JPS6335467B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pallet conveying device for conveying a plurality of pallets in a predetermined direction using a conveying member, and its objects are as follows.

Namely, (1) the impact generated when a subsequent pallet collides with a stopped pallet is alleviated, and the floating, misalignment, etc. of conveyed objects placed on the pallet are eliminated;

(2) By alleviating the impact when a pallet collides with the pallet, the pallet conveyance speed is increased and productivity is improved.

(3) When a pallet is stopped due to a rear-end collision, the load on the drive unit of the conveyor body is reduced by minimizing the conveying force.

(4) Pallets can be easily replaced by making them removable from the main body of the conveying device.

Conventionally, in order to reduce the impact when pallets collide with each other, a shock absorbing member such as urethane has been provided on the wall surface on the opposite side of the pallet traveling direction. That is, as shown in FIG. 1, a shock absorbing member 4 made of urethane is fixed with bolts or the like to a pallet 3 that is placed on a chain 2 as a conveying member of a conveying device main body 1 and conveyed in the direction of the arrow. It was hot. However, with this type of device, it is impossible to sufficiently reduce the impact, and the conveying force of the pallets is not reduced at all.

The present invention eliminates such conventional drawbacks, and one embodiment thereof will be described below with reference to FIG. 2 and subsequent drawings.

FIG. 2 shows the pallet conveying device of this embodiment, in which a chain 7 as a conveying member for conveying pallets 6 is arranged in the conveying device main body 5 so that it is always driven to run at a constant speed in the direction of the arrow. has been done.
Bearings 8 are arranged near each of the four corners on the bottom surface of the pallet 6 to facilitate movement, and these bearings 8 are rotatably attached to the pallet 6. A sprocket 9 is rotatably attached to the side surface of the pallet 6, and a recess 11a of a brake arm 11, which rotates about a support shaft 10, is biased by a brake spring 12 in the sprocket 9. It is pressed. This brake arm 11 is pressed against the sprocket 9, and by stopping its rotation, the pallet 6 receives driving force from the chain 7, and the pallet 6 is conveyed in the direction of the arrow. Further, rods 14 are movably attached to the pallet 6 at its supporting portions 6a and 6b. This rod 14 moves along the advancing direction of the pallet 6, and a lock ring 1 provided on the rod 14
The pallet 6 is always urged in the direction of movement by a shock absorbing spring 15 interposed between the pallet 7 and the support portion 6a. The brake arm 11 is attached to the rod 14 above.
Cam 16 for pushing down one end 11b
and a lock ring 17 are fixed with screws or the like. Further, a bumper 13 is fixed to the pallet 6 so as to face the support portion 6b thereof, and a camshaft 18 is provided on the bumper 13 so as to protrude therefrom.
Further, the pallet 6 is provided with a lock arm 20 which contacts the camshaft 18' of another pallet 6' in front and rotates about the shaft 19, and this arm 20 is suspended between the pallet 6 and the pallet 6. It is constantly urged to rotate clockwise by a tension spring 21.
A vertically movable locking rod 22 is provided at one end of this locking arm 20, and this locking rod 22 is pushed upward by a compression coil spring 23.

Next, the operation of the above embodiment will be explained. The pallet 6 moves forward and when one end of the rod 14 hits the bumper 13' of the preceding pallet 6' which is stopped at a predetermined position, the rod 14 is moved rearward against the force of the shock absorbing spring 15 and The pallet 6 is then decelerated while compressing the spring 15. At this time,
The difference in speed between the pallet 6 and the chain 7 is due to the frictional force between the sprocket 9 and the brake arm 11, which causes the thrust from the chain 7 to prevail, causing the sprocket 9 to
is absorbed by rotation. Furthermore, palette 6
When the pallet 6' moves forward, as shown in Figure 3, the pallet 6'
The camshaft 18' of the pallet 6 is connected to the lock arm 20 of the pallet 6.
The lock arm 20 is in contact with the other end of the pallet 6.
As the locking rod moves forward, it rotates counterclockwise, and the locking rod 22 begins to come into contact with the locking ring 17. Further, as the pallet 6 moves forward while decelerating, the shock absorbing spring 15 is further compressed and the rod 14 moves rearward as shown in FIG. Get into it. At this time, cam 16
contacts the other end of the brake arm 11, and the brake arm 11 rotates clockwise until the recess 11a
is separated from the sprocket 9, the sprocket 9 spins idly, and the thrust of the pallet 6 is released. In this way, pallet 6 precedes and stops pallet 6'.
A shock absorbing spring 15 absorbs the impact generated during a rear-end collision with the pallet, and the rod rod 22 engages with the lock ring 17 to prevent the pallet from flowing backward due to the repulsion of the absorbed energy. Therefore, the pallet can be stopped and the thrust from the chain of the pallet 6 when stopped is minimized. It goes without saying that if the preceding pallet 6' starts moving forward again, the above operation will be reversed and the pallet 6 will also start moving forward again. Also,
All pallets such as pallets 6 and 6' have the same construction and can be removed from the chain 7 and main body 5.

As described above, according to the pallet conveying device of the present invention, the following effects can be obtained.

(1) The impact when pallets collide with each other is alleviated, so there is no floating or shifting of the conveyed objects on the pallets due to the impact.

(2) Since the shock caused by a rear-end collision can be alleviated, the pallet conveyance speed can be increased compared to the conventional method.

(3) Since the conveying force on the pallets is reduced when stopped, the load on the drive unit is reduced when many pallets are collected in one place, and the conveying device can be made smaller.

(4) Since the pallet is simply placed on the main body of the conveyor, it can be removed at any location, and subsequent pallets that collide with the pallet can be stopped at that location. There is no effect on the palette.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional pallet conveying device, FIG. 2 is a perspective view showing a pallet conveying device in an embodiment of the present invention, and FIGS. 3 and 4 are diagrams for explaining the operation of the device. FIG. 3 is a side view of main parts. 5... Device body, 6, 6'... Palette, 7...
...transfer chain, 9...sprocket, 11...
Brake arm, 14...rod, 16...cam, 17...lock ring, 18...camshaft, 2
0...lock arm, 22...lock lock.

Claims (1)

[Claims] 1. In a conveyance device that conveys a plurality of pallets in a predetermined direction using conveyance driving force from a conveyance member, a pallet is attached to the pallet so as to be movable in the direction in which the pallets travel and always urged forward by a shock absorbing spring. a brake arm that is rotated by a cam provided on the rod when the rod collides with the preceding pallet and moves against the biasing force of a shock absorption spring; The rod has a locking rod that locks into a lock part provided on the rod when the shock absorbing spring is compressed when the rod collides with the preceding pallet, and when the preceding pallet starts moving forward, the distance from the preceding pallet is a predetermined distance. a lock arm associated with a camshaft provided on the preceding pallet so as to maintain the locked state by the lock lock until the pallet is rotated, and a transmission mechanism that releases the conveying drive force to the pallet by rotation of the brake arm. A pallet conveying device characterized by comprising: