JP6505558B2 - Inclined indexing device - Google Patents

Description

  The present invention relates to a frame having a rack and a pair of supports standing upright on the rack, and a pair of rotary shafts supported by each of the supports. A table having a pair of rotary shafts rotatably supported on the support table via bearings and a base portion on which the work is placed and a pair of arm portions supporting the base portion, the pair of arms A table supported by a pair of the rotation shafts in the unit, and a drive device provided on at least one of the pair of the support pedestals for rotationally driving the table via the rotation shaft, and the table And a torque compensation device that compensates for unbalance torque applied to the rotation shaft when it is inclined.

  As an inclination index apparatus as described above, for example, there is one disclosed in Patent Document 1. More specifically, with respect to the inclined indexing device disclosed in Patent Document 1, the inclined indexing device includes a base as a gantry, a pair of support blocks mounted on the base so as to be separated from each other, and Each frame is provided with a pair of support bases consisting of a support frame installed on each support block, and an eccentric jig as a table supported by the frame. Moreover, the table (eccentric jig) is comprised by the bottom part as a base part, and a pair of bracket part as a pair of arm parts standingly arranged by the both edges of the bottom part. The inclined indexing apparatus has a pair of rotating shafts rotatably supported via bearings at each support in the frame, and the table rotates at its arms (brackets). It is supported by a shaft, and is provided rotatably around the axis (rotation axis) of the rotation shaft with respect to the frame.

  Further, the inclined indexing device of Patent Document 1 is a drive device provided on one of a pair of supports in a frame, and a drive motor, a worm shaft connected to an output shaft of the drive motor, a worm It has a drive (indexing mechanism) comprising a worm supported on a shaft and a worm gear mechanism formed of a worm wheel attached to the above-mentioned rotation shaft and meshed with the worm. Therefore, in the inclined indexing apparatus, one of the pair of rotating shafts supporting the table is rotationally driven by the driving device using the driving motor as a driving source, whereby the table is rotationally driven to a desired angular position. Is configured to be inclined.

  Furthermore, the inclined indexing device of Patent Document 1 includes a balance cylinder as a torque compensation device provided in a form supported by the frame on the other side of the pair of supports in the frame. Incidentally, this torque compensation device is for compensating unbalance torque applied to the rotation shaft in the inclined state.

  Specifically, in the inclined indexing apparatus, the center of gravity of the table in a state in which the work or the like is placed is biased to the base portion side with respect to the axial center of the rotation axis, so the unbalanced torque is the rotation axis in the inclined state. The unbalance torque changes with the angular position of the table in the inclined state. And such unbalance torque becomes a cause of lowering the indexing accuracy in the inclination indexing device. Therefore, the tilt index device of Patent Document 1 is configured to include a balance cylinder as a torque compensation device in order to compensate for such unbalance torque and prevent a decrease in index accuracy due to the unbalance torque. ing. The inclined state of the table mentioned above means that the center of gravity of the table is not located on the vertical line passing through the axis of the rotation axis, and the position of the center of gravity is vertically below (or vertically above) the axis of the rotation axis. The table is rotated at an angle of less than 180 ° from the position (the same applies to the following).

  Further, in the inclined indexing device of Patent Document 1, as described above, the balance cylinder is supported by the frame on the other side (the other support side) of the pair of supports in the frame. It is provided. More specifically, the balance cylinder is disposed on the frame (base) on the side opposite to the table side with respect to the other support, and at the end of the rod on the side opposite to the cylinder body side of the rod It is rotatably supported about an axis parallel to the axis, and is connected to the rotation axis supported by the other support at the cylinder body. The connection between the cylinder body and the rotary shaft is performed at a position eccentric from the axial center of the rotary shaft via a crank member fixed to the rotary shaft.

  Then, according to the configuration, the balance cylinder receives the pressure of the working fluid as the working fluid (pressure oil, compressed air, etc.) is supplied to the cylinder body, and the rod protrudes from the cylinder body The cylinder is driven away from the tip of the rod because the rod is supported at its tip by the frame which is a fixed part of the inclined indexing device, although it is driven in the direction of increasing quantity. It is in a state of being energized. Therefore, in that state, the cylinder body is biased as described above at the connection position with the cylinder body (position eccentric to the axis of the rotation axis) with respect to the crank member fixed to the rotation axis. The accompanying biasing force acts, whereby a rotational torque (moment) is applied to the rotating shaft.

  Therefore, in the inclined indexing apparatus having such a configuration, in the inclined state of the table, a rotational torque having a magnitude corresponding to the unbalance torque described above, and a rotational torque in a direction opposite to the unbalance torque is The unbalance torque in the inclined state is compensated by controlling the supply of the working fluid to the cylinder body so that the cylinder body is biased with an applied biasing force.

Japanese Patent Application Publication No. 2005-28539

  By the way, although there is no description about the support position in the rotating shaft in patent document 1 about support of the rotating shaft by the bearing in each support stand of the above-mentioned frame, in a general inclination indexing device, each rotating shaft is It is supported by a single bearing at an intermediate portion in the longitudinal direction. Further, in the inclined indexing apparatus disclosed in Patent Document 1, the balance cylinder is provided on the opposite side to the table with respect to the other support as described above, and is supported by the other support. The shaft (the other rotation shaft) is connected to an end (the other end) opposite to one end of the rotation shaft that supports the table. Therefore, in the inclined indexing device disclosed in Patent Document 1, the biasing force by the balance cylinder for compensating the above-mentioned unbalance torque acts on the other end of the other rotation shaft. There is.

  In that case, although the biasing force by the balance cylinder acts on the other rotation axis to apply the rotation torque as described above, it acts along the rotation direction of the rotation axis. Instead, it acts linearly at a position eccentric to the axis of the rotary shaft. Therefore, as the biasing force of the balance cylinder acts on the rotation shaft, the other rotation shaft is not only given the rotation torque as described above, but also pressing force along the advancing and retracting direction of the rod in the balance cylinder ( It will also be in the state of receiving pressure). Moreover, in that state, the pressing force acts on the other rotating shaft at the other end portion separated from the supporting position by the bearing in the axial direction. Therefore, the pressing force acts on the other rotation shaft as a force to rotate the other rotation shaft around the bearing with the support position as a fulcrum.

  As a result, in the inclined indexing apparatus disclosed in Patent Document 1, the other rotating shaft is accompanied by the biasing force by the balance cylinder acting on the other rotating shaft in order to compensate the above-mentioned unbalanced torque. The load (load which tends to incline the shaft center) by the pressing force is applied to the bearing supporting the shaft, and the bearing is likely to be damaged such as uneven wear or deformation due to the load. And, if such a failure occurs in the bearing, there arises a problem that the indexing accuracy in the table is lowered.

  Therefore, the present invention is, as described above, in the inclined indexing apparatus as described above, by reducing the load acting on the bearing that supports the rotating shaft when the biasing force by the torque compensation device acts on the rotating shaft. It is an object of the present invention to suppress the damage of the bearing and to prevent the lowering of the indexing accuracy of the table.

  Therefore, in order to achieve the above object, according to the present invention, in the inclined indexing device, at least one of the pair of rotation shafts is a pair of shaft portions, and both of them are viewed in the axial direction of the shaft portions. Provided between a pair of shaft parts which are coaxially spaced and provided in the axial direction and are located between the pair of shaft parts in the axial direction and are eccentrically located with respect to the shaft center of the shaft part And the supporting portion connecting the pair of the shaft portions and the eccentric portion, the eccentric shaft corresponding to the pair of the shaft portions via the bearings. It is supported by a support stand, The said torque compensation apparatus is characterized by being connected with respect to the said eccentric part of the said eccentric shaft which is the said rotating shaft.

  As described above, in the inclined indexing device according to the present invention, the rotary shaft to which the torque compensation device of the pair of rotary shafts is connected has a pair of shaft portions supported by the frame via the bearings, ie, The rotating shaft is supported by the frame at two points via the bearing, and the eccentric portion to which the torque compensation device is directly connected is connected to both shaft portions by the supporting portion, ie, a pair of rotating shafts The above-mentioned eccentric part is located between the shaft parts of the above. According to the configuration, in the inclined indexing apparatus according to the present invention, in a state where the rotational shaft receives the pressing force as the torque compensation apparatus applies the biasing force to the eccentric portion as described above, The force is received by a pair of shafts in the rotary shaft, each supported by the frame via a bearing. Therefore, according to the inclined indexing device according to the present invention, the load applied to the bearing provided to support the rotating shaft relative to the frame is reduced as compared with the conventional device, and thus uneven bearing wear and deformation, etc. The breakage is suppressed, and the deterioration of the indexing accuracy of the tilt indexing device due to the breakage of the bearing is also prevented.

FIG. 1 is a front view showing the whole of one embodiment of a tilt indexing device according to the present invention. FIG. 5 shows a partial cross-sectional view of an embodiment of a tilt indexing device according to the present invention. FIG. 2 shows a cross-sectional view of the essential parts of one embodiment of the inclined indexing device according to the invention. FIG. 6 shows a cross-sectional view of the essential parts of another embodiment of the inclined indexing device according to the invention. FIG. 6 shows a cross-sectional view of the essential parts of yet another embodiment of the inclined indexing device according to the present invention.

  Hereinafter, an embodiment of a tilt index device according to the present invention will be described based on FIGS. 1 to 3.

  As shown in FIG. 1, the tilt indexing apparatus 1 mainly comprises a frame 10 and a table 20. Further, in the inclined indexing device 1, the table 20 is supported by a pair of rotating shafts 30 and 31 supported by the frame 10.

  More specifically, the frame 10 is a frame 11 serving as a base, and is a plate-like frame 11 having a rectangular shape in plan view, and a longitudinal direction of the frame 11 (long side direction in plan view, right and left in FIG. And a pair of supports 12 and 13 erected on the rack 11 at intervals (spaced apart) from each other.

  Further, on the frame 10, the rotary shafts 30, 31 are rotatably supported via bearings 40, 41 in the pair of supports 12, 13, respectively. That is, the inclined indexing apparatus 1 includes a pair of rotating shafts 30 and 31, and each of the rotating shafts 30 and 31 is rotated via bearings 40 and 41 in each of the pair of supports 12 and 13 in the frame 10. It has become a supported configuration. The pair of rotation axes 30, 31 are oriented such that the rotation axis extends in parallel with the longitudinal direction, and when viewed in the longitudinal direction (direction of the rotation axis), both rotation axes are It is provided at the same position. Each of the rotary shafts 30, 31 has a disk-shaped mounting portion 30a, 31a at one end. The rotary shafts 30 and 31 are provided such that the mounting portions 30 a and 31 a face each other, and the mounting portions 30 a and 31 a protrude from the support bases 12 and 13.

  Further, the table 20 is constituted by a plate-like base portion 21 having a substantially rectangular mounting surface on which the work is mounted, and a pair of arm portions 22 and 22 for supporting the base portion 21. There is. However, the pair of arm portions 22, 22 are separated in the longitudinal direction of the mounting surface of the base portion 21, are orthogonal to the mounting surface of the base portion 21, and are continuous with both ends in the long side direction. And is integrally formed with the base portion 21. The table 20 is disposed between the pair of supports 12 and 13 in the frame 10 (between the rotary shafts 30 and 31 (attaching portions 30a and 31a)) in such a manner that the long side direction coincides with the longitudinal direction. A state in which the arm portion 22 is fixed to the mounting portions 30a, 31a of the rotating shafts 30, 31 opposite to the arm portion 22 so as to be supported by the frame 10 (pair of supports 12, 13) via the rotating shafts 30, 31 It has become.

  As described above, in the inclined indexing device 1 on which the present invention is premised, the table 20 is supported with respect to the frame 10 via the arm portion 22 and the table 20 with respect to the axial centers of the rotating shafts 30 and 31. The mounting surface of the present invention is configured to be decentered in the radial direction of the rotation shafts 30, 31 (the extending direction of the arm portion 22), and is a so-called cradle type inclined indexing device. And since each rotating shaft 30 and 31 is rotatably supported with respect to the flame | frame 10 via the bearings 40 and 41 as mentioned above, the table 20 sets the rotating shaft 50 of a pair of rotating shaft 30 and 31 to It is in a state of being supported rotatably (oscillating) as a rotation center. Since the table 20 rotates about the rotation axis 50 with respect to the rotation axis 50, the rotation axis 50 can be said to be the rotation axis of the table 20.

  The inclined indexing apparatus 1 is provided with a drive unit 60 for swinging and driving the table 20 provided as described above, but in the present embodiment, the drive unit 60 comprises a pair of frames 10. It is assumed that it is provided only on the side of one of the supports 12 and 13 (the support 12 on the left side in FIG. 1). Therefore, hereinafter, the support on the side on which the drive device 60 of the pair of supports 12 and 13 in the frame 10 is provided is the drive-side support 12 and the support on the other side is the driven-side support 13 Do. In addition, although the inclined indexing device 1 on which the present invention is premised has a torque compensation device for compensating for the unbalanced torque as described above, in this embodiment, the torque compensation device is a driven side It is assumed that the support 13 is provided.

  FIG. 2 shows an example of the drive side support 12. As shown in FIG. 2, the drive side support 12 has a through hole penetrating the drive side support 12 in the longitudinal direction. The rotary shaft 30 on the drive-side support 12 side (hereinafter also referred to as "one rotary shaft 30") is inserted in the through hole in a state in which the portion excluding the mounting portion 30a is inserted into the through hole. A substantially central portion is supported by a bearing 40 provided in a form fitted into the through hole.

  In addition, in the present embodiment, the drive device 60 is a drive motor (not shown) as a drive source for rotationally driving one rotation shaft 30, and rotation of the output shaft of the drive motor corresponds to one rotation shaft. It comprises the drive transmission mechanism 61 which transmits to 30. Further, the drive transmission mechanism 61 is rotatably supported by the drive side support base 12 in a form of meshing engagement with the worm wheel 61a attached to the one rotation shaft 30 so as to be incapable of relative rotation with the worm wheel 61a And a worm spindle 61b connected to the motor.

  Then, in the tilt indexing device 1, the drive motor in the drive device 60 is controlled in accordance with a preset numerical control program, and accordingly, the rotary shaft 30 is rotationally driven and the table 20 is targeted It is indexed to the angular position (tilted position). In the inclined indexing device 1 on which the present invention is premised, the drive device 60 is not limited to one including the drive transmission mechanism 61 as described above, and a direct drive type in which the rotor is directly connected to the rotation shaft The drive motor (so-called, DD motor) may be used.

  The inclined indexing apparatus 1 is provided with a clamp device 70 for holding the angular position of the table 20 indexed as described above, and in the present embodiment, the clamp device 70 is a drive side support It is provided in the form incorporated in both the stand 12 and the driven support 13.

  Further, in the present embodiment, as the clamp device 70, there are provided a clamp disk 71 mounted non-rotatably relative to the rotary shafts 30, 31 and an annular clamp piston 72 incorporated at a position facing the clamp disk 71; A so-called disc type clamp device is adopted which is constituted by an annular cover member 73 attached to the supports 12 and 13 so as to face the clamp piston 72 with the clamp disc 71 interposed therebetween. In the clamp device 70 in the present embodiment, the clamp piston 72 has an annular shape formed by the bearing sleeve 74 for fixing the positions of the bearings 40 and 41 and the inner peripheral surface of the through hole in the support bases 12 and 13. , And slidably provided in the direction of the rotation axis 50 of the rotation shafts 30 and 31.

  Then, in the clamp device 70, the clamp piston 72 presses the clamp disc 71 toward the cover member 73 by the pressure of the working fluid such as pressure oil, and the clamp disc 71 is clamped by the clamp piston 72 and the cover member 73 ) To hold the table 20 at the indexed angular position, with the rotary shafts 30, 31 being incapable of rotating. However, the clamp device 70 provided in the inclined indexing device 1 on which the present invention is premised is not limited to the disc type clamp device as described above, but a so-called sleeve type provided with a clamp sleeve so as to surround a rotating shaft. The clamp device of

  In addition, as described above, the inclined indexing apparatus 1 of the present embodiment compensates for the unbalance torque applied to the rotating shaft 31 when the table 20 is indexed to the inclined position in the driven support 13. It has a torque compensation device to Furthermore, in the present embodiment, as the torque compensation device, a balance cylinder 80 is adopted in which the rod 81 is driven to move back and forth by the pressure of the working fluid (pressure oil, compressed air, etc.) and the biasing force is applied via the rod 81. It shall be done.

  The balance cylinder 80 has a cylinder body 82 supported rotatably on an axis parallel to the axis of the rotary shaft 31 on the frame 11 in the frame 10, and projects from one end side of the cylinder body 82 and the cylinder body 82. It comprises with the rod 81 supported so as to be able to move back and forth. In the balance cylinder 80, the axis of the rod 81 extends in the direction orthogonal to the rotation axis 50 of the rotation shaft 31 (table 20) in the state where the cylinder main body 82 is supported by the gantry 11 as described above. It is provided. In addition, the balance cylinder 80 is connected at the tip end of the rod 81 to the rotary shaft 31 on the side of the driven support 13 (hereinafter referred to as “the other rotary shaft 31”).

  However, the connection position of the rod 81 with respect to the other rotation shaft 31 is such that when the rod 81 is driven to advance by supplying the working fluid to the cylinder main body 82, rotational torque is given to the other rotation shaft 31 Thus, when viewed in the longitudinal direction, it is located at a position decentered from the rotation axis 50 of the rotation shaft 31. In other words, the other rotation shaft 31 to which the balance cylinder 80 as a torque compensation device is connected is configured as an eccentric shaft having a portion to which the rod 81 can be connected at a position eccentric from the rotation axis 50 A part (eccentric part) is the connection position. Furthermore, the direction of the rotational torque that the balance cylinder 80 (rod 81) applies to the other rotation shaft 31 of the connection position is the other rotation when the table 20 is in the inclined state in the inclination indexing device 1 The position is made to be opposite to the direction of the unbalanced torque acting on the shaft 31.

  And, in the inclined indexing apparatus 1, when the table 20 is in the inclined state for indexing of the angular position at the time of processing of the work placed on the table 20, the cylinder body 82 in the balance cylinder 80. On the other hand, the working fluid is supplied, and the balance cylinder 80 causes the rod 81 to apply a rotational torque to the other rotation shaft 31, whereby the other rotation is performed in the inclined state of the table 20 as described above. The unbalanced torque acting on the shaft 31 is to be compensated.

  In the inclined indexing device 1 as described above, the present invention is a rotating shaft which is at least one of the pair of rotating shafts and is configured as an eccentric shaft as described above to be coupled with the torque compensation device. Is supported by a pair of bearings, and a torque compensation device is connected between the pair of bearings with respect to the rotation shaft. Further, in the present embodiment, as described above, the other rotation shaft 31 supported by the driven support 13 is an eccentric shaft to which the balance cylinder 80 as the torque compensation device is connected. In the following, the configuration of the other rotary shaft 31 (hereinafter referred to as "eccentric shaft 35") configured as the eccentric shaft, and the support configuration of the eccentric shaft 35 on the side of the driven support 13, etc. This will be described in detail based on 3.

  As shown in FIG. 3, the driven support 13 in the present embodiment is constituted by two support pedestals 13 a and 13 b which are spaced apart from each other in the longitudinal direction and are erected on the gantry 11. That is, the driven support 13 has a configuration in which a space portion in which the balance cylinder 80 can be disposed is formed at an intermediate position in the longitudinal direction.

  Further, the eccentric shaft 35 is a connection for connecting the connecting shaft 38 to one of the pair of shaft members 36, 37 and the connecting shaft 38 connecting the pair of shaft members 36, 37, the both shaft members 36, 37. And a member 39. More specifically, it is as follows.

  First, the pair of shaft members 36 and 37 have the same configuration, and cylindrical shaft portions 36a and 37a and screw members (not shown) for the shaft portions 36a and 37a at one end of the shaft portions 36a and 37a And the like, and is constituted by disc-shaped disc portions 36 b and 37 b integrally attached by and the like. The connecting member 39 is a disk-shaped member in the present embodiment, and the plate thickness direction of the other end (the end opposite to the disk portion 36b) of the shaft portion 36a of one shaft member 36 is It can be attached in a state in which it is aligned with the axial direction of the shaft member 36 (= direction of the rotation axis 50). In addition, the connecting member 39 is mounted non-rotatably relative to the one shaft member 36 in such an arrangement that the center thereof coincides with the center of the one shaft member 36 when viewed in the axial direction.

  The eccentric shaft 35 is configured by connecting one shaft member 36 to which the connecting member 39 is attached and the other shaft member 37 by the connecting shaft 38. Specifically, in the eccentric shaft 35, one shaft member 36 and the other shaft member 37 are positioned such that their axial centers coincide with each other when viewed in the axial direction and are separated in the axial direction. It is related. However, the both shaft members 36, 37 are oriented such that the positions of the disk portions 36b, 37b with respect to the shaft portions 36a, 37a are the same in the axial direction. Therefore, in the state where both the shaft members 36 and 37 are placed in such a positional relationship, the connecting member 39 attached to one shaft member 36 and the disk portion 37b of the other shaft member 37 are in the axial direction. The centers of the two are aligned to face each other. Further, in the state, the distance between the one shaft member 36 and the other shaft member 37 in the axial direction is such that the connecting member 39 and the disc portion 37b of the other shaft member 37 are separated in the axial direction. Is set as.

  In addition, the eccentric shaft 35 is configured such that the connecting member 39 on one shaft member 36 side and the disk portion 37 b of the other shaft member 37 are connected by the connecting shaft 38. The connecting shaft 38 is mounted such that one end thereof is attached to the connecting member 39 and the other end is attached to the disk portion 37b of the other shaft member 37 in the direction in which the axis is parallel to the axial direction. It is in the form of being erected. Accordingly, the connecting shaft 38 is located between the shaft portions 36 a and 37 a of the both shaft members 36 and 37 in the axial direction. Further, the mounting positions of the connecting shaft 38 with respect to the connecting member 39 and the other shaft member 37 are separated (decentered) from the axial center of the both shaft members 36, 37 (shaft portions 36a, 37a) when viewed in the axial direction. It is in position.

  The eccentric shaft 35 configured in such a manner is configured such that the shaft members 36 and 37 are supported by the two support bases 13a and 13b that constitute the driven support base 13, respectively. It is supported against. More specifically, the eccentric shaft 35 is a support base on which one shaft member 36 is one of the two support bases 13a and 13b and is located inside in the longitudinal direction (the side of the drive support 12). With respect to the portion 13a, it is supported on its shaft portion 36a, and is the other of the two support portions 13a and 13b on the outer side in the longitudinal direction (opposite to the drive side support 12 side) With respect to the support base portion 13b located, the support base portion 13b is supported with respect to the driven support base 13 in a manner supported by the shaft portion 37a.

  Each of the shaft members 36, 37 is rotatable relative to the corresponding support portions 13a, 13b by supporting the shaft portions 36a, 37a in the support portions 13a, 13b via the bearings 41, 41. It is supported by Therefore, the eccentric shaft 35 is rotatably supported on the driven support 13 via the bearings 41, 41 as described above with the axes of the two shaft members 36, 37 (shaft portions 36a, 37a) as the rotation center. The axis (line passing through the axis) of the two shaft members 36, 37 (shaft portions 36a, 37a) is the rotation axis 50 of the eccentric shaft 35.

  In the present embodiment, the shaft portions 36a and 37a of the both shaft members 36 and 37 correspond to the shaft portion of the eccentric shaft of the present invention. Further, as described above, the connecting shaft 38 located between the shaft portions 36a and 37a (a pair of shaft portions) in the axial direction and located at a position eccentric to the shaft center of the both shaft portions 36a and 37a is It corresponds to the eccentric part in the eccentric shaft. Further, a connecting member 39 attached to one shaft member 36 connecting the connecting shaft 38 as the eccentric portion and the shaft portions 36a and 37a as a pair of shaft portions and the disk portion 37b of the other shaft member 37 It corresponds to the support part in the eccentric shaft.

  Further, in the state where the eccentric shaft 35 is supported in such a manner, the disc portion 36b of one shaft member 36 is positioned more inward than the one support base portion 13a and is attached to the one shaft member 36. The connecting member 39 is positioned on the outer side than the one support base portion 13a, and the disk portion 37b of the other shaft member 37 is positioned on the inner side than the other support base portion 13b. That is, in the longitudinal direction, the eccentric shaft 35 is provided between the two support pedestals 13a and 13b constituting the driven support pedestal 13 (the space portion) in the connecting member 39 as the support and the other shaft member 37. The disc portion 37b is in a position. Incidentally, on the side of the driven support 13, the arm portion 22 of the table 20 is attached to the disk portion 36b of one shaft member 36 to support the table 20. Therefore, one of the shaft members The disc portion 36b at 36 functions as the mounting portion 31a described above.

  And since the connecting shaft 38 as an eccentric part is constructed between the connecting member 39 and the disk part 37b as described above, the position where the axis is eccentric with respect to the rotation axis 50 as described above In the longitudinal direction, in the same manner as the connection member 39 and the disk portion 37b, the space portion of the driven support 13 is located. As described above, in the state where the eccentric shaft 35 is supported by the driven support 13, the connecting member 39 as the supporting portion and the disk portion 37b and the connecting shaft 38 as the eccentric portion are shaft portions as a pair of shaft portions. It is located between the parts supported by the bearings 41, 41 in 36a, 37a.

  The balance cylinder 80 as the torque compensation device is connected to the eccentric part of the eccentric shaft as described above, and in the present embodiment, as described above, the connecting shaft 38 as the eccentric part It is located in the space portion of the driven support 13 in the longitudinal direction. Therefore, in the present embodiment, the balance cylinder 80 is also provided so as to be located in the space portion of the driven support 13. That is, the balance cylinder 80 is rotatably supported in the cylinder body 82 with respect to the rack 11 in the frame 10 as described above in a state of being disposed in the space portion, and an eccentric shaft at the tip of the rod 81 It is in a state of being connected to the connecting shaft 38 at 35. In the present embodiment, the connection between the rod 81 and the connecting shaft 38 in the balance cylinder 80 is performed as follows.

  First, in the present embodiment, the connecting shaft 38 is attached to the connecting member 39 in such a manner that the end on one end side thereof is inserted into the connecting member 39, and the connecting shaft 38 is It has a configuration having a flange portion 38a formed in a form adjacent to the portion to be inserted (inserted portion). The connecting shaft 38 is a plurality of screw members (not shown) such as bolts inserted through the flange portion 38a in a state where the end face of the flange portion 38a on the side of the fitting portion abuts on the connecting member 39. , And non-rotatably attached to the connecting member 39.

  Further, a rod end 85 is attached to the tip of the rod 81 in the balance cylinder 80. The rod end 85 has a cylindrical attachment portion 85a into which the end of the rod 81 is inserted, and is attached to the end of the rod 81 in such a manner that the end of the rod 81 is inserted into the attachment portion 85a. ing. Further, in the mounting portion 85a of the rod end 85, the insertion hole passing through the peripheral wall on the tip side of the portion where the rod 81 is inserted is made to coincide with the center when viewed in the direction orthogonal to the axis of the mounting portion 85a. Two are formed at opposing positions. Then, the rod 81 and the connecting shaft 38 are brought into a connected state by inserting the connecting shaft 38 into the insertion hole of the rod end 85 attached to the tip of the rod 81. A bush 90 functioning as a slide bearing is interposed between the rod end 85 and the connecting shaft 38. Thus, the rod end 85 is rotatable relative to the connecting shaft 38.

  Furthermore, in the disk portion 37b of the other shaft member 37 opposed to the connecting member 39 in the longitudinal direction, a ring-shaped positioning member 95 is attached to the end face on the connecting member 39 side. ) Is attached. The mounting position of the positioning member 95 with respect to the disk portion 37b is the center of the connecting member 39 from the center of the shaft portion 37a of the other shaft member 37 to the center of the positioning member 95 in the radial direction of the disk portion 37b. And the center of the portion where the connecting shaft 38 is inserted. Then, as described above, the connecting shaft 38 attached to the connecting member 39 at one end and inserted into the rod end 85 is inserted into the hole of the positioning member 95 at the other end. It is attached to the disc portion 37 b of the other shaft member 37 via the positioning member 95 in a manner as described above.

  As a result, the connecting shaft 38 is bridged between the connecting member 39 and the other shaft member 37 as described above. Also, in that state, the rod end 85 attached to the tip of the rod 81 of the balance cylinder 80 is in a state of being sandwiched by the flange portion 38 a of the connecting shaft 38 and the positioning member 95. As a result, the position of the rod end 85 in the axial direction (longitudinal direction) of the connecting shaft 38 is positioned by the flange portion 38 a of the connecting shaft 38 and the positioning member 95. In the illustrated example, the spacer 100 is interposed between the flange portion 38a of the connecting shaft 38 and the rod end 85 and between the rod end 85 and the positioning member 95 so that the position can be adjusted. . Then, with the configuration as described above, the rod 81 in the balance cylinder 80 and the connecting shaft 38 as the eccentric part are brought into a connected state via the rod end 85.

  As described above, in the inclined indexing apparatus 1 of the present embodiment, the rotary shaft 31 (eccentric shaft 35) on the driven support 13 side is supported by the pair of bearings 41, 41 arranged to be separated in the axial direction. When the table 20 is inclined, the biasing force of the balance cylinder 80 as a torque compensation device acts on the eccentric shaft 35 between the pair of bearings 41, 41. ing. According to such a configuration, the eccentric shaft 35 receives the above-described pressing force as the biasing force of the balance cylinder 80 acts, but the pressing force is that of the pair of bearings 41 and 41. It will act in a dispersed manner on each. Therefore, according to the inclined indexing apparatus having such a configuration, the load applied to one bearing is reduced as compared with the conventional apparatus, and damage such as partial wear and deformation of the bearing is suppressed and the bearing It is possible to prevent the degradation of the indexing accuracy of the tilt indexing device due to the breakage of the

  In the above, one embodiment (example) of the inclined indexing apparatus according to the present invention has been described, but the present invention is not limited to the one described in the above embodiment, and another embodiment as follows It is also possible to implement in a variant).

  (1) With regard to the eccentric shaft as a rotating shaft to which the torque compensation device is connected, in the above embodiment, the eccentric shaft 35 has a pair of independent shaft members 36 and 37 connected by the connecting member 39 and the connecting shaft 38 It has been configured. However, the eccentric shaft of the present invention is not limited to the one configured as such, and may be configured as shown in FIG. 4 and FIG. 5, for example. In addition, about the structure of FIG. 4, FIG. 5, it is as follows in detail. However, also in the examples shown in FIGS. 4 and 5, the supports (the above-mentioned embodiment: driven side support 13) supporting the eccentric shaft are separated from each other in the longitudinal direction and are erected on the rack It shall be comprised by two support stand parts (The said one support stand part 13a and the said other support stand part 13b). Further, in FIG. 4 and FIG. 5, the same reference numerals are given to parts common to the above-mentioned embodiment, and the description thereof will be omitted below.

  In the example shown in FIG. 4, the eccentric shaft 110 is a single shaft member 111 provided in a manner to be bridged between the support base portions 13a and 13b, and the shaft member 111 attached to the shaft member 111 and the attached portion It comprises a connecting member 112 having a radially extending portion 111 and a connecting shaft 113 connecting the connecting member 112 and the balance cylinder 80 as a torque compensation device.

  In the same manner as the shaft members 36 and 37 of the embodiment, the shaft member 111 is a disk portion integrally attached to the shaft portion 111a at one end side of the shaft portion 111a by a screw member (not shown) or the like. It is 111b and has a disk portion 111b that functions as the mounting portion. The shaft portion 111 a of the shaft member 111 has a length corresponding to the range in which the support base 13 is present in the longitudinal direction. The shaft member 111 is in a state in which the one end side portion of the shaft portion 111a is inserted into the one support base portion 13a and the other end side portion is inserted into the other support base portion 13b. The respective end portions are rotatably supported on the support base 13 in a manner supported by bearings 41 and 41 incorporated in the corresponding support bases 13a and 13b. Moreover, in the state in which the shaft member 111 is supported by the support base 13 as described above, the disk portion 111b is positioned inside the one support base portion 13a.

  Further, the connecting member 112 is a fixing portion 112a which is a portion attached to the shaft member 111 described above, and has a through hole into which the shaft portion 111a of the shaft member 111 can be fitted, and the fixing portion 112a An integrally formed plate-like connecting portion 112b, which is formed so as to turn the thickness direction in the penetrating direction of the through hole and extend in the radial direction of the through hole from the outer peripheral surface of the fixed portion 112a. And 112b. The connecting portion 112b may have, for example, a disk shape existing over the outer periphery of the fixed portion 112a, but in the illustrated example, the portion extending in the radial direction from a part of the outer periphery of the fixed portion 112a It has become. Further, in the connecting portion 112b, a through hole penetrating in the thickness direction is formed at a position separated from the outer periphery of the fixing portion 112a.

  The connecting member 112 is assembled to the shaft member 111 in such a manner that the shaft member 111 is inserted through the through hole in the fixing portion 112a, and attached to the shaft member 111 so as not to be relatively rotatable by fixing means such as a screw member. It is done. However, the attachment position of the shaft member 111 in the axial direction is determined as follows: in the state where the shaft member 111 is bridged between the support bases 13a and 13b as described above, the connecting member 112 is between the two support bases 13a and 13b. It is located in the That is, the connecting member 112 is attached to the shaft member 111 between both ends (the one end and the other end) of the shaft member 111 supported by the bearings 41, 41.

  Further, the connecting shaft 113 is attached to the connecting portion 112 b of the connecting member 112 in such a manner as to be inserted into the through hole formed in the connecting portion 112 b. The connecting shaft 113 has a flange portion 113a at its middle portion, and a portion on one end side of the flange portion 113a is inserted into the through hole, and the end surface of the flange portion 113a is connected to the connecting portion 112b. It is attached with respect to the connection part 112b (connection member 112) in the state contact | abutted.

  Furthermore, in the eccentric shaft 110 configured by such a shaft member 111, the connecting member 112, and the connecting shaft 113, the eccentric shaft 110 is a support base 13 in the shaft member 111 (two support bases 13a, 13b) The balance cylinder 80 provided in the same manner as in the above embodiment connects the rod 81 of the balance cylinder 80 and the connecting shaft 113 via the rod end 120 attached to the end of the rod 81 while being supported by the It is connected with. The rod end 120 has the same configuration as that of the embodiment described above, and the portion on the other end side of the flange portion 113a of the connecting shaft 113 is inserted into the insertion hole formed in the rod end 120. It is connected to the connecting shaft 113.

  Therefore, in the eccentric shaft 110 having such a configuration, the two end portions of the shaft member 111 (portions supported by the support bases 13a, 13b via the bearings 41, 41) are a pair of shafts in the eccentric shaft of the present invention. The connecting shaft 113 corresponds to an eccentric portion. Further, a portion excluding the both end portions of the shaft portion 111 a in the shaft member 111 and the connecting member 112 correspond to a support portion. As described above, the support portion in the eccentric shaft according to the present invention is not limited to the one formed in a disk shape as in the above-described embodiment, but may be any member having a portion extending in the radial direction from the shaft portion.

  Further, in the example shown in FIG. 5, the eccentric shaft 130 has a configuration in the form of a crankshaft, and a single shaft member 131 includes a pair of shaft portions, an eccentric portion, and a support portion. ing.

  Specifically, the eccentric shaft 130 is both ends of the single shaft member 131, and each end is supported by bearings 41 and 41 with respect to the support bases 13a and 13b of the support base 13 (each end Parts are equivalent to the shaft parts) are not continuous in the axial direction and are separated from each other. In addition, the eccentric shaft 130 has its both ends (shafts 131a, 131a) continuously formed on the end edges of the respective shafts 131a, 131a facing each other and the radius of the shafts 131a, 131a. The pair of support portions 133, 133 extending in the direction and the eccentric portion 132 connecting the pair of support portions 133, 133 at a position eccentric from the axis of the shaft portions 131a, 131a The shaft portions 131a and 131a, the pair of support portions 133 and 133, and the eccentric portion 132 are integrally formed. In addition, the eccentric shaft 130 configured in such a manner has a disk portion 131 b functioning as the attachment portion at an end portion on one side of the pair of shaft portions 131 a and 131 a on the opposite side to the support portion.

  And, in this example, in the state where both shaft parts 131a and 131a are supported by the support bases 13a and 13b of the support base 13 with respect to the eccentric shaft 130 configured as such, in the same manner as the above embodiment. The balance cylinder 80 is connected to the eccentric portion 132 via the rod end 140.

  In addition, about the connection structure of the eccentric part 132 and the balance cylinder 80 via the rod end 140, in this example, the eccentric part 132 is formed as a small diameter attachment shaft 132a near the center in the longitudinal direction. ing. On the other hand, the rod end 140 is a cylindrical member formed such that the portion on the tip end side of the cylindrical attachment portion 140b into which the tip end of the rod 81 of the balance cylinder 80 is inserted has the axis orthogonal to the axis of the attachment portion 140b. The fixed portion 140a is formed as a fixed portion 140a that has a half structure. However, the cylindrical fixing portion 140 a has an inner diameter larger than the attachment shaft 132 a of the eccentric portion 132. The rod end 140 is in a state in which the mounting shaft 132a of the eccentric portion 132 is inserted through the fixing portion 140a, and a bush 150 (slide bearing having a half structure between the fixing portion 140a and the mounting shaft 132a) ) Is attached to the eccentric portion 132 of the eccentric shaft 130. Then, the rod 81 of the balance cylinder 80 is inserted into the cylindrical attachment portion 140b of the rod end 140, whereby the eccentric portion 132 (eccentric shaft 130) and the balance cylinder 80 are connected. It will be in the state.

  (2) In the example described above, the inclined indexing apparatus based on the premise is configured such that the drive unit is provided only on one of the pair of supports, but the present invention is based on that The inclined indexing device is not limited to such a configuration, and may have a configuration in which the drive device is provided on both of the pair of supports. In that case, the torque compensation device is provided in a form attached to the support on which the drive device is provided.

  As described above, the present invention is limited to the case where the present invention is applied to the inclined indexing apparatus in which the torque compensation device is provided on the side of the support (the driven side support 13) where the drive device is not provided. The present invention is also applicable to an inclined indexing device in which a torque compensation device is provided on the side of a support (drive side support 12) provided with a drive device. Therefore, in the inclined indexing device on which the present invention is premised, in a device in which the drive device is provided only in one of the pair of supports as in the above-described embodiment etc., the torque compensation device is provided on the drive side support May be provided.

  Further, the inclined indexing device on which the present invention is premised is not limited to the one in which the torque compensation device is provided only on one side of the pair of supports as in the above embodiment etc. It may be provided in a form attached to. And in this invention, it is a rotating shaft to which the torque compensation device is connected, and a rotating shaft rotatably supported by a support stand via a bearing is constituted as an above-mentioned eccentric shaft.

  (3) The torque compensation device employed in the inclined indexing device on which the present invention is premised is not limited to the balance cylinder 80 as described above, but acts on the eccentric shaft when the table is in the inclined state. It may be of any configuration as long as it can apply a rotational torque for compensating an unbalanced torque to the eccentric shaft, as described in, for example, Japanese Patent Application Laid-Open No. 2009-255266 (prior art document) It may be of the above configuration.

  Specifically, the torque compensation device in the configuration of the prior art document gives rotational motion to the gear (second gear) meshing with the gear (first gear) on the rotary shaft side and the second gear It consists of a drive unit. Then, the rotational force is given to the second gear by the driving device in the torque compensation device, and the rotational force acts on the first gear on the rotation shaft side that meshes with the second gear, A rotational torque acts on the rotational shaft to compensate for the unbalanced torque. Incidentally, the drive device for imparting rotational motion to the second gear may be configured using a fluid pressure cylinder or a weight as disclosed in the prior art reference, or may be a motor such as a torque motor. It may be.

  In the configuration, the rotation shaft in the present invention refers to a combination of a single shaft member and a first gear mounted non-rotatably with respect to the shaft member, and the rotation shaft It becomes an eccentric shaft in the invention. However, in the present invention, unlike the configuration of the prior art document, the first gear in the eccentric shaft is attached to the axial member near the center in the axial direction. In the eccentric shaft, the portion of the shaft member supported by the support corresponds to the shaft portion in the present invention, and the portion (tooth portion) in the first gear meshed with the second gear is the eccentric portion. Equivalent to. Further, a portion between the shaft portion and the tooth portion in the eccentric shaft corresponds to a support portion.

  The torque compensation device may also be configured as a balance weight attached to the eccentric shaft. Specifically, the torque compensation device is configured such that the weight is supported by a wire rope and the weight is connected to the eccentric shaft through the wire rope or the like as disclosed in the prior art. The other end of the wire rope connected to the weight may be directly connected to the eccentric part of the eccentric shaft.

  In addition, a shaft member that makes up a part of an eccentric shaft, with respect to the shaft member supported by the support base (support base portion) at each of its both ends, by a bracket etc. By mounting the support shaft in such a way as to extend in the radial direction of the shaft member and attaching a weight to the tip of the support shaft (the end opposite to the shaft member side), the unbalanced torque in the inclined state of the table is It is good also as composition compensated. In such a configuration, the weight itself functions as a torque compensation device. The eccentric shaft is a combination of the shaft member and the support shaft, and both ends of the shaft member supported by the support base correspond to a pair of shaft portions and a portion of the support shaft to which the weight is attached is It corresponds to an eccentric part, and the part between the axial part and the eccentric part corresponds to a support part.

  The present invention is not limited to any of the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Inclined indexing apparatus 10 Frame 11 Mounting base 12, 13 Support stand 13a, 13b Support stand part 20 Table 21 Base part 22 Arm part 30, 31 Rotary shaft 30a, 31a Mounting part 35 Eccentric shaft 36 Shaft member 36a Shaft part 36b Disc part 37 shaft member 37a shaft portion 37b disk portion 38 connecting shaft 39 connecting member 40, 41 bearing 50 rotational axis 60 driving device 70 clamping device 80 balance cylinder 110 eccentric shaft 111 shaft member 112 connecting member 113 connecting shaft 130 eccentric shaft 131 shaft member 132 Eccentric part 133 Support part

Claims (1)

A frame and a frame having a pair of supports standing on the rack and spaced apart from each other;
A pair of rotary shafts provided in a pair in the form of being supported by each of the pair of supports, the pair of rotary shafts rotatably supported via bearings with respect to the corresponding supports;
A table having a base portion on which a workpiece is placed and a pair of arm portions supporting the base portion, the table supported by the pair of rotation shafts in the pair of arm portions;
A driving device provided on at least one of the pair of supports, which rotationally drives the table via the rotation shaft;
And a torque compensation device that compensates for unbalance torque applied to the rotating shaft when the table is tilted.
At least one of the pair of rotation shafts is a pair of shaft portions, and when viewed in the axial direction of the shaft portions, the axis centers of the two coincide and the pair of shaft portions provided at intervals in the axial direction And an eccentric portion disposed between the pair of shaft portions in the axial direction and provided at a position eccentric to the axis of the shaft portion, and a support portion connecting the pair of shaft portions and the eccentric portion Configured as an eccentric shaft,
The eccentric shaft is supported by the corresponding support via the bearings at each of the pair of shaft portions,
The tilt index device characterized in that the torque compensation device is connected to the eccentric portion of the eccentric shaft which is the rotation shaft.

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