JPS6233169B2 - - Google Patents

Description

[Detailed Description of the Invention] When trying to temporarily stop conveyed objects without impact on a conveyor that can accumulate, conventionally, the impact point on either the stopping device or the pallet (work) side is made of an elastic body. Either the elastic body should absorb the impact and stop by elastic deformation, or a stopping device or pallet (workpiece) should be used.
A damper with a restoring force is installed on either side to absorb the impact and stop the vehicle, but as in the former case, the impact point is made of an elastic body and the elastic deformation is Therefore, means for absorbing shock can perform its function when the kinetic energy of the conveyed object is small, that is, when the conveyance speed is slow or the weight of the conveyed object is light. However, in order to convert deformation energy into deformation energy, the usable range is extremely limited in terms of devices that can be used in actual equipment. On the other hand, the latter method, which uses a damper, absorbs shock to a considerable extent compared to the former method, and has a wide range of uses. Due to the use of springs, etc., the conveyed object is pushed back once it has stopped. As a result, depending on the working conditions, there is a defect that causes an error in the stopping position even though it must be accurately stopped and fixed at a certain position. If you try to overcome the restoring force of the spring and stop it in a fixed position, you will have to wastefully increase the driving force more than necessary.

Furthermore, even if the conveyed object is flowing at an extremely slow speed compared to the predetermined speed for some reason, it is of course necessary to stop the conveyed object at a fixed position for work purposes. However, if the conveyance speed is slow, there is a risk that the conveyor will not be able to get over the reverse prevention claw at the stop position and will stop before the original stop position.

In addition, in conventional conveyors that can accumulate, there is a delay in starting when restarting after a temporary stop. Although this delay time is extremely short, it cannot be ignored if it accumulates in terms of high productivity in continuous flow operations. Conventionally, some machines have been equipped with a fast-forwarding device to eliminate the delay in start-up when restarting, but this type of fast-forwarding device was itself a stand-alone device.

This invention has been improved in view of the above-mentioned deficiencies in the conveyor that can accumulate, and even if the conveyance speed is increased, it stops accurately at a fixed position without impact, and also prevents the conveyed object from starting when restarting. The purpose of this invention is to obtain a simple and highly productive stopping device that eliminates delays and also has a rapid forwarding function.

The illustrated embodiment will be described below. Reference numeral 1 denotes a pallet on which objects to be transported, such as parts for assembly, are placed.
2 is a free flow chain, for example chain a
A conveying roller b is arranged to place the pallet 1 on the pallet 1, and when the pallet 1 is conveyed as the chain a advances, and when the pallet 1 is stopped by the stopper, the friction between the pallet 1 and the pallet 1 is reduced due to the idle rotation of the roller b. This type is constructed to reduce resistance and advance chain a, thereby eliminating wasted power required to drive the chain. Reference numerals 3 and 4 denote first and second cylinders installed in parallel below the pallet 1 at the stop position of the pallet 1, and an operating piece 9 is connected to each pin 10 on the upper part of the rods 7 and 8 of the respective pistons 5 and 6. ,11
It is rotatably mounted. This actuating piece 9 has one rod, for example 7, stopped and the other rod 8
The pins 10 and 11 are
One of the two rods is loosely fitted into the elongated hole 12, and is held so that it can rotate by a certain angle as one of the rods moves up and down. Reference numeral 13 denotes a roller-shaped stopper that is provided at the front of the pallet 1 in the advancing direction and protrudes from the front end of the actuating piece 9. Reference numeral 14 designates a reverse movement preventing pawl protruding from the opposite side of the actuating piece 9, that is, from the rear end, and is adapted to engage with a stepped portion 15 formed on the pallet 1.

As shown in FIG. 1, when the pallet 1 is advanced toward the stop position by the free flow chain 2, compressed air, such as compressed air, is supplied through the ball 16 to the lower chamber of the piston 5 of the first cylinder 3 at the front. Since fluid is supplied, the piston rod 7 rises, the stopper 13 of the actuating piece 9 advances into the passage of the pallet 1, and the other end of the actuating piece 9 is lowered. Therefore, pallet 1 is sent as chain 2 progresses.
hits the stopper 13, and the piston rod 8 of the other second cylinder 4 moves counterclockwise around the pin 10.
As it rotates while pulling up the piston 6
acts as a dart pot, and the air above the second cylinder 4 is compressed and absorbs energy, and at the same time escapes to the atmosphere from the port 17 through the throttle valve 18. At the same time, compressed air is supplied from the lower port 19 to the piston rod 8. Since the pallet 1 stops at its upper limit, the pallet 1 is fixed at an accurate stopping position by the stopper 13 and the anti-backward pawl 14 that engages with the stepped portion 15, as shown in FIG.

Next, when compressed air is supplied from the upper port 20 of the first cylinder 3, the piston rod 7 moves down to its lower limit, whereas the other piston rod 8 is held at its upper limit, so the actuating piece 9
As a result of turning counterclockwise around pin 11,
At the same time that the stopper 13 retreats and comes off the pallet 1, the reverse prevention pawl 14, which is located at the other end of the actuating piece 9 and is engaged with the step 15 of the pallet 1, moves the step 15 in the direction of movement of the chain 2. When pushed, the pallet 1, which has been in a stopped state, is pushed out and the pallet 1 is urged to start again.

In addition, although the case where air is used as a fluid has been described above, it goes without saying that hydraulic pressure may be used instead of air pressure.

In this invention, a pin 1 is attached to each piston rod 7, 8 of two parallelly arranged first and second cylinders 3, 4.
By providing a stopper 13 and a reverse prevention pawl 14 on the actuating piece 9 which is rotatably connected at points 0 and 11, the pallet 1 sent by the free flow chain 2 can move the actuating piece 9 supporting the stopper 13 to the first position. The piston rod 7 of the first cylinder 3 rotates around the pin 10 as a fulcrum and pushes the piston rod 8 of the other second cylinder 4 to use the second cylinder 4 as a dart pot, and at this time, the pressure on the compression side of the dart pot is immediately released. At the same time as the pressure is released to normal pressure, compressive pressure is supplied to the opposite pressure reducing side and the pallet 1 is locked by the anti-reverse claw 14 of the actuating piece 9 to prevent repulsion, so the pallet moves at a constant speed. It has the advantage that it is possible to accurately stop the pallet 1 at a fixed position, as well as the pallet 1 that is moving at a slow speed for some reason. When the piston rod 7 of the first cylinder 3 on the 13 side is withdrawn, the rotation of the actuating piece 9 causes the reverse prevention pawl 14 to push the pallet 1 in the advancing direction, making it possible to rapidly feed the pallet 1. This is an extremely effective device for stopping workpieces on a conveyor that can accumulate.

[Brief explanation of the drawing]

The drawings show an embodiment of the work stop device for a conveyor capable of retaining work according to the present invention, and FIG. 1 is a side view showing a state in which pallets are progressing toward a stop position. FIG. 2 is a side view showing a state in which the pallet is stopped by a stopper and locked and fixed by a reverse movement prevention pawl. FIG. 3 is a side view showing a state in which the pilelet has restarted after stopping. 1... Pallet, 2... Free flow chain, 3... First cylinder, 4... Second cylinder,
7... Piston rod of the first cylinder, 8... Piston rod of the second cylinder, 9... Actuation piece, 1
0, 11...Pin, 12...Elongated hole, 13...Stopper, 14...Backward prevention claw, 15...Step part.

Claims (1)

[Claims] 1 two first and second cylinders 3 arranged in parallel,
Pin 1 to each piston rod 7 and 8 of 4.
0 and 11, and a stopper 13 is attached to the front end of the actuating piece 9 so that the front end of the pallet 1 comes into contact with it, and a stopper 13 is attached to the rear end so as to be located below the pallet 1. Backward prevention claw 1
4, and when the pallet 1 fed by the free flow chain 2 hits the stopper 13 and stops, the actuating piece 9 supporting the stopper 13 is rotated about the pin 10 of the piston rod 7 of the first cylinder 3 as a fulcrum. The second cylinder 4 is used as a dart pot by pushing the piston rod 8 of the other second cylinder 4, and at this time, the pressure on the compression side of the dart pot is immediately released to normal pressure, and at the same time, the pressure on the opposite side of the piston is released. Compression pressure is supplied to prevent the pallet 1 from rebounding by locking the pallet 1 with the reverse movement prevention pawl 14 of the actuating piece 9.Furthermore, when the pallet 1 is restarted, compression pressure is sent to the first cylinder 3 to prevent its piston rod. A work stop device for a conveyor capable of retaining work, which is configured to rotate an actuating piece 9 and retreat a stopper 13 by retracting a pallet 7, and at the same time push a pallet 1 in a starting direction using a reverse prevention claw 14. .