JPH0753121A - Chopper phase control method and its device - Google Patents

Abstract

PURPOSE:To secure a folding quality by predetermining speed follow-up relation, which continuously shows the relation between printing speed and a chopper phase, computing the target value of the chopper phase corresponding to the present value of the printing speed using a speed follow-up function, and regulating and controlling the chopper phase so that it corresponds to the target value. CONSTITUTION:A storage means 32 of a control unit 30 in a chopper phase controller 10 stores chopper phases set by a setting means 31 in every predetermined printing speed. A computing means 33 determines a speed follow-up function, which continuously indicates the relation between the printing speed and a chopper phase, on the basis of respective data stored in the storage means 32 so as to compute a target value for the chopper phase corresponding to the current value of the printing speed detected by a printing speed detecting means 20. Then, a comparative control means 34 compares the current value of the chopper phase detected by a chopper phase detecting means 21 with the target value found by the computing means 33 so as to send a command signal to a driving regulating means 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chopper phase control method and apparatus for controlling a chopper phase of a chopper folding machine attached to a printing machine such as an offset rotary printing machine.
It can be used when the chopper phase is automatically adjusted and controlled according to the printing speed of the printing press.

[0002]

BACKGROUND ART Conventionally, a chopper folding machine of a rotary printing machine cuts a printed continuous paper into unit lengths, and
The signature is appropriately folded in the vertical and horizontal directions to form a signature, and then the chopper blade is moved up and down to perform chopper folding (vertical folding) of this signature. FIG. 4 shows an example of such a chopper folding machine. The chopper folding machine 80 includes a nipping roller 81, a saw cylinder 82, a folding cylinder 83, a biting cylinder 84, and a conveyor belt 8 from the upstream side (upper right in FIG. 4).
It is equipped with 5. A chopper device 90 that performs chopper folding is provided on the downstream side of the conveyor belt 85, and further on the downstream side, a folding roller 86 and an impeller 8 are provided.
7. A conveyor belt 88 for discharging paper is provided. Further, a stopper 89 is provided on the conveyor belt 85 at a position passing through the chopper device 90.

FIG. 5 shows a side view of the chopper device 90 as seen from the direction of arrow A in FIG. The chopper device 90 includes a chopper arm 92 having a chopper blade 91 at its tip, a rotating shaft 93, and a crank 94 connecting the rotating shaft 93 and the chopper arm 92. This chopper device 90 rotates the rotation shaft 93 to the crank 9
The chopper arm 92 is swung by transmitting it to the chopper arm 92 via 4 to move the chopper blade 91 up and down.

The operation of the chopper folding machine 80 will be described. First, the printed continuous paper 96 is fed downward by the nipping roller 81, and is sandwiched between the saw cylinder 82 and the folding cylinder 83. The folding cylinder 83 is cut into a unit length with a saw blade, and the cut end of the paper is hooked on the needle of the folding cylinder 83.
The paper is fed along the circumferential direction, and the substantially central portion of the cut paper is bitten by the biting claws of the biting body 84 and laterally folded to form a signature 97.
Next, the signature 97 is sent to the chopper device 90 by the conveyor belt 85. In the chopper device 90, the chopper blade 91 is lowered so as to be brought into contact with the fold position in the substantially central portion of the signature 97, and the signature 97 is pushed between the folding rollers 86,
The chopper of signature 97 is folded. After that, the chopper-folded signature 97 is sent to the impeller 87, and is discharged by the discharge conveyor belt 88.

By the way, at the time of chopper folding by the chopper device 90 described above, it is required that the chopper blade 91 is moved up and down at an appropriate timing with respect to the signature 97 sent by the conveyor belt 85. That is, normally, the timing of lowering the chopper blade 91 is when the left end of the signature 97 in FIG. 1 is in front of the stopper 89. If the timing at this time is not appropriate, the signature 97 collides with the stopper 89 and the signature 97 repels or is deformed, resulting in poor folding accuracy or product damage, or folding. The tab 97 is not pushed between the folding rollers 86, causing a problem such as a paper jam.

Further, the left end of FIG. 1 and the stopper 8 of the signature 97 at the timing of lowering the chopper blade 91.
The appropriate value of the distance to 9 slightly changes depending on the printing speed, the paper quality, the number of pages, and the like. Therefore, the phase of the vertical movement of the chopper blade 91, in other words, the phase of the rotating shaft 93 that causes the chopper arm 92 to swing via the crank 94 (chopper phase) is adjusted according to the change in the appropriate value of the distance, and thus the chopper is adjusted. The timing when the blade 91 starts to descend downward must be an appropriate timing. Such adjustment of the chopper phase is required even after the type of printing (paper quality, number of pages, etc.) has been decided and the printing operation is started. This is a case where the printing speed is gradually increased while watching the condition when the subsequent printing machine is restarted.

FIG. 6 shows a conventional example of a chopper folding machine provided with a chopper phase control device 100 for adjusting the chopper phase (see Japanese Utility Model Publication No. 4-23886). The chopper phase control device 100 includes a printing speed detection unit 110 that detects the current value of the printing speed and a chopper phase detection unit 120 that detects the current value of the chopper phase.
And a drive adjustment means 140 that receives a command from the control unit 130 and adjusts the drive of the chopper phase.

The drive adjusting means 140 receives a command from the control unit 130 to start and stop, a gear train mechanism 142 connected to the motor 141, and a male screw receiving rotation transmission from the gear train mechanism 142. Screw shaft 143 having a thread, a female screw 144 screwed with a male screw of the screw shaft 143, and a helical gear 14 to which the female screw 144 is fixed.
5 and a helical gear 146 fixed to the helical gear 145.
And helical gears 147 and 148 that mesh with the helical gears 145 and 146, respectively. The chopper phase detection means 120 is connected to the gear train mechanism 142.
The printing speed detecting means 110 is connected to the helical gear 148.

During normal printing operation, the drive adjusting means 140 receives a drive input from the helical gear 148 which is interlocked with the main body of the chopper folding machine, and this rotation causes the helical gear 14 to rotate.
6, transmission in the order of helical gear 145, helical gear 147,
It is configured to drive the chopper device 90. At this time, when it is necessary to adjust the chopper phase, the rotation of the motor 141 is rotated via the gear train mechanism 142.
3 and the rotation of the screw shaft 143 causes the screw shaft 14 to rotate.
The helical gears 145 and 146 screwed to the No. 3 arrow B in the figure.
By moving the helical gears 145, 146 and the helical gears 147, 148, respectively, to shift the phase between the helical gear 147 and the helical gear 148. It has become.

The control unit 130 includes a print speed setting unit 131 composed of a plurality of capacity variable adjusters 131 (1) to 131 (N) whose speeds are set in advance, and a plurality of capacity variable adjusters whose phases are set in advance. And a chopper phase setting device 132 including 132 (1) to 132 (N). Also,
The variable capacity adjusters 131 (1) to 131 (N) and the variable capacity adjusters 132 (1) to 132 (N) are interlocked with each other.

The operation of the control unit 130 will be described. The current value of the print speed is input from the print speed detecting means 110, and the variable capacity adjusters 132 (1) to 132 (1) to 1 of the print speed setting unit 131 are input.
A capacity variable adjuster corresponding to the current value is selected from 32 (N) to determine the print speed, and the chopper phase setting device 132 corresponding to the capacity variable adjuster of the selected print speed setting device 131 is selected. The target value of the chopper phase is obtained from the variable capacity regulator. Then, the current value of the chopper phase is input from the chopper phase detection means 120, this current value is compared with the obtained target value, and if they do not match, the motor 141
A command signal is sent to to change and adjust the chopper phase.
Such a change adjustment operation is continued until the current value matches the target value, and at the time when the current value matches the target value, a stop command signal is sent to the motor 141.

[0012]

However, in such a conventional chopper phase control device 100 as described above, the variable capacity adjusters 132 (1) to 132 (132) of the printing speed setting device 131 are used.
Since the chopper phase is set in steps corresponding to the printing speed set in (N), the chopper phase follow-up correction according to the printing speed becomes a stepwise correction, and the chopper phase of the printing speed may be changed depending on the value of the printing speed. There is a possibility that the error of the target value may become large, and there is a problem that the folding quality cannot be sufficiently secured. In addition, the chopper phase control device 100
However, in order to configure the printing speed setting device 131 and the chopper phase setting device 132, a large number of variable capacity adjusting devices are required, which causes a problem that the equipment becomes large. Further, in such a configuration, it is limited to make a preset printing speed interval fine and improve folding accuracy because the same number of capacity variable adjusters must be prepared.

An object of the present invention is to provide a chopper phase control method capable of smoothly tracking and correcting the chopper phase of a chopper folding machine according to changes in the printing speed of the printing machine, and ensuring sufficient folding quality. To provide the device.

[0014]

SUMMARY OF THE INVENTION According to the present invention, a speed following function that continuously indicates a relationship between a printing speed and a chopper phase is set in advance, and the chopper phase following correction is performed by the speed following function to achieve the above object. Is to achieve. Specifically, the chopper phase control method of the present invention uses a speed following function that continuously indicates the relationship between the printing speed of the printing machine and the chopper phase of the chopper folding machine based on the data of the chopper phase for each predetermined printing speed. It is characterized in that the target value of the chopper phase corresponding to the current value of the printing speed is calculated using this speed following function, and the chopper phase is adjusted and controlled so as to match the obtained target value. . Also,
The chopper phase control method of the present invention is characterized in that the velocity tracking function is a polygonal line approximation function obtained by linearly interpolating between the respective data.

Further, the chopper phase control device of the present invention comprises a printing speed detecting means for detecting the current value of the printing speed of the printing machine, a chopper phase detecting means for detecting the current value of the chopper phase of the chopper folder, and a chopper. Storage means for storing a phase for each predetermined printing speed, and a speed tracking function that continuously shows the relationship between the printing speed and the chopper phase based on the data stored in this storage means are set and detected by the printing speed detecting means. The calculation means for calculating the target value of the chopper phase corresponding to the current value of the printing speed, and the current value of the chopper phase detected by the chopper phase detection means and the target value are compared to determine the chopper phase as the target value. It is provided with a comparison control means for controlling so as to match and a drive adjustment means for drivingly adjusting the chopper phase in response to a command from the comparison control means. To.

[0016]

In the present invention as described above, the chopper phase is stored in the storage means for each predetermined printing speed, and the speed of continuously indicating the relationship between the printing speed and the chopper phase in the arithmetic means based on the stored data. A follow-up function is defined, the target value of the chopper phase corresponding to the current value of the print speed detected by the print speed detecting means is calculated by the calculating means according to the speed follow-up function, and the current value of the chopper phase detected by the chopper phase detecting means is calculated. The comparison control means compares the target value obtained by the calculation means with the comparison control means, and the comparison control means sends a command to the drive adjustment means to perform adjustment control so that the chopper phase matches the target value. At this time, the speed following function continuously determines the relationship between the printing speed and the chopper phase, and the target value of the chopper phase is obtained according to this continuous speed following function. Compared with the following correction, the smooth follow-up correction according to the change of the printing speed is performed, and the folding quality is sufficiently secured.

By setting the speed following function as a polygonal line approximation function by linear interpolation, complicated calculation is not required when determining the speed following function, and each data stored in the storage means is changed to change the speed following function. It becomes possible to easily and promptly perform the work of correcting the above, and it becomes possible to sufficiently realize the configuration even with a small personal computer or the like, thereby achieving the above object.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a chopper phase control device 10 according to this embodiment. The chopper phase control device 10 is
Since the chopper folding machine is similar to the chopper folding machine 80 having the chopper device 90 shown in FIG. 4 and FIG. 5 described above, the reference numerals of the respective parts of the chopper folding machine 80 are used as they are, and detailed description thereof will be omitted. Chopper phase control device 10
Is a print speed detecting means 20 for detecting the current value of the print speed.
A chopper phase detecting means 21 for detecting the current value of the chopper phase, a control unit 30 for controlling the chopper phase,
It is configured by a drive adjusting unit 40 that receives a command from the control unit 30 and adjusts the drive of the chopper phase.

The drive adjusting means 40 is the drive adjusting means 14 of the conventional chopper phase controller 100 shown in FIG.
Since the configuration is the same as that of 0, the same reference numerals are given to the components inside thereof and detailed description will be omitted. The printing speed detecting means 20 is composed of an encoder or the like. The chopper phase detection means 21 is composed of a potentiometer or the like. Further, the connection portion of the printing speed detecting means 20 and the chopper phase detecting means 21 is the same as the printing speed detecting means 110 and the chopper phase detecting means 120 of the conventional chopper phase control device 100 (see FIG. 6).

The control unit 30 sets a setting means 31 for setting the chopper phase for each predetermined printing speed, a storage means 32 for storing the chopper phase set by the setting means 31, and data stored in the storage means 32. Based on the speed-following function, which continuously indicates the relationship between the printing speed and the chopper phase, the calculating means 33 calculates the target value of the chopper phase corresponding to the current value of the printing speed detected by the printing speed detecting means 20.
And a comparison control means 34 which compares the current value of the chopper phase detected by the chopper phase detection means 21 with the target value obtained by the calculation means 33 and sends a command signal to the drive adjustment means 40. The control unit 30 includes various memories (RO
(M and RAM) and a CPU (central processing unit) built-in microcomputer, and an operation panel 50 and the like connected thereto. FIG. 2 shows an example of the operation panel 50, and the description of each operation part will be described later.

The operation of the chopper phase control device 10 includes a setting mode (teaching mode) for setting a speed following function which continuously indicates the relationship between the printing speed and the chopper phase, and
There is a normal operation mode in which the chopper phase is controlled according to the speed following function set in this setting mode during a normal printing operation. Further, the setting modes include a stop state teaching mode in which each data is taught while the printing machine is stopped, and an operation state teaching mode in which each data is taught while adjusting the operation of the printing machine.

The display of the chopper timing in the chopper phase control device 10 is performed as follows. The timing (chopper phase) at the moment when the signature 97 hits the stopper 89 when the printing press is operated at a slow speed is set as the display reference point K, and the display value at this time is set to 0 (see FIG. 5). The zero point of the chopper phase detecting means 21 is also adjusted at the display reference point K. And the display of the current value of the chopper timing is
The offset angle θ (deg) of the chopper timing from the display reference point K is converted into a unit of millimeter by the following equation. Current value of chopper timing (mm) = L × θ / 36
0 where the chopper timing offset angle θ (de
g) is the rotation angle of the crank 94 from the display reference point K, that is, the rotation angle of the rotation shaft 93 (see FIG. 5).
Further, L is the conveyance amount (mm) of the conveyor belt 88 for discharging paper per one rotation of the crank 94 (rotating shaft 93).

In this embodiment, each data is set in the setting mode of the chopper phase control device 10 as follows. First, the setting means 31 sets the offset amount from the display reference point K as the preset reference point P when the printing speed is 0 (rpm), and stores this value in the storage means 32. Next, the setting unit 31 sets the offset amount from the preset reference point P at each predetermined printing speed (each point) to preset data P1, P2, P.
3, -is stored in the storage means 32. At this time, the predetermined print speeds are, for example, 50, 100, 150, ─, 650, 700.
Set it at an appropriate interval such as 50 (rpm) such as (rpm).

FIG. 3 shows preset reference points P set in this way and preset data P at each printing speed.
The relationship with 1, P2, P3, ─ is shown. For the actual target data of the chopper phase, the display value at the display reference point K is 0
Is obtained by adding each preset data P1, P2, P3, ... To the value of the preset reference point P.

As a specific teaching example in the setting mode, the following operation is performed in the stop state teaching mode in which teaching is performed while the printing press is stopped. First, the printer is stopped and the setting mode selection button 51 on the operation panel 50 is pressed to select the setting mode (see FIG. 2). At this time, the setting mode selection button 51 is in a lit state (not blinking) to inform the operator that the stopped state teaching mode is set.
Next, when the point button 52 is pressed, the print speed display section 5
In 3 is displayed each predetermined printing speed (each point) which is input and set in advance. For example, in the case of setting the interval of 50 (rpm), the display (point display) indicating 0, 50, 100, 150, ─, 650, 700 (rpm) is displayed in order.

The chopper timing (m) corresponding to each printing speed sequentially displayed on the printing speed display section 53
m) is set in order by pressing the advance button 54 or the delay button 55. At this time, the chopper phase display unit 56
Indicates the value of the chopper timing currently set, and the operator presses the advance button 54 or the delay button 55 while looking at this display to increase or decrease this display value to set a desired value. When the print speed display section 53 shows 0 (rpm), the chopper phase display section 56 shows the value of the preset reference point P, and the print speed display section 53 displays 50, 100. , 150,
─, 650, 700 (rpm), the chopper phase display section 56 shows the values of preset data P1, P2, P3 ,. By repeating the above operation, the preset reference point P and each preset data
The values of P1, P2, P3, ─ can be confirmed and changed as appropriate.

Further, in the operation state teaching mode in which teaching is performed while the printing machine is operating, the following operation is performed. First, the setting mode selection button 51 on the operation panel 50
Press to select the setting mode (see Fig. 2). At this time,
The setting mode selection button 51 is in a lighted state and then blinks when the printing machine enters the operating state to inform the operator that the operating state teaching mode is set.
In this operating state teaching mode, the print speed display unit 53 and the chopper phase display unit 56 display the print speed detecting means 20 and the chopper phase detecting means 21, respectively.
The display switches to the display of the current value detected by. Next, when the printing machine is operated at a slow speed (substitute for 0 rpm), the chopper timing follows the speed based on the preset reference point P (which may not be set at the initial stage). If this timing is not appropriate, adjust to the appropriate timing.
Then, at this timing, the current value of the chopper phase is input by the chopper phase detecting means 21, and the value at this time is set as the preset reference point P.

After that, when the printing speed is increased to 50 (rpm), the chopper timing is set to the speed based on the preset reference point P and preset data P1 (which may not be set at the first stage). Since it follows, if this timing is not appropriate, adjust to the appropriate timing. Then, at this timing, the chopper phase detecting means 21 inputs the current value of the chopper phase, and the difference between the detected value at this time and the value of the preset reference point P is automatically set as the preset data P1. In addition, printing machines 100, 150, ─, 650, 700 (rpm)
And 50 (rpm) intervals are sequentially increased, and at each of these printing speeds, the chopper timing is adjusted to an appropriate timing and preset data P2, P3, -values are set. The preset reference point P and the values of the preset data P1, P2, P3, --set in this way are checked and changed when the printing machine is stopped and the above-mentioned stopped state teaching mode is checked and changed. It can be performed by the same operation as the operation of.

In this embodiment, after setting each data used for the chopper phase control in the setting mode as described above, the normal printing operation is performed while the chopper phase control is performed as follows. Prior to performing the normal printing operation, the operator presses the normal operation mode selection button 57 on the operation panel 50 to select the normal operation mode (see FIG. 2). At this time, the normal operation mode selection button 57
Lights up and informs the operator that the normal printing operation is in progress. In this normal operation mode, the display of the print speed display unit 53 and the chopper phase display unit 56 is the display of the current value detected by the print speed detection unit 20 and the chopper phase detection unit 21, respectively.

In the normal operation mode, as shown in FIG.
First, each data (preset reference point P and each preset data P1, P2, P3, ...) Stored in the storage means 32 is input to the arithmetic means 33, and a predetermined printing speed (each point) is based on each of these data. The linear data is interpolated between the target data of the chopper phase (dashed-dotted line shown in steps in FIG. 3) by the calculation means 33, and the speed following function F (solid line in FIG. 3) is determined as a polygonal line approximation function. The speed following function F determined in this way is a continuous function with respect to the printing speed (horizontal axis in FIG. 3). Then, the printing machine is operated, the current value of the printing speed detected by the printing speed detecting means 20 is input to the calculating means 33, and the calculating means 33
The target value of the chopper phase corresponding to the input current value is obtained according to the speed following function F, and the obtained target value is sent to the comparison control means 34.

Next, the comparison control means 34 inputs the current value of the chopper phase detected by the chopper phase detecting means 21 and compares the target value of the chopper phase sent from the calculating means 33 with this current value. At this time, when the current value is different from the target value, a command signal is sent to the drive adjusting means 40 to adjust the chopper phase, and when the current value matches the target value, the drive adjusting means 40 is choppered. A command signal for stopping the phase adjustment is sent, and such comparison control is repeated until the current value and the target value match.

Further, when the advance button 54 or the delay button 55 is pressed in the normal operation mode, the speed following function F as a whole moves up and down (change amount S) as shown by the chain double-dashed line in FIG. The adjustment target value of is changed. At this time, the values of the preset data P1, P2, P3, ... Are not changed and only the value of the preset reference point P is increased or decreased.

According to this embodiment, the following effects can be obtained. That is, a continuous speed follow-up function F is determined based on each data stored in the storage means 32, and the target value of the chopper phase is calculated by the calculating means 33 according to this speed follow-up function F. Since the chopper phase control can be performed more smoothly than in the case of tracking correction, sufficient folding quality can be ensured.
Further, since the speed following function F is a polygonal line approximation function by linear interpolation, complicated calculation is not required when determining the speed following function F, and each data stored in the storage means 32 is changed to change the speed. The work of modifying the tracking function F can be performed easily and quickly, and the configuration can be sufficiently realized even with a small personal computer or the like.

Further, the drive adjusting means 40 includes the motor 14
Since the chopper phase can be automatically adjusted by driving 1 and there is no manual work such as manually turning the handle as this chopper phase adjustment work, the adjustment work can be performed accurately and quickly.

Since the target value of the chopper phase is obtained by adding the values of each preset data P1, P2, P3, to the value of the preset reference point P, only the value of the preset reference point P is increased or decreased. By doing so, the speed following function F can be raised or lowered as a whole, and the target value of the chopper phase can be easily changed during the normal printing operation.

The present invention is not limited to the above-described embodiments, but includes other configurations that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention. That is, in the above embodiment, the speed following function F is a polygonal line approximation function by linear interpolation,
The function is not limited to such a function. For example, a higher-order curve whose coefficient is determined by the method of least squares or the like may be used. In short, it is a continuous function with respect to the printing speed, and the chopper phase is used as the change in the printing speed. It suffices if it can smoothly follow.

Further, in the above-described embodiment, each data is stored in the storage means 32 in the setting mode, and these data are read by the calculating means 33 in the normal operation mode to determine the speed following function F. When the speed following function F is not a function that can be easily determined like the polygonal line approximation function by the linear interpolation of the above-mentioned embodiment, for example, the speed following function F is a high-order curve whose coefficient is determined by the least square method or the like. In some cases, the arithmetic means 33 reads each data from the storage means 32 at the stage of executing the setting mode, and previously performs a complicated arithmetic operation for determining the coefficient of the speed following function F based on each read data. Good.

Further, in the above embodiment, the drive adjusting means 4
0 has the same structure as the drive adjusting means 140 of the conventional example shown in FIG. 6, but is not limited to such a structure, and in short, the chopper phase is set in accordance with the command signal from the comparison calculating means 34. Any configuration that can be automatically adjusted may be used. The connection locations of the printing speed detecting means 20 and the chopper phase detecting means 21 are arbitrary, and in short, it is sufficient that they are connected to a portion that moves corresponding to the current value of the printing speed and the current value of the chopper phase.

Further, in the above-mentioned embodiment, the printing speed at each point in the setting mode is set to 50, 100, 150, ─, 650,
Although it was set to 700 (rpm), it is not limited to such setting of the printing speed, for example, 70, 120, 17
It may be set to 0, ─, 670, 705 (rpm), that is, a printing speed at which an appropriate speed following function F can be determined may be set as a basic point for linear interpolation or the like. Further, the interval of each printing speed is preferably about 50 (rpm) as in the above-mentioned embodiment, but is not limited to this interval and is arbitrary. Then, the intervals may be changed between the respective printing speeds. For example, the interval of the portion of the speed following function F having a small gradient may be widened to reduce the number of points, and the interval of the portion having a large gradient may be narrowed. You may increase the number of points.

[0040]

As described above, according to the present invention, a velocity tracking function that continuously indicates the relationship between the printing speed of the printing press and the chopper phase of the chopper folding machine is determined, and the chopper phase is determined according to this velocity tracking function. Since the target value of is calculated, the chopper phase can be smoothly tracked and corrected according to the change in the printing speed, and the folding quality can be sufficiently ensured.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of an operation panel of the embodiment.

FIG. 3 is an explanatory diagram of a velocity tracking function of the above embodiment.

FIG. 4 is a configuration diagram of a chopper folding machine.

FIG. 5 is a side view of a chopper device of the chopper folding machine.

FIG. 6 is a configuration diagram showing a conventional chopper phase control device.

[Explanation of symbols]

 10 Chopper phase control device 20 Printing speed detection means 21 Chopper phase detection means 30 Control section 31 Setting means 32 Storage means 33 Computing means 34 Comparison control means 40 Drive adjusting means 50 Operation panel 80 Chopper folding machine 90 Chopper device F Speed following function P Preset reference point K display reference point

Claims (3)

[Claims] 1. A speed following function that continuously indicates a relationship between a printing speed of a printing machine and a chopper phase of a chopper folding machine is previously determined based on data of a chopper phase for each predetermined printing speed, and this speed following function is set. Is used to calculate a target value of the chopper phase corresponding to the current value of the printing speed, and the chopper phase is adjusted and controlled so as to match the obtained target value. 2. The chopper phase control method according to claim 1, wherein the speed tracking function is a polygonal line approximation function obtained by linearly interpolating between the respective data. 3. A printing speed detecting means for detecting a current value of a printing speed of a printing machine, a chopper phase detecting means for detecting a current value of a chopper phase of a chopper folding machine, and a chopper phase stored for each predetermined printing speed. And a speed follow-up function that continuously indicates the relationship between the printing speed and the chopper phase based on the data stored in the storing means and corresponds to the current value of the printing speed detected by the printing speed detecting means. Computation control means for computing the target value of the chopper phase and comparison control means for comparing the current value of the chopper phase detected by the chopper phase detection means with the target value so that the chopper phase matches the target value. And a drive adjustment means for driving and adjusting the chopper phase in response to a command from the comparison control means.