JP2017190195A - Belt-like sheet feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a belt-like sheet, on which a pattern is printed, so as not to deviate with respect to a slitter and automatically find out the belt-like sheet whose variation in the width of the pattern is too large so that an operator can be notified of it.SOLUTION: A first optical sensor 4 detects the magnitude of deviation of a reference line L0 on a belt-like sheet S0, and a second optical sensor 5 detects the magnitude of deviation of a side edge L1 of a pattern. Alarm signal generation means 7 calculates an increase/decrease amount of an interval w0 between the reference line L0 and the side edge L1 of the pattern based on each detection signal and issues an alarm signal to alarm means 6 when the increase/decrease amount exceeds a set value. Detection signal switch means 8 switches between the first optical sensor 4 and the second optical sensor 5 to output one of the detection signals. A control device 9 operates an actuator 3 for moving an original fabric roll support base 2 so that the deviation of the belt-like sheet is eliminated, on the basis of an output signal from the detection signal switch means 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a belt-like sheet supply device that feeds a belt-like sheet such as a plastic film on which a pattern is printed from a raw roll to a slitter.

  The belt-like sheet supply device as described above is provided in a belt-like sheet processing machine provided with a slitter. As such a machine, there is a slitter rewinder. In the slitter rewinder, a winding roll of the divided strip-shaped sheet is formed by winding the strip-shaped sheet supplied from the sheet supply apparatus while being divided into a plurality of strips by the slitter. The belt-like sheet fed from the raw fabric roll is often shifted in the width direction with respect to the slitter, and when the belt-like sheet is supplied in this state, the belt-like sheet is moved from the required cutting position according to the pattern in the width direction. The band-like sheet is cut in the longitudinal direction at a position shifted to, and the belt-like sheet becomes a defective product. Therefore, the conventional belt-like sheet supply apparatus is provided with a raw roll support for supporting the raw roll, as disclosed in, for example, JP-A-11-116113, in order to prevent the belt-like sheet from shifting in the width direction. An actuator that can move the table in the width direction of the belt-like sheet, an optical sensor that detects a reference line printed in the longitudinal direction of the belt-like sheet, and detects the amount of deviation of the detected reference line, And a control device that operates the actuator based on a detection signal from the optical sensor so as to eliminate the displacement of the belt-like sheet with respect to the slitter.

  By the way, the pattern printing on the belt-like sheet is usually performed by a rotary printing press. In a rotary printing machine, a plain belt-like sheet is rewound from an unwinding unit, supplied to the plate cylinder unit, and printed on the plate cylinder unit, and the printed belt-like sheet is wound up by the winding unit to take up the roll. Form. And this winding roll is supplied to a slitter rewinder as an original fabric roll. The belt-like sheet of the original fabric roll is desirably printed with a uniform pattern over its entire length, but sometimes an original fabric roll with poor print quality is supplied to the slitter rewinder.

  For example, in a rotary printing machine, the tension (elongation) of the belt-like sheet passing through the plate cylinder may change due to the unwinding tension of the belt-like sheet at the unwinding portion or the inappropriate winding tension at the winding portion. If the tension of the belt-like sheet when it passes through the plate cylinder is excessively large, the pattern is printed on the belt-like sheet in a state of being greatly contracted in the width direction as compared with the normal state. However, at this time, the printed pattern is somewhat enlarged in the width direction of the belt-like sheet as compared with the pattern printed at other appropriate tensions. The width of the pattern does not become uniform over the entire length of the belt-like sheet.

  When using a slitter rewinder equipped with a conventional belt-like sheet supply device to process a roll of belt-like sheets with variations in the pattern width as an original roll, the reference line printed on the belt-like sheet is detected by an optical sensor. However, even if the strip sheet does not shift in the width direction with respect to the slitter and is supplied to the slitter with an appropriate tension, and the slitter blade is placed at an appropriate cutting position according to the pattern, it is supplied to the slitter. In the region where the width of the printed pattern is excessive, the strip-shaped sheet thus formed is cut in the longitudinal direction at a position shifted in the width direction from an appropriate cutting position corresponding to the pattern. The belt-shaped sheet take-up roll that has a region cut at an inappropriate position with respect to the pattern is originally a defective product and should not be shipped. However, the operator always monitors the cutting state of the belt-shaped sheet that is running. It is virtually impossible to find an inappropriate cut part, and it is extremely difficult to know the presence of an improper cut part from the appearance of the take-up roll. May be shipped as a product without noticing. However, in that case, an improper cut portion of the belt-like sheet is discovered in the bag making process or packaging process at the shipping destination, which can be a big problem in quality assurance.

JP 11-116113 A

  Therefore, the present invention can supply a strip-shaped sheet on which a pattern is printed so as not to be displaced with respect to the slitter, and can automatically find a strip-shaped sheet having an excessively large variation in the width of the pattern and notify the operator. The challenge is to make it.

  The present invention relates to a roll roll supporting the roll roll in a belt-shaped sheet supply apparatus that feeds a strip or sheet with a single or multiple stripes and a pattern or a pattern printed simply from the roll into a slitter. An actuator that can move the support base in the width direction of the belt-like sheet, and one reference line of the one reference line or a plurality of reference lines, a side edge of the pattern, or a specific pattern in the pattern is detected. A first optical sensor for detecting the magnitude of deviation of the detection target as a target, and the first optical sensor disposed at a distance from the first optical sensor in the belt-like sheet width direction. A second optical sensor for detecting a deviation amount of the detection target using the reference line, a side edge of the pattern, or a specific pattern different from the detection target by the sensor as a detection target; and the first optical sensor Calculating an increase / decrease amount of an interval between a detection target by the first optical sensor and a detection target by the second optical sensor based on a detection signal from the second optical sensor and a detection signal from the second optical sensor; When the calculated increase / decrease amount of the interval exceeds a set value, an alarm signal generating means for issuing an alarm signal to the alarm means, a detection signal from the first optical sensor, and a detection signal from the second optical sensor Detection signal switching means capable of switching and outputting either one, and a control device for operating the actuator based on the output signal of the detection signal switching means to operate the actuator so as to eliminate the displacement of the belt-like sheet with respect to the slitter. It is characterized by.

  According to the present invention, when the strip sheet is processed while being divided by the slitter, the strip sheet can be supplied to the slitter so as not to be displaced in the width direction, and the width of the pattern printed on the strip sheet can be increased. Due to improperness, the planned cutting position corresponding to the pattern does not match the actual cutting position by the slitter, so that a belt-like sheet that becomes a defective product can be automatically found out and the alarm means can be activated to notify the operator. Then, the worker who received the warning immediately stops the processing machine, so that waste of time and energy due to processing of defective products can be greatly reduced, and a defective belt-like sheet with an area cut at an inappropriate position It becomes possible to prevent the take-up roll from being shipped accidentally.

  Further, a conventional optical sensor as a second optical sensor, a detection signal switching means that can be configured at low cost with a single changeover switch, and an alarm signal generating means that can be configured simply are provided. Since it only needs to be added to the belt-like sheet feeding device, the existing conventional belt-like sheet feeding device can be modified to the belt-like sheet feeding device of the present invention relatively easily and at a low cost.

  Further, since the detection signal from the first optical sensor and the detection signal from the second optical sensor can be easily switched by the detection signal switching means, the belt-like sheet has a different reference line or pattern arrangement. The first optical sensor and the second optical sensor may be rearranged so that the movement distance becomes as short as possible according to the arrangement, for example, the arrangement of the reference line is the right edge of the belt-like sheet. Even if it changes from near to the left edge, it is no longer necessary to move a long distance corresponding to substantially the entire width of the belt-like sheet as in the prior art, and the arrangement work of the optical sensor accompanying the change of the pattern of the belt-like sheet becomes easy. The work time can be shortened.

FIG. 1 is an explanatory diagram of a belt-like sheet supply apparatus according to an embodiment of the present invention.

  The belt-like sheet supply device shown in FIG. 1 feeds the belt-like sheet S0 from the original fabric roll R0 and supplies it to the slitter 1, and moves the original fabric roll support base 2 that supports the original fabric roll R0 in the belt-like sheet width direction. The first optical sensor 4 for detecting the reference line L0 printed on the belt-like sheet S0 and detecting the magnitude d1 of the deviation of the reference line L0, and the first optical sensor. A second edge is detected by detecting the side edge L1 of the pattern P1 printed on the belt-like sheet S0 and spaced apart in the widthwise direction of the belt-like sheet 4 to detect the deviation d2 of the side edge L1. Based on the detection signal from the optical sensor 5, the first optical sensor 4, and the detection signal from the second optical sensor 5, the increase / decrease amount of the interval w0 between the reference line L0 and the side edge L1 of the pattern P1 is changed. Calculate and its calculated interval When the increase / decrease amount exceeds the set value, the alarm signal generating means 7 for outputting an alarm signal to the alarm means 6 and the detection signal from the first optical sensor 4 and the detection signal from the second optical sensor 5 are switched. Detection signal switching means 8 capable of outputting either one and a control device 9 for operating the actuator 3 so as to eliminate the displacement of the belt-like sheet S0 with respect to the slitter 1 based on the output signal of the detection signal switching means 8. ing.

  In this embodiment, the belt-like sheet supply device is provided in a slitter rewinder, and the belt-like sheet R0 supplied to the slitter 1 is divided into a plurality of strips when passing through the slitter 1, and the divided belt-like sheet S is Each is wound into a roll shape by a known winding device (not shown) to form a winding roll. When the belt-like sheet S0 is supplied, the raw roll R0 is rotatably supported by the raw roll support base 2, and the belt-like sheet S0 is fed by a feeding roller 10 that is rotationally driven at a predetermined speed or other driven rollers (not shown). The tension of the belt-like sheet S can be adjusted to a required magnitude by a known braking device (not shown) such as a powder brake provided on the raw fabric roll support base 2. . In addition to the reference line L1 and the pattern P1, the patterns P2, P3, and P4 are printed on the belt-like sheet S0, and the slitter 1 has a plurality of slits arranged at predetermined cutting positions according to the pattern of the belt-like sheet S. The belt-like sheet S0 that is made up of the blade 11 and runs while being cut is cut by the blade 11 in the longitudinal direction. The raw roll support base 2 is provided so as to be slidable along a rail 12 parallel to the width direction of the belt-like sheet so that the supply position of the belt-like sheet S0 to the slitter 1 can be changed.

  The first optical sensor 4 and the second optical sensor 5 are each a line, figure, pattern or pattern printed on a belt-like sheet by a solid-state imaging device such as a CCD image sensor or a CMOS image sensor, or a photodiode array. It can optically detect a detection target such as a color and output a detection signal corresponding to the magnitude of the shift of the detection target, that is, the distance from a preset reference position to the position of the detection target. It is a commercial product. The belt is fixedly disposed near both side edges of the belt-like sheet S0 passing over the guide roller 13, and the reference line L0 and the side edge L1 of the pattern P1 are detected momentarily while the belt-like sheet S0 is being supplied. In this embodiment, when the detection objects L0 and L1 are displaced in the direction in which the width of the belt-like sheet S0 is increased with respect to the reference position, the magnitude of the displacement is a positive value and is shifted in the decreasing direction. If it is, it will be a negative value. Also, for example, even if the detection target such as a line or a figure is intermittently printed in the longitudinal direction of the belt-like sheet and the detection of the detection target is interrupted for a moment, until the next detection target is detected, A detection value of the magnitude of deviation based on detection can be held.

  If the maximum value of the increase / decrease amount of the interval between the reference line L0 and the side edge L1 of the pattern P1 set in the alarm signal generating means 7 is ds, the alarm signal generating means 7 stores the maximum value ds of the increase / decrease amount. The magnitude d1 of the deviation of the reference line L0 detected by the first optical sensor 4 and the side edge L1 of the pattern P1 detected by the second optical sensor 5 every time during the supply of the belt-like sheet S0. Is added to calculate the amount of increase / decrease (d1 + d2) between the reference line L0 and the side edge L1 of the picture P1, and the amount of increase / decrease (d1 + d2) and the stored maximum value ds are calculated. In comparison, when (d1 + d2)> ds, the alarm signal sw is output. In this embodiment, the storage unit for the maximum value ds and the calculation unit for the increase / decrease amount of the interval between the detection targets L0 and L1 are configured in the programmable sequence controller provided for controlling the feeding operation of the belt-like sheet S0. ing. The alarm means 6 may employ a known device such as an alarm light that blinks red light or an alarm buzzer that emits an alarm sound as long as it can generate an alarm upon receiving an alarm signal sw.

  In this embodiment, the detection signal switching means 8 comprises a changeover switch, and in FIG. 1, a detection signal from the first optical sensor 4 is input to the control device 9. The control device 9 outputs a control signal sc for operating the actuator 3 so that the reference line L0 does not shift with respect to the slitter 1.

  The maximum value ds of the increase / decrease amount of the interval between the detection targets L0 and L1 may be obtained as follows. If the allowable value of the deviation between the scheduled cutting position corresponding to the pattern and the actual cutting position is da, the allowable value da is obtained in advance, for example, experimentally or experimentally. When the distance between the reference line L0 and the side edge L1 of the pattern P1 is w0 and the distance between the reference line L0 and the cutting position farthest from the reference line L0 is w1, the calculation is performed as ds = w0 / w1 × da. In the case of FIG. 1, since w0 and w1 are equal, a value equal to the allowable deviation da is set as the maximum value ds of the increase / decrease amount of the interval between the detection targets L0 and L1.

  The position of the pattern or reference line printed on the belt-like sheet S0 changes, for example, the detection target by the first optical sensor 4 becomes the same reference line L0 as shown in FIG. 1, and the detection by the second optical sensor 5 When the target is the right edge L2 of the pattern P2 in FIG. 1, the second optical sensor 5 is disposed at the center of the strip sheet S0. The distance between the reference line L0 and the right edge L2 of the pattern P2 is equal to w2, and is approximately half the distance w1 between the reference line L0 and the cutting position farthest from the reference line L0. Therefore, the distance between the detection targets L0 and L2 The maximum value ds of the increase / decrease amount is approximately half of the allowable deviation da, and the maximum value of the increase / decrease amount is set in the alarm signal generating means 7.

  Further, when the reference line L0 is printed at a location near the left edge of the belt-like sheet S0 contrary to that shown in FIG. 1, the reference line is set as a detection target by the second optical sensor 5. At the same time, for example, the right edge of the pattern P4 is set as a detection target by the first optical sensor 5, and the output signal from the detection signal switching means 8 to the control device 9 is changed from the detection signal by the first optical sensor 4 to the second. It switches to the detection signal by the optical sensor 5.

  In the present invention, when the reference lines are arranged in the vicinity of both edges of the belt-like sheet, the first optical sensor uses one reference line and the second optical sensor uses the other reference line as a detection target. do it. When the reference line is not printed on the belt-like sheet and only the pattern is printed, the first optical sensor and the second optical sensor detect the side edges of the different patterns. If it is possible to detect a specific pattern among the patterns, for example, a figure, light and dark, a color, etc., a specific pattern different from each other may be set as a detection target. A specific pattern may be detected, and the other one may detect a side edge of the pattern. In addition, in order to automatically stop the supply of the belt-like sheet and minimize the loss, an alarm signal output from the alarm signal generating means is used to instruct the motor speed control circuit that drives the feeding roller to stop driving. You may comprise as follows.

P1, P2, P3, P4 Pattern L0 Reference line
L1, L2 Pattern side edge R0 Original fabric roll S0 Strip sheet 1 Slitter 2 Original fabric roll support 3 Actuator 4 First optical sensor 5 Second optical sensor 6 Alarm means 7 Alarm signal generating means 8 Deviation signal switching 8 Means 9 Control device 10 Feeding roller

Claims (1)

  In a belt-shaped sheet supply device that feeds a strip sheet on which one or a plurality of strips and a pattern or simply a pattern is printed out from a sheet roll, and supplies it to a slitter, the sheet roll support base that supports the sheet roll is strip-shaped. An actuator that can move in the sheet width direction and one of the reference line or one of the plurality of reference lines, a side edge of the pattern, or a specific pattern in the pattern as a detection target. A first optical sensor for detecting the magnitude of the deviation of the object, and a detection object by the first optical sensor arranged at an interval in the belt-like sheet width direction with respect to the first optical sensor A second optical sensor for detecting a difference between the reference line different from the reference line, a side edge of the pattern, or a specific pattern, and detecting a displacement amount of the detection object, and detection from the first optical sensor Based on the signal and the detection signal from the second optical sensor, an increase / decrease amount of the interval between the detection target by the first optical sensor and the detection target by the second optical sensor is calculated, and the calculated interval When the amount of increase / decrease exceeds a set value, the alarm signal generating means for issuing an alarm signal to the alarm means, the detection signal from the first optical sensor, and the detection signal from the second optical sensor are switched to And a control device that operates the actuator so as to eliminate a displacement of the belt-like sheet with respect to a slitter based on an output signal of the detection signal switching means. Band-shaped sheet supply device.

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