JPS5817097B2 - Pallet stopping and starting device in chain type pallet transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a device that positions the pallets so that work units are arranged at work stations on the work line, and each work unit processes workpieces on the pallets by circulating the pallets. The present invention relates to a chain-type pallet transfer device, in particular, to a device that stops a pallet at each work station and smoothly starts the pallet after finishing a processing operation.

For example, there is a transfer device as shown in FIG. 1, in which work units A, A, A, . . . are arranged at each work station.

The work station is equipped with a device for stopping the pallet C being placed on the transfer chain B.

Some of these stopping devices simply stop the transfer of pallets on the transfer chain with a simple stopper.
When kneading, the pallet suddenly stops, causing the workpieces on the pallet to shift or fall, and there is also impact noise from collisions.
Furthermore, there are other problems such as the pallet starting to be unstable after it has stopped.

The present invention was devised in view of these problems, and will be explained below with reference to FIGS. 2 to 8.

FIG. 2 is a plan view showing the main parts of the present invention, and B is a transfer chain that transfers the pallet C to each work station.

1 is a base plate placed on the work line, and on the top surface of this base plate 1 is a pair of brake plates 2.
One end of the brake shaft 3 is rotatably mounted around the brake shaft 3.

The pair of brake plates 2 are biased toward each other in the direction of the center line of the transfer device by a brake pressing rod 4 such that their tips taper toward each other in the direction of transfer of the pallet C. The brake suppression rod 4 is provided in a guide block 5 fixed to the base plate 1 so as to be able to slide back and forth.

The brake pressing rod 4 is always biased so that its tip protrudes by a brake suppressing spring 6 built into the guide block 5, and this pressing force can be adjusted freely by an adjusting screw 7 screwed into the guide block 5. .

These brake pressing rod 4, guide block 5, and brake pressing spring 6 constitute a braking force applying means.

Further, as shown in FIG. 3, a rotation regulating pin 8 is embedded in the brake plate 2, and the tip of this rotation regulating pin 8 is loosely inserted into a guide groove 9 provided in the base plate 1. The range of rotation to the center is limited.

Furthermore, in FIGS. 2 and 4, an air cylinder D is fixed to the lower surface of the base plate 1, and a connecting pin 11 is attached to the tip of the piston rod 10 of the air cylinder D.
One end of the arm 12 is connected via.

This arm 12 is rotatable about a support shaft 13, and one end of a slide block 14 is connected to the other end of the arm 12 by a support bolt 33.

The slide block 14 is guided in a reciprocating manner by a slide block guide 15 fixed to the lower surface of the base plate 1, and a feed claw 16 for feeding out the pallet C is attached to the slide block 14 by a block 17.
is fixed, and can freely reciprocate within a moving hole 18 cut in the direction of the center line of the base plate 1.

A lever press rod 19 is inserted into the other end of the slide block 14 so as to be able to slide back and forth, and the lever press rod 19 is moved to the right by a slide spring 20 built into the slide block 14 so that its tip protrudes. It is constantly elastically biased.

One end of a lever 22 that is not rotatable on the vertical surface of the base plate 1 is brought into contact with the tip of the lever pressing rod 19, and a lever regulating pin 23 implanted in this lever 22 slides. It is engaged in a notch groove 24 cut out in the block 14.

An elongated hole 25 is bored at the other end of the lever 22, and a guide pin 28 is implanted into the elongated hole 25 at the lower end of a stopper shaft 27 that can be moved up and down within a stopper shaft side bearing 26 fixed to the base plate 1. is not inserted freely and freely.

This stopper shaft 27 is configured to move up and down by rotating the lever 22.

A stopper block 29 is fixed to the upper part of the stopper shaft 27, and the pallet C is aligned with the center line of the transfer device.
The pallet block 30 fixed on the center line of the lower surface of the pallet block 30 is latched thereto.

The feed claw 16 is mounted on the block 17 and is rotatable around the pin 31. The feed pawl 16 is constantly biased in a direction opposite to the pallet transport direction (counterclockwise in FIG. 4) by a torsion coil spring 32 whose other end is in contact with the slide block 14, respectively.

With the above configuration, the pallet C on which the workpiece (not shown) is placed is placed on the transfer chain B and transferred, and when it reaches the work station, the pallet C is moved by the pallet block 30. As shown in Figure 5, feed claw 1
6 in a clockwise direction, it fits between the pair of brake plates 2, and moves forward to the right while receiving the braking force.

At this time, the brake plate 2 gradually retracts the brake pressing rod 4 into the guide block 5 while compressing the brake pressing spring 6.

As shown in FIG. 6, the pallet block 30 comes into contact with the stopper block 29 of the stopper shaft 27 while decelerating under the braking force, and when the pallet C stops, the pallet C is moved to a positioning device (not shown). It is then positioned and fixed.

Thereafter, the workpiece (not shown) is processed by the work unit A of the work station.

When this is completed, the air cylinder D shown in FIG. 2 is operated and the piston rod 10 moves forward to the left, so the arm 12 rotates counterclockwise and the slide block 14 moves to the right as shown in FIG. move forward towards

Therefore, the lever 22 is pressed by the lever pressing rod 19 and rotates clockwise about the lever pin 21, and the stopper shaft 27 is lowered.

When the stopper shaft 27 descends and the stopper block 29 comes into contact with the stopper shaft circumferential bearing 26, the stopper shaft 27 does not descend any further, but the feed pawl 16 returns to its original position due to the torsion coil spring 32 after the pallet C has passed. Therefore, as the slide block 14 moves forward to the right, it moves further forward while compressing the slide spring 20 as shown in FIG. 8, and the pallet C is delivered to the next work station.

When the feeding of the pallet C is completed, a signal is input to the air cylinder D, and the piston rod 10 retreats to the right, so the slide block 14 also retreats to the left, and the stopper shaft 27 rises above the base plate again.

Then, the feed claw 16 also retreats to its original position.

As explained above, the present invention applies a braking force to the pallet C placed on the transfer chain B to be transferred to gradually decelerate and smoothly stop the pallet C, and uses a forced force to start the pallet C after the work is completed. Because of the feed-out configuration, there is no impact or noise when the pallet stops at each work station, reducing pallet positioning time, and also prevents workpieces on the pallet from shifting from the holding position on the pallet or falling over. This has the effect of reducing pallet transport time.

Furthermore, the pallet can be reliably started after the work by the work unit at the work station has finished, and the transfer speed can be quickly returned to.Furthermore, since the reciprocating power source for stopping and starting is a single air cylinder, the equipment is This has extremely significant effects such as being able to provide a compact and inexpensive transfer device.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a transfer device in which a work unit is arranged, Fig. 2 is a plan view including a partial cross section showing the pallet stopping and starting device of the present invention, and Fig. 3 shows the state in which the brake plate is installed. Figure 2 is an enlarged sectional view taken along line N-I, Figure 4 is the
5 and 6 are sectional views showing the pallet stopping operation, and FIGS. 7 and 8 are sectional views showing the pallet starting operation. A is the work unit, B is the transfer chain, C is the pallet,
D is an air cylinder, 1 is a base plate, 2 is a brake plate, 3 is a brake shaft, 4 is a brake pressing rod, 5 is a guide block, 6 is a brake suppression spring,
7 is an adjustment screw, 8 is a rotation regulating pin, 9 is a guide groove, 10
is a piston rod, 11 is a connecting pin, 12 is an arm, 1
3 is a support shaft, 14 is a slide block, 15 is a slide block guide, 16 is a feed pawl, 17 is a feed pawl mounting block, 18 is a moving hole, 19 is a lever pressing rod, 20 is a slide spring, 21 is a lever pin, 22 2 is a lever, 23 is a lever regulation pin, 24 is a notched groove, 25 is an elongated hole, 26 is a stopper shaft circumferential bearing, 27 is a stopper shaft, 2
8 is a guide pin, 29 is a stopper block, 30 is a pallet block, 31 is a mounting pin, 32 is a torsion coil spring, and 33 is a support bolt.

Claims (1)

[Claims] 1. A work unit A is located at a work station on a work line.
In a chain-type pallet transfer device equipped with a device for circulating a pallet C with a pallet block 30 fixed to the bottom surface and positioning the pallet C so that each work unit A processes a workpiece on the pallet C, A pair of brake plates are mounted on the upper surface of the base plate 1 disposed on the work line, and are rotatable around a brake shaft 3 and biased by a braking force applying means so that their tips approach each other along the direction of conveyance of the pallet C. A slide block guide 15 is fixed to the lower surface of the base plate 1 to reciprocally guide a slide block 14 moved by a reciprocating power source, and the slide block 14 is elastically biased so that its tip protrudes. A lever pressing rod 19 is inserted, one end of an L-shaped lever 22 that can freely rotate on the vertical surface of the base plate 1 is brought into contact with the tip of this lever pressing rod 19, and the other end of this lever 22 is inserted through the base plate 1. It is characterized in that it can be raised and lowered freely, and a stopper shaft 27 that can lock the pallet block 30 is connected when it is raised, and that the slide block 14 is further provided with a feed pawl 16 that feeds out the pallet C when the stopper shaft 27 is lowered. Pallet stopping and starting device. 2. The feed pawl is fixed to the slide block 14. The feed pawl is mounted on the block 17 and is rotatable around the pin 31 as a fulcrum. The pallet stopping and starting device according to claim 1, characterized in that the pallet C is constantly biased in a direction opposite to the transport direction of the pallet C by torsion coil springs 32 whose ends abut against the slide blocks 14, respectively. . 3 The brake plate consists of a guide groove 9 provided on the base plate 1 and a rotation regulating pin 8 planted on the brake plate 2.
The pallet stopping and starting device according to claim 1 or 2, wherein the rotation range is limited by. 4. The braking force applying means is composed of a brake pressing rod 4 that can freely reciprocate within the guide block 5 and a brake suppressing spring 6 that constantly biases the tip of the tongue brake pressing rod 4 built into the guide block 5 to protrude. A pallet stopping and starting device according to claim 1, 2 or 3, characterized in that: