JPH07291415A - Accumulation conveyor - Google Patents

Abstract

PURPOSE:To provide a device for carrying out secure accumulation operation by interposing freely rotating rollers between work-conveying rollers and an endless belt being endlessly turned by a motor so as to be capable of being connected or disconnected. CONSTITUTION:When a sensor 20 detects a downstream work 21 to stop the subsequent work 21 on rollers 4, the rod of an air cylinder 14 is shortened. Then, a roller frame 15 connected thereto is pulled, and also a set of rollers 16 moves on the rail. Since the rollers 16 are separated from the rollers 4 and are positioned between two rollers 4, the movement of a transmission belt 8 is transmitted only to the rotation of the rollers 16 and is not transmitted to the rollers 4. When there is no work 21 on the downstream side, the rod of the air cylinder 14 is elongated. Then, the roller frame 15 is pushed, and a set of rollers 16 move on the rail, and the respective moving set of rollers 16 are interposed between the respective rollers 4 and the transmission belt 8, and the rollers 4 are turned by the rotation of the abutting rollers 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator. That is, when the workpieces sequentially flowing on the conveyor are accumulated on the downstream side, the workpieces are stored on the conveyor without contacting each other, and when the workpieces are exhausted on the downstream side, the workpieces are sequentially moved. Regarding the accumulator.

[0002]

2. Description of the Related Art A conventional accumulator is a device as shown in FIGS. In the accumulator of Conventional Example 1 shown in FIG. 7, a transmission chain 31 is circulated by a sprocket 30 attached to a motor 6 with a speed reducer. The transmission chain 31 causes the sprocket-equipped rollers 32 arranged under each roller 4 to be constantly rotating. Then, the cylinder device 33 moves up only by the block that needs to move the work 21, and the roller 4 contacting the sprocket-equipped roller 32 is rotated by friction to move the work 21. The cylinder device 33 is provided below each roller 32 with a sprocket.

The sensor 20 is for confirming the presence or absence of the work 21. When the work 21 in the block on the downstream side is exhausted, the electromagnetic valve 34 is operated, air is sent through the air pipe 35, and the cylinder device 33 rises. At this time, there is a cylinder device 33a that moves in the opposite direction in each block. Cylinder device 33 that moves in the opposite direction
a is stopper 3 instead of roller 32 with sprocket
6 is fixed. Therefore, when the cylinder device 33a is raised, the roller 4 is fixed and the work 21 stops.
When lowered, the roller 4 becomes free and the work 21 moves.

In the structure in which the cylinder device 33 moves up to transmit the power of the transmission chain 31 to the roller 4 as rotation, the shaft of the roller 32 with a sprocket tilts when the cylinder device 33 moves up, and the part of the roller that rotates freely about the shaft. Only the roller 32 contacts the roller 32, and the friction causes the roller 4 to rotate.

Further, in the conventional example 2 as shown in FIG. 8, the transmission chain 31 is circulated and the roller 32 with the sprocket is always rotated. When it is desired to move the work 21, the cylinder device 33 of the block is raised to bring the sprocket-equipped roller 32 into contact with the roller 4, and the friction causes the roller 4 to rotate, thereby moving the work 21 on the roller 4. One sprocket roller 32 housed in the housing 37 is rotated by the fulcrum 38 of the housing 37 when pushed up by the cylinder device 33.
It contacts one roller 4.

[0006]

In the case of the conventional example 1, cylinder devices are required for the number of rollers. There is a drawback that a large number of air pipes are required to connect to this cylinder device.

Further, since the cylinder device is raised by the pressure of the air and the rotational force of the roller with the sprocket is transmitted to the roller, if a high rotational force or driving force is to be obtained, a higher pressure of the air is required. was there.

In the method of Conventional Example 2, two rollers can be rotated with one cylinder device and one roller with a sprocket, and although the cylinder device and the roller with a sprocket have the advantage of requiring only half of the rollers, There were the drawbacks that the roller pitch could not be widened, and the drawback that the positional relationship between the roller shaft center and the fulcrum was required to be accurate.

Further, both the conventional examples 1 and 2 have a problem that the number of parts of the device is increased and the cost is increased.

It is an object of the present invention to provide a device having a simpler structure and performing a more effective and reliable accumulation operation.

[0011]

In the accumulation conveyor of the present invention, a freely rotating roller is interposed between a roller for conveying a work and an endless belt, which is endlessly rotated by a motor, so as to be freely detachable.

Further, according to the present invention, a plurality of rollers that freely rotate by a cylinder device are interposed between a plurality of rollers that convey a work and an endless belt that rotates endlessly by a motor so that the rollers can be freely contacted and detached. It is an accumulator that can freely rotate.

The accumulator according to the present invention has a structure in which a plurality of freely rotating rollers are horizontally moved by one cylinder device and a plurality of rollers for conveying a work are brought into contact with an endless belt which is endlessly rotated by a motor. It has a plurality of rollers that can freely rotate.

[0014]

The roller, which conveys the work, and the endless belt, which rotates endlessly by the motor, are provided so that the freely rotating roller is brought into contact with or separated from the roller.

The freely rotating roller is moved by a cylinder device and is interposed between the roller and the belt to transmit the rotation of the belt to the plurality of rollers. Multiple rollers rotate,
The rollers are rotated because they are transmitted to the rollers that contact them.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIGS. 1 to 6 which are drawings showing an embodiment.

The accumulation conveyor according to the present invention is a device in which a large number of rollers 4 are rotatably provided between a frame 3 supported by a jack stand 1 and a pedestal 2. In this embodiment, six rollers are provided as one set, and four sets of rollers 4 are provided in one frame, and the total number of rollers 4 is 24.

A drive base 5 is attached to the frame 3 and the pedestal 2, and a motor 6 with a reduction gear is attached to the drive base 5. A drive pulley 7 is attached to the motor 6 with a reduction gear, and a transmission belt 8 is rotated endlessly via an end pulley 9 and a return pulley 10.

The belt frame 11 is bridged above the two pillars 2 on one side to a position below the frame 3. The belt frame 11 includes a rail 12, an endless pulley 9,
A return pulley 10 is provided. The rail 12 is provided over the length of the belt frame 11, and the transmission belt 8 is run on the rail 12. The distance between the rail 12 and the lower end of the roller 4 on the rail 12 is smaller than the diameter of the roller 16.

One frame 3 has a pair of rollers 4
One cylinder support 13 is provided for each (six in this embodiment). Each cylinder support 13 is provided with an air cylinder 14. As another example,
The same applies when an electric motor cylinder, an electromagnet, a hydraulic cylinder or the like is used as a drive source instead of the air cylinder 14.

The roller frame 15 is attached to the rod portion of the air cylinder 14, and the length of one roller frame 15 corresponds to the length of six rollers 4 in one set. The roller frame 15 has five rollers 16 excluding one air cylinder 14 minutes from the number of rollers 16
Is rotatably provided. If the pitch of the rollers 4 is coarse, the same number of rollers 16 can be provided.

The surface of the roller 16 is made of a material having a high friction coefficient. The roller 16 is always placed and in contact with the transmission belt 8 moving on the rail 12 provided on the belt frame 11.

Since the roller frame 15 is provided with a long hole 17 on its side surface, and the frame detent pin 18 protruding horizontally from the frame 3 is inserted into the long hole 17,
The roller frame 15 is kept vertical and the roller 16 is also kept vertical.

A plurality of stoppers 19 are fixed to the roller frame 15. In this embodiment, there are two. The stopper 19 is provided at a position between the two rollers 16 and has a sloped surface that comes into contact with the surface of the roller 4 when the roller 16 is separated from the roller 4. The stopper 19 is made of a material having a rough surface and a high friction coefficient.

A sensor 20 is provided on the frame 3 on the side opposite to the side on which the belt frame 11 is located. The number of sensors 20 is equal to the number of air cylinders 14, and one sensor 20 is arranged between the most downstream roller 4 of the pair of rollers 4 and the adjacent upstream roller 4.

Further, as another embodiment, in place of the rail 12, a rotatable roller support roller 22 may be provided below each roller 16. Roller support roller 22
Are fixed to the belt frame 11 under the respective rollers 16 instead of the rails 12. When the roller support rollers 22 are provided, even if the drive belt 8 on the antegrade side is pressed by the heavy work 21, excessive friction is not applied to the drive belt 8 as compared with the case of the rail 12.

Reference numeral 21 is a work. The accumulation conveyor flows on the roller 4 from the upstream side to the downstream side, but when the downstream side stops, the upstream side also sequentially stops so as not to collide.

Next, the operation of the present invention will be described.

When the motor 6 with a reducer is operated, the drive pulley 7 rotates and the transmission belt 8 circulates between the end pulley 9 and the return pulley 10. The transmission belt 8 runs on the rail 12 on the forward side, and the roller 16 placed in contact with the transmission belt 8 also rotates while the transmission belt 8 is circulating.

When the sensor 20 detects the work 21 on the downstream side and stops the next work 21 on the roller 4,
As shown in FIG. 3, the rod of the air cylinder 14 is shortened. Then, the roller frame 15 connected to this is pulled and moves, and one set of rollers 16 also moves on the rail. And roller 1
Since 6 is separated from the roller 4 and located between the two rollers 4, the movement of the transmission belt 8 is stopped by the rotation of the roller 16 and is not transmitted to the roller 4. At the same time, the stopper 19 contacts the roller 4, so that the rotation of the roller 4 is quickly stopped.

Next, the sensor 20 moves the work 2 to the downstream side.
When it is confirmed that there is no 1, the rod of the air cylinder 14 is extended. Then Coroframe 1 connected to this
5 is pushed, and one set of rollers 16 also moves on the rail 12. The long hole 17 keeps the roller frame 15 vertical and restricts lateral movement. The movement of the roller frame 15 is
It moves to the stroke end of the air cylinder 14.
Each of the pair of rollers 16 moving while rotating is interposed between each roller 4 and the transmission belt 8 and
Is rotated by the rotation of the roller 16 in contact therewith. Roll 16
Has a large friction coefficient, the movement of the transmission belt 8 is transmitted to the rollers 16 and the rollers 4 only by being pushed between the transmission belt 8 supported on the rail 12 and the roller 4.

Even if the pushing force of the rod of the air cylinder 14 is not so large, once the roller 16 comes into contact with the roller 4, it becomes as if it was caught between the transmission belt 8 and the roller 4, so that the rotational force of the roller 4 is increased. Is strong.

Since the weight of the work 21 itself can be changed by the frictional force of the roller 4, the roller 16 and the transmission belt 8, it is easy to convey heavy objects.

When the work 21 is a light one, the roller 4 is rotated and the work 21 is transported by merely abutting the roller 16 lightly without inserting the roller 16 right under the roller 4.

Further, when the work 21 is heavy,
There is a concern that the friction between the transmission belt 8 and the rail 12 will be strong, but instead of the rail 12 as in the second embodiment,
When the rollers 22 for supporting the rollers are provided, the circulating friction of the transmission belt 8 is reduced even when the same work 21 is carried, so that the output of the motor 6 with a reduction gear can be small.

[0036]

[Effect] Therefore, according to the present invention, compared to the conventional
Since the number of parts is small, there is an effect that there are few failures and efficient operation and work can be performed.

Since the number of cylinders per unit is small, there is an effect that the length of the pressure pipe is short and the corner pressure can be efficiently used.

[Brief description of drawings]

FIG. 1 is a front view of an accumulation conveyor which is an embodiment of the present invention.

FIG. 2 is a plan view of the same.

3 is a cross-sectional explanatory view taken along the line AA of FIG.

FIG. 4 is a partial front view showing a roller in a stopped state.

FIG. 5 is a partial front view showing a roller in a rotating state.

FIG. 6 is a partial front explanatory view of another embodiment.

FIG. 7 is a front explanatory view of the accumulation conveyor of Conventional Example 1.

FIG. 8 is a front explanatory view of an accumulation conveyor of Conventional Example 2.

[Explanation of symbols]

 1 jack stand 2 pedestal 3 frame 4 roller 5 drive stand 6 motor with reduction gear 7 drive pulley 8 transmission belt 9 end pulley 10 return pulley 11 belt frame 12 rail 13 cylinder support 14 air cylinder 15 roller frame 16 roller 17 long hole 18 Frame rotation stop pin 19 Stopper 20 Sensor 21 Work 22 Roll support roller

Claims (3)

[Claims] 1. An accumulation conveyor characterized in that a freely rotating roller is interposed between a roller for conveying a work and an endless belt which is endlessly rotated by a motor so as to be freely detachable. 2. A plurality of rollers that freely rotate by a cylinder device are interposed between a plurality of rollers that convey a work and an endless belt that rotates endlessly by a motor so that the rollers can rotate freely. Accumulation conveyor characterized by having done. 3. A plurality of freely rotating rollers are horizontally moved by one cylinder device, and a plurality of rollers for conveying a work and an endless belt which is endlessly rotated by a motor are interposed between the rollers so as to be freely detachable. , An accumulator characterized by a plurality of rotatable rollers.