JPH0485212A - Pallet positioning jig - Google Patents

Abstract

PURPOSE:To make an accurate positioning by restraining the movement of a stopper while a jig body, which is loaded with pallets moving between conveyors carrying workpiece in and out, is guided by a pair of supporting plate on its both sides and a guide rail on its bottom side. CONSTITUTION:A pallet 5, 6 loaded with a workpiece is placed on a jig body 21 which moves back and forth between a conveyor 3, 4 carrying workpiece in and out. The jig body 21 conveys the pallet 5, 6 on an XY table 13 toward the conveyor 3 to conveyor 4 by a supporting plate 22 on its both sides and by a pair of guide rails 24 which is provided in parallel with the supporting plate 22 and a guide roller 23 on the inner side of the supporting plate 22, and which guides 8 plurality of roller follow 10 protruding to the bottom surface of the pallet 5, 6. The pallet 5, 6 is stopped at a specified position and held unmovable by virtue of a claw 32 on a front stopper 25 and a impinge piece 36 on a rear stopper 26, both provided on the guide rail 24. Next, the workpiece is worked on with a tool not shown on the drawing. Thus an accurate positioning is performed with a simple mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a positioning jig for a pallet on which workpieces are placed, which is used, for example, in an assembly line for automobile engine parts.

(Prior art) In engine parts assembly lines, for example, left and right
There is work to caulk and fix the bar nozzle plate inside the left camshaft housing of the camshaft 11 housing of the set. This caulking work involves transporting the left and right sets of camshafts/Usings by a conveyor, temporarily stopping the transport of the left and right sets of camshafts/Usings at a work position set up in the middle of the conveyance, and moving the riveting machine. Caulking work is performed by This libbe
When caulking on a tooling machine, a load of approximately 100 lbs is applied to the camshaft housing, so it is necessary to support the camshaft housing in a stable state. Transporting No\Using.

However, it is necessary to use a pallet positioning jig or the like in order to transport the pallet on which the camshaft/1 housing is mounted by a conveyor and to position the barre/soto at a predetermined position when the pallet is placed in a working position.

However, with conventional positioning jigs of this type, multiple sensors are placed at the work position in order to position the pallet on which the camshaft housing is placed, which has been brought into the work position from the conveyor, into a predetermined position. The pallet is detected optically or electrically, and the jig is moved in the XY direction using an actuator such as an air cylinder or solenoid.
Positioning is performed by moving in the force direction.

(Problem to be Solved by the Invention) However, as described above, it is necessary to arrange a plurality of sensors at the working position, optically or electrically detect the carried pallet, and use an actuator such as an air cylinder or solenoid to treat the pallet. Those with a structure in which the tool is moved in the XY force direction have problems such as complicated wiring and piping, making it difficult to process, causing an increase in cost, and lacking in reliability.

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a pallet positioning jig that can precisely position a carried pallet at a predetermined position without using sensors, actuators, etc. There is a particular thing.

[Structure of the invention] (Means and effects for solving the problem) This invention has the following features:
In order to achieve the above purpose, a jig body is fixed to the upper surface of a moving table installed between a workpiece loading conveyor and a workpiece unloading conveyor, and a jig body is arranged along the movement direction on both sides of this jig body. a pair of support plates; a large number of guide rollers that are rotatably provided inside these support plates and support a pallet carried in so as to be movable along the support plates;
a pair of guide rails that guide a pair of roller followers that are disposed parallel to the support plates and protrude from the lower surface of the pallet at a distance; A front stopper is provided in a biased state and stops the pallet by engaging with the tip of the pallet moving on the jig body, and a front stopper is also biased in a direction protruding upward from the other end of the guide rail. a rear stopper that allows the pallet to pass while moving on the jig body and stops the pallet by engaging the rear end of the pallet after passing; A stopper shaft is provided to be slidable in a right angle direction and biased in the forward direction by a spring, and the stopper shaft is provided with a stopper shaft that intervenes between the pair of roller followers when the pallet moves forward to lock the pallet, and the roller followers when the pallet is moved backward. a cam stopper that escapes from the gap to unlock the pallet; and a cam stopper that is fixed to the front end of the stopper shaft along the moving direction of the jig body and moves the stopper shaft forward and backward as the jig body moves. It is equipped with a cam plate.

As the moving table moves, the cam plate retreats the cam stopper to receive the pallet from the workpiece carrying conveyor, and at the same time, the tip of the pallet contacts the tip stopper and stops, and at the same time, the cam plate moves back as the moving table moves. moves the cam stopper forward and intervenes between a pair of roller followers provided on the underside of the pallet to lock the pallet. When the moving table moves again, the cam plate retreats the cam stopper to allow the pallet to be carried out, and the end stopper retreats to transfer the pallet to the workpiece carrying conveyor as the moving table moves.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

6 and 7 schematically show the construction of an assembly line for camshaft housings as engine parts for automobiles, in which 1 is an assembly position 2: where the camshaft housing is installed and a betting machine. A workpiece carry-in conveyor 3 is provided on the left side of the assembly position 2, and a workpiece carry-out conveyor 4 is provided on the right side.

The workpiece carrying conveyor 3 has a left camshaft housing a of the left and right camshaft housings a and b.
The front pallet 5 on which the camshaft housing b is placed and the rear pallet 6 on which the right camshaft housing b is placed are made into one set and are transported in sequence. As shown in FIG. The rear pallet 6 and the protruding pins 8 are in contact with each other to prevent the plates 7 from interfering with each other. A plurality of pillars 9 are protruded from the upper part of the plate 7 to support the camshaft housings a and b one by one. is provided with two protruding roller followers 10.10 spaced apart in the front-rear direction.

Then, the front pallet 5 and the rear pallet 6 are carried into the assembly position 2 by the workpiece pushing device 11 provided on the workpiece carry-in conveyor 3, and then transferred to the assembly position 2 by the workpiece carry-in conveyor 3.
The front pallet 5 and the rear pallet 6 are pulled out together from the assembly position 2 by a workpiece pull-out device 12 provided at.

Furthermore, the riveting machine 1 installed at the assembly position 2 is provided with an XY child table 3 as a movable table, and the riveting head 14 of the riveting machine 1 is opposed to the upper surface of the XY child table 3. are doing. A positioning jig 1 for positioning the front pallet 5 and the rear pallet 6 is provided on the upper part of the XY child table 3.
5 is provided.

Next, the positioning jig 15 will be explained.
It is constructed as shown in FIG.

21 is a jig main body, and on both sides of this jig main body 21 there are a pair of support plates 22.22 having the same width as the site rails 3a, 4a of the workpiece carry-in conveyor 3 and workpiece carry-out conveyor 4.
is provided. A large number of guide rollers 23 are rotatably supported inside these support plates 22.22, and support both ends of the front pallet 5 and the rear pallet 6 to support the support plates 22.22. It is designed to guide you along the way. Between the support plates 22 and 22 is the center rail 3 of the workpiece carry-in conveyor 3 and the workpiece carry-out conveyor 4.
A pair of guide rails 24.24 are provided with the same width as b and 4b. These pair of guide rails 24.24 are adapted to guide roller followers 1.0.10 which are spaced apart and protrude from the lower surfaces of the front pallet 5 and the rear pallet 6.

Further, in front of the guide rails 24, 24, there is provided a front stopper 25 that is removable from the tip of the front pallet 5, and at the rear, a rear stopper 26 that is removable from the high end of the rear pallet 6 is provided. It is provided.

To explain the front stopper 25, 27 is a slide rod supported movably along the pallet moving direction between the guide rails 24, 24, and the tip thereof is provided to protrude from one end side of the workpiece unloading conveyor 4. Stopper pin 2
8, an inclined elongated hole 29 is provided at the rear end portion thereof and penetrates in a direction perpendicular to the axial direction. Further, on both sides of the guide rail 24, there are provided pivot levers 31, 31 which are pivotably supported in the vertical direction using a pivot pin 30 as a fulcrum. A claw portion 32 that can be freely engaged with and disengaged from the front end surface of the front pallet 5 is provided at the tip end of each of the rotating levers 31. part is fixed. And hanging pin 3
3 is usually located at the lower end of the inclined elongated hole 29,
The claw portion 32 of the rotating lever 31.31 protrudes upward from the guide rail 24°24 and comes into contact with the tip of the front pallet 5 carried in to stop it. When the engagement pin 33 comes into contact and retreats, the hooking pin 33 is located at the upper end of the inclined elongated hole 29, and the claw portion 32 of the rotating lever 31.31 is recessed below the guide rail 24.24, and the front pallet 5 is The front pallet 5 is allowed to move in the transport direction by retracting from the tip.

Regarding the rear stopper 26, pivot levers 35.3 are pivotably supported on both sides of the guide rail 24.24 so as to be pivotable in the vertical direction with the pivot pin 34 as a fulcrum.
5 are provided. A contact portion 36 is provided at the tip of the rotating lever 35.35, and this
A spring 37 attached to the rear end portion urges the guide rails 24, 24 upwardly. However, when the front pallet 5 and the rear pallet 6 pass, they are pushed down against the biasing force of the spring 37, and after the rear pallet 6 passes, the contact portion 36 protrudes upward due to the biasing force of the spring 37, and It comes into contact with the rear end of the pallet 6 to prevent the pallet from moving rearward.

Further, a cutout portion 38 is provided approximately in the middle of the jig main body 21 in the front-rear direction, by cutting out a portion of the guide rail 24,24. A stopper shaft 39 is provided in this notch 38 in a direction perpendicular to the pallet transport direction. This stopper shaft 39 has bearing blocks 40 and 40 fixed at both ends to the support plates 22 and 22.
It is pivotally supported so as to be movable in the axial direction, and is urged in the forward direction (direction of arrow A) by springs 41 and 41. The distal end of the stopper shaft 39 passes through one of the support plates 22 and protrudes forward, and a roller 42 is provided on this protrusion. Further, a cam stopper 43 made of a rectangular plate having sloped surfaces on both sides is fixed to an intermediate portion of the stopper shaft 39. When the stopper shaft 39 moves forward, the cam stopper 43
is a pair of roller followers 10°1 of the rear pallet 6.
0 to lock the rear pallet 6, and when the stopper shaft 39 retreats, the roller follower 1
It is possible to escape from between 0.10 and unlock the rear pallet 6.

A cam plate 44 is installed along the moving direction of the jig body 20 at the front of the XY child table 3 to which the jig body 20 is fixed.
is fixedly provided. The cam plate 44 has convex portions 45 a and 45 b on the workpiece loading conveyor 3 side and the workpiece unloading conveyor 4 side.
A cam surface 45 having a recess 45c is formed between them, and this cam surface 45 faces the roller 42 of the stopper shaft 39. When the jig main body 20 is positioned on the workpiece loading conveyor 3 side due to the movement of the XY child table 3, the roller 42 of the stopper shaft 39 is moved to the cam plate 4.
When the jig main body 20 is located on the side of the workpiece delivery conveyor 4, the roller 42 of the stopper shaft 39 comes into contact with the protrusion 45b of the cam plate 44, and the stopper shaft 39 is moved backward. When the jig main body 20 is located at the intermediate portion, the roller 42 of the stopper shaft 39 faces the recess 45c of the cam plate 44, and the stopper shaft 39 is moved forward by the biasing force of the spring 41. . That is, when the stopper shaft 39 moves backward, the rear pallet 6 is unlocked, and when the stopper shaft 39 moves forward, the rear pallet 6 is locked.

Next, the operation of the pallet positioning jig constructed as described above will be explained. Left and right camshaft housings a and b of the pair of camshaft housings a and b
The front pallet 5 on which the camshaft housing b is placed and the rear pallet 6 on which the right camshaft housing b is placed are conveyed by the workpiece carry-in conveyor 3 in the direction of the arrow. As shown in FIG. 10, the inner surface of the right camshaft housing b is provided with protruding pins C, C, and a baffle plate d is preset in a fitted state on these protruding pins C, C. . On the other hand, XY table number 13! The receiver is moving in the direction of the workpiece carry-in conveyor 3 in preparation for loading the workpiece, and the roller 42 of the shaft 39 is suddenly in contact with the convex portion 45a1 of the cam plate 44. Therefore, the strike shaft 39 is moved backward, and the strike shaft 39 is moved back.
3 is also retracted from the guide plate 24.24. In this state, the X-red pushing device 11 operates to push out the front barre 5 and the rear barre 6 at the frontmost end of the workpiece carrying-in conveyor 3 in the direction of the work position 1. The front pallet 5 and the rear comb/socket 6 that have been pushed out are moved by the guide rollers 23 of the jig main body 20, and the roller followers 10 and 10 of the front pallet 5 and the rear comb/socket 6 are moved by the guide rails. Guided between 24°24. When the front end of the front pallet 5 and the rear comb/throat 6 that have been transferred to the jig main body 20 reaches the position of the front comb/throat 25, it comes into contact with the claw portion 32. At the same time, the rear end of the rear pallet 6 comes into contact with the contact portion of the rear stopper 26. Therefore, the front pallet 5 and the rear pallet 6 are set so as not to be movable in the longitudinal direction with respect to the jig main body 20.

When the XY child table 3 moves to the center of the work position 1, the roller 42 of the stopper shaft 39 comes off the convex part 45a of the cam plate 44 and faces the fourth part 45c.

Therefore, the stopper shaft 39 moves forward by the biasing force of the spring 41, and the cam stopper 43 intervenes between the pair of roller followers 10 and 10 of the rear pallet 6 to hold the rear pallet 6 in a locked state. That is, the right camshaft housing b placed on the rear pallet 6 is positioned at a predetermined position of the work position 1. Next, the riveting machine 2 is operated and the riveting head 14 caulks the protruding pin C of the right camshaft housing b to fix the baffle plate d to the camshaft housing b.

When all the caulking work is completed, the XY child table 3 moves in the direction of the workpiece unloading conveyor 4.

When the XY child table 3 moves in the direction of the workpiece unloading conveyor 4, the roller 42 of the stopper shaft 39 comes into contact with the convex portion 45b of the cam plate 44, the stopper shaft 39 moves backward again, and the camst buckle 43 moves toward the pair of rear pallets 6. escape from between the roller followers 10 and 10. In other words, the rear pallet 6 is brought into an unlocked state. When the XY child table 3 moves further, the slide opening and throat 27
The distal end surface contacts the stopper pin 28 and retreats.

When the slide rod 27 retreats, the engaging pin 33 is located at the inclined upper end of the inclined elongated hole 29, and the rotating lever 31.31
The claw portion 32 of is recessed below the guide rail 24°24. Therefore, the front pallet 5 and the rear pallet 6 can move on the front stopper 25, and the workpiece unloading device 12 provided on the workpiece unloading conveyor 4 moves the front pallet 5 and the rear pallet 6 located at the working position 2 into the cam. Transport it together with shaft housings a and b.

When the front pallet 5 and the rear pallet 6 are completely unloaded, the XY child table 3 moves in the direction of the workpiece loading conveyor 3 again, and the slide rod 27 of the front stopper 25 also separates from the stopper pin 28. Located at the lower end of the inclined elongated hole 29, the rotating lever 31.31
The claw portion 32 of the pallet is projected upward from the guide rail 24.24 to stop the next pallet to be carried in.

In the above embodiment, a pallet positioning jig for caulking a camshaft housing was described, but the present invention can be applied to the assembly of other engine parts, mechanical products, etc.

[Effects of the Invention] As explained above, according to the present invention, as the movable table moves, the cam plate retracts the cam stopper to receive the pallet from the workpiece carrying conveyor,
When the tip of the pallet comes into contact with the front stopper and stops, the cam plate moves the cam stopper forward as the moving table moves, intervening between a pair of cam followers provided on the underside of the pallet and locking the pallet. As a result, the pallet can be reliably locked, and when the moving table moves again, the cam plate can move the cam stopper back and unlock the pallet, without using sensors or actuators. It is possible to transport, position and fix pallets. Therefore, wiring and piping are not required, and the structure is simple and costs can be reduced.
This has the effect of improving reliability.

[Brief explanation of the drawing]

The drawings show a pallet positioning jig showing one embodiment of the present invention, and FIG. 1 is a plan view of the positioning jig, and FIG.
The figure is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a plan view of the positioning jig with a pallet placed on it, and Figure 4 is a cross-sectional view of the positioning jig in Figure 1 with a pallet placed on it. ■A sectional view along the line, Figure 5 is a front view of the positioning jig, Figure 6 is a schematic plan view of the camshaft housing assembly line, Figure 7 is a side view of the same, and Figure 8 is a plan view of the pallet. , FIG. 9 is a front view of the same, and FIG. 10 is a sectional view of the camshaft housing. 3... Workpiece carrying-in conveyor, 4... Workpiece carrying-out conveyor, 5, 6... Pallet, 10... Roller follower, 13... XY child table 21... Jig body, 2
2... Support plate, 23... Guide roller, 24...
Guide rail, 25...front stopper, 26...rear stopper, 39...stopper shaft, 43...
Stopper plate, 44... cam plate. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 1゜

Claims (1)

[Claims] A jig body fixed to the top surface of a moving table installed between a workpiece import conveyor and a workpiece discharge conveyor, a pair of support plates arranged along the movement direction on both sides of this jig body, and these support plates. A large number of guide rollers are rotatably provided inside the plate and moveably support the carried pallet along the support plate; a pair of guide rails that guide a pair of protruding roller followers;
A front stopper is provided at one end of the guide rail and is biased in an upwardly protruding direction, and the front stopper stops the pallet by engaging the tip of the pallet moving on the jig body. A rear stopper that is provided on the other end and is biased in an upwardly protruding direction to allow the passage of a pallet moving on the jig main body, and that stops the pallet by engaging the rear end of the pallet after passing. a stopper shaft provided on the jig main body so as to be slidable in a direction perpendicular to the direction of movement thereof and biased in the forward direction by a spring; and a stopper shaft provided on the stopper shaft between the pair of roller followers when the jig moves forward. a cam stopper that intervenes to lock the pallet and escapes from between the roller followers during retraction to unlock the pallet; and a cam stopper that is fixed to the front end side of the stopper shaft along the moving direction of the jig body. A pallet positioning jig comprising a cam plate that moves the stopper shaft forward and backward as the stopper shaft moves.