JP2000318245A - Method and apparatus for controlling sheet cut length for web type electronic printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling a sheet cut length when printing is started and when printing is finished to an appropriate length. SOLUTION: In the method for controlling a sheet cut length of a web type electronic printing machine 1 which cuts a band-shaped sheet 32 and transfers the sheet as cut sheets outside after printing patterns to the sheet, cut pulses for cutting the sheet 32 are generated at predetermined intervals in accordance with a stable speed of a transfer means for transferring the sheet. A stop sequence starts a predetermined time before a next cut pulse enters when printing is to be stopped. The sheet is cut according to the next cut pulse while a transfer speed of the transfer means decreases. Then a sheet 33 of a predetermined length is transferred, and the transfer means stops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the sheet cut length at the start of printing and at the end of printing by changing the control timing of a drive motor at the start of printing and at the end of printing of a web-type electronic printing press. The present invention relates to a control method and an apparatus for controlling

[0002]

2. Description of the Related Art Conventionally, a web-type printing machine has a paper feeding section for conveying a sheet wound on a bobbin to a printing section having a photosensitive drum or the like, and a cutting section for cutting the sheet into predetermined sheets by a predetermined amount. Having a predetermined amount of margin before and after a sheet on which a picture is printed from the printing section, so that the cut sheet can be sequentially conveyed to a bookbinding section arranged downstream. Have been.

If the cutting section is arranged upstream of the printing section, cut sheets are sequentially sent to the printing section, so there is no need to use a web type. Further, since the sheets are not continuous, the occurrence of jams can be avoided. In order to perform high-speed printing by sequentially transporting cut sheets to a printing unit, a high level of technology is required. Therefore, in the case of a web-type printing machine, the cutting unit is arranged downstream of the printing unit, and the sheet feeding drag roller arranged downstream of the printing unit in order to perform high-speed conveyance of the continuous sheet. It is necessary to perform the initial setting so that the feeding is completely performed.

In the printing unit, in the case of multi-color printing, for example, the printing roller is conveyed at such a speed that the printing positions of cyan, magenta, yellow, and black are synchronized with the same position. The transport unit having
Care must be taken not to affect the load on the sheet conveyance drive unit in the printing unit. Usually, a mechanical buffer mechanism is provided to have a pool portion for the sheet conveyed from the printing unit, The sheet is conveyed under control so that the sheet does not accumulate too much.

Further, in order to perform high-speed printing, it is necessary to raise the driving speed of the above-mentioned sheet conveyance driving unit to a predetermined value, which has a time lag. Due to these circumstances, it is necessary to cut an extra portion (preceding unprinted portion) downstream from the first pattern in order to create a cut sheet on which the first pattern is printed at the time of printing the first sheet. In order to complete the printing, it is necessary to stop the sheet transport drive unit in a state where the sheet can be transported to the drag roller of the transport unit downstream of the printing unit.

[0006]

On the other hand, the sheet cutter of the cutting section guarantees the dimensional accuracy of the sheet cut length by cutting the sheet in synchronization with the sheet conveying speed of the sheet conveying drive section which is stable at high speed. can do. That is, considering the case where the sheet is stopped during high-speed stable printing by the sheet transport driving unit, if the sheet is cut after receiving a cut pulse generated at a cycle of a predetermined cut length in synchronization with high-speed stabilization, the sheet moves at high speed. So that the cut length becomes longer. Therefore, a predetermined response delay time Tc is provided,
By anticipating this, it is possible to cut with high accuracy. Further, in order to stably drive the sheet conveying speed at a high speed, the sheet conveying drive unit has a rising and falling characteristic of the driving motor speed, and the time lag of the dispersion of the stop position of the leading end of the sheet and the speed rising characteristic after resumption. Thus, even if the sheet cut length is the same, the length of the preceding unprinted portion to be cut is longer or shorter (for example, 50
0 mm to 10 mm).

[0007] These preceding unprinted portions are unnecessary for bookbinding, and before being conveyed to the bookbinding machine, a paper discharge passage different from the passage on the bookbinding machine side is provided, and a downstream side of the cutting section is provided. It is necessary to switch to the above-mentioned paper discharge passage side by the provided passage switching means to eliminate it. However, if the preceding non-printing portion is too short, it is not possible to provide a press allowance for pressing the sheet when cutting the sheet, and to discharge the sheet having an appropriate length to the discharge path after cutting the sheet having an appropriate length. ,
If the length of the preceding non-printing portion is long, the leading end of the sheet can be guided in the discharging direction by providing a discharging roller or a guide roller downstream of the passage switching means, but the discharging is not possible. If there is large variation in the printed part,
It is necessary to take into account the possibility that a large vector works in a direction other than the sheet discharging direction to cause the sheet to jam and make the sheet discharging difficult.

In view of the above circumstances, an object of the present invention is to provide a control method and apparatus for controlling the sheet cut length at the start of printing and at the end of printing to an appropriate length.
It is another object of the present invention to provide a control method and apparatus in which a leading end of a band-shaped sheet is held at a position where it does not interfere with connection of an external device to a printing press. Another object of the present invention is to provide a transport control method and apparatus capable of transporting cut sheets without any trouble even when an external device is connected to a printing press.

[0009]

According to the present invention, a sheet cut length at the start of printing and at the end of printing is changed by changing the control timing of a drive motor at the start of printing and at the end of printing of a web-type electronic printing machine. The present invention relates to a control method and an apparatus for controlling the control of a computer.

[0010] The invention according to claims 1 and 4 is a method for controlling a sheet cut length of a web-type electronic printing machine which prints a picture on a belt-shaped sheet, cuts the sheet, and conveys the sheet as a cut sheet outside the apparatus. The common point is that the cut pulse for cutting the sheet is generated at predetermined intervals in accordance with the stable speed of the conveying means for conveying the sheet.

[0011] A cut pulse for cutting the belt-like sheet is
The sheet is generated at predetermined intervals corresponding to the stable speed of the conveying means for conveying the sheet, and as long as the sheet is cut under the stable speed, the sheet cutter delay time Tc
Thus, the cut sheet length can be obtained with high accuracy.

According to a first aspect of the present invention, there is provided a method for controlling a sheet cut length of a web-type electronic printing press, in which a pattern is printed on a belt-shaped sheet and then the sheet is cut and conveyed outside as a cut sheet. In the above, a cut pulse for cutting the sheet is generated at predetermined intervals corresponding to the stable speed of the conveying means for conveying the sheet, and at the start of printing, a start sequence is performed before a predetermined time before the first cut pulse arrives. Then, the transport means is driven and accelerated, and thereafter, the sheet cut operation is performed by the first cut pulse.

As described above, the cut sheet length can be accurately obtained by considering the sheet cutter delay time Tc in the cut pulse generated at a predetermined interval corresponding to the stable speed of the conveying means. At the start of printing, in the sheet cutter delay time Tc after the arrival of the cut pulse, the transport speed of the transport unit is slow, and the sheet feed amount is insufficient at a predetermined cut pulse cycle. The leading end of the sheet cannot be conveyed from the position 14 to the position of the conveying rollers 12 and 13. Further, the leading end of the sheet cannot be conveyed from the position of the sheet cutter 14 to the position of the conveying rollers 24 and 25 in FIG.

Therefore, by entering the start-up sequence a predetermined time before the first cut pulse arrives, the leading edge of the belt-shaped sheet is moved from the position of the sheet cutter 14 to the position of the conveying rollers 12, 13 or the position of the conveying rollers 24, 25. The cut sheet can be conveyed to the outside of the machine by driving the conveying means continuously.

It is an effective means of the first invention that the sheet cutting operation is performed during acceleration of the conveying means. By performing the sheet cutting operation during acceleration, the amount of conveyance from the sheet cutter can be reduced, and this is a means applied when the cut sheet length is short.

It is also an effective means of the first invention that the sheet cutting operation is performed by the first cut pulse at the end of the acceleration of the conveying means or after the end of the acceleration. By performing the sheet cutting operation after the end of the acceleration of the conveying unit, the conveying amount from the sheet cutter can be increased, and this unit is applied when the cut sheet length is long.

According to a second aspect of the present invention, when printing is stopped, a stop sequence is entered a predetermined time before the next cut pulse arrives, and the next cut is performed while the transport speed of the transport unit is decelerating. After a sheet cutting operation is performed by a pulse, a sheet of a predetermined length is conveyed, and the conveying means stops.

As described above, the cut sheet length can be accurately obtained by considering the sheet cutter delay time Tc in the cut pulse generated at a predetermined interval corresponding to the stable speed of the conveying means. When a stop signal is received, the conveyance means enters a stop sequence, and the conveyance speed is reduced, so that the sheet cutter delay time T
Even if c is expected, the transport amount is insufficient. Therefore, by entering the stop sequence a predetermined time before the next cut pulse arrives, the transport amount can be guaranteed. In addition, by conveying a sheet having a predetermined length after the sheet is cut and stopping the conveying unit, the leading end of the belt-shaped sheet can be stopped at a predetermined position. Therefore, a predetermined cut sheet length can be cut with high accuracy when printing is stopped in high-speed printing, and the position of the leading end of the band-shaped sheet can be determined with high accuracy.

A third invention according to claim 5 is an apparatus invention in which an external device is connected to a printing press. Claim 5 is a sheet-cut length control device of a web-type electronic printing machine that prints a picture on a strip-shaped sheet, cuts the sheet, and conveys the cut-sheet to an external device, wherein the picture is printed on the strip-shaped sheet. A printing unit that prints, a first driving unit that prints a pattern on the band-shaped sheet and conveys the band-shaped sheet, and a second driving unit that conveys and drives the band-shaped sheet via the printing unit. A sheet cutter arranged downstream of the second driving means for cutting into a sheet length using the strip-shaped sheet, a discharge opening formed downstream of the sheet cutter, and disposed inside the discharge opening; And a timing controller that generates a cut pulse for cutting the sheet at predetermined intervals corresponding to a sheet length to be used and a stable conveyance speed for conveying the sheet. A driving circuit for controlling the operation of the first driving means and the second driving means, and the external device has a sheet receiving port corresponding to the discharge opening, and the internal sheet placing portion is provided from the receiving port. A transfer passage communicating with the
A sheet conveying means provided in the conveying passage, wherein the sheet is held by the conveying roller and the sheet conveying means when the sheet is cut.

According to the third aspect of the present invention, the cut sheet is held by the conveying rollers of the printing press and the sheet conveying means of the external device, so that the cut sheet can be reliably conveyed to the external device side.

A fourth invention according to claim 6 is an apparatus invention for realizing the first invention according to claim 1. And
In a sheet cut length control device of a web-type electronic printing machine that cuts the sheet after printing a pattern on a band-shaped sheet and conveys the sheet as a cut sheet, a printing unit that prints a pattern on the band-shaped sheet, A first method of printing a picture on a belt-shaped sheet and conveying and driving the belt-shaped sheet;
A driving unit, a second driving unit that conveys and drives the band-shaped sheet via the printing unit, and a sheet cutter that is disposed downstream of the second driving unit and cuts into a sheet length using the band-shaped sheet. A timing control device for generating a cut pulse for cutting the sheet at a predetermined interval corresponding to a sheet length to be used and a stable conveyance speed for conveying the sheet, and an operation circuit for controlling the operation of the first drive unit and the second drive unit And a synchronization circuit that receives the cut pulse information and a print stop command and sends a signal to the operation circuit.

The fourth invention is characterized in that a picture is printed on the strip-shaped sheet and the strip-shaped sheet is transported and driven.
Since both the driving unit and the second driving unit that conveys and drives the band-shaped sheet via the printing unit are controlled by the operation circuit, the band-shaped sheet can be conveyed with high accuracy. Also, since the synchronous circuit receives the information of the cut pulse generated by the timing control device and the print stop command,
A control signal can be transmitted to the operation circuit by easily forming a signal in consideration of the cut pulse cycle.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram for explaining the rising and falling characteristics of a sheet conveying drive device used in the present embodiment and a cutter pulse for controlling a sheet cutter. FIG. 3 is an explanatory diagram for explaining the stop position and the stop timing of the sheet. FIG. 4 is an explanatory diagram for explaining the control at the start of printing when there is a stacker. FIG. FIG.

FIG. 1 shows an apparatus for transferring a cut sheet 33 from the electronic printing machine 1 to the bookbinding machine 23 between the web-type electronic printing machine 1 and a bookbinding machine 23 having a paper discharge section 28. It has been disclosed.

In the electronic printing press 1, a belt-shaped sheet 32 is supplied from a sheet supply unit (not shown) in the direction of arrow 39, and faces cyan, magenta, yellow,
Photoconductor drums D1, D2, D corresponding to four colors of black
3 and D4 are rotatably arranged. In addition, these 4
A charging device, a developing device, a cleaner for removing residual toner, which is disposed around each of the photosensitive drums,
The transfer lower provided on the back surface of the sheet is omitted.
Then, the sheet 32 is sandwiched between the photosensitive drum and the transfer roller, and the sheet 32 is rotated by rotation of the photosensitive drum.
Can be conveyed in the direction of arrow 39.

Drawing devices 5, 6, 7, and 8 for exposing an image on the surface of the photosensitive drums D1 to D4, respectively.
Are arranged to form a printing unit 35, and these drawing devices 5 to 5
Numerals 8 are connected to a data drawing device 20, respectively, so that a latent image can be formed on a photosensitive drum by a data signal from the data drawing device 20, and the developing device develops the latent image to form a toner image. The transfer roller is configured to transfer the toner image onto the sheet 32.

The photosensitive drums D1 to D4 are required to have a stable drum speed which is a rotation speed in synchronization with the exposure speed of the drawing devices 5 to 8, and the toner on the photosensitive drum 1 is kept under the stable drum speed. The toner image on the succeeding photosensitive drum is transferred to the preceding toner image such that the image is transferred onto the sheet 32 and then the toner image on the photosensitive drum D2 is transferred in conformity with the toner image on the photosensitive drum D1. The drawing devices 5 to 8 control the data drawing device 20 so that the drawing devices 5 to 8 operate synchronously with a predetermined time lag so as to coincide with the predetermined accuracy.

Therefore, each of the photosensitive drums D1 to D4 is configured to be rotatable and driven by a servomotor 17, and the servomotor 17 is configured to be controlled by a printing press operation circuit 16 to a stable speed after a lapse of a rising section. I have.
The operation start and stop of the operation circuit 16 are controlled by a start / stop synchronization circuit 19 for inputting a cutter pulse from a cutter timing control device 21 which will be described later. The driving of the motor 17 is started.

The operation start command / operation stop command 22
A signal is sent to the operation / stop synchronization circuit 19 and the data drawing device 20 via an ON / OFF switch or the like (not shown), and the data drawing device 20 generates a servomotor after a time lag after the rise time of the servomotor 17 has elapsed. 1
An operation start signal is sent to the drawing devices 5 to 8 so as to synchronize under the stable speed of 7, and the operation of the drawing devices 5 to 8 is controlled to stop sequentially after exposing the final pattern based on the operation stop command. .

Further, on the downstream side of the printing section 35, a heat roller 9 for fixing and a pressing roller 3 are provided via a guide roller 36.
And a tension roller 3 that can swing in the direction of the arrow in accordance with the amount of feeding of the sheet 32 on which fixing has been completed.
8 are arranged. Further, drag rollers 10 and 11 are disposed further downstream thereof so as to be rotatable by a servomotor 18 controlled by a printing press operation circuit 16.

The servo motor 18 conveys the sheet 32 on which fixing has been completed to the downstream side at a predetermined speed, and is controlled by the printing press operation circuit 16 so that a stable speed after the rising time lag is maintained. A sheet cutter 14 is disposed downstream of the drag roller 10.
4 is controlled by the cutter timing control device 21 so as to operate by a cutter pulse capable of cutting the sheet 32 for each predetermined amount conveyed in synchronization with the stable speed by the drag rollers 10 and 11 after the operation start command.

The discharge opening 1 is located downstream of the sheet cutter 14.
a, and transport rollers 12 and 13 rotatable at a slightly higher rotation speed than the drum rollers 10 and 11 are arranged inside the discharge opening 1a with a drive source (not shown) via appropriate friction. The transport rollers 12,
Reference numeral 13 denotes a bookbinding machine 23, which will be described later, and conveyance rollers 24, 2
According to 5, in the case of a configuration that can be pinched, it is needless to say that a guide roller may be used instead of a transport roller.

Next, the bookbinding machine 23 will be described. A receiving opening is opened in the bookbinding machine 23 so as to face the discharge opening 1a.
Conveyance rollers 24 and 25 rotatable at a rotation speed slightly higher than 2 and 13 are arranged with a drive source (not shown) via appropriate friction. A jam sensor 34 is provided at the entrance side of the transport rollers 24 and 25, and a guide roller 2 is provided at the downstream side.
6 and 27 are arranged, and the cut sheet 33 cut by the sheet cutter 14 can be received by the sheet placement unit 31 by the inertial conveyance force of the conveyance rollers 24 and 25.

On the other hand, on the upstream side of the conveying rollers 24 and 25, a path switching means 30 is disposed so as to be able to switch the path between the sheet placing section 31 and the sheet discharging section 28 by an electromagnetic cylinder or the like (not shown). Therefore, in the electronic printing machine 1, the sheet 32 in which the leading end of the sheet is nipped by the transport rollers 12 and 13 and the sheet 32 is initially set has the path switching unit 30 in which the sheet discharging unit 18 switches the path to the 28 side. In this state, the rotation of the servo motors 17 and 18 is started according to the operation start command. If the stable speed is not reached due to the rising characteristic, the sheet cutter 14 cuts the sheet in a cycle synchronized with the stable speed. The sheet is the paper output unit 2
It is discharged to 8.

Then, in synchronization with the time when the two motors 17 and 18 reach the stable speed, the passage switching means 30 is lowered and the passage is switched to the sheet placing portion 31 so that the cut sheet 33 is moved to the sheet placing portion 31. It is constituted so that it may be integrated in.

Next, a sheet cut length control method will be described with reference to FIGS. 2, 3, 4, and 5. FIG. As shown in FIG. 2A, the servomotor 17 is connected to the photosensitive drums D1 to D4 via a gear train as appropriate, and the servomotor is connected to the drag rollers 10, 11 via a gear train as appropriate. 18 has a stable speed range S2 between an acceleration range S1 at the time of rising and a deceleration range S3 at the time of falling.
Further, as shown in (b), the cutter pulse is generated based on the top and bottom register setting and the cut length setting regardless of the operation / stop of the printing press. That is, a cutter pulse is generated so that the sheet is cut to a cut length determined based on a predetermined sheet cut size except during register adjustment. The cutter pulse period T is determined as follows: T = A / V (1) where printing speed V and cut length A are used.

FIG. 3 shows the printing machine 1 so that the leading end of the sheet 32 does not interfere with the bookbinding machine 23 connected to the electronic printing machine 1.
1 shows an embodiment of a sheet cueing method in which the sheet is stopped without protruding too much from the discharge opening 1a. A belt-like sheet 32 is discharged from a printing unit 35 from a sheet supply unit (not shown) to a discharge opening 1.
The sheet is disposed so as to be able to be conveyed up to a, and the leading end of the sheet is set near the discharge opening 1a. In this state, no picture is printed on the preceding non-printing portion from the leading end of the sheet to the photosensitive drum D1 of the printing unit 35.
When a print start command is input, the preceding unprinted portion needs to be cut as unnecessary and then discharged to the discharge unit 28.

Therefore, the initial position of the sheet leading end is
In a state where the sheet 32 is not cut by opening the sheet cutter 14, it is necessary that the sheet 32 is securely clamped by the transport rollers 12 and 13. It is necessary that the protrusion does not protrude much from the discharge opening 1a of the printing press 1 so as not to hinder the mounting of the printer.

Therefore, as shown in FIG. 3A, if there is a delay of the delay time Td as a control error of the circuit system, the sheet running length between Td is V · Td, and the sheet travel length from the sheet cutter 14 to the direction of the bookbinding machine is changed. Stopping distance M toward
Satisfies M = L3 + L4 + L5-V · Td (2)

Then, as shown in FIG. 3 (b), the stop sequence start timing is defined as "Ts1 before the last cutter pulse", and the stop is started after the deceleration time Te from the start of the stop sequence. Assuming that the drag speed Vd, the deceleration curve Cu1, the time t, and the sheet cutter operation delay time Tc, Cu1 = (Vd / Te) · t (3), and the stopping distance M = ∫Cu1dt [Te-Ts1-Tc] … (4) Therefore, if Ts1 is calculated from the equation (4) and the stop sequence is entered before Ts1 at which the next cutter pulse is input, the leading end of the sheet 32 can be stopped at the stop distance M, which is necessary in this state. The bookbinding machine 23 is not disturbed by the leading end of the sheet 32 according to the
Can be connected.

Next, a second embodiment of the sheet cueing method when the bookbinding machine 23 is connected to the electronic printing press 1 will be described with reference to FIG. When the bookbinding machine 23 is connected, the first
It is necessary to make the leading end of the sheet 32 enter the inside of the bookbinding machine 23 more than in the embodiment.

That is, as shown in FIG.
It is necessary that the cutting position of the sheet 2 is such that the leading end of the sheet leaves the sheet cutter 14 more than in the first embodiment and is held by the conveying rollers 24 and 25 of the bookbinding machine 23. That is, if the rear end of the cut sheet 33 is not held by the conveying rollers 24 and 25, and the trailing end of the cut sheet 33 comes off the conveying rollers 12 and 13 on the printing press side, the sheet is not conveyed.

The distance L7 between the sheet cutter 14 and the sheet leading end does not need to exceed the length of the longest cut sheet. For example, assuming that the shortest cut sheet length is A4 size horizontal length and the longest cut sheet length is twice as long as A3 size length, 210 mm length is required for A4 size width and twice as long as A3 size length. Is 210mm ×
4 = 840 mm. Actually, even if the cutter delay time Td and the like are considered, it is not necessary to exceed 850 mm.

After the preceding unprinted portion is discharged to the paper discharge portion 28, the leading end portion of the sheet and the sheet cutter 14 when the printed portion used for bookbinding, on which a picture is printed, is cut. Assuming that there is a delay of the delay time Td as a control error between the input of the command and the start of the operation, the sheet running length between Td is V · Td, and N> L1 + L2 + L3 + L4 + V · Td (5) Target.

Then, as shown in FIG. 4B, the operation sequence start timing is defined as "Ts2 before the last cutter pulse", and it is assumed that a stable speed is reached after acceleration time Ta from the start of the operation sequence. , Paper discharge drag speed Vd, acceleration curve Cu2, time t, and sheet cutter operation delay time Tc, Cu2 = (Vd / Ta) · t (6), and stopping distance N = ∫Cu2dt [Te] + {(Ts2−Ta) + Tc} × Vd (7) Assuming that it is necessary to satisfy the following equation, N is determined by the above equation (5), and Ts2 is calculated from the equation (7).
If the acceleration sequence starts before Ts2 when the first cutter pulse is input, the leading end of the sheet 32 can be stopped at the target distance N.

When a cutter pulse arrives at the same time as or after the end of the acceleration time Ta, regular printing may be continued and the sheet may be cut based on the cutter pulse.

The path switching means 3 shown in FIG.
The paper discharge unit 28 having 0 may be provided between the transport rollers 24 and 25 and the guide rollers 26 and 27 by the passage switching unit 30. In this case, when printing is started in the state shown in FIG.
After the preceding non-printing portion is removed to the paper discharge portion by the passage switching means 30 provided downstream of the printer, the passage can be switched to convey the portion on which the regular pattern is printed to the bookbinding machine side.

Next, a third embodiment of the sheet cueing method in the case where a tray is arranged outside the discharge opening 1a of the electronic printer 1 will be described with reference to FIG. In this case, it is necessary to cut the sheet cut length L8 into a size not exceeding the size that can accommodate the tray (not shown), and the cueing of the sheet is performed if the tray is long enough to receive the sheet. Well, substantially, the transport rollers 12, 1
3 as long as it can be transported.

Now, the preceding non-printing portion is the discharge portion 2
The distance P between the leading end of the sheet and the sheet cutter 14 when the printed portion on which the pattern is printed after the sheet is discharged to the sheet 8 is cut by the sheet cutter 14 so that at least 13 must be sandwiched. Therefore, assuming that there is a delay of the delay time Td as a control error from the input of the command to the start of the operation, the sheet running length between Td is V · Td, and the target is P = L5 + V · Td (8) I do.

Then, as shown in FIG. 5B, the operation sequence start timing is defined as "Ts3 before the last cutter pulse", and it is assumed that a stable speed is reached after acceleration time Ta from the start sequence start. , The discharge drag speed Vd, the acceleration curve Cu3, the time t, and the sheet cutter operation delay time Tc, Cu3 = (Vd / Ta) · t (9), and the stopping distance P = ∫Cu3dt [Ts3 + Tc] (10) must be satisfied. Therefore, from equation (10), Ts3
Is calculated, and the start sequence is started before Ts3 when the first cutter pulse is input, the leading end of the sheet 32 can be stopped at the target distance P.

When a cutter pulse arrives before the end of the acceleration time Ta, it waits until a cutter pulse arrives at the same time as or after the end of the acceleration time Ta, and thereafter, enters a regular operation. Printing may be continued and sheet cutting may be performed based on the cutter pulse.

In the above-described embodiment, if the cutter pulse cycle ends during the acceleration or deceleration sequence and a cutter pulse is generated depending on the size of the cut sheet to be used, the cutter pulse is masked in advance and the sequence is performed. It is, of course, necessary to release the mask after completion.

[0054]

As described above in detail, according to the first aspect of the present invention, the start sequence is started a predetermined time before the first cut pulse arrives, so that the position of the conveying roller is shifted from the position of the sheet cutter. The cut sheet can be conveyed to the outside of the machine by the continuous driving of the conveying means.

Further, according to the second aspect of the present invention, it is possible to cut a predetermined cut sheet length with high accuracy when printing is stopped in high-speed printing, and to determine the position of the leading end of the band-like sheet with high accuracy. it can.

According to the third aspect of the present invention, since the cut sheet is held by the conveying rollers of the printing press and the sheet conveying means of the external device, the cut sheet is reliably conveyed to the external device side. be able to.

According to a fourth aspect of the present invention, a first driving means for printing a picture on the strip-shaped sheet and for conveying and driving the strip-shaped sheet, and for driving the strip-shaped sheet via the printing section, Since both the driving means and the second driving means for driving the conveyance are controlled by the operation circuit, the belt-shaped sheet can be conveyed with high accuracy, and the synchronization circuit can control the information of the cut pulse generated by the timing control device and the print stop command. Therefore, it is possible to easily form a signal in consideration of the cut pulse cycle and transmit a control signal to the operation circuit.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram illustrating rising and falling characteristics of a sheet conveyance driving device used in the present embodiment and cutter pulses for controlling a sheet cutter.

FIG. 3 is an explanatory diagram illustrating a stop position and a stop timing of a sheet.

FIG. 4 is an explanatory diagram illustrating printing start control when a stacker is present.

FIG. 5 is an explanatory diagram illustrating control at the time of starting printing when there is no stacker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic printing machine 16 Printing press operation circuit (operation circuit) 17 Servo motor (1st drive means) 18 Servo motor (2nd drive means) 19 Start / stop synchronous circuit (synchronous circuit) 23 Bookbinding machine

Claims (6)

[Claims] 1. A method for controlling a sheet cut length of a web-type electronic printing machine that cuts a sheet after printing a pattern on a belt-shaped sheet and conveys the sheet as a cut sheet outside the apparatus, comprising: At a predetermined interval corresponding to the stable speed of the conveyance means for conveying the sheet, at the start of printing, a start sequence is performed a predetermined time before the first cut pulse arrives, and the conveyance means is driven and accelerated. A sheet cut length control method for a web-type electronic printing machine, wherein a sheet cut operation is performed by the first cut pulse thereafter. 2. The method according to claim 1, wherein a sheet cutting operation is performed during acceleration of the conveying means. 3. The method of controlling a sheet cut length of a web-type electronic printing press according to claim 2, wherein the sheet cut operation is performed by the first cut pulse at the end of or after the acceleration of the transport unit. 4. A method for controlling a sheet cut length of a web-type electronic printing machine that prints a picture on a belt-shaped sheet and then cuts the sheet and conveys the sheet as a cut sheet outside the apparatus. The sheet is generated at a predetermined interval corresponding to the stable speed of the conveying means for conveying the sheet, and when printing is stopped, a stop sequence is entered a predetermined time before the next cut pulse arrives, and the conveying speed of the conveying means is decreasing. A sheet cut operation is performed by the next cut pulse, and then a sheet of a predetermined length is conveyed, and the conveying means stops, wherein a sheet cut length control method for a web-type electronic printing machine is provided. 5. A sheet cut length control device of a web-type electronic printing machine for printing a picture on a strip-shaped sheet and then cutting the sheet and conveying the cut sheet to an external device as a cut sheet, wherein the picture is printed on the strip-shaped sheet. A printing unit, a first driving unit that prints a picture on the band-shaped sheet and conveys and drives the band-shaped sheet, a second driving unit that conveys and drives the band-shaped sheet via the printing unit, A sheet cutter that is disposed downstream of the second driving means and cuts to a sheet length using the strip-shaped sheet; a discharge opening that is opened downstream of the sheet cutter; and a discharge opening that is disposed inside the discharge opening. And a timing controller that generates a cut pulse for cutting the sheet at predetermined intervals according to a sheet length to be used and a stable conveyance speed for conveying the sheet. An operation circuit for controlling the operation of the first driving means and the second driving means; and the external device has a sheet receiving port corresponding to the discharge opening, and a sheet is placed on the inside from the receiving port. And a sheet conveying means provided in the conveying path, wherein the sheet is held by the conveying rollers and the sheet conveying means when the sheet is cut. Cut length control device. 6. A sheet cut length control device of a web-type electronic printing machine for printing a pattern on a band-shaped sheet and then cutting the sheet and conveying the cut sheet as a cut sheet, wherein the pattern is printed on the band-shaped sheet. A printing unit, a first driving unit that prints a pattern on the band-shaped sheet and conveys and drives the band-shaped sheet, a second driving unit that conveys and drives the band-shaped sheet via the printing unit, (2) a sheet cutter disposed on the downstream side of the driving means and configured to cut the sheet into a sheet length using the strip-shaped sheet; and a cut configured to cut the sheet at predetermined intervals corresponding to the sheet length to be used and the stable conveyance speed for conveying the sheet. A timing control device that generates a pulse, an operation circuit that controls the operation of the first driving unit and the second driving unit, the cut pulse information, and a print stop command. Only, sheet cut length control apparatus of a web-type electronic printing machine is characterized in that a synchronizing circuit for sending a signal to the driving circuit.