JPH0453867Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of devices that apply torque to bolts or nuts when bolting rotatable mechanical parts to each other.

Therefore, in this invention, the nut runner, which applies torque to the bolt or nut when bolting rotatable members to be fastened, is installed on the base via a displacement device, and the nut runner is moved to the desired position. This invention relates to a bolt/nut fastening device that can be moved freely by combining the movements of the moving units in multiple directions of the displacement device when moving it to the tightening position. An arm is provided to extend from the rotation axis of the dynamic moving unit, and a copying plate is provided on the arm via a rod for the bolt/nut mounting surface. This invention relates to a bolt/nut fastening device in which the nut runner is moved along with the rotating shaft by an angle.

<Prior Art> As is well known, it is necessary to assemble each component accurately and quickly at the manufacturing site of various mechanical devices, and for this reason, various specialized assembly devices have been proposed in the past. It was released and put into actual use.

Among these, nut runner devices, which rotate bolts and nuts at high speed by motor drive, have been used in many places in recent years, and are particularly used in automobile assembly lines and other lines to save labor and speed up line tact. It is being used effectively due to the need to
The technology of the nut runner device used here is
For example, it is disclosed in Utility Model Application Publication No. 175328/1983.

Therefore, when assembling a car equipped with an automatic transmission, the torque converter of the automatic transmission and the drive plate attached to the engine crankshaft are fastened together using multiple bolts. However, since the outer periphery of the bolt tightening part has a complicated structure, it is recommended that the worker select a location that is relatively easy to work in and use a wrench to tighten the bolts one by one. It had been.

In addition, select a location with a relatively large working space around the joint between the torque converter and the drive plate, tighten the bolts one by one using a hand-held nut runner, and rotate the engine crankshaft accordingly. In some cases, the bolt mounting positions of the torque converter and drive plate are sequentially moved, and all bolts are tightened in the same manner.

<Problem that the invention seeks to solve> However, in the former method, where the worker tightens the bolts one by one with a wrench, the worker inserts the bolt into the socket of the wrench each time and leaves it in that state. The problem is that the work is extremely cumbersome because the bolt must be brought to the tightening position and the tip of the bolt must be aligned to the tightening position while the tightening work is being performed. There was a problem that the workability was poor due to the narrow space.

Furthermore, compared to the former method, the latter method of tightening the bolts with a hand-held nut runner eliminates the need for the worker to apply torque to the bolts, but it does not require the worker to apply torque to the bolts. Since the nut runner must be carried to the set position of the drive plate (drive plate) and positioning work must be carried out there, there was a problem in that the work burden was heavy on the worker and the work efficiency was poor.

Accordingly, in the applicant's earlier application, the nut runner is placed and fixed on the base via a displacement device, and rotated as in the case of connecting the drive plate of an engine and the torque converter of an automatic transmission. There is a bolt/nut fastening device that is capable of semi-automatically performing bolt fastening work when fastening freely fastened members with bolts.

This bolt/nut fastening device places and fixes the nut runner on the base via a displacement device, and also locks displacement of the nut runner in directions other than the tightening forward and backward directions with a position fixing device. When tightening the second bolt or nut, the worker manually positions the nut runner at the bolt/nut installation position using a displacement device, and when the worker finishes the first tightening and moves on to the second and subsequent bolts. , after locking the position fixing device,
The nut runner is moved back in the tightening advance/retreat direction, and from that state, the member to be fastened is rotated by a set angle and the nut runner tightens the second and subsequent bolts and nuts alternately.

However, this bolt/nut fastening device has 1
When a worker manually positions the nut runner at the second bolt/nut installation position, the worker should be able to relatively easily move the nut runner forward/backward, left/right, and up/down to align it visually. However, it is extremely difficult for an operator to visually check the positioning movement of the nut runner in the horizontal rotation direction, that is, to install the bolts and nuts held by the nut runner at the correct angle. There was a problem that the time loss was large.

Incidentally, although this is not currently a technology for a bolt/nut fastening device for a rotating body, there is a technology for a similar screw tightening device as disclosed in Japanese Utility Model Application No. 60-138619.

The purpose of this invention is to solve the above-mentioned conventional problem of fastening bolts and nuts to rotating bodies. We have developed an excellent bolt and nut fastening device that mechanically guides the positioning work and makes it extremely easy to reduce the burden on workers and improve productivity. This is what we intend to provide.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of this invention, which is based on the above-mentioned claims for utility model registration, is to replace the bolt or nut with a nut runner. With the nut runner loaded, the operator moves the nut runner three-dimensionally through the longitudinal movement unit, width direction movement unit, vertical movement unit, and horizontal rotation direction movement unit of the displacement device installed on the setting base. When freely moving and positioning the bolt/nut installation position, first operate the widthwise advance/retreat device on the fixed part of the widthwise moving unit and move the copying plate via the connecting rod held at its tip. By displacing the plate in the direction of the bolt/nut mounting surface and pressing the copying plate into contact with the bolt/nut mounting surface while rotating horizontally relative to the connecting rod, the rotation axis of the horizontal rotation direction moving unit can be moved to the width direction moving unit. At the same time, as the rod extends, it is rotated by the same angle as the inclination angle of the copying plate, and the nut runner held on the rotating shaft is automatically adjusted to rotate by the same angle as the copying plate. furthermore, in that state, the longitudinal movement unit,
A technical measure is taken in which the operator adjusts and moves the widthwise moving unit and the vertically moving unit to align the nut runner with the bolt/nut mounting position of the member to be fastened.

<Example> Next, an example of this invention will be described below based on the drawings.

1 is a bolt/nut fastening device that forms the gist of this invention, and in this embodiment, an automatic transmission 2 is used in an automobile assembly process.
A mode used when fastening the torque converter 3 and the drive plate 4 of the engine using a plurality of bolts 5, 5, . . . is shown.

In FIG. 2, 6 is a base installed on the floor, and a pair of rails 7, 7 running in the front-rear direction (left-right direction in FIG. 2) are laid on the upper surface of the base 6. A front and rear slide plate 9 is slidably installed on the rails 7, 7 via linear bearings 8, 8, . A pair of stays 11, 11 each having a positioning roller 10 are fixedly installed therein.

A pair of rails 12, 12 running in the width direction (in the front and back directions of the paper in FIG. 2) are laid on the upper central surface of the front and rear slide plate 9, and on the rails 12, 12, linear bearings 13, 13, . . .
A width slide plate 14 is installed through the front and rear slide plates 9, and a pair of rails 16, 16 for sliding a bracket 15, which will be described later, in the width direction is provided on the front upper surface of the front and rear slide plates 9.

As shown in FIG. 3, a support column 18 is erected on the front upper surface of the width slide plate 14 with a mounting plate 17 interposed therebetween. 19,1
A sleeve 20 serving as a rotating shaft is rotatably mounted via a rotary shaft 9, and a rotating plate 21 and an L-shaped arm 22 shown in FIGS. 1 and 2 are integrally fixed to the outer surface of the lower end of the sleeve 20. , a flange 23 is integrally fixed to the outer periphery of its upper end.

Furthermore, a lower end flange 25 of a cylindrical body 24 is fixed to the flange 23, and bearings 26, 26 and a collar 27 are attached to the cylindrical body 24 as shown in FIG.
A hollow shaft 28 is rotatably mounted through the hollow shaft 28, and a ball spline shaft 30 is installed inside the hollow shaft 28 through a bearing 29 so as to be slidable forward and backward.The hollow shaft 28 has a brake plate 31 at one end thereof. The base end of the ball spline shaft 30 is joined together with the base end of the lever 32, and the base end of the lever 32 is joined to the other end, and the base plate 34 is joined to one end of the ball spline shaft 30 via the bracket 33, and the base end of the stay 35 is joined to the other end. A cylinder 37 is fixed to the tip of the stay 35 as a device for moving the nut runner 36 forward and backward, and its rod 38 is connected to the lever 32.

And the hollow shaft 28 and the ball spline shaft 30
Since the hollow shaft 28 is mounted on the cylindrical body 24 via bearings 26, 26, it can freely rotate relative to the cylindrical body 24 while being integrated.

Further, the tip of the lever 32 is connected to the rear upper surface of the rotary plate 21 via a balance cylinder 39, and by the action of the balance cylinder 39, the inertia force due to the weight member attached to the base plate 34 is transferred to the hollow shaft 28 and the ball spline. It is designed not to greatly affect the rotational movement of the shaft 30.

Further, as shown in FIG. 3, a rail 40 is laid on the upper surface of the rear end of the rotary plate 21 that is integrally fixed to the sleeve 20, and a cylinder installation base 42 is connected to the rail 40 via a linear bearing 41.
A rotary lock cylinder (not shown) having a pad at the tip and a pad 43 facing the pad are fixed on the upper surface of the cylinder installation base 42, and the rotary lock cylinder has a hollow shaft. 2
8 and ball spline shaft 30 are at a desired rotation angle, the pad moves forward and first comes into contact with the brake plate 31,
Due to the reaction force, the pad 43 and the cylinder installation base 42 move backward through the rail 40 and the linear bearing 41, and the pair of opposing pads press and hold the brake plate 31, and the hollow shaft 2
8 and the ball spline shaft 30 are locked at a predetermined position.

Furthermore, the rotating plate 21 is connected to a cylinder with a locking mechanism (not shown) installed on the mounting plate 17, and the rotational lock of the sleeve 20 is locked at a desired position when the sleeve 20 is appropriately rotated with respect to the mounting plate 17. It is made possible.

Therefore, as shown in FIG. 4, the base plate 34
linear bearings 44, 44... are attached to the surface opposite to the ball spline shaft 30, and the plate 45 is slidably engaged with the rails 46, 46 of the plate 45 via the linear bearings 44, 44... A front and rear slide base 47 is fixed at right angles to the plate 45, and a slide lock cylinder 48 is fixed to the end of the base plate 34, and the slide lock cylinder 48 is attached to the tip thereof. By pressing the pad (not shown) made into contact with the plate 45,
The plate 45 and the front-back sliding movement of the front-back sliding base 47 are locked.

A rodless cylinder 50 is installed on the upper surface of the front and rear slide base 47 via brackets 49, 49.
The movable part 51 of 0 has a substantially L-shaped moving plate 52.
is fixedly installed, and a rail 5 is provided between the upper surface of the tip of the movable plate 52 and the lower surface of the front and rear slide base 47.
3 and a linear bearing 54 are interposed so that the movable plate 52 and the front and rear slide base 47 can be relatively slidably moved by the drive of the rodless cylinder 50.

A nut runner 36 is supported and fixed on the lower surface of the movable plate 52 via brackets 55, 55, as shown in FIG.

A bracket 56 is fixed to the upper surface of the front end of the front and rear slide base 47, a cylinder 57 and a linear bearing 58 are attached to the bracket 56, and a magazine base 60 is fixed to the tip of the rod 59 of the cylinder 57. The magazine base 60
is slidably engaged with a linear bearing 58 attached to the side of the bracket 56 via a rail 61, and a bolt magazine 62 loaded with a set number of bolts 5, 5... can be freely attached and removed. Further, when the bolt magazine 62 is attached, the magazine base 60 is moved forward and backward by the operation of the cylinder 57 and the slide of the linear bearing 58 and the rail 61.

As shown in FIGS. 1 and 2, an L-shaped plate 22 is fixed to the sleeve 20 as a rotating shaft.
has a reinforcing rib 63 joined to its inner side, and bearings 64, 64 are attached to its outer surface on the tip side, and one rod 65 is slidably attached to the bearings 64, 64 (a rod 65 is inserted from the bearings 64, 64). 6
A profiling plate 67 is integrally fixed to the distal end of the rod 65 via a bracket 66.

The copying plate 67 has a concave shape 68 on its upper side to prevent interference with the nut runner when aligning with the tightening position of the first bolt or nut. Another bracket 69 is provided protruding from the above-mentioned flatket 66 that holds the base.
The tip of a connecting rod 70 is connected to 9 via a pin 71 so as to be horizontally rotatable.

A pair of rails 16, 16 laid on the front upper surface of the front and rear slide plate 9 is connected to a slide plate 73 via linear bearings 72, 72.
is installed so as to be slidable in the width direction, and a bracket 15 having a bearing 74 at the upper end is installed on the upper surface of the slide plate 73.

The connecting rod 70 is held in a bearing 74 of the bracket 15 in a slidable manner (the length from the bearing 74 to the tip of the connecting rod 70 is telescopic).
A pin 75 having an upwardly tapered shape is fixed to the base end thereof.

Moreover, on the upper surface of the front and rear slide plate 9,
A cylinder 77 as a movement device in the width direction is installed on the side (upper side in FIG. 1) of the rails 16, 16 via a bracket 76, and the tip of the rod 78 of the cylinder 77 is connected to the bracket 15. ing.

Therefore, the bracket 15 is slid on the rails 16, 16 via the linear bearings 72, 72 by the force applied from the cylinder 77 in the forward and backward directions.

Further, a cylinder 79 is fixed to the lower surface of the movable plate 52 located on the base end side of the nut runner 36, and a bracket 82 having a tapered groove 81 is attached to the rod 80 of the cylinder 79.
When the cylinder 79 is operated and its rod 80 is extended, the pin 7 is inserted into the tapered groove 81 of the bracket 82.
5 is fitted into engagement so that the connecting rod 70 is connected to the moving plate 52 at the base of the nut runner 36.

In this embodiment, the base 6, the rails 7, 7, the linear bearings 8, 8..., the front and rear slide plates 9, etc. move the unit in the front and rear direction, and the front and rear slide plates 9, the rails 12, 1
2. The width direction moving unit is moved by the linear bearings 13, 13..., the width slide plate 14, the bearings 29, 29, the ball spline shaft 30, etc., the cylinder body 24, the bearings 26, 26, the hollow shaft 2
8 etc., move the vertically moving unit to the support column 1.
8, bearings 19, 19, sleeve 20, etc. each constitute a horizontal rotation direction moving unit, and the sleeve 20 is the rotation axis of the horizontal rotation direction movement unit, and the front and rear slide plates 9
constitutes a fixed portion of the widthwise moving unit, and the width slide plate 14 constitutes a movable portion of the widthwise moving unit.

Further, 83 in the figure indicates a conveyance tray.

In the above configuration, when fastening the drive plate 4 of the engine and the torque converter 3 of the automatic transmission 2 with the bolts 5, 5, etc., first, the engine and automatic transmission 2 are prepared for connection. Secure and crank pulley mounting bolts (not shown)
A rotating device (not shown) is connected to the bolt fastening device 1, and the bolt/nut fastening device 1 of this invention is set to the side of the bolt fastening device as shown in FIG.

Next, the front and rear slide plates 9 of the bolt/nut fastening device 1 are appropriately moved via the rails 7 and linear bearings 8, 8 by driving a moving cylinder device (not shown), and the stays 11, 11 are attached to the front ends of the slide plates 9. The rollers 10, 10 provided through the rollers 10, 10 are fitted into positioning grooves (not shown) of the tray 83 for conveying the automatic transmission 2 and positioned.

The bolt/nut fastening device 1 and the transport tray 83 are positioned relative to each other as described above, but generally the transport tray 83, the engine and transmission 2 mounted on its upper surface are are not positioned accurately, there is some variation in the relative positional relationship between the bolt/nut fastening device 1, the engine, and the transmission 2. The variation (actual inclined surfaces relative to each other based on the case where the engine and the transmission 2 are installed exactly parallel to the bolt/nut fastening device 1) will be explained as θ.

Therefore, the bolt magazine 62 is attached to the magazine base 60 on the movable plate 52 by the operator in advance.
is attached, and in this state, the cylinder 57 is actuated to move the bolt magazine 62 forward and backward as appropriate to supply bolts to the tip of the nut runner 36 which is in the retracted state.

Then, attach the bolt 5 to the tip of the nut runner 36.
is clamped, the cylinder 7 provided on the movable plate 52 at the base of the nut runner 36
9 to lower the bracket 82 at the tip, and taper groove 8 provided in the bracket 82
The pin 75 at the proximal end of the connecting rod 70 is fitted and connected to the rodless cylinder 5 in this state.
0 to move the connecting rod 70 forward together with the nut runner 36.

At this time, since the rod 65 is connected to the connecting rod 70 via the pin 71, the bearing 64,
64 and advances together with the nut runner 36.

Next, from the state shown in FIGS. 1 and 5, the cylinder 77 on the front and rear slide plate 9 is operated, and the bracket 15 connected to the rod 78 and
Slide plates 73, 73 to rails 16, 16
and the linear bearings 72, 72 are gradually moved back, and the bearings 7 are placed on the upper surface of the bracket 15.
a connecting rod 70 held via a pin 71; and a rod 6 connected to the connecting rod 70 via a pin 71.
5 are moved back together (moved upward in Figures 1 and 5).

At this time, the bearing 6 that holds the rod 65
4 and 64 also receive a force in the backward direction from the rod 65, and the sleeve 20 is moved together with the width slide plate 14 through the L-shaped arm 22 and the reinforcing rib 63, and the rails 12, 12 and the linear bearing 1.
3, 13... Retreat through the slides.

Then, the rod 65 receives the force of the cylinder 77.
When the cylinder 77 retreats by a predetermined amount, one end of the copying plate 67 comes into contact with the end surface of the transmission 2. When the cylinder 77 moves backward further, the copying plate 67
rotates by an angle θ about the pin 71, as shown in FIG.

The rotation of the copying plate 67 is caused by the sliding extension of the rod 65 via the bearing 64, the width slide plate 14, the linear bearing 13,
13..., and operations such as sliding the sleeve 20 backward via the rails 12, 12, and rotating the sleeve 20 in the horizontal direction via the support columns 18 and bearings 19, 19 are performed in a combined manner. When the sleeve 20 is rotated in the horizontal direction, the sleeve 20
By setting the copying plate 67 so as to always form the same relative angle via the L-shaped arm 22, the bearings 64, 64, the rod 65, etc.,
The rotation is performed by the same angle as the rotation angle of the copying plate 67, that is, by the angle θ.

At this time, when the sleeve 20 rotates by an angle θ, the nut runner 36 held at its upper part via the cylinder body 24, ball spline shaft 30, base plate 34, moving plate 52, etc., rotates by the same angle (angle θ). The bolt 5 rotated in the horizontal direction and held at the tip of the nut runner 36 becomes perpendicular to the end face of the transmission 2, that is, aligned with the direction of the bolt mounting hole of the drive plate 4.

Next, install the mounting plate 1 on the front and rear slide plate 9.
A cylinder with a locking mechanism (not shown) installed at 7 is operated to lock the rotational position of the rotary plate 21 connected to the cylinder, and the sleeve 20 integrated with the rotary plate 21 is fixed to lock the copying plate 67 and the nut runner. The horizontal rotation angle of cylinder 79 is fixed in this state, and then the rotation angle of cylinder 79 is fixed.
is operated backward to release the direct connection between the movable plate 52 at the base of the nut runner 36 and the rod 70.

Next, the nut runner 36 is manually moved by the worker in each direction (back and forth, left and right, and up and down (vertical rotation)) as appropriate (the horizontal rotation direction is locked as described above), and the nut runner 36 is rotated. The bolt 5 held at the tip of the drive plate 4 is positioned and inserted into the bolt mounting hole of the drive plate 4.

Also, after the first bolt 5 is inserted into the bolt mounting hole of the drive plate 4 as described above,
At the same time as driving the nut runner 36 and rotating the bolt 5, the cylinder 3 acts as a follow-up advance/retreat device.
7 and screw the first bolt 5 into the drive plate 4 and torque converter 3.

Next, when the first bolt 5 has been fastened, the slide lock cylinder 48 and the rotation lock cylinder (not shown) are operated to lock the movement in the longitudinal direction and the vertical rotation direction. , so that the nut runner 36 can move only in the width direction, that is, in the tightening direction of the bolt 5, and the nut runner 36
After unclamping bolt 5 from 6, cylinder 3
7 causes the nut runner 36 to retreat.

Next, the drive plate 4 and the torque converter 3 are precisely positioned by a rotating device (not shown) connected to the engine crankshaft via a crank pulley mounting bolt (not shown). the nut runner 36, so that the next bolt mounting hole in the drive plate 4 is precisely aligned with the position of the nut runner 36 that has just been retracted.

On the other hand, the retracted nut runner 36 is retracted by a predetermined amount in the longitudinal direction via the rodless cylinder 50, and in this state, the bolt magazine 62 is moved forward and backward as appropriate to move the next bolt 5 from the bolt magazine 62 to the tip of the nut runner 36. supply to.

When the next bolt 5 is clamped to the nut runner 36, the nut runner 36 is again advanced through the rodless cylinder 50, and the second bolt 5 is moved to the drive plate 4, as in the case of the first bolt 5 described above. And, it is screwed and fixed to the torque converter 3.

Thereafter, a plurality of bolts 5 . is returned to its initial position, the front and rear slide plates 9 are moved back, and the work is completed.

When the last bolt 5 is fastened and the nut runner 36 is moved backward using the rodless cylinder 50, the cylinder 77 on the front and rear slide plate 9 is moved forward before the rodless cylinder 50 is operated. to return the rod 65 and the connecting rod 70 to the initial setting state shown in FIGS.
2 and the pin 75 to connect the movable plate 52 and the connecting rod 70, and from this state, by moving the rodless cylinder 50 backward, the connecting rod 70 and the rod 6 are connected together with the nut runner 36.
Slide 5 back.

It goes without saying that the embodiment of this invention is not limited to the one embodiment described above, and various other embodiments can be adopted.

<Effects of the invention> As described above, according to this invention, even when the work space is relatively small, the positioning work of bolts and nuts relative to the mounting position of the fastened member can be performed by mechanically guiding the work. Bolts and nuts can now be fastened accurately and quickly,
As a result, the excellent effects of reducing the workload on the worker and reliably improving production efficiency are achieved.

That is, since the nut runner is installed on the setting base via a displacement device consisting of a longitudinal movement unit, a width direction movement unit, a vertical movement unit, and a horizontal rotation direction movement unit, it is difficult for the operator to operate the nut in a narrow space. There is no need to position and install bolts and nuts while holding the runner, and by moving the displacement device three-dimensionally to the desired position, you can position and install bolts and nuts. Moreover, in that case, the rotation axis of the horizontal rotation direction moving unit is installed on the movable part of the width direction movement unit, and an arm is extended on the side of the rotation axis, and the rod held by the arm is Since the copying plate for the bolt/nut mounting portion of the fastened member is fixed at the tip, the rotating shaft can be moved in the width direction simply by pressing the copying plate into contact with the bolt/nut mounting portion of the fastened member. At the same time as the unit moves backward together with the movable part, it rotates in accordance with the inclination angle of the copying plate (the inclination angle of the fastened part), and the nut runner held by the displacement device (including the rotating shaft) automatically moves the fastened part. The effect is that the angle is adjusted to correspond to the inclination angle of .

In addition, a connecting rod is horizontally rotatably supported at the rear of the base of the copying plate, and the connecting rod is held by the widthwise advancing and retracting device on the fixed part of the widthwise moving unit, so that the widthwise advancing and retreating device can be moved easily. When activated, a constant force is applied to the rear of the base of the copying plate in the direction of the fastened member via the connecting rod, and the copying plate connects the arm and rod to the rotating shaft around the pivot point with the connecting rod. As a result, the horizontal rotation angle of the nut runner can be adjusted with constant high precision.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention,
FIG. 1 is a plan view, FIG. 2 is a side view, FIG. 3 is a partially sectional front view showing the horizontal rotation direction moving unit, FIG. 4 is a front view showing the widthwise moving unit and the vertical moving unit, and FIG. Figures 5 and 6 are schematic plan views showing the operating state of the main parts. 3, 4... Member to be fastened, 5... Bolt, 36...
... Nut runner, 6, 7, 8, 9... Back and forth direction moving unit, 9, 12, 13, 14, 29, 3
0... Width direction moving unit, 24, 26, 28...
...Vertical direction moving unit, 18, 19, 20...
Horizontal rotation direction movement unit, 1... Bolt/nut fastening device, 20... Rotating shaft, 14... Movable part,
22... Arm, 65... Rod, 67... Copying plate, 70... Connection rod, 9... Fixed part,
77...Width direction advance/retreat device.

Claims (1)

[Scope of utility model registration request] A nut runner that applies torque to a plurality of bolts and nuts arranged on a rotatable member to be fastened is mounted and fixed on a base via a displacement device, and the displacement device is a unit that moves in the longitudinal direction and a unit that moves in the width direction. In a bolt/nut fastening device comprising a vertically moving unit and a horizontally rotating unit, the rotating shaft of the horizontally rotating unit is installed on the movable part of the widthwise moving unit, and a side surface of the rotating shaft is installed. A rod is telescopically held by the extending arm, and a copying plate for the bolt/nut mounting portion of the fastened member is fixed at the tip of the rod, and the tip of the connecting rod is attached to the rear of the base of the copying plate. A bolt/nut fastening device, characterized in that the bolt and nut fastening device is horizontally rotatably supported, and the base of the connecting rod is held by a widthwise advance/retreat device on a fixed part of a widthwise moving unit.