JP2830727B2 - Roller drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller driving device for a roller conveyor.

[0002]

2. Description of the Related Art The following are known as conventional roller conveyors. That is, a base frame, a large number of rollers rotatably provided so that the axis of the base frame was oriented in the left-right direction, wheels fixed to the shafts of these rollers, and the wheels hung on these wheels. An endless drive chain is known, in which a roller is rotated by driving the drive chain.

[0003]

Disadvantages of the prior art The conventional roller conveyor has the following disadvantages. That is, since all the rollers are directly rotated by one endless drive chain, the roller conveyor is divided at predetermined intervals in the transport direction, and only the rollers in the divided zone are stopped. Could not. Of course, it is possible to stop only the rollers in the divided zones by providing a motor and an endless drive chain for each zone, and stopping only the motor in the zone in which the rotation of the rollers is to be stopped. In such a case, since a motor is required for each zone, there is a disadvantage that the cost is increased.

[0004]

The present invention employs the following means to solve the above-mentioned drawbacks. The present invention relates to a roller rotatably fitted on a support shaft, a drive wheel rotatable on the support shaft and slidable in the axial direction, and capable of contacting and separating from the roller, and a roller contacting the roller. was made freely contact and away from has a brake plate, before
The drive wheel and brake plate are each a roller.
Urged by a spring, etc.
Selective for roller against biasing force of spring etc. by means
It is designed to be brought into contact with the object.

[0005]

The present invention has the following functions. The roller can be rotated by pressing the drive wheel against the roller. On the other hand, by moving the drive wheel away from the roller, the rotation of the roller can be stopped. In addition, the present invention, as shown in an embodiment described later, stops the following article before the article being conveyed collides with the preceding article by combining with an article detector or the like, that is, the following article is stopped. It is suitably used for a roller conveyor or the like having a mechanism that does not push forward articles or collide with forward articles.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. In this specification, the front means the right side of FIG. 1, the rear means the left side of FIG. 1, and the left means the back side of FIG.
Right means the same side.

The roller conveyor 1 includes a base frame 2, a large number of non-rotatable spindles 3 provided at predetermined intervals in the front-rear direction with the axis of the base frame 2 oriented in the left-right direction, and these spindles 3. Each has a carrier roller 4 (a roller in the claims) rotatably provided.

[0008] The roller conveyor 1 has a plurality of zones 5 divided at predetermined intervals longer than the articles W in the transport direction, and these zones 5 have four carrier rollers 4.

The left and right ends of the carrier roller 4 are formed as friction plates 7.

A drive wheel 9 composed of a wheel for a timing belt is fitted on the right side of the support shaft 3 so as to be rotatable and movable left and right. This drive wheel 9 is
0 urges the carrier roller 4 away from the friction plate 7 on the right side. The drive wheel 9 is formed with a recess 11 having an open right side.
A closing plate 12 having an enclosed space 1 is fixed to the support shaft 3, and on the left surface of the closing plate 12, a large number of balls 13 receiving the drive wheel 9 urged by a spring 10 are partially exposed. It is provided rotatably. With such a configuration, the drive wheel 9 rotates smoothly even when the drive wheel 9 moves to the right side according to the force of the spring 10. The closing plate 12 has an air port 16.
Are formed. As shown in FIG. 1, the air ports 16 belonging to the same zone 5 are connected to the same branch pipes 17, and each branch pipe 17 is connected to one outlet port of a three-port electromagnetic switching valve 18. One outlet port is open to the atmosphere. A main pipe 19 is connected to the inlet port of the electromagnetic switching valve 18, and a pressure source (not shown) is connected to the main pipe 19. The electromagnetic switching valve 18
Can be in a state where the main pipe 19 is connected to the branch pipe 17 and a state where the main pipe 19 is closed and the branch pipe 17 is connected to the atmosphere. With such a configuration, when the main pipe 19 and the branch pipe 17 are connected to each other, air is supplied to the recess 11, and the constantly rotating drive wheel 9 moves to the left against the force of the spring 10. As a result, the carrier roller 4 rotates because it comes into contact with the friction plate 7 on the right side of the carrier roller 4, while the main pipe 19 is closed and the branch pipe 17 is connected to the atmosphere. Is moved to the right side and is separated from the friction plate 7 on the right side, so that the carrier roller 4 stops. As is clear from this description, the biasing force of the spring 10
The actuation means for actuating the drive wheel 9 in opposition to this
In the embodiment, the compressed air is used.

A timing belt 22 is wrapped around all the drive wheels 9, the front and rear main wheels (not shown), and the tension wheels (not shown) so that the uneven side faces outward. One of the main wheels (not shown) is a drive wheel that constantly rotates. Further, a pressing roller 23 is rotatably provided on the base frame 2 so that the timing belt 22 does not come off the driving wheel 9.

A brake plate 25 is connected to the left side of the support shaft 3 by a spline connection (connected by a known mechanism that slides in the left-right direction but does not rotate with respect to the support shaft 3).
The brake plate 25 is urged by a spring 26 in a direction away from the friction plate 7 on the left side of the carrier roller 4. The brake plate 25 forms an airtight chamber with the cylinder 27 fixed to the support shaft 3 and opened to the right.
An air port 28 is formed in the cylinder 27,
The air ports 28 belonging to the same zone 5 are provided with an air supply mechanism (not shown) having the same configuration as the branch pipe 17, the electromagnetic switching valve 18, and the main pipe 19 described above. With such a configuration, when air is supplied into the cylinder 27, the brake plate 25 moves to the right against the force of the spring 26 and abuts against the friction plate 7 on the left side of the carrier roller 4. It is stopped, and on the other hand, when the air in the cylinder 27 is exhausted,
The brake plate 25 is moved to the left by the force of the spring 26, so that the carrier roller 4 becomes rotatable. As is clear from this description, the urging force of the spring 26
The actuation means for actuating the brake plate 25 in opposition to this
In the embodiment, the compressed air is used.

As shown in FIG. 1, an article detector 30 is provided at a front position of each zone 5 on the base frame 2.
As the article detector 30, transmission type or reflection type sensors using signals such as light, radio waves, and sound waves, mechanical switches by contact with the article W, and the like can be used. When the article W is detected by the article detector 30, the air is exhausted from all the air ports 16 belonging to the zone 5 on the succeeding side (immediately after) the zone 5 to which the article detector 30 belongs, and the drive wheel 9 is moved to the right. When the carrier roller 4 comes to a stop, the air is supplied from the air port 28 and the brake plate 25 comes into contact with the left friction plate 7, while the article detector 30 detects the article W. If not, the air is supplied from the air port 16 and the drive wheel 9 contacts the right friction plate 7, and at the same time, the air is exhausted from the air port 28 and the brake plate 25 is separated from the left friction plate 7. ing.

[0014]

Next, the operation of the embodiment will be described. When all the article detectors 30 do not detect the article W, all the carrier rollers 4 in all the zones 5 are rotating. When the article detector 30 detects the article W being conveyed,
Subsequent side (immediately after) of zone 5 where the article detector 30 is located
The air is exhausted from all the air ports 16 in the zone 5 of all the carrier rollers 4 in the subsequent side zone 5.
Stop the rotation of. At the same time, brake plate 2
5 operates as described above. That is, the subsequent article W is temporarily stopped just before the collision if the article W is immediately ahead. Therefore, the article W is located ahead of the article W.
Is not pressed or does not collide with the article W ahead. When the carrier roller 4 in the zone 5 immediately after the subsequent zone 5 is rotating, it goes without saying that the article W in the zone 5 immediately after the subsequent zone 5 is sent forward. Become. When the article W in the preceding zone 5 is sent out, the air is supplied to the air port 16 of the zone 5 on the succeeding side, and the air is exhausted from the air port 28 on the contrary. The stopped article W is sent forward again.

The support shaft 3 may be rotatable so that the support shaft 3 and the drive wheel 9 rotate together.
However, in this case, since the brake plate 25 must not rotate, the brake plate 25 is provided not on the support shaft 3 but on the base frame 2 so as to be movable left and right.

[0016]

According to the present invention, the following effects can be obtained by the above configuration. By sliding away the driving wheel from Russia Ra, it can be easily stopped only the rotation of the desired roller. Since only the rotation of the desired roller can be easily stopped without unnecessarily increasing the number of motors, the cost is low. The brake plate by the bringing into contact with the roller, b <br/> Ra can be prevented from being inadvertently rotated. Drive wheel and brake plate are each roller
It is always urged by a spring etc. in the direction away from
Selectively against the roller against the biasing force of the spring, etc.
The drive wheel and
A spring is used to keep the brake plate in contact with the roller.
Bias the drive wheel and brake plate when necessary.
Be separated from the roller against the urging force
If the spring deteriorates and the spring force weakens, the drive wheel
The contact force between the wheel and brake plate against the roller is weakened,
Power transmission from the wheels to the rollers is no longer ensured
And the brake operation has not been performed reliably
However, there is no such fear in the present invention.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged view of a part A of FIG. 1;

[Explanation of symbols]

 3 Support shaft 4 Carrier roller 7 Friction disc 9 Drive wheel 25 Brake plate

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-137817 (JP, A) JP-A-7-17616 (JP, A) JP-B 46-9488 (JP, B1) 30242 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B65G 13/00-13/12

Claims (2)

(57) [Claims] 1. A roller rotatably fitted on a support shaft, a drive wheel rotatable on the support shaft and slidable in the axial direction, and capable of contacting and separating from the roller.
The roller has a brake plate which can be freely contacted and separated from the roller, and the drive wheel and the brake plate are respectively
Is urged away from the roller by a spring or the like
At the same time, the actuation means lowers the urging force of the spring etc.
A roller driving device adapted to selectively contact the roller. 2. A roller rotatably fitted on a rotatable support shaft, and a drive wheel rotatable about the support shaft, but slidable in the axial direction so as to abut and separate from the roller. And a brake plate made to be able to abut and separate from the roller. The drive wheel and the brake plate
Are separated by springs in the direction away from the rollers.
As well as the urging force of a spring or the like by the operating means.
To be able to selectively contact the roller against
It is to have the roller drive.