JP6404138B2 - Band saw cutting machine - Google Patents

Description

  The present invention relates to a band saw cutting machine (band saw) that circulates an endless band-shaped band saw to cut a cutting material.

  Conventionally, a band saw cutting machine (band saw) that cuts a cutting material by rotating an endless band-shaped band saw is known. As this band saw, a portable band saw and a stationary band saw are known. In such a band saw cutter, a pair of saw wheels supported rotatably on the main body housing are provided. An endless band-shaped band saw is hung on the pair of saw wheels. The endless band-shaped band saw that is hung is circulated by the rotation of a pair of saw wheels. The circulating band saw is exposed so as to be cut at a cutting portion set between a pair of saw wheels. The band saw exposed at this cutting site cuts the cutting material.

JP 2014-87876 A US Pat. No. 8,867,633

  Some band saw cutters have a cover attached to a main body housing so as to cover a pair of saw wheels. The cover should be closed when used as a cutting machine, and opened when replacing the band saw. For this reason, the cover is hinge-coupled so that it can be opened and closed with respect to the main body housing. This hinge connection was set on the outside of the circulating band saw. This hinge joint location is generally provided on the side opposite to the cutting site. On the other hand, the locking hook for locking the closed state of the cover is provided on the setting side of the cutting site, which is the opposite side of the hinge connection. It is pointed out that when the locking hook is provided on the cutting site setting side in this way, the locking hook may interfere with the cutting operation, and the workability at the time of cutting is impaired.

  The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is that a band saw cutting machine that cuts a cutting material by revolving an endless band-shaped band saw works at the time of cutting. An object of the present invention is to provide a locking mechanism for maintaining the closed state of the cover to be hinged without impairing the performance.

  In solving the above-mentioned problems, the band saw cutting machine according to the present invention takes the following means. That is, the band saw cutting machine according to the first aspect of the present invention has a housing and a pair of saw wheels supported by the housing, and the band saws are wound around the pair of saw wheels to circulate the band saw. A band saw cutting machine for cutting a cutting material, wherein a cover that covers the pair of saw wheels is supported by the housing so as to be openable and closable via a hinge, and a locking mechanism that holds a closed position of the cover. The band saw is set to be inside the winding range of the band saw.

  According to the band saw cutting machine according to the first aspect of the present invention, since the locking mechanism that holds the closed position of the cover is set inside the rotation range of the band saw, the locking mechanism is provided outside the rotation range of the band saw. It does n’t exist. Accordingly, it is possible to provide a locking mechanism while eliminating the bulkiness of the band saw around the outer periphery. That is, it is possible to provide a locking mechanism that maintains the closed state of the cover to be hinged without impairing the workability at the time of cutting.

  A band saw cutting machine according to a second invention is the band saw cutting machine according to the first invention, wherein the locking mechanism moves the cover from the open position to the closed position, and the cover is in the closed position. In this configuration, the cover is automatically locked. According to the band saw cutting machine of the second invention, the locking mechanism moves the cover from the open position to the closed position and automatically locks to the cover when the cover is in the closed position. The closed position of the cover can be held only by closing. Accordingly, the closed position of the cover can be automatically held without performing a locking operation for holding the closed position of the cover, and the operability of holding the closed position becomes excellent.

  The band saw cutting machine according to a third aspect of the present invention is the band saw cutting machine according to the first or second aspect of the invention, wherein the locking mechanism has a release operation part for releasing the holding of the closed position of the cover. It is the structure that it is provided in the latching | locking part itself latched by the side. According to the band saw cutting machine according to the third aspect of the invention, since the release operation part for releasing the holding of the cover in the closed position is provided in the locking part itself locked on the cover side, the number of parts is increased. A canceling operation unit is provided. Thereby, the bulk of the locking mechanism can be suppressed, and a band saw cutting machine excellent in workability can be obtained.

It is the whole band saw cutting machine front view. It is a whole top view which shows the (II) arrow in FIG. It is a whole top view of (III) arrow in FIG. It is a whole top view which looks at the cover of a closed state from the front. It is a whole top view which looks at the cover of an open state front. It is a whole perspective view which squints the cover of a closed state by changing an angle. FIG. 5 is an overall cross-sectional view showing an enlarged view of (VII)-(VII) cross-section in FIG. 4.

  Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is an overall front view of the band saw cutting machine 10. FIG. 2 is an overall plan view showing an arrow (II) in FIG. FIG. 3 is an overall plan view taken in the direction of arrow (III) in FIG. FIG. 4 is an overall plan view of the cover 50 in the closed state when viewed from the front. FIG. 5 is an overall plan view of the cover 50 in the opened state when viewed from the front. FIG. 6 is an overall perspective view of the cover 50 in a closed state at different angles. FIG. 7 is an overall cross-sectional view showing the (VII)-(VII) cross-sectional arrow view in FIG. 4 in an enlarged manner. In this type of band saw cutter 10, it is customary to refer to the left side in FIG. 1 as the front side and the right side as the rear side. For this reason, unless otherwise specified in the following description, the front-rear direction is used according to this convention.

  As shown in the figure, the band saw cutting machine 10 is a portable band saw called a rechargeable portable band saw. The band saw cutter 10 includes a pair of front and rear saw wheels 13 and 14 that rotate using an electric motor 11 as a drive source, a saw wheel housing 20 that houses the front and rear saw wheels 13 and 14, and the front and rear saw wheels 13 and 14. It has an endless band saw 15 stretched between them. The saw wheel housing 20 includes a front housing portion 21 that accommodates and supports the front saw wheel 13 and a rear housing portion 22 that accommodates and supports the rear saw wheel 14. The electric motor 11 is attached to the upper surface of the rear housing part 22. Therefore, the rear saw wheel 14 functions as a drive wheel that is directly rotated by the electric motor 11, and the front saw wheel 13 functions as a driven wheel.

  A band saw 15 having a certain width and having flexibility in the thickness direction is stretched between a rear saw wheel 14 as a driving wheel and a front saw wheel 13 as a driven wheel. A tension lever 25 is disposed on the upper surface of the front housing portion 21. By rotating the tension lever 25 within a certain angle range, the front saw wheel 13 can be moved in the front-rear direction to adjust the relative distance from the rear saw wheel 14. Thereby, the tension of the band saw 15 spanned between the both saw wheels 13 and 14 can be adjusted, and the band saw 15 can be attached to and detached from the both saw wheels 13 and 14.

  The front housing portion 21 and the rear housing portion 22 are coupled to each other via a coupling housing portion 23 between their upper portions. A substantially rectangular opening 30 is provided between the front and rear housing parts 21 and 22 below the coupling housing part 23 in plan view. A first guide member 31 is attached to the front side of the opening 30, and a second guide member 32 is attached to the rear side of the opening 30. The band saw 15 is exposed at the opening 30. The rear saw wheel 14 as a drive wheel rotates counterclockwise (counterclockwise) in FIG. For this reason, the band saw 15 rotates in the counterclockwise direction, and the band saw 15 exposed in the opening 30 moves from the front side to the rear side (left side to right side in FIG. 1). An arrow 27 indicating the moving direction of the band saw 15 in the opening 30 is displayed on the upper surface of the front housing portion 21. In the following description, the direction indicated by the arrow 27 is also simply referred to as the turning direction of the band saw 15. The longitudinal direction of the band saw cutter 10 is opposite to the direction of rotation of the band saw 15. The circulating band saw 15 cuts the cutting material by being pressed.

  A handle portion 40 that is gripped by the user is provided on the upper portion of the saw wheel housing 20. The handle portion 40 is attached in a state straddling between the upper portion of the rear housing portion 22 and the coupling housing portion 23. The handle portion 40 includes a main grip portion 41 that a user holds with one hand, and a sub grip portion 42 that holds with the other hand. The main grip portion 41 has a mountain shape from the right side portion of the rear housing portion 22 to the front and upward on the rear side (front side in the circumferential direction of the band saw 15) from the cutting portion (the cutting portion of the band saw 15 with respect to the cutting material) in the opening 30. It extends, and the tip end side (front end side) is lowered downward.

  As shown in FIG. 1, the handle axis J41 (see FIGS. 1 and 4) of the main grip portion 41 is inclined in an upwardly inclined direction from the rear side toward the front side. The user holding the main grip portion 41 exerts a pressing force (cutting force of the band saw 15 on the cutting material) in a direction substantially perpendicular to the handle axis J41. The position and orientation of the main grip portion 41 are appropriately set so that the cutting site (cutting site) of the band saw 15 with respect to the cutting material is positioned in the direction in which the pressing force of the user's hand acts. Thereby, the pressing force by the user's hand holding the main grip portion 41 is efficiently applied to the cutting site, and the cutting operation can be quickly performed in an easy posture while reducing the burden on the user's wrist. It has become.

  The front end portion of the main grip portion 41 is coupled to the handle base 43. On the lower surface side of the main grip portion 41, a switch lever 44 that is pulled by the fingertip of the hand that holds the main grip portion 41 is provided. When the switch lever 44 is pulled upward with a fingertip, the electric motor 11 is activated and the band saw 15 goes around. The handle base 43 is screwed to the upper surface of the coupling housing part 23. A sub-grip portion 42 extends from the handle base 43 further upward and obliquely upward. By holding the main grip portion 41 with one hand and holding the sub-grip portion 42 with the other hand, the band saw cutting machine 10 can be held in a stable posture and the cutting operation can be performed quickly and easily. .

  A lighting tool 45 is disposed on the upper surface of the handle base 43. By this illuminator 45, the periphery of the cutting portion of the band saw 15 exposed to the opening 30 with respect to the cutting material is brightly illuminated. Thereby, the convenience of the cutting | disconnection work in a dark place etc. is achieved. An LED (light emitting diode) is used for the illumination tool 45. Similarly to the electric motor 11, the illuminator 45 also uses the battery pack 19 as a power source. Further, as shown in FIG. 2 and the like, a hook 46 is attached to the right side portion of the handle base 43. With the hook 46, the band saw cutting machine 10 can be hooked on a scaffold at a work site, for example.

  A battery mounting portion 47 is provided at the rear end portion of the main grip portion 41. A battery pack 19 is attached to the battery mounting portion 47. The battery pack 19 is composed of a lithium ion battery in which a plurality of cells are accommodated in a battery case. The battery pack 19 is attached to and detached from the battery mounting portion 47 in a sliding manner. When the battery pack 19 is charged, the battery pack 19 is removed from the battery mounting portion 47 and charged by a special charger prepared separately. An auto stop controller (AS controller) 48 is built in the battery mounting portion 47. The AS controller 48 monitors the power supply state including the supply current and remaining amount of the battery pack 19. If an abnormality occurs in the AS controller 48, the power circuit is shut off and the electric motor 11 is automatically stopped. (Auto stop function)

  The saw wheel housing 20 is provided with a cover 50 that covers the pair of saw wheels 13 and 14. The cover 50 includes a cover body 51 that is set so as to cover the front housing portion 21 and the rear housing portion 22. The cover body 51 includes a front cover portion 53 that faces the front housing portion 21, a rear cover portion 54 that faces the rear housing portion 22, and a connecting portion 55 that integrally connects the front cover portion 53 and the rear cover portion 54. Have The cover body 51 is hinge-coupled to the saw wheel housing 20 at a coupling side edge 56 serving as an upper edge. Specifically, bearing portions 57 are provided on the front and rear sides of the coupling-side end edge 56 of the cover body 51. A support shaft 37 is inserted into the bearing portion 57. The support shaft 37 is supported by a shaft support portion 36 provided at the coupling side end edge 35 of the saw wheel housing 20. That is, the cover body 51 is rotatable including the bearing portion 57 with the support shaft 37 as a rotation shaft, and is supported by the saw wheel housing 20 via the support shaft 37.

  The front cover portion 53 and the rear cover portion 54 are formed to have substantially symmetrical shapes in the front-rear direction with the front-rear intermediate axis J50 as the axis of symmetry. The connecting part 55 connects the front cover part 53 and the rear cover part 54 together. The connecting portion 55 is set by extending the coupling-side end edge 35 so as to provide the opening 30. The cut portion (cutting portion) of the band saw 15 with respect to the cutting material is set by the shape in which the opening portion 30 of the connecting portion 55 is provided. Here, the front cover portion 53 and the rear cover portion 54 integrally have an opposing flat surface portion 60 and a surrounding inclined portion 65 that are set in a substantially symmetric shape with the front / rear intermediate axis J50 as an axis of symmetry. In describing the opposed flat surface portion 60 and the surrounding inclined portion 65 that are substantially symmetrical in the front and rear directions, the front cover portion 53 will be described as a representative.

  The opposing plane part 60 has a planar shape that faces the saw wheel 13 (14). The opposed flat surface portion 60 is provided with a surface strip portion 61 drawn along the circumferential direction when viewed from the front in FIG. The surface strip portion 61 has a step shape that can be brought closer to the saw wheel 13 (14) side than the opposed flat surface portion 60. On the other hand, the peripheral inclined portion 65 is provided on the outer periphery of the opposed flat surface portion 60. The peripheral inclined portion 65 is formed in an inclined surface shape that is closer to the outer periphery of the saw wheel housing 20 toward the outer peripheral end.

  By the way, between the saw wheel housing 20 and the cover body 51, a locking mechanism 70 that holds the closed position of the cover 50 is provided. The locking mechanism 70 includes a pair of a front locking mechanism 71 and a rear locking mechanism 81. The front locking mechanism 71 is provided between the front housing portion 21 and the front cover portion 53, and the rear locking mechanism 81 is provided between the rear housing portion 22 and the rear cover portion 54. The front locking mechanism 71 and the rear locking mechanism 81 are provided on the saw wheel housing 20 and the cover body 51 that are located on the inner peripheral side of the rotation range of the band saw 15. Both the front locking mechanism 71 and the rear locking mechanism 81 are formed to have a substantially symmetrical shape in the front-rear direction with the front-rear intermediate axis J50 as the axis of symmetry. Therefore, in describing the front locking mechanism 71 and the rear locking mechanism 81 below, the front locking mechanism 71 will be described as a representative, and the rear locking mechanism 81 will be described when describing the front locking mechanism 71. A part of the description is omitted by adding a reference numeral in parentheses after the reference numeral.

  The front locking mechanism 71 (81) includes a male part 72 (82) provided in the front housing part 21 (22) and a female part 77 (87) provided in the front cover part 53 (54). The male part 72 (82) is provided in the front housing part 21 (22) located on the inner peripheral side from the rotating range of the band saw 15. Specifically, as the position of the male part 72 (82), the front housing part 21 exists between the opening part 30 where the cutting part (cutting part) of the band saw 15 is disposed and the coupling housing part 23 on the opposite side. (22) is provided. The female part 77 (87) is formed by setting a female hole 78 (88) in the cover body 51 corresponding to the male part 72 (82).

  The female hole 78 (88) is formed by penetrating the front cover portion 53 (54) in a rectangular shape in front view. Here, the proximal end edge 781 (881) of the female hole 78 (88) having a rectangular shape in front view is set to a portion where an opposing hook portion 751 (851) described below is locked. A guide taper surface 79 (89) is provided in the front cover portion 53 (54) of the adjacent side edge 781 (881). As the guide taper surface 79 (89) protrudes inward, the guide taper surface 79 (89) is further inclined toward the closer direction. When the male portion 72 (82) is locked to the female portion 77 (87), this guide taper surface 79 (89) is made to contact an opposing taper surface 753 (853) described later.

  The male part 72 (82) is provided by screwing the male member 73 (83) to the rib part 211 (221) of the front housing part 21 (22) by a screw 76 (86). The male member 73 (83) is formed by integrally molding the bracket member 74 and the locking member 75. Specifically, the bracket member 74 (84) is formed by molding an elastically deformable metal leaf spring into an approximately L shape in side view. The bracket member 74 (84) includes a mounting plate portion 741 (841) screwed by a screw 76 (86) and a support spring portion 743 (843) extending in a direction orthogonal to the mounting plate portion 741 (841). It is formed by connecting. A resin locking member 75 (85) is integrally provided at the outer end of the support spring portion 743 (843). Here, the bracket member 74 of the front locking mechanism 71 and the bracket member 84 of the rear locking mechanism 81 are screwed together so that the substantially L-shapes in a side view face each other. Therefore, the support spring portions 743 and 843 of the bracket members 74 and 84 can be elastically swung in the front-rear direction.

  The locking member 75 (85) has a hook shape that is locked in a female hole 78 (88) described below. Specifically, the locking member 75 (85) is integrally formed with an opposing hook portion 751 (851) having a hook shape and an opposing tapered surface 753 (853) for locking and guiding the male portion 72 (82). Has been. The opposing hook portion 751 (851) is set to be engaged with the female hole 78 (88) in a direction in which both the front locking mechanism 71 and the rear locking mechanism 81 face each other. That is, the hook-like hook shape is set facing the rear side in the opposing hook portion 751 of the front locking mechanism 71, and the hook shape facing the front side is set in the opposing hook portion 851 of the rear locking mechanism 81. The mold hook shape is set. For this reason, the opposing hook portions 751 and 851 are engaged with the female holes 78 and 88 in a direction facing each other, and the engagement with the female holes 78 and 88 is released in a direction away from each other. It has become so.

  Further, the opposing tapered surface 753 (853) is also set so that both the front locking mechanism 71 and the rear locking mechanism 81 face each other, like the opposing hook portion 751 (851). The opposing taper surface 753 (853) is set to have a tapered shape that inclines in a direction in which both the front locking mechanism 71 and the rear locking mechanism 81 face each other toward the base end 756 (856) side. Yes. For this reason, when the male parts 72 and 82 are locked to the female parts 77 and 87, the opposed tapered surfaces 753 and 853 of the male parts 72 and 82 are brought into contact with the guide tapered surfaces 79 and 89 of the female parts 77 and 87. . Then, the guide taper surfaces 79 and 89 are brought into sliding contact with the base end portions 756 and 856 from the member tip portions 755 and 855 of the opposing taper surfaces 753 and 853.

  With this sliding contact, the support spring portions 743 and 843 are elastically oscillated in the front-rear direction, and the male portions 72 and 82 are both moved away from each other. Here, when the respective opposing hook portions 751 and 851 enter the female holes 78 and 88, the movement of the male portions 72 and 82 in the direction away from each other ends, and the elastic restoring force of the support spring portions 743 and 843 ends. The opposing hook portions 751 and 851 are locked to the adjacent side edges 781 and 881 of the female holes 78 and 88. That is, the closed state of the cover 50 is maintained. That is, the male member 73 (83) corresponds to the locking portion according to the present invention, and when the cover 50 is disposed at the closed position, the close end on the cover 50 side so as to hold the closed position of the cover 50. Locked to the edges 781, 881.

  On the other hand, when the opposing hook portions 751 and 851 are engaged with the female holes 78 and 88, if the operation of moving both of the member tip portions 755 and 855 away from each other is performed, the female holes 78 and 88 are performed. The locking of the opposing hook portions 751 and 851 with respect to the adjacent side edges 781 and 881 is released. Then, the opposing hook portions 751 and 851 can be extracted from the female holes 78 and 88, and the closed state of the cover 50 is released. As a result, the user can open the cover 50 to the open position, and can make appropriate adjustments such as replacement of the band saw 15. That is, the member front end portions 755 and 855 correspond to the release operation portion according to the present invention, and are provided on the male member 73 (83) itself as the locking portion.

  According to the band saw cutting machine 10 described above, since the locking mechanism 70 that holds the closed position of the cover 50 is set inside the rotation range of the band saw 15, the locking mechanism 70 is provided outside the rotation range of the band saw 15. No longer exists. As a result, the locking mechanism 70 can be provided while the bulkiness outside the circumferential range of the band saw 15 can be eliminated. That is, the locking mechanism 70 that holds the closed state of the cover 50 that is hinge-coupled (indicated by reference numerals 36, 37, and 57) can be provided without impairing the workability at the time of cutting.

  Further, according to the band saw cutting machine 10 described above, the locking mechanism 70 is automatically locked to the cover 50 when the cover 50 is moved from the open position to the closed position and the cover 50 is in the closed position. The closed position of the cover 50 can be held only by closing the cover 50. Accordingly, the closed position of the cover 50 can be automatically held without performing a locking operation for holding the closed position of the cover 50, and the operability of holding the closed position becomes excellent. . Further, according to the band saw cutting machine 10 described above, the member front end portions 755 and 855 for releasing the holding of the closed position of the cover 50 are provided on the male member 73 (83) itself locked to the cover 50 side. The member tip portions 755 and 855 are provided without increasing the number of parts. Thereby, the bulkiness of the locking mechanism 70 can be suppressed, and the band saw cutting machine 10 excellent in workability can be obtained.

  The band saw cutting machine according to the present invention is not limited to the above-described embodiment, and may be configured by appropriately changing the location as follows. That is, in the above-described embodiment, it is only necessary that the disposition position of the locking mechanism is set on the inner side of the band saw rotation range, and the present invention is not limited to the disposition position of the above-described embodiment. . Further, the configurations of the male portions 72 and 82 and the female portions 77 and 87 including the male members 73 and 83 constituting the locking portion are not limited to the above-described embodiment, and an appropriate locking configuration is adopted. be able to. Moreover, as a structure which the opposing hook parts 751 and 851 latch, appropriate | suitable opposing structures, such as latching in a mutually reverse direction, etc. are employable. Here, when such a locking configuration is adopted, the release operation direction by the release operation unit may be a direction opposite to the lock direction, and the operability of the product is excellent. be able to.

10 Band saw cutting machine 11 Electric motor 13 Saw wheel (driven wheel)
14 Saw wheel (drive wheel)
15 Band saw 19 Battery pack 20 Saw wheel housing 21 Front housing part 211 Rib part 22 Rear housing part 221 Rib part 23 Joint housing part 25 Tension lever 27 Arrow 28 Upper end edge 29 Support shaft 30 Opening part 31 First guide member 32 Second Guide member 35 Coupling side edge 36 Shaft support portion 37 Support shaft 40 Handle portion 41 Main grip portion 42 Sub grip portion 43 Handle base 44 Switch lever 45 Illuminator 46 Hook 47 Battery mounting portion 48 Controller 50 Cover 51 Cover body 53 Front cover Part 54 rear cover part 55 connecting part 56 coupling side edge 57 bearing part 60 opposing flat part 61 surface strip part 65 peripheral inclined part 70 locking mechanism 71 front locking mechanism 81 rear locking mechanism 72, 82 male part 73, 83 male Member (locking part)
74, 84 Bracket members 741, 841 Mounting plate portions 743, 843 Support spring portions 75, 85 Locking members 751, 851 Opposing hook portions 753, 853 Opposing taper surfaces 755, 855 Member front end portion (release operation portion)
756, 856 Base end portion 76, 86 Screw 77, 87 Female portion 78, 88 Female hole 781, 881 Proximal side edge 79, 89 Guide taper surface J41 Handle axis J50 Front / rear intermediate axis

Claims (4)

A band saw cutting machine having a housing and a pair of saw wheels supported by the housing, cutting the cutting material by turning the band saw around the pair of saw wheels,
A cover that covers the pair of saw wheels is supported by the housing so as to be openable and closable via a hinge,
The locking mechanism that holds the closed position of the cover is set inside the rotation range of the band saw ,
The locking mechanism has an opposing tapered surface provided on the housing and a guide tapered surface provided on the cover.
The locking mechanism abuts the opposing tapered surface and the guide tapered surface when the cover is moved from the open position to the closed position, and automatically locks the cover when the cover is in the closed position. , Band saw cutting machine. A band saw cutting machine having a housing and a pair of saw wheels supported by the housing, cutting the cutting material by turning the band saw around the pair of saw wheels,
A cover that covers the pair of saw wheels is supported by the housing so as to be openable and closable via a hinge,
The housing includes a front housing portion that supports one saw wheel of the pair of saw wheels, and a rear housing portion that supports another saw wheel of the pair of saw wheels,
The locking mechanism that holds the closed position of the cover is set inside the rotation range of the band saw , and is disposed in the front housing portion and the rear housing portion, respectively.
The locking mechanism is composed of one locking portion on the housing side and another locking portion on the cover side, and the one locking portion and the other locking portion lock each other. Can hold the closed position of the cover;
The direction in which the locking state of the one locking part and the other locking part is released is a direction opposite to the direction in which the tension of the band saw pulls the front housing part and the rear housing part together. Cutting machine. The band saw cutter according to claim 2 ,
The locking mechanism moves to the closed position the cover from the open position, when said cover is in the closed position, automatically causes locking of the cover, band saw cutting machine. In the band saw cutting machine according to any one of claims 1 to 3 ,
The locking mechanism is a band saw cutting machine in which a release operation section for releasing the holding of the closed position of the cover is provided in the locking section itself locked on the cover side.

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