JP2000071132A - Work holding device and bolt press-fitting equipment using work holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt press-fitting equipment equipped with a work holding device, capable of easily positioning various types of housings in relation to a bolt press-fitting machine. SOLUTION: In a bolt press-fitting equipment 10 having a work holding device 11 for holding a housing 1 having a bolt insertion hole 6 and a bolt press-fitting machine 12 for forcing a bolt 5 into the bolt insertion hole 6 of the housing 1 held in the work holding device 11, the work holding device 11 is provided with a pallet 13 which is conveyable by a conveyor, and a sub- ring 14 which is to be mounted to the pallet 13. The sub-ring 14 is structured to be easily mounted to and demounted from the pallet 13, and has a positioning part for regulating its relative position to the pallet 13, a work supporting part 35 for putting the housing 1 on it, and a bolt receiving hole 31 at a position through which the bolt 5 temporarily put in the bolt insertion hole 6 of the housing 1 can be inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work holding device suitable for holding, for example, a housing constituting a differential of a vehicle and the like, and a method for press-fitting a bolt into the housing held by the work holding device. Related to bolt press-fitting equipment.

[0002]

2. Description of the Related Art A differential mounted on a drive shaft of an automobile includes a housing 1 and a differential carrier 2 as shown in FIG. Axle tubes 3 are provided on both sides of the housing 1. A circular opening 4 is formed in an end surface of the housing 1, and an edge 4 a of the opening 4 is formed.
Are provided with a plurality of bolts 5 at a predetermined pitch in the circumferential direction. These bolts 5 project from the end face of the housing 1.

The bolt 5 is used to fasten the differential carrier 2 to the housing 1. Each bolt 5 is temporarily placed in advance in a bolt insertion hole 6 formed in an opening edge 4 a of the housing 1, and is press-fitted from the inside of the housing 1 by a bolt press-in machine, and the outer peripheral surface of the bolt 5 and the bolt insertion hole 6 are formed. The close contact with the inner peripheral surface prevents oil in the housing 1 from leaking to the outside.

In order to press the bolt 5 into the bolt insertion hole 6, for example, a bolt press machine 7 shown in FIG. 17 has been used. The bolt press-fitting machine 7 was provided with a clamp mechanism 8 for holding the housing 1 and a number of press-fit units 9 corresponding to the number of bolts 5. The press-fit unit 9 includes the housing 1
Press fitting 9a for pressing the head 5a of the bolt 5 from the inside of the work piece, and a work receiving metal 9 facing the press fitting 9a.
b, and a hydraulic cylinder 9c for driving the press fitting 9a toward the work receiver 9b.

In order to press-fit the bolt 5 into the bolt insertion hole 6 using the press-fitting machine 7, the bolt 5 is manually inserted into the bolt insertion hole 6 to some extent in advance. Then, the press fitting 9a is inserted into the inside of the housing 1, and the press fitting 9a is inserted.
With the work head 9b
To the lower surface of the opening edge 4a. Then, the bolt 5 is press-fitted into the bolt insertion hole 6 by pressing the press fitting 9a toward the work receiving 9b by the hydraulic cylinder 9c.

The above-described conventional bolt press machine 7 requires the press-fit units 9 for the number of bolts 5, and therefore, a hydraulic cylinder 9c having a small ram diameter is employed due to restrictions on the installation space and the like. For this reason, in order to obtain a predetermined press-fitting load, the hydraulic pressure must be set to a considerably high value. Moreover, since it is a dedicated machine corresponding to the type of the housing 1, the number of bolt press-in machines 7 corresponding to the type of the housing 1 is increased.
Needed. Then, in order to solve such a problem, while moving the pair of press-fitting units in accordance with the type of the housing 1 (the position of the bolt 5), the bolt 5 is moved by two.
A device for press-fitting one by one was also considered.

[0007]

However, since the types of the housings 1 are different depending on the type of vehicle and are numerous, the number of bolts 5 provided on the housing 1 and the form such as pitch are various. A complicated centering mechanism was required for correctly setting the press-fitting machine at a predetermined position. In addition, in order to set the housing 1 on the bolt press machine, it is necessary for an operator to handle the housings one by one by a hoisting machine or the like by hand, which takes time and labor.

Further, in the conventional bolt press machine, since the lower surface of the housing 1 is directly supported by the work receiving member, the bolt receiving hole of the work receiving member necessary for receiving the bolts 5 of various sizes is provided. The inside diameter had to be set relatively large. Therefore, when press-fitting a small-diameter bolt, the distance between the inner peripheral edge of the bolt receiving hole of the work holder and the opening edge of the bolt insertion hole becomes large. Burrs and deformation are likely to occur at the edges.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a work holding device capable of easily positioning various works having different types of bolts with respect to a bolt press machine or the like, and a quality defect such as a burr at an opening edge of a bolt insertion hole. It is an object of the present invention to provide a bolt press-in facility capable of press-fitting a bolt without occurrence.

[0010]

In order to achieve the above-mentioned object, a work holding apparatus according to the present invention prepares sub-rings on a pallet according to the type of work, and mounts them as necessary. This sub-ring is held at a predetermined position on the pallet by the positioning portion. The position of the work relative to the sub-ring is determined by inserting a bolt temporarily placed in the bolt insertion hole at the periphery of the opening of the work into the bolt receiving hole of the sub-ring, and as a result, the position of the work relative to the pallet is determined. Is also determined.

A bolt press-fitting device according to the present invention is constructed as described in claim 2, wherein a sub-ring according to the type of the housing is mounted at a predetermined position on the pallet, and a bolt of the housing is inserted into a bolt receiving hole of the sub-ring. The housing is held at a predetermined position on the pallet. Then, the press-fit unit is rotated and moved by the pitch feed mechanism of the bolt press-fitting machine according to the pitch circle diameter of the bolt to be inserted, so that the press-fit unit is aligned with the bolt insertion hole. In this state, a hydraulic pressure is applied to the actuator, and the press-fitting member and the support member facing the press-fitting member are moved in a direction approaching each other, thereby holding the bolt together with the sub-ring. That is, with the sub-ring supporting the opening edge of the housing, the head of the bolt is pressed toward the bolt insertion hole by the press-fitting member, so that the bolt is pressed into the bolt insertion hole.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The bolt press-fitting equipment 10 according to one embodiment of the present invention will be described with reference to 5). This bolt press-in equipment 10
It includes a work holding device 11 shown in FIG. 1 and the like, and a bolt press-in machine 12 shown in FIG. 10 and the like. The work holding device 11
It has a function of holding the housing 1 (shown in FIG. 16) at a predetermined position. The bolt press-fitting machine 12 has a function of press-fitting the bolt 5 into the housing 1 as a work as described later. At the opening edge 4a of the housing 1,
Bolt insertion holes 6 as press-fit portions are formed at a predetermined pitch in the circumferential direction.

First, the work holding device 11 will be described. The work holding device 11 is provided with a pallet 13 that can be transported on an assembly line in a factory by a transport means such as a conveyor.
(Shown in FIG. 2) and a sub-ring 14 (shown in FIG. 4) which is detachably mounted on the pallet 13.

The pallet 13 has a circular opening 1 at the center.
5a, a ring-shaped annular wall 16 (shown in FIG. 3) provided on the upper surface of the pallet body 15, and a sub-unit provided along the annular wall 16 at the upper end of the annular wall 16. A ring mounting portion 17 and the like are provided. The annular wall 16 is welded to the pallet body 15. The sub-ring mounting portion 17 is fixed to the annular wall 16 by screws 18 (shown in FIG. 3).

The sub ring mounting portion 17 has the opening 1
5a at a plurality of positions in the circumferential direction at a desired pitch.
Are provided, and bolt receiving holes 21 penetrating vertically through the respective reinforcing members 20 and the sub-ring mounting portions 17 are formed.

A vertical wall 17a is formed along the circumferential direction of the opening 15a at the outer peripheral edge on the upper surface side of the sub ring mounting portion 17. The inner diameter of the vertical wall 17a is set so that the outer diameter of the sub-ring 14 described later can be just fitted. This vertical wall 17a is attached to the sub-ring 14
Functions as a positioning part for regulating the position in the circumferential direction.

As shown in FIG. 1 and the like, brackets 24 are provided on both sides of the sub-ring mounting portion 17 of the pallet body 15 for regulating a rough position of the housing 1. An oil seal holding portion 25 is provided near the sub ring mounting portion 17. The oil seal holding portion 25 holds an oil seal S to be inserted into both end openings of the axle tube 2 of the housing 1.

A pallet positioning hole 27 is formed at a predetermined position of the pallet body 15. The pallet 13 is positioned with respect to the bolt press-in machine 12 by inserting a positioning pin 28 of the bolt press-in machine 12 shown in FIG.

The sub ring 14 has an annular shape having a circular opening 30 at the center. Sub ring 14
The outer diameter of the sub-ring 14 is set so as to just fit on the inner peripheral side of the vertical wall 17 a of the pallet 13.
Is fitted to the vertical wall 17a, so that the pallet 13
The position of the sub-ring 14 with respect to the radial direction (horizontal direction) is regulated. That is, the sub ring 14
Outer peripheral edge 14a functions as a positioning portion.

The inner peripheral side of the sub ring 14, that is, the opening 3
The side close to 0 is a thick portion 14b.
4b, bolt receiving holes 31 are formed at a plurality of locations along the circumferential direction of the opening 30. These bolt receiving holes 31 are formed at a pitch corresponding to the arrangement interval of the bolts 5 of the housing 1 to be held by the sub ring 14. The inner diameter of the bolt receiving hole 31 is slightly larger than the outer diameter of the bolt 5, and all the bolts 5 protruding to the lower surface side of the housing 1 as shown in FIG.
1 can be inserted.

At the position near the outer peripheral edge 14 a of the sub ring 14, holes 33 having a size that allows the reinforcing member 20 of the pallet 13 to be inserted are formed at a plurality of positions at a predetermined pitch in the circumferential direction of the opening 30. Of these holes 33, specific holes 33a
Is a size that fits just on both sides of a specific reinforcing member 20a of the reinforcing members 20 provided on the pallet 13. By fitting a specific hole 33a into the specific reinforcing member 20a, the sub-ring 1
4, so that the position in the rotation direction (circumferential direction) can be accurately regulated. These specific reinforcing members 20a and holes 33a
Is also used as a positioning portion according to the present invention. The upper surface of the sub ring 14 serves as a work supporting portion 35 on which the housing 1 can be placed.

For example, the sub-ring 14 shown in FIG.
By mounting the sub ring 14 on the pallet 13 as shown in FIG. When the sub-rings 14 are set on the pallet 13 in this manner, all the bolts 5 protruding from the lower surface of the housing 1 can be inserted into all the bolt receiving holes 31 of the sub-ring 14 as shown in FIG. Become.

If the type of the housing 1 is different from the above, for example, FIG.
As shown in the figure, by mounting a different type of sub-ring 14 on the same pallet 13 as described above, all the bolts 5 protruding to the lower surface side of the housing 1 can be connected to all the bolt receiving holes 31 of the sub-ring 14. Can be inserted into

Depending on the type of the housing 1, the housing 1 may be directly mounted on the sub-ring mounting portion 17 of the pallet 13 without using the sub-ring 14, and the bolt 5 may be inserted into the bolt receiving hole 21 of the pallet 13. Can also.

Next, the bolt press-fitting machine 12 will be described with reference to FIG.
Will be described with reference to FIG. This bolt press machine 12
Has a press-fitting machine main body 39 assembled by various frame members 38 and the like. As shown in FIG.
A circular hole 40 is formed on the upper surface side of the
An annular bearing portion 41 (shown in FIG. 12) is provided along the inner periphery of. The bearing 41 supports the rotating body 42 so as to be rotatable around the center of the housing 1 in a horizontal plane.

The rotating body 42 has a ring gear 43. The ring gear 43 meshes with the drive gear 45.
The driving gear 45 can be rotated by a predetermined amount by driving means such as a motor 46 with a speed reducer. The motor 46 is rotatable in both forward and reverse directions. The drive gear 45, the motor 46, and the like constitute a rotating body driving mechanism 47 for rotating the rotating body 42 by a predetermined amount.

As shown in FIG. 12, a vertical frame 50 extending vertically is provided on the lower surface side of the rotating body 42.
A lower frame 51 extending in the front-rear direction is provided at a lower end of the vertical frame 50. The lower frame 51 includes a bearing 5
2 and 53, a first gear 54 and a second gear 55 are provided rotatably around shafts 56 and 57 extending vertically, respectively.

A pulley 60 with teeth is provided on a shaft 56 of the first gear 54. A transmission belt 61 such as a toothed belt (timing belt) is wound around the pulley 60. The transmission belt 61 is also wrapped around a driving pulley 63 that is driven to rotate by a motor 62. The rotation of the driving pulley 63 causes the driven pulley 6 to rotate.
As the 0 rotates, the first gear 54 rotates. The motor 62 can also rotate by a predetermined amount in either the forward or reverse direction.

A relay gear 65 such as a bevel gear is provided at the upper end of the shaft 57 of the second gear 55. This relay gear 65
Are engaged with a driven gear 66 such as a bevel gear. The driven gear 66 is fixed to a screw member 70 extending in a direction (horizontal direction) perpendicular to the drive-side shaft 57.

A driven gear 66 is provided on the peripheral surface of the screw member 70.
A first screw portion 71 and a second screw portion 72, each having a reverse screw relationship, are formed on both sides sandwiching. Then, the first nut member 75 is screwed into the first screw portion 71,
A second nut member 76 is screwed into the threaded portion 72 of the second nut member 76.
That is, when the screw member 70 rotates in the first direction, the nut members 75 and 76 move in a direction approaching each other,
When the screw member 70 rotates in the second direction, the nut members 75 and 76 are configured to move in directions away from each other. These gears 54, 55, 65, 66
The pulleys 60 and 63, the belt 61, the motor 62, the screw member 70, and the like constitute a pitch feed mechanism 77 for moving the press-fit units 80 and 81 described below.

The first nut member 75 is provided in a first press-fit unit 80 described below. The second nut member 76 is provided on the second press-fit unit 81. As shown in FIG. 11, each press fitting unit 80, 81
Are mounted on the rotating body 42 in pairs with each other. Since the configuration and operation of these press-fit units 80 and 81 are substantially common to each other, the first press-fit unit 80 will be described as a representative.

The press-fit unit 80 is provided with a gantry 86 which is movable in a horizontal direction along a guide rail 85 extending in a horizontal direction.
It has. The guide rail 85 is provided on the vertical frame 50. The gantry 86 rotates about a vertical axis integrally with the rotating body 42.

The gantry 86 is provided with a guide member 90 (shown in FIG. 13 and the like) extending vertically. A press-in member 91 is provided that can move up and down along the guide member 90. A press-fit head 92 is provided above the press-fit member 91.
Is provided. The press-fit head 92 has a shape capable of contacting the head 5 a of the bolt 5. This press-fit member 91
Is urged downward by a spring 93.

Below the press-fitting member 91, a hydraulic cylinder 100 functioning as an actuator according to the present invention is provided. Inside the hydraulic cylinder 100 is a piston 1
01 separates into a first oil chamber 102 and a second oil chamber 103. A support member 104 is provided above the piston 101. A load cell 100a for detecting a press-fit load is provided between the piston 101 and the support member 104.

The support member 104 extends vertically toward the press-fit head 92, and the upper end 105 of the support member 104 faces the press-fit head 92. Upper end 105 of support member 104
Has a shape capable of supporting around the bolt receiving hole 31 on the lower surface of the sub ring 14. The support member 10
A receiving hole 106 having a size that allows the bolt 5 to enter therethrough is formed at the upper end of 4. A stopper wall 110 is provided below the support member 104.

The stopper wall 110 can be brought into contact with the receiving portion 111 provided on the gantry 86 from above. Therefore, the support member 104 is
With reference to the initial position where 0 and the receiving portion 111 contact,
It is in a floating state in which it can move relatively upwards and move vertically with respect to the press-in member 91. The upper sides of the press-fit member 91 and the support member 104 pass through a hole 112 (shown in FIG. 11) formed in the rotating body 42 and protrude above the rotating body 42.

The first oil chamber 102 and the second oil chamber 103 of the hydraulic cylinder 100 are respectively connected to a hydraulic circuit 115 having a hydraulic pump or the like functioning as a hydraulic pressure source.
The oil pressurized by the hydraulic circuit 115 is supplied to the first oil chamber 102.
Alternatively, the pressure can be selectively fed to the second oil chamber 103.

Next, the bolt press-in equipment 10 of this embodiment will be described.
The bolt press-fitting step using the method will be described. Prior to the press-fitting process, the bolt 5 is inserted into the bolt insertion hole 6 of the housing 1 to a certain depth as shown in FIG. 7 by hand or the like, and the opening 4 is turned downward. deep. These bolts 5 protrude downward from the end surface of the housing 1.

A sub-ring 14 corresponding to the type of the housing 1 is mounted on the pallet 13. The sub-ring 14 is formed such that the outer peripheral edge 14 a is
By fitting a specific hole 33a into a specific reinforcing member 20a, the circumferential and radial positions with respect to the pallet 13 are accurately regulated.

The housing 1 is placed from above the sub-ring 14, and the bolt 5 (shown in FIG. 7) projecting from the lower surface of the housing 1 is inserted into the bolt receiving hole 31. By doing so, the circumferential and radial positions of the housing 1 with respect to the pallet 13 are accurately regulated.

After the work holding device 11 is conveyed together with the housing 1 to the press-fitting stage of the bolt press-fitting machine 12 by a conveyor, as shown in FIG. 27 is fitted. Thus, the pallet 13 is positioned with respect to the press-fitting machine main body 39, and the housing 1 is also positioned with respect to the press-fitting machine main body 39.

After the housing 1 is held at the predetermined position of the press-fitting machine main body 39 as described above, the motor 46 of the rotating body drive mechanism 47 of the bolt press-fitting machine 12 is driven to drive the housing 1
The press-fit units 80 and 81 are set to the predetermined origin positions by adjusting the rotating body 42 to the predetermined origin position. By introducing oil into the first oil chamber 102 of the hydraulic cylinder 100 as shown in FIG.
The distance between the press-fit head 92 and the support member 104 is increased.

Next, the motor 62 of the pitch feed mechanism 77
Is operated to rotate the screw member 70 in the second direction, thereby moving the press-fit units 80 and 81 by a distance corresponding to the distance between the pair of bolts 5 and 5 to be press-fitted (that is, the bolt pitch circle diameter). Let it. By doing this,
The press-fit head 92 faces right above each bolt head 5a between the pair of bolts 5 to be press-fitted, and the support member 1
The upper end 105 of 04 faces the bolt receiving hole 31 in the lower surface of the sub ring 14.

After that, the pressurized oil is supplied to the second oil chamber 103 by the hydraulic circuit 115. At this time, FIG.
As shown in FIG. 7, the stopper wall 110 is supported by the receiving portion 111 and the supporting member 104 is prevented from descending further. Therefore, when oil is supplied to the second oil chamber 103, the press-in member 91 is pressed. And the press-fit head 92 contacts the bolt head 5a from above.

In this state, when the oil is further supplied to the second oil chamber 103, after the press-fit head 92 comes into contact with the bolt head 5a, the support member 104 in the floating state rises, and the support member 104 rises. The upper end 105 of the 104 contacts the lower surface of the sub ring 14. And further, the second oil chamber 103
Is supplied, and the distance between the press-fit head 92 and the support member 104 is reduced, so that the bolt 5 is press-fitted into the bolt insertion hole 6 as shown in FIG.

After the two bolts 5 are press-fitted at the same time, oil is supplied to the first oil chamber 102 and the press-fit head 9
As the distance between the second member 2 and the support member 104 increases, the press-fit head 92 separates from the bolt head 5a, and the support member 104 separates from the housing 1.

After that, the motor 4 of the rotating body driving mechanism 47
6 rotates a predetermined amount, and the rotating body 42
By rotating by the pitch, the press-fit units 80 and 81 move to a new bolt 5 next to the pair of bolts 5 already press-fitted. Then, the aforementioned press-fitting step is repeated.

By repeating the above-described press-fitting process a number of times corresponding to the number of bolts 5, after the press-fitting of all the bolts 5 is completed, the motor 62 of the pitch feed mechanism 77 rotates in the reverse direction, and the press-fitting units 80, The press-fit units 80 and 81 are retracted to positions where they do not interfere with the housing 1. Further, when the motor 46 of the rotator driving mechanism 47 operates, the rotator 42 returns to the original position. Through the above series of steps, the bolt press-in operation for one housing is completed.

[0049]

According to the work holding device of the present invention, the work can be easily positioned at a predetermined position with respect to a bolt press machine or the like, and when the type of work changes, the sub-work corresponding to the work is changed. Since it is only necessary to replace the ring, it is possible to quickly and easily cope with the bolt press-fitting operation for various types of works. Since a large and heavy work such as a housing can be handled together with a pallet by a conveyor, a shuttle, a lifter, or the like, transport and setting to a desired position are easy, and the burden on an operator is reduced.

According to the bolt press-fitting device of the second aspect, the sub-ring having the bolt receiving hole of an appropriate size corresponding to the size of the bolt or the like is used, so that the bolt of the housing is inserted into the bolt receiving hole. However, since the periphery of the bolt insertion hole can be supported by the peripheral edge of the bolt receiving hole, it is possible to avoid burrs and deformation at the opening edge of the bolt insertion hole when the bolt is press-fitted.

[Brief description of the drawings]

FIG. 1 is a plan view of a work holding device according to an embodiment of the present invention.

FIG. 2 is a plan view of a pallet of the work holding device shown in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

4 is a plan view of a sub ring of the work holding device shown in FIG.

FIG. 5 is a plan view showing a positional relationship between a pallet and a sub ring of the work holding device shown in FIG. 1;

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a perspective view of a state where a bolt is inserted into a housing, as viewed from below.

FIG. 8 is a plan view showing a state where another sub ring is attached to the pallet shown in FIG. 2;

9 is a sectional view taken along the line IX-IX in FIG.

FIG. 10 is a perspective view of a part of the bolt press-fitting machine.

FIG. 11 is a plan view of the bolt press-fitting machine shown in FIG.

FIG. 12 is a sectional view taken along the line XII-XII in FIG. 11;

FIG. 13 is a longitudinal sectional view showing a part of the bolt press-in machine and the work holding device shown in FIG. 10;

FIG. 14 is a sectional view showing a state in which the press-in member of the bolt press-in machine shown in FIG. 13 is lowered.

FIG. 15 is a sectional view showing a state in which a support member of the bolt press-fitting machine shown in FIG. 13 is raised.

FIG. 16 is a perspective view showing a housing for a differential machine.

FIG. 17 is a perspective view showing a part of a conventional bolt press machine and a housing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 4 ... Opening 5 ... Bolt 10 ... Bolt press-in equipment 11 ... Work holding device 12 ... Bolt press-in machine 13 ... Pallet 14 ... Sub-ring 31 ... Bolt receiving hole 42 ... Rotating body 47 ... Rotating body drive mechanism 77 ... Pitch Feeding mechanism 80, 81 ... Press-fit unit 91 ... Press-fit member 100 ... Hydraulic cylinder 104 ... Support member

Claims (2)

[Claims] 1. A pallet capable of transporting a work having a bolt insertion hole at a peripheral edge of an opening, a positioning part detachable from the pallet and regulating a relative position with respect to the pallet, and the work. And a sub-ring having a bolt receiving hole formed at a position where a bolt temporarily placed in the bolt insertion hole of the work can be inserted. 2. A work holding device for holding a housing having a bolt insertion hole at a peripheral portion of an opening, a bolt press-in machine for press-fitting a bolt into the bolt insertion hole of the housing from inside the housing, The work holding device comprises: a pallet capable of transporting the housing; a positioning portion that is detachable from the pallet and regulates a relative position with respect to the pallet; And a sub-ring having a bolt receiving hole formed at a position where a bolt temporarily placed in the bolt insertion hole of the housing can be inserted, wherein the bolt press-fitting machine is provided with respect to the housing. A rotatable rotatable member, and a rotatable rotatable member provided in the rotatable member and inserted into a bolt insertion hole of the housing. A press-fitting unit having a press-fitting member capable of press-fitting a bolt and having a support member for supporting the sub-ring and having an actuator for relatively moving the press-fitting member and the support member; and And a pitch feed mechanism for moving to a position.