JPH0839486A - Paper cutting control method - Google Patents

Abstract

PURPOSE:To provide a paper cutting control method without generating displacement of a cutting position, even when provided a skew feed of printing paper and its position displacement in a width direction, by relaxing a standard of the paper in use. CONSTITUTION:CCD25, CCD40 for detecting width dimension of paper and its feed position, CCD26 for detecting a paper cutting position and a servo motor 10 for moving circular slitters 3, 4 in a paper width direction are provided, and by a difference between a value correcting a paper width dimensional error in an output value of the CCD25 and an output value of the CCD26, the servo motor 10 is rotated to move the circular slitters 3, 4 to a proper cutting position before cutting and during cutting paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutting control method, and more particularly to a paper cutting control method for a paper cutting device that divides a cut paper into two or three parts.

[0002]

2. Description of the Related Art A conventional paper cutting control method will be described. FIG. 7 is a schematic explanatory view including a partial cross section of a paper cutting device used in a conventional paper cutting control method. In FIG. 7, 1 and 2 are slitter mounting shafts, 3 is a circular slitter upper blade, 4 is a circular slitter lower blade, 5, 6 and 8 are collars,
7 is a ball bearing, 9 is a ball screw, 10 is a servo motor, 11 is a coupling, 12 is a moving plate, 1
3 is paper, 14 is a motor drive circuit, 15 is a spring,
Reference numeral 16 is a stop collar, 17 and 18 are meshing gears, and 19 is a drive gear.

As shown in FIG. 7, in the paper cutting control device, shafts 1 and 2 are provided above and below the paper 13 in the paper conveying direction, that is, in the direction orthogonal to the direction from the front surface to the back surface of the paper in the figure. Spline grooves are provided on the outer surfaces of the shafts 1 and 2, respectively.

Circular slitter upper blade 3 and circular slitter lower blade 4
Are integrally fixed to the collars 5 and 6, respectively, and the inner diameter portions of the collars 5 and 6 are provided with spline grooves that mesh with the spline grooves of the shafts 1 and 2, respectively. Therefore, the circular slitter upper blade 3 and the circular slitter lower blade 4 engage with the shafts 1 and 2 via the collars 5 and 6, respectively.

At the ends of the shafts 1 and 2, meshing gears 17 and 18 are provided in series, and a drive gear 19 is provided.
And is rotated by a motor (not shown).
Collar 5 integrated with the circular slitter upper blade 3
Is provided with a fixed collar 8 rotatably mounted via a ball bearing 7.

When the drive gear 19 is rotated by a drive source (not shown), the ball bearing 7 causes the shafts 1 and 2 to rotate while the fixed collar 8 is stopped, and the circular slitter upper blade is rotated. 3. The circular slitter lower blade 4 rotates to cut the paper between the two blades.

The fixed collar 8 and a nut 9-2 of a ball screw 9 provided in parallel with the shaft 1 are fixedly connected via a moving plate 12. The end of the shaft 9-1 of the ball screw 9 is connected to the servomotor 10 by a coupling 11. The servomotor 10 is driven by a motor drive circuit 14.

The circular slitter lower blade 4 has one end fixed by a stop collar 16 and the other end fixed to the collar 6 by a spring 15 in the axial direction of the shaft 2.
It is pushed from right to left in the figure. Further, the tip of the circular slitter upper blade 3 and the tip of the circular slitter lower blade 4 slightly overlap each other in the direction perpendicular to the shaft axis.

Therefore, by moving the circular slitter upper blade 3 in the axial direction of the shaft 1 by the servo motor 10 via the coupling 11, the ball screw 9, the moving plate 12, and the fixed collar 8, the circular slitter lower blade 3 is moved. The blade 4 can be moved.

The servo motor 10 adjusts the paper cutting position.
Can be performed by moving the upper and lower circular slitters 3 and 4 to predetermined positions via the ball screw shaft 9 by rotating the motor normally or reversely by the motor drive circuit 14. For example, assuming that the lead of the ball screw shaft 9 is 5 mm / revolution and the rotary encoder of the servomotor 10 is 600 pulses / revolution, the movement amount per pulse is 1/120 mm.
/ It becomes a pulse. With such a configuration, the sheet cutting position can be adjusted with high accuracy.

When cutting continuous paper, there is a paper feed hole at both ends of the paper, so the paper will not skew, but in the case of cut paper, the skew of the paper and the amount of positional deviation in the paper width direction. It is difficult to eliminate all. Normally, when the sheet skew correction mechanism is not provided, the sheet skew amount is ± 3 to ± 4.
mm. Even if a special sheet skew correcting mechanism is provided, the sheet skew and the amount of positional deviation are about ± 0.5 mm. When two-up printing paper that prints two sheets of print data on one cut sheet at the same time is divided into two at the center, the cut sheets may be used by overlapping.
If there is a deviation of 0.5 mm, the two sheets will not overlap properly.

[0012]

A conventional paper cutting control method using a paper cutting device is as described in detail above.
When the paper is skewed, the paper is cut smoothly, and the cut paper is displaced from the original cutting position. In particular, when the paper after 2-up printing is divided into two, the printed recording portion is cut, which is a fatal problem.

Further, the fatal problem has occurred regardless of whether or not the printing paper width has a constant size if the printing paper is skewed or misaligned in the paper width direction. If there are variations in the finished dimensions, the problem was exacerbated. Generally, the finished size of paper is JIS
There is a variation of about ± 2 mm depending on the finished size of paper processing. Therefore, conventionally, a printing paper of a special standard in which the finishing dimension tolerance of the paper width is limited to, for example, within ± 0.5 mm is used, which causes a problem of high cost and inconvenience.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and relaxes the standard restriction of the paper used to the JIS standard, and further, the printing paper is skewed or the paper width direction is increased. It is an object of the present invention to provide a sheet cutting control method that does not cause the cutting position to shift even if there is a positional shift.

[0015]

In order to achieve the above object, in a paper cutting control method according to the present invention, a pair of circular slitters composed of an upper blade and a lower blade are moved in the paper width direction to remove the paper. In the paper cutting control method of cutting at a predetermined position in the width direction, the paper position in the width direction is detected by the first sensor, the paper width is detected by the first sensor and the second sensor, and the third sensor is used. The position of the circular slitter is detected by a sensor, the sheet position is corrected by the control unit by the sheet width, and before the sheet is cut according to the positional deviation amount of the circular slitter position corresponding to the corrected sheet position. Also, the position of the circular slitter is moved in the paper width direction during paper cutting. In the paper cutting control method described in the preceding paragraph, the first sensor is arranged at one end in the width direction of the paper, and the second sensor is provided with a predetermined paper width in the width direction of the paper from the first sensor. It is characterized in that they are arranged separately. In any of the paper cutting control methods described in the preceding paragraphs, a charge coupled device is used for the first sensor, the second sensor and the third sensor.

A more detailed description will be given. (1) The position of the sheet is detected by the first sensor arranged at a predetermined position before the cutting position in the sheet feeding direction. The paper width dimension is measured by the first sensor and the second sensor. (2) The first sensor and the second sensor are provided at both ends in the width direction of the used paper, and the mounting distance between them is defined as the specified paper width dimension of the used paper. (3) The position of the circular slitter is measured by the third sensor. (4) Charge coupled devices (hereinafter referred to as CCD) are used for the first sensor, the second sensor and the third sensor. (5) The position of the circular slitter is moved by the motor in the paper width direction. (6) The control unit causes the paper width dimension error amount to be calculated from the output values of the first CCD sensor and the second CCD sensor. (7) The output value of the first CCD sensor, the paper width dimension error amount, and the more accurate paper position D are detected, and the third CCD
Difference from the output value Y of the sensor | D−Y | More accurate position deviation amount of the circular slitter from the cutting position is obtained, the movement amount of the motor is obtained according to the position deviation amount, and the motor is driven.

[0017]

The function of each of the above technical means is as follows. (1) According to the configuration of the present invention, when the paper reaches the first CCD sensor, the first CCD sensor detects the position of the paper at a predetermined position, and the first CCD sensor and the second CCD sensor detect the position of the paper. CC
The paper width is detected by the D sensor and corrected to the paper position D detected by the first CCD sensor, the circular slitter position Y is detected by the third CCD sensor, and the above | D−Y |
According to the above, the position of the circular slitter can be moved for each sheet. If the predetermined position of the first CCD sensor is set to a fixed position before the cutting position in the paper feeding direction, the position is moved before cutting and the circular slitter is arranged at the correct cutting position to cut the paper. can do. (2) According to the configuration of the present invention, the sheet deviation, the skew amount of the sheet, the sheet width, and the position of the circular slitter are detected, and the above | D-Y | Accordingly, the paper can be cut while moving the position of the circular slitter.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a paper cutting control method according to the present invention will be described with reference to FIGS. 1 is a schematic explanatory view of a paper cutting control method according to an embodiment of the present invention, FIG. 2 is a time chart diagram of CCD output in the embodiment of FIG. 1, and FIG. 3 is a paper cutting control method of the embodiment of FIG. 4 is a block diagram of a control circuit used in FIG. 4, FIG. 4 is a time chart of the paper cutting control method of the embodiment of FIG. 1, and FIG. 5 is a slitter movement before paper cutting in the embodiment of FIG. 1 (hereinafter referred to as initial position movement). FIG. 6 is a control flow chart, and FIG. 6 is a flow chart for controlling the slitter movement during sheet cutting in the embodiment of FIG.

In FIG. 1, the same symbols as those in FIG. 7 are the same parts, and the paper cutting device used in the paper cutting control method shown in FIG. 1 has many common parts with the paper cutting device shown in FIG. Since the description of these equivalent parts and common parts is complicated, detailed description thereof will be omitted, and the description thereof will be omitted, and description of the common parts will be omitted.

The main components of the new code will be described below. 25 is a CCD for detecting the skew position of the paper and the position in the paper width direction, and 26 is a CC for detecting the paper cutting position.
D, 27, 28 and 41 are light emitting diodes (hereinafter, LED
30 and 31 are optical sensors, 32 is an encoder, 3
Reference numeral 3 is a drive circuit, 34 is a control circuit, and 40 is a CCD for detecting the paper width.

The CCD 25 is one line pixel,
It is provided to detect the skew position of the sheet and the position in the sheet width direction. The detection width of the CCD 25 is about 14.3
mm, 1 detection pitch is 14 μm, and the total is 1
It is composed of 024 pitches. The output value of the CCD 25 will be described with reference to the time chart shown in FIG. For example, when the count CLK is 312.5 KHz, it becomes 3.2 μs per pulse pitch. The C
In order to secure the charge accumulation time of CD25, the sampling CLK is sent every 10 ms.

CCD 25 not shielded by paper 13
Is illuminated by the LED 27, and a POS P-P1 signal (described later) is output. For example, when half of the CCD 25 is blocked by paper, 1024 pitch / 2 ×
The signal is output for 3.2 μs = 1638.4 μs. By counting the output width of the POS P-P1 signal, the amount blocked by the sheet, that is, the sheet feeding position can be detected.

In the optical sensor 30, the paper 13 is the CCD 2
It is provided to detect that the number 5 has been reached. If the CCD 25 is not blocked by the paper 13, PO
The output width of the SP-P1 signal is 3276.8 μs. Due to the decrease in the output width, the paper 13
Can also be detected. Optical sensor 31
Is provided to detect that the paper 13 reaches the paper cutting unit.

The CCD 26 is provided to detect the paper cutting position and has the same specifications as the CCD 25.
I am using D. A sense plate 29 is attached to the moving plate 12 attached to the ball screw 9. The position of the circular slitters 3 and 4 can be detected by moving the sense plate 29 along with the movement of the circular slitters 3 and 4 and shielding the CCD 26 from the irradiation light of the LED 28. First, at the correct sheet cutting position, the CCD 25 and the CCD 26 are arranged so that the output of the CCD 25 and the output of the CCD 26 become equal.
The mounting position of is adjusted.

The CCD 40 is provided to measure the width of the sheet, and uses a CCD having the same specifications as the CCD 25. CC of the part not blocked by the paper 13
D40 is illuminated by the LED 41 and a signal is output. By counting the output width of the signal, the amount blocked by the paper, that is, the dimensional error of the paper width can be detected.

Next, the paper cutting operation will be described. For example, a case will be described in which the A3 paper is laterally fed at a paper feed speed of 30 inches / second (hereinafter, ips) and 100 pages / minute (hereinafter, PPM) and cut into two A4 papers. As shown above, A3 paper has 100 PPM, so the interval for picking up each page is 60 × 1000.
/ 100, that is, 600 ms.

The interval between the trailing edge of the A3 sheet picked up and delivered every 600 ms and the leading edge of the A3 sheet following thereafter is expressed in time (ms). A3
Time (ms) required to move 297 mm wide paper
Is [297 ÷ (30 × 25.4)] × 1000, which is 389.7 ms. The required time (ms) is 60
0-389.7≈214 ms. The sheet movement amount at 30 ips is 30 ips × 214 ms = 163 mm.

For this reason, it is necessary to move the sheet cutting position for each sheet to the initial position within 214 ms and within a sheet distance of 163 mm. The CCD 25 is mounted at a position 150 mm before the paper cutting section, and when the paper reaches the CCD 25, the servo motor 10 is rotated to control the initial position movement of the circular slitter. The movement of the initial position is completed before the sheet 13 reaches the sheet cutting section.
If the amount of movement is too large to complete the initial position movement operation, an abnormality is detected and the apparatus is stopped.

When the sheet 13 reaches the optical sensor 31, the circular slitter position movement control during sheet cutting is started. The optical sensor 31 is mounted 20 mm in front of the paper cutting section. Although not shown, the sheet 13 is fed by a plurality of transport rollers and is configured so as not to skew in the sheet cutting section.

Next, the paper cutting control circuit 34 will be described with reference to FIGS. The paper position signal in the paper feed direction is input to the microcomputer 35 through the shift register 36 and the AND gate 37. When the paper 13 reaches the optical sensor 30, the output of the optical sensor 30 is
It is synchronized by K and input to the shift register 36.

A1 output and B0 of the shift register 36
The output is input to the AND gate 37, and P1 TOP-
The P1 signal becomes "1". While the sheet 13 is sending the optical sensor 30, the P1 SNS-P1 signal is "1". Similarly, the P2 SNS-P1 signal is "1" while the paper 13 is sending the optical sensor 31. Each of the signals is input to the microcomputer 35. The microcomputer 35
Outputs a sheet cutting control signal in response to signal input from each CCD and each optical sensor, and controls the servomotor 10 through the motor drive circuit 14.

Next, the main signals displayed in FIG. 3 will be described. The F / R SEL-P1 signal instructs normal rotation and reverse rotation of the servo motor 10. The output becomes "1" during normal rotation. That is, the signal POS PP from the CCD 25
When 1 is larger than the signal POS C-P1 from the CCD 26, the servo motor 10 is rotated in the normal direction, and the F / R
The SEL-P1 signal becomes "1". The POS P-
When the P1 signal is smaller than the POSC-P1 signal, the servo motor 10 is rotated in the reverse direction, and the F / RSEL-P1
The signal becomes "0".

The DRV-P1 signal is the output A of the CCD 25.
And the output Y of the CCD 26 | A−Y |, a positional deviation amount Z from the correct cutting position corresponding to the sheet position is calculated. Since one CCD pitch counts 14 μm in 3.2 μs, the positional deviation amount Z is expressed by the following equation (1).

[0034]

[Equation 1]

The encoder 32 of the servo motor 10 is set to 600 pulses / rotation, and the lead of the ball screw 9 is set to 5 mm /
In the case of rotation, the movement is 5 mm in 600 pulses, and the motor movement amount is M = 120 × Z pulses. When the reference clock of the servo motor 10 is 3.124 KHz, the DRV-P1 signal becomes "1" for M / 3.124 ms.

The DRV ENB-P1 signal is used in the motor drive circuit 14 to control the speed and position of the servomotor 10 by inputting the reference CLK and the encoder CLK. When the DRV-P1 signal is input, acceleration / constant speed / deceleration / settling control of the servo motor 10 is performed, and the DRV ENB- is set until the servo motor 10 settles after acceleration.
The P1 signal is set to "0". The next motor start is prohibited until DRV ENB-P1 becomes "1".

The initial position movement control will be described with reference to the flowchart shown in FIG. In step S ₁ , when the leading edge of the paper 13 reaches the CCD 25 and the CCD 40, the P1 TOP-P1 signal becomes "1". In step S ₂ , the outputs A ₀ , CC of the CCD 25
The data of the output B _{0 of} D40 and the output Y ₀ of the CCD 26 are fetched by the microcomputer 35.

In step S ₃ , the paper width dimension of the printing paper is measured from the output A _{0 of the} CCD 25 and the output B _{0 of the} CCD 40 to obtain the paper width dimension error amount. As described above, the detection width of the CCD 25 and the CCD 40 is about 14.3 mm, and one pitch is 14 μm and 1024 pitches. Set the count CLK of the CCD to 3
When it is set to 12.5 KHz, it becomes 3.2 μs per pitch, and a signal for 3276.8 μs is output at all pitches and 1024 pitches. A signal is output from the CCD 25 and the CCD 40 from a portion not shielded by the paper 13.

The sheet 13 has an A3 standard sheet width of 420
In case of mm, the output A _{0 of the} CCD 25 and the CC
The sum of the output B _{0 of} D40 and the detection width of the CCD 25 and CCD 40 is 14.3 mm, and the output time is 3276.8.
μs. For example, if the paper width is 418 mm, A3
When the length is shorter than the specified value by 2 mm, the output A of the CCD 25
The sum of the output B ₀ of ₀ and the CCD40 is 14.3 + 2 =
The output time is 16.3 mm and the output time is 3725.7 μs.

On the other hand, when the paper width is 422 mm and 2 mm long, the sum of the output A _{0 of} the CCD 25 and the output B ₀ of the CCD 40 is 14.3-2 = 12.3 mm, and the output time is 2811.4 μs. Becomes Since the paper is divided in two,
The paper width dimension error amount C ₀ (μs) is expressed by the following equation (2).

[0041]

[Equation 2]

In step S ₄ , the paper position data A ₀
By correcting the paper width dimension error amount C ₀ , the variation in the paper width dimension is corrected. Correction value D ₀ = A ₀ −C _{0 In} step S ₅ , the correction value D ₀ is compared with the output value Y ₀ of the CCD 26, the normal rotation / reverse rotation of the servo motor 10 is switched, and the paper cutting position control is performed. When D ₀ -Y _{0> 0,} is rotated forward servo motor 10 and the F / R SEL-P1 signal "1". When D ₀ −Y ₀ = 0, F / R SE
The L-P1 signal remains in the previous state. D ₀ −Y ₀ <0
At this time, the F / R SEL-P1 signal is set to "0" and the servo motor 10 is rotated in the reverse direction.

In step S ₆ , the correction value D ₀ and the CCD
A positional deviation amount Z ₀ (mm) from the correct slitter position corresponding to the sheet position is calculated from the difference between the output values Y ₀ of 26 and the output value Y ₀ . The positional shift amount Z ₀ is represented by the following equation (3).

[0044]

(Equation 3)

In step S ₇ , the positional shift amount Z ₀
Is the motor movement amount M. Convert to. M. = 120 × Z ₀ pulse In step S ₈ , the servo motor 1 is output by outputting M ₀ pulses as the motor drive signal DRV-P1.
By rotating 0, the initial position of the circular slitter is moved.

Next, the position movement control during paper cutting will be described with reference to the flowchart of FIG. Step S ₁₁
, While the sheet 13 is passing through the CCD 25, P
1 The SNS-P1 signal becomes "1". In step S ₁₂ , while the signal is “1”, the paper feed position data A _i is taken into the microcomputer 35 from the CCD 25. The acquisition is performed in synchronization with the sampling CLK of 10 ms, and the data of the following formula (4) is sequentially stored in the microcomputer 35.

[0047]

[Equation 4]

In step S ₁₃ , a correction value ΣD _i is calculated in order to correct the error of the paper size. The correction value ΣD _i
Is expressed by the following equation (5).

[0049]

(Equation 5)

In step S ₁₄ , the P2 SNS-P1 signal is "1" while the paper 13 reaches the optical sensor 31 and passes through the optical sensor 31, that is, in the case of YES. In step S _15, during which is taken the paper cutting position data Yi to the microcomputer 35 from the CCD 26.

[0051] In step S _16, the data Yi of the corrected paper position data Di and CCD26 have accumulated in the microcomputer 35 compares sequentially switches the forward / reverse rotation of the servo motor 10. When Di-Yi> 0, F / R SEL-P
The signal 1 is set to "1" and the servomotor 10 is rotated in the normal direction. D
When i-Yi = 0, the F / R SEL-P1 signal remains in the previous state. When Di-Yi <0, F / R SE
The servo motor 10 is reversely rotated by setting the L-P1 signal to "0".

[0052] In step S _17, the | Di-Yi
From |, the positional shift amount Zi (mm) from the correct slitter position corresponding to the sheet position can be obtained. The Zi is represented by the following formula (6).

[0053]

(Equation 6)

In step S ₁₈ , the positional shift amount Z
The motor movement amount Mi is obtained from i. Mi = 120 × Zi pulses. In step S ₁₉ , it is confirmed by the DRV ENB-P1 signal whether or not the servo motor 10 is driven.

In step S ₂₀ , the DRV EN
When the B-P1 signal is "1", the motor drive signal DR
V-P1 is output for Mi pulses, and the circular slitter position is moved while the paper is being cut. When the DRV ENB-P1 signal is "0", the servo motor 10 is not driven.

[0056] In step S _21, in synchronization with the control sampling CLK, to 10 ms, is repeatedly performed during paper cutting. If paper cutting is completed, the flow returns to step S _13. In step S ₁₄ , if the paper 13 has finished passing through the optical sensor 31, that is, if NO, step S _14
14 ', the P2 SNS-P1 signal becomes "0",
The correction sheet position data Di is reset, and the control moves to the initial position movement control for the next sheet.

In this embodiment, the case of A3 paper has been described. However, when the paper size is changed, CC
By changing the position of D40, any paper size can be supported. By performing the above-described paper cutting control method, the paper can be cut with high accuracy of ± 0.5 mm or less.

[0058]

As described above in detail, according to the configuration of the present invention, by adding a simple member to the paper cutting device, the standard restriction of the paper used can be relaxed to the JIS standard.
Further, it is possible to provide a paper cutting control method that does not cause the cutting position to shift even if the printing paper skews or is displaced in the paper width direction.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a paper cutting control method according to an embodiment of the present invention.

FIG. 2 is a time chart of CCD output in the embodiment of FIG.

FIG. 3 is a block diagram of a control circuit used in the paper cutting control method of the embodiment of FIG.

FIG. 4 is a time chart of the paper cutting control method of the embodiment of FIG.

5 is a flow chart of the slitter initial position movement control in the embodiment of FIG.

FIG. 6 is a flow chart of a slitter movement control during sheet cutting in the embodiment of FIG.

FIG. 7 is a schematic explanatory view including a partial cross section of a paper cutting device used in a conventional paper cutting control method.

[Explanation of symbols]

 1, 2 ... Slitter mounting shaft 3 ... Circular slitter upper blade 4 ... Circular slitter lower blade 5, 6, 8 ... Color 7 ... Ball bearing 9 ... Ball screw 10 ... Servo motor 11 ... Coupling 12 ... Moving plate 13 ... Paper 14 ... motor drive circuit 15 ... spring 16 ... stop collar 17, 18 ... meshing gear 19 ... drive gear 25 ... CCD 26 for detecting paper position CCD ... 27, 28, 41 ... LED 30, 31 ... light for detecting paper cutting position Sensor 32 ... Encoder 34 ... Control circuit 35 ... Microcomputer 36 ... Shift register 37 ... AND gate 40 ... CCD for detecting paper width

Front Page Continuation (72) Inventor Kazutoshi Ohara 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Inventor Katsumi Kawamoto 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd.

Claims (3)

[Claims] 1. A paper cutting control method for moving a pair of circular slitters comprising an upper blade and a lower blade in the paper width direction to cut the paper at a predetermined position in the width direction. The position of the sheet in the direction, the width of the sheet is detected by the first sensor and the second sensor, the position of the circular slitter is detected by the third sensor, and the sheet position is set by the control unit. The width of the circular slitter is corrected in accordance with the width, and the position of the circular slitter is moved in the paper width direction before and during cutting of the paper according to the amount of misalignment of the circular slitter position corresponding to the corrected paper position. Paper cutting control method. 2. The paper cutting control method according to claim 1, wherein the first sensor is provided at one end in the width direction of the paper,
A sheet cutting control method, characterized in that the second sensor is arranged with a predetermined sheet width in the width direction of the sheet from the first sensor. 3. The sheet cutting control method according to claim 1, wherein a charge coupled device is used for the first sensor, the second sensor and the third sensor. Control method.