JP2012187791A - Duplex printing method using line inkjet head, duplex printing apparatus and bookbinding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a duplex printing method that prevents the lowering of throughput caused by flushing and accurately performs the alignment of duplex printing.SOLUTION: In the duplex printing method for performing printing on both sides of recording paper 4 using a print head configured of a line inkjet head, the flushing is carried out on a part continuing to a rear end of a printed part of front-face print data to from a flushing mark C for alignment in a front-face printing step of printing the front-face print data to a front face 4c of the recording paper 4. In a rear-face printing step of printing rear-face print data to a rear face 4d of the recording paper 4, a rear-face print position is determined based on a position of the flushing mark C. Furthermore, in a cutting step after duplex printing, a cutting position of recording paper 40 after the duplex printing is determined based on the position of the flushing mark C.

Description

  The present invention relates to a duplex printing method for performing duplex printing on continuous paper using a line-type inkjet head, a duplex printing apparatus for performing printing by the duplex printing method, and a duplex printing page for bookbinding using the duplex printing method. The present invention relates to a bookbinding method.

  2. Description of the Related Art As a double-sided printing apparatus that performs double-sided printing on continuous paper using a line-type inkjet head, there is known a printer that includes a line-type inkjet head for front surface printing and a line-type inkjet head for backside printing of continuous paper. In the double-sided printing apparatus having this configuration, the continuous paper is slackened between the two inkjet heads so that the difference in printing speed between the front and back due to the print data amount, print data length, etc. of the continuous paper can be absorbed. It is transported in the state.

  When the slack amount fluctuates, in order to accurately align the front surface printing position and the back surface printing position, the registration marks attached to the surface of the continuous paper at regular intervals are read, and based on this, the back side printing is performed. The position is decided. In the double-sided printing system described in Patent Document 1, a registration mark is printed using a line-type inkjet head that performs printing on the surface of continuous paper, and the registration mark is read during back-side printing, whereby the back-side printing position and front-side printing are performed. The position is adjusted.

JP 2010-131868 A

  Here, since the line-type inkjet head performs printing for one line at the same time, the printing speed is faster than when a serial-type inkjet head that performs printing while reciprocating in the width direction of continuous paper is used. However, the line-type inkjet head has a position on the extension line of the moving path for printing as in the case of the serial type when performing flushing in which ink droplets are wasted from each nozzle to prevent nozzle clogging. Unlike in the case of performing flushing, it takes time to move from the printing position to the flushing position and from the flushing position to the printing position. For this reason, regular flushing is a major factor in reducing the printing throughput.

  In double-sided printing using a line-type inkjet head, as described in Patent Document 1, it is desirable to print registration marks for alignment in order to accurately align the front and back printing positions. However, printing a registration mark that is not necessary for original printing reduces the printing throughput and increases the ink consumption.

  In view of these points, an object of the present invention is to provide a double-sided printing method and a double-sided printing apparatus using a line-type inkjet head capable of suppressing a decrease in throughput due to flushing and accurately performing double-sided printing alignment. Is to propose.

  Another object of the present invention is to propose a bookbinding method capable of efficiently creating a double-sided printed page for bookbinding using such a new double-sided printing method.

In order to solve the above problems, the present invention provides a double-sided printing method for performing double-sided printing on continuous paper using a line-type inkjet head.
A first side printing step of printing first side printing data on the first side of the continuous paper;
A second surface printing step of printing second surface print data on a portion corresponding to a print portion of the first surface print data on the second surface of the continuous paper;
A cutting step of cutting the continuous paper in the width direction,
In the first side printing step, in order to prevent nozzle clogging, a portion of the first side of the continuous paper that is continuous with at least one of the leading end and the trailing end of the printed portion of the first side printing data is provided. Flushing is performed to eject ink droplets from all nozzles of the line-type inkjet head to form a line-shaped first surface flushing mark extending in the width direction of the continuous paper,
In the second surface printing step, based on the position of the first surface flushing mark, the print position of the second surface print data is determined,
In the cutting step, the cutting position of the continuous paper is determined based on the position of the first surface flushing mark.

  Here, it is possible to perform flushing on the second surface even during the second surface printing. In this case, the flushing may be performed on the portion on the second surface (the back surface of the mark forming portion) corresponding to the mark forming portion where the first surface flushing mark is formed. That is, in the second surface printing step, the flushing is performed on the portion on the second surface corresponding to the mark forming portion where the first surface flushing mark is formed on the continuous paper, and the line-shaped first A two-side flushing mark may be formed.

  In the present invention, when performing double-sided printing such as a double-sided printed page for bookbinding, print data for a plurality of pages is prepared as the first side print data and the second print data, respectively. In this case, in the first side printing step, on the first side of the continuous paper, the front side portion of the print start position of the first side print data, the predetermined number of pages of the first side print data. The mark forming portions having a predetermined length are secured in the rear portion of the printing end position and the rear portion of the first surface print data printing end position, and the flushing is performed on these mark forming portions. You just have to do it.

  Next, since the mark forming portion is an unnecessary portion, in the cutting step, the first side print data and the second side print data on the continuous paper are printed from the first side print portion after the first side print data and the second side print data are printed. What is necessary is just to cut | disconnect the mark formation part in which the surface flushing mark is formed (the mark formation part in which the 1st surface flushing mark and the 2nd surface flushing mark are formed when flushing also on the 2nd surface).

  Here, double-sided printing can be performed using a single line-type inkjet head. To this end, in the first side printing step, the continuous paper is transported from the leading end side via the printing position of the line-type inkjet head, and the first side printing data and the first side are transferred to the first side. The first side flushing mark is printed, and the continuous paper is cut at a position after the printing on the first side is finished. In the second side printing step, a continuous paper piece having a predetermined length after the cutting is set on the rear end side. The second surface print data and the second surface flushing mark may be printed on the second surface by being conveyed via the printing position of the line type ink jet head.

  Instead of using a single line-type inkjet head, a first line-type inkjet head that prints on the first surface of the continuous paper and a second line-type inkjet head that prints on the second surface of the continuous paper Can also be used.

Next, the present invention is a double-sided printing apparatus for performing double-sided printing on continuous paper by the above double-sided printing method,
A line-type inkjet head;
A transport mechanism for transporting continuous paper along a transport path passing through the printing position of the line-type inkjet head;
A first cutting mechanism for cutting the continuous paper at a position downstream of the printing position in the transport path in the transport direction;
A mark detector for detecting the first surface flushing mark printed on the first surface of the continuous paper at a position upstream of the print position in the transport path in the transport direction;
A drive control unit configured to drive and control the line-type inkjet head, the transport mechanism, and the first cutting mechanism to execute the first surface printing step, the second surface printing step, and the cutting step; It is characterized by.

  Here, when performing double-sided printing using a single line-type inkjet head, a second cutting mechanism that cuts the continuous paper at a position upstream of the print position in the transport path in the transport direction is disposed. In addition, in the first surface printing process, the drive control unit conveys the continuous paper from the leading end side via the printing position of the line-type inkjet head, and moves the first surface to the first surface. In addition to printing the surface print data and the first surface flushing mark, the second cutting mechanism causes the continuous paper to be cut at a position after the printing of the first surface. In the second surface printing step, A continuous sheet piece of a predetermined length is conveyed from the rear end side via the printing position of the line-type inkjet head, and the second side print data and the second side print data are transferred to the second side. It may be so as to print the second side flashing mark.

  Next, the above double-sided printing method according to the present invention is suitable for use in creating a double-sided printed page for bookbinding.

  In this case, if the mark forming portion with the flushing mark is sandwiched between the binding margin portions for bookbinding, it is not necessary to cut out the mark forming portion, so that the step of cutting the mark forming portion can be omitted.

  Further, even if the mark forming part is located at the saddle stitching part, the step of cutting the mark forming part can be omitted. That is, as first side print data and second side print data, print data for preparing a double-sided printed page for saddle-stitched book production is prepared, and in the first side printing step, the mark forming portion is the saddle-stitched book. The mark forming part may be formed so as to be positioned at the saddle stitching part.

  Further, before the cutting step or after the cutting step is finished, bookbinding glue may be applied (applied or discharged) to the mark forming portion.

  In the double-sided printing method and double-sided printing apparatus of the present invention, a flushing mark formed on the first side of continuous paper by flushing a line-type inkjet head is used as a registration mark for determining the printing position of the second-side print data. . In addition, the first side flushing mark formed by the flushing is used as a reference for determining the second side print data positioning mark with respect to the print position of the first side print data and the cutting position of the continuous paper after duplex printing. We are using.

  Therefore, it is not necessary to move the line-type inkjet head to a dedicated location such as a maintenance unit for flushing, and accordingly, the printing throughput can be increased accordingly. In addition, since the mark formed by flushing is used for positioning in double-sided printing, there is no need to separately print the positioning mark, and the printing throughput can be increased correspondingly, and the amount of ink consumed unnecessarily. Can also be reduced. As a result, there is an advantage that the capacity of the waste ink tank for collecting the waste ink discharged by the flushing can be reduced. Furthermore, based on the flushing mark, the portion of continuous paper after double-sided printing can be cut at an accurate position, and in particular, the double-sided printed portion and the mark forming portion are cut at an accurate position to cut out the mark forming portion. Can do.

  Next, according to the bookbinding method of the present invention, double-sided printed pages can be efficiently created using continuous paper, and double-sided printed pages of various sizes can be created using continuous paper of the same width. It is. Further, if printing is performed so that the mark forming portion with the flushing mark becomes a binding margin portion, the step of cutting the mark forming portion can be omitted, so that bookbinding can be performed more efficiently. Therefore, the double-sided printing method and bookbinding method using the double-sided printing apparatus of the present invention are suitable for use as an on-demand bookbinding machine in electronic publishing.

It is a schematic block diagram which shows the double-sided printing apparatus to which this invention is applied. It is explanatory drawing which shows the surface printing process of a duplex printing apparatus. It is explanatory drawing which shows the 1st cutting operation and winding-up operation | movement of a duplex printing apparatus. It is explanatory drawing which shows the back surface printing process of a duplex printing apparatus. It is explanatory drawing which shows the example of creation of a double-sided printing page. It is explanatory drawing which shows the creation example of the double-sided printing page for bookbinding. It is explanatory drawing which shows the creation example of the double-sided printing page for bookbinding.

  Embodiments of a duplex printing apparatus to which the present invention is applied will be described below with reference to the drawings. The double-sided printing apparatus according to this embodiment is suitable for use, for example, for creating a double-sided printed page for bookbinding using continuous paper. However, the present invention is not limited to a double-sided printed page for bookbinding. Of course, it can be used to perform duplex printing.

(overall structure)
FIG. 1 is a schematic configuration diagram showing a double-sided printing apparatus according to the present embodiment. The double-sided printing apparatus 1 includes a roll paper storage unit 3 formed inside an apparatus case 2, in which a roll paper 5 having a configuration in which a recording paper 4 that is a continuous paper is wound is stored. The recording paper 4 fed out from the roll paper 5 in the roll paper storage unit 3 is guided along the first paper feed path 6 toward the recording paper discharge port 7 formed in the apparatus case 2. The first paper feed path 6 is a path defined by a plurality of paper guides (not shown), and is indicated by a thick solid line in FIG. The first paper feed path 6 has an upstream paper feed roller pair 8 and a second cutter 9 (second cutting mechanism) from the upstream roll paper storage unit 3 toward the downstream recording paper discharge port 7. ), A downstream paper feed roller pair 10, a print head 11, a paper discharge roller 12, and a first cutter 13 (first cutting mechanism) are disposed. A paper discharge support roller pair 31 is disposed on the downstream side of the first cutter 13.

  The print head 11 is a line-type inkjet head including a nozzle row having a length extending over the entire width in the width direction of the first paper feed path 6. When performing color printing, nozzle rows of each color for ejecting ink droplets of each color are formed on the nozzle surface of the line-type inkjet head. Or it is set as the structure provided with the line-type inkjet head of each color provided with the nozzle row which discharges the ink droplet of each color. The line type ink jet head of the present invention is used in the meaning including any of these cases.

  A branch point 14 from the first paper feed path 6 is formed between the print head 11 and the first cutter 13. A conveyance direction switching claw 15 is disposed at the branch point 14. When the conveyance direction switching claw 15 is located at the first position 15A indicated by the solid line in FIG. 1, the recording paper 4 that has passed the printing position 11A of the print head 11 is the first guide surface 15a of the conveyance direction switching claw 15. Along the first paper feed path 6 and guided toward the recording paper discharge port 7. When the transport direction switching claw 15 is switched to the second position 15B indicated by the imaginary line in FIG. 1, the leading edge of the recording paper 4 after passing through the printing position 11A extends along the paper discharge roller 12 to the transport direction switching claw 15. The second guide surface 15b is branched from the branch point 14 to the paper collection path 16 side.

  The paper collection path 16 is indicated by a thick broken line in FIG. 1 and is a path from the branch point 14 to the take-up / feed-out unit 17. The winding / feeding-out portion 17 includes a winding core 18 having a circular outer peripheral surface 18a. The winding core 18 is supported by a pair of guide rollers 19a and 19b from the lower side in a rollable state. . A winding / feeding roller 20 is pressed against the circular outer peripheral surface 18a of the winding core 18 with a predetermined urging force. The recording paper 4 guided to the paper collecting path 16 and reaching the take-up / feeding unit 17 is rotated by the take-up / feeding roller 20 in the counterclockwise direction CCW. It is wound around the circular outer peripheral surface 18a.

  Here, on the outer peripheral side of the take-up core 18, the take-up recording paper 4 is pulled out from the rear end side at a position away from the take-up / feeding roller 20 in the clockwise direction CW by a predetermined angle. Guide claws 21 are arranged. The distal end surface of the guide claw 21 is a curved guide surface 21a. The curved guide surface 21a faces the winding / feeding roller 20 side, and one end 21b of the curved guide surface 21a is biased toward the circular outer peripheral surface 18a side of the winding core 18 by a predetermined biasing force. Has been. Further, a roller contact surface 21c extending in a direction away from the take-up / feeding roller 20 is formed substantially along the tangential direction of the circular outer peripheral surface 18a, continuously from the end 21b of the curved guide surface 21a.

  By rotating the take-up core 18 in the clockwise direction CW by the take-up / feeding roller 20, the recording paper 4 wound around the take-up core 18 can be pulled out from the rear end. That is, the trailing end of the recording paper 4 in the winding state is scooped up by the guide claw 21, and can be pulled out along the curved guide surface 21a while being bent in the direction opposite to the bending direction at the time of winding.

  The recording paper 4 drawn out by the guide claw 21 is guided by the second paper feed path 22 indicated by a thick one-dot chain line in FIG. 1 and joins the first paper feed path 6 at the junction 23. The junction 23 is located between the cutting position by the second cutter 9 in the first paper feed path 6 and the nip portion of the downstream paper feed roller pair 10. Further, a mark detector 24 for reading the first surface flushing mark printed on the surface of the recording paper 4 is provided at a portion between the junction 23 in the first paper feed path 6 and the printing position by the print head 11. Is arranged.

  Here, the paper feed mechanism that transports the recording paper 4 along the first paper feed path 6 includes an upstream paper feed roller pair 8, a downstream paper feed roller pair 10, a paper discharge support roller pair 31, and these. The paper feed motors 25 and 26 for driving, a paper discharge motor 32, and the like are included. Both roller pairs 8, 10 may be driven by a single paper feed motor. The paper feed mechanism that transports the recording paper 4 along the paper collection path 16 includes a downstream paper feed roller pair 10, a take-up / feed-out roller 20, a feed-out motor 27 that rotationally drives the take-up / feed-out roller 20, and the like. Is done. The paper feed mechanism that transports the recording paper 4 along the second paper feed path 22 includes a take-up / feed roller 20, a motor 27, and the like.

  The double-sided printing apparatus 1 includes a drive control unit 28 configured mainly with a microcomputer including a CPU, a ROM, a RAM, and the like. The drive control unit 28 executes a control program stored in the ROM based on a command from the host device 29 or based on an input command from the operation unit 30, so that the print head 11 and the paper having the above-described configuration are executed. The feeding mechanism, the conveyance direction switching claw 15, the first and second cutters 13 and 9 are driven and controlled to perform the printing operation, the cutting operation, and the like of the recording paper 4.

(Printing operation)
2 and 3 are operation explanatory views showing the first surface printing process of the recording paper 4 by the double-sided printing apparatus 1. The first surface printing process, that is, the printing process on the surface of the recording paper 4 includes a first paper feeding operation, a surface printing operation, a winding operation, and a first cutting operation.

  First, with reference to FIG. 2, the roll paper 5 stored in the roll paper storage unit 3 is configured so that the leading edge 4 a of the recording paper 4 drawn from the roll paper 5 is on the upstream paper feed path 6 on the first paper feed path 6. It is set in a predetermined state located downstream of the roller pair 8. From this state, the first paper feed operation for transporting the recording paper 4 along the first paper feed path 6 is started. In the first paper feeding operation, the transport direction switching claw 15 is switched to the second position 15B. The recording paper 4 conveyed along the first paper feeding path 6 by the upstream paper feeding roller pair 8 and the downstream paper feeding roller pair 10 has a surface 4c (first surface) facing the print head 11 side. The surface 4c is subjected to predetermined printing by the print head 11 (surface printing operation).

  The leading edge 4 a of the recording paper 4 after passing through the printing position is guided from the first paper feed path 6 to the paper collection path 16 by the conveyance direction switching claw 15. The leading edge 4 a of the recording paper 4 guided to the paper collection path 16 is sent along the paper collection path 16 to the winding / feeding-out unit 17. The take-up core 18 of the take-up / feed-out unit 17 is rotated by the take-up / feed-out roller 20 in the counterclockwise direction CCW which is the recording paper take-up direction. Therefore, the leading edge 4a of the recording paper 4 that has reached the portion of the circular outer peripheral surface 18a that is in contact with the guide roller 19a in the winding core 18 is fed through between the circular outer peripheral surface 18a and the guide roller 19a, and the circular shape. It is gradually wound around the outer peripheral surface 18a. In this example, in such a winding operation, the recording paper 4 is wound with the surface 4c facing outward.

  Next, the first cutting operation of the recording paper 4 will be described with reference to FIG. When the length of the recording paper 4 fed out from the roll paper 5 reaches a predetermined length, the upstream second cutter 9 is driven, and the recording paper 4 is cut in the width direction. At the time of cutting, the paper feeding operation, the front surface printing operation, and the winding operation are temporarily stopped, and the recording paper 4 is cut in a state where conveyance of the recording paper is stopped. After the recording paper 4 is cut, the upstream paper feed roller pair 8 is held in a stopped state, the downstream paper feed roller pair 10 and the take-up / feeding roller 20 start to rotate again, and the second cutter 9 A paper feeding operation for transporting the recording paper 4A located on the downstream side of the recording paper, a surface printing operation for printing on the surface thereof, and a winding operation for winding on the winding core 18 are performed.

  The winding operation is performed until the trailing end 4b of the cut recording paper 4A is wound around the winding core 18. As a result, as shown in FIG. 3B, the recording paper 4A having a predetermined length after being cut is wound around the winding core 18 in multiple layers. Note that it is desirable to stop the winding operation in a state where the rear end 4b of the recording paper 4A is positioned between the guide claw 21 and the winding / feeding roller 20.

  FIG. 4 is an operation explanatory view showing a second side printing step, that is, a back side printing step performed after the winding operation. The second side printing step includes a second paper feeding operation and a back side printing operation. The second surface printing step can be performed subsequent to the winding operation described above, but can also be performed after a predetermined time has elapsed.

  In the second paper feeding operation, the conveyance direction switching claw 15 is returned to the first position 15A, and in this state, the take-up core 18 is driven to rotate in the clockwise direction CW by the take-up / feeding roller 20. When the rear end 4b of the recording paper 4A wound around the circular outer peripheral surface 18a of the take-up core 18 hits the end of the curved guide surface 21a of the guide claw 21, the curved guide surface 21a scoops it outward and the curved guide It is guided to the second paper feed path 22 along the surface 21a.

  Here, the recording paper 4A is guided by the curved guide surface 21a while being forced to bend in the direction opposite to the curving direction in the wound state. Thereby, the curl attached to the recording paper 4A can be removed or alleviated. As a result, it is possible to avoid or suppress the occurrence of adverse effects such as a paper jam caused by conveying the recording paper 4A with curl.

  Next, the rear end 4b of the recording paper 4A conveyed along the second paper feeding path 22 enters the first paper feeding path 6 at the junction 23, and from here the printing position 11A by the downstream paper feeding roller pair 10. It is conveyed toward. The recording paper 4A is conveyed so that the back surface 4d faces the print head 11 side. Therefore, in the second paper feeding operation, a back surface printing operation is performed in which printing is performed by the print head 11 on the back surface 4d of the recording paper 4A. As will be described later, in the back surface printing operation, the first detector flushing mark printed on the front surface 4c of the recording paper 4A is detected by the mark detector 24 prior to printing, and based on this, the back surface print data is detected. The print position is positioned with respect to the print position of the front surface print data.

  Next to the back side printing step, which is the second side printing step, a cutting step is executed to cut the recording paper 4A in the duplex printing state. That is, the recording paper 4 </ b> A after the back side printing is guided to the first cutter 13 side by the conveyance direction switching claw 15. In the back side printing operation, for example, predetermined information is printed for each fixed length. When the boundary position of the print information is conveyed to the cutting position of the first cutter 13, the conveyance of the recording paper 4 </ b> A is stopped, and the recording paper 4 </ b> A is cut by the first cutter 13. By repeatedly performing the back side printing operation and the cutting operation, a recording paper piece of a certain length subjected to double-sided printing is repeatedly issued from the recording paper discharge port 7.

(Example of creating a double-sided page)
Next, a printing operation for creating a double-sided printing page for bookbinding using the double-sided printing apparatus 1 having the above configuration will be described.

  FIG. 5A is an explanatory diagram showing a print example of a double-sided print page for 8 pages. The recording paper 40 in which the double-sided printing pages for 8 pages shown in this figure are continuous corresponds to the above-mentioned recording paper 4A after completion of double-sided printing before being cut by the first cutter 13. Print data of each even page (2, 4, 6, 8) is prepared as front side print data that is the first side print data, and each odd page (1, 3, 6, is provided as back side print data that is the second side print data. (5th and 7th pages) of print data is prepared.

  When a print command including print data for such a double-sided printing page is received from the host device 29 or the like, the drive control unit 28 of the double-sided printing apparatus 1, as described above, the surface 4c (first surface) of the recording paper 4 The front surface printing process for printing the front surface printing data on the back surface 4d is performed, and then the back surface printing process for printing the back surface printing data on the back surface 4d (second surface) of the recording paper 4 is performed. Each odd page is printed in a portion corresponding to each even page. Next, a cutting process for cutting the printed recording paper 40 in the width direction by the first cutter 13 is executed to separate the double-sided printed pages 41, 42, 43, 44.

  More specifically, as shown in FIG. 5B, in the front surface printing step, a predetermined length from the front side of the print start position of the front surface print data, that is, the front end 4a of the recording paper 4, on the surface of the recording paper 4. A mark forming portion 45 is secured, and the flushing of the print head 11 is performed at a substantially central position in the recording paper length direction in the mark forming portion 45, and a line-shaped flashing mark A is attached. Further, a flushing mark is attached every time printing is completed for the predetermined number of pages in the front surface print data. In this example, since only four pages are printed on the front surface, a mark forming portion 46 having the same length is secured in the rear portion of the position where printing of the third page is finished, and flushing mark B is performed by performing flushing here. wear. Further, a mark forming portion 47 of the same length is secured in the rear portion of the print end position of the front surface print data, in this example, the rear portion of the eighth page print position of the fourth page. Mark C. The rear end D (4b) of the mark forming portion 47 is cut by the second cutter 9, and the recording paper 40 having a predetermined length is cut off from the recording paper 4.

  As shown in FIG. 5C, in the back surface printing step, the recording paper 40 having a fixed length that has been cut after the front surface printing is conveyed with the trailing edge D (4b) as the head, and the back surface of the recording paper 40 The back side print data is printed on. Prior to printing the first seven pages, a mark forming portion having a certain length is secured from the rear end D corresponding to the mark forming portion 47 on the front surface side, and a flushing mark E is attached by performing flushing. That is, the flushing mark E is attached to the back surface of the mark forming portion 47. Subsequent print start positions of the seventh page are determined based on the conveyance amount of the recording paper 40 from the time point of detection by detecting the flushing mark C on the front side by the mark detector 24. Thereby, the edge of the 8th page on the front side (printing end position) and the edge of the 7th page on the back side (printing start position) can be accurately matched. Further, it is possible to accurately match the printing positions of subsequent 5, 3, and 1 pages with the corresponding printing positions of 6, 4, and 2 pages on the corresponding front side.

  In backside printing, flushing marks F and G are applied to the backside of the mark forming portions 46 and 45 other than the mark forming portion 47 on the front side, respectively. In this way, in front side printing and back side printing, flushing is performed at the start of printing, at the end of printing, and after a predetermined amount of printing has been performed, so that nozzle clogging of the print head 11 composed of a line-type inkjet head is reliably ensured. Can be prevented. Further, since the operation of retracting the print head 11 to a maintenance position (not shown) for flushing is unnecessary, it is possible to prevent a decrease in printing throughput. In addition, since the front and back printing positions are positioned using the flushing marks formed by flushing, there is no need to print dedicated resist marks, which can improve printing throughput and reduce ink consumption. Waste can be suppressed.

  Next, also in the cutting step, the cutting operation by the first cutter 13 is controlled based on the detection result of the flushing mark C printed on the surface. That is, since the distance from the detection position by the mark detector 24 to the printing position 11A of the print head 11 and the distance from the printing position 11A to the cutting position of the first cutter 13 are known, the flushing mark C by the mark detector 24 is known. Each double-sided printed page 41 to 44 can be accurately cut at the cutting positions H to M, respectively, as shown in FIG.

(Double-sided printed page binding example 1)
In creation example 1 described above, the mark forming portions 45 to 47 are cut and separated from the double-sided printed pages 41 to 44 and discarded. However, in the case of bookbinding by saddle stitching, if any or all of the mark forming portions 45 to 47 are sandwiched so as to fit within the binding margin portion, the cutting process of the mark forming portions 45 to 47 can be omitted.

  For example, in the case of creation example 1 shown in FIG. 5 described above, as shown in FIG. 6A, the mark forming portion 46 remains attached to the double-sided printing page 43 on which pages 6 and 5 are printed. . Then, the mark forming portion 46 may be folded so as to fit in the binding margin portion. For example, as shown in FIG. 6 (b), the mark forming portion 46 may be folded to the 5th page and bound so as to be sandwiched between the 5th and 4th pages. If the mark forming portions 45 to 47 are formed so as to be positioned on the same side of the double-sided printed pages 41 to 44, the mark forming portions 45 to 47 may be sandwiched between the binding margin portions so that they cannot be seen. Therefore, the number of times of cutting the recording paper can be greatly reduced, and the efficiency of the duplex printing operation or the bookbinding duplex printing page creation operation can be improved.

(Double-sided printed page binding example 2)
Next, FIG. 7 is an explanatory diagram illustrating an example in which a double-sided printing page for saddle stitching is created using the double-sided printing apparatus 1. For example, in the case of a double-sided print page for 8 pages, as shown in FIG. 7A, data to be printed in order of pages 4, 5, 2, and 7 is prepared as front side print data, Prepare data to be printed in the order of pages 3, 6, 1, 8 and perform mark forming portions 51 to 54 for flushing, a portion before the print start position on each of the front and back sides, a portion after the print end position, And it arrange | positions between 4 pages and 5 pages which adjoin, and between 2 pages and 7 pages. In this case, the recording paper 60 after double-sided printing is cut at three cut positions 55 to 57 shown in FIG. As a result, two double-sided printed pages 58 and 59 are obtained. As a result, as shown in FIG. 7B, by binding these double-sided printed pages 58 and 59 in the saddle stitching state, the mark forming portions 52 and 53 are positioned in the saddle stitching portion.

  In each of the above examples, it is convenient to apply or discharge the binding glue to the mark forming portion of the recording paper that has been flushed, so that no glueing operation is required at the time of binding. For example, a glue application mechanism capable of discharging or extruding glue from an application roller and a nozzle may be built in or externally attached to the duplex printing apparatus 1.

(Other embodiments)
Each of the above examples is for creating a double-sided printing page for bookbinding, but it goes without saying that the present invention can be used for printing double-sided printing data other than a double-sided printing page for bookbinding.

  In the double-sided printing apparatus 1 described above, printing is performed on the front and back surfaces of the recording paper using the print head 11 composed of a line-type inkjet head, and the print head composed of a line-type inkjet head for surface printing; Of course, it is also possible to use a double-sided printing apparatus having a configuration including a printing head composed of a line-type inkjet head for backside printing.

DESCRIPTION OF SYMBOLS 1 ... Double-sided printing apparatus, 2 ... Device case, 3 ... Roll paper storage part, 4 ... Recording paper, 4A ... Recording paper of predetermined length, 4a ... Front end, 4b ... Rear end, 4c ... Front surface, 4d ... Back surface, 5 ... roll paper, 6 ... first paper feed path, 7 ... recording paper discharge port, 8 ... upstream paper feed roller pair, 9 ... second cutter, 10 ... downstream paper feed roller pair, 11 ... print head, 11A ... Printing position, 12 ... paper discharge roller, 13 ... first cutter, 14 ... branch point, 15 ... transport direction switching claw, 15A ... first position, 15B ... second position, 15a ... first guide surface, 15b ... second Guide surface, 16 ... paper collection path, 17 ... winding / feeding portion, 18 ... winding core, 18a ... circular outer peripheral surface, 18b ... recessed portion, 19a, 19b ... guide roller, 20 ... winding / feeding roller, 21 ... Guide claw, 21a ... curved guide surface, 21b ... end 21c ... Roller contact surface, 22 ... Second paper feed path, 23 ... Merging point, 24 ... Mark detector, 25, 26 Paper feed motor, 27 Feed motor, 28 Drive control unit, 29 Host device, 30 Operation unit, 31: Paper discharge support roller pair, 32: Paper discharge motor, 40: Recording paper, 41-44 ... Double-sided printing pages, 45-47, 45a-47a ... Mark formation part, 51-54 ... Mark formation part, 55-57 ... Cut position, 58, 59 ... Double-sided printing page, A to C, E to G ... Flushing mark, D ... Rear end, H to M ... Cutting position

Claims (13)

In a double-sided printing method for performing double-sided printing on continuous paper using a line-type inkjet head,
A first side printing step of printing first side printing data on the first side of the continuous paper;
A second surface printing step of printing second surface print data on a portion corresponding to a print portion of the first surface print data on the second surface of the continuous paper;
A cutting step of cutting the continuous paper in the width direction,
In the first side printing step, in order to prevent nozzle clogging, a portion of the first side of the continuous paper that is continuous with at least one of the leading end and the trailing end of the printed portion of the first side printing data is provided. Flushing is performed to eject ink droplets from the nozzles of the line-type inkjet head to form a line-shaped first surface flushing mark extending in the width direction of the continuous paper,
In the second surface printing step, based on the position of the first surface flushing mark, the print position of the second surface print data is determined,
In the cutting step, a double-sided printing method using a line-type inkjet head, wherein the cutting position of the continuous paper is determined based on the position of the first surface flushing mark. In claim 1,
In the second surface printing step, the flushing is performed on a portion on the second surface corresponding to the mark forming portion where the first surface flushing mark is formed on the continuous paper, and the second surface in a line shape A double-sided printing method using a line-type inkjet head, characterized by forming a flushing mark. In claim 1 or 2,
Each of the first side print data and the second print data is print data for a plurality of pages,
In the first side printing step, on the first side of the continuous sheet, the front side portion of the print start position of the first side print data, and the print end position corresponding to a predetermined number of pages of the first side print data. The mark forming portions having a predetermined length are secured in the rear portion and the rear portion of the printing end position of the first surface print data, and the flushing is performed on these mark forming portions. A double-sided printing method using a line-type inkjet head. In any one of claims 1 to 3,
In the cutting step, the mark forming portion where the first surface flushing mark is formed is cut from the double-sided printed portion of the continuous paper after the first-side printing data and the second-side printing data are printed. A double-sided printing method using a line-type inkjet head characterized by the above. In any one of claims 1 to 4,
The double-sided printing method using a line-type inkjet head, wherein the first side print data and the second side print data are data for printing a double-sided print page for bookbinding. In any one of claims 1 to 5,
In the first side printing step, the continuous paper is transported from the leading end side via the printing position of the line type inkjet head, and the first side printing data and the first side flushing mark are placed on the first side. Printing and cutting the continuous paper at a position after the printing on the first side;
In the second surface printing step, a continuous sheet piece of a predetermined length after cutting is conveyed from the rear end side via the printing position of the line-type inkjet head, and the second surface printing is performed on the second surface. A double-sided printing method using a line-type inkjet head, wherein the data and the second surface flushing mark are printed. In any one of claims 1 to 5,
As the line-type inkjet head, a first line-type inkjet head that performs printing on the first surface of the continuous paper and a second line-type inkjet head that performs printing on the second surface of the continuous paper are used. A double-sided printing method using a characteristic line-type inkjet head. A double-sided printing apparatus for performing double-sided printing on continuous paper by the double-sided printing method according to any one of claims 1 to 5,
A line-type inkjet head;
A transport mechanism for transporting continuous paper along a transport path passing through the printing position of the line-type inkjet head;
A first cutting mechanism for cutting the continuous paper at a position downstream of the printing position in the transport path in the transport direction;
A mark detector for detecting the first surface flushing mark printed on the first surface of the continuous paper at a position upstream of the print position in the transport path in the transport direction;
A drive control unit configured to drive and control the line-type inkjet head, the transport mechanism, and the first cutting mechanism to execute the first surface printing step, the second surface printing step, and the cutting step; A double-sided printing device. In claim 8,
A second cutting mechanism that cuts the continuous paper at a position upstream of the print position in the transport path in the transport direction;
In the first surface printing step, the drive control unit conveys the continuous paper from the leading end side through the printing position of the line-type inkjet head, and the first surface print data and the first surface are transferred to the first surface. The first surface flushing mark is printed, and the continuous sheet is cut at a position after the first surface is printed by the second cutting mechanism. In the second surface printing step, a predetermined length after the cutting is obtained. A continuous sheet piece is conveyed from the rear end side via the printing position of the line-type inkjet head, and the second surface print data and the second surface flushing mark are printed on the second surface. Double-sided printing device.   A bookbinding method, wherein a double-sided printing page is created by performing double-sided printing on continuous paper using the double-sided printing method according to any one of claims 1 to 7. In claim 10,
In the cutting step, the double-sided printed portion of the continuous paper is cut for each page, and a page in which the mark forming portion continues to the front end or the rear end is cut with the mark forming portion attached. And
Of each double-sided printed page obtained after cutting, each double-sided printing is performed so that the mark-formed part is folded and the folded part is sandwiched between the binding margin parts. A bookbinding method comprising binding pages in a predetermined order to make a book. In claim 10,
As the first side print data and the second side print data, prepare print data from which the double-sided print page of the saddle stitch bookbinding operation is obtained,
In the first surface printing step, the book mark forming part is formed such that the mark forming part is positioned in the saddle stitch part of the saddle stitch book. In claim 11 or 12,
A bookbinding method comprising a glue applying step of applying a bookbinding glue to the mark forming portion before or after the cutting step.

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