JPH08157038A - Method for detecting shift amount of transport belt for vacuum suction and belt type vacuum suction transport apparatus - Google Patents

Abstract

PURPOSE: To accurately detect the actual shift amount of a belt irrespective of the presence of slippage between the belt for sucking and transporting a plate-like workpiece and a driven wheel and the size of the slippage amount. CONSTITUTION: A slippage amount in the transport direction between a vacuum suction transporting endless belt 6 trained over a drive wheel 1 and driven wheel 3 to suck and transport a plate-like workpiece W in the horizontal direction and a driven wheel 3 is calculated from a difference between the detected rotational frequency of the driven wheel and the rotational frequency of the drive wheel 1, and the actual shift amount of the transporting belt 6 is calculated by assuming the calculated slippage amount as a correction value for the shift amount of the transporting endless belt 6 obtained from the detected rotational frequency of the driven wheel 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is frequently used in a factory for producing building materials such as roofing materials such as color vests or wall materials. The present invention relates to a method for detecting the amount of movement of a vacuum suction transfer belt, which is designed to transfer and open a plate-shaped work by dropping it in the middle of its transfer path, and a belt-type vacuum suction transfer device.

[0002]

2. Description of the Related Art For example, in a manufacturing process of a roof material as an example of a plate-shaped work, a roof material supplied in the form of a soft green plate is conveyed, dropped at a predetermined position during the conveyance, and is orthogonal to the conveyance direction. A belt-type vacuum suction transfer device is used as a transfer device for transferring to another transfer device below.

In this type of belt type vacuum suction transfer device,
The roof material that is sequentially supplied is adsorbed to the endless belt for vacuum adsorption and transfer that is hung between the drive wheel and the driven wheel and the suction force is applied by the vacuum adsorption box, and conveyed in the horizontal direction. By switching the suction / release switching rotary damper provided at a predetermined position to an open state by an air type actuator such as an air motor or an air cylinder, the roof material is released from the transport belt by suction and is transferred onto another transport device. It is configured to drop.

By the way, conventionally, as a means for detecting that the roof material attracted and conveyed by the vacuum suction conveying endless belt has reached a predetermined drop position in the conveying direction,
A means to install a sensor to detect the passage of roofing material on the side of the transport route and the rotary encoder to detect the number of rotations of the driven shaft, and the number of detected pulses sets the distance from the adsorption position of the roofing material to the predetermined drop position. A means for determining whether or not the number of pulses corresponds to the value has been known.

[0005]

However, when the moving amount (position) detecting means of the plate-like work such as the roof material by the conventional vacuum suction transfer belt as described above is used, the endless transfer belt and the driven wheel are not used. If slippage occurs in the conveyance direction between the positions, the drop positions will vary. In particular, the slip amount changes due to a change in the number of plate-like workpieces sucked by the above-mentioned transport endless belt, a change in vacuum pressure in the suction box, or a change in tension and speed of the endless belt for transport, meandering, etc. If the slip amount changes in this way, the drop position of the plate-like work will vary greatly, and as a result, the plate-like work will be placed on another transport device for carrying out the dropped plate-like work to the loading process. The work cannot be transferred accurately and stably, causing a lot of loss in the plate-shaped work product.
Even if you can transfer, if you can not align well on another transfer device, it will fail in the later loading process and the loss rate will increase. There is a problem that it has a great adverse effect on the processing.

The present invention has been made in view of the above circumstances, and it is possible to detect the amount of movement of the endless belt for suction conveyance regardless of the occurrence of slip between the driven wheel and the change in the amount of slip. Provided is a belt-type vacuum suction / conveyance device capable of reliably and satisfactorily performing post-process processing such as unloading to a loading process by improving a method of detecting a movement amount of a conveyance belt and accuracy of a plate-shaped work falling position. The purpose is to

[0007]

In order to achieve the above object, the method for detecting the movement amount of a vacuum suction conveyance belt according to the invention of claim 1 is hung between a drive wheel and a driven wheel. While the plate-like work is adsorbed to the vacuum suction transfer endless belt and conveyed in the horizontal direction, the rotation speed of the driven wheel is detected, and the difference between the detected rotation speed and the rotation speed of the drive wheel causes A slip amount in the transport direction between the transport endless belt and the transport endless belt is calculated, and the transport belt is used as a correction value of the moving amount of the transport endless belt obtained from the detected rotation speed of the driven wheel. It is characterized in that the actual movement amount of is calculated.

Further, the belt type vacuum suction transfer apparatus according to the invention of claim 2 is hung over between the drive wheel and the driven wheel, and vacuum suction transfer for adsorbing the plate-like work and transferring it in the horizontal direction. Endless belt, a suction / release switching means arranged at a predetermined position in the conveying direction by the endless belt to open the suction state of the plate-like work, and a rotation speed detecting means for detecting the rotation speed of the driven wheel. From the difference between the rotational speed of the driven wheel detected by the rotational speed detecting means and the rotational speed of the drive wheel, the slip amount in the transport direction between the driven wheel and the endless belt for transport is calculated, and the calculated slip is calculated. A belt movement amount calculation means for calculating the actual movement amount of the conveyor belt as a correction value for the movement amount of the conveyor endless belt obtained from the detected rotational speed of the driven wheel, and the belt movement amount calculation means. Done When the actual amount of movement of the conveyor belt is consistent with a predetermined amount of movement, in which and a control means for automatically switching to the open state the suction / release switching means.

Further, the belt type vacuum suction transfer apparatus according to the third aspect of the present invention is hung over between the drive wheel and the driven wheel, and vacuum suction transfer for adsorbing the plate-like work and transferring it horizontally. Endless belt, a suction / release switching means arranged at a predetermined position in the conveying direction by the endless belt to open the suction state of the plate-like work, and the endless belt for conveyance is rotatably contacted with the pressing force to adjust the pressing force. A touch roll with a built-in rotary encoder that detects the actual movement amount of the belt, and when the actual movement amount of the belt detected by this touch roll matches a predetermined movement amount, the adsorption / release switching means is automatically switched to the open state. And a control means for controlling.

[0010]

According to the first aspect of the present invention, the rotational speed of the driven wheel on which the endless belt for vacuum adsorbing and conveying the plate-like work is adsorbed and horizontally conveyed is detected, and the detected rotational speed is known. The amount of slippage between the conveyor belt and the driven wheel calculated from the difference between the rotational speed of the drive wheel and the actual amount of movement of the conveyor belt as a correction value for the amount of belt movement obtained from the detected rotational speed of the driven wheel. Therefore, the actual movement amount of the belt can be accurately detected regardless of how the slip amount changes due to various conditions such as a change in the number of suctioned plate-like works.

According to the second aspect of the present invention, when the actual movement amount of the belt accurately detected as described above matches the predetermined movement amount, the suction / release of the plate-like work is released. By automatically controlling the opening switching means to open, the plate-like work sucked and conveyed by the belt can be reliably dropped at a predetermined position.

Further, according to the third aspect of the invention, since the amount of movement of the belt is detected by the rotation of the touch roll that directly contacts the belt, the presence or absence of slip between the driven wheel and the belt can be detected. Regardless of size, it is possible to accurately detect the actual movement amount of the belt. Therefore, when the actual movement amount of the belt matches a predetermined movement amount, the adsorption / release switching means is automatically opened. By the switching control, the plate-like work sucked and conveyed by the belt can be surely dropped at a predetermined position.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a belt-type vacuum adsorption / conveyance apparatus to which the method for detecting the movement amount of a vacuum adsorption conveyance belt according to the present invention is applied. In FIG. 1, 1 is a drive wheel driven by a motor 2, 3 Is a driven wheel which is arranged horizontally at a predetermined interval with respect to the drive wheel 1. Between the drive wheel 1 and the driven wheel 3, a large number of small holes (not shown) are provided as suction means. , A plurality of vacuum suction boxes 5 whose lower wall portion is configured by the iron plate 4 having the above are arranged in series.

Reference numeral 6 is an endless belt for vacuum suction and conveyance, in which a large number of suction holes 7 (FIG. 2) are formed in the entire area and a suction force is applied by the vacuum suction box 5 ..., The driving wheel 1 and the driven wheel 3 It is hung between and. The endless belt 6 for conveyance adsorbs a plate-like work supplied from the work supply device 8, for example, a soft raw plate-like roofing material W, and conveys it in the horizontal direction (direction of arrow a). The drive wheel 1, the driven wheel 3, and the like constitute the transport main body 9. A work detection sensor 10 detects that the roofing material W supplied from the work supply device 8 has reached a predetermined suction position.

Below the carrier body 9, at a plurality of positions spaced by a predetermined distance in the carrying direction, the roofing material W is orthogonal to the carrying direction, that is, in the front-back direction (direction of arrow b in FIG. 2). Different transport devices 11 for transporting are respectively provided.

Denoted at 12 are rotary dampers arranged at a plurality of positions in the carrying direction as suction / open switching means, and each rotary damper 12 has a communicating portion 12a for the vacuum suction box 5 and a vacuum pump (not shown) or the like. Port 12b connected to the suction device
And an atmosphere opening port 12c, and a rotary valve body 12d for selectively communicating the communication portion 12a with the suction port 12b and the atmosphere opening port 12c.
Is driven by air pressure to selectively switch between the suction state in which the communication portion 12a communicates with the suction port 12b and the suction release state in which the communication portion 12a communicates with the atmosphere opening port 12c. The other vacuum suction box 5 not connected to the rotary damper 12 is always connected to the suction device such as the vacuum pump via the suction pipe 5a in a suction state.

Reference numeral 13 denotes a rotary encoder for detecting the number of rotations of the driven wheel 3 to generate a pulse, and 14 for counting the number of pulses from the rotary encoder 13 for conveying the endless belt 6 and the roof material adsorbed on the endless belt 6. It is a controller that calculates the movement amount (distance) of W. The controller 14 uses the difference between the rotational speed (known value) of the motor 2 which is the rotational speed of the drive wheel 1 and the rotational speed of the driven wheel 3 by the rotary encoder 13 to determine the endless belt 6 for conveyance and the driven wheel 3. The slip amount in the transport direction between the two is calculated, and the calculated slip amount is calculated by the rotary encoder 1.
3 is stored as a table as correction data of the movement amount of the endless belt 6 for conveyance, and a belt movement amount calculation function for calculating the actual movement amount of the endless belt 6 for conveyance by this table, and the calculated value. It is configured to exert a control function of automatically switching the rotary damper 12 to the open state when the actual movement amount of the endless belt for conveyance 6 matches a predetermined movement amount.

Next, the operation of the above configuration will be described. By rotating the drive wheel 1 via the motor 2, the operation of the endless belt 6 for conveyance is started. At this time, the controller 14 switches each valve element 12d of the rotary damper 12 to the suction state shown by the solid line in FIG. 1 via each servo motor 13, and the suction port 12b of each rotary damper 12 passes through the communicating portion 12a. Since it is communicated with the vacuum suction box 5, the inside of the vacuum suction box 5 is depressurized to a substantially vacuum state. The other vacuum suction box 5 is constantly sucked and kept under reduced pressure in a substantially vacuum state. As a result, a vacuum suction force is applied to the endless belt 6 for vacuum suction and conveyance.

While the work detection sensor 10 detects that the roof material W conveyed by the work supply device 8 has reached a predetermined suction position, the roof material W is suction-held by the vacuum suction transport endless belt 6. , And is transferred in the direction of arrow a. Then, at the same time as the suction and conveyance of the roofing material W by the endless belt 6 for conveyance is started, the rotary encoder 13 starts to detect the rotational speed of the driven wheel 3, and a pulse corresponding to the rotational speed of the driven wheel 3 is generated.

The controller 14 determines from the work detection signal from the work detection sensor 10 that the roofing material W has been adsorbed and held on the conveyor belt 6, and from this point of time, the number of pulses is counted and While the rotational speed of the driving wheel 3 is detected, the rotational speed of the drive wheel 1 is obtained from the rotational speed of the motor 2, and the slip in the transport direction between the endless belt for transport 6 and the driven wheel 3 is calculated from the difference between these rotational speeds. In addition to calculating the amount, the correction data is read from the table held in the controller 14 in accordance with the calculated slip amount, the actual movement amount of the endless belt 6 for conveyance is calculated, and the calculated actual movement is performed. When the amount matches the predetermined movement amount, it is determined that the roofing material W has reached a predetermined position in the conveyance direction, and the valve element 12d in each rotary damper 12 is determined by air pressure. It is switching operation in the open state shown by a chain line in FIG. 1. By this operation, the rotary damper 1
2 communicating part 12a communicates with the atmosphere opening port 12c,
The vacuum suction box 5 at a predetermined position is opened to the atmosphere. For this reason, the suction force of the transporting endless belt 6 on the roof material W disappears, so that the roof material W is released from the suction at a predetermined position and separated from the transport belt 6 to be placed on another transport device 11. To fall.

As described above, the slip amount in the transport direction between the transport endless belt 6 and the driven wheel 3 is calculated as a correction value for the amount of movement of the transport endless belt 6, and the actual value of the transport endless belt 6 is calculated. By calculating the amount of movement, the roofing material W can be reliably and accurately separated at a predetermined position regardless of the presence or absence of a slip in the carrying direction between the carrying endless belt 6 and the driven wheels 3 and the magnitude of the slip. Therefore, it is possible to drop the post-process such as unloading to the loading process without providing an auxiliary device such as an alignment device in the transfer route of another transfer device 11. It can be done without.

FIG. 3 is a side view of the essential part of another embodiment of the present invention. In FIG. 3, reference numeral 31 is a touch roll incorporating a rotary encoder (not shown). The endless belt 6 is elastically rolled on the surface of the endless belt 6 via a coil spring 32. By adjusting the spring force of the coil spring 32, the pressing force against the endless belt 6 can be adjusted, and the endless belt 6 can be mounted. A detection mechanism 33 that detects the amount of movement is configured. When the actual movement amount detected by the actual movement amount detection mechanism 33 matches a predetermined movement amount, the rotary damper 12 is automatically switched to the open state, as in the above embodiment.

In the belt type vacuum suction transporting device having the structure as shown in FIG. 3, the actual movement amount of the transporting endless belt 6 can be directly detected by the touch roll 31, and therefore, as in the above embodiment. Similarly to the case where the slip amount is calculated and the actual movement amount is calculated by using the slip amount as a correction value, the presence or absence of the slip in the carrying direction between the endless belt for carrying 6 and the driven wheel 3 and the slip amount thereof. Regardless of the size of the above, it is possible to surely and accurately drop the roofing material W at a predetermined position onto another transfer device 11, and
The controller 14 has a small number of functions, which simplifies the configuration and also increases the detection accuracy of a predetermined belt movement amount.

In the above embodiment, the case where the green plate-shaped roof material W is conveyed as the plate-shaped work has been described, but the same applies not only to the case of the roof material W but also to other plate-shaped works. The effect of.

[0025]

As described above, according to the first aspect of the present invention, the rotational speed of the driven wheel and the known drive speed of the endless belt for vacuum suction and conveyance for adsorbing and conveying the plate-like work in the horizontal direction are known. The actual amount of movement of the conveyor belt is calculated as the amount of slip between the conveyor belt and the driven wheel, which is calculated from the difference between the number of rotations of the wheel, and the correction value for the amount of movement of the belt, which is obtained from the detected rotation speed of the driven wheel. Since the calculation is performed, the actual movement amount of the belt can be accurately detected regardless of how the slip amount changes due to changes in various conditions such as the change in the number of suctioned plate-like works.

According to the second aspect of the invention, when the actual movement amount of the belt accurately detected as described above matches the predetermined movement amount, the suction / release of the plate-like work is released. By automatically controlling the opening switching means to open, the plate-like work sucked and conveyed by the belt can be reliably dropped at a predetermined position. That is, regardless of the presence or absence of slippage and the amount of slippage, it is possible to significantly improve the accuracy of drop positioning of plate-shaped workpieces. The post-process such as carrying out to the process can be reliably and satisfactorily performed without loss.

Further, according to the third aspect of the present invention, since the amount of movement of the belt is detected by the rotation of the touch roll which directly contacts the belt, the presence or absence of slippage between the driven wheel and the belt and the amount of slippage thereof can be detected. Regardless of size, it is possible to accurately detect the actual movement amount of the belt, and it is possible to surely drop the plate-like work sucked and conveyed by the belt at a predetermined position. It can be simplified.

[Brief description of drawings]

FIG. 1 is a side view showing a belt type vacuum adsorption / conveyance apparatus to which a method for detecting a movement amount of a vacuum adsorption conveyance belt according to the present invention is applied, with a part thereof being cut away.

FIG. 2 is a plan view showing a transporting endless belt of the belt type vacuum suction transporting device according to the embodiment.

FIG. 3 is a side view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 1 Drive Wheel 3 Driven Wheel 6 Vacuum Adsorption Transfer Belt 12 Adsorption / Opening Switching Rotary Damper 13 Rotary Encoder 14 Controller 31 Touch Roll W Work

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Isotaro Aoki 1-247 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka Kubota Corporation

Claims (3)

[Claims] 1. A plate-like work is adsorbed by an endless belt for vacuum adsorbing and conveying which is hung between a driving wheel and a driven wheel to convey the plate-like work in a horizontal direction, and the number of rotations of the driven wheel is detected. , The slip amount in the transport direction between the driven wheel and the endless belt for transport is calculated from the difference between the detected rotation speed and the rotation speed of the drive wheel, and the calculated slip amount is the detected rotation speed of the driven wheel. A method for detecting the amount of movement of the vacuum suction conveyor belt, wherein the actual amount of movement of the conveyor belt is calculated as a correction value for the amount of movement of the conveyor endless belt. 2. An endless belt for vacuum adsorption and conveyance, which is hung between a driving wheel and a driven wheel and adsorbs a plate-like work and conveys it in a horizontal direction, and a predetermined position in the conveyance direction by the endless belt. Adsorption / release switching means arranged to release the adsorption state of the plate-like work, rotation speed detection means for detecting the rotation speed of the driven wheel, and rotation speed detected by the rotation speed detection means and the drive. The slip amount in the transport direction between the driven wheel and the endless belt for transport is calculated from the difference between the rotational speeds of the wheels, and the calculated slip amount is determined from the detected rotational speed of the driven wheel. Belt movement amount calculation means for calculating the actual movement amount of the conveyor belt as a correction value of the movement amount of the endless belt, and the actual movement amount of the conveyance belt calculated by the belt movement amount calculation means becomes a predetermined movement amount. When they match, A belt-type vacuum suction conveyance device comprising: a control means for automatically switching the suction / release switching means to an open state. 3. An endless belt for vacuum adsorption and conveyance, which is hung between a driving wheel and a driven wheel and which adsorbs a plate-like work and conveys it in a horizontal direction, and a predetermined position in the conveyance direction by the endless belt. A suction / release switching means that is arranged to release the suction state of the plate-like work; and a touch roll with a built-in rotary encoder that is roll-contacted to the above-mentioned endless belt for conveyance to adjust the pressing force and detects the actual movement amount of the belt. A belt type, characterized by further comprising: control means for automatically switching the suction / release switching means to an open state when the actual movement amount of the belt detected by the touch roll matches a predetermined movement amount. Vacuum suction transfer device.