JP2013226583A - Tip dresser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip dresser that can be compactly composed to reduce a cutting work space and an installation space.SOLUTION: A tip dresser 5 includes a driving motor and a gear 16 that rotationally drive a holder 9 holding a cutter 7; a housing 21; and a rolling bearing 32. The gear 16 comprises a hypoid gear 17, and a hypoid pinion 18 extending from a driving shaft of the driving motor. The holder 9 is mounted to a holding frame 28 in a state of the outer peripheral side being covered with the hypoid gear 17 and the holding frame 28. The rolling bearing 32 is enclosed in such a manner that an outer race 33 is held in a storage recess 24a of the housing 21, and the rolling bearing 32 is arranged at the rear face side part of a tooth space 17c of the hypoid gear 17. In this state, the holding frame 28 and the hypoid gear 17 are connected to an inner race 34 and mounted to the housing 21.

Description

  The present invention relates to a tip dresser that cuts and polishes the tips of a pair of electrode tips held by a welding gun.

  Conventionally, there has been a chip dresser having a cutter that is held by a holder having a rotation center axis that coincides with the axial center of electrode chips, and the holder is rotated by a drive motor. In this conventional chip dresser, the drive shaft of the drive motor is configured to be substantially parallel to the rotation center axis of the holder (see, for example, Patent Document 1).

  There has also been an electrode chip reproducing device in which the drive shaft of the drive motor is configured to be orthogonal to the axis of the electrode chip (see, for example, Patent Document 2).

JP 2008-73716 A JP 2010-188366 A

  However, in the chip dresser described in Patent Document 1, since the drive shaft of the drive motor is substantially parallel to the rotation center axis of the holder, the drive motor greatly protrudes from the holder along the rotation center axis. It was to be done and was bulky. For this reason, a relatively large space is required at the installation location, and a relatively large cutting work space is required even when the robot arm is attached to the tip of the robot arm. However, there was a problem.

  Further, the electrode chip reproducing device described in Patent Document 2 is configured so that the drive shaft of the drive motor is orthogonal to the axis of the electrode chip so that the drive motor is not bulky in the direction along the rotation center axis of the holder. Although it is configured using a hypoid gear and a hypoid pinion, there is a problem in that the periphery of the holder is made more compact.

  The present invention solves the above-described problems, and an object thereof is to provide a chip dresser that can be compactly configured and can reduce a cutting work space and an installation space.

<Explanation of Claim 1>
The tip dresser according to the present invention is configured to polish against a rotating cutter while bringing the tips of a pair of opposing electrode tips close to each other,
A cutter that can cut the vicinity of the tip of each electrode tip, a holder that holds the cutter and has a rotation center axis that coincides with the axis of each other, and a drive source that drives the holder to rotate A chip dresser comprising: a drive motor as a motor; a gear for transmitting the drive of the drive motor to the holder; a housing for housing the gear; and a rolling bearing interposed between the gear and the holder and the housing. ,
The drive motor is configured to make the drive shaft substantially orthogonal to the rotation center axis of the holder,
The gear
An annular hypoid gear disposed on the outer peripheral side of the holder and having a rotation center axis coinciding with the rotation center axis of the holder;
A hypoid pinion that extends from the drive shaft of the drive motor and is arranged so as to deviate from the rotation center axis of the hypoid gear;
Composed of
The holder is attached to the holding frame in a state where the outer peripheral side is covered by the hypoid gear and an annular holding frame adjacent to the hypoid gear on the direction side along the rotation center axis of the holder,
The housing is divided into two on the direction side along the rotation center axis of the holder, and includes a gear side portion that becomes the hypoid gear side and a frame side portion that becomes the holding frame side,
The rolling bearing has a structure including an outer race disposed on the outer peripheral side, an inner race disposed on the inner peripheral side, and a rolling element interposed between the outer race and the inner race, and a gear side portion or a frame side In the storage recess formed in at least one of the parts, the outer race is held and stored,
As a state in which the rolling bearing is arranged on the back side of the hypoid gear tooth gap, the holding frame and the hypoid gear are connected to the inner race,
It is attached to the housing.

  In the chip dresser according to the present invention, as a gear for transmitting the drive of the drive motor to the holder, a hypoid gear disposed on the outer peripheral side of the holder and a hypoid extending from the drive shaft of the drive motor so as to be shifted from the rotation center axis of the hypoid gear. Since the drive motor is configured to make the drive shaft substantially orthogonal to the rotation center axis of the holder, the drive motor is moved from the holder to the rotation center axis. Can be suppressed from projecting along the center of the drive motor, and the width dimension on the direction side along the rotation center axis of the holder of the drive motor can be reduced, thereby suppressing the bulkiness.

  Further, in the chip dresser according to the present invention, the rolling bearing is arranged at only one place on the back surface side of the tooth groove of the hypoid gear, and the rolling bearing is arranged on the gear side portion in the housing for housing the gear or In this configuration, the outer race is held in the storage recess formed in one of the holding frame side portions, and the holding frame and the hypoid gear are connected to the inner race in a state where the outer race is stored. For this reason, in the chip dresser according to the present invention, even when the rolling bearing is arranged at only one place, the holding frame holding the holder is smoothly rotated with respect to the housing together with the hypoid gear when the drive motor is driven. Compared with the case where rolling bearings are arranged at two locations so as to sandwich the front and back of the hypoid gear, the width dimension of the housing for housing the gear along the central axis of rotation of the holder is also compared. Since this rolling bearing is arranged on the back surface side of the tooth groove of the hypoid gear, the rolling bearing and the tooth groove of the hypoid gear are made closer to the rotation center axis of the holder. The outer diameter of the members around the holder can be made compact, and the chip dresser can be made as small as possible. . Therefore, the chip dresser according to the present invention can be compact as much as possible, and can be easily installed in a place where only a narrow cutting work space can be obtained.

  Therefore, the chip dresser according to the present invention can be configured compactly, and the cutting work space and the installation space can be reduced.

<Explanation of Claim 2>
Further, in the chip dresser according to the present invention, if the mounting seat attached to the support member for holding the chip dresser is configured by the region shifted from the drive motor on the surface on the drive motor side in the housing, the hypoid pinion The region formed by shifting the hypoid gear relative to the rotation center axis can be used effectively, and the mounting seat is in the direction side along the rotation center axis of the holder or in the direction side orthogonal to the rotation center axis. In addition, since the protrusion can be suppressed, the bulkiness can be further suppressed. For example, the tip dresser is more suitable when attached to the tip of a robot arm or a support base.

It is a top view of the chip dresser which is one embodiment of the present invention. It is a bottom view of the chip dresser of an embodiment. It is a front view of the chip dresser of an embodiment. It is a right view of the chip dresser of an embodiment. In the chip dresser of an embodiment, it is a schematic partial expanded sectional view showing the part of a cutter. In the chip dresser of an embodiment, it is a partial enlarged plan view in the state where a holder was removed. It is a general | schematic fragmentary expanded sectional view which shows the attachment state of a hypoid gear and a holding frame in the chip dresser of embodiment. It is a use mode figure of the tip dresser of an embodiment, and is a schematic perspective view showing the state installed in the foot of a welding robot.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A tip dresser 5 according to the embodiment cuts the distal end portions 2 of a pair of electrode tips 1 (1A, 1B) deformed by a plurality of welding operations. The electrode tips 1A and 1B are formed so as to be reusable for spot welding. In the embodiment, unless otherwise specified, the direction along the axis C0 of the electrode chip 1 is the vertical direction, and the direction along the drive shaft 13b of the drive motor 13 is the front-back direction unless otherwise specified. The description will be made with the gear 16 side as the front side and the drive motor 13 side as the rear side.

  As shown in FIGS. 1 to 5, the tip dresser 5 includes a cutter 7 that cuts the electrode tips 1 </ b> A and 1 </ b> B, a holder 9 that holds the cutter 7, a drive motor 13 that serves as a drive source that rotationally drives the holder 9, and A gear 16 that transmits the drive of the drive motor 13 to the holder 9, a housing 21 that houses the gear 16, a holding frame 28 that holds the holder 9, and the gear 16, the holding frame 28, and the housing 21 are interposed. And a bearing 32 as a rolling bearing.

  The cutter 7 is a cutting blade having a shape corresponding to the outer shape of substantially half of the tip portion 2 on one side centered on the axis C0 of the electrode tip 1 so that the tip portions 2 of the opposing electrode tips 1A and 1B can be cut simultaneously. (Refer to FIG. 5). The cutter 7 is formed by cutting a flat metal material such as high-speed tool steel with a wire cutter. The cutter 7 is held at a holder 9 with a screw 8 fixed at a substantially central position.

  The holder 9 is formed from a metal material such as carbon tool steel, and in the case of the embodiment, as shown in FIG. A discharge recess 9a for discharging chips at the time of cutting is disposed so as to penetrate along the rotation center axis C1 at the time of cutting that coincides with the axis C0 of the chip 1. The holder 9 has receiving surfaces 9b and 9b that are recessed so as to receive the tip portions 2 of the pair of electrode chips 1A and 1B on both end sides (see FIG. 7), and a part of the discharging recess 9a. This surface is an attachment surface 9c to which the cutter 7 is attached. In the case of the embodiment, the holder 9 has a flange portion 10 that protrudes outward on the upper end side. The flange portion 10 is formed with through holes 10a penetrating up and down for insertion of the screws 11 at three substantially radial locations (see FIG. 5), and the holder 9 is shown in FIG. Screws 11 are fixed to the holding frame 28 and attached to the holding frame 28 at three locations that are substantially radial in the portion of the flange portion 10.

  The drive motor 13 as a drive source is disposed so as to protrude rearward from the rear side surface of the housing 21 in a state of being housed in the motor case 13a. The drive shaft 13b is connected to the rotation center axis C1 of the holder 9. A substantially rectangular parallelepiped shape that is wide in the front-rear direction along the front-rear direction so as to be substantially orthogonal. In the case of the embodiment, the drive motor 13 is a small one (AC servo motor) whose output is set to 400 W. And the drive motor 13 makes the up-and-down width dimension in the state accommodated in the motor case 13a substantially correspond to the up-and-down width dimension of the base part side part 25 in the housing 21, as shown in FIG. 1-3, the width dimension is set slightly smaller than the front and rear width dimensions of the housing 21, and the left and right width dimensions are set to the left and right width dimensions of the housing 21, as shown in FIGS. It is set to about 2/3. The drive motor 13 (motor case 13a) has a drive shaft 13b positioned at the center to the right with respect to the rotation center axis C1 of the holder 9 so that the right end surface thereof is substantially coincident with the right end surface of the housing 21. It is arranged by shifting (offset).

  As shown in FIG. 5, the gear 16 includes a hypoid gear 17 disposed on the outer peripheral side of the lower end side of the holder 9 and a hypoid pinion 18 disposed so as to extend from the drive shaft 13 b of the drive motor 13. ing. The hypoid gear 17 has a substantially annular shape through which the holder 9 can be inserted, and is arranged so that the tooth groove 17c faces downward and the rotation center axis C2 coincides with the rotation center axis C1 of the holder 9 (FIG. 5). reference). The hypoid pinion 18 is formed on the distal end side of the drive shaft 13b, and is disposed so as to protrude from a base portion side portion 25 described later of the housing 21, and as shown in FIGS. In a state shifted to the right (offset) with respect to the rotation center axis C3, the lower surface side of the hypoid gear 17 is engaged with the tooth groove 17c of the hypoid gear 17 (see FIG. 5). In the case of the embodiment, as the hypoid gear 17 and the hypoid pinion 18, those having a reduction ratio set as high as about 20: 1 are used. Further, the hypoid pinion 18 has a region along the distal end side of the tooth gap 18a (see FIGS. 1 and 2) in the direction along the flange portion 10 of the holder 9 and the rotation center axis C1 of the holder 9, as shown in FIG. It arrange | positions in the position which overlaps on the (up-down direction) side.

  The hypoid gear 17 has a tooth groove 17c projecting from the lower surface side of the outer peripheral edge, and a plurality of through holes 17a and 17b are formed substantially radially around the rotation center axis C3 in an annular portion inside the tooth groove 17c. A portion is formed so as to penetrate vertically. In the embodiment, though not shown, the through holes 17a and 17b are formed in a total of six, two each at three substantially radial locations, like through holes 29a and 29b of the holding frame 28 described later. Has been. These through-holes 17a and 17b are formed at positions corresponding to the through-holes 29a and 29b formed in the main body 29 of the holding frame 28, and among these, three through-holes scattered in a substantially radial manner. The hypoid gear 17 is attached to the main body 29 of the holding frame 28 by inserting and fastening the screw 19 set to a length capable of entering the through hole 29b into the hole 17b (see FIG. 7). . The remaining three through holes 17a are formed to attach the holder 9 to the holding frame 28, and are not actually used for screwing at the hypoid gear 17 portion. Further, in the case of the embodiment, the hypoid gear 17 is in a state in which the lower surface side (tooth groove 17c side) is covered with a lower case 23 described later and the vicinity of the outer peripheral edge on the upper surface (back surface) side is covered with an upper case 24 described later. Thus, it is housed in the housing 21.

  In the case of the embodiment, the housing 21 is configured to include a base portion side portion 25 that houses the drive shaft 13b formed so as to protrude from the drive motor 13, and a tip end portion portion 22 that houses the gear 16. As shown in FIGS. 3, 5, and 7, the tip side portion 22 is divided into two on the direction side (vertical direction side) along the rotation center axis C <b> 1 of the holder 9, and serves as a gear side portion that becomes the hypoid gear 17 side. The lower case 23 and an upper case 24 as a frame-side portion on the holding frame 28 side are provided.

  The front end side portion 22 is configured by curving the front end side in a substantially arc shape, and is formed by gradually decreasing the thickness toward the front end side, and is substantially circular in which the holding frame 28 and the holder 9 can be inserted in the approximate center. The insertion opening 22a is provided (see FIGS. 2 and 5). In the distal end portion 22, the lower case 23 is configured to cover the outer peripheral side of the hypoid gear 17 and the hypoid pinion 18 over substantially the entire area except for the inner peripheral surface of the hypoid gear 17. The upper case 24 is configured to cover the outer peripheral surface side of the holding frame 28 so that the upper surface side is exposed, and as shown in FIG. 5, the upper case 24 is recessed so as to be continuous from the insertion opening 22a. A storage recess 24a for storing the bearing 32 is provided. The inner diameter dimension of the storage recess 24 a is set slightly smaller than the outer diameter dimension of the outer race 33 in the bearing 32. Specifically, the inner diameter dimension of the storage recess 24 a is set to a dimension capable of holding the outer race 33 by press-fitting the outer race 33 of the bearing 32. The upper case 24 and the lower case 23 are screwed (not shown) and are connected to each other in the vicinity of the left and right edges on the rear end side.

  As shown in FIGS. 1 and 2, the base portion side portion 25 is formed so as to extend rearward from the distal end side portion 22 so that the width dimension in the left-right direction is matched with the distal end side portion 22. The drive shaft 13b is formed in a substantially rectangular parallelepiped shape that covers the entire outer periphery of the drive shaft 13b and is positioned upward stepwise with the lower surface side forward. In the case of the embodiment, as shown in FIG. 3, the base portion side portion 25 is configured integrally with the upper case 24. That is, the base portion side portion 25 is formed so as to protrude largely leftward from the drive motor 13. In the housing 21 of the embodiment, the left region offset from the drive motor 13 on the surface (rear surface) of the base portion side portion 25 on the drive motor 13 side has a plurality of mounting holes 26a, and the robot arm The mounting seat 26 attached to a support member such as a front end of the bracket or a mounting bracket is configured (see FIG. 4).

  As shown in FIGS. 5 to 7, the holding frame 28 is formed in a substantially annular shape adjacent to the upper side of the hypoid gear 17, and a substantially cylindrical main body 29 that covers the outer peripheral side of the holder 9 on the axis orthogonal direction side, and a main body 29, and a flange portion 30 formed so as to protrude outward from the upper end of 29. Further, the vicinity of the upper end of the main body 29 is formed in a stepped shape with a larger opening diameter so that the flange 10 of the holder 9 can be accommodated. Further, the lower end side of the main body 29 is in contact with the hypoid gear 17 (see FIGS. 5 and 7). In the main body 29 of the holding frame 28, through holes 29a and 29b are formed so as to penetrate vertically. The through holes 29a and 29b are formed at positions corresponding to the through holes 17a and 17b formed in the hypoid gear 17, and, similar to the through holes 17a and 17b, two holes are provided at three points that are substantially radial. 6 (see FIG. 6), a total of six are formed, but among these, three through holes 29 a that are scattered in a substantially radial manner that are not used for fixing the screw 19 of the hypoid gear 17 are formed in the holder 9. The holder 9 is held by the holding frame 28 by being inserted into the through-hole 10a of the holder 9 and the through-hole 29a and being fastened to the through-hole 10a. . In the case of the embodiment, the holding frame 28 is configured such that the flange portion 10 is accommodated in the stepped region, the holder 9 is inserted therein, and the upper surface is substantially flush with the upper surface of the holder 9. The holder 9 is held.

  In the embodiment, the bearing 32 as a rolling bearing is housed in a housing recess 24a formed in the upper case 24, and is interposed between the holding frame 28, the hypoid gear 17, and the upper case 24 (see FIG. 5, 7), an outer race 33 disposed on the outer peripheral side, an inner race 34 disposed on the inner peripheral side, and a large number of balls 35 as rolling elements interposed between the outer race 33 and the inner race 34, , And so on. As described above, the outer diameter of the outer race 33 is set to be slightly larger than the inner diameter of the storage recess 24a of the upper case 24 so that the outer race 33 is press-fitted in the bearing 32. It is the structure accommodated in the accommodation recessed part 24a, hold | maintaining at 24a. At this time, the bearing 32 overlaps the tooth groove 17c of the hypoid gear 17 on the direction (vertical direction) side along the rotation center axis C1 of the holder 9 on the upper surface 17d side portion (rear surface) of the hypoid gear 17 Side part). In the chip dresser 5 of the embodiment, the bearing 32 is disposed on the upper surface 17d side portion (rear surface side portion) of the tooth groove 17c of the hypoid gear 17 by screwing the hypoid gear 17 to the holding frame 28. Thus, the main body 29 of the holding frame 28 and the hypoid gear 17 are connected to the inner race 34 and attached to the housing 21. In the chip dresser 5 of the embodiment, since the hypoid gear 17 is partially covered by the lower case 23 and the upper case 24 on both upper and lower sides, the holding frame 28 and the hypoid gear 17 are temporarily connected. Even if the inner race 34 moves up and down, the lower case 23 and the upper case 24 serve as a stopper, and the inner race 34 can be prevented from moving greatly in the vertical direction.

  In the chip dresser 5 of the embodiment, when the drive motor 13 is driven, the holder 9 is rotationally driven with the rotation of the hypoid gear 17 and rotates in the vicinity of the front end portion 2 of the opposing electrode chips 1A and 1B. It can be cut against the cutter 7.

  In the chip dresser 5 according to the embodiment, the hypoid gear 17 disposed on the outer peripheral side of the holder 9 and the rotation center of the hypoid gear 17 are used as the gear 16 for transmitting the drive of the drive motor 13 to the holder 9 holding the cutter 7. A hypoid pinion 18 extending from the drive shaft 13b of the drive motor 13 so as to be shifted (offset) with respect to the axis C2 is used. The drive motor 13 connects the drive shaft 13b to the holder 9 Since the drive motor 13 is configured so as to be substantially orthogonal to the rotation center axis C1, the drive motor 13 can be prevented from greatly projecting up and down along the rotation center axis C1 from the holder 9, and the holder 9 of the drive motor 13 The width dimension on the direction side (vertical direction side) along the rotation center axis C1 can be reduced, and bulkiness can be suppressed.

  Moreover, in the chip dresser 5 of the embodiment, the bearing 32 is housed in the configuration in which the bearing 32 as a rolling bearing is disposed only at one place on the rear surface side (upper surface side) of the hypoid gear 17. The outer race 33 is held in the storage recess 24a formed in the upper case 24 of the housing 21 to be stored, and the holding frame 28 and the hypoid gear 17 are connected to the inner race 34 in a state of being stored. . Therefore, even if the bearing 32 is arranged at only one place, the holding frame 28 holding the holder 9 can be smoothly rotated with respect to the housing 21 together with the hypoid gear 17 when the drive motor 13 is driven. Therefore, as compared with the case where bearings are arranged at two locations so as to sandwich the front and back of the hypoid gear, the direction of the housing 21 that houses the gear 16 itself along the rotation center axis C1 of the holder 9 (the vertical direction side) ) Can also be reduced, and since this bearing 32 is disposed at a portion of the upper surface 17d of the tooth groove 17c of the hypoid gear 17, the bearing is located with respect to the rotation center axis C1 of the holder 9. 32 and the tooth groove 17c of the hypoid gear 17 can be approached, and the outer diameter dimensions of the members around the holder 9 are compact. And it can be, the tip dresser 5, can be minimized. This means that the region on the tip end side of the tooth groove 18a of the hypoid pinion 18 overlaps the flange portion 10 of the holder 9 on the direction (vertical direction) side along the rotation center axis C1 of the holder 9. It can be said that the outer diameter of the members around the holder 9 can be made compact by arranging the hypoid pinion 18 and the hypoid gear 17 close to the flange portion 10 of the holder 9. In particular, in the chip dresser 5 of the embodiment, since the gear 16 is composed of the hypoid gear 17 and the hypoid pinion 18 having a high reduction ratio as a single stage, the drive motor 13 with low energy loss and small output is used. However, the electrode tip 1 can be cut smoothly, and the drive motor 13 itself can be made as compact as possible. Therefore, the chip dresser 5 of the embodiment can be made as compact as possible in its outer shape. For example, as shown in FIG. 8, the tip dresser 5 can also be used in a place where only a narrow cutting work space at the foot of the welding robot R can be obtained. It can be easily installed in a state attached to 38. In addition, the chip dresser 5 of the embodiment is not bulky and can be easily used even in a place where the operation space is small, even when attached to the tip of a robot arm (not shown).

  Therefore, the chip dresser 5 of the embodiment can be configured compactly, and the cutting work space and the installation space can be reduced.

  Further, in the chip dresser 5 of the embodiment, a region shifted (offset) from the drive motor 13 on the surface on the drive motor 13 side in the base portion side portion 25 of the housing 21 is used as a support member that holds the chip dresser 5. Since the mounting seat 26 is mounted, the region formed by shifting (offset) the hypoid pinion 18 with respect to the rotation center axis C2 of the hypoid gear 17 can be used effectively. Since it is possible to prevent the holder 9 from protruding greatly in the direction side (vertical direction side) along the rotation center axis C1 and the left and right direction side orthogonal to the rotation center axis C1, it is possible to further suppress bulkiness, for example, It is even more suitable when it is used by being attached to the tip of an arm or a support base. Of course, if such a point is not taken into consideration, the mounting seat may not be configured from this region, and the chip dresser may be separately mounted on the support member using a mounting bracket or the like.

  In the chip dresser 5 of the embodiment, the storage recess 24a for storing the bearing 32 as the rolling bearing is formed in the upper case 24 that is the holding frame side portion, but the storage recess for holding the bearing is the gear. You may form in the lower case which is a side part, Furthermore, you may form so that an upper case and a lower case may be straddled. Further, in the embodiment, the bearing 32 is slightly rotated around the rotation center axis C1 with respect to the back surface side of the tooth groove 17c of the hypoid gear 17, in other words, the region overlapping the rotation center axis C1 of the holder 9 in the tooth groove 17c. However, the entire bearing 32 may be disposed so as to overlap the back surface side of the tooth gap 17c within a range that does not increase the outer diameter of the holder 9.

  DESCRIPTION OF SYMBOLS 1 (1A, 1B) ... Electrode tip, 2 ... Tip part (tip), 5 ... Tip dresser, 7 ... Cutter, 9 ... Holder, 13 ... Drive motor (drive source), 13b ... Drive shaft, 16 ... Gear, 17 ... Hypoid gear, 18 ... Hypoid pinion, 21 ... Housing, 22 ... Front end side part, 23 ... Lower case (gear side part), 24 ... Upper case (frame side part), 24a ... Storage recess, 25 ... Base part side part, 26 ... mounting seat, 28 ... holding frame, 32 ... bearing (rolling bearing), 33 ... outer race, 34 ... inner race, 35 ... ball (rolling element).

Claims (2)

It is configured to polish against the rotating cutter while approaching the mutual tips of a pair of opposing electrode tips,
A cutter capable of cutting the vicinity of the tip of each electrode tip; a holder that holds the cutter and has a rotation center axis that coincides with the axial center of the electrode tips; and the holder A drive motor as a drive source for rotational drive, a gear for transmitting the drive of the drive motor to the holder, a housing for housing the gear, and a rolling bearing interposed between the gear, the holder and the housing A chip dresser having a configuration comprising:
The drive motor is configured so that the drive shaft is substantially orthogonal to the rotation center axis of the holder;
The gear is
An annular hypoid gear disposed on the outer peripheral side of the holder and having a rotation center axis coinciding with the rotation center axis of the holder;
A hypoid pinion that extends from the drive shaft of the drive motor and is arranged so as to deviate from the rotation center axis of the hypoid gear;
Composed of
The holder is attached to the holding frame in a state where the outer peripheral side is covered by the hypoid gear and an annular holding frame adjacent to the hypoid gear on the direction side along the rotation center axis of the holder,
The housing is divided into two on the direction side along the rotation center axis of the holder, and includes a gear side portion that becomes the hypoid gear side, and a frame side portion that becomes the holding frame side,
The rolling bearing is configured to include an outer race disposed on the outer peripheral side, an inner race disposed on the inner peripheral side, and a rolling element interposed between the outer race and the inner race. The outer recess is stored in a storage recess formed in at least one of the part or the frame side part, and is stored,
As a state in which the rolling bearing is disposed on the back surface side portion of the tooth space of the hypoid gear, the holding frame and the hypoid gear are connected to the inner race,
A chip dresser attached to the housing.   2. The mounting seat attached to a support member for holding a chip dresser is configured in a region shifted from the drive motor on a surface of the housing on the drive motor side. Chip dresser.

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