JPH10156643A - Distance adjusting device of fastening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately adjust the distance between a pair of fastening machines without fluctuation. SOLUTION: Fastening machines R, R are attached to guide shafts 2, 2 arranged in the direction perpendicular to the axes of the fastening machines R through supporting blocks 3, 3, reaction to be generated in fastening is received by the guide shafts 2, 2, to prevent the error of the interval. A guide plate 8 is axially displaced by a ball screw 6 parallel to the fastening machines R, cam followers 4 are engaged with cam grooves 9, 9 formed on the surface of the guide plate into chevron shapes, and the distance between axes of the fastening machines R is reliably adjusted without fluctuation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device capable of arbitrarily adjusting the distance between tightening machines.

[0002]

2. Description of the Related Art For example, when a connecting rod cap is connected to a large end of a connecting rod, usually, two bolts on the left and right sides are simultaneously tightened to make the stress applied to the work uniform and to assemble them together. The time required for attachment is shortened. By the way, in general, a pair of tightening machines used for this kind of application are rotated by rotating a screw shaft arranged in a direction perpendicular to the axis of the tightening machine so as to cope with a change of the model or the like. Although it is configured to be able to adjust the spacing of the arbitrarily, this type of device, as a result of the large torque and reaction force applied at the time of bolt tightening directly acting on the helical shaft, bending the helical shaft,
The disadvantage of long-term use is that the spacing between the tightening machines is disturbed.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is an object of the present invention to provide a new distance adjusting device which does not cause a deviation between the tightening machines.

[0004]

That is, the present invention provides a spacing adjusting device for a tightening machine for achieving the above object, in which a support block is provided on a guide shaft arranged in a direction perpendicular to the axis of the tightening machine. , A pair of tightening machines are slidably mounted on the shaft, while a cam plate is movably mounted on a screw shaft arranged in a direction parallel to the axis of the tightening machine, and the shaft is provided on the cam plate. A cam follower integrated with each of the support blocks is engaged with each of a pair of symmetrical cam grooves having an angle in the direction.

[0005]

Embodiments of the present invention will be described below. The drawings all show one embodiment of the present invention. In the figure, two guide bars 2, 2 are attached in parallel to a base indicated by reference numeral 1, and here, the base ends of the two tightening machines R, R are connected to the guide bars 2, 2, respectively. Support blocks 3, 3 for supporting in orthogonal directions are slidably mounted.

On the other hand, a ball screw 6 driven by a servomotor 5 is disposed on the base 1 in a direction parallel to the tightening machine R, that is, in a direction perpendicular to the guide bars 2 and 2. Has a cam plate 8 to be described later.
And a support plate 7 integrated with a nut 11 so as to be movable and adjustable.

The above-mentioned cam plate 8 is for changing the distance between the shafts of the tightening machines R. This cam plate 8 is connected to the ball screw 6 via an integral support plate 7 and further has a plate guide 10. Is driven by the servo motor 5 while being guided, and is configured to be movable and adjustable in the longitudinal direction of the tightening machine R. Further, on its surface, a cam groove 9, 9 having a "C" shape, that is, a shallow opening in the axial direction is provided. The cam plate 8 is moved while the cam followers 4, 4 fixed to the support blocks 3, 3 are engaged with the cam grooves 9, 9, respectively. By doing so, the interval between the two tightening machines R, R can be arbitrarily changed.

In the embodiment constructed as described above, if it becomes necessary to change the interval between the two tightening machines R, R in order to cope with a change in the model of the connecting rod, first, the servo motor 5 And the cam plate 8 is returned to the home position via the nut 9 screwed into the ball screw 6 and the support plate 7 integrated therewith.

Then, when the servo motor 5 is rotated forward by an amount corresponding to the distance between a pair of bolts inserted through both sides of the large end of the connecting rod, the cam plate 8 is proportional to the rotation of the servo motor 5. For example, the cam followers 4 and 4 engaged with the pair of cam grooves 9 and 9 opened in a U-shape are displaced to the right and left from the origin position to the right in FIG. Through these cam followers 4,
The distance between each of the tightening machines R, R integral with 4 is moved and adjusted by this amount.

In this state, when the tightening machines R, R are fitted to the bolts of the connecting rods and tightened, most of the axial reaction force generated at that time is reduced by the tightening machines R, R. Are firmly received via the support blocks 3 and 3 by the two guide bars 2 and 2 attached in a direction perpendicular to the axis, and the remaining reaction force is transmitted by the cam followers 4 and 4
Transmitted to the cam plate 8 through the cam grooves 9 and 9,
This reaction force is applied to the tightening machines R, R via the support plate 7.
The cam screw 8 is received in the axial direction by the ball screw 6 in a direction parallel to the axial direction, and the axial movement of the cam plate 8 is also suppressed by friction between the screw groove and the axial distance between the tightening machines R and R fluctuates. Prevent from doing so.

[0011]

As described above, according to the present invention, a pair of tightening machines are slidably mounted on the guide shaft arranged perpendicular to the shaft of the tightening machine via the support block. The axial reaction force generated when the bolt is tightened can be reliably received by the guide shaft.

In addition, a cam plate is displaceably mounted on a screw shaft in a direction parallel to the axis of the tightening machine, and a pair of axially inclined cam grooves formed on the cam plate are provided. Since the distance is adjusted by displacement, the distance between the tightening machines can be precisely adjusted through the cam plate displaced by rotating the screw shaft and the cam groove, and at the time of bolt tightening. A part of the reaction force generated in the axial direction of the screw shaft,
In addition, the displacement of the cam plate is suppressed by friction between the screw shaft and the displacement of the tightening machines can be prevented beforehand.Furthermore, by providing the interval adjusting mechanism on the side of the tightening machine. This makes it possible to reduce the size of this type of device in the longitudinal direction and make it more compact.

[Brief description of the drawings]

FIG. 1 is a top view of an apparatus showing one embodiment of the present invention.

FIG. 2 is a side view of the same device.

FIG. 3 is a diagram showing the same device as viewed from the back.

[Explanation of symbols]

 2 Guide shaft 3 Support block 4 Cam follower 5 Servo motor 6 Ball screw 8 Cam plate 9 Cam groove R Tightening machine

Claims (1)

[Claims] 1. A pair of tightening machines are slidably mounted on a guide shaft arranged in a direction perpendicular to the axis of the tightening machine via a support block, while being parallel to the axis of the tightening machine. A cam plate is mounted on the provided screw shaft so as to be movable and adjustable, and a cam follower integrated with each of the support blocks is provided in each of a pair of target-shaped cam grooves provided in the cam plate and having an angle in the axial direction. And a gap adjusting device for a tightening machine.