JPS6231240Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for fixing a pallet for transporting a workpiece at a predetermined processing position.

In pallet-type transfer machines, pallets are used to transport workpieces in a clamped state. This pallet is moved to a predetermined position by a transfer device, and the workpiece is guided to the position of the processing device and held in a clamped state.

The pallet is then fixed in position at the processing station.
Traditionally, this type of positioning and fixing device is
Each device is provided independently, and therefore each device is provided with its own drive source, making it structurally complex.

An object of the present invention is to drive the parts necessary for positioning and fixing the pallets using a single drive source, thereby simplifying the structure of the pallet fixing means.

Based on the above objectives, the present invention transmits a driving source such as an air cylinder to a plurality of arms at a predetermined arm ratio, and appropriately distributes the operating force that can be placed at each end of the arms for pallet positioning and clamping. I am trying to make it work under the .

Hereinafter, the configuration of the present invention will be specifically explained based on the embodiments shown in the drawings.

As shown in FIGS. 1 and 2, the pallet fixing device 1 of the present invention has a frame 2 as the main structural part. This frame 2 is provided for each processing station, and is provided with a drive cylinder 3 as a drive source on one side. This driving cylinder 3 is for generating driving force for positioning and fixing the pallet 4, and a pin 7 is attached to the piston rod 6 of the piston 5.
Accordingly, the drive arm 8 is swingably mounted at a predetermined arm ratio, for example approximately 1:2. One end of this drive arm 8 is connected to a sliding rod 10 by a pin 9. This sliding rod 10 has a guide portion 1 formed on the upper part of the frame 2.
1, and is supported slidably in the horizontal direction, and is connected to one clamper 13 by a pin 12 at the tip. This clamper 13
is rotatably supported by a horizontal shaft 15 with respect to a bracket 14 of the frame 2, and has an operating portion 13a corresponding to a clamp claw 16. The other end of the drive arm 8 is connected to one end of a connecting rod 18 by a pin 17. The connecting rod 18 is supported horizontally with respect to the frame 2 so as to be slidable in the axial direction, and the other end is connected to one end of the balance arm 20 by a pin 19. This balance arm 20
is the bracket 2 formed on the side of the frame 2.
1, it is swingably supported by a horizontal shaft 22, and the other end is connected to a connecting arm 24 by a pin 23 at a predetermined arm ratio. This connecting arm 24 has a long hole 2 at its upper end.
5 and pin 26 to guide part 27 of frame 2.
It is connected to a sliding rod 28 which is slidably held against the shaft. This sliding rod 28 is connected to the pin 29
It is connected to the other clamper 32 by.
Similar to the clamper 13 described above, this clamper 32 is rotatably supported on the frame 2 by a bracket 30 and a shaft 31, and its operating portion 3
2a faces the clamp claw 33. Further, the lower end portion of the interlocking arm 24 is connected to a pressing rod 35 by a pin 34. This pressing rod 35
is slidably held in the guide hole 36 of the frame 2, and its tip portion corresponds to the abutting body 37 on one side of the pallet 4.

On the other hand, the pallet 4 holds a workpiece 39 in a positioned state with a plurality of locating pins 38 on its upper surface, and the left and right brackets 40 and a shaft 41
This supports the clamp claws 16, 33 in a rotatable state. Further, the abutting body 37 is provided on one side of the pallet 4, and the abutting body 44 corresponding to the reference surface 43 of the frame 2 is provided on the opposite side. Further, on the lower surface of the pallet 4, a contact body 46 corresponding to the upward reference surface 45 of the frame 2 and a hole 62 into which the positioning pin 42 fits are provided. Further, the pallet 4 rotatably supports wheels 48 and 49 by an axle 47 at a lower position.
One wheel 48 is a grooved wheel, is slidable on the axle 47, and rides on one rail 51 while always being pushed in one direction by a spring 50. The other wheel 49 is flat and rides on the other rail 51. These rails 51 are lowered by support rods 53 and support springs 54, respectively, and are attached to the frame 2.
is supported by One end of this rail 51 is in a state where it can be connected to a fixed rail 52 at the highest position. Note that the above pallet 4 is the workpiece 39.
Appropriate temporary clamping means is provided for fixing in the positioned state, but the temporary clamping means is omitted in the drawing.

Further, the frame 2 supports a lever 56 between two rails 51 by a shaft 55 so as to be freely movable. This lever 56 has a substantially L-shape, and is connected at one end to a cylinder rod 59 of a cylinder 58 by a pin 60, and holds a pressing body 61 at the other end. This pressing body 61 is provided to move the pallet 4 horizontally along the fixed rail 55 and the rail 51. Note that a reference surface 57 is integrally formed on the frame 2 in order to regulate the amount of movement of the pallet 4 at this time.

Next, the operation of the pallet fixing device 1 will be explained.

The pallet 4 branches off from the transfer line and is guided onto two fixed rails 55 with the workpiece 39 fixed thereon. At this point, the cylinder 58 advances its cylinder rod 59 and rotates the lever 56 from the standby position shown in phantom lines in FIG. 2 to the push-in position shown in solid lines, that is, clockwise. At this time, the pressing body 61 engages with the rear end portion of the pallet 4, moves the pallet 4 along the fixed rail 52 and the rail 51 in the direction of arrow A, and brings the pallet 4 into contact with the reference surface 57.
In this state, the workpiece 39 is positioned in the longitudinal direction of the rail 51.

Thereafter, the drive cylinder 3 causes the piston rod 6 in the extended state to retreat in the direction of arrow A, and draws the drive arm 8 toward the frame 2. At this time, both the sliding rod 10 and the connecting rod 18 move to the right in FIG.
When the balance arm 20 lightly contacts the clamp claw 16, the interlocking rod 18 further moves to the right in FIG. 1 due to the arm ratio of the drive arm 8. Rotate clockwise. As a result, interlocking arm 2
4 approaches the frame 2 and moves the pressing rod 35 and the sliding rod 28 to the left. The pressing rod 35 and the sliding rod 28 move together in the initial play state, but when the clamper 32 lightly touches the clamp claw 33, the sliding rod 28 no longer moves due to the arm ratio of the interlocking arm 24. , instead of the pressing rod 35, the abutting body 3
7, move the pallet 4 to the left in FIG.
press against. When the pallet 4 is moved by the pressing rod 35, one wheel 49 slides on one of the rails 51, but the other wheel 48 remains stuck in the rail 51 at the groove part and the spring 50 It moves in the axial direction of the support shaft 47 against the elasticity and allows the pallet 4 to move. In this way, the pallet 4 is positioned in a direction perpendicular to the rail 51.

When this positioning is completed, the force of the piston rod 6 no longer moves the pressure rod 35;
It also serves for the movement of the sliding rods 10,28. For this reason, the clampers 13, 32 push the clamp claws 16, 33 of the pallet 4 downward with their action parts 13a, 32a, and press the clamp claws 16, 33 against the workpiece 39. In this way, the clamp claws 16, 33 fix the temporarily clamped workpiece 39 onto the pallet 4 with even stronger force.

When the pallet 4 is on the rail 51, the support spring 54 pushes it up, so that the abutting body 46 on the lower surface of the pallet 4 is slightly above the reference plane 45 of the frame 2. However, when the clampers 13 and 32 press the clamp claws 16 and 33 downward, the pallet 4 sinks under the force and presses the contact body 46 on the lower surface against the reference surface 45. In this way, the pallet 4 is positioned in the vertical direction.

In this way, the pallet 4 is three-dimensionally positioned at a predetermined processing position. In this state, the workpiece 39 is subjected to necessary machining.

When this machining is completed, drive cylinder 3
In order to move the piston rod 6 in the direction of arrow B, the pallet 4 and the workpiece 39 are moved by the clampers 13, 32 and the clamp claws 16, 33.
The fixed rail 51 is released from the fixation by the floating rail 51 and can be moved from the floating rail 51 to the fixed rail 55.

In the above embodiment, the workpiece 39 is clamped by the clampers 13 and 32 via the clamp claws 16 and
Although the clampers 13 and 32 may be of a type that directly clamps the workpiece 39 and the pallet 4, it is also possible.

In this invention, the drive source for positioning and fixing the pallets is one and commonly used, so multiple drive cylinders etc. are not required.
Moreover, the synchronization of positioning and fixing operations is reliable, and position detection means such as limit switches for synchronization can be omitted.Also, the arm ratio of the drive arm and interlocking arm determines the order in which the forces are applied, making it easy to position the pallet. and fixing operations are performed in order.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the pallet fixing device of the present invention seen from the front, and FIG. 2 is a vertical sectional view of the same device seen from the side. 1... Pallet fixing device, 2... Frame, 3
... Drive cylinder as a drive source, 4... Pallet, 8... Drive arm, 13... One clamper, 18... Connection rod, 20... Balance arm, 24... Interlocking arm, 32... Other... Clamper, 35...pressing rod, 39...work.

Claims (1)

[Scope of utility model registration request] A drive arm is swingably provided in the drive source at a predetermined arm ratio, one end of this drive arm is connected to one clamper for fixing the pallet, and the other end of the drive arm is attached to a swingable balance. An interlocking arm is connected to one end of the arm, and an interlocking arm is provided at the other end of the balance arm so as to be swingable at a predetermined arm ratio, one end of the interlocking arm is connected to the other clamper for fixing the pallet, and A pallet fixing device characterized in that the other end of the interlocking arm is connected to a pressing rod for positioning the pallet.