JPS62136329A - Work locating jig - Google Patents

Abstract

PURPOSE:To enable a plural number of plate shaped work to be located and held precisely, by providing clampers which are attached displaceably to gauge posts 15 and locate a work to a specified location under the cooperation of the gauge posts. CONSTITUTION:A subplate 13 is fixed on a jig base 12 by screw fastening, etc. and a plural number of gauge post 15 are installed through fixing brackets 14 at required locations on the subplate. Moreover, at the rear terminal portion of each gauge post 15, the intermediate portion of a clamper 17 is pivoted and this tip portion of the clamper 17 is made turnable at the position and in the direction whereby sufficient holding support of a work 16 is obtainable under the cooperation of the work supporting portion 15a. A cylinder 18 is installed, through a bracket 19 arranged to project down ward from a jig base 12 below the jig base 12. Moreover, respective one-side ends of wire cables 21 one untwisted 22 and connected to a common rod 20 via a connection link 23.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is useful for accurately positioning and holding a plurality of plate-shaped workpieces at predetermined positions when performing welding or other processing on the plate-shaped workpieces, for example. The present invention relates to an improvement of a workpiece positioning jig suitable for use.

(Prior Art) For example, a conventionally known jig of this type for positioning and holding two plate-shaped workpieces at a required relative position for welding on an automobile body assembly line is shown in FIG. a
), (b), and (C).

In the figure, 1 indicates a jig base supported on the legs, and 2 indicates a gauge post erected on the jig base. Each is firmly fixed on the jig base via a bracket 3 located on its negative side.

Furthermore, a clamper 4 is rotatably attached to the top of each gauge post 2, and the rear end of these clampers 4 is connected to the rod end of a cylinder 5 attached to the back of each gauge post 2. Each is connected by a hinge.

Note that each of these cylinders 5, which are often double-acting, has a flexible hose 7 connected to an air valve 6 on the jig base.
．． 7 are connected by the air supply and exhaust passages of the ponds, and by the backward operation of each cylinder rod 5a, the clamper tip is moved away from the top surface of the gauge post, in other words, the clamper is opened, and by the advancing operation, the gauge Each brings about an approach movement to the top of the post, ie a closing actuation.

To position and hold the plate-like workpiece in a predetermined position using such a workpiece positioning jig, two plate-like workpieces 8a, After arranging the cylinders 8b while maintaining a predetermined positional relationship, all the cylinders 5 are operated to close and close the respective clampers 4 at the same time,
By this operation of the clamper 4, the two workpieces 8a,
8b will be clamped in the desired relative relationship between it and the top of the gauge post 2.

Also, the plate-like workpiece 8 that is positioned and held in this way
The welding process for a and 8b is performed using, for example, electrode tips 9a and 9 of a porta-pull spot welding gun 9, as shown in the figure.
1), both workpieces 8a.

This is done by inserting the mutually contacting flange portions of the electrodes 8b at predetermined positions in the length direction, and then energizing the electrode tips 9a and 9b.

(Problem to be Solved by the Invention) However, in such a conventional workpiece positioning jig, since separate cylinders 5 are attached to all the gauge posts 2, the equipment cost of the jig is low. In addition to the problem that the number of cylinders 5 increases and the number of maintenance steps for each cylinder 5 increases, there is also the problem that the numerous air supply and exhaust passages for each cylinder 5 are extremely easily damaged by the welding gun 9. Moreover, since the diameter of each cylinder 5° is considerably larger than the plate thickness of the gauge post 2, the cylinder itself and its air supply/discharge path interfere with the welding gun 9, resulting in a significant decrease in work efficiency. Furthermore, there is another problem in that the diameter of the cylinder 5 restricts the arrangement of the gauge post 2 in close proximity to each other.

This invention was made by focusing on the problems of the prior art, and can sufficiently reduce equipment costs and maintenance man-hours, improve welding workability, and further improve The object of the present invention is to provide a workpiece positioning jig that can effectively eliminate damage to supply and discharge passages and restrictions on the placement position of gauge posts.

(Means for Solving the Problems) The workpiece positioning jig of the present invention has a plurality of gauge posts erected at desired positions on the jig base, and
Again, for example, by displaceably supporting each actuating member on each of these gauge posts,
The operating member can be rotated or moved back and forth with respect to the gauge post, and the workpiece can be positioned at a predetermined position through cooperation between the operating member and the gauge post. A means is provided, and the other ends of a plurality of cables, one end of which is connected to the forward/backward drive means, are connected to the respective actuating members so that the operation of the forward/backward driving means can be transmitted to the actuating members.

(Example) The present invention will be explained below based on illustrated examples.

FIGS. 1(a) and 1(b) are views showing an embodiment of the present invention, in which reference numeral 11 indicates a support leg, and 12 indicates a jig base fixed on a plurality of support legs 11. show.

Here, the sub-plate 13 is fixed onto the jig base 12 by screws or other means in order to make the portion located below the jig base 12 as a boundary to be able to be used as various gauge posts and clampers. , and a plurality or plurality of gauge posts 15 are installed at required positions on this sub-plate via the mounting bracket 14.
erected.

As is clear from the I-I arrow view, this gauge post 15 positions and supports a workpiece, for example, a plate-shaped workpiece 16, at its tip, and also supports the workpiece 16 at its tip.
Workpiece support portion 15a that contributes to clamping as described later in 6.
has.

Further, here, at the rear end of such a gauge post 15, an intermediate portion of a clamper 17, which is an example of an operating member, is pivotally supported on the top thereof, and the tip of this clamper 17 is
In cooperation with the workpiece support section 15a, the workpiece 16 can be rotated at a position and in a direction that can sufficiently hold the workpiece 16.

On the other hand, below the jig base 12, a cylinder 18 as an example of forward/backward driving means is disposed in an upright position via a bracket 19 provided to protrude downward from the jig base 12. , and this cylinder 18
A horizontally extending shared rod 20 is fixed to the tip of the upwardly facing piston rod 18a. As a result, the common rod 20 is raised and lowered while maintaining its horizontal position based on the movement of the piston rod 18a.

Here, from the common iron 20, the guide rod 20a
, 20a protrude downward as shown, and these guide rods 20a, 20a are provided in sleeves 19a, 19a provided on the bracket 19.
When the common rod 20 is penetrated through the common rod 20, sufficiently smooth vertical movement of the shared rod 20 can be ensured.

Furthermore, in this example, one end of each of a plurality of cables, such as wire cables 21, having appropriate rigidity and flexibility and sufficient thinness, preferably untwisting 22 and connection mechanism 23, is connected. provides an indirect connection between the wire cables 21 and the cylinder 18 by connecting to the common rod 20 via the cables 21 and the other end of each of the cables 21, also preferably attached to the gauge post 15. It is inserted through one or more cable guides 24 and connected to the rear end of the clamper 17.

Therefore, each wire cable 21 here, with rigidity and flexibility according to its requirements, moves the clamper 17 to its fulcrum based on the forward and backward movement of the common rod 20 and the cable itself caused by the operation of the cylinder 18. In other words, the clamper 17 can be appropriately closed and opened.

Here, in particular, in order to make the workpiece clamping force sufficiently large during the closing movement of the clamper 17, the diameter of the cylinder 18 connected to the air valve 25 via the air supply and exhaust pipes 26 and 26 is set as follows. Conditional expression: d: Cylinder diameter N in the prior art: It is preferable to determine so that an extra output corresponding to the opening resistance of each wire cable 21 can be produced while satisfying the number of cylinders in the prior art. On the other hand, if there is a possibility that the output of the cylinder 18 may be insufficient, the power of the cylinder 18 can be increased by connecting a hydro booster 27 to the head side of the cylinder 18, as shown by the imaginary line in the figure. You can also do that.

FIG. 2 is a side view showing a modification of the present invention, in which a workpiece support portion 15a is integrally formed on the gauge post 15, and the rear end portion of the clamper 17 is pivoted to the top of the bracket 28. Then, the end portion of the wire cable 21 is connected to a cable guide 24 provided on the bracket 28.
By connecting to the middle part of the clamper 17 through the
Contrary to the above example, the clamper 17 can be closed based on the backward movement of the piston rod 18a and thus the wire cable 21, and the clamper 17 can be opened based on the forward movement of the cable 21.

According to this example, the rigidity of the cable 21 is equal to the stiffness of the clamper 17.
Since it is sufficient that the cable 21 can be opened smoothly, its rigidity can be made considerably smaller than that of the above-mentioned example, and therefore, the cable 21 can be easily handled. .

In the workpiece positioning jig configured in this way, first, the gauge post 15 is placed in the open position of the clamper 17.
Position and place the plate-like workpiece 16 on the workpiece support section of
Then, the operation of the - cylinder 18 in either direction is controlled via each wire cable 21 to each clamper 1.
7 to cause the clampers 17 to perform a closing operation, and as a result, the plate-shaped workpiece 16 is clamped between the tip of each clamper 17 and the gauge post 15, etc., so that the plate-shaped workpiece 16 is held in a predetermined position. Reliable positioning and holding is performed.

Therefore, here, it is not necessary to install each cylinder for each gauge post 15, and in addition to being able to significantly reduce equipment costs and maintenance man-hours,
Decreased work efficiency due to interference between the attached cylinder and welding gun,
In addition, it is possible to completely eliminate restrictions on the installation position of the gauge post 15 due to mutual interference between adjacent cylinders.
．． 26 and cable 21 from being damaged due to interference with them.

Here, the sub-plate 13 is fixed on the jig base 12 by screws or other means, and the gauge post 15 is erected on this sub-plate.
While removing the sub-plate 13 from the jig base 12, remove the cable 21 from the clamper 17 or the untwisting 22.
By removing it from the jig base 12. cylinder 1
8 etc. can also be applied to sub-plates on which other gauge posts are installed, making it possible to further reduce equipment costs.

FIG. 3 is a side view showing still another embodiment of the invention.

In this example, for example, two gauge posts 15 and 15 are set upright at required positions on the sub-plate 13 at a distance from each other, and one of the gauge posts 15 (on the right in the figure) is attached to the upper end side part of the gauge post 15. A locate pin guide 29 is installed vertically, and the locate pin guide 29 supports the locate pin 30, which is an example of an operating member, in an upright position so as to be able to rise and fall freely, and the wire cable 21
is connected to the lower end of the locate pin 30 through the cable guide 24 provided on the gauge post 15. Also, on the top of the other (left side in the figure) gauge post 15,
The locate pin guide 29 is installed horizontally, and the locate pin guide 29 supports the locate pin 30 in its horizontal position so that it can move forward and backward. , the intermediate portion is connected to the lower end of an arm 31 pivotally supported on the gauge post 15, and the upper end of this arm 31 is connected to the rear end of a horizontally provided locate pin 30.

Furthermore, in this example, each locate pin 3,
The other end portion of each wire cable 21 connected to
As shown in FIG. 1, it is connected to the piston rod 18a of the - cylinder 18 via the common rod 20, and based on the operation of the cylinder 18, the double-ended cat pin 30 is raised and lowered via the wire cable 21, 21, respectively. and make it possible to advance and retreat. As a result, each locating pin 30 can enter and leave the positioning hole provided in the plate-like workpiece 16, thereby positioning the plate-like workpiece 16 and releasing it from that position.

Although the present invention has been described above based on the illustrated examples, the reciprocating drive means may be a hydraulic or pneumatic cylinder, or may be a known reciprocating means using a screw mechanism, gear mechanism, etc. , the number and shape of the gauge posts can be changed as required.

Further, in the embodiment shown in FIG. 2, when the clamper 17 is biased in the opening direction by a spring or the like, the rigidity of the cable 21 can be significantly reduced.

(Effects of the Invention) Therefore, according to the present invention, in particular, by connecting the forward/backward drive means of - to the actuating member via a plurality of cables, equipment costs and maintenance man-hours can be significantly reduced. , effectively prevents interference between the drive system of the operating member and the welding gun and other drive systems, as well as interference with each other, thereby improving work efficiency, preventing damage to the drive system, and providing freedom in arranging gauge posts. can be sufficiently increased.

[Brief explanation of drawings]

FIG. 1(a) is a diagram showing one embodiment of this invention, FIG. 1(b) is a view taken along the line II in FIG. 1(a), and FIG. 2 is a diagram showing another embodiment of this invention. 3 is a side view showing still another embodiment of the present invention, FIG. 4(a) is a view showing a conventional example, and FIG. 4(b) is a side view showing a conventional example, and FIG. The perspective view, Figure 4 (C) is the same figure (a
) is a view taken along arrow B-8. 12... Jig base 13... Sub plate 15... Gauge post 16... Plate work 1
7... Clamper 18... Cylinder 18a
...Piston Rondo 20...Common Rod 21...
・Wire cable 24...Cable guide 25・
...Air valve 26...Air supply and exhaust pipe 29...
・Locate pin guide 30... Locate pin patent applicant Nissan Motor Co., Ltd. Figure 2

Claims (1)

[Claims] 1. A plurality of gauge posts (15) erected at predetermined positions, and a plurality of gauge posts (15) that are displaceably attached to each gauge post and position the workpiece (16) at a predetermined position in cooperation with the gauge posts. an actuating member (17) and one advance/retreat drive means (
18), and a plurality of cables (21) whose one end is connected to the forward/backward driving means and the other end is connected to each operating member to transmit the operation of the forward/backward driving means to the operating member.
A workpiece positioning jig equipped with.