JPH0115561Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a pallet conveyor that circulates a plurality of pallets in a free cycle and stops them at a predetermined work station. Related to pallet mooring equipment.

Conventionally, this type of pallet conveyor has a main transfer path having an endless chain that circulates in a fixed direction within a horizontally arranged conveyor frame, and an endless chain that circulates in a direction opposite to the direction of movement of the endless chain. It consists of a reverse transfer path, a first transfer device that transfers pallets from the main transfer path to the reverse transfer path, and a second transfer device that transfers pallets from the reverse transfer path to the main transfer path. Furthermore, work stations are arranged at predetermined positions on this pallet conveyor, and a work unit is attached to each work station. With this pallet, if another pallet collides with another pallet while the pallet is stopped by a stopper mechanism (not shown) disposed in the work station, the movement of this pallet is stopped. A pallet mooring device 7 is arranged which rotates the rotating shaft 8 of the pallet 1 that collides with the pallet 1 by the dog 11 of the pallet 1, and switches the traction force received by the sprocket 13 from the endless chain 3 to the rotation of the sprocket 13. In this pallet mooring device 7, it takes a little time to switch the traction force received by the sprocket 13 to the rotation of the sprocket 13, so even after the pallet 1 collides with the stationary pallet 1, the pallet 1 is still towed. Therefore, the rotating shaft 12 held by the pallet 1 is elastically biased by a spring 24 so that the sprocket 13 can rotate together with the sprocket 13 or can slip if subjected to a force exceeding a predetermined value. However, in this pallet mooring device 7, if the assembly parts moving on the pallet conveyor are changed to heavier ones, it is necessary to increase the spring pressure of the spring 24 accordingly. The spring 24 must be disassembled to replace it, or the spring pressure must be adjusted by inserting a spacer between the two, which not only takes time, but also is extremely complicated and takes a long time to adjust. There are disadvantages such as the need for

The purpose of this invention is to eliminate the above drawbacks.
Examples will be described below with reference to the drawings. In FIGS. 1 and 2, 1 is a pallet that moves together with an endless chain 3 held on a conveyor frame 2, and this pallet 1 is guided by a guide shaft 4 fixed on the conveyor frame 2. A roller 5 fixed to the lower end is configured to roll along the side surface of the conveyor frame 2. A rod 6 is installed in the center of the pallet 1, and the rod 6 is configured to be engaged with a stopper mechanism (not shown) disposed at a work station to stop the pallet 1. .

A pallet mooring device 7 is arranged on the pallet 1 before and after the rod 6. This pallet mooring device 7 has a rotating shaft 8 rotatably held by the pallet 1, and this rotating shaft 8 is located so as to extend parallel to the endless chain 3. A first release lever (not shown) is fixed to the center of the rotating shaft 8, and an operating shaft 9 is connected to the first release lever. This operating shaft 9 is connected to the pallet 1
It is arranged so as to be movable in a direction intersecting the rotating shaft 8, and is configured so that when the pallet 1 is stopped by the stopper mechanism, a part of the stopper mechanism contacts and moves the operating shaft 9. . Further, on the forward and backward sides of the rotating shaft 8 that is a predetermined distance away from the first release lever, clutch pawls 19, which will be described later, are provided.
A stopper 23 is fixed correspondingly to the clutch pawl 19, and the stopper 23 is configured to rotate together with the rotation shaft 8 and separate from the clutch pawl 19.

A second release lever 10 that rotates together with the rotation shaft 8 is fixed to the forward end of the pallet 1, while a second release lever 10 is fixed to the backward end of the pallet 1 at a position corresponding to the second release lever 10 of the rear pallet 1. A dog 11 is fixed. Further, the second release lever 10 has an inclined surface, and is configured to rotate when a dog 11 of a pallet in front comes into contact with it, thereby rotating the rotation shaft 8 by a predetermined angle.

On the other hand, a rotating shaft 12 is rotatably arranged on the pallet 1 so as to intersect with the rotating shaft 8,
A sprocket 13 is fixed to this rotating shaft 12. Further, the sprocket 13 is arranged so as to mesh with the endless chain 3, and is configured to receive a traction force as the endless chain 3 circulates. The rotating shaft 12 is housed in a bearing case 15 via a needle bearing 14, and this bearing case 15 is housed in the pallet 1. A notch 16 is cut in the upper part of the bearing case 15 to correspond to the needle bearing 14, and the rotary shaft 12 is configured to be movable along this notch 16. Further, the needle bearing 14 and an adjustment screw 18 to be described later are provided in the notch 16.
A release spring 17 is disposed between the
The rotating shaft 12 is always urged downward, and the spring pressure is adjusted by an adjusting screw 18 screwed into the pallet 1.

A clutch claw 19 is fixed to the other end of the rotating shaft 12 via a clutch shaft 20, and this clutch shaft 20 is held by a spherical bearing 21, so that the rotating shaft 12 swings around the clutch claw side. is configured to do so. The spherical bearing 2
1 is housed in the pallet 1 via a second bearing case 22, and this second bearing case 22 is connected to the bearing case 15. Further, the clutch pawl 19 is configured to engage with a stopper 23 fixed to the rotation shaft 8, and the clutch pawl 19 is configured to engage with a stopper 23 fixed to the rotation shaft 8,
It is configured to stop the rotation of the sprocket 13 received from the sprocket. Therefore, the traction force applied to the sprocket 13 from the endless chain 3 by the rotation of the rotation shaft 8 is switched to the rotation of the sprocket 13, and the pallet 1 is configured to stop at that position.

In the pallet mooring device described above, when another pallet 1 collides with a pallet 1 that is stationary at a work station, the dog 11 of the pallet 1 that is stationary rotates the rotating shaft 8 of the pallet 1 that collides with the pallet 1, thereby reducing the traction force of the endless chain 3. Switch to rotation of sprocket 13.
At this time, it takes time to switch the traction force to rotation, so even though pallet 1 collides with the stationary pallet 1 and stops, the sprocket 13
receives the traction force from the endless chain 3. Therefore, as the endless chain 3 moves, the sprocket 13 receives more than a predetermined force, and the sprocket 13
3 is the notch 1 of the bearing case 15 as shown in FIG.
6 from the endless chain 3. Thereafter, the clutch pawl 19 and the stopper 23 are completely disengaged, and at the same time the sprocket 13 again engages with the endless chain 3, the sprocket 13 rotates at that position, and the pallet 1 is moored at that position.

As explained above, in the present invention, the sprocket that receives the traction force from the endless chain is configured to be rotatable or to slide off the endless chain when a predetermined force is applied, thereby preventing the pallet from colliding with a stationary pallet. Even after stopping, the sprocket or endless chain will not be damaged even if it is subjected to traction force from the endless chain, and the pallet can be reliably moored. There are advantages such as no damage to the fingers even if the fingers are caught between the two. In addition, the present invention is constructed so that the sprocket and the endless chain are urged to mesh with each other by a spring, and the spring pressure is adjusted by an adjustment screw screwed into the pallet, making it extremely easy to adjust the spring pressure. This method has the advantage that even if the weight of the assembled parts changes, it can be handled with extremely simple work.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the main parts of the pallet conveyor according to the present invention, Fig. 2 is an enlarged sectional view of the main parts along line A-A in Fig. 1, and Fig. 3 is a main part showing the operating state of the present invention. FIG. 4 is a sectional view of a main part showing a conventional example. 1...Pallet, 2...Conveyor frame, 3
...Endless chain, 4...Guide shaft, 5...
...roller, 6...rod, 7...pallet mooring device, 8...rotating shaft, 9...operating shaft, 10...second
Release lever, 11... Dog, 12... Rotating shaft, 1
3...Sprocket, 14...Needle bearing, 1
5... Bearing case, 16... Notch, 17... Release spring, 18... Adjustment screw, 19... Clutch pawl, 20... Clutch shaft, 21... Spherical bearing, 2
2...Second bearing case, 23...Stopper, 24
...Spring.

Claims (1)

[Claims for Utility Model Registration] An endless chain 3 that circulates is arranged on the conveyor frame 2, and the pallet 1 is moved in the opposite direction to the main transfer path that moves the pallet 1 in a predetermined direction as the endless chain 3 moves. In this pallet conveyor, a rotating shaft 8 extending parallel to the endless chain 3 is rotatably disposed on the pallet 1, and a stopper 23 is fixed to the rotating shaft 8. A bearing case 15 is housed in the pallet 1, and a rotary shaft 12 intersecting with the rotary shaft 8 is rotatably disposed within the bearing case 15 via a bearing, and an endless chain 3 is engaged with one end of the rotary shaft 12. A clutch pawl 19 that engages with the stopper 23 is fixed to the other end of the sprocket 13, and the clutch pawl side of the rotating shaft 12 is rotatably and swingably held by a spherical bearing 21. A notch 16 corresponding to the bearing is provided in the upper part, and the rotary shaft 12 is configured to be movable along the notch 16. An adjusting screw 18 is screwed into the pallet 1, and a screw is inserted between one end of the adjusting screw 18 and the bearing. A pallet mooring device characterized in that a release spring 17 is arranged.