indicating that the circular saw blade 123 is tilted clockwise and tilted to a position of 0.45 °, the microcomputer 142 displays the display on the digital display unit 131 by 0.5 °. Update to 0 ° which is the subtracted value.

  Conversely, from the state where 0.5 ° is displayed on the digital display 131 and the inclination angle of the circular saw blade 123 is just 0.5 °, the circular saw blade 123 tilts counterclockwise, The value of the tilt angle displayed on the digital display 131 even when the microcomputer 142 detects a pulse indicating tilt to the positions of 0.55 °, 0.60 °, 0.65 °, and 0.70 °. Remains 0.5 °. Further, when the microcomputer 142 detects a pulse indicating tilting by 0.75 °, the microcomputer 142 updates the display on the digital display unit 131 to 1 ° which is a value obtained by adding 0.5 °. .

Further, 33.5 ° on the digital display 131 is displayed, it is assumed the tilt movement angle is also just 33.5 ° state of the circular saw blade 123. When the microcomputer 142 detects a pulse indicating that the circular saw blade 123 is tilted counterclockwise, that is, rightward as shown in FIG. 53 and tilted to a position of 33.75 °, the microcomputer 142 Show 33.9 ° is a particular inclination dynamic angle on the digital display 131.

  When the microcomputer 142 detects a pulse indicating further tilting from this state and tilting to 33.95 °, the microcomputer 142 sets the digital display unit 131 to a second integer multiple of a predetermined display unit tilt angle. The corresponding 34.0 ° is displayed.

  Conversely, it is assumed that 34.0 ° is displayed on the digital display 131 and the tilt angle of the circular saw blade 123 is just 34.00 °. When the microcomputer 142 detects a pulse indicating that the circular saw blade 123 is rotated clockwise, that is, leftward as shown in FIG. 53 and tilted to a position of 33.95 °, the microcomputer 142 The digital display unit 131 displays 33.9 °, which is a specific rotation angle.

  When the microcomputer 142 detects a pulse indicating further tilting from this state and tilting to 33.75 °, the microcomputer 142 sets the digital display unit 131 to a second integer multiple of a predetermined display unit tilt angle. The corresponding 33.5 ° is displayed.

Such specific tilt movement angle is, when they do not coincide with the value corresponding to an integer multiple of 0.5 ° which is a predetermined display unit tilting angle, pulses of tilt angle detection device detects, from 33.75 to 33 when in a particular tilt dynamic angular range including a certain inclination movement angle such .90 and 33.80 to 33.95, the microcomputer 142, it is possible to display a specific tilt movement angle on the digital display 131 , the user can the circular saw blade 123 recognizes that is tilted to a particular inclination movement angle to cut the molding material in a state of being tilted to a particular inclination movement angle.

Further, 44.5 ° on the digital display 131 is displayed, it is assumed the tilt dynamic angles 44.50 ° is exactly the state of the circular saw blade 123. When the microcomputer 142 detects a pulse indicating that the circular saw blade 123 is tilted counterclockwise, that is, rightward as shown in FIG. 54 and tilted to a position of 44.55 °, the microcomputer 142 Show 45.0 ° is a particular inclination dynamic angle on the digital display 131.

  When the microcomputer 142 detects a pulse indicating further tilting from this state and tilting to 45.45 °, the microcomputer 142 sets the digital display unit 131 to a second integral multiple of a predetermined display unit tilt angle. The corresponding 45.5 ° is displayed.

  Conversely, it is assumed that 45.5 ° is displayed on the digital display unit 131 and the tilt angle of the circular saw blade 123 is just 45.50 °. When the microcomputer 142 detects a pulse indicating that the circular saw blade 123 rotates clockwise, that is, leftward as shown in FIG. 54 and tilts to a position of 45.45 °, the microcomputer 142 45.0 ° which is a specific tilt angle is displayed on the digital display 131.

  The microcomputer 142 further tilts from this state, and when the microcomputer 142 detects a pulse indicating tilting to 44.55 °, the microcomputer 142 displays 44.5 ° on the digital display unit 131.

  FIG. 55 shows a summary of the angle display range (number of pulses) at these specific rotation angles and specific tilt angles and the angle display range (number of pulses) at the peripheral angles. As shown in FIG. 55, 0.0 °, 15.0 °, which are specific rotation angles (Miter) angles at which the stopper mechanism formed by the locking groove 16a that engages with the convex portion 26B of the lock lever 26 is set. At 22.5 °, 31.6 °, and 45.0 °, the range for displaying a specific rotation (Miter) angle is wide, and at the left and right angles, the range to be displayed is narrow, and the angle beyond that The angle display range other than 4 pulses and the specific rotation (Miter) angle is the same.

  Similarly, when the tilt angle is 0.0 °, 45.0 °, the display range of the specific tilt angle (Bevel) is wide, and the display range is narrow at the left and right angles. The angle is 10 pulses, and the angle display range other than the specific inclination (Bevel) angle is the same.

Pulse tilt angle detecting device detects is determined whether and in a particular tilt dynamic angular range including a certain inclination movement angle, a particular inclination movement to be displayed on the digital display 131 when in within the range The determination of the angle value is performed in the step of calculating the Bevel display angle (S12) in the flowchart shown in FIG. Then, the value of the specific inclination movement angle to be displayed on the digital display 131 which is determined in the step (S12) is stored in EEPROM (S13), it is displayed on the digital display (S04).

  Judgment whether or not the pulse detected by the rotation angle detection device is within a specific rotation angle range including the specific rotation angle, and a specific number of times to be displayed on the digital display unit 131 within the range. The determination of the value of the moving angle is performed in the step (S21) of calculating the Miter display angle in the flowchart shown in FIG. Then, the value of the specific rotation angle to be displayed on the digital display unit 131 determined in the step (S21) is stored in the EEPROM (S22) and displayed on the digital display unit (S04).

  The tabletop circular saw according to the present invention is not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, in the fine rotation adjustment unit 41, as a first modification, as shown in FIG. 32, a single spring 152 interposed between the piece 151 and the front wall 47 may be provided. Thereby, it is possible to reduce the number of parts constituting the rotation fine adjustment unit 41.

  As a second modification of the rotation fine adjustment portion, as shown in FIGS. 33 to 35, a meshing portion 153 having a tooth surface below is provided along the outer peripheral side of the arc portion 16. The frame 154 is provided with a support portion 154A extending downward, and the support portion 154A has a screw hole penetrating in the front-rear direction. The shaft 43A of the fixed handle 43 is screwed into a screw hole formed in the support portion 154A. By rotating the fixed handle 43, the distal end of the fixed handle 43 comes into contact with the circular arc portion 16 and is fixed to the circular arc portion 16. The position of the frame 154 can be fixed. Further, an adjustment member 155 is extrapolated to the shaft 43A across the support portion 154A. Further, a spring 156 is inserted between the front surface of the support portion 154A of the shaft 43A and the adjustment member 155 to urge the adjustment member 155 forward. A gear 155A that can mesh with the meshing portion 153 is provided at the rear end portion of the adjustment member 155, and a knob 155B that rotates the adjustment member 155 is provided at the front end portion of the adjustment member 155.

  When fine adjustment is performed using the adjustment member 155, the turntable 21 provided with the frame 154 is rotated to a vicinity of a predetermined angle, and then the adjustment member 155 is pushed rearward to engage the gear 155A and the meshing portion 153. And mesh. In this state, the knob 155B is rotated and finely adjusted to a predetermined angle. Thereafter, the fixed handle 43 is tightened to fix the position of the frame 154 with respect to the arc portion 16.

  As a first modification of the tilting fine adjustment unit, as shown in FIG. 36, a spring 164 is provided at a location where the fine adjustment knob 163 contacts the clamp lever 161. As a result, the fine adjustment knob 163 presses the rotating part 74 via the spacer 162, and friction is generated between the rotating surface 78 and the rotating support part 71. When the contact between the rotation support portion 71 and the rotation portion 74 is disengaged by opening the clamp lever 161, the cutting portion 4 tries to tilt due to its own weight, but the rotation is adjusted by the fine adjustment knob 163 and the spring 164. Since friction is generated between the moving part 74 and the rotation support part 71, it is possible to suppress tilting due to the weight of the cutting part 4. Further, rotation of fine adjustment knob 163 is suppressed by being pressed by spring 164. Since the fine adjustment knob 163 and the rotation portion 74 are connected via the fine adjustment shaft 93, the rotation of the rotation portion 74 is also suppressed by suppressing the rotation of the fine adjustment knob 163. Therefore, tilting due to the weight of the cutting part 4 is also suppressed, and fine adjustment can be performed without the need to hold the cutting part 4 at a predetermined angle with, for example, a hand during tilting fine adjustment.

  As a second modification of the tilting fine adjustment unit, as shown in FIGS. 37 and 38, a worm 166 that selectively meshes with the fine adjustment gear 92 is provided on the fine adjustment shaft 167. The fine adjustment shaft 167 is provided so as to be rotatable around the axis of the shaft support portion 169, and the shaft support portion 169 is provided on the side surface of the turntable 21 below the rotation support portion 74. . Further, a stopper 170 is provided so as to protrude on substantially the same plane as the shaft support portion 169, and the fine adjustment shaft 167 is positioned between the stopper 170 protruding from the shaft support portion 169 and the fine adjustment gear 92. .

  In the tilting fine adjustment unit according to the second modified example, the worm 166 and the fine adjustment gear 92 are dissociated as shown in FIG. When the cutting portion 4 is set to a predetermined angle, the worm 166 and the fine adjustment gear 92 are meshed after the cutting portion 4 is rotated around the predetermined angle as shown in FIG. Thereby, the cutting part 4 is held near a predetermined angle. Thereafter, the fine adjustment knob 168 is rotated, and the fine adjustment gear 92 is rotated by the worm 166 to finely adjust the rotating portion 74 so that the cutting portion 4 has a predetermined angle. Then, the clamp lever 82 is fastened and fixed.

  As another example of change of the tilting fine adjustment unit. As shown in FIG. 39, the long hole 170 may be moved about 45 ° clockwise and counterclockwise relative to the clamp shaft 81. As a result, the amount of rotation of the rotation unit 74 with respect to the rotation support unit 71 increases. It can be tilted. In addition, as shown in FIG. 40, the long hole 171 may be located at a substantially circumferential portion of the rotating portion 74.

  As a first modification of the tilt amount detection unit, as shown in FIG. 41, the rotation shaft 174 of the first gear 173, the rotation shaft 178 of the detected portion 177, and the second gear 175 of the tilt amount detection unit 171 are used. The rotating shaft 176 is arranged so as to have a substantially triangular shape with the line connecting the rotating shaft 174 and the rotating shaft 178 as the base and the rotating shaft 176 as the apex. As shown in FIGS. 41 and 42, the rotation shaft 176 is supported by a support portion 179 separated from the housing 172. The support portion 179 can be fixed to the housing 172 with a screw 180.

  In the tilt amount detection unit 171, the support portion 179 is urged toward the bottom side with the rotating shaft 174 and the rotating shaft 178, and the second gear 175, the first gear 173, and the detected portion 177 are in contact with each other. 180 is tightened, and the support portion 179 is fixed to the housing 172. As a result, no backlash occurs between the first gear 173, the second gear 175, and the detected portion 177, the rotation amount of the detected portion 177 relative to the rotation amount of the first gear 173 is made more accurate, and the optical sensor 180. It is possible to further improve the detection accuracy in Further, the support portion 179 may be pressed by a pressing portion such as a spring on the upper side of the line connecting the rotation shaft 174 and the rotation shaft 178 without being fixed by the screw 180.

  As a second modification of the tilt amount detection unit, as shown in FIG. 43, a shape in which the spring 105 is removed from the tilt amount detection unit 101 according to the first embodiment may be used. In this second modification, the tilt amount detection unit 101 is rotated about the pin 103, the first gear 106A is brought into contact with the arcuate internal gear 77, and the fixing screw 114 is tightened in a state where no play occurs. As a result, the tilt amount detection unit 101 is fixed at a position where no play occurs with respect to the arcuate internal gear 77, and it is possible to accurately detect the rotation of the rotation portion 74 relative to the rotation support portion 71. It becomes.

  As another modified example, a configuration may be provided that includes a motor with an extremely low output and low power that rotates the detected portion on the axis of the non-detecting portion. By applying a rotational axial force to the detected portion by this motor, the axial force is transmitted to the second gear and the first gear. Since the first gear meshes with the arcuate internal gear, the detected portion, the second gear, and the first gear are not rotated by the motor. However, since the axial force of rotation is always applied, there is no backlash between the gears, and the reaction force by the motor is small even when the arcuate internal gear and the tilt amount detection unit move relatively. In particular, the relative movement between the arcuate internal gear and the tilt amount detection unit is not hindered. In addition, by using a motor that stops electric power, the battery box 132 can supply electric power even when the main power supply is not connected.

  These modification examples of the tilt amount detection unit can also be applied to the rotation amount detection unit. Moreover, although the to-be-detected part is rotated by the gear in both the embodiment and the modification, the rotation is not limited to this, and the rotation may be accelerated and transmitted using, for example, a friction wheel.

  The table-top circular saw 1 according to the first embodiment has the battery box 132 and always measures the amount of rotation of the turntable 21 and the amount of tilt of the cutting part 4, but this is not restrictive. As shown, the battery box 132 may not be provided. In this case, when the turntable 21 or the like is rotated in a state where the AC power is not connected, the rotation angle cannot be calculated by the microcomputer 142, and the turn is turned on when the AC power is connected thereafter. The rotation angle of the table 21 and the inclination angle of the cutting part 4 are unknown. In this case, the digital display unit 131 may display that 0 setting is necessary. Therefore, after setting the rotation angle of the turntable 21 and the inclination angle of the cutting part 4 to 0 °, the Miter reset switch 148 and the Bevel reset switch 149 are pressed to initialize, and then the turntable 21 is rotated.

  Further, the arrangement location of the battery box 132 is not limited to the first arcuate recess 24 but may be provided, for example, at the lower surface position of the base 11.

  In addition, as shown in FIG. 45, a slide portion 186 that can move in the front-rear direction may be provided on the rotating portion 185 of the tabletop circular saw 181. The swing support arm 187 is integrally provided with a guide bar (not shown) which is a sliding member, and the guide bar (not shown) is slidably supported by a slide portion 186. Therefore, the cutting part 189 supported by the swing support arm 187 with the swing support pin 188 can move back and forth on the base 182 and the turntable 183. The rotation part 185 is supported by the rotation support part 184 so as to be rotatable at the same position as the cutting groove 191a and at the same position as the upper surface of the turntable 183. The cutting groove 191a is moved when the cutting part 189 moves back and forth. Also, the circular saw blade 192 is provided at a position where it can be accommodated. Further, the rotation support portion 184 is provided integrally with the turntable 183. Therefore, the tilting operation of the cutting part 189 and the rotating operation of the turntable 183 can be performed in the same manner as in the first embodiment.

  In the second embodiment, the specific rotation angle is 0.0 °, 15.0 °, 22.5 °, 31.6 °, 35.3 °, 45.0 ° as an example. The specific tilt angles are 0.0 °, 33.9 °, and 45.0 ° as examples, but are not limited to these three values.

  The various modifications described above can be implemented independently, or can be implemented in combination with each modification. Various modifications can be applied to the tabletop circular saw 181 for implementation.

The front perspective view of the desktop circular saw which concerns on 1st embodiment. The rear surface perspective view of the desktop circular saw which concerns on 1st embodiment. The front view of the desktop circular saw which concerns on 1st embodiment. The front view at the time of tilting of the desktop circular saw which concerns on 1st embodiment. The bottom view of the desktop circular saw which concerns on 1st embodiment. Fig. 3 is a left side cross-sectional view of the tabletop circular saw according to the first embodiment. The right side surface principal part sectional view of the tabletop circular saw concerning a first embodiment. The bottom view of the turntable of the desk circular saw which concerns on 1st embodiment. The right view of the fine adjustment part vicinity of the desktop circular saw which concerns on 1st embodiment. The lower surface perspective view of the fine adjustment part vicinity of the desktop circular saw which concerns on 1st embodiment. The lower surface detailed drawing of the turntable of the desk circular saw which concerns on 1st embodiment. Sectional detail drawing of the turntable rotation support part periphery of the desk circular saw which concerns on 1st embodiment. The plane perspective view of the rotation detection unit of the desktop circular saw which concerns on 1st embodiment. Sectional detail drawing of the pin vicinity of the rotation detection unit of the desk circular saw which concerns on 1st embodiment. Sectional drawing which shows the positional relationship of the rotation support part and rotation part of the desktop circular saw which concerns on 1st embodiment. The rear view near the rotation part of the desktop circular saw which concerns on 1st embodiment. The figure showing the relationship between the rotation part and tilting fine adjustment part of the desktop circular saw which concerns on 1st embodiment. Sectional drawing along the XVIII-XVIII line of FIG. The detailed drawing of the tilt amount detection unit periphery of the desktop circular saw according to the first embodiment. Sectional drawing along the XX-XX line of FIG. FIG. 3 is a detailed view around the tilt amount detection unit of the tabletop circular saw according to the first embodiment (spring compression state). Sectional drawing along the XXII-XXII line | wire of FIG. The top view of the digital display part of the desk circular saw which concerns on 1st embodiment. 1 is a circuit diagram of a tabletop circular saw according to a first embodiment. Sectional drawing of the XXIV-XXIV cross section of FIG. The top view which concerns on the rotation fine adjustment of the desktop circular saw which concerns on 1st embodiment. The top view (temporarily fixed state) which concerns on the rotation fine adjustment of the desktop circular saw which concerns on 1st embodiment. The top view which concerns on the rotation fine adjustment of the desktop circular saw which concerns on 1st embodiment (during fine adjustment). The top view which concerns on the rotation fine adjustment of the desktop circular saw which concerns on 1st embodiment (this fixed state). The rear view which concerns on the tilting fine adjustment of the desktop circular saw which concerns on 1st embodiment. The flowchart figure showing the control which concerns on tilting and rotation of the desktop circular saw which concerns on 1st embodiment. The top view which concerns on the 1st example of a change of the rotation fine adjustment part of the desktop circular saw which concerns on 1st embodiment. Sectional drawing which concerns on the 2nd modification of the rotation fine adjustment part of the desktop circular saw which concerns on 1st embodiment. The bottom view which concerns on the 2nd modification of the rotation fine adjustment part of the desktop circular saw which concerns on 1st embodiment. Front sectional drawing which concerns on the 2nd modification of the rotation fine adjustment part of the desk circular saw which concerns on 1st embodiment. Sectional drawing which concerns on the 1st modification of the tilting fine adjustment part of the desktop circular saw which concerns on 1st embodiment. The rear view (temporarily fixed state) which concerns on the 2nd modification of the tilting fine adjustment part of the desktop circular saw which concerns on 1st embodiment. The rear view (tilting state) which concerns on the 2nd modification of the tilting fine adjustment part of the desktop circular saw which concerns on 1st embodiment. The rear view which concerns on the other example of a change (long hole change) of the tilting fine adjustment part of the desktop circular saw which concerns on 1st embodiment. The rear view which concerns on the other example of a change (long hole position change) of the tilting fine adjustment part of the desktop circular saw which concerns on 1st embodiment. The rear view concerning the 1st modification of the inclination amount detection unit of the desk circular saw concerning a 1st embodiment. FIG. 42 is a cross-sectional view of the XLI-XLI cross section of FIG. 41. The rear view concerning the 2nd modification of the tilt amount detection unit of the desktop circular saw which concerns on 1st embodiment. The circuit diagram which does not have a battery box of a desk circular saw as a modification of 1st Embodiment. The front perspective view of the desk-top circular saw provided with the slide mechanism as a modification which concerns on 1st embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the rotation amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the rotation amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the rotation amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the rotation amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the rotation amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the rotation amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the tilt amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the tilt amount detection unit of the desk circular saw by 2nd embodiment. Schematic which shows two pulses which generate | occur | produce by the slit formed in the to-be-detected element of the tilt amount detection unit of the desk circular saw by 2nd embodiment. The schematic diagram of the pulse number which generate | occur | produces with the slit formed in the to-be-detected element of the rotation amount detection unit of the desk circular saw by 2nd embodiment, and a tilt amount detection unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tabletop circular saw 2 Base part 4 Cutting part 16a Locking groove 21 Turntable 26B Convex part 51 Rotation amount detection unit 60B Detected element 62 Optical sensor 86 Arm support part 101 Tilt amount detection unit 110B Detected element 112 Optical sensor 123 Round Saw blade 127 Arm 131 Digital display unit 141 Control device

Claims (8)

A base for supporting the workpiece,
A turntable rotatable with respect to the base supported on the base;
A cutting part for supporting the cutting blade;
A tabletop cutting machine having a support provided on the turntable and swingably supporting the cutting part above the turntable,
A rotation angle detection device that detects a rotation angle of the turntable relative to the base and generates one pulse each time the turntable rotates by a predetermined unit rotation angle;
A display unit for displaying the rotation angle of the turntable;
Control means for changing a display angle to be displayed on the display unit according to the number of pulses generated by the rotation angle detection device,
A predetermined angular position of the turntable is set as a specific rotation angle position, an angle corresponding to an integral multiple of the unit rotation angle is set as a display unit rotation angle, and the display unit rotation includes the specific rotation angle position. When the range of angles larger than the angle is set as the specific rotation angle display range,
The control means updates the display angle for each display unit rotation angle corresponding to an integral multiple of the unit rotation angle according to the number of pulses generated by the rotation angle detection device,
When the angle position of the turntable is within the specific rotation angle display range, the specific rotation angle is displayed on the display unit without updating the display angle for each display unit rotation angle. Desktop cutting machine characterized by letting 2. The tabletop cutting machine according to claim 1, wherein the control means displays a display angle on both sides of the specific rotation angle display range in a range smaller than the display unit rotation angle.   The tabletop cutting machine according to claim 1, wherein the specific rotation angle position includes a position where the rotation angle of the turntable is 0 °. When the specific rotation angle does not correspond to an integral multiple of the display unit rotation angle, and when the angular position of the turntable is within the specific rotation angle display range, the control means 4. The moving angle is displayed, and the display angles on both sides of the specific rotation angle are displayed in a range smaller than the display unit rotation angle. Tabletop cutting machine. A base portion capable of supporting a processed member;
A cutting part for supporting the cutting blade;
A tabletop cut-off note having a support portion that swingably supports the cutting portion above the base portion and is supported to be tiltable by the base portion,
A tilt angle detecting device that detects a tilt angle of the cutting blade relative to the base portion and generates one pulse each time the cutting blade tilts by a predetermined unit tilt angle;
A display unit for displaying the tilt angle of the cutting blade;
Control means for changing a display angle to be displayed on the display unit according to the number of pulses generated by the tilt angle detection device;
A predetermined tilt angle position of the cutting blade is defined as a specific tilt angle position, an angle corresponding to an integral multiple of the unit tilt angle is defined as a display unit tilt angle, and includes the specific tilt angle position and is larger than the display unit tilt angle. When the range is set as the specific tilt angle display range,
The control means updates the display angle for each display unit tilt angle corresponding to an integral multiple of the unit tilt angle according to the number of pulses generated by the tilt angle detection device,
When the angle position of the cutting blade is located within the specific tilt angle display range, the specific tilt angle is displayed on the display unit without updating the display angle for each display unit tilt angle. A tabletop cutting machine. 6. The tabletop cutting machine according to claim 5, wherein the control means displays the display angles adjacent to the specific tilt angle display range in a range smaller than the display unit tilt angle.   The tabletop cutting machine according to claim 4, wherein the specific tilt angle position includes a position where the tilt angle of the cutting blade is 0 °. The control means, when the specific rotation angle does not correspond to an integral multiple of the display unit rotation angle, when the angular position of the cutting blade is located within the specific tilt angle display range, the specific tilt angle The tabletop cutting machine according to any one of claims 5 to 7, wherein a display angle on both sides of the specific tilt angle is displayed in a range smaller than the display unit tilt angle. .

Images