JP3220728U - Rotary table device - Google Patents

Abstract

[PROBLEMS] To provide a rotary table device installed on a machine tool in which the work efficiency of cleaning is improved.
A rotary table device includes a rotary table, a C-axis drive unit, a support base, and a cover. The rotary table can be mounted with a jig 200 for holding the workpiece W. The C-axis drive unit rotates the rotary table about the first axis 111. The support supports the C-axis drive unit. The cover is detachably fixed to the support at a position covering the support from above, includes a table insertion hole 440 for inserting the rotating table, and is formed by the first cover 410 and the second cover 420 which are separate from each other. Ru. The first cover is provided with a first table insertion hole forming a part of the table insertion hole, and the second cover is provided with a second table insertion hole forming the other part of the table insertion hole.
[Selected figure] Figure 2

Description

  The present invention relates to a rotary table apparatus installed in a machine tool.

  BACKGROUND Conventionally, a rotary table device installed in a machine tool is known. For example, Patent Document 1 discloses a workpiece support device which is an example of a rotary table device. The workpiece support device includes a C-axis drive unit, a rotation base, and an A-axis cover. The C-axis drive rotatably supports the rotating table. The rotating table can be mounted with a gripping mechanism for gripping a workpiece. When the machine tool processes a workpiece, the rotary table rotates integrally with the gripping mechanism and the workpiece by the drive of the C-axis drive unit. The A-axis cover has an insertion hole through which the rotation table is inserted. The A-axis cover covers the C-axis drive.

Unexamined-Japanese-Patent No. 2016-182662

  There are times when chips generated with the processing of the work by the machine tool get in between the insertion hole of the A-axis cover and the rotating table. At this time, the operator needs to remove the A-axis cover from the C-axis drive in order to clean the C-axis drive, the rotating table, and the A-axis cover. However, in the above-described rotary table device, when the gripping mechanism can not pass through the insertion hole, it is necessary to remove the gripping mechanism from the rotating table in advance, so that the work efficiency of the cleaning may be deteriorated.

  An object of the present invention is to provide a rotary table apparatus having an improved cleaning efficiency.

  The rotary table apparatus according to the present invention comprises a rotary table capable of mounting a jig for holding a work, a drive unit for rotationally driving the rotary table, a support base for supporting the drive unit, and a table for inserting the rotary table. A rotary table device having an insertion hole and removably fixed to the support table at a position covering the support table, wherein the cover is a part of the table insertion hole. A first cover having a first table insertion hole for forming the second table, and a second cover formed separately from the first cover, and having a second table insertion hole for forming the other portion of the table insertion hole; It is characterized by having.

  According to the above configuration, the first cover and the second cover can be separated from the support along the direction orthogonal to the first axis, which is the rotation center of the rotary table when it is rotated with the drive of the drive unit. That is, the cover does not have to be removed from the support along the first axis. Therefore, the operator can remove the cover from the support without removing the jig from the rotary table. The cover is easy to remove from the support. Therefore, the turntable device can improve the work efficiency of cleaning.

  In the rotary table device, the rotary table, the drive unit, and the support are integrally integrated around a second axis orthogonal to a first axis serving as a rotation center of the rotary table when rotated by the drive unit. The first table insertion hole forms a portion on one side of the table insertion hole in the orthogonal direction orthogonal to each of the first axis and the second axis, and the second table insertion hole The hole may form a portion on the other side of the table insertion hole in the orthogonal direction. The first cover and the second cover can be removed from the support along the orthogonal direction, respectively, so that the cover can be more easily removed from the support.

  In the rotary table device, the first cover is at a position shifted from the table insertion hole in a direction in which the second axis extends, and a covering portion that overlaps the direction in which the first axis extends with respect to the second cover. May be provided. Since the covering portion overlaps the second cover in the direction in which the first axis extends, chips are less likely to enter between the first cover and the second cover when the workpiece is machined by the machine tool. Therefore, the rotary table device can suppress the accumulation of chips on the support.

  In the rotary table device, the first cover includes a first plate-like portion extending orthogonal to the direction in which the first axis extends, and the second cover is the first plate in the direction in which the first axis extends A second plate-like portion which is in the same position as the first portion and extends parallel to the first plate-like portion, and the covering portion is an end face of the first plate-like portion in a direction from the support to the rotary table , And may project to the other side in the orthogonal direction. Since the covering portion covers the space between the first plate-like portion and the second plate-like portion, the chips become more difficult to enter between the first plate-like portion and the second plate-like portion. Therefore, the rotary table device can further suppress the accumulation of chips on the support.

  In the rotary table device, the covering portion may project from the end face of the first plate-like portion to the other side in a direction in which the second axis extends. At a position shifted from the table insertion hole in the direction in which the second axis extends, the covering portion covers between the first plate-like portion and the second plate-like portion along the direction in which the second axis extends, so the chips This makes it more difficult to enter between the first plate-like portion and the second plate-like portion.

FIG. 1 is a perspective view of a machine tool 1; FIG. 7 is a perspective view of a work support device 8; FIG. 5 is a cross-sectional view of a C-axis drive unit 50; FIG. 16 is a perspective view of the right connection cover 340. FIG. 10 is a perspective view of a left connection cover 310. FIG. 10 is a perspective view of a cover 400. FIG. 10 is a perspective view of a first cover 410. FIG. 18 is a perspective view of a second cover 420. The left view of the 1st cover 610 and the 2nd cover 620.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, upper and lower, right and left, and front and back indicated by arrows in the drawings are used. The left-right direction, the front-rear direction, and the up-down direction of the machine tool 1 are the X-axis direction, the Y-axis direction, and the Z-axis direction of the machine tool 1, respectively.

  The structure of the machine tool 1 will be described with reference to FIG. The machine tool 1 includes a base 2, a column 5, a Y-axis moving mechanism (not shown), an X-axis moving mechanism (not shown), a Z-axis moving mechanism (not shown), a spindle head 6, a spindle (not shown), a workpiece A support device 8, a tool changer 9 and the like are provided.

  The base 2 includes a gantry 11, a spindle base 12, a right work base 13, a left work base 14 and the like. The gantry 11 is a substantially rectangular parallelepiped long structure in the front-rear direction. The spindle base 12 is formed in a substantially rectangular parallelepiped shape that is long in the front-rear direction, and is provided on the top rear of the gantry 11. The right work base 13 is provided on the upper right side of the upper surface of the gantry 11. The left work base 14 is provided on the upper left of the top surface of the gantry 11. The right work base 13 and the left work base 14 support the work support device 8.

  A Y-axis moving mechanism is provided on the upper surface of the spindle base 12, and a pair of Y-axis rails 16 (FIG. 1 shows only the right Y-axis rail 16), Y-axis ball screw (not shown), Y-axis motor (not shown) Equipped with A pair of Y-axis rails 16 and Y-axis ball screws extend in the Y-axis direction. The pair of Y-axis rails 16 guide the movable body 15 in the Y-axis direction on the upper surface. The movable body 15 is formed in a substantially flat plate shape, and is provided with a nut (not shown) on the bottom outer surface. The nut is screwed into the Y-axis ball screw. When the Y-axis motor rotates the Y-axis ball screw, the moving body 15 moves along with the nut along the pair of Y-axis rails 16. Therefore, the Y-axis moving mechanism movably supports the moving body 15 in the Y-axis direction.

  The X-axis moving mechanism is provided on the upper surface of the moving body 15, and includes a pair of X-axis rails (not shown), an X-axis ball screw (not shown), an X-axis motor (not shown) and the like. The X-axis rail and the X-axis ball screw extend in the X-axis direction. The column 5 extends vertically and is provided on the upper surface of the movable body 15. The column 5 has a nut (not shown) at its bottom. The nut is screwed into the X-axis ball screw. When the X-axis motor rotates the X-axis ball screw, the column 5 moves along with the nut along a pair of X-axis rails. Therefore, the X-axis moving mechanism supports the column 5 movably in the X-axis direction. Therefore, the column 5 is movable in the X-axis direction and the Y-axis direction on the base 2 by the Y-axis moving mechanism, the moving body 15, and the X-axis moving mechanism.

  The Z-axis moving mechanism is provided on the front surface of the column 5, and includes a pair of Z-axis rails (not shown), Z-axis ball screws (not shown), a Z-axis motor (not shown), and the like. The Z-axis rail and the Z-axis ball screw extend in the Z-axis direction. The spindle head 6 is provided with a nut (not shown) on its back surface. The nut is screwed into the Z-axis ball screw. The Z-axis motor is fixed to a bearing (not shown) at the upper end of the Z-axis ball screw. When the Z-axis motor rotates the Z-axis ball screw, the spindle head 6 moves along the pair of Z-axis rails. Therefore, the Z-axis moving mechanism supports the spindle head 6 movably in the Z-axis direction.

  A spindle (not shown) is provided inside the spindle head 6, and a tool mounting hole (not shown) is provided at the lower portion of the spindle head 6. The tool mounting hole mounts a tool. The spindle is rotated by a spindle motor 17 provided above the spindle head 6.

  The work supporting device 8 is disposed on the front side of the upper surface of the gantry 11 and is fixed and supported on the upper surfaces of the right work base 13 and the left work base 14 respectively. The workpiece support device 8 rotatably holds the workpiece W. The workpiece W held by the workpiece support device 8 is rotatable about the first axis 111 (see FIG. 2) and rotatable about the second axis 112 (see FIG. 2). The first axis 111 extends in the vertical direction in FIG. 2, and the second axis 112 extends parallel to the X-axis direction. The direction in which the first axis 111 extends changes in accordance with the rotation of the workpiece W about the second axis 112. As the workpiece W rotates about the second axis 112, the workpiece support device 8 can tilt the workpiece W in an arbitrary direction with respect to the tool mounted on the spindle. The specific structure of the workpiece support device 8 will be described later.

  The tool changer 9 includes a tool magazine (not shown) and a protective cover 9A. The protective cover 9A covers and protects the tool magazine. The tool magazine has a substantially annular shape surrounding the column 5 and the spindle head 6. The tool magazine includes a plurality of pots (not shown), a magazine motor (not shown), and the like. The pot is detachably mounted with a tool. By driving the magazine motor, the plurality of pots move along the shape of the tool magazine. The tool change position is the position of the pot located at the bottom of the tool magazine. The tool changer 9 changes the tool held by the pot with the tool currently mounted on the spindle during the lifting and lowering operation of the spindle head 6.

  The specific structure of the workpiece support device 8 will be described with reference to FIG. The structure will be described below with reference to the posture of the workpiece support device 8 in which the first shaft 111 extends in the vertical direction.

  The work support device 8 includes a left support mechanism 27, a left support 23, a right drive mechanism 28, a right support 22, a C-axis drive unit 50, and a rotary cylinder 90. The left side support mechanism 27 is a column having a predetermined thickness in the left-right direction, and extends in the up-down direction. The bottom of the left side support mechanism 27 is fixed to the top surface of the left work base 14. The left support mechanism 27 rotatably supports the left support shaft 31. The axial center of the left support shaft 31 coincides with the second shaft 112. The left support 23 is located to the right of the left support mechanism 27. The left support 23 extends from the upper left to the lower right and further extends to the right. The left support 23 is connected to the left support shaft 31.

  The right side drive mechanism unit 28 includes cover portions 33 and 34. The cover 33 is formed in a substantially rectangular parallelepiped shape and covers the upper half periphery of the right drive mechanism 28. The cover portion 34 is connected to the lower portion of the cover portion 33 and covers the lower half of the right drive mechanism portion 28. The cover parts 33 and 34 store the right side support part (not shown), a reduction gear (not shown), an A-axis motor (not shown) and the like inside. The bottom of the right side support portion is fixed to the top surface of the right side work base 13. The right side support portion rotatably supports a right support shaft (not shown) protruding leftward through a circular hole 35 provided across the left side surface of each of the cover portions 33 and 34, and Integrally holds the speed reducer and A-axis motor. The axis of the right support axis coincides with the second axis 112. The right support 22 is located to the left of the right drive mechanism 28. The right support 22 extends from the upper right to the lower left and further extends to the left. The right support 22 is connected to the right support shaft. In the following description, when the left side support 23 and the right side support 22 are collectively referred to as “support 20”.

  The right support shaft and the output shaft of the A-axis motor are connected to each other via a reduction gear. The reduction gear is a mechanical device that reduces the rotational speed of the power with gears or the like and outputs the reduced power, and can obtain a torque proportional to the speed reduction ratio as an output. Therefore, when the output shaft of the A-axis motor rotates, the right support shaft rotates at a lower speed than the A-axis motor via the reduction gear. At this time, the support 20 and the left support shaft 31 rotate around the second shaft 112 integrally with the right support shaft.

  The C-axis drive unit 50 is provided on the lower surface of the support 20. The upper end portion of the C-axis drive unit 50 is connected to the rotary table 40. The rotary table 40 has a substantially cylindrical shape whose axial direction is in the vertical direction, and the jig 200 can be attached to the upper surface. The jig 200 can mount the work W. The rotary table 40 is rotated about the first shaft 111 by the drive of a C-axis motor 60 (see FIG. 3) described later of the C-axis drive unit 50. The rotating cylinder 90 is fixed to the lower part of the C-axis drive unit 50. The rotating cylinder 90 is a drive source of the jig 200 and drives the jig 200 by hydraulic pressure.

  The structure of the C-axis drive unit 50 will be described with reference to FIG. The C-axis drive unit 50 includes a housing 51, a C-axis motor 60, a rotating shaft 70, a bottom plate 57, a spindle cover 85, and the like. The housing 51 is formed in a cylindrical shape with a bottom, and includes a body 52, a first bearing holder 53, an upper plate 54, a second bearing holder 55, a bottom plate 57, and the like.

  The body 52 is formed in a substantially cylindrical shape extending in the vertical direction. The body portion 52 fixes the stator 61 of the C-axis motor 60 on the inner circumferential surface. The rotor 62 of the C-axis motor 60 is fixed to the outer peripheral surface of the rotating shaft 70 facing the stator 61. The rotor 62 is disposed inside the stator 61. The rotating shaft 70 is an axis coaxial with the first shaft 111 and rotates with the rotor 62. The body portion 52 fixes the upper plate 54 at the upper end portion via the first bearing holder 53. The body portion 52 fixes the bottom plate 57 at the lower end portion via the second bearing holder 55.

  The first bearing holder 53 has a flanged cylindrical shape and is coaxially fixed to the upper end of the body 52. The first bearing holder 53 includes a cylindrical portion 53A and a collar portion 53B. The lower surface outer peripheral edge portion of the collar portion 53B is fixed to the upper end portion of the body portion 52. The cylindrical portion 53A is provided with a locking portion 531 at the inner peripheral edge portion of a shaft hole (not shown) at the upper end portion. The locking portion 531 is formed in an annular shape projecting radially inward, and has a shaft hole into which the rotation shaft 70 is inserted substantially at the center. The cylindrical portion 53A has two annular upper bearings 72, 73 inserted therein. The upper bearing 72 located on the upper side is locked to the locking portion 531. The upper bearings 72 and 73 are fixed from the lower side by an annular lock nut 78 fastened to the rotating shaft 70. The upper bearings 72 and 73 insert the upper end side of the rotating shaft 70 inside. Therefore, the upper bearings 72, 73 rotatably support the rotating shaft 70.

  The upper plate 54 is formed in a bottomed cylindrical shape with a flange, and the cylindrical portion 53A of the first bearing holder 53 is covered from above with the open side directed downward and fixed to the outer peripheral edge of the upper surface of the collar 53B. Do. The upper plate 54 includes an upper bottom portion 54A, a cylindrical portion 54B, and a collar portion 54C. The cylindrical portion 54B is formed in a cylindrical shape having substantially the same diameter as the body portion 52 and extends in the vertical direction. The upper bottom portion 54A is provided at the upper end portion of the cylindrical portion 54B, and is formed in an annular shape having an axial hole at substantially the center. The upper bottom portion 54A is fixed to the lower surface of the support 20. That is, the C-axis drive unit 50 is supported by the support 20. The first bearing holder 53 may be fixed to the lower surface of the support 20. The collar portion 54C extends radially outward from the lower end portion of the cylindrical portion 54B in a bowl shape. The rotary table 40 has a substantially cylindrical shape coaxial with the rotation shaft 70. The rotary table 40 is fixed to the upper end portion of the rotary shaft 70 by means of six screws 95 (only one is shown in FIG. 3) via the shaft hole of the upper bottom portion 54A. Therefore, the rotary table 40 rotates integrally with the rotary shaft 70. The lower surface outer peripheral edge of the flange portion 54C protrudes downward, and abuts on and fixes the upper surface outer peripheral edge of the flange portion 53B of the first bearing holder 53.

  The housing 51 includes the brake mechanism 100 between the inner peripheral surface of the upper plate 54 and the outer peripheral surface of the first bearing holder 53. The brake mechanism 100 includes a braking piece 101, a brake plate 102, a moving space 103, a piston 104, and the like. The braking piece 101 is disposed on the lower surface side of the upper bottom portion 54A of the upper plate 54, and is formed in an annular shape having an axial hole into which the rotating shaft 70 is inserted. The brake plate 102 is disposed on the lower surface side of the braking piece 101 and formed in a disk shape having an axial hole into which the rotation shaft 70 is inserted. The brake plate 102 is fixed to the upper surface of the flange portion 70A of the rotating shaft 70 with a screw 99. The collar portion 70A extends radially outward from the outer peripheral surface of the upper end portion of the rotating shaft 70. The moving space 103 is formed between the lower surface of the brake plate 102 and the upper surface of the flange 53 B of the first bearing holder 53.

  The piston 104 is movably disposed in the moving space 103 in the vertical direction. The piston 104 is formed in a flanged cylindrical shape, and includes a cylindrical portion 104A and a collar portion 104B. The cylindrical portion 104A inserts the rotary shaft 70 and the cylindrical portion 53A of the first bearing holder 53 inside. The collar portion 104B extends radially outward from the lower end portion of the cylindrical portion 104A. The lower surface of the flange portion 104B faces the upper surface of the flange portion 53B of the first bearing holder 53, and a brake pressure chamber 107 is formed between the lower surface and the upper surface. The upper surface of the flange portion 104B faces the lower surface of the flange portion 54C of the upper plate 54, and a brake releasing pressure chamber 108 is formed between the upper surface and the lower surface.

  The work support device 8 can introduce air from a compressor (not shown) into the first flow passage 532 provided in the flange portion 53B of the first bearing holder 53 and press the air into the brake pressure chamber 107. When the brake pressure chamber 107 is pressurized, the piston 104 ascends and presses the brake plate 102 rotating with the rotation shaft 70 against the braking piece 101. Since the brake plate 102 frictionally stops between the braking piece 101 and the piston 104, the rotating shaft 70 stops. The work support device 8 introduces air from a compressor (not shown) into a second flow passage (not shown) provided in the flange portion 53B of the first bearing holder 53 and applies pressure to the brake releasing pressure chamber 108. it can. When pressure is applied to the brake release pressure chamber 108, the piston 104 is lowered to release the brake on the brake plate 102. Therefore, the work support device 8 can perform the brake operation and the brake release operation by moving the piston 104 up and down by the pressurization to the brake pressure chamber 107 or the brake release pressure chamber 108.

  The second bearing holder 55 is formed in a flanged cylindrical shape and coaxially fixed to the lower end portion of the body portion 52. The second bearing holder 55 includes a cylindrical portion 55A and a collar 55B. The cylindrical portion 53A extends in the vertical direction, and is formed in a cylindrical shape having substantially the same diameter as the cylindrical portion 53A of the first bearing holder 53. The collar portion 55B extends radially outward from the lower end portion of the cylindrical portion 55A in the shape of a collar. The upper surface outer peripheral edge portion of the collar portion 55B abuts on the lower end portion of the body portion 52 and is fixed. The cylindrical portion 55A is provided with a locking portion 551 at the inner peripheral edge portion of the shaft hole at the upper end portion. The locking portion 551 is formed in an annular shape projecting radially inward, and has a shaft hole into which the rotation shaft 70 is inserted substantially at the center. The cylindrical portion 55A has an annular lower bearing 74 inserted therein. The outer ring 74 B of the lower bearing 74 is locked to the locking portion 551. The lower bearing 74 inserts the rotating shaft 70 inside and rotatably supports it.

  The bottom plate 57 is formed in a substantially annular shape, and is fixed to the lower end portion of the housing portion 51 by a screw 97. The bottom plate 57 is provided with an axial hole 571 substantially at the center. The spindle cover 85 is disposed inside the shaft hole 571. The spindle cover 85 is provided with a mounting portion 851 on the lower end surface. The attachment portion 851 is a portion that abuts on the upper surface of the rotary cylinder 90 and is detachably attached by a screw (not shown). The rotating cylinder 90 is attached to the lower end of the rotating shaft 70 via the spindle cover 85. Therefore, the rotating cylinder 90 rotates integrally with the rotating shaft 70. The rotary cylinder 90 is provided with a pipe (not shown) for supplying driving oil to a jig 200 attached to the upper surface of the rotary table 40. The pipe is connected to the jig 200 through the shaft hole of the rotary shaft 70 and the shaft hole of the rotary table 40.

  As shown in FIGS. 2 and 4, the workpiece support device 8 further includes a right connection cover 340. The right connection cover 340 includes a right contact plate 343, a right inclined plate 341, and a right connection plate 363. The right contact plate 343 opposes and contacts the upper end of the right support 22. The right contact plate 343 includes two right insertion holes 345 aligned in the front-rear direction. Each of the two right insertion holes 345 faces a right fastening hole (not shown) arranged in the front-rear direction at the upper end of the right support 22. A screw 349 is inserted into each right insertion hole 345, and the screw 349 inserted into each right insertion hole 345 is fastened to each right fastening hole. Therefore, the right contact plate 343 can be fixed to the right support 22. The right inclined plate 341 extends from the left end of the right inclined plate 341 obliquely downward to the left. The right connecting plate 363 protrudes leftward from the lower end portion of the right inclined plate 341 and extends in the front-rear direction. The right connecting plate 363 is in contact with the right support 22 from above the portion extending in the left-right direction. The right connecting plate 363 is provided with four right round holes 365 aligned in the front-rear direction. The four right round holes 365 respectively face the right screw holes (not shown) arranged in the front-rear direction on the right support 22 in the front-rear direction.

  As shown in FIGS. 2 and 5, the workpiece support device 8 further includes a left connection cover 310. The left connection cover 310 includes a left contact plate 313, a left inclined plate 311, and a left connection plate 323. The left contact plate 313 opposes and contacts the upper end portion of the left support 23. The left contact plate 313 has two left insertion holes 315 aligned in the front-rear direction. The two left insertion holes 315 respectively face left fastening holes (not shown) provided in the front-rear direction at the upper end portion of the left support 23. The screws 319 are respectively inserted into the two left insertion holes 315, and the screws 319 inserted into the left insertion holes 315 are fastened to the left fastening holes. Therefore, the left contact plate 313 can be fixed to the left support 23. The left inclined plate 311 extends from the right end of the left contact plate 313 obliquely downward to the right. The left connecting plate 323 protrudes rightward from the lower end portion of the left inclined plate 311 and extends in the front-rear direction. The left connection plate 323 is opposed to and contacts the substantially central portion in the left-right direction of the left support 23 from above. The left connecting plate 323 has four left round holes 325 aligned in the front-rear direction. The four left round holes 325 respectively face left screw holes (not shown) aligned in the front-rear direction on the left side support 23.

  As shown in FIGS. 2 and 6, the workpiece support device 8 further includes a cover 400. The cover 400 is a plate-like member removably fixed to the upper surface of the support 20 by screws 913 and 914 described later, and covers a part of the support 20 from the upper side. The cover 400 includes a table insertion hole 440 through which the rotary table 40 is inserted. The table insertion hole 440 is a circular hole opening in the vertical direction, and the rotary table 40 protrudes upward from the table insertion hole 440. That is, the jig 200 mounted on the rotary table 40 is located above the table insertion hole 440. The rotary table 40 includes a first cover 410 and a second cover 420.

  As shown in FIGS. 6 and 7, the first cover 410 includes a first plate-like portion 415, two right insertion holes 413, two left insertion holes 414, and a covering portion 417. The first plate-like portion 415 extends in the left-right direction and the front-rear direction. That is, the first plate-like portion 415 extends perpendicularly to the vertical direction. The first plate-like portion 415 contacts the right connection plate 363 of the right connection cover 340 and the left connection plate 323 of the left connection cover 310 from above. The two right insertion holes 413 and the two left insertion holes 414 are circular holes vertically penetrating the first plate-like portion 415. Two right insertion holes 413 are provided in the front-rear direction at the rear end of the first plate-like portion 415, and two left insertion holes 414 are provided in the front-rear direction at the rear end of the first plate-like portion. The two right insertion holes 413 respectively face the two rear right round holes 365 in the right connection cover 340 from above, and the two left insertion holes 414 each lie in the two rear left round holes 325 of the left connection cover 310. Opposite from above. Screws 913 (see FIG. 2) inserted through the right insertion hole 413 and the right round hole 365 are fastened to the two above-mentioned right screw holes on the rear side of the right support 22 and are inserted into the left insertion hole 414 and the left round hole 325 The inserted screws 914 (see FIG. 2) are fastened to the above-mentioned two left screw holes on the rear side of the left support 23. Therefore, the first cover 410 can be removably fixed to the support 20 via the right connection cover 340 and the left connection cover 310.

  The front end of the first plate-like portion 415 is formed by a left front end 448, a right front end 443 and a first table insertion hole 441. The left front end 448 and the right front end 443 linearly extend in the left-right direction. The left front end 448 and the right front end 443 are disposed at the same longitudinal position. The first table insertion hole 441 is located between the left front end 448 and the right front end 443. That is, the first table insertion hole 441 is offset from the left front end 448 and the right front end 443 in the left-right direction. The first table insertion hole 441 has a semicircular arc shape that forms a rear portion of the table insertion hole 440. In other words, the first table insertion hole 441 forms a part of the table insertion hole 440 in the front-rear direction.

  The covering portion 417 is a plate-like member having a thickness in the vertical direction, and is provided above each of the left front end 448 and the right front end 443. The covering portion 417 protrudes from the end surface 415A, which is the upper end surface of the first plate-like portion 415, to the front side of the left front end 448 and the right front end 443. The covering portion 417 is provided along the left and right direction of the left front end 448 and the right front end 443. The covering portion 417 in this example is formed separately from the first plate-like portion 415, and is fixed to the end surface 415A by welding.

  As shown in FIGS. 6 and 8, the second cover 420 includes a second plate-like portion 425, two right insertion holes 423, and two left insertion holes 424. The second plate-like portion 425 extends in the left-right direction and the front-rear direction. The second plate-like portion 425 is at the same vertical position as the first plate-like portion 415. The two right insertion holes 423 and the two left insertion holes 424 are circular holes vertically penetrating the second plate-like portion 425. The two right insertion holes 423 are provided in the front-rear direction at the front end of the second plate 425, and the two left insertion holes 424 are arranged in the front-rear direction at the front end of the second plate 425 Set up. The two right insertion holes 423 respectively face the front two right round holes 365 (see FIG. 4) of the right connection cover 340 from above, and the two left insertion holes 424 respectively correspond to the front two sides of the left connection cover 310. The two left round holes 325 (see FIG. 5) face from above. Screws 913 (see FIG. 2) inserted into the right insertion hole 423 and the right round hole 365 are fastened to the two front right screw holes of the right support 22 and inserted into the left insertion hole 424 and the left round hole 325 Screws 914 (see FIG. 2) are fastened to the two front left screw holes of the left support 23. Therefore, the second cover 420 can be fixed to the support 20 via the right connection cover 340 and the left connection cover 310.

  The rear end of the second cover 420 is formed by a left rear end 458, a right rear end 459, and a second table insertion hole 442. The left rear end 458 and the right rear end 459 linearly extend in the left-right direction. The left rear end 458 contacts the left front end 448 of the first cover 410 from the front, and the right rear end 459 contacts the right front end 443 of the first cover 410 from the front. The left rear end 458 and the right rear end 459 both contact the covering portion 417 from below. In other words, the covering portion 417 overlaps the second cover 420 in the top-bottom direction. The second table insertion hole 442 is formed in a semicircular arc shape which forms a front portion of the table insertion hole 440. In other words, the second table insertion hole 442 forms another portion in the front-rear direction of the table insertion hole 440.

  The cleaning operation of the workpiece support device 8 will be described with reference to FIG. With the processing operation of the machine tool 1, there are times when chips of the workpiece W enter between the table insertion hole 440 and the rotary table 40. At this time, the worker performs a cleaning operation to remove chips. The workpiece support device 8 holds the workpiece W in a posture in which the first shaft 111 extends in the vertical direction.

  The operator removes all the screws 913, 914. The operator can remove the first cover 410 and the second cover 420 in the direction (arrow S in FIG. 2) separated from each other along the front-rear direction. After removing the first cover 410 and the second cover 420, the worker removes, for example, a chip attached to the outer peripheral surface of the rotary table 40 with a brush.

  As described above, at the time of cleaning of the work support device 8 by the operator, the first cover 410 and the second cover 420 can be separated from the support 20 along the front-rear direction orthogonal to the first axis 111. The first shaft 111 is the center of rotation of the rotary table 40 when it is rotated with the drive of the C-axis motor 60 of the C-axis drive unit 50. Since the first cover 410 and the second cover 420 can be separated along the front-rear direction, the cover 400 does not have to be separated from the support 20 in the vertical direction along the first axis 111. That is, the operator does not have to move the cover 400 so that the table insertion hole 440 is pulled upward from the rotary table 40. Therefore, even when the jig 200 is larger than the table insertion hole 440 in plan view, the operator can detach the cover 400 from the support 20 without removing the jig 200 from the rotary table 40. The cover 400 can be easily removed from the support 20. Therefore, the work support device 8 can improve the cleaning work efficiency.

  The first cover 410 and the second cover 420 can be separated from the support 20 along the front-rear direction orthogonal to the first axis 111 and the second axis 112, respectively. Therefore, since the first cover 410 and the second cover 420 do not easily contact the left support mechanism 27 and the right drive mechanism 28 when detached from the support 20, the cover 400 is further removed from the support 20. It will be easier.

  The first cover 410 includes a covering portion 417. Since the covering portion 417 overlaps the second cover 420 in the vertical direction, chips are cut between the first cover 410 and the second cover 420 (that is, the left front end 448 and the left rear end) when the workpiece W is machined by the machine tool 1 Between the front end 443 and the right rear end 459). Therefore, the workpiece support device 8 can suppress the accumulation of chips on the support 20. Further, the covering portion 417 contacts the left rear end 458 and the right rear end 459 from above. Therefore, the covering portion 417 suppresses the displacement of the second plate-like portion 425 along the axial direction of the first axis 111 with the rotational driving of the C-axis motor 60. Therefore, the workpiece support device 8 can further suppress the chips from entering between the first cover 410 and the second cover 420.

  Since the covering portion 417 covers the space between the first plate-like portion 415 and the second plate-like portion 425, the chips are more difficult to enter between the first plate-like portion 415 and the second plate-like portion 425. Therefore, the workpiece support device 8 can further suppress the accumulation of chips on the support 20.

  At a position shifted from the table insertion hole 440 in the left-right direction, the covering portion 417 protrudes from the end surface 415A of the first plate-like portion 415 to the front side in the left-right direction. Therefore, the covering portion 417 covers between the first plate-like portion 415 and the second plate-like portion 425 in the left-right direction at a position shifted from the table insertion hole 440 in the left-right direction. Therefore, the chips become more difficult to enter between the first plate-like portion 415 and the second plate-like portion 425.

  In the above embodiment, the C-axis drive unit 50 is an example of the drive unit of the present invention. The work supporting device 8 is an example of the rotary table device of the present invention. The longitudinal direction is an example of the orthogonal direction of the present invention. The back side is an example of one side of the present invention. The front side is an example of the other side of the present invention.

  The present invention is not limited to the above embodiment. The covering portion 417 may be integrally formed with the first plate-like portion 415 instead of being separate from the first plate-like portion 415. The covering portion 417 may be fixed to the lower end surface of the first plate-like portion 415. At this time, the covering portion 417 is located below the second plate portion 425. That is, the covering portion 417 overlaps the second plate portion 425 in the vertical direction.

  A first cover 610, which is a variation of the first cover 410, and a second cover 620, which is a variation of the second cover 420, will be described with reference to FIG. The first cover 610 is provided with a first base 615 instead of the first plate-like portion 415, and the second cover 620 is provided with a second base 625 instead of the second plate-like portion 425. Each of the first base 615 and the second base 625 has a rectangular parallelepiped shape extending in the left-right direction and the front-rear direction. The covering portion 617 included in the first cover 610 protrudes forward from the upper end of the front end of the first base 615. The covering portion 617 is integrally formed with the first base 615. The upper end of the covering portion 617 is at the same upper and lower position as the upper end of the first base 615, and the lower end of the covering portion 617 is at the upper and lower position higher than the lower end of the first base 615. The covering portion 617 is placed on the step portion 625A formed at the rear end of the second base 625. Even in this case, the covering portion 617 overlaps the second cover 620 in the vertical direction, and covers the space between the first cover 610 and the second cover 620.

  The cover 400 can separate the first cover 410 and the second cover 420 in the front-rear direction, but may be configured to be separated in the left-right direction. Also, in the horizontal plane, it may be possible to separate in directions other than the front and rear direction and the left and right direction.

DESCRIPTION OF SYMBOLS 1 machine tool 8 work support apparatus 20 support stand 40 rotation table 50 C axis drive part 111 1st axis 112 2nd axis 200 jig 400 cover 410 1st cover 415 1st plate-like part 415A end surface 417 coating part 420 2nd cover 425 second plate-like portion 440 table insertion hole

Claims (5)

A rotary table on which a jig for holding a work can be attached
A drive unit that rotationally drives the rotary table;
A support for supporting the drive unit;
A table insertion hole through which the rotary table is inserted, and a cover removably fixed to the support at a position covering the support;
In the rotary table device installed in the machine tool,
The cover is
A first cover having a first table insertion hole forming a part of the table insertion hole;
A rotary table apparatus comprising: a second table insertion hole forming the other part of the table insertion hole; and a second cover formed separately from the first cover. The rotary table, the drive unit, and the support are integrally rotatable around a second axis orthogonal to a first axis which is a rotation center of the rotary table when rotated by the drive unit. ,
The first table insertion hole forms a portion on one side of the table insertion hole in an orthogonal direction orthogonal to each of the first axis and the second axis,
The rotary table device according to claim 1, wherein the second table insertion hole forms a portion on the other side of the table insertion hole in the orthogonal direction.   The first cover is provided with a covering portion which is located at a position shifted from the table insertion hole in the direction in which the second axis extends, and overlaps the direction in which the first axis extends with respect to the second cover. The rotary table device according to claim 2. The first cover includes a first plate-like portion extending orthogonal to a direction in which the first axis extends.
The second cover includes a second plate-like portion that is at the same position as the first plate-like portion in a direction in which the first axis extends, and extends in parallel with the first plate-like portion.
The rotary table apparatus according to claim 3, wherein the covering portion protrudes from the end face of the first plate-like portion in the direction from the support base toward the rotary table to the other side in the orthogonal direction. .   5. The rotary table apparatus according to claim 4, wherein the covering portion protrudes from the end face of the first plate-like portion to the other side in a direction in which the second axis extends.

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