JP3767128B2 - Sheet unwinding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet unwinding machine for unwinding a band-shaped sheet from a raw roll formed by winding the band-shaped sheet into a roll.
[0002]
[Prior art]
Generally, when a belt-like sheet on which a pattern is printed is unwound from an original roll mounted on the sheet unwinding machine, the position of the pattern is not always at a fixed position in the width direction of the belt-like sheet. And, for example, when unrolling a strip-shaped sheet printed with a pattern and cutting it into multiple strips in the longitudinal direction with a slitter at a position corresponding to the pattern, if the pattern on the strip-shaped sheet shifts in the width direction with respect to the cutting position, the defective product It becomes. Therefore, in order to unwind the belt-like sheet so as not to cause a defective product, conventionally, a driving device that moves the support device of the original fabric roll in the width direction of the original fabric roll, and a belt-like sheet that has been unwound from the original fabric roll A sensor that detects the position of the end of the register line or the pattern printed in the longitudinal direction, and a driving device that holds the end of the register line or the pattern on the belt-like sheet at a substantially constant position based on a detection signal from the sensor. A sheet unwinder equipped with a control device for controlling is used.
[0003]
[Problems to be solved by the invention]
However, in the sheet unwinding machine as described above, the belt-shaped sheet can be normally unwound when the unwinding speed becomes a certain level or more. It may malfunction, and the fabric roll support device may move greatly to its movement limit. In that case, the belt-like sheet is not cut at an appropriate position, so that the belt-like sheet unwound from when the drive device malfunctions until it stops becomes defective and unwinding can be resumed. It takes time and effort to return the original roll support device to a predetermined position. The cause of this malfunction is considered as follows.
[0004]
That is, the register line or the pattern printed in the longitudinal direction of the belt-like sheet may not be completely continuous over the entire length of all the belt-like sheets, and a part thereof may be interrupted. The length of the interrupted part of the pattern is not always constant. In such a case, if the unwinding speed of the belt-like sheet is high to some extent, the part where the register line or the picture is interrupted passes through the sensor instantaneously, so the sensor usually does not detect the interruption. Alternatively, even if a break is detected due to the sensitivity of the sensor, the sensor immediately detects the subsequent register line or pattern, so that the drive device returns to normal operation. However, when the unwinding speed of the belt-like sheet is slow, it takes a long time for the part of the register line or the pattern to pass through the sensor, so when the sensor detects the interruption, the control device indicates that the register line has shifted in the width direction. It judges and commands corrective action to a drive device, and while a subsequent register line or picture runs to the position of a sensor, a support device of an original fabric roll moves to the width direction of an original fabric roll. As a result, the register line or pattern on the belt-like sheet is completely deviated from the position that can be detected by the sensor, and the position of the subsequent register line or pattern is changed even after the part where the register line or pattern is cut off passes the sensor. Not detected. Therefore, the belt-like sheet does not return to the normal position, and the driving device continues the correcting operation to move the original fabric roll support device to the movement limit.
[0005]
Therefore, in the present invention, there is provided a sheet unwinding machine capable of preventing a malfunction of a driving device that moves the raw roll support device even if there is an interrupted portion in the register line or the pattern printed in the longitudinal direction of the belt-like sheet. The issue is to provide.
[0006]
[Means for Solving the Problems]
The present invention detects a position of an end of a drive line for moving a roll roll supporting device in the width direction of the roll, and a register line or a pattern printed in the longitudinal direction of a belt-like sheet rewound from the roll. A sensor and a control device that controls the driving device so as to hold the end of the register line or the pattern at a substantially constant position based on a detection signal from the sensor, and the intermittent state of the printed register line or the pattern is different. A speed detection circuit for detecting the running speed of the belt-like sheet in a sheet unwinding machine in which the rolls of the plurality of types of belt-like sheets are individually attached to the roll-feed support device and the belt-like sheet is unwound from the roll. when, may vary depending on the length of broken portions of said register lines or picture, proper of the belt-like sheet running speed when stopping the operation of the control device Includes a setting unit for setting the control device to stop the operation of the driving device when the detected values compared is less than the set value and the detected value set value of the setting unit and by the speed detecting circuit And a circuit that works. In the present invention, when the unwinding speed of the belt-shaped sheet from the sheet unwinding machine becomes smaller than the set value, a circuit for stopping the operation of the driving device works. Therefore, even if the register line or the pattern on the belt-shaped sheet is partially interrupted, Malfunctions can be prevented.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view according to an embodiment of the sheet unwinding machine of the present invention. The sheet unwinding machine includes a known raw roll support device 1, a driving device 2 that moves the raw roll support device 1 in the width direction of the raw roll R (left and right in FIG. 1), and the raw roll R A sensor 3 for optically detecting the position of the register line L printed in the longitudinal direction of the belt-like sheet S unwound from the belt, and based on a detection signal from the sensor 3, the register line L is held at a fixed position. and a control unit 4 for controlling the drive unit 2, further, in order to prevent malfunction of the drive unit 2, a speed detecting circuit 5 for detecting the traveling speed of the belt-like sheet S, the detection value is a set value due to the speed detection circuit 5 A circuit 6 is provided for operating the control device 4 so as to stop the operation of the drive device 2 when it is smaller.
[0008]
The original fabric roll support device 1 is configured such that a pair of stands 8 provided on a movable table 7 are engaged with chucks 9 disposed facing each other at both ends of a core C of the original fabric roll R. The roll R is supported at both ends. The movable base 7 is supported and guided by a known guide mechanism (not shown) provided on the base 10 and can move in the width direction of the original roll R. A movable guide roller 12 is supported on both ends of the frame 11 provided on the movable table 7.
[0009]
The driving device 2, the sensor 3, and the control device 4 are commercially available products. The driving device 2 is composed of a fluid pressure cylinder device, and the tip of the piston rod 2a is connected to the movable base 7, and one end of the cylinder body 2b is connected to a bracket 13 fixed to the base 10. The sensor 3 is supported by a support means (not shown) at a position fixed to the base 10.
[0010]
The belt-like sheet S is passed from the raw roll R through the movable guide roller 12 and the guide roller 14 to the feeding roller 15, and is unwound from the original roll R by rotating the feeding roller 15 with a motor 16. Is supplied downstream.
[0011]
The speed detection circuit 5 and the circuit 6 are configured using a commercially available programmable sequencer. The speed detection circuit 5 generates a pulse signal 17 that generates a pulse signal each time the output shaft of the motor 16 rotates by a predetermined angle. It comprises a known counting circuit that receives the pulse signal from and counts the pulse signal at predetermined intervals.
[0012]
The circuit 6 includes a setting unit 18, a comparison circuit 19 that determines whether the traveling speed V of the belt-like sheet S detected by the speed detection circuit 5 is smaller than the speed Vs set in the setting unit 18, and a comparison circuit 19. And an open / close circuit 21 for opening and closing the contact 20 for operating the control device 4 in response to the signal from The comparison circuit 19 issues a command signal to close the contact 20 to the switching circuit 21 when the detected traveling speed V is equal to or higher than the set speed Vs, and to the switching circuit 21 when the detected traveling speed V is smaller than the set speed Vs. A command signal is issued to open the contact 20. The control device 4 controls the driving device 2 when the contact 20 is closed, and stops the control when the contact 20 is opened.
[0013]
If the set speed Vs set in the setting unit 18 is too small, the drive device 2 is liable to malfunction. On the other hand, if it is too large, the length of the belt-like sheet S that travels while the drive device 2 is not activated becomes long. Therefore, when the register line L on the rewound belt-like sheet S is shifted in the width direction, the defective portion Becomes longer. The appropriate value of the set speed Vs can be changed according to the printing state of the register line L of the belt-like sheet S, the sensitivity of the sensor, the response characteristic of the control system for the unwinding position of the belt-like sheet S, and the like. Therefore, the setting unit 18 obtains and sets an appropriate value for the set speed Vs by trial and error. Then, by changing the set speed Vs, that is, the set value set in the setting unit 18, stable unwinding can be performed without changing the sensitivity of the sensor 3 with respect to several types of belt-like sheets having different register line intermittent states .
[0014]
In order to unwind the belt-like sheet S using the sheet unwinding machine shown in FIG. 1, after the sheet roll R is mounted on the sheet roll support device 1, it is between the start of unwinding and the drive device 2 is activated. In order to prevent the occurrence of defective parts as much as possible, the manual operation unit (not shown) provided in the control device 4 is operated as necessary to operate the driving device 2 so that the register line L is in a predetermined position. Position the device 1. Immediately after the start of unwinding, while the traveling speed V of the belt-like sheet S does not reach the set speed Vs, the contact 20 is open, and the control device 4 does not operate and the drive device 2 does not operate. Therefore, even if the register line L is partially interrupted, the drive device 2 does not malfunction.
[0015]
When the motor 16 accelerates and the travel speed V of the belt-shaped sheet becomes equal to or higher than the set speed Vs, the contact 20 is closed and the control device 4 is operated, and the drive device 2 is controlled by the control device 4, and the register line L is , Held in a substantially constant position.
[0016]
【The invention's effect】
According to the present invention, when the unwinding speed of the belt-like sheet from the sheet unwinding machine becomes smaller than the set value, the circuit that operates the control device to stop the operation of the driving device works, so that the register line or a part of the pattern is When the interrupted strip-shaped sheet is unwound from the raw roll, even if the unwinding speed of the strip-shaped sheet becomes low immediately after starting unwinding or just before stopping unwinding, it is possible to prevent malfunction of the driving device. In addition, by changing the setting value of the setting unit, it is possible to stably unwind several types of belt-like sheets having different register line or pattern intermittent states without changing the sensitivity of the sensor. Therefore, compared with the conventional sheet unwinding machine, the loss of the unrolled belt-like sheet can be greatly reduced, and work for resuming unwinding due to malfunction is unnecessary. Therefore, in the apparatus for processing the belt-like sheet unwound from the sheet unwinding machine of the present invention, the yield and the operation rate can be improved. Moreover, the sheet unwinding machine of the present invention can be configured by adding a relatively simple circuit to the conventional sheet unwinding machine.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a sheet unwinding apparatus according to the present invention.
[Explanation of symbols]
L register line R original fabric roll S belt-like sheet 1 original fabric roll support device 2 driving device 3 sensor 4 control device 5 speed detection circuit 6 circuit for operating the control device
18 Setting part 19 Comparison circuit 20 Contact 21 Open / close circuit

Claims (1)

A driving device for moving the original roll support device in the width direction of the original roll, a sensor for detecting the position of the register line or the end of the pattern printed in the longitudinal direction of the belt-like sheet rewound from the original roll, and A control device for controlling the driving device so as to hold the end of the register line or the pattern at a substantially constant position based on a detection signal from the sensor, and a plurality of types of strips having different printed register line or pattern intermittent states. In the sheet unwinding machine, in which each sheet roll is individually mounted on the sheet roll support device, and the band sheet is unwound from the sheet roll, a speed detection circuit for detecting the traveling speed of the band sheet, and the register Set an appropriate value for the belt-like sheet running speed when stopping the operation of the control device, which can change depending on the length of the line or pattern where the interruption occurs. It includes a setting unit exerts the control so as to stop the operation of the driving device when the detected value is compared with the detection value by the velocity detection circuit with a set value of the setting unit is smaller than the set value circuit And a sheet unwinding machine.

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