JPS61217448A - Apparatus for stably transporting sheet material - Google Patents

Abstract

PURPOSE:To enable stable running of a sheet material without meandering by providing a controller device to sequentially compare and correct an operation signal sent to a driving device according to a signal from a meandering detection sensor to control the acting amount in such a manner as to converge. CONSTITUTION:According to signals from meandering detection sensors 10, 11, a designated amount of driving signals are sent to a pulse motor 6 to turn a roll shaft 4 in a designated direction for a preset fixed amount, and the second driving amount is calculated from the amount of time taken from the first driving condition to the time the sensors 10, 11 change from on-state to off-state. Sequentially, the last driving amount is similarly compared and corrected to calculate, and according to an obtained value, the roll 2 is driven in an angle of theta in the opposite directions alternately, so that the driving amount is gradually decreased to converge to an angle theta of the roll in such a manner that the sheet material 1 can stably run. Thus, the angle of the roll can be controlled to the optimum angle not to cause meandering of a sheet material by incorporating a program in a controller.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention automatically corrects deviation in the width direction of a traveling sheet-like object, and places the sheet-like object in the most stable position where meandering does not occur. The present invention relates to a stable transport device for sheet-like materials that can be moved.

[Prior Art] In order to correct deviation or meandering in the width direction of a traveling sheet-like object, a method of tilting a transport roll of a sheet-like object is conventionally known. In other words, it is generally known that when the tension of a sheet-like object changes in the width direction on the transport roll, the sheet-like object shifts in the width direction in the direction where the tension becomes stronger. However, this method is used to correct the misalignment of the sheet by forcibly tilting the axis of the transport roll to forcibly create a tension difference in the width direction of the sheet.

A conventional device for correcting the misalignment of a sheet-like object using such a method includes, for example, a sensor that detects the position of the edge of the sheet-like object and detects the misalignment of the sheet-like object, and a sensor that detects the misalignment of the sheet-like object by detecting the position of the end of the sheet-like object. It consists of a drive device that uses electrical or hydraulic power to tilt the axis of the shaft. Then, based on the signal from the sensor, the roll is tilted by the drive device in a direction that provides a vector that moves the sheet-like object in a direction opposite to the direction in which the sheet-like object is offset.

[Problems to be Solved by the Invention] However, in the conventional device as described above, the roll is simply tilted by the drive device each time based on a signal from the sensor, so the sheet-like object may not move in the correction direction due to the roll tilt. There is a problem in that the sheet-like object may become skewed again in the opposite direction, and if this is corrected, it will be deviated again in the original direction, causing the sheet-like object to meander and be unable to run stably.

In order to solve the above-mentioned problems, the present invention is an apparatus for correcting the misalignment of a sheet-like object using the inclination of a roll, which not only corrects the misalignment of the sheet-like object in the width direction, but also To automatically and quickly set the inclination angle of a roll to an optimum angle to obtain a stable running state of a sheet-like object without causing deviation or meandering.

[Means for solving the problem] The stable conveyance device for sheet-like materials of the present invention that meets this purpose is as follows:
A roll that can convey a traveling sheet-like object and tilt its axis in a direction in which the tension at one end is stronger than the tension at the other end when looking at the tension at both ends of the sheet-like object in the width direction. a drive device that sets the angle of the inclination direction of the roll; a meandering detection sensor that detects meandering in the width direction of the traveling sheet-like object; and a meandering detection sensor that detects the meandering of the traveling sheet-like object in the width direction; a controller device that starts sending an actuation signal to the drive device, sequentially compares and modifies the actuation signal to the drive device, and controls the amount of actuation of the drive device based on the actuation signal in a direction to converge.

[Operation] In such a device, the roll for conveying the sheet-like material is forcibly driven at an angle, so that the tension of the sheet-like material on the roll is changed in the width direction, and the tension is increased in the direction where the tension becomes stronger. The sheet-like material is forcibly gathered together, and the offset in the width direction is corrected. The driving device for this tilting drive is started based on a signal from the meandering detection sensor. Up to this point, it is essentially the same as the conventional device, but in the present invention, the drive amount by the drive device is sequentially compared with the previous operation and corrected. Then, the inclination angle of the roll is gradually and automatically converged to an optimal angle, that is, an angle at which the sheet-like object can run in a stable position without shifting in any direction in the width direction.

Embodiments] Preferred embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a stable conveyance device for a sheet-like object according to an embodiment of the present invention, and numeral 1 in the figures indicates a sheet-like object. As shown in FIG. 2, the sheet-like material 1 is
It is conveyed from roll 2 to roll 3. This roll 2.
3, in this embodiment, the upper roll 2 is a roll that is driven in an inclined manner.

As shown in FIG. 1, the roll 2 is rotated around an axis 5 perpendicular to the roll axis 4 at one end of the roll 2, and the angle θ of the roll axis 4 with respect to the sheet-like material traveling direction is O.
The angle can be changed from o to 18o. However, in order to correct the deviation of the sheet-like object 1, it is not actually necessary to incline θ to Oo or 180 degrees, so as described later, for example, the initial angle is set to be perpendicular to the direction of movement of the sheet-like object. Set to θ-90°, maximum angle is 1°Oo,
The minimum angle may be set to about 80°.

As shown in FIG. 3, the roll 2 has its shaft end rotatably connected to the shaft of a pulse motor 6, and the rotation of the pulse motor 6 controls the above-mentioned angle θ. Therefore, the pulse motor 6 constitutes a drive device that sets the inclination angle θ of the roll 2. The shaft 7 of the pulse motor 6 is
It is connected to an encoder 9 attached to the side of the frame 8 facing the pulse motor 6, and the encoder 9 emits a signal corresponding to the rotation angle of the pulse motor 6, that is, the inclination angle θ of the roll shaft 4.

Meandering detection sensors 10.11 are provided at positions on both sides of the sheet-like material 1 in the width direction, in this embodiment, at positions on the upstream side of the roll 2, for detecting meandering of the traveling sheet-like material 1 in the width direction. It is being This meandering detection sensor 10.11 may be a contact type when the sheet-like object 1 is cloth or the like, but a non-contact type when the sheet-like object 1 is a film or the like.
For example, a photoelectric reflection type or an ultrasonic type is preferable, and if an image sensor is used, it becomes possible to continuously and precisely control the roll inclination angle, which will be described later.

Sensors 12 and 13 that similarly detect the edge of the sheet-like object 1 are provided at positions further outside the meandering detection sensors 10 and 11 in the width direction of the sheet-like object.

The sensors 12 and 13 are sensors for emergency operation that detect when the sheet-like object 1 has meandered significantly more than the normal meandering amount.

Meandering detection sensor 10.11 and emergency operation sensor 12
．． 13 is connected to a controller device 14, and these signals are input. In addition, the controller device 14
is connected to an encoder 9, from which a signal corresponding to the angle θ of the roll shaft 4 is input. Further, the controller device 14 is connected to a pulse motor 6, and the rotation angle of the pulse motor 6 is controlled by a signal from the controller device 14.

The controller device 14 has a built-in program as shown in FIG. For example, based on the signal from the meandering detection sensor 10.11, a predetermined amount of drive signal is sent to the pulse motor 6 to first change the angle of the roll shaft 4 in a predetermined direction by a predetermined angle; 1VA
The second driving amount is calculated from the driving state of the eye, for example, from the time from the on state to the off state of the sensor 10. A program is incorporated in which the angle θ of the roll 2 is alternately driven in opposite directions in accordance with the set value, and the drive amount is gradually reduced until it converges to the O-roll angle θ at which the sheet-like material 1 can run stably. ing.

The operation of the apparatus for stably conveying a sheet-like object configured as described above will be explained below.

If the sheet-like object 1 shifts to the right in the running direction in FIG. 1, the meandering detection sensor 10 is turned on, and if it shifts to the left, the sensor 11 is turned on and detects the shift.

The process will be explained below according to the flowchart shown in FIG.

For example, if the initial angle of the roll 2 is set to approximately 90°, when the sensor 10 is turned on, the pulse motor 6 is operated in response to a command signal from the controller device 14, and the roll angle θ is set to the minimum angle (for example, 80°). °)
The roll 2 is then tilted in the direction B in FIG. Then, on the roll 2, the tension in the width direction of the sheet-like material 1 becomes stronger on the left side in FIG. 1, and the sheet-like material 1 is shifted to the left side, correcting the offset. At this time, a timer measures the time from when the sensor 10 turns on and starts the above-described operation until the sensor 10 turns off. Then, as the next operation amount, the initial angle (for example, 90°)
and the minimum angle (for example, 80°), the roll inclination angle θ calculated from the above-mentioned measurement time using the formula shown in the flowchart is set. This second operation amount is calculated to be small when the time from on to off of the sensor 10 is long, and to be large when it is short. That is, sensor 1
When the time from ON to OFF of 0 is long, the optimum angle to be found is on the minimum angle side, and when the time is short, it is on the initial angle side.

The second operation is performed according to the amount of operation calculated in this way. Before this second operation, the amount of operation is stored and the timer is returned to O. and,
When the sensor 10 is turned on again in this second operation, the sensor 1
0 off to on amount, depending on the measured time, 3
The amount of movement for the second time is calculated, and the movement is executed. By repeating such operations, the amount of change in the angle of the roll 2 gradually becomes smaller, and the angle of the roll 2 gradually becomes the optimum angle, that is, neither the sensor 10 nor the sensor 11 are turned on, and the sheet-like object 1
approaches the angle at which it can run stably without meandering.

The control to the optimum angle as described above is similarly performed on the sensor 11 side. When the sensor 11 is turned on, the roll 2 is first rotated to the maximum angle (for example, 100") and the sheet material 1 is pulled in the opposite direction to the sensor 11. At the same time, when the sensor 11 is turned off, the memorized Roll 2 is set to a new angle calculated using the formula shown in the flowchart from the angle and timer measurement time.Then, the same operations as those described above are repeated to converge to the optimum angle.

Note that the sensors 12.13 are for emergency use, and when these sensors 12.13 are turned on, the pulse motor is rotated at a rapid speed to prevent the sheet-like material 1 from coming off the roll 2, or Stop transport.

Moreover, the control to the optimum angle of the roll 2 is not limited to the method shown in FIG. 4, but any control method that can memorize the amount of correction and calculate the next amount of correction based on it may be used. good. Further, in the above embodiment, the initial angle was set to 90°, but this initial angle may be set relatively roughly since this control gradually converges to the optimum angle.

Furthermore, if a sensor that can continuously detect the positions of both ends of a sheet-like object in a non-contact manner, such as an image sensor, can be used to control the optimum angle more accurately and quickly. Not even.

Further, in the above embodiment, a pulse motor is used for controlling the roll angle, but a cylinder 15 or the like may be used as the drive device, for example, as shown in FIG. 5. In the structure shown in FIG. 5, one end of the roll 16 has a structure that can support rotation even if the roll 16 is tilted, such as a spherical bearing 17, and the other end has a cylinder 15 for detecting the tilt angle of the roll 16. A linear encoder 18 or the like may be provided.

Further, in the above embodiment, the roll 2 is inclined in the direction of the running plane of the sheet-like material 1, but for example, as shown in FIG. Even if it is tilted in the vertical direction, the same function as in the previous embodiment can be obtained.

[Effects of the Invention] As explained below, according to the present invention, the widthwise offset correction control of the sheet-like object is performed by controlling the inclination angle of the roll, and the controller is controlled based on the signal from the meandering detection sensor. Since the roll angle is controlled to converge sequentially based on signals from the device, by incorporating an appropriate program into the controller device, the roll angle can be easily and quickly adjusted to the optimal angle that does not cause meandering of the sheet material. The effect is that it can be controlled to

In addition, since the above control sequentially converges the roll angle, it is possible to reliably prevent hunting in the width direction of the sheet material, which was a problem with conventional devices, and in the control process, Since the control amount gradually decreases, the present invention can be easily applied to sheet-like objects traveling at high speeds.

[Brief explanation of drawings]

FIG. 1 is a plan view of a stable conveyance device for sheet materials according to an embodiment of the present invention, FIG. 2 is a side view of the area around the rolls showing the installation location of the rolls in FIG. 1, and FIG. 3 is the same as in FIG. 1. Fig. 4 is a flowchart of a program incorporated in the controller device of Fig. 1; Fig. 5 is a plan view of a stable sheet conveyance device according to another embodiment of the present invention. , FIG. 6 is a side view of the roll and its surroundings showing a roll inclination direction different from that of the device of FIG. 1. 1...Sheet-like material 2.16.19...Roll 4...Roll shaft 6...Pulse motor 9 as a drive device...
... Encoder 10.11 ... Meandering detection sensor 14 ...
- Controller device 15...Cylinder 18 as a drive device...
... Linear encoder θ ... Roll inclination angle ↑ ■ 1: Sheet-like object 2: Roll 4: Roll axis 6: Drive device 10.11: Meandering detection sensor 4: Controller device Fig. 5

Claims (1)

[Claims] (1) It is possible to convey a traveling sheet-like object and tilt the axis in a direction in which the tension at one end is stronger than the tension at the other end when looking at the tension at both ends of the sheet-like object in the width direction. a drive device that sets the angle of the inclination direction of the roll; a meandering detection sensor that detects meandering in the width direction of the traveling sheet-like object; a controller device that starts sending an actuation signal to the drive device, sequentially compares and modifies the actuation signal to the drive device, and controls the amount of actuation of the drive device based on the actuation signal in a direction to converge. Stable transport device for sheet materials.