JPS5988222A - Jig exchanger - Google Patents

Abstract

PURPOSE:To make compact an exchanger for two jigs and to reduce a stand-by space, by using a driving shaft to move two jig holding mechanisms back and forth in the opposite directions to each other. CONSTITUTION:Screw robs 3b, 4b are provided in a casing 5 so that the rods are rotated in the opposite directions to each other by a motor 8 through gears 10, 3a, 4a. The screw rods 3b, 4b are screw-engaged with coupling bars 3c, 4c fitted with rods 3d, 4d which have mounting portions 3d1, 4d1. Two kinds of welding jigs are attached to the mounting portions 3d1, 4d1. The motor 8 is rotated forward and backward so that the rods 3d, 4d fitting with the jigs are moved back and forth in the opposite directions to each other to replace the jigs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jig conversion device for a welding jig or the like in an automobile body assembly device or the like.

BACKGROUND ART Conventionally, a jig converting device has been used in an automatic vehicle body assembly device, etc. because it is necessary to use a welding jig adapted to each vehicle model as the vehicle model changes.

For example, the device shown in FIG. 1 has bosses b that are rotatably attached to a horizontal shaft a that is supported by a support (not shown) erected on a pedestal, and that project from the bosses b at substantially right angles to each other. The two bosses) c and d are fixed as part of the jig, and the lever e protruding from the boss 5 face on the opposite side of the bosses) c and d is
A rod h of an actuator q, which is pivotally supported on a bracket f provided on a frame K, is connected to a pin i, and the bosses c and d are rotated around a horizontal axis a by the operation of the actuator q. By using a mechanism to stop the rotation of the horizontal axis a with one of the stoppers j provided on opposite sides of the horizontal axis a, the post that is not in contact with the post is positioned at a predetermined position, and the clamper ( (not shown) to hold the workpiece.

Next, in another conventional example shown in FIG. 2, two posts m are attached to the side surface of the tip of a support l that is erected on a pedestal K.

A rotary member p branched from n at a required angle is hinge-coupled, and an actuator is pivoted at the intermediate portion of the support l to a lever q that projects on the opposite side to the post m and n of the member p. The rods b of q are connected by a pin i, and the support l is provided with stoppers r and s for stopping the rotation of the posts m and n, respectively.

Similarly to the device shown in FIG. 1, this device also uses the operation of an actuator q to adjust the boss) m,
By positioning either one of n at a predetermined position, it is possible to exhibit a desired function.

However, with these conventional devices, when one jig is in a predetermined position, the other jig may interfere with the movement of the welding robot or the operator's operation of the welding gun.
In addition, the jig is rotated around a fixed fulcrum for switching, and a large air space is always required for waiting.

This invention was made in view of the above-mentioned problems, and involves reciprocating a pair of jig attachment mechanisms in opposite directions that are interlocked by a drive shaft installed in a housing via a gear. The purpose is to solve these problems by converting the predetermined position of the jig.

An embodiment of the present invention will be described below with reference to FIG. 3 and subsequent figures.

First, to describe the configuration, the jig conversion device basically consists of a housing 1, a drive mechanism 2. and A/B jig attachment mechanisms 3 and 4.

The housing 1 has a rectangular parallelepiped box shape and has a cover 6 bolted to the top of a sink 5.

In the drive mechanism 2, a motor 8 is mounted on the cover 6 via a deceleration unit 7, and a drive shaft 9 for transmitting the driving force of the motor 8 is penetrated through the cover 6 at a required location. It protrudes inward, and the main gear 10 is fixed to the tip.

The upper jig attachment mechanism 3 is pivotally supported by the bottom 5a of the casing 5 and the cover 6, and has an upper gear 3a that meshes with the main gear 10.
a screw rod 3b to which the screw rod 3b is fixed; a connecting bar 30 that is screwed into the rod 3b and moves up and down with the rotation of the rod 3b; and a connecting bar 30 that is attached to both parts of the bar 30 and that
It is configured by a pair of rods 3d that extend slidably through the housing 1 and protrude out of the housing 1, and have a mounting portion 3d at the tip of which the upper jig 13 is attached, and a pair of rods 3d that are formed so as to face outward. .

The slide bearing 3e that pivotally supports the upper end of the screw rod 3b comes into contact with and fits into the step 3bI formed at the upper end of the rod 3b, and is inserted into the spring hole a formed in the cover 6. The screw rod 3b is always urged downward by a compression coil spring 3f housed in the crest hole 6a.

The O-jig attachment mechanism 4 that attaches the O-jig 14 has almost the same configuration as the A-jig attachment mechanism 3, but the A-jig attachment mechanism 4 has a structure similar to that of the A-jig attachment mechanism 3. The screw rod 4'S is provided at a position symmetrical to the screw rod 4'S, and the screw rod 4'S is rotated in the opposite direction to the screw rod 3b by the meshing of the gear 4a with the gear 3a. Also, rod 4d
The attachment part 4d of the second jig 14 is the attachment part 3d of the first jig 13.
, are formed facing in the opposite direction. In Fig. 6, 15.16 is the fluid pressure cylinder that is swingably attached to the first jig 13 and the second jig 14, respectively, and 17°18 is attached to the tip of the piston rod of the cylinder 15.16. This is a clamp member.

Next, the operation will be explained 3. When the motor 8 is rotated in the forward direction, the main gear 10 is rotated in the forward direction (arrow A) via the deceleration unit 7.
The armor gear 3a meshing with 0 rotates in the opposite direction (arrow B),
Therefore, since the screw rod 3b also rotates in the same direction, the connecting bar 30 screwed into the rod 3b moves downward. Further, since the O gear 4a meshes with the A gear 3a, it rotates in the forward direction, and the screw rod 4b rotates in the opposite direction with respect to the screw rod 3b, so the connecting bar 40 rises symmetrically. Finally, when the connecting bar 30 contacts the bottom 5a of the casing 5, a limit confirmation signal is transmitted by means outside the device, the motor 8 is stopped, the cylinder 15 is activated, and the clamp member 17 is activated.
Clamp the workpiece W by 1. The compression coil spring 3f provided at the upper end of the screw rod 3b via a slide bearing 3e is compressed by the tightening locking action that occurs when the connecting bar 30 abuts the bottom portion 5a. This prevents it from being tightened more than the set force of 3f. Further, although the explanation is omitted, the lifting platform on which the upper jig 13 grips the workpiece W1 in a conventional manner does not apply excessive force to the workpiece W1 since the screw rod 3b has elasticity in the vertical direction due to the spring 3f. It has no effect.

To convert from the first jig 13 to the second jig 14, by rotating the motor 8 in the opposite direction, the mounting portion 3dt of the first jig 13 is raised by the reverse operation described above.

In contrast to this, the mounting portion 4 d + of the second jig 14 can be lowered to be in a position to grip the workpiece W2.

As explained above, according to the present invention, a pair of screw rods is configured to rotate in reverse rotation by connecting gears (by rotation of a drive shaft), and is fixed to the screw rods via a connecting bar. The rod for attaching the jig is moved backwards, and a compression coil spring is provided that constantly biases the screw rod toward the jig, making the device itself more compact than conventional devices and making it easier to fix the jig. It is possible to significantly reduce the airspace required for changing tools and waiting, so there is no interference with the movement of welding robots and welding work, and the effect is that the airspace for production can be expanded. Further, since the screw rod is held elastically, there is an advantage that no excessive force is applied to the workpiece, and the workpiece can be firmly gripped.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional jig conversion device, Fig. 2 is a front view of another conventional example, Fig. 3 is a partially sectional front view of the present invention, and Fig. 4 is a partially sectional front view of the present invention. A sectional side view, FIG. 5 is a bottom view, and FIG. 6 is an explanatory diagram showing the state of use of the present invention. １・・・・・・・・・・・・・・・・Housing 3...
・・・・・・・・・・・・・・・ Upper jig mounting mechanism 3a・
・・・・・・・・・・・・・・・ Upper gears 3b, 4b...
...Screw rods 3c, 4c...Connection bars 3d, 4d...Rod 3d1.4dt...Mounting part 3e... ...Slide bearing 3f
・・・・・・・・・・・・・・・Compression coil nokune 4・
・・・・・・・・・・・・・・・・B jig mounting mechanism 5
a・・・・・・・・・・・・Bottom 6・・・・・・
・・・・・・・・・・・・Cuck (-6a・・・・・・
・・・・・・・・・）；Nehole 9・・・・・・・・・・・・
...... Drive shaft 10,...
・Main gear Figure 3 Figure 4

Claims (2)

[Claims] (1) A combination of a main gear mounted on a drive shaft protruding into the housing, a jig mounting mechanism having a gear meshing with the main gear, and another jig mounting mechanism having a gear meshing with the gear, A jig conversion device characterized in that the jig attachment mechanisms are moved forward and backward in opposite directions by rotating the drive shaft. (2) The jig mounting mechanism fixes gears to the tops of two screw rods that are supported via compression coil springs and slide bearings in two spring holes drilled in the bottom of the casing and the cover, respectively. A pair of connecting bars, each of which is screwed downwardly so as to be movable up and down, protrudes through the bottom of the casing in a slidable manner and forms a mounting part for attaching a jig at the lower end. A jig converting device according to claim 1, which is formed by fixing a rod.