JPH11292363A - Sheet lateral displacement-correcting method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct lateral displacement of a long sheet by a single detection sensor. SOLUTION: A detection sensor 2 to detect a side edge (s) of a long film (f) is provided in a carrying passage of the long film (f), and when a continuity length of a detection/non-detection signal of the detection sensor 2 exceeds a preset value, a lateral displacement-correcting motor 7 is reversely actuated based on the signal, so the long sheet (f) is displaced along the width direction from a detected position in the non-detection direction, or from a non-detection position in the detection direction, thereby its lateral displacement is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method and an apparatus for correcting lateral deviation of a sheet.

[0002]

2. Description of the Related Art In order to suppress the formation of an abnormal bag or the formation of an abnormal printed matter, a device for conveying long paper or a long film is usually provided with two sets of photoelectric detection sensors in a part of its path. Means are provided in the width direction to adjust the displacement of the long sheet in the width direction such that one of these detection sensors is in a non-detection state, that is, a light incident state, and the other is in a detection state, that is, a light blocking state. Have been.

However, such an adjustment mechanism not only requires two sets of photoelectric detection sensors, but also has a problem that the adjustment width of the long sheet is limited by the arrangement interval of the photoelectric detection sensors. doing.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is an object of the present invention to provide a new sheet lateral blur correction method and apparatus capable of arbitrarily and easily adjusting lateral blur of a long sheet by using one set of photoelectric detection sensors.

[0005]

That is, the present invention provides a method for correcting a lateral deviation of a sheet to achieve the above object, by detecting a sheet by a detection sensor disposed in a region where a side edge of a long sheet passes.・ Detection based on non-detection signal
When the duration of the non-detection signal exceeds a preset time, the long sheet is displaced in the width direction from the detection position to the non-detection direction and from the non-detection position to the detection direction. In addition, as a lateral deviation correcting device for a sheet, a sheet detecting sensor is disposed in a region where a side edge of a long sheet passes, and a continuation time of a sheet detecting signal by the detecting sensor exceeds a preset time. A control means is provided for displacing the long sheet in the width direction from the detection position to the non-detection direction and from the non-detection position to the detection direction in response to a signal output at this time.

[0006]

Embodiments of the present invention will be described below. The drawings show an embodiment of the present invention applied to a film feeder of a packaging machine.

In the drawing, reference numeral 1 denotes a bracket provided on one side of a long film transport path so as to sandwich a side edge of the film f. The bracket 1 has a light emitting element at a portion where the side edge s of the film f passes. A photoelectric detection sensor 2 for detecting a side edge s of the film f, which is composed of a photodetector and a light receiving element, is provided.

Reference numeral 5 denotes a roller for correcting a lateral blur of the long film f. A movable rod 6 for supporting one shaft end of the roller 5 is used for correcting a lateral blur operated by a signal from a control device 10 described later. The motor 7 is configured to be displaced in a direction perpendicular to the axis so as to correct the lateral blur of the long film f being conveyed.

On the other hand, reference numeral 10 in the figure denotes a motor 7 for correcting lateral blur based on the detection result of the photoelectric detection sensor 2.
The control device 10 controls a detection / non-detection signal (OFF / ON) from the photoelectric detection sensor 2.
Signal), this signal is sent to the state duration measuring means 12.
State determination means 11 which outputs a reset signal to the state duration measurement means 12 when the detection / non-detection signal is inverted, and the duration of one of the signals from the state determination means 11 Is calculated based on the clock pulse and output to the comparing means 13. The state duration measuring means 12 counts the counted value and the setting means 14.
A comparison means 13 for comparing the set value signal from the control means 13 with a set value signal and outputting a switching signal to the signal switching means 15 when the set value is exceeded, a signal from the comparison means 13 and detection / non-detection from the state determination means 11 Signal switching means 15 for inverting the signal to change the rotation direction of the lateral blur correction motor 7 from the detected position to the non-detected direction and from the non-detected position to the detected direction when receiving the signal.

In the figure, reference numeral 16 denotes signal switching means 1
Reference numeral 17 denotes a motor control means for controlling the lateral shake correction motor 7 based on a signal from the control unit 5.
4 shows external setting means for appropriately changing the setting value of No. 4.

Next, a description will be given of an operation for correcting the lateral blurring of the long film f by the apparatus having the above-mentioned configuration with reference to FIGS.

When the feeding of the long film f is started (step b), the photoelectric detection sensor 2 disposed on one side of the transport path determines whether the light is transmitted from the light emitting element to the light receiving element. Detect the side edge of f (Step b)
A detection / non-detection signal, that is, an OFF or ON signal is output to the state determination means 11 (step C).

On the other hand, this signal is inputted to the state duration measuring means 12 via the state judging means 11 and the duration is counted as the number of pulses. If the duration of the detection signal exceeds the set value after the comparison, the switching signal is output to the signal switching means 15 from here.

Therefore, as shown in FIG. 2 (b), during normal film transport such that the side edge s of the long film f passes through the detection area of the detection sensor 2, the setting from the detection sensor 2 is performed. Short ON / OF without exceeding the value
Since the F signal is output in a pulse shape, the switching signal from the comparing means 12 is not output, and the control device 10
Long film f without chattering
Continue normal feeding operation of (Step d).

On the other hand, as shown in FIG. 2A, in the detection state of the long film f in which light from the light emitting element is blocked by the long film f and a low-level signal is output from the light receiving element, When the counted number of pulses exceeds the set value, the switching signal from the comparing means 13 is output from the signal switching means 1.
5 and, on the other hand, the signal switching means 15 sends a signal to the motor control means 16 from the detection position to the non-detection direction and from the non-detection position to the detection direction By outputting a signal for switching to the reverse direction and rotating the lateral blur correction motor 7 in the opposite direction (step E), the direction of the roller 5 is slightly displaced in the direction of arrow A, and the side edge s of the long film f is Displacement is performed outside the detection area of the detection sensor 2 to correct the lateral blur.

On the other hand, as shown in FIG. 2 (c), when the side edge s of the long film f passes through a position outside the detection area of the detection sensor 2, When the duration of the non-detection signal to be output exceeds the set value, the lateral shake correcting motor 7 is temporarily rotated in the reverse direction by the signal from the comparing means 13 and the signal from the state determining means 11. Then, the long film f is displaced in the width direction until the side edge s reaches the detection area of the detection sensor 2 to correct the lateral blur.

Although the above description has been made on the case where the transmission type detection sensor 2 is used, the same effect can be obtained by using a reflection type detection sensor.

Although the above embodiment is applied to a film feeder of a packaging machine, the present invention can also be applied to a printing machine or the like for conveying long plain paper.

[0019]

As described above, according to the present invention, when the detection / non-detection signal of the detection sensor for detecting the side edge of the long sheet exceeds the preset time, the long sheet is removed.
Displaced in the width direction from the detection position to the non-detection direction and from the non-detection position to the detection direction, so that the horizontal deviation of the long sheet can be easily and easily corrected with only one set of detection sensors. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus showing one embodiment of the present invention.

FIGS. 2 (a) to 2 (c) are views showing each operation of correcting a lateral shake of a long sheet by the above device.

FIG. 3 is a flowchart showing a lateral blur correction operation of the above device.

[Explanation of symbols]

 2 Detection sensor 7 Motor for correcting horizontal blur 10 Control device f Long sheet s Side edge

Claims (2)

[Claims] 1. A method for correcting a lateral deviation of a sheet applied to a long sheet feeding device, based on a sheet detection / non-detection signal of a detection sensor disposed in a region where a side edge of the long sheet passes. When the duration of the detection / non-detection signal exceeds a preset time, the long sheet is displaced in the width direction from the detection position in the non-detection direction and from the non-detection position in the detection direction. A lateral blur correction method for a sheet, characterized in that: 2. A sheet deviation correcting device applied to a long sheet feeding device, wherein a sheet detection sensor is disposed in a region where a side edge of the long sheet passes, and sheet detection by the detection sensor is performed. A control means for displacing the long sheet in the width direction from the detection position to the non-detection direction and from the non-detection position to the detection direction by a signal output when the duration of the signal exceeds the preset time. A lateral blur correction device for a seat, characterized in that it is provided.