JP2526165B2 - Pallet positioning jig - Google Patents

Description

Description: [Object of the Invention] (Industrial field of application) The present invention relates to a positioning jig for a pallet used in an assembly line of, for example, engine parts of automobiles and on which a work is placed.

(Prior Art) In an assembly line of engine parts, for example, there is a work of caulking and fixing a baffle plate inside a left camshaft housing of a pair of left and right camshaft housings. In this caulking work, one set of left and right camshaft housings is conveyed by a conveyor, the conveyance of one set of left and right camshaft housings is temporarily stopped at the work position provided during the conveyance, and caulking work is performed by a riveting machine. There is. When caulking in this riveting machine, a load of nearly 1t is applied to the camshaft housing, so it is necessary to support the camshaft housing in a stable state.Place the camshaft housing on the pallet and transport the camshaft housing together with the pallet. There is.

However, it is necessary to use a pallet positioning jig or the like to convey the pallet on which the camshaft housing is placed by the conveyor and to position the pallet at a predetermined position when the pallet is located at the working position.

However, conventional positioning jigs of this type were loaded with a plurality of sensors arranged in the working position in order to position the pallet carrying the camshaft housing loaded from the conveyor into the working position at a predetermined position. Detect the pallet optically or electrically and use an actuator such as an air cylinder or solenoid to move the jig to XY
It moves in the direction and is positioned.

(Problems to be Solved by the Invention) However, as described above, a plurality of sensors are arranged at the work position, the loaded pallet is optically or electrically detected, and an actuator such as an air cylinder or a solenoid is used to cure the pallet. The structure in which the tool is moved in the XY directions has complicated wiring and piping, which makes it difficult to process the tool, which causes a cost increase and lacks reliability.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a pallet positioning jig capable of accurately positioning a loaded pallet at a predetermined position without using a sensor, an actuator or the like. Especially.

[Structure of the Invention] (Means and Actions for Solving the Problem) In order to achieve the above-mentioned object, the present invention is a jig fixed to the upper surface of a moving table installed between a work carry-in conveyor and a work carry-out conveyor. The tool main body, a pair of support plates arranged on both sides of the jig main body along the movement direction, and the pallet rotatably provided inside the support plates and moved in along the support plates. A plurality of guide rollers that are supported in parallel with each other, a pair of guide rails that are disposed between the support plates in parallel with each other and that guide a pair of roller followers that are spaced apart from and project from the lower surface of the pallet, and the guide rails. A front stopper that stops the pallet by hooking it to the tip of the pallet that moves on the jig body and is urged upward in one end, and the other end of the guide rail as well. A rear stopper which is provided in a state of being urged in a direction projecting upward to allow passage of a pallet moving on the jig main body, and which is engaged with the rear end of the pallet to stop the pallet after the passage, A stopper shaft slidably provided in the jig main body in a direction perpendicular to its moving direction and urged in the forward direction by a spring, and an intervening space between the pair of roller followers provided in the stopper shaft during forward movement. A cam stopper that locks the pallet and unlocks the pallet by ejecting from between the roller followers when retreating, and fixed along the moving direction of the jig body and on the front end side of the stopper shaft to move the jig body. Accordingly, a cam plate for advancing and retracting the stopper shaft is provided.

As the moving table moves, the cam plate retracts the cam stopper to accept the pallet loading from the work loading conveyor, and the tip of the pallet comes into contact with the leading end stopper to stop, and at the same time, the cam plate moves to the cam stopper as the moving table moves. Is advanced to intervene between a pair of roller followers provided on the lower surface of the pallet to lock the pallet. When the moving table moves again, the cam plate retracts the cam stopper to allow the pallet to be carried out, and the tip stopper retracts to transfer the pallet to the work unloading conveyor as the moving table moves.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

6 and 7 show a schematic structure of an assembly line of a camshaft housing as an automobile engine part, in which 1 is a riveting machine installed in an assembly position 2. A work carry-in conveyor 3 is provided on the left side of the assembly position 2, and a work carry-out conveyor 4 is provided on the right side. Of the set of left and right camshaft housings a and b, the work carry-in conveyor 3 includes a front pallet 5 on which the left camshaft housing a is mounted and a rear pallet 6 on which the right camshaft housing b is mounted. Are sequentially conveyed. As shown in FIGS. 8 and 9, the front pallet 5 and the rear pallet 6 are provided with projecting pins 8 on the front and rear end faces of both ends of the rectangular plate 7 to project the front pallet 5 and the rear pallet 5. The rear pallets 6 are designed so that the projecting pins 8 ... Contact each other and the plates 7 do not interfere with each other. A plurality of columns 9 are projected on the upper part of the plate 7 to support the camshaft housings a and b one by one. Further, the lower surface of the plate 7 located in the middle of the plate 7 in the longitudinal direction. Two roller followers 10, 10 spaced apart in the front-rear direction are provided so as to project.

Then, the front pallet 5 and the rear pallet 6 are carried into the assembly position 2 by the work pushing device 11 provided in the work carry-in conveyor 3, and the work carry-out conveyor 4
It is configured to pull out the front pallet 5 and the rear pallet 6 together from the assembly position 2 by the work pulling-out device 12 provided at.

Further, the riveting machine 1 installed at the assembly position 2 is provided with an XY table 13 as a moving table, and the riveting head 14 of the riveting machine 1 faces the upper surface of the XY table 13. A positioning jig 15 for positioning the front pallet 5 and the rear pallet 6 is provided above the XY table 13.

Next, the positioning jig 15 will be described with reference to FIG.
It is constructed as shown in FIG. Reference numeral 21 denotes a jig main body, and a pair of support plates 22, 22 having the same width as the side rails 3a, 4a of the work carry-in conveyor 3 and the work carry-out conveyor 4 are provided on both sides of the jig main body 21. A large number of guide rollers 23 are rotatably supported inside the support plates 22 and 22, and support both ends of the front pallet 5 and the rear pallet 6 along the support plates 22 and 22. To guide you. Between the support plates 22 and 22, a pair of guide rails 24 and 24 are provided in the same width as the center rails 3b and 4b of the work carry-in conveyor 3 and the work carry-out conveyor 4. The pair of guide rails 24, 24 guide the roller followers 10, 10 which are provided on the lower surfaces of the front pallet 5 and the rear pallet 6 so as to be spaced apart from each other. Further, in front of the guide rails 24, 24, there is provided a front stopper 25 that can be engaged with and disengaged from the front end of the front pallet 5, and on the rear side there is a rear stopper 26 that can be engaged with and disengaged from the high end of the rear pallet 6. It is provided.

Explaining the front stopper 25, 27 is a slide rod movably supported between the guide rails 24, 24 along the pallet moving direction, and the tip end thereof is provided on one end side of the work unloading conveyor 4 so as to project therefrom. An inclined elongated hole 29 is provided in the rear end portion, which faces the stopper pin 28 and penetrates in a direction orthogonal to the axial direction. Further, on both sides of the guide rails 24, 24, there are provided pivoting levers 31, 31 pivotally supported about a pivot pin 30 so as to be pivotable in the vertical direction. A claw portion 32 is provided at the tip of these rotating levers 31 and 31 so as to be engageable with and disengageable from the tip surface of the front pallet 5, and at the rear end thereof, both ends of the engaging pin 33 inserted into the inclined elongated hole 29. The part is fixed. The engaging pin 33 is usually located at the lower end of the tilt of the tilted long hole 29, and the claw portions 32 of the turning levers 31, 31 project above the guide rails 24, 24 so that the front pallet 5 is carried in. It is designed to come into contact with the tip end portion and stop, but when the slide rod 27 comes into contact with the stopper pin 28 and retracts, the engaging pin 33 is positioned at the upper end of the inclined long hole 29, and the rotary lever Insert the claw 32 of 31,31 into the guide rail 24,24
The front pallet 5 is retracted further downward and retracted from the front end of the front pallet 5 to allow the front pallet 5 to move in the transport direction.

Further, the rear stopper 26 will be described. On both sides of the guide rails 24, 24, there are provided pivoting levers 35, 35 pivotally supported so as to be pivotable in the vertical direction with a pivot pin 34 as a fulcrum. An abutting portion 36 is provided at the tip end portion of the rotating levers 35, 35, and this is a direction in which the contact portion 36 is projected above the guide rails 24, 24 by a spring 37 attached to the rear end portion of the rotating levers 35, 35. Is urged by. However, when the front pallet 5 and the rear pallet 6 pass, they are pushed down against the urging force of the spring 37, and the rear pallet 6
After passing, the contact part 36
Project upward and come into contact with the rear end of the rear pallet 6 to prevent the pallet from moving rearward.

Further, a notch 38 is formed in the jig main body 21 at a substantially middle portion in the front-rear direction by cutting out a part of the guide rails 24, 24. A stopper shaft 39 is provided in the cutout portion 38 in a direction orthogonal to the pallet conveying direction. Both ends of this stopper shaft 39 are the support plates 22, 2
The bearing blocks 40, 40 fixed to 2 are axially supported so as to be movable in the axial direction, and are urged by the springs 41, 41 in the forward direction (arrow A direction). The tip end of the stopper shaft 39 penetrates one of the support plates 22 and projects forward, and a roller 42 is provided on this projection. A cam stopper 43, which is a rectangular plate having inclined surfaces on both sides, is fixed to the intermediate portion of the stopper shaft 39. When the stopper shaft 39 moves forward, the cam stopper 43 intervenes between the pair of roller followers 10, 10 of the rear pallet 6 to lock the rear pallet 6, and when the stopper shaft 39 moves backward, the cam follower 43 moves between the roller followers 10, 10. The rear pallet 6 can be unlocked by escaping.

At the front of the XY table 13 to which the jig body 20 is fixed, a cam plate 44 is fixedly provided along the moving direction of the jig body 20. The cam plate 44 has projections 45a, 45 on the work-carry-in side conveyor 3 side and the work-carry-out conveyor 4 side.
b, a cam surface 45 having a concave portion 45c is formed between the convex portions 45a, 45b, and the cam surface 45 faces the roller 42 of the stopper shaft 39. Then, when the jig body 20 is located on the workpiece carry-in conveyor 3 side by the movement of the XY table 13, the roller 42 of the stopper shaft 39 is moved by the cam plate 44.
Of the stopper shaft 39 when the jig body 20 is located on the workpiece unloading conveyor 4 side, the roller 42 of the stopper shaft 39 contacts the protrusion 45b of the cam plate 44.
When the jig body 20 is located in the middle part, the roller 42 of the stopper shaft 39 faces the concave portion 45c of the cam plate 44, and the stopper shaft 39 moves backward.
Is moved forward by the urging force of the spring 41. That is, the rear pallet 6 is unlocked when the stopper shaft 39 moves backward, and the rear pallet 6 is locked when the stopper shaft 39 moves forward.

Next, the operation of the pallet positioning jig configured as described above will be described. Of the pair of left and right camshaft housings a and b, the left camshaft housing a
The front pallet 5 on which is mounted and the rear pallet 6 on which the right camshaft housing b is mounted are conveyed by the work carry-in conveyor 3 in the arrow direction. Then, as shown in FIG. 10, on the inner surface of the right camshaft housing b,
Projecting pins c, c are provided, and a baffle plate d is set in advance in a fitted state on the projecting pins c, c.
On the other hand, the XY table 13 is moving toward the work carrying-in conveyor 3 in preparation for receiving the work, and the roller 42 of the stopper shaft 39 is in contact with the convex portion 45a of the cam plate 44. Therefore, the stopper shaft 39 retracts,
The cam stopper 43 is also retracted from the guide plates 24, 24. In this state, the pallet pushing device 11 operates to push the front pallet 5 and the rear pallet 6 at the front end of the work carrying-in conveyor 3 toward the working position 1. The extruded front pallet 5 and rear pallet 6 are moved by the guide rollers 23 of the jig body 20, and the roller followers 10, 10 of the front pallet 5 and rear pallet 6 are guided between the guide rails 24, 24. It Of the front pallet 5 and the rear pallet 6 transferred to the jig body 20, when the front end of the front pallet 5 reaches the position of the front stopper 25, it comes into contact with the pawl portion 32 and stops, and The rear end portion of the pallet 6 contacts the contact portion of the rear stopper 26. Therefore, the front pallet 5 and the rear pallet 6 are set immovable in the front-rear direction with respect to the jig body 20.

When the XY table 13 moves to the center of the work position 1, the roller 42 of the stopper shaft 39 comes off the convex portion 45a of the cam plate 44 and faces the concave portion 45c. Therefore, the stopper shaft 39 is advanced by the urging force of the spring 41, the cam stopper 43 intervenes between the pair of roller followers 10 and 10 of the rear pallet 6, and holds the rear pallet 6 in the locked state. That is, the right camshaft housing b placed on the rear pallet 6 is positioned at a predetermined position of the working position 1. Next, the riveting machine 2 is operated to caulk the protruding pin c of the right camshaft housing b by the riveting head 14 to fix the baffle plate d to the camshaft housing b.

When all the caulking work is completed, the XY table 13 moves toward the work unloading conveyor 4. When the XY table 13 moves toward the work unloading conveyor 4 direction, the stopper shaft
The roller 42 of 39 contacts the convex portion 45b of the cam plate 44, the stopper shaft 39 retracts again, and the cam stopper 43 escapes from between the pair of roller followers 10 and 10 of the rear pallet 6. That is, the rear pallet 6 is unlocked. When the XY table 13 moves further, the slide rod
The tip end surface of 27 comes into contact with the stopper pin 28 and retracts. When the slide rod 27 retracts, the engaging pin 33 is located at the upper end of the inclination of the inclined long hole 29, and the claw portion 32 of the rotating lever 31, 31 is retracted below the guide rails 24, 24. Therefore, the front pallet 5 and the rear pallet 6 can be moved on the front stopper 25, and the front pallet 5 and the rear pallet 6 located at the work position 2 are cammed by the work pulling device 12 provided on the work unloading conveyor 4. It is carried out together with the shaft housings a and b.

When the unloading of the front pallet 5 and the rear pallet 6 is completed, the XY table 13 moves again toward the workpiece carry-in conveyor 3 and the slide rod 27 of the front stopper 25 also separates from the stopper pin 28, so that the engaging pin 33 tilts. Located at the lower end of the slant of the long hole 29, the claw portions 32 of the rotating levers 31, 31 are projected above the guide rails 24, 24 to stop the pallet to be carried in next.

Although the pallet positioning jig for caulking the camshaft housing has been described in the above-described embodiment, the invention can be applied to assembly of other engine parts, assembly of machine products, and the like.

[Effects of the Invention] As described above, according to the present invention, the cam plate retracts the cam stopper in accordance with the movement of the moving table to receive the loading of the pallet from the work loading conveyor, and the leading end of the pallet is the front stopper. When the moving table moves, the cam plate advances the cam stopper and at the same time intervenes between the pair of cam followers provided on the lower surface of the pallet to lock the pallet. When the moving table moves again, the cam plate can retract the cam stopper to unlock the pallet, and the pallet can be mechanically transported, positioned, and moved without using sensors or actuators. Can be fixed. Therefore, wiring and piping are unnecessary,
It is structurally simple, and the cost can be reduced, and the reliability can be improved.

[Brief description of drawings]

The drawings show a positioning jig for a pallet showing an embodiment of the present invention. FIG. 1 is a plan view of the positioning jig, and FIG.
1 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a plan view of a positioning jig on which a pallet is placed, and FIG. 4 is a II-II of FIG. 1 of a positioning jig on which a pallet is placed. A sectional view taken along line II, FIG. 5 is a front view of a positioning jig, FIG. 6 is a schematic plan view of an assembly line of a camshaft housing, FIG. 7 is a side view of the same, and FIG. 8 is a plan view of a pallet. 9 is a front view of the same, and FIG. 10 is a sectional view of a camshaft housing. 3 ... Work carry-in conveyor, 4 ... Work carry-out conveyor, 5,6 ... Pallet, 10 ... Roller follower, 13 ... X
Y table, 21 ... Jig body, 22 ... Support plate, 23 ... Guide roller, 24 ... Guide rail, 25 ... Front stopper, 26 ... Rear stopper, 39 ... Stopper shaft, 43
...... Stopper plate, 44 …… Cam plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor St. Fukushima 5-3-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Yuichi Hazaki 1 Nakasiri, Hashime-cho, Okazaki-shi, Aichi Address Sanritsu Automobile Engineering Co., Ltd. Okazaki Plant (56) Reference Japanese Unexamined Patent Publication No. 2-265812 (JP, A) Seki 61-108230 (JP, U) JP 59-4324 (JP, B2)

Claims (1)

(57) [Claims] 1. A jig main body fixed to an upper surface of a moving table installed between a work carry-in conveyor and a work carry-out conveyor, and a pair of supports arranged on both sides of the jig main body along a moving direction. Plates, a plurality of guide rollers rotatably provided inside the support plates and movably supporting the pallets carried in along the support plates, and the pallets arranged between the support plates in parallel with the guide rollers. A pair of guide rails that guide a pair of roller followers that are spaced from the lower surface of the guide rail, and move on the jig body while being biased toward one end of the guide rails in a direction that projects upward. The front stopper that locks the pallet by stopping it against the tip of the pallet and the pallet that moves on the jig body while being urged to the other end of the guide rail in the direction to project upward Communication And a rear stopper that locks the pallet at the rear end after passing and stops the pallet, and a jig provided in the jig body slidably in a direction perpendicular to the moving direction and attached in the forward direction by a spring. A biased stopper shaft, and a cam stopper which is provided on the stopper shaft and locks the pallet by intervening between the pair of roller followers at the time of forward movement, and escapes from between the roller followers at the time of backward movement to unlock the pallet,
A pallet comprising: a cam plate which is fixed to the front end side of the stopper shaft along the moving direction of the jig body, and which moves the stopper shaft forward and backward as the jig body moves. Positioning jig.