JP2011026105A - Conveyance apparatus for strip and method for controlling conveyance - Google Patents

Abstract

A belt-shaped material transport device and a transport control method capable of stably transporting a belt-shaped material by accurately detecting each roll diameter of an unwinding roll and a winding roll.
In a transport device 1 for a web 9, while the acceleration of each roll 10 and 30 is being decelerated, the speed control circuits 19 and 39 use the non-contact type diameter measuring sensors 13 and 33 to measure the measured value rmea. The motors 12 and 32 are used to control each of the motors in the steady speed range in which the web 9 is conveyed at the target speed, using the operation diameter rcal based on the rotation pulse signal detected by the encoders 15 and 35. 12 and 32 are controlled.
[Selection] Figure 4

Description

  The present invention relates to a transport device and a transport control method for transporting a strip-shaped material such as a metal strip or a web. More specifically, the present invention relates to a transport apparatus and a transport control method that can stably transport the strip material while suppressing fluctuations in the transport speed of the strip material.

  A strip-shaped material such as a metal strip or a web is conveyed between both rolls by being wound around the winding roll while being fed out from the winding roll. And in the case of the conveyance, various processing processes are implemented with respect to a strip | belt-shaped material. For example, in the manufacturing process of a lithium ion secondary battery, when transporting between both rolls, a paste of an electrode material is applied to a copper foil or an aluminum foil to manufacture a strip-shaped electrode material, or the strip-shaped A process of cutting the electrode material into a predetermined width is performed.

  In the conveyance of such a belt-shaped material, it is necessary to synchronize the unwinding roll and the winding roll, and to drive the belt-shaped material by rotating both rolls at the same speed. This is because if the transport speed fluctuates, the tension of the strip material between the two rolls fluctuates, so that various processes cannot be performed accurately, and the quality of the product may be impaired.

  Therefore, in transporting the strip material, the roll diameter of the unwinding roll and the take-up roll is calculated, and the rotation speed of each roll is controlled using the calculated roll diameter, thereby stabilizing the transport of the strip material. I am letting. For example, in the technique described in Patent Document 1, the roll diameter of the unwinding roll is calculated, and the rotational speed of the unwinding roll is corrected based on the calculated roll diameter. Thereby, the speed balance of the unwinding roll and the winding roll can be made appropriate and stable.

  Here, the calculation of the roll diameter is basically performed based on the rotation pulse signal. However, as described in Patent Document 2, the roll diameter calculation means (method) according to the rotation speed of the roll. ) Is also available. That is, in the technique described in Patent Document 2, the roll diameter is calculated based on the rotation pulse signal on the low speed side, and the roll diameter is calculated by measuring the pulse oscillation frequency on the high speed side. The diameter can be calculated.

  Note that speed control at the start of driving of each roll is performed by measuring each roll diameter in advance before conveyance and using the measured roll diameter. Then, generally, as described above, each roll diameter is calculated using a rotation pulse signal or the like, and the speed control of each roll is generally performed using the calculated roll diameter.

Japanese Patent Application No. 8-282893 Japanese Patent No. 3221523

  However, in the above-described conventional technology, there are cases where the roll diameters of the unwinding roll and the winding roll cannot be detected with high accuracy. In such a case, the speed control cannot be performed with high accuracy, and the belt-like material cannot be used. There was a problem that it could not be transported stably. Because the inertia of each roll is different, the acceleration rate or deceleration rate at the time of acceleration or deceleration of each roll is different. For this reason, each roll is affected by speed fluctuations due to acceleration or deceleration, and a detection error such as a rotation pulse signal becomes large, and the calculation accuracy of each roll diameter decreases (see FIG. 7).

Here, a case where the calculation accuracy of the roll diameter is lowered will be specifically described by taking an unwinding roll as an example. The conveying speed (line speed) of the belt-like material is V, the diameter of the unwinding roll with high accuracy is r1, the angular speed with respect to this diameter is ω1, the diameter of the unwinding roll with poor accuracy is r′1, and the angular speed with respect to this diameter is ω ′. If 1, the angular velocity ω′1 is
ω′1 = V / r′1
It becomes. The actual speed (feeding speed) V′1 of the unwinding roll at this time is
V′1 = r1 × ω′1
It becomes. Here, when the accuracy deterioration of the diameter in the unwinding roll with poor accuracy is e,
r′1 = r1 + e
The angular velocity ω′1 is
ω′1 = V / r′1 = V / (r1 + e)
It becomes. Therefore, the actual speed V′1 of the unwinding roll is
V′1 = r1 × ω′1 = (r1 / (r1 + e)) × V
Thus, the speed control of the unwinding roll is performed with a value different from the line speed V of the belt-like material. Thus, unless the roll diameter is accurately detected, the belt-like material cannot be stably conveyed.

  Then, this invention is made | formed in order to solve an above-described problem, By detecting each roll diameter of an unwinding roll and a winding roll accurately, a strip | belt-shaped material can be conveyed stably. It is an object of the present invention to provide a belt-shaped material conveyance device and a conveyance control method.

  One aspect of the present invention made in order to solve the above-described problem is that the belt-shaped material is transported to a winding roll that winds the belt-shaped material that is fed from a winding roll on which the belt-shaped material is wound. In the apparatus, the belt-shaped material is disposed between the winding roll driving motor that drives the winding roll, the winding roll driving motor that drives the winding roll, and the winding roll and the winding roll. A master roll driving motor for driving the line master roll, a winding roll sensor connected to the winding roll and the line master roll, and a winding roll rotation sensor. And a master roll rotation sensor, a non-contact unwinding diameter measuring sensor and a winding diameter measuring sensor for measuring the diameter of the unwinding roll and the winding roll, and a counter. The diameters of the unwinding roll and the unwinding roll are calculated based on the rotation pulse signals of the unwinding roll sensor and the master roll rotation sensor, and the winding roll rotation sensor and the master roll rotation sensor. And an unwinding roll diameter detecting circuit and a winding roll diameter detecting circuit for measuring the unwinding roll and the diameter of the winding roll by the unwinding diameter measuring sensor and the unwinding diameter measuring sensor, and the master roll rotation sensor. The rotation pulse signal is input via a counter, and the conveyance speed calculation circuit for calculating the conveyance speed of the strip material based on the input value, and the drive of the unwinding roll driving motor and the winding roll driving motor are controlled. An unwinding roll drive motor control circuit and a unwinding roll drive motor control circuit, and the unwinding roll drive motor control circuit and the unwinding roll In the acceleration region where the transport speed of the strip material calculated by the transport speed calculation circuit is increasing, or in the deceleration region where the transport speed of the strip material is decreasing, the unwinding roll Using the measured diameters of the unwinding roll and the winding roll by the diameter measuring sensors respectively acquired by the diameter detecting circuit and the winding roll diameter detecting circuit, the unwinding roll driving motor and the winding roll driving motor In the steady speed range in which the driving speed is controlled and the belt-shaped material transport speed calculated by the transport speed calculation circuit is the target speed, the unwinding roll diameter detection circuit and the winding roll diameter detection circuit respectively Using the calculated diameters of the unwinding roll and the winding roll calculated based on the rotation pulse signal, the unwinding roll drive motor and the winding roll drive motor are driven respectively. It is characterized by being controlled.

  In this belt-shaped material conveyance device, the drive of the unwinding roll drive motor is controlled by the unwinding roll drive motor control circuit to control the rotational speed of the unwinding roll. Further, the take-up roll drive motor control circuit controls the drive of the take-up roll drive motor to control the rotation speed of the take-up roll. The diameter of each roll is used for controlling the rotation speed of each roll. Specifically, the roll diameter used for controlling each drive motor is the calculated diameter of each roll calculated from the rotation pulse signal of each drive motor, or the measured diameter of each roll measured by a diameter measuring sensor.

Here, at the time of acceleration or deceleration of each roll, since the inertia of each roll is different, the acceleration rate or deceleration rate of each roll is different. Therefore, each roll is affected by the speed fluctuation due to acceleration or deceleration, and the detection error of the rotation pulse signal becomes large, and the calculation accuracy of each roll diameter is lowered.
Therefore, in this belt-shaped material conveyance device, when the belt-shaped material conveyance speed calculated by the conveyance speed calculation circuit is in the acceleration region or the deceleration region by the unwinding roll drive motor control circuit and the winding roll drive motor control circuit, The measured diameters of the unwinding roll and the unwinding roll by the diameter measuring sensors respectively acquired by the unwinding roll diameter detecting circuit and the winding roll diameter detecting circuit are used to drive the unwinding roll driving motor and the winding roll driving motor. Are controlled respectively. And when the conveyance speed of the strip | belt shaped material calculated in a conveyance speed calculating circuit exists in a steady speed (target speed) area, each was calculated based on the rotation pulse signal in the unwinding roll diameter detection circuit and the winding roll diameter detection circuit. The calculated diameters of the unwinding roll and the unwinding roll are used to control the driving of the unwinding roll drive motor and the take-up roll drive motor, respectively.

  That is, during acceleration or deceleration, the measured value (measured diameter of each roll) by the non-contact type sensor is used for controlling each drive motor, and in the steady speed range, the measured value by the contact type sensor (rotation sensor) ( The calculated diameter of each roll) is used to control each drive motor. Thereby, each roll diameter can be accurately detected even in the acceleration region or the deceleration region of each roll. Therefore, the belt-like material can be stably conveyed. As a result, various processes performed during the conveyance of the belt-like material can be performed with good control, and the product quality is also stabilized.

  In addition, since the measured value (measured diameter of each roll) by the non-contact type sensor is affected by the shake of the roll and noise, the averaging process is performed to reduce or eliminate the influence, and the averaging process What is necessary is just to use the measured diameter of each subsequent roll for control of each drive motor.

  In the above-described belt-shaped material conveyance device, each roll diameter used for drive control of each motor in the unwinding roll drive motor control circuit and the take-up roll drive motor control circuit is used for the previous drive control. It is desirable to have a shockless circuit that smoothly changes by averaging the roll diameter and the roll diameter used for the current drive control.

  When each roll diameter used for controlling each drive motor is switched from the measured diameter to the calculated diameter, or from the calculated diameter to the measured diameter, each roll diameter may change abruptly. And if each roll diameter changes abruptly at the time of switching, a fluctuation | variation will arise in the rotational speed of each roll with the change of the roll diameter, and a strip | belt-shaped material cannot be conveyed stably.

Therefore, in this belt-shaped material conveyance device, each motor is obtained by performing an averaging process on the roll diameter used for the previous drive control and the roll diameter used for the current drive control (calculating moving average values sequentially). A shockless circuit is provided for smoothly changing the diameter of each roll used for the drive control. As a result, each roll diameter used for controlling each drive motor changes rapidly when each roll diameter used for controlling each drive motor is switched from the measured diameter to the calculated diameter or from the calculated diameter to the measured diameter. Can be prevented. Therefore, even when the rotation speed of each roll shifts from the acceleration region to the steady region, or when the rotation speed shifts from the steady region to the deceleration region, the belt-like material can be stably conveyed. In addition, what is necessary is just to set the number of data of the roll diameter used for an averaging process to about 100-300 pieces. Thereby, a rapid change of each roll diameter can be reliably prevented without causing a decrease in the processing speed.

  In the above-described belt-shaped material conveyance device, the unwinding roll drive motor control circuit controls the unwinding roll diameter used for driving control of the unwinding roll drive motor by the unwinding roll drive motor control circuit. When the unwinding roll diameter used in the above is equal to or larger than the unwinding roll diameter used in the previous drive control, the unwinding roll diameter used in the previous drive control is set, and the winding roll drive motor control circuit If the winding roll diameter used for the drive control of the winding roll drive motor is equal to or smaller than the winding roll diameter used for the previous drive control, the previous drive control is used. It is desirable to have a roll diameter determining means for making the winding roll diameter used in the above.

  During conveyance of the belt-shaped material, the roll diameter of the unwinding roll gradually decreases, and the roll diameter of the winding roll gradually increases. Here, as the roll diameter used for controlling each drive motor, since the detection values by two types of sensors are used, the roll diameter larger than the roll diameter obtained last time by the unwinding roll diameter detection circuit due to the influence of noise or the like. May be acquired, or a roll diameter smaller than the roll diameter previously acquired by the winding roll diameter detection circuit may be acquired. In such a case, if the roll diameter acquired by each diameter detection circuit is used as it is for the control of each drive motor, the rotation speed of each roll fluctuates and the belt-like material cannot be stably conveyed.

  In view of this, in this belt-shaped material conveying device, as described above, there is provided roll diameter determining means for finally determining each roll diameter used for control of each drive motor under a certain regulation condition. As a result, the unwinding roll diameter used for driving control of the unwinding roll drive motor becomes larger than the previous value, and the winding roll diameter used for drive control of the winding roll drive motor becomes smaller than the previous value. It can be surely prevented. Therefore, the belt-like material can be transported very stably without fluctuations in the rotation speed of each roll.

  In the above-described belt-shaped material conveyance device, the unwinding roll drive motor control circuit and the unwinding roll drive motor control circuit are configured such that the calculated diameter of the unwinding roll calculated by the unwinding roll diameter detection circuit is a predetermined threshold value. In the following cases, it is desirable to decelerate and stop the motors.

  By doing in this way, the yield of an unwinding roll can be improved, ie, the residual amount of the strip | belt-shaped material wound by the unwinding roll can be decreased. In addition, what is necessary is just to determine a threshold value from the roll diameter and the required stop distance to leave to a winding roll, and a required stop distance can be calculated | required from the conveyance speed of a strip-shaped material, and the deceleration time of each roll.

  Alternatively, in the above-described belt-shaped material conveyance device, the unwinding roll drive motor control circuit and the winding roll drive motor control circuit include a calculation diameter of the unwinding roll calculated by the unwinding roll diameter detection circuit, and The motors may be decelerated and stopped when the remaining amount of the strip-shaped material of the unwinding roll calculated based on the core diameter of the unwinding roll and the thickness of the strip-shaped material is equal to or less than a predetermined amount.

  By doing in this way, until the strip-like material remaining amount of the unwinding roll reaches the required stop distance, that is, until the strip-like material remaining amount of the unwinding roll is about to disappear, the strip-like material can be fed out from the unwinding roll, The yield of the unwinding roll can be further improved. That is, the remaining amount of the belt-shaped material wound around the unwinding roll can be further reduced. In addition, what is necessary is just to determine a predetermined value from a required stop distance, and a required stop distance can be calculated | required from the conveyance speed of a strip | belt-shaped material, and the deceleration time of each roll.

  And in the above-mentioned strip | belt-shaped material conveyance apparatus, it is preferable that the said strip | belt-shaped material is an electrode raw material of a battery, and the said line master roll is a press roll which presses the said electrode raw material.

  By applying the belt-shaped material transport device to the battery manufacturing process in this way, it is possible to stably transport an electrode material that is a belt-shaped material (for example, a metal foil or a foil coated with a paste). As a result, in the process of coating the electrode material paste on copper foil or aluminum foil to produce a strip-shaped electrode material, and in the process of cutting the strip-shaped electrode material into a predetermined width (multiple strips), the production efficiency is improved. It can be improved and the quality of the product can be stabilized.

  Another aspect of the present invention made in order to solve the above-described problem is that the belt-shaped material is wound via a line master roll that transports and travels the belt-shaped material fed from the unwinding roll on which the belt-shaped material is wound. In the transport control method for transporting the strip material to the take-up roll to be taken, each of the diameters of the unwind roll and the unwind roll is calculated based on each rotation pulse signal of each motor that drives each roll, The measured values of the diameters of the unwinding roll and the winding roll are obtained from a non-contact type diameter measuring sensor, respectively, and an acceleration region in which the transport speed of the strip material is increasing or the transport speed of the strip material is decreased. In the decelerating region, the measured diameters of the unwinding roll and the unwinding roll acquired from the diameter measuring sensor are used to control the driving of each motor that drives the unwinding roll and the winding roll. In the steady speed range where the transport speed of the belt-like material is the target speed, the unwinding roll and the winding roll are calculated using the calculated diameters of the unwinding roll and the unwinding roll based on the rotation pulse signal. Controlling the drive of each motor that drives the roll is characterized.

  According to such a belt-like material conveyance control method, each roll diameter used for drive control of each motor can be detected with high accuracy, as in the case of the above-described conveyance device. Can be accurately controlled, and the belt-like material can be stably conveyed.

  In the above-described belt material transport control method, the roll diameters used for the drive control of the motors are averaged by the roll diameter used for the previous drive control and the roll diameter used for the current drive control. It is desirable to change smoothly by performing processing.

  In the above-described belt material transport control method, the unwinding roll diameter used for the drive control of the unwinding roll drive motor is the same as the unwinding roll diameter used for the previous drive control. If it is equal to or larger than the unwinding roll diameter, the unwinding roll diameter used for the previous drive control and the winding roll diameter used for the drive control of the winding roll drive motor are used for the current drive control. When the take-up roll diameter is equal to or smaller than the take-up roll diameter used for the previous drive control, it is desirable to use the take-up roll diameter used for the previous drive control.

  By doing in this way, the roll diameter used for drive control of each motor can be detected with higher accuracy in the same manner as the above-described transport device, so that the belt-shaped material can be transported more stably.

  Furthermore, in the above-described belt-shaped material conveyance control method, it is preferable that the motors are decelerated and stopped when the calculated diameter of the unwinding roll becomes a predetermined threshold value or less.

  Alternatively, in the belt material transport control method described above, the strip material remaining amount of the unwinding roll calculated based on the calculated diameter of the unwinding roll, the core diameter of the unwinding roll, and the thickness of the strip material. Each of the motors may be decelerated and stopped when becomes less than a predetermined amount.

  By doing in this way, the yield of an unwinding roll can be improved more similarly to the above-mentioned conveyance apparatus. That is, the remaining amount of the belt-shaped material wound around the unwinding roll can be further reduced.

  According to the belt-shaped material conveyance device and the conveyance control method of the present invention, as described above, each roll diameter of the unwinding roll and the winding roll can be detected with high accuracy. The drive of the roll drive motor can be controlled with high accuracy, and the belt-like material can be stably conveyed.

It is process drawing which shows the content of the slitter process. It is a perspective view which shows typically a mode that the web is cut | disconnected by the slitter process. It is a perspective view which shows the outline of the web conveyance apparatus which concerns on this Embodiment. It is a block diagram which shows the control system of the web conveyance apparatus which concerns on this Embodiment. It is a flowchart which shows the content of the conveyance control of a web. It is a figure explaining the various diameters used in order to calculate the web remaining amount in a winding roll. It is a time chart which shows the mode of a change of various roll diameters. It is a time chart which shows the mode of the change of the conveyance speed of a web. It is a figure which shows another example of application of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment in which a belt-like material conveyance device and a conveyance control method of the present invention are embodied will be described in detail with reference to the drawings. In the present embodiment, an example in which the present invention is applied to a slitter process in a manufacturing process of an electrode material of a lithium ion secondary battery is illustrated. Accordingly, the slitter process will be briefly described with reference to FIGS. FIG. 1 is a process diagram showing the contents of the slitter process. FIG. 2 is a perspective view schematically showing a state in which the web is cut in the slitter process.

  As shown in FIG. 1, the slitter process 90 includes an unwinding process 91, a first slitter process 92, a reservoir process 93, a pressing process 94, a foil portion pressing process 95, a film thickness measuring process 96, a CPC unit process 97, a first process. A two slitter process 98, an ultrasonic cleaner process 99, an inspection process 100, and a winding process 101 are included. In such a slitter process 90, a strip-shaped electrode material (hereinafter also referred to as “web”) 9 in which a plurality of pastes are applied on a continuous foil is supplied as an unwinding roll wound in a roll shape. . Then, as shown in FIG. 2, the web 9 is cut into a plurality of strips and discharged as a plurality of strip web rolls. In the slitter process 90, the web 9 is conveyed from the unwinding process 91 to the winding process 101 by the web conveying apparatus 1 (see FIG. 3) described later. Although FIG. 2 illustrates a state in which the web 9 is cut into two strips, the web 9 can be cut into three or more strips in the slitter process. The web 9 in the present embodiment is a strip-shaped electrode material having a thickness of about 10 to 20 μm, a width of about 40 to 800 mm, and a length of about 3500 to 4000 m.

In the unwinding step 91, the web 9 in which a plurality of strips of paste are applied on the continuous foil is unwound from the unwinding roll 10 (see FIG. 3) and is transferred to the first slitter step 92 of the next step. Supply. In the first slitter step 92, the foil portions (between the paste application portions) where the paste is not applied are continuously cut to form a plurality of webs 9. In the reservoir step 93, the interval between the webs 9 cut into a plurality of strips is gradually increased.
In the pressing step 94, the applied paste is pressed to a uniform thickness. In the foil portion pressing step 95, the web 9 is prevented from being bent by pressing the foil portion that has not been pressed in the pressing step 94. In the film thickness measuring step 96, the thickness of the foil and paste is inspected. In the CPC unit process 97, the meandering of the plurality of webs 9 is corrected.
In the second slitting step 98, the plurality of strips cut in the first slitting step 92 are cut in half at the center position of the paste application portion, thereby dividing into a plurality of strip webs 9. That is, in the second slitter process 98, the web 9 is divided into twice the number of lines divided in the first slitter process 92. In the ultrasonic cleaner process 99, dust and the like are removed from the surface of the web 9 of multiple strips by ultrasonic waves. In the inspection process 100, the paste applied to the web 9 is inspected for defects. In the winding process 101, the web 9 divided into a plurality of strips is wound on a winding roll 30 (see FIG. 3).

  Next, the web conveyance device according to the present embodiment will be described with reference to FIGS. FIG. 3 is a perspective view schematically showing the appearance of the web conveyance device according to the present embodiment. FIG. 4 is a block diagram showing a control system of the web conveyance device according to the present embodiment.

  As shown in FIG. 3, the web conveyance device 1 is roughly divided into an unwinding unit 2 that sends out the web 9, a traveling unit 3 that conveys and travels the web 9 that is fed from the unwinding unit 2, and the traveling unit 3. It is divided into a winding unit 4 for winding the web 9 that has been conveyed. The unwinding section 2 corresponds to the unwinding process 91, the traveling section 3 corresponds to the pressing process 94 and the foil section pressing process 95, and the winding section 4 corresponds to the winding process 101.

  The unwinding unit 2 includes an unwinding roll 10 around which the web 9 is wound, a holding base 11 that rotatably holds the unwinding roll 10, and an unwinding that is fixed to the holding base 11 and rotates the unwinding roll 10. A motor 12 and a non-contact type diameter measuring sensor 13 that is fixed to the holding table 11 and measures the roll diameter of the unwinding roll 10 are provided. In the present embodiment, an ultrasonic sensor is used as the diameter measuring sensor 13. In the unwinding section 2, the unwinding motor 12 is driven to unwind the web 9 from the unwinding roll 10. The unwinding speed of the web 9 from the unwinding roll 10 is controlled by controlling the driving of the unwinding motor 12. Details of drive control of the unwind motor 12 will be described later.

  The traveling unit 3 includes a pair of press rolls 20 that press the web 9 and a motor 22 that rotates the press roll 20. In addition, the press roll 20 is comprised from the drive roll 20a with which the motor 22 was connected, and the driven roll 20b which is driven by the drive roll 20a and rotates. The press roll 20 is an example of the “line master roll” in the present invention. Then, the line speed of the web 9 conveyed by the press roll 20 becomes a reference conveying speed in the conveying device 1.

  In the winding unit 4, a winding roll 30 that winds the web 9 that has been conveyed, a holding base 31 that rotatably holds the winding roll 30, and a winding base 30 that is fixed to the holding base 31 and rotates. A winding motor 32 and a non-contact type diameter measuring sensor 33 that is fixed to the holding table 31 and measures the roll diameter of the winding roll 30 are provided. In the present embodiment, an ultrasonic sensor is used as the diameter measurement sensor 33. In the winding unit 4, the winding motor 32 is driven to wind the web 9 around the winding roll 30. And the winding speed of the web 9 to the winding roll 30 is controlled by controlling the drive of the winding motor 32. Details of drive control of the winding motor 32 will be described later.

  And in such a web conveyance apparatus 1, the drive of the unwinding motor 12 and the winding motor 32 is controlled, and the unwinding speed from the unwinding roll 10 of the web 9 and the unwinding speed to the winding roll 30 are set. The web 9 is always conveyed in a state in which a constant tension is applied to the web 9 by making it equal to the conveyance speed (line speed) of the web 9 in the traveling unit 3. The drive control of the unwinding motor 12 and the winding motor 32 is performed by a control system shown in FIG.

The control system includes encoders 15, 25, 35, amplifiers 16, 26, 36, pulse counters 17, 27, 37, unwinding diameter detection circuit 18, winding diameter detection circuit 38, and speed control circuit. 19, 39, a speed calculation circuit 29, a shockless circuit 40, an unwinding diameter / winding diameter determining unit 41, and a sequencer 42.
The encoders 15, 25, and 35 detect rotation pulse signals of the motors 12, 22, and 32. The amplifiers 16, 26 and 36 amplify the detection signals of the encoders 15, 25 and 35 and input them to the pulse counters 17, 27 and 37. The pulse counters 17, 27, and 37 integrate the input rotation pulse signal for a predetermined time. The pulse counters 17 and 37 input the integrated values to the diameter detection circuits 18 and 38, and the pulse counter 27 inputs the integrated values to the speed calculation circuit 29.

  The unwinding diameter detection circuit 18 detects the roll diameter of the unwinding roll 10 and selects the roll diameter used for drive control of the unwinding motor 12. A rotation pulse signal of the unwinding motor 12 detected by the encoder 15 is input to the unwinding diameter detection circuit 18 via the pulse counter 17, and the detection signal of the diameter measuring sensor 13 is averaged via the sequencer 42. It is input after processing. Thereby, the unwinding diameter detection circuit 18 acquires the calculated diameter calculated based on the rotation pulse signal and the measured diameter measured by the diameter measuring sensor 13 as the roll diameter of the unwinding roll 10. Further, the feed speed of the web 9 is input to the unwinding diameter detection circuit 18 from the speed calculation circuit 29. The unwinding diameter detection circuit 18 selects either the calculated diameter or the measured diameter as the roll diameter used for driving control of the unwinding motor 12 based on the input web 9 conveyance speed.

  Similarly, the winding diameter detection circuit 38 detects the roll diameter of the winding roll 30 and selects the roll diameter used for drive control of the winding motor 32. The winding diameter detection circuit 38 receives the rotation pulse signal of the winding motor 32 detected by the encoder 35 via a pulse counter 37 and the detection signal of the diameter measuring sensor 33 is averaged via a sequencer 42. It is input after processing. Thereby, the winding diameter detection circuit 38 acquires the calculated diameter calculated based on the rotation pulse signal and the measured diameter measured by the diameter measuring sensor 33 as the roll diameter of the winding roll 30. Further, the conveyance speed of the web 9 is input from the speed calculation circuit 29 to the winding diameter detection circuit 38. The winding diameter detection circuit 38 selects either a calculated diameter or a measured diameter as a roll diameter used for driving control of the winding motor 32 based on the input web 9 conveyance speed.

  The speed control circuits 19 and 39 are configured so that the web 9 in the unwinding roll 10 calculated from the control winding / unwinding roll diameter finally determined by the unwinding diameter / winding diameter determining unit 41 and the control unwinding roll diameter. The motors 12 and 32 are driven and controlled based on the remaining amount. The speed calculation circuit 29 calculates the transport speed of the web 9 transported by the press roll 20 from the rotation pulse signal of the motor 22 detected by the encoder 25. The information on the conveyance speed calculated by the speed calculation circuit 29 is input to the diameter detection circuits 18 and 38 as described above.

The shockless circuit 40 uses the roll diameter used for the drive control of the motors 12 and 32 by the speed control circuits 19 and 39, the roll diameter used for the previous drive control, the unwinding diameter detection circuit 18 and the winding diameter. An averaging process is performed using the roll diameters selected by the detection circuit 38. Each roll diameter averaged by the shockless circuit 40 is input to the unwinding / winding diameter determining unit 41.
In the present embodiment, assuming that the selected roll diameter is X and the roll diameter used for the previous drive control is Y, the average value Ave is calculated by the following equation.
Ave = AX + BY (1)
A and B are constants satisfying A + B = 1.

  The unwinding / winding diameter determining unit 41 compares each roll diameter (current value) input from the shockless circuit 40 with each roll diameter (previous value) input last time, under a constant condition. Each roll diameter used for drive control of 12 and 32 is determined to be either the current value or the previous value. The roll diameter finally determined by the unwinding / winding diameter determining unit 41 is input to the speed control circuits 19 and 39.

Next, conveyance control of the web 9 by the web conveyance apparatus 1 having the above configuration will be described with reference to FIG. FIG. 5 is a flowchart showing the contents of web conveyance control. The process shown here is repeatedly executed at a cycle of several msec.
First, the diameters of the unwinding roll 10 and the winding roll 30 are measured by the diameter measuring sensors 13 and 33 (step S1). Further, the amount of change in the rotation pulse per unit time in each motor 12, 22, 32 is detected (step S2). Based on the measured value in step S1 and the detected value in step S2, the measured diameter / calculated diameter of the unwinding roll 10 is acquired by the unwinding diameter detection circuit 19, and the winding roll is detected by the winding diameter detection circuit 38. 30 measured diameters / calculated diameters are acquired (step S3).

The calculated diameter r1 of the unwinding roll 10 (or the winding roll 30) is V for the web 9 conveyance speed, r0 for the roll diameter of the press roll 20 (drive roll 20a), ω0 for the angular speed, and the unwinding roll 10 ( Alternatively, the angular velocity of the take-up roll 30) is calculated as follows using ω1.
r1 = V / ω1 = (r0 × ω0) / ω1 = r0 × (ω0 / ω1) (2)
In this equation (2), the detected value in step S2 is used as the angular velocity.

  Then, in the unwinding diameter detection circuit 18 and the unwinding diameter detection circuit 38, it is determined whether or not the conveyance speed V is a target speed (step S4). That is, in step S4, it is determined whether or not the conveyance speed V is increasing or decreasing and is being accelerated or decelerated. If it is determined in step S4 that the conveyance speed V is the target speed (S4: YES), the unrolled diameter detection circuit 18 and the unwinding diameter detection circuit 38 calculate the calculated diameters as roll diameters used for motor control, respectively. Selected (step S5). On the other hand, if it is determined that acceleration or deceleration is in progress (S4: NO), the measurement diameter is selected as the roll diameter used for motor control in the unwinding diameter detection circuit 18 and the winding diameter detection circuit 38, respectively (step). S6).

  In the acceleration region or the deceleration region of each roll in which the detection error of the rotation pulse signal is increased by the processing in steps S4 to S6, the diameter detection circuit 18 and 38 selects the measurement diameter as the roll diameter used for motor control. In the steady speed range, the calculated diameter is selected as the roll diameter used for motor control. The measurement diameters selected by the diameter detection circuits 18 and 38 are not the detection values of the diameter measurement sensors 13 and 33 but are subjected to averaging processing. From these things, since the drive of each motor 12 and 32 can be controlled using each roll diameter detected accurately in the whole speed range, the web 9 can be conveyed stably.

  Here, when each roll diameter used for control of each motor 12 and 32 switches from a measurement diameter to a calculation diameter, or from a calculation diameter to a measurement diameter, there exists a possibility that each roll diameter may change rapidly. And if each roll diameter changes abruptly at the time of this switching, fluctuation | variation will arise in the rotational speed of each roll 10 and 30 with the change of the roll diameter, and the web 9 can be conveyed stably. Disappear.

  Therefore, when the roll diameter used for each motor control is selected in the unwind diameter detection circuit 18 and the unwind diameter detection circuit 38, the shockless circuit 40 selects the selected roll diameter X and the previous motor. Using the roll diameter Y used for the control, the averaging process according to the above equation (1) is performed (step S7).

  Thereby, each roll diameter used for drive control of each motor 12 and 32 can be changed smoothly. In particular, when each roll diameter used for controlling each motor 12, 32 is switched from the measured diameter to the calculated diameter, or from the calculated diameter to the measured diameter, each roll diameter used for controlling each motor 12, 32 is rapidly increased. It is possible to prevent the change. Therefore, the web 9 can be stably conveyed even when the rotational speed of each of the rolls 10 and 30 shifts from the acceleration region to the steady region or when the rotation speed shifts from the steady region to the deceleration region.

  Here, during the conveyance of the web 9, the roll diameter of the unwinding roll 10 gradually decreases, and the roll diameter of the winding roll 30 gradually increases. However, since the roll diameter used to control the motors 12 and 32 is obtained from the output values from the two types of sensors, the contact and non-contact type sensors, the unwinding diameter detection circuit 18 causes the previous time due to the influence of noise and the like. A roll diameter larger than the acquired roll diameter may be acquired, or a roll diameter smaller than the roll diameter acquired last time by the winding diameter detection circuit 38 may be acquired. In such a case, if the roll diameters acquired by the diameter detection circuits 18 and 38 are used as they are for the control of the motors 12 and 32, the rotational speeds of the rolls 10 and 30 are fluctuated and the web 9 is stabilized. Cannot be transported.

  Therefore, the unwinding / winding diameter determination unit 41 compares the roll diameter used for the current motor drive control (current value) with the roll diameter used for the previous motor drive control (previous value) ( Step S8). Specifically, in step S8, it is determined whether or not the current value is less than or equal to the previous value on the unwinding side, and whether or not the current value is greater than or equal to the previous value on the winding side.

  If the determination in step S8 is affirmative (S8: YES), the roll diameter used for motor drive control is determined to be the current value by the unwinding / winding diameter determining unit 41, and the current value is used for each motor. The drive of 12, 32 is controlled (step S9). Specifically, when the current value is equal to or less than the previous value on the unwinding side, the current value is used by the speed control circuit 19 and the unwinding speed of the web 9 from the unwinding roll 10 becomes equal to the transport speed V. Thus, the drive of the unwinding motor 12 is controlled. On the other hand, when the current value is equal to or higher than the previous value on the winding side, the current value is used by the speed control circuit 39 so that the winding speed of the web 9 to the winding roll 30 becomes equal to the conveying speed V. The drive of the winding motor 32 is controlled.

  Conversely, if the determination in step S8 is negative (S8: NO), the unwinding / winding diameter determining unit 41 determines the roll diameter used for motor drive control as the previous value, and the previous value is used for each. The drive of the motors 12 and 32 is controlled (step S10). Specifically, when the current value is larger than the previous value on the unwinding side, the previous value is used by the speed control circuit 19 so that the unwinding speed of the web 9 from the unwinding roll 10 becomes equal to the transport speed V. In addition, the driving of the unwinding motor 12 is controlled. On the other hand, when the current value is smaller than the previous value on the winding side, the previous value is used by the speed control circuit 39 so that the winding speed of the web 9 onto the winding roll 30 is equal to the conveying speed V. The drive of the take-up motor 32 is controlled.

  By such processing of steps S8 to S10, the roll diameter used for driving control of the unwinding motor 12 becomes larger than the previous value, and the roll diameter used for driving control of the winding motor 32 becomes smaller than the previous value. This can be surely prevented. Accordingly, since the rotation speed of each roll does not vary, the web 9 can be conveyed very stably.

Thereafter, in the speed control circuit 19, the roll diameter used for drive control of the unwinding motor 12 (rotational speed control of the unwinding roll 10) in step S9 or S10 is used, and the remaining amount of the web 9 in the unwinding roll 10 is determined. Calculated (step S9). Specifically, as shown in FIG. 6, the diameter of the roll core in the unwinding roll 10 is D0, the roll diameters of the unwinding roll 10 at times t1 and t2, D1 and D2, and the elapsed time (t2-t1). If the number of rotations of the unwinding roll is n, the thickness T of the web 9 is
T = (D1-D2) / 2n (3)
The remaining amount L of the web 9 at time t2 is
L = π (D2 ² −D0 ² ) / 4T (4)
It becomes.

When the remaining amount of the web 9 is calculated from the above equation (4), the calculated remaining amount L of the web 9 is L ≦ L0 + α
It is determined whether or not the above relationship is satisfied (step S12). That is, it is determined whether or not the remaining amount of the web 9 in the unwinding roll 10 has become a predetermined amount or less. Here, L0 is a distance required from the start of deceleration to the stop, and can be calculated by the following equation, where V is the conveyance speed of the web 9 and t0 is the deceleration time.
L0 = (V × t0) / 2 (5)
Moreover, (alpha) is a stop margin and should just be set to about 1-5 m.

  If the determination in step S12 is affirmative, that is, if the remaining amount of the web 9 is equal to or less than the predetermined amount (S12: YES), the motors 12, 22, and 32 are decelerated and stopped. (Step S13). On the other hand, if the determination in step S12 is negative, that is, if the remaining amount of the web 9 is larger than the predetermined amount (S12: NO), it is not necessary to stop the motors 12, 22, and 32. Return to and repeat the above process.

  Since the web 9 can be unwound from the unwinding roll 10 until the remaining amount of the web 9 in the unwinding roll 10 is almost exhausted by the processes in steps S12 and S13, the yield of the unwinding roll 10 is improved. Can do. That is, the remaining amount of the web 9 wound around the unwinding roll 10 can be extremely reduced. In the present embodiment, the remaining amount of web that has been about 50 m in the conventional conveying device can be reduced to about 3 m.

  In addition, the roll diameter used for drive control of the unwinding motor 12 (rotational speed control of the unwinding roll 10) in step S9 or S10 became below a predetermined threshold set in advance without calculating the web remaining amount. Sometimes, the motors 12, 22, and 32 may be decelerated and stopped. Even with such conveyance control, the yield of the unwinding roll 10 can be improved, that is, the remaining amount of the web 9 wound around the unwinding roll 10 can be reduced. In addition, what is necessary is just to determine a threshold value from the roll diameter and the stop required distance which want to leave to the unwinding roll 10.

  Next, changes in various roll diameters and web transport speeds when the above transport control is performed will be described with reference to FIGS. FIG. 7 is a time chart showing changes in various roll diameters. FIG. 8 is a time chart showing how the web conveyance speed changes. 7 and 8 show various signals in the acceleration region and the steady region in the speed control of the unwinding roll.

  As shown in FIG. 7, in the acceleration region (particularly in the initial stage), the detection error of the rotation pulse signal from the unwinding motor 12 becomes large, so that the calculation diameter rcal of the unwinding roll 10 is not stable. However, in the present embodiment, the measured diameter rmea is used as the control diameter rcon of the unwinding motor 12 until the conveyance speed V of the web 9 reaches the target speed (S4: NO, S6 in FIG. 5). The value used as the control diameter rcon at this time is obtained by averaging the measured diameter rmea. For this reason, as the control diameter rcon, it is possible to use a roll diameter measured with high accuracy with almost no influence of the unwinding roll 10 and noise. As a result, as shown by a solid line in FIG. 8, the speed control of the unwinding roll 10 can be performed more accurately in the acceleration region than in the conventional conveying device shown by a broken line in FIG. 8.

  Then, when shifting from the acceleration region to the steady region, the roll diameter used for controlling the unwinding motor 12 is changed from the measured diameter rmea to the calculated diameter rcal (S4 in FIG. 5: NO, S6). At this time, as shown in FIG. 7, since the measured diameter rmea and the calculated diameter rcal are different, if the calculated diameter rcal is used as it is as the control diameter rcon, the rotational speed of the unwinding roll 10 varies, The web 9 cannot be stably conveyed. However, in the present embodiment, since the shockless process (S7 in FIG. 5) is performed, as shown in FIG. 7, the control diameter rcon can be gradually changed without rapidly changing. As a result, as shown by a solid line in FIG. 8, the speed control of the unwinding roll 10 can be performed with high accuracy even when shifting from the acceleration region to the steady region.

  In addition, although control in the deceleration area of the unwinding roll 10 and control in the acceleration / deceleration area of the winding roll 30 were not illustrated, these controls also detect (measure or calculate) with high accuracy as described above. ) Roll diameter can be used as the control diameter rcon, and the speed control of each roll 10, 30 can be performed with high accuracy.

  Thus, in this Embodiment, as a result of being able to perform speed control of each roll 10 and 30 with sufficient precision, the web 9 can be conveyed in the state with constant tension applied to the web 9. That is, fluctuations in the conveyance speed and tension of the web 9 can be suppressed. Thereby, in the slitter process 90, the web 9 is not cut twice due to the cutting displacement, and the cutting quality can be stabilized.

  As described above in detail, according to the conveyance control method for the web 9 by the conveyance device 1 according to the embodiment, during acceleration or deceleration, the non-contact type diameter measurement sensor 13, The measured value rmea of 33 is used to control the motors 12 and 32. In the steady speed range, the calculated diameter rcal based on the rotation pulse signal detected by the encoders 15 and 35 is used to calculate the motors 12 and 32. Is controlled. Thereby, the web 9 can be stably conveyed also in the acceleration area or the deceleration area of each roll 10,30.

  In the shockless circuit 40, the roll diameter X selected by the unwinding diameter detection circuit 18 and the winding diameter detection circuit 38 and the roll diameter Y used for motor control up to the previous time are used. An averaging process is performed by (1). By this process, each roll diameter rcon used for driving control of each motor 12, 32 can be smoothly changed. In particular, when each roll diameter used for controlling each motor 12, 32 is switched from the measured diameter to the calculated diameter, or from the calculated diameter to the measured diameter, each roll diameter used for controlling each motor 12, 32 is rapidly increased. It is possible to prevent the change. Thereby, the web 9 can be stably conveyed even when the rotational speed of each of the rolls 10 and 30 shifts from the acceleration region to the steady region or when the rotation speed shifts from the steady region to the deceleration region.

It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the case where the present invention is applied to the slitter process in the manufacturing process of the electrode material of the lithium ion secondary battery is illustrated. However, the present invention is not limited to this, for example, the paste coating shown in FIG. It can also be applied to construction processes. If the present invention is applied to the paste coating process, fluctuations in the web conveyance speed and tension can be suppressed, so that uneven coating of the paste can be prevented and the coating quality can be stabilized.
The present invention is not limited to the manufacturing process of the electrode material of the lithium ion secondary battery, and can be widely applied to a process of transporting a belt-like material (for example, paper or film).

  Furthermore, although ultrasonic sensors are used as the diameter measuring sensors 13 and 33 in the above-described embodiment, the diameter measuring sensors 13 and 33 are not limited to the ultrasonic sensors, and each roll diameter is measured in a non-contact manner. Any sensor (for example, a photoelectric sensor or the like) that can be used.

DESCRIPTION OF SYMBOLS 1 Conveying device 2 Unwinding part 3 Traveling part 4 Winding part 9 Web 10 Unwinding roll 11 Holding stand 12 Unwinding motor 13 Diameter measurement sensor 15 Encoder 18 Unwinding diameter detection circuit 19 Speed control circuit 20 Press roll 20a Drive roll 20b Follower roll 22 Motor 25 Encoder 29 Speed calculation circuit 30 Winding roll 31 Holding base 32 Winding motor 33 Diameter measuring sensor 35 Encoder 38 Unwinding diameter detection circuit 39 Speed control circuit 40 Shockless circuit 41 Unwinding diameter / winding diameter determination Part

Claims (11)

In the belt-shaped material transporting device that transports the belt-shaped material to a winding roll that winds the belt-shaped material fed from the unwinding roll on which the belt-shaped material is wound.
An unwinding roll drive motor for driving the unwinding roll;
A winding roll drive motor for driving the winding roll;
A line master roll that is disposed between the unwinding roll and the winding roll and transports the belt-shaped material,
A master roll drive motor for driving the line master roll;
The unwinding roll, the unwinding roll and the unwinding roll rotation sensor connected to the line master roll, the winding roll rotation sensor and the master roll rotation sensor;
A non-contact unwinding diameter measuring sensor and a winding diameter measuring sensor for measuring the diameter of the unwinding roll and the winding roll;
Based on the rotation pulse signals of the unwinding roll rotation sensor and the master roll rotation sensor, and the winding roll rotation sensor and the master roll rotation sensor, which are input via a counter, the unwinding roll and the unwinding roll While calculating the diameter, the unwinding roll diameter detection circuit and the winding roll diameter detection circuit for measuring the diameter of the unwinding roll and the winding roll by the unwinding diameter measurement sensor and the winding diameter measurement sensor,
A rotation speed signal of the master roll rotation sensor is input via a counter, and a conveyance speed calculation circuit that calculates the conveyance speed of the strip material based on the input value;
A winding roll drive motor control circuit and a winding roll drive motor control circuit for controlling driving of the winding roll drive motor and the winding roll drive motor;
The unwinding roll drive motor control circuit and the take-up roll drive motor control circuit are:
In the acceleration region where the transport speed of the strip material is increased calculated by the transport speed calculation circuit, or in the deceleration region where the transport speed of the strip material is decreasing, the unwinding roll diameter detection circuit and the winding Using the measured diameters of the unwinding roll and the winding roll by the diameter measuring sensors respectively acquired by the roll diameter detection circuit, the driving of the unwinding roll drive motor and the winding roll drive motor is controlled respectively.
In the steady speed range in which the transport speed of the strip material calculated by the transport speed calculation circuit is a target speed, the unwinding roll diameter detection circuit and the winding roll diameter detection circuit are based on each rotation pulse signal, respectively. A belt-shaped material conveying apparatus, wherein the calculated roll diameters of the unwinding roll and the winding roll are used to control driving of the unwinding roll drive motor and the winding roll drive motor, respectively. In the strip | belt-shaped material conveyance apparatus described in Claim 1,
The roll diameter used for the drive control of each motor in the unwinding roll drive motor control circuit and the take-up roll drive motor control circuit is the roll diameter used for the previous drive control and the roll used for the current drive control. A belt-shaped material conveying apparatus comprising a shockless circuit that smoothly changes by performing an averaging process on the diameter. In the conveyance apparatus of the strip | belt-shaped material of Claim 1 or Claim 2,
The unwinding roll drive motor control circuit uses the unwinding roll diameter used for drive control of the unwinding roll drive motor, and the unwinding roll diameter used for the current drive control by the unwinding roll drive motor control circuit is the previous drive. When the diameter is equal to or larger than the unwinding roll diameter used for the control, the unwinding roll diameter used for the previous drive control is set, and the winding roll drive motor control circuit is used for driving control of the winding roll drive motor. When the winding roll diameter used for the current drive control is equal to or smaller than the winding roll diameter used for the previous drive control, the roll is set to the winding roll diameter used for the previous drive control. A belt-shaped material conveying device comprising a diameter determining means. In the conveyance apparatus of any one strip | belt-shaped material as described in any one of Claims 1-3,
The unwinding roll drive motor control circuit and the take-up roll drive motor control circuit decelerate each motor when the calculated diameter of the unwinding roll calculated by the unwinding roll diameter detection circuit is equal to or less than a predetermined threshold. A belt-shaped material conveying device characterized by being stopped. In the conveyance apparatus of any one strip | belt-shaped material as described in any one of Claims 1-3,
The unwinding roll drive motor control circuit and the unwinding roll drive motor control circuit are calculated by the unwinding roll diameter detection circuit, the calculated diameter of the unwinding roll, the core diameter of the unwinding roll, and the belt-like material. When the remaining amount of the strip-shaped material of the unwinding roll calculated based on the thickness of the unrolled roll becomes a predetermined amount or less, the respective motors are decelerated and stopped. In the conveyance apparatus of any one strip | belt-shaped material as described in any one of Claims 1-5,
The strip material is a battery electrode material,
The belt-shaped material conveying apparatus, wherein the line master roll is a press roll for pressing the electrode material. In a transport control method for transporting the belt-shaped material to a take-up roll that winds the belt-shaped material through a line master roll that transports and travels the belt-shaped material fed from the unwinding roll around which the belt-shaped material is wound. ,
The diameters of the unwinding roll and the unwinding roll are calculated based on the rotation pulse signals of the motors driving the rolls, and the unwinding roll and the winding roll are Get each measured diameter value,
In the acceleration area where the transport speed of the strip-shaped material is increasing, or in the deceleration area where the transport speed of the strip-shaped material is decreasing, the measured diameters of the unwinding roll and the unwinding roll acquired from the diameter measuring sensor are set. And controlling the driving of each motor that drives the unwinding roll and the winding roll,
In the steady speed range where the transport speed of the belt-like material is the target speed, the unwinding roll and the winding roll are made to use the calculated diameters of the unwinding roll and the unwinding roll based on the rotation pulse signal. A belt-shaped material conveyance control method characterized by controlling driving of each motor to be driven. In the belt-shaped material conveyance control method according to claim 7,
Each roll diameter used for drive control of each motor is smoothly changed by averaging the roll diameter used for the previous drive control and the roll diameter used for the current drive control. A method for controlling the conveyance of the belt-like material. In the conveyance control method of any one strip | belt-shaped material described in Claim 7 or Claim 8,
When the unwinding roll diameter used for the drive control of the unwinding roll drive motor is equal to or larger than the unwinding roll diameter used for the previous drive control, the previous drive In addition to the winding roll diameter used for the control, the winding roll diameter used for the drive control of the winding roll drive motor is the same as the winding roll diameter used for the previous drive control. When the roll diameter is equal to or less than the roll diameter, the belt-shaped material conveyance control method is characterized in that the winding roll diameter used in the previous drive control is set. In the conveyance control method of any one strip | belt-shaped material described in Claim 7 to 9,
When the calculated diameter of the unwinding roll is equal to or less than a predetermined threshold, the respective motors are decelerated and stopped. In the conveyance control method of any one strip | belt-shaped material described in Claim 7 to 9,
Each motor is decelerated and stopped when the remaining amount of the strip material of the unwinding roll calculated based on the calculated diameter of the unwinding roll, the core diameter of the unwinding roll, and the thickness of the strip material is equal to or less than a predetermined amount. A method for controlling the conveyance of a belt-shaped material, characterized in that:

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