JPH08231101A - Tension control device - Google Patents

Abstract

(57) [Summary] [Purpose] During inching operation, output lower limit control is applied to perform appropriate tension control. [Structure] The closed loop tension control system 5 is a long material 30.
Of the long material 30 during the feeding operation by outputting the torque control output according to the difference between the detected tension during the feeding operation of the sheet and the preset tension to the torque control actuator.
Control the tension of so that it becomes the preset tension,
The stall tension control system 7, 9 outputs a stall control output for controlling the tension of the long material 30 to be a constant tension during the start or stop of the feeding operation of the long material 30 to the actuator for torque control, and an inching command. The input means 17 inputs an inching command for repeatedly starting and stopping the feeding operation of the long material 30, and the lower limit limiting means 19 turns on the inching command input to set the lower limit value of the torque control output of the closed loop tension control system to the stall tension control system. Limit to stall control output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to tension control during an inching operation in which a tension control device is repeatedly started and stopped.

[0002]

2. Description of the Related Art FIG. 4 shows, as an example of a conventional unwinding and winding device for a long material, a long material such as paper, plastic, or metal is unwound from an unwinding portion and the unwound long material is unwound. FIG. 3 is a configuration diagram showing a processing device for a long material, in which processing such as printing, press molding or laminating is performed on the material, and the long material after the processing is wound around a winding unit. The processing apparatus shown in FIG. 4 mounts, for example, a fully-extending unwinding frame 31 in which the long material 30 is preliminarily wound on the outer circumferential surface of the reel shaft in the unwinding section 32, and also the outer circumferential surface of the reel shaft For example, an empty winding frame 33 in which the long material 30 is not wound in advance is attached to the winding portion 34, the unwinding start end of the long material 30 is pulled out from the unwinding frame 31, and the unwinding start end is set to 3 An unwinding side detection roll 36 and two guide rolls 35 and 37, which are arranged in points, are passed in a mountain shape and then passed between a pair of upper and lower feed rolls 38 and 39, and the unwinding start end is further applied to a printing machine, a press machine or a laminate. The winding side detection roll 42 and the two guide rolls 41, 43 arranged at three points are passed through the processing device 40 such as a processing machine in a mountain shape, and then wound around the outer peripheral surface of the winding frame shaft of the winding unit 34. In this state, the feed motor 44 and the take-up motor 4
5 is rotatively driven in one direction, the long material 30 is unwound from the unwinding frame 31 by the drive of the feed motor 44, and the long material 30 fed from the feed motor 44 is subjected to predetermined processing by the processing device 40. While the processed long material 30 is sequentially wound on the outer peripheral surface of the winding shaft of the winding frame 33 by driving the winding motor 45,
The unwinding side tension detectors 46 provided at both ends of the central unwinding side detection roll 36 located on the lower surface of the long material 30 between the unwinding frame 31 and the feed rolls 38 and 39 are the unwinding side. The tension received by the detection roll 36 from the long material 30 is converted into an electric signal and output to the unwinding side tension control device 47.

The unwinding side tension control device 47 is used for the long material 30.
Unwinds the torque control output according to the difference between the unwinding side set tension preset according to the material and the type based on the width and thickness and the unwinding side detected tension from the unwinding side tension detector 46. Output to the powder brake 48 as a torque control actuator of the portion 32, and the tension of the long material 30 connected to the unwinding frame 31 during the feeding operation of the powder brake 48 is controlled to be the unwinding side set tension. By applying a braking torque to the unwinding frame 31, it is possible to prevent the unrolled portion of the long member 30 from the unwinding frame 31 from being overtightened or loosened.

The feed rolls 38 and 39 to the winding frame 3
The winding-side tension detectors 49 provided on both ends of the central winding-side detection roll 42 located on the lower surface of the long-length member 30 up to 3 have the winding-side detection rolls 42 extending from the long member 30. The received tension is converted into an electric signal and output to the winding side tension control device 50. The winding-side tension control device 50 outputs a torque control output according to the difference between the winding-side detected tension and the winding-side set tension to the powder clutch 51 as the torque control actuator of the winding section 34, and the powder clutch. By giving a transmission torque (winding torque) to the winding frame 33 for controlling the tension of the long material 30 continuous with the winding frame 33 during the feeding operation so that the tension becomes the set tension on the winding side. The length of the long material 30 can be adjusted by appropriately adjusting the winding force in the winding section 34, which is excessive or insufficient.
Prevents the occurrence of wrinkles, misalignment, blurring of the product, defective shape, or irregular winding of the bamboo frame 33 on the product due to slack or elongation along the long side. are doing.

The powder brake 48 has a drive member 48a connected to the unwinding shaft of the unwinding frame 31, a driven member 48b fixed to a non-rotating portion of the machine, and a space between the drive member 48a and the driven member 48b. It has a powder, which is a ferromagnetic powder such as fine iron powder (not shown), filled in the above, and an exciting coil 48c for magnetizing the powder, and supplies a current according to the torque control output to the exciting coil 48c. By generating a magnetic field to magnetize the powder, a braking torque is generated between the drive member 48a and the driven member 48b according to the strength of the magnetization of the powder.

The powder clutch 51 has a drive member 51a connected to the output shaft of the winding motor 45 and a driven member 51b connected to the winding frame shaft of the winding frame 33.
A powder which is a ferromagnetic material powder such as fine iron powder (not shown) filled between the drive member 51a and the driven member 51b, and an exciting coil 51c for magnetizing the powder.
And a current according to the torque control output is supplied to the exciting coil 51c to generate a magnetic field to magnetize the powder, thereby driving the drive member 51a and the driven member 51b.
A transmission torque corresponding to the strength of the magnetization of the powder is generated between and.

By the way, although the unwinding side tension control device 47 and the winding side tension control device 50 are controlled by different devices from the powder brake 48 and the powder clutch 51, the unwinding side tension control device 47 and the winding side tension control device. Since the basic structure of the control device 50 is the same, the basic structure will be described with reference to FIG.

In FIG. 5, reference numerals 1, 2, and 3 are the unwinding side and winding side detection rolls and guide rolls 35 to 37, 4 of FIG.
The detection rolls and the guide rolls 4 corresponding to 1 to 43 are provided on both end sides of the central detection roll 2 located on the lower surface of the long material 30, and are provided on the unwinding side and winding side tension detectors 46 in FIG.
A tension detector corresponding to 49 is a torque control output for constituting a closed loop tension control system for outputting a torque control output according to a difference between the tension detected by the tension detector 4 and a preset tension. It is a computing means.

Reference numeral 6 is a manual torque setting means of an open loop tension control system, and 7 is a stall tension for outputting a stall control output for controlling the tension of the long material to a constant tension during the start or stop of the feeding operation of the long material 30. A stall setting means in which the set stall of the control system is preset, 8 is a stall storage means for updating the torque control output from the torque control calculation means 5 which changes from moment to moment as a memory stall through the operation stop changeover switch 9, Is a stall changeover switch for outputting either the setting stall from the stall setting means 7 or the stored stall from the stall storage means 8 to the operation stop changeover switch 9, 11 is a manual automatic changeover switch, and 12 is a long material 30. Stop gain means to determine the magnification from the start of the feeding operation of the 13 is an output from the stop gain unit 12 to the powder brake 48 and the powder clutch 51 in FIG.

Reference numeral 14 designates an operation / stop command input by a manual operation, an operation stop changeover switch 9 and a stop gain 1
It is an operation stop command input means for outputting to 2, which is
When the operation command is turned on, the movable contact 9a of the operation stop changeover switch 9 is switched from the fixed contact 9c to the fixed contact 9b as shown by a solid line, and the torque control output from the torque control output calculation means 5 is manually and automatically changed over. 1
0 and output to the stall storage means 8 and the operation command is turned off, the movable contact 9a is switched from the fixed contact 9b to the fixed contact 9c as shown by the dotted line, and the stall tension control system set stall or the memory stall is set. One of them is output to the manual automatic changeover switch 11, and the stop gain means 12 is activated from the turning off of the operation command until the stop timer (not shown) times up.

Reference numeral 15 is a stall memory reset command input means for outputting a stall memory reset command input by a manual operation to the stall changeover switch 10.
By turning on the stall memory reset command input,
The movable contact 10a of the stall changeover switch 10 is switched from the fixed contact 10c to the fixed contact 10b as shown by a solid line, the stall storage means 8 is switched to the stall setting means 7, the stall memory is reset, and the operation memory stop changeover switch 9 is fixed. While outputting to the contact 9c, when the stall memory reset command input is turned off, the movable contact 1
0a from the fixed contact 10b to the fixed contact 10 as shown by the dotted line.
The stall memory value stored in the stall memory means 8 after switching to c is output to the fixed contact 9c of the operation memory stop switching switch 9.

Reference numeral 16 denotes a manual / automatic switching means for outputting a manual / automatic switching input for switching between a closed loop tension control system and an open loop tension control system by manual operation to a manual / automatic changeover switch 11, which is a manual operation. When the switching input is turned on, the movable contact 11a of the manual automatic changeover switch 11 is switched from the fixed contact 11c to the fixed contact 11b as shown by the dotted line, and the manually set torque from the manual torque setting means 6 is supplied to the stop gain means 12. On the other hand, when the automatic switching input is turned on while outputting, the movable contact 11a is switched from the fixed contact 11b to the fixed contact 11c as shown by a solid line, and the output from the operation stop changeover switch 9 is changed to the stop gain means 1.
Output to 2.

Next, the operation of the above tension control device by inputting the operation stop command will be described with reference to FIG.
First, in step 601 of FIG. 6, while the feeding operation of the long material 30 is stopped, the movable contact 9a of the operation stop changeover switch 9 is switched from the fixed contact 9b to the fixed contact 9c as shown by the dotted line in FIG. Either the set stall or the memory stall as the stall control output is output to the output terminal 13. Then, when the operation command is turned on in step 602 of FIG. 7, the movable contact 9a of the operation stop changeover switch 9 is switched from the fixed contact 9c to the fixed contact 9b as shown by the solid line in FIG. The torque control output from the torque control output calculating means 5 is output as it is to the output end 13 with the set stall or the memory stall as a preset. afterwards,
When the operation command is turned off in step 604 of FIG. 6, the stop gain means 12 is activated, and the closed loop output is multiplied by the stop gain and output to the output end 13. Then, in step 606 of FIG. 6, when the stop timer (not shown) for counting the time for performing the inertia compensation control at the time of stop is timed up, the movable contact 9a of the operation stop changeover switch 9 has the fixed contact as shown by the dotted line in FIG. By switching from 9b to the fixed contact 9c, the stall storage means 8 stores the output when the stop timer times out in step 607 of FIG.

The relationship between the operation stop command input of the tension control device, the feed rate of the long material, and the tension will be described with reference to the unwinding side timing chart shown in FIG. At the moment when the operation stop command is turned on and the feed rate of the long material 30 is switched from stop to acceleration, the long material 3 is caused by the inertia of the material and the machine.
The tension of 0 rises sharply as indicated by the symbol a. Then, while the feeding speed of the long material 30 is accelerating, the tension of the long material 30 slightly decreases as indicated by the symbol b, while the output end 13
The torque control output of the closed loop tension control system output from the motor decreases as indicated by the symbol c. Then, at the moment when the feeding speed of the long material 30 is switched from the acceleration to the constant speed, the tension of the long material 30 sharply drops as indicated by the symbol d due to the inertia of the material and the machine. And the long material 30
During the constant speed operation of the, the tension of the long material 30 has the sign e.
As shown by, the torque control output of the closed loop tension control system output from the output end 13 similarly gradually increases. Next, at the moment when the operation stop command is turned off and the feeding speed of the long material 30 is switched from the constant speed to the deceleration, the tension of the long material 30 sharply drops due to the inertia of the machine as indicated by the symbol f. Then, while the feeding speed of the long material 30 is decelerating, the tension of the long material 30 rises as indicated by a sign g, while the set stall or the memory stall of the stall tension control system is doubled from the output end 13 by the stop gain. The generated output is output during the period of the stop timer as indicated by the symbol h. Subsequently, at the moment when the feeding speed of the long material 30 switches from deceleration to stop, the inertia of the machine causes the tension of the long material 30 to increase and then decrease as indicated by the symbol i, and then decrease to a constant tension as indicated by the symbol j. On the other hand, the operation pattern is such that the set stall or the memory stall of the stall tension control system is output from the output end 13 as indicated by a symbol k.

[0015]

In the above-mentioned conventional tension control device, the long member 30 is operated by the operation stop command input means 14.
Since it is configured to start and stop the feeding operation of
In the material change of the long material 30, when the inching operation in which the feeding operation of the long material 30 is repeatedly started and stopped is performed for the purpose of aligning the long material 30 with the machine, the control time constant is long and the control response is long. Due to the delay, a large tension fluctuation occurs due to the influence of the inertia of the reel and the machine. As shown in FIG. 8, the change in tension becomes larger as the material winding diameter of the winding frame is larger and the inertia is higher. In particular, at the time of high inertia, as shown in FIG. 9, due to the high inertia, the acceleration instant at which switching is made from stop to startup, the constant speed instant at which acceleration is switched to constant speed, the deceleration instant at which constant speed is switched to deceleration, and the deceleration At the instant of stopping when switching to stop, large tension fluctuations called overshoot and undershoot occur, and the long material 30 is too tight or too loose. Excessive tension at the moment of acceleration or stop, and excessive slack at the moment of deceleration are easy to eliminate temporarily, so there is no problem. However, excessive slack at the constant speed instant causes the long material 30 to separate from the rolls such as tension rolls and feed rolls. There is a high possibility that the long material 30 will be entangled with the machine and cut, and if the long material 30 is entangled with the machine and cut, the long material 30 will be wasted considerably.

The present invention has been made to solve the above problems, and an object thereof is to provide a tension control device capable of performing an appropriate tension control by applying an output lower limit control during an inching operation. .

[0017]

A tension control device of the present invention comprises a closed loop tension control system, a stall tension control system, an inching command input means and a lower limit limiting means, and the closed loop tension control system feeds a long material. By outputting the torque control output according to the difference between the detected tension during operation and the preset tension set to the torque control actuator, the tension of the long material during the feeding operation is set to the preset tension. The stall tension control system outputs a stall control output to the torque control actuator to control the tension of the long material to a constant tension during or after the feeding operation of the long material is started or stopped. The command input means inputs an inching command that repeats the start and stop of the long material feeding operation, and the lower limit limiting means closes when the inching command input turns on. It is configured to limit the lower limit value of the torque control output of the loop tension control system to stall control output of the stall tension control system.

[0018]

According to the tension control device of the present invention, the stall control output is output while the feeding operation of the long material is stopped, and when the inching command input is turned on by the inching command input means,
The stall control output is output during the closed loop tension control in which the lower limit value of the torque control output is limited to the stall control output by the lower limit limiting device, and the inertia compensation control is performed by the inching command input device from when the inching command input is off to when it is stopped. Performs stall tension control multiplied by the stop gain, and outputs the stall control output before the inching command input turns on after inertia compensation control.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings by attaching the same reference numerals to the same portions as those of the conventional example. FIG.
2 is a configuration diagram showing a tension control device as an embodiment of the present invention, FIG. 2 is a flow chart showing tension control by an inching command input of the embodiment, and FIG. 3 is a timing chart explaining the operation of the embodiment.

Referring to FIG. 1, the tension control device in this embodiment includes a torque control output computing means 5, a manual torque setting means 6, a stall setting means 7, a stall storage means 8, an operation stop changeover switch 9, a stall changeover switch 10, In addition to the automatic manual changeover switch 11, the stop gain means 12, the output end 13, the operation stop command input means 14, the stall memory reset command input means 15 and the manual automatic changeover command input means 16, an inching command input means 17 and a lower limit limiting means 18 are provided. Have.

The inching command input means 15 is an inching changeover switch 19, a stop gain means 12 and an operation stop changeover switch 9 for an inching command input for repeating start and stop of the feeding operation of the long material 30 by human operation.
Output to.

The lower limit limiting means 18 limits the lower limit value of the torque control output of the closed loop tension control system to the stall control output such as the set stall or the memory stall of the stall tension control system when the inching command input is turned on. Specifically, it has an inching changeover switch 19 and a lower limit comparator 20.

The inching changeover switch 19 is inserted between the operation stop changeover switch 9 and the manual automatic changeover switch 11, and is a movable contact 19a connected to the fixed contact 11c of the manual automatic changeover switch 11 and a movable contact 9a of the operation stop changeover switch 9. When the inching command input from the inching command input means 15 is turned on, the movable contact 19a is fixed as shown by the dotted line. The fixed contact 19b is connected to the lower limit comparator 20 and the fixed contact 19c is connected to the output terminal of the lower limit comparator 20. When the contact point 19b is switched to the fixed contact point 19c and the inching command input from the inching command input means 15 is turned off, the movable contact point 19a is switched from the fixed contact point 19c to the fixed contact point 19b as shown by a solid line.

The lower limit comparator 20 is a torque of the closed loop tension control system when the movable contact 9a of the operation stop changeover switch 9 is switched from the fixed contact 9c to the fixed contact 9b when the inching command input from the inching command input means 15 is turned on. The control output is compared with the set stall or memory stall of the stall tension control system, and the lower limit value of the torque control output of the closed loop tension control system is limited to the set stall or memory stall of the stall tension control system. Fixed contact 1
9c.

Next, the inching operation of this embodiment will be described with reference to FIG.
Will be described with reference to. First, step 201 in FIG.
In, the set stall or the memory stall is output to the output terminal 13 while the feeding operation of the long material 30 is stopped. When the inching command input is turned on in step 202 of FIG. 2, the movable contact 9a of the operation changeover switch 9 is switched from the fixed contact 9c to the fixed contact 9b as shown by the solid line in FIG. 19a is a fixed contact 19 as shown by the dotted line in FIG.
By switching from b to the fixed contact 19c, as shown in FIG.
In step 203, closed loop tension control in which the set stall or the memory stall is preset, the torque control output from the torque control output calculation means 5 is output to the lower limit comparator 20, and the lower limit comparator 20 outputs the torque control output. The torque control output from the calculation means 5 is compared with the set stall or the memory stall, and the lower limit comparator 20 inching the output in which the lower limit value of the torque control output from the torque control output calculation means 5 is limited to the set stall or the memory stall. It outputs to the output terminal 13 as it is via the changeover switch 19, the manual automatic changeover switch 11 and the stop gain means 12. After that, when the inching command input is turned off in step 204 of FIG. 2, the stop gain means 12 is activated and the movable contact 9a of the operation stop changeover switch 9 is changed from the fixed contact 9b to the fixed contact 9c as shown by the dotted line in FIG. By changing the movable contact 19a of the inching changeover switch 19 from the fixed contact 19c to the fixed contact 19b as shown by the solid line in FIG. 1, the set stall or the memory stall is multiplied by the stop gain in step 205 of FIG. 13 is output. Then, in step 206 of FIG. 2, when the stop timer (not shown), which is the time for performing inertia compensation control at the time of stop, times out, in step 207 of FIG. 2, the set stall or the memory stall before the inching command input is turned on is output. Output to end 13.

In short, according to this embodiment, as shown in the timing chart on the unwinding side of FIG. 3, considering the relationship between the operation stop command input of the tension control device and the feeding speed and tension of the long material, The inching command input turns on,
While the feeding speed of the long material 30 is being accelerated from the stop, the long material 30
Although the tension of No. 1 sharply rises as indicated by the symbol m and then decreases a little, the torque control output of the closed loop tension control system output from the output end 13 is the constant output of the set stall or the memory stall as indicated by the symbol p. Becomes Then, at the moment when the feeding speed of the long material 30 is switched from acceleration to constant speed, the tension of the long material 30 sharply drops as indicated by the symbol q due to the inertia of the machine, but the torque control of the closed loop tension control system is performed. Since the output is still the constant output indicated by the symbol p, the tension of the long material 30 which is drastically lowered indicated by the symbol q is in the vicinity before the inching command input is turned on as indicated by the symbol r. Since it recovers immediately until, the control response is good, and the long material 3
It is possible to eliminate the inconvenience that 0 separates from the roll and becomes entangled in the machine. Subsequently, when the feeding speed of the long material 30 becomes constant and the tension of the long material 30 recovers as shown by the symbol s and then starts to rise very slowly, the closed loop tension output from the output end 13 is obtained. The torque control output of the control system gradually increases as indicated by the symbol t. Next, while the inching command input is turned off and the feeding speed of the long material 30 is decelerating from the constant speed, the tension of the long material 30 falls and rises as indicated by the symbol u, but from the output end 13. As indicated by a symbol v, an output obtained by multiplying the set stall of the stall tension control system or the stored stall by the stop gain is output during the period of the stop timer. Then, at the moment when the feeding speed of the long material 30 switches from deceleration to stop, the long material 3
While the tension of 0 increases and then decreases as indicated by the symbol w and then becomes the constant tension indicated by the symbol x, the output end 13 outputs a fixed output by the set stall or memory stall of the stall tension control system indicated by the symbol p. Therefore, the operation pattern is such that the stall state is constant.

In the inching operation, the change in the material winding diameter of the bobbin is much smaller than that in the normal operation, so there is no problem even if the stall output is fixed to the output before the inching command is input.

[0028]

As described above, according to the present invention, when the inching command input is turned on, the lower limit of the torque control output of the closed loop tension control system is limited to the stall control output of the stall tension control system. Since the configuration is such that the control is applied, the brake works properly at the constant speed instant to feed the long material, eliminating the problem that the long material is entangled with the machine and cut, improving the quality control of tension control. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a tension control device as an embodiment.

FIG. 2 is a flowchart showing tension control by inputting an inching command in the embodiment.

FIG. 3 is a timing chart showing an operation pattern of the embodiment.

FIG. 4 is a configuration diagram showing an entire conventional processing apparatus for a long material.

FIG. 5 is a configuration diagram showing a conventional tension control device.

FIG. 6 is a flowchart showing tension control by inputting an operation stop command of a conventional tension control device.

FIG. 7 is a timing chart showing an operation pattern of a conventional tension control device.

FIG. 8 is a diagram showing inertial dependency of tension and output of a conventional tension control device.

FIG. 9 is a diagram showing an operating condition and a change in tension of a conventional tension control device.

[Explanation of symbols]

4 tension detector, 5 torque control output calculation means, 7 stall setting means, 8 stall storage means, 17 inching command input means, 18 lower limit limiting means, 19 inching changeover switch, 20 lower limit comparator.

Claims (1)

[Claims] 1. A long material during feeding operation by outputting a torque control output according to a difference between a detected tension during feeding operation of the long material and a preset tension set to the torque control actuator. Closed-loop tension control system that controls the tension of the long material to a preset tension, and stall control that controls the tension of the long material to a constant tension during the start or stop of the feeding operation of the long material. A stall tension control system that outputs the output to the torque control actuator,
Inching command input means that repeatedly starts and stops the feeding operation of long materials, and lower limit limiting means that limits the lower limit value of the torque control output of the closed loop tension control system to the stall control output of the stall tension control system by turning on the inching command input. A tension control device comprising: