JPS6347923Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Field of the Invention This invention relates to a pallet positioning device for stopping and positioning pallets that are continuously conveyed on a conveyance path such as a conveyor.

(2) Conventional technology For example, when transporting products, semi-finished products, etc. on a production line in a factory or a transport line in a warehouse, a pallet on which the products are placed is moved by a conveyor. There is.

In such a pallet conveying device, when a traveling pallet is temporarily stopped to transfer an article, etc., a fixed stopper is installed in the middle of the pallet conveying path to stop the pallet, and then positioning is performed from the bottom. Positioning is done by protruding a pin and inserting it into a hole in the pallet, or by pushing a wedge-shaped positioning pin from the side of the pallet after it has been stopped by a stopper.

(3) Problems with the conventional technology Since the stopper is fixed, objects on the pallet may fall off or become misaligned due to the reaction of the impact when the stopper collides with the stopper, which can cause serious problems when used in an automatic assembly line. It becomes a problem. Also,
Since the pallet is stopped by the stopper and then positioned by the positioning pin, a waiting time is required for positioning, and there is a disadvantage that the actual working time for automatic assembly cannot be extended.

(4) Purpose of the invention The object of this invention is to provide a pallet positioning device that can prevent impact when the pallet is stopped, and can accurately position and maintain the pallet at the same time as it stops.

(5) Embodiment of the invention In FIGS. 1 to 3, reference numerals 1 and 1 denote a pair of side plates constituting the pallet conveyance path 2. These side plates 1,
Sprockets 3, 3 are rotatably supported at both longitudinal ends of the sprockets 1, and two roller chains 4, 4 are spanned between these sprockets 3, 3. One of the sprockets 3 is interlocked with a drive source 6 via a chain 5, and runs along the roller chains 4, 4 along guide rails 7, 7 in the direction of the arrow. Further, floating rollers 8 are attached as attachments to the upper portions of the roller chains 4, 4, and the pallets 9 are supported and conveyed by these floating rollers 8. On the lower surface of this pallet 9, guides 10, 1 are formed of protrusions that come into contact with the inner surfaces of the side plates 1, 1 to restrict lateral displacement of the pallet 9.
0 is provided protrudingly. Furthermore, a holder 11 that projects laterally is integrally provided on one side of the pallet 9 along the conveying direction, and a cam follower 12 is rotatably attached to the lower surface of the holder 11 via a rotating shaft 13. .

On the other hand, a frame 14 is fixed to the side plate 1 located on the cam follower 12 side. This frame 14
Two shafts 15, 15 are installed perpendicularly to the conveyance direction of the pallet 9, and a lateral block 17 is attached to these shafts 15, 15, which moves forward and backward with respect to the pallet 9 by means of an air cylinder 16. ing. This horizontal block 17 has two shafts 1 along the conveyance direction of the pallet 9.
8 and 18 are installed, and these shafts 1
8 and 18 are provided with longitudinal blocks 19 which are movable in the direction of conveyance of the pallets 9. and,
This longitudinal block 19 has the cam follower 1
A stopper 20 is integrally provided and protrudes from the stopper 20 facing in the direction of movement. Furthermore, this vertical block 19
is biased in a direction opposite to the direction of movement of the pallet 9 by a tension spring 21 whose one end is attached to the lateral block 17, and a shock absorber 22 provided to the lateral block 17 prevents the movement of the pallet 9. The buffer mechanism 23 is biased in the opposite direction.

Further, a bearing 24 is fixed to the upper part of the frame 14, and a shaft 25, which is slidable at right angles to the traveling direction of the pallet 9, is attached to the bearing 24.
25 are provided. A cam 26 is attached between the tips of these shafts 25, 25. This cam 26 has a gentle slope 26a and a steep slope 2.
6b, it has a substantially triangular shape, and the distance between the steep slope 26b and the stopper 20 is set such that the cam follower 12 can be held between the steep slope 26b and the stopper 20.
Further, a coil spring 27 is stretched between the end portions of the shafts 25, 25 and the bearing 24, and urges the cam 26 toward the cam follower 12 of the pallet 9.

As the roller chains 4, 4 run, the pallet 9 on the idle rollers 8 is conveyed in the direction of the arrow, and when the pallet 9 reaches the vicinity of the positioning station, the cam follower 12 first moves onto the gentle slope 26a of the cam 26. come into contact with. Therefore, the cam follower 12 pushes the cam 26 in the direction of arrow a against the restoring force of the coil spring 27, and at the same time pushes the cam 26 against the longitudinal block which is pulled back by the tension spring 21 in the opposite direction to the direction of movement of the pallet 9. It advances while pushing the stopper 20 which is integrated with the shock absorber 22. At the same time, the stopper 20 advances while also pushing the shock absorber 22. Therefore, the pallet 9 is decelerated, and when the stopper 20 finally comes into contact with the end surface 17a of the lateral block 17, the pallet 9 stops. At this time, since the cam 26 is urged toward the cam follower 12 by the coil spring 27, when the cam follower 12 comes off the gentle slope 26a of the cam 26, the cam 26 moves in the direction of arrow b. Therefore, the cam follower 12 is held between the stopper 20 and the steep slope 26b of the cam 26, and the pallet 9 is positioned at the positioning station.

When the pallet 9 is released from the positioning station, the air cylinder 16 moves the transverse block 17 in the direction of retreating from the pallet 9, and the stopper 20 moves the cam follower 1.
deviates from 2. Therefore, the pallet 9 is conveyed again in the direction of the arrow by the roller chains 4,4. At this time, the cam 26 is moved by the coil spring 27.
Since the cam follower 12 is urged in the direction of the arrow b by the restoring force of the cam 26, the cam follower 12
It is forcibly pushed in the direction of travel by the force, which works to increase the initial velocity.

(6) Effects of the invention As explained above, this invention provides a stopper movable in the conveying direction of the pallet that comes into contact with a cam follower provided on the pallet to provide braking, and a cam that slides on the cam follower to provide braking. The cam follower can be freely protruded perpendicular to the direction of movement of the stopper, and after the cam follower comes into contact with the stopper, the cam follower is held between the stopper and the cam, so that no impact is applied when the pallet is stopped. It is possible to accurately position and stop at a predetermined position. Therefore, it is suitable as a conveyor for automatic assembly lines, and productivity can be improved.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a partially cutaway side view, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along the line shown in FIG. 2. 2... Pallet transport path, 9... Pallet, 12
...Come follower, 20...Stoppa, 26...
cam.

Claims (1)

[Scope of utility model registration request] A stopper is provided in the middle of a pallet conveying path provided with a cam follower on at least one side along the conveying direction, and is movable reciprocally along the conveying direction of the pallet, and applies braking to the pallet via the cam follower. and a cam which is provided so as to be able to protrude and retract at right angles to the direction of movement of the stopper, and which slides on the cam follower to provide braking, and which protrudes when the stopper comes into contact with the stopper and positions the cam follower by sandwiching it between the stopper and the stopper. A pallet positioning device characterized by: