CN105015156B - Intermittent forward direction leapfrog printing machine and its control method and leapfrog draft gear - Google Patents
Intermittent forward direction leapfrog printing machine and its control method and leapfrog draft gear Download PDFInfo
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- CN105015156B CN105015156B CN201510431962.7A CN201510431962A CN105015156B CN 105015156 B CN105015156 B CN 105015156B CN 201510431962 A CN201510431962 A CN 201510431962A CN 105015156 B CN105015156 B CN 105015156B
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Abstract
The present invention relates to a kind of intermittent positive leapfrog printing machine and its control method and leapfrog draft gears, the printing machine includes paper feed leapfrog dragger, paper delivery leapfrog dragger and the two groups of red ink paste used for seals groups in rack, wherein, two groups of red ink paste used for seals groups are located between paper feed leapfrog dragger and paper delivery leapfrog dragger, centre-to-centre spacing between two groups of red ink paste used for seals groups is L, and the single print couples of L=are repeated print the odd-multiple of pattern width length：The every paper feeding length S=V for turning a cycle of printing plate1×T1+V2×T2.It using the present invention, completes in a leapfrog and prints twice, print speed printing speed is doubled than the batch process of traditional retrusive paper feed, and can realize the multiplication of print repeat length range.
Description
Technical Field
The invention relates to the technical field of printing equipment, in particular to an intermittent forward jumping printing machine and a control method thereof, and further relates to a jumping traction device.
Background
With the increasing demand for printing accuracy of printed matters such as stickers, liquid liquor packaging boxes (e.g., liquors), and the like, the intermittent web printing machine has become an important means and approach for high-accuracy, low-cost printing. It has a higher printing accuracy, lower plate making costs, and a more flexible adaptation than other web printing presses favored by many printing enterprises.
In the above-mentioned prior art batch printing technique, feeding means of feeding intermittently and then pouring slightly is usually adopted, as shown in fig. 2, and this feeding means is mainly adopted because the PS offset plate 20 in the printing color group is wrapped on the printing cylinder 30, and the PS offset plate wrapped on the printing cylinder is inevitably provided with a blank gap depending on the fixing manner thereof, so that the PS offset plate cannot fully wrap the surface of the roller. As shown in fig. 2, a is a printing region and B is a non-printing region. In order to reduce waste of blank gaps on paper caused by the gap parts of the PS offset plate as much as possible, the technical means adopted at present is that a small amount of material needs to be poured back intermittently in the paper feeding process so as to realize the compensation of the gap and the blank. Another problem that arises with this method is that it is frequently necessary to back down a little during the feeding of the printing sheets. This reduces the printing speed, accelerates wear of the rotary press, and reduces the life of the rotary press.
Furthermore, when the user is to print large, long runs, the unlimited increase in roll size is not practical in terms of technical and equipment costs due to the large limitations on roll circumference.
At present, no paper conveying device and method for an intermittent printing machine capable of changing the intermittent feeding and a little pouring exist at home and abroad.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and realize the multiplication of the range of the printing repetition length and the multiplication of the intermittent printing speed.
To achieve the above object, the present invention provides an intermittent forward skip printing press, a sheet feeding device using the intermittent forward skip printing press and a printing press using the sheet feeding device, and an intermittent forward skip control method.
The technical scheme of the invention is as follows:
an intermittent forward skip printing press comprising: the paper feeding skip step tractor, the paper discharging skip step tractor and two groups of printing groups are all arranged on the frame, wherein the two groups of printing groups are positioned between the paper feeding skip step tractor and the paper discharging skip step tractor, and the center distance L between the two adjacent printing groups is equal to the odd multiple of the length of the repeated printing pattern of a single printing group
Paper feed length per printing cycle: s ═ V1×T1+V2×T2(ii) a In the formula (I);
V1the speed at which the printing cylinder of the printing couple is moving through the printing zone;
T1the time taken for the printing cylinder of a print couple to travel through the printing zone;
V2the speed at which the printing cylinder of the print couple is rotated past the sheet in the non-printing zone;
T2the time it takes for a printing cylinder of a color group to travel past a sheet in the non-printing zone.
In the intermittent forward skip-step printing machine, the paper feeding skip-step tractor and the paper discharging skip-step tractor are respectively symmetrically arranged on two sides of the frame and synchronously run.
Wherein, in order to satisfy S ═ V1×T1+V2×T2Said V is2And V1May be equal; or, the V is2And V1Or may not be equal.
In the intermittent forward skip step printing machine, the paper feeding skip step traction machine and the paper discharging skip step traction machine respectively comprise a driving traction roller and a driven traction roller which are arranged in pairs, and the driving traction roller is connected with an output shaft of the stepping motor.
In above-mentioned intermittent type formula forward leapfrog printing machine the front end of paper feed leapfrog tractor and the rear end of going out paper leapfrog tractor are equipped with straining device respectively, straining device sets up before the paper feed leapfrog tractor to and go out paper after the leapfrog tractor, straining device is including setting up a pair of backing roll in the frame be equipped with the counter weight roller between a pair of backing roll, the both ends of counter weight roller are equipped with the slider respectively, slider and the spout sliding fit who sets up in the frame.
The invention also provides an intermittent forward skipping control method, which adopts two groups of printing groups to ensure that paper is printed at a speed V in the time period when a printing cylinder of the printing group rotates through a printing area to receive printing1Advancing the sheet at a speed V during a period of time during which a printing cylinder of the impression group is not accepting printing by rotating past the non-printing zone2Advancing, by control of program V2、V1The rotating speed of the printing cylinder is kept unchanged in the whole printing process; the paper advancing speed is drawn by a paper feeding skip step traction machine and a paper discharging skip step traction machine which are respectively arranged at two sides of the two printing groups and run synchronously.
In the intermittent forward skip control method, the printing patterns attached to the printing cylinders of the two printing color sets are the same pattern or different but continuous patterns.
The invention also provides a skipping traction device which comprises a paper feeding skipping traction machine and a paper discharging skipping traction machine which are arranged on the frame and synchronously run, wherein the paper feeding skipping traction machine and the paper discharging skipping traction machine control paper to be respectively V-shaped through the control unit1Velocity sum V2Alternately advancing at speed, with the paper sheet V1The speed is changed from the first set position to the second set position and then V2The speed is changed from the second set position to the third set position, and the paper is fed at V1Time taken for speed to travel T1For working time, the paper is represented by V2Time taken for speed to travel T2The control unit is used for outputting control signals for quick feeding time, and the driving motors in the paper feeding skip step traction machine and the paper discharging skip step traction machine receive the control signals to drive the paper feeding actuating mechanism. Wherein, V2Not necessarily equal to V1I.e. V2May be equal to V1Or may be V2Is not equal to V1。
The invention adopts two groups of printing groups to continuously print, after one group of printing groups prints a pattern, namely after a roller rotates through a printing area wrapped with a PS plate, the feeding speed of paper is accelerated through a traction mechanism, so that the paper just reaches the initial end position of the printing area wrapped with the PS plate on the roller of the next printing group after the roller rotates through the printing area not wrapped with the PS plate. Therefore, the invention can avoid the need to rewind the paper backwards during the printing feed. Thus, the gap left on the paper in the non-printing area on the printing roller can be eliminated, the waste of the paper is eliminated, a part of the paper does not need to be frequently poured back a little in the printing feeding process, and the feeding mode of accelerating forward is adopted. By adopting the feeding mode, the printing speed is improved, and the pressure of a power system is reduced. Meanwhile, two patterns can be printed on the paper tightly, continuously and continuously without traces. The intermittent forward skip printing machine and the control method thereof realize multiplication of a printing repetition length range and multiplication of intermittent printing speed.
Furthermore, by using the intermittent forward skip printing press with the present invention, the traction force in the sheet feeder can be more balanced. That is, since the paper feeding skip tractor and the paper discharging skip tractor are respectively provided on both sides of the paper feeding side and the paper discharging side after the paper feeding tractor and before the paper discharging tractor, the traction forces at both ends of the printing color group are balanced, and thus the printing device can be used for printing various sizes of paper, particularly wide paper.
By using the printing machine of the invention, great improvements in printing speed, repeat length, equipment cost, mechanical life and the like can be realized.
Drawings
FIG. 1 is a schematic view of the intermittent forward skip printing press of the present invention;
FIG. 2 is a schematic view of a PS offset plate package with a gap on a printing cylinder according to the prior art.
In fig. 1: 1. an unreeling machine; 2. a paper feeding tractor, 3, a front tension device; 4. a paper feeding skip step tractor; 5. printing color groups; 6. a paper-out jumping tractor; 7. a post-tensioning device; 8. a paper output tractor; 9. a winding machine; 10. and a frame.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the following description is only for the purpose of illustrating the principles of the present invention and is not intended to limit the present invention.
Aiming at the problems that the prior art utilizes 'rebound' to adjust the printing gap to meet the complex and low efficiency of the traditional method for non-blank printing, the invention creatively provides 'forward jump', makes essential improvement on the traditional continuous printing production line and realizes the technical effect of greatly improving the equipment utilization rate and the printing efficiency.
As shown in figure 1: the intermittent forward skip printing machine comprises an unreeling machine 1, a paper feeding tractor 2, a front tensioning device 3, a paper feeding skip tractor 4, two printing groups 5, a paper discharging skip tractor 6, a rear tensioning device 7, a paper discharging tractor 8 and a winding machine 9 which are arranged in sequence, wherein the devices are all arranged on a rack 10.
In fig. 1, the two printing groups 5 are located between the paper feeding skip tractor 4 and the paper discharging skip tractor 6, and the center distance between two adjacent printing groups 5 is L, so that
L is an odd multiple of the repeat printing pattern width length of a single printing color group
Paper feed length per printing cycle: s ═ V1×T1+V2×T2(ii) a Wherein: v2Not necessarily equal to V1In the formula (I);
V1the speed at which the printing cylinder of the printing couple is moving through the printing zone;
T1the time taken for the printing cylinder of a print couple to travel through the printing zone;
V2the speed at which the printing cylinder of the print couple is rotated past the sheet in the non-printing zone;
T2the time taken for the printing cylinder of the printing couple to travel across the sheets in the non-printing zone;
s2 x single print couple repeat print pattern web length.
Wherein: as long as S is satisfied1×T1+V2×T2，V2Not necessarily equal to V1。
The structure and operation of the intermittent forward skip printing press will be described in detail below.
Generally, since the PS offset plate in the printing couple 5 is wrapped around the cylinder and does not generally occupy the entire circumference of the cylinder, a "blank seam" (blank section) is formed between two adjacent printed images if the paper is fed forward during printing.
The present invention is intended to minimize to eliminate the seam width (width of the blank portion) between two adjacent patterns to maximize the use of paper and reduce paper waste. To this end, the invention makes use of the intermittent forward skip printing machine and, during the feeding, accelerates the forward feeding of the sheets after each pattern (swath) has been printed, the time taken to accelerate the forward feeding being equal to the time taken by the printing cylinder to rotate through the non-printing area. The product of the speed of the accelerated forward feed and the time taken to accelerate the forward feed, plus the arc length of the printing cylinder over the print zone should be equal to the distance between the centerlines of the two print couples. Of course, it is not necessary to accelerate the feeding after the last printed pattern is printed. The paper feeding mode, namely forward intermittent feeding, can realize the compensation of PS plate seams, eliminate the width of blank paper between two patterns, save paper and obviously improve the quotation speed. That is, the normal printing rotation speed is set when the forward intermittent type jumping machine feeds the paper forward, but the intermittent type forward jumping is called "intermittent type forward jumping pull" because the pulling speed of the paper is accelerated after printing a pattern, and the paper is pulled forward a part of the time quickly and then is changed to the rotation speed at the time of normal printing. The specific control mode of the speed of the paper in the feeding process is realized by controlling the driving servo motors in the paper feeding skip step traction machine 4 and the paper discharging skip step traction machine 6 through a control system.
In order to ensure the balance of the pulling force on the printed paper in the printing group, the paper feeding skip step tractor 4 and the paper discharging skip step tractor 6 are respectively symmetrically arranged on two sides of the frame 10 and synchronously run.
In order to ensure that the paper feeding process is stable and the deviation is not easy to occur, the paper feeding jump tractor 4 and the paper discharging jump tractor 6 respectively comprise a driving traction roller and a driven traction roller which are arranged in pairs, and the driving traction rollers are connected with an output shaft of a stepping motor.
In order to prevent the problem that the paper is lax in the in-process of pay-off from appearing the front end of paper feed skip step tractor and go out paper skip step tractor's rear end and be equipped with straining device 3, 7 respectively, straining device sets up before paper feed skip step tractor 4 to and go out paper skip step tractor 6 after, straining device 3, 7 are including setting up a pair of backing roll in frame 10 be equipped with the counter weight roller between a pair of backing roll, the both ends of counter weight roller are equipped with the slider respectively, slider and the spout sliding fit who sets up in frame 10. The sliding block and the sliding groove structure can ensure that the counterweight roller cannot fall off or swing.
As described above, the preceding feeding of the paper fed by the paper feeding tractor 2 can be accelerated by the intermittent forward skip device provided between the paper feeding tractor 2 and the printing color group 5, and specifically, the paper feeding skip tractor 4 and the paper discharging skip tractor 6 are mainly used to control the speed of the fed paper, and the tensioning mechanisms 3 and 7 are used to keep the paper in a tensioned state all the time.
In order to be able to convey the sheets mounted on the support 10 to the printing group 5 for printing, the sheet feeder 2 comprises a pair of sheet-feeding traction main driving rollers and a pair of sheet-feeding traction driven rollers arranged one above the other. The paper feeding traction main driving roller and the paper feeding traction driven roller are arranged between the two symmetrically arranged front wall boards. One end of the paper feeding traction main driving roller can be provided with an independent driving motor, and power can be transmitted to the paper feeding traction main driving roller through a transmission mechanism.
The paper feeding traction main driving roller synchronously stops feeding traction driving or synchronously accelerates traction during the action period of accelerating paper conveying of the intermittent forward skipping device. Preferably, an independent servo motor may be installed at one end of the main driving roller.
In order to be able to carry the paper after the printing of the pad 5 to the winder 9 installed on the bracket, the paper-out tractor 8 also comprises a pair of paper-out traction main driving rollers and a pair of paper-out traction driven rollers which are arranged up and down, and the paper-out traction main driving rollers and the paper-out traction driven rollers are installed between two back wall boards which are symmetrically arranged. One end of the paper-out traction main driving roller can be provided with an independent driving motor, and power can be transmitted to the paper-out traction main driving roller through a transmission machine.
The paper-out traction main driving roller synchronously stops the discharging traction driving or synchronously performs the accelerated traction during the action period of the intermittent forward skipping device for accelerating the paper. Preferably, an independent servo motor may be installed at one end of the main driving roller.
In fig. 1, the unreeling machine 1 may be a stand on which the paper is directly supported by a central reel of the reel, and the stand may be a rotary stand for facilitating paper replacement. Under the traction of the paper feeding tractor 2, the paper is sent to a printing color group for printing. A drying unit (not shown) may be provided in the printing group 5.
The winding machine 9 can comprise a support, paper is installed on the support through a winding drum center winding shaft, one end of the center winding shaft is connected with a winding driving machine, the paper is wound on the winding drum through the winding driving machine, and the support can be selected as a rotary supporting frame convenient for replacing the paper.
Therefore, by arranging the intermittent forward jumping device, forward intermittent feeding and accelerated feeding of paper can be realized, so that paper can be saved and printing efficiency can be obviously improved.
In addition, the intermittent forward jumping device for the paper conveying device can realize stable and centered feeding of paper due to the tensioning mechanism, so that the deviation of the paper in the feeding process is prevented.
Here, the printed substrate may be other commonly used printing substrates such as cloth, plastic plate, etc. besides paper, and herein, paper refers to any substrate to be printed.
The invention also relates to an intermittent forward skipping control method, which can adopt two groups of printing groups to ensure that paper is printed at a speed V in a period when a printing cylinder of the printing group rotates through a printing area to receive printing1Advancing the sheet at a speed V during a period of time during which a printing cylinder of the impression group is not accepting printing by rotating past the non-printing zone2Advancing, by control of program V2、V1The rotating speed of the printing cylinder is kept unchanged in the whole printing process; the paper advancing speed is drawn by a paper feeding skip step traction machine and a paper discharging skip step traction machine which are respectively arranged at two sides of the two printing groups and run synchronously. In this way, the gap between two adjacent printing groups can be enlarged, which is advantageous for the installation of printing aids, and above all for the increase of the printing speed and the simplification of the structure of the paper transport device of the printing press.
In order to enable the printing machine to print patterns with larger width, the printing patterns attached to the printing cylinders of two adjacent printing groups are the same pattern, or two different patterns, even twice as large as the original pattern. The printing process can be realized only on a printing machine provided with more than two printing color groups, and the effect can achieve the effects of tight pattern connection, good continuity and no seam marks.
The invention also relates to a skipping traction device, which comprises a paper feeding skipping traction machine 4 and a paper discharging skipping traction machine 6 which are arranged on the frame 10 and synchronously run, wherein the paper feeding skipping traction machine 4 and the paper discharging skipping traction machine 6 control paper to respectively take V through a control unit (not shown in the figure)1Velocity sum V2Alternately advancing at speed, with the paper sheet V1The speed is changed from the first set position to the second set position and then V2The speed is changed from the second set position to the third set position, and the paper is fed at V1Time taken for speed to travel T1For working time, the paper is represented by V2Time taken for speed to travel T2For fast feed time, wherein V2>V1For the control unitAnd when the control signal is output, the driving motors in the paper feeding skip step traction machine 4 and the paper discharging skip step traction machine 6 receive the control signal to drive the paper feeding actuating mechanism.
As can be seen from the above embodiments, the working mode of the present invention is:
the paper wound on the winding drum is supported on the support through the winding drum supporting center roller, a bearing is arranged between the winding drum supporting center roller and the support, the support can be a rotary support convenient for replacing the paper, and the unwinding machine 1 is formed by the structure.
After the paper is paid out by the unreeling machine 1, under the traction of the paper feeding tractor 2, the paper passes through an intermittent forward skip device composed of a front tensioning device 3, a paper feeding skip tractor 4, two printing color groups 5(1), 5(2) a paper discharging skip tractor 6, then passes through a rear tensioning device 7, under the traction of a paper discharging tractor 8, and finally the printed product is collected by a reeling machine 9.
The intermittent forward jumping device is used for controlling the paper fed into the printing color group 5 to feed paper normally and intermittently and quickly. The control mode is that a paper feeding skip step traction machine 4 and a paper discharging skip step traction machine 6 are adopted, and the rotating speed of a driving servo motor is controlled through a control program.
The paper feeding skip-step traction machine 4 and the paper discharging skip-step traction machine 6 are respectively symmetrically arranged on two sides of the frame 10 and synchronously run. The paper feeding skip-step tractor 4 and the paper discharging skip-step tractor 6 respectively comprise a driving traction roller and a driven traction roller which are arranged in pairs, the driving traction roller is driven by a stepping motor, and the driving traction roller is generally connected with an output shaft of the stepping motor.
The color printing group 5 can be an offset printing unit with 4 colors, 6 colors and the like. A drying unit (not shown) may be provided between the offset rollers of the print couple.
When the front and the back of the printing group 5 are respectively provided with a paper feeding skip step traction machine 4 and a paper discharging skip step traction machine 6, symmetrical positive intermittent traction is formed. This produces a balanced tensioning of the sheets running between the printing couples 5, which is the basic prerequisite for ensuring accurate register of the broad-width sheets in the printing couples.
Thus, in contrast to conventional intermittent printing presses, the invention provides a paper advance speed V in the printing zone in one jump (one revolution of the printing forme cylinder)1And a travel time T1Product of (d), plus the paper travel speed V in the non-printing area2And a travel time T2The product of (a). In particular under the control of a control program2Not necessarily equal to V1The rotating speed of the printing roller is kept unchanged in the whole printing process, and the advancing speed of the paper is realized by the traction of a paper feeding skip step traction machine and a paper discharging skip step traction machine which are respectively arranged at two sides of the two printing groups and run synchronously. Therefore, the invention has simple structure and can improve the printing speed by times; the outstanding effect of enlarging the printing repeat length can be multiplied.
In summary, the present invention achieves two major breakthrough changes:
two sets of printing plates can be used to print half of each, and the pattern with 2 times of single printing width length is spliced, so that the range of printing repetition length is doubled;
two colour groups with identical printing plates are equal to two prints in one jump, the printing speed is doubled compared with the traditional intermittent method of reverse feeding.
The present invention has been described above by way of examples, but the present invention is not limited to the above-described embodiments, and any obvious modifications or alterations to the above-described embodiments, which are made by those skilled in the art, should be included in the spirit of the present invention and the scope of protection of the appended claims.
Claims (10)
1. An intermittent forward skip printing press comprising:
a paper feeding skip step traction machine, a paper discharging skip step traction machine and two groups of color printing groups which are arranged on the frame, wherein,
the two groups of printing groups are positioned between the paper feeding skip step traction machine and the paper discharging skip step traction machine, the center distance between the two groups of printing groups is L, and L is an odd multiple of the length of the repeated printing pattern of a single printing group:
paper feeding length S ═ V of one cycle per revolution of printing plate1×T1+V2×T2(ii) a In the formula:
V1the speed at which the printing cylinder of the printing couple is moving through the printing zone;
T1the time taken for the printing cylinder of a print couple to travel through the printing zone;
V2the speed at which the printing cylinder of the print couple is rotated past the sheet in the non-printing zone;
T2the time taken for the printing cylinder of the printing couple to travel across the sheets in the non-printing zone;
s2 × single impression set repeats the print pattern web length.
2. The intermittent forward skip pass printing machine according to claim 1, wherein the paper feeding skip pass tractor and the paper discharging skip pass tractor are symmetrically disposed on both sides of the frame, respectively, and operate in synchronization.
3. The intermittent forward skip pass printing press of claim 1 or 2, wherein the paper-feed skip pass tractor and the paper-discharge skip pass tractor respectively comprise: the device comprises a driving traction roller and a driven traction roller which are arranged in pairs, wherein the driving traction roller is driven by a stepping motor.
4. The intermittent forward skip printing machine according to claim 3, wherein a tensioning mechanism is provided at a front end of the paper feeding skip tractor and at a rear end of the paper discharging skip tractor, respectively, the tensioning mechanism includes a pair of support rollers provided on the frame, a counter roller is provided between the pair of support rollers, and sliders are provided at both ends of the counter roller, respectively, the sliders being slidably engaged with a slide groove provided on the frame.
5. A batch forward skip press as recited in claim 3 further comprising a drying unit disposed between two print color sets.
6. An intermittent forward skip printing press as recited in claim 3 wherein said V2And V1Equal to, or, said V2And V1Not equal.
7. An intermittent forward skipping control method is characterized in that,
two printing groups are set to control the paper to be printed at speed V in the time interval when the printing cylinder of the printing group rotates past the printing area1Advancing;
controlling the paper to rotate at a speed V during a period of time when a printing cylinder of the printing couple is not receiving printing when rotating through a non-printing zone2Go ahead and control V by control program2And V1The rotating speed of the printing roller is kept unchanged in the whole printing process; wherein,
the paper advancing speed is drawn by a paper feeding skip step traction machine and a paper discharging skip step traction machine which are respectively arranged at two sides of the two printing groups and run synchronously, so that the center distance L between the two printing groups is equal to odd times of the length of the pattern repeatedly printed by the single printing group;
paper feed length S ═ V in each cycle1×T1+V2×T2(ii) a In the formula:
V1the speed at which the printing cylinder of the printing couple is moving through the printing zone;
T1the time taken for the printing cylinder of a print couple to travel through the printing zone;
V2the speed at which the printing cylinder of the print couple is rotated past the sheet in the non-printing zone;
T2the time taken for the printing cylinder of the printing couple to travel across the sheets in the non-printing zone;
and S2 x the single impression set repeats the print pattern web length.
8. The intermittent forward skipping control method according to claim 7, wherein the printing patterns mounted on the printing cylinders of the two printing groups are printing plates with the same pattern or printing plates with different patterns.
9. The intermittent forward skip control method according to claim 7 or 8, wherein said V2And V1Equal to, or, said V2And V1Not equal.
10. A jump traction device, comprising:
the paper feeding skip step traction machine and the paper outlet skip step traction machine are arranged on the frame and synchronously run, and the paper feeding skip step traction machine and the paper outlet skip step traction machine control paper to be respectively V-shaped through the control unit1Velocity sum V2Alternately advancing at speed, with the paper sheet V1The speed is changed from the first set position to the second set position and then V2The speed is changed from the second set position to the third set position, and the paper is fed at V1Time taken for speed to travel T1For working time, the paper is represented by V2Time taken for speed to travel T2For fast feed time, the center-to-center distance L between the two sets of printing couples is equal to: repeatedly printing odd times of the length of the pattern by a single printing group;
paper feed length S ═ V in each cycle1×T1+V2×T2(ii) a In the formula:
V1the speed at which the printing cylinder of the printing couple is moving through the printing zone;
T1the time taken for the printing cylinder of a print couple to travel through the printing zone;
V2the speed at which the printing cylinder of the print couple is rotated past the sheet in the non-printing zone;
T2the time taken for the printing cylinder of the printing couple to travel across the sheets in the non-printing zone;
and the driving motors in the paper feeding skip-step traction machine and the paper discharging skip-step traction machine receive the control signals to drive the paper feeding actuating mechanism, so that the repeated printing pattern width length of the single printing group is realized, wherein S is 2.
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| CN110385748A (en) * | 2019-07-24 | 2019-10-29 | 苏州安洁科技股份有限公司 | A kind of cross cutting waste discharge technique |
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2015
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