JP2015006756A - Stencil printing device and printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printing device in which print sheets whose both faces are already printed are loaded in the manuscript's page order when the high-speed two-sided printing is performed for the manuscript with a plurality of pages in a double-speed printing mode by using a master with a plurality of images made up by plate-making.SOLUTION: A stencil printing device includes a plate-making part, a control part which controls the plate-making order and plate-making position of a plate-making image, a print part which has a plate cylinder 3 around which a master 1 is wound and a pressing member 5, a sheet feeding part, a discharged sheet conveyance part, and a sheet discharge table. The stencil printing device performs plate-making of masters for at least two plates, places a print sheet 4 whose one face is already printed on the sheet feeding part by reversing the front and back of the print sheet after printing the plate-making image of the first master on one face of the print sheet 4, feeds the print sheet to the print part again, prints the plate-making image of the second master on the other face, and loads the plurality of print sheets 4 whose both faces are already printed onto the sheet discharge table. The control part controls plate-making so that the loading order of the print sheets 4 whose both faces are already printed discharged to the sheet discharge table becomes the manuscript's page order.

Description

  The present invention relates to a stencil printing apparatus and a printing method.

  A master (stencil sheet) made based on the image data of the document is wound around the outer periphery of the cylindrical plate cylinder, and the printing sheets separated and fed one by one are pressed against the outer periphery of the plate cylinder. 2. Description of the Related Art A stencil printing apparatus that performs printing (image formation) by transferring ink that has passed through holes to printing paper is known (see, for example, Patent Documents 1 to 7).

  In a conventional stencil printing apparatus, printing is always performed once on one sheet of printing paper by one rotation of the plate cylinder, and one printed matter is formed. Since the printing speed is determined by the rotation speed of the plate cylinder, it is constant regardless of the size of the printing paper. On the other hand, an electrophotographic image forming apparatus generally has a higher copying speed as the printing paper size becomes smaller. In view of this, in the stencil printing apparatus, a method has been proposed in which the size of the printing paper is reduced and printing paper is continuously fed and printed per one rotation of the plate cylinder (see Patent Documents 2 to 6). Specifically, since A3 size printing is possible for the stencil sheet, two A4 size images are made side by side on a single stencil sheet, and two A4 size printing sheets are fed continuously. By doing so, it is possible to print on two sheets of paper with one rotation of the plate cylinder. By performing such double-speed printing (high-speed printing), for example, when the rotational speed of the plate cylinder is 120 rpm, the printing speed that was 120 sheets / minute in the past is 240 sheets / minute.

In addition, stencil printing apparatuses that perform double-sided printing have been proposed (see Patent Documents 5 to 7).
The printing speed twice as fast as the conventional one can also be realized by continuously printing the front surface image and the back surface image. For example, after the front image and the back image are arranged in the circumferential direction (conveying direction) on the stencil sheet wound around the outer periphery of the plate cylinder, the surface image is printed and formed on one side of the printing paper, and then the printing paper Has also been proposed which re-feeds and prints the back image on the opposite side using the same printing drum.

  In Patent Document 2, a stencil sheet in which two images of a first surface and a second surface are arranged in the transport direction based on image data is used, and the first image is printed on a printing paper fed from a first paper feeder. The first printing process for printing the image on the surface and the second printing process for printing the image on the second surface on the printing paper fed from the second paper feeder are each performed once during one rotation of the printing drum. A stencil printing apparatus having a high-speed printing mode is disclosed. In this apparatus, it is described that the occurrence of paper jam is reduced by providing a second paper feeding device.

  In Patent Document 3, a plurality of identical or different images are made on a single master plate, and a sheet feeding drive unit and a sheet feeding drive unit that are disposed in a plurality of sheet feeding units and drive each sheet feeding unit are controlled. Printing that has control means and performs continuous printing by separating and feeding sheets one by one alternately from a plurality of paper feeding units according to the size of the image to be made and the paper size of the paper feeding unit An apparatus is disclosed. This apparatus describes that high-speed printing can be performed efficiently and easily.

  In Patent Document 4, first and second plate-making images corresponding to two originals are made on a master for one plate, a first printed sheet on which the first plate-making image is printed, There is disclosed a stencil printing apparatus provided with means for guiding so that the second printed paper on which the plate-making image is printed is discharged to a different paper discharge tray. In this apparatus, it is described that the trouble of performing a sorting operation after the end of printing is eliminated by selectively discharging printed paper.

Patent Document 5 uses a divided pre-printed master in which two first and second pre-printed images are arranged, and prints an image on the surface of the first sheet P1 from the paper feeding unit during double-sided printing. After being guided to the auxiliary tray by the switching member, the second sheet P2 is fed to the printing unit, one image is printed on the front surface, and the sheet P1 is re-fed by the re-feeding unit and printed on the back surface. A one-step duplex printing apparatus is disclosed in which a sheet P1 is guided to a paper discharge unit and a sheet P2 is guided to an auxiliary tray by a switching member. According to this apparatus, it is possible to perform single-sided printing without using a useless master, obtain a printed matter with good image quality during double-sided printing, and further suppress an increase in installation space. Has been.
Patent Document 6 discloses an apparatus capable of one-step double-sided printing as in Patent Document 5, in which a refeed unit is a refeedable sheet that receives a refeed conveyance unit and one end of a surface printed sheet. A configuration having a backing plate is disclosed. According to this apparatus, it is possible to perform single-sided printing without using a useless master, obtain a printed matter with good image quality during double-sided printing, and further suppress the occurrence of paper conveyance jams. Have been described.

  In Patent Document 7, a first stencil cylinder in which a pre-made stencil sheet is mounted on the outer periphery and a rotation shaft is movably disposed, a second plate cylinder in which the rotation shaft is fixed, and a first plate cylinder are provided. Stencil printing, comprising: a detachment drive means for reciprocating movement so as to be detachably contacted with the two plate cylinders, and simultaneously printing on both sides by conveying the printing paper while being pressed and sandwiched between the first and second plate cylinders An apparatus is disclosed.

  Patent Document 1 does not disclose double-speed printing, but includes storage means for holding print data of a plurality of originals so that they can be read in an arbitrary order, and control means for controlling the plate-making means based on the bookbinding form. And a stencil printing apparatus that performs plate-making and printing corresponding to one side of a sheet, then flips and sets the paper in a predetermined direction, and performs plate-making and printing based on print data of a page corresponding to the other side. .

As described above, stencil printing apparatuses capable of high-speed printing, stencil printing apparatuses capable of duplex printing, and stencil printing apparatuses capable of high-speed printing and duplex printing are known.
However, in the stencil printing apparatus, printing is performed once for each stencil sheet that has been made, so that, for example, when a large amount of four pages of a document is printed on both sides by duplex printing, the first page on one side, The first double-sided printed paper with the second page printed on the other side, and the second double-sided printed paper with the third page printed on one side and the fourth page on the other side In general, printed sheets that are output separately and discharged are not stacked in the order of the pages of the document.
If the discharged print sheets are not stacked in the order of the original pages, the work efficiency of sorting (collating) in the order of the original pages is extremely low, whether manually or using a sorting unit. .

  Also in the devices of Patent Documents 2 to 7, there is no disclosure of a technique for controlling the plate making so that the discharge order of printed sheets in the double-sided printing of a document of three pages or more is the page order of the document.

On the other hand, in Patent Document 1, after setting a bookbinding form in which a desired page order is set when all printed sheets are folded and overlapped, the operator does not consider changing the order of the print data, and simply uses the machine. A technique is described in which bookbinding printing with a uniform page order can be performed by performing a specific work.
However, Patent Document 1 does not disclose page order control when performing duplex printing in the double speed printing mode.

  Therefore, in view of the above-described problems, the present invention provides a double-sided printing sheet for a page of a document when a double-sided printing is performed at high speed in a double-speed printing mode using a master on which a plurality of images are made. It is an object of the present invention to provide a stencil printing apparatus that is sequentially stacked.

  In order to solve the above-described problems, a stencil printing apparatus according to the present invention includes a plate-making unit that makes a plurality of plate-making images corresponding to a plurality of pages of documents on a master for one plate, plate-making order of plate-making images, and plate-making positions. A printing unit having a control unit that controls the plate-making master, a cylindrical plate cylinder that winds the master made on the outer peripheral surface, and a pressing member that can be brought into contact with and separated from the plate cylinder, and one rotation of the plate cylinder A sheet feeding unit that continuously feeds the same number of printing sheets as the number of plate-making images on the master to the printing unit; and the printing in which the plate-making image is printed by being pressed against the plate cylinder by the pressing member. A paper discharge conveyance unit that peels and conveys the paper from the plate cylinder; and a paper discharge tray that discharges the printing paper after printing is completed. After printing the master-making image of the first master on one side of the paper The printing paper that has been printed on one side is turned upside down and placed on the paper feeding unit, fed again to the printing unit, and the second master printing image is printed on the other side. A plurality of the print sheets are stacked on the paper discharge table, and the control unit sets the stacking order of the double-side printed print sheets discharged to the paper discharge table to be the page order of the original. The stencil printing apparatus is characterized by controlling the plate making.

  According to the stencil printing apparatus of the present invention, when double-sided printing is performed at high speed in the double-speed printing mode using a master on which a plurality of images are made, a double-sided printed paper is printed on the original page. It is possible to provide a stencil printing apparatus that is sequentially stacked.

It is sectional drawing which shows an example of the principal part structure of the stencil printing apparatus of this embodiment. It is sectional drawing which shows an example of the principal part structure of the stencil printing apparatus of this embodiment. It is explanatory drawing which showed the example of the preprinted master wound by the printing drum. (A) is a diagram schematically illustrating an example of a state where paper is discharged after single-sided printing, and (B) is a diagram schematically illustrating an example of a state where the paper is reversed and placed on a paper feeding unit. FIG. 6 is a diagram schematically illustrating an example of a state in which a double-side printed printing sheet is discharged. It is explanatory drawing which showed the example of the preprinted master wound by the printing drum. It is a schematic diagram which shows an example of an operation panel. It is a schematic diagram which shows an example of the guidance displayed on a display part. It is a block diagram which shows an example of a structure of the control means of the stencil printing apparatus of this embodiment. It is a flowchart which shows an example of the flow of the printing method of this embodiment. It is a flowchart which shows an example of the flow of the printing method of this embodiment.

  Hereinafter, a stencil printing apparatus and a printing method according to the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the embodiments of the examples shown below, and other embodiments, additions, modifications, deletions, and the like can be changed within a range that can be conceived by those skilled in the art. Any aspect is included in the scope of the present invention as long as the operations and effects of the present invention are exhibited.

  The stencil printing apparatus of the present invention is made by a plate making unit for making a plurality of plate making images corresponding to a plurality of pages of originals on a master for one plate, a control unit for controlling a plate making order and a plate making position of the plate making images, and plate making. A cylindrical plate cylinder on which the master is wound on the outer peripheral surface, a printing unit having a pressing member which can be contacted and separated from the plate cylinder, and a plate-making image on the master during one rotation of the plate cylinder. A sheet feeding unit that continuously feeds the same number of printing sheets to the printing unit, and the printing sheet on which a plate-making image is printed by being pressed against the plate cylinder by the pressing member is peeled off from the plate cylinder. At least a paper discharge conveyance unit that conveys the print paper, and a paper discharge tray that discharges the print paper after printing is completed.

In double-sided printing, at least two master plates are made in the plate making unit, and a first master plate-making image is printed on one side of the printing paper, and then the printing paper that has been printed on one side is turned upside down. Inverted, placed on the paper feed unit, fed again to the printing unit, printed the second master plate-making image on the other side, and discharged the plurality of double-side printed printing sheets Load on the table.
The control unit controls the plate making so that the stacking order of the printing sheets printed on both sides printed on the paper discharge tray is the page order of the original.

In addition, an operation panel having a display unit is provided, and guidance for placing the single-side printed printing sheet on the paper feeding unit with the front and back reversed is displayed on the display unit.
A printing mode can be selected from the operation panel, and the stencil printing apparatus of this embodiment can select both the normal printing mode and the double speed printing mode.

In the “normal printing mode”, image printing of a maximum A3 size is possible, and the maximum printing speed is, for example, 120 sheets / minute (when the rotational speed of the cylindrical plate cylinder 3 is 120 rpm).
In the “double speed printing mode”, two A4 size images are made side by side on a single stencil sheet, so that a maximum A4 size image can be printed. The maximum printing speed is, for example, 240 sheets / minute (cylindrical) The rotation speed of the plate cylinder 3 is 120 rpm).

FIG. 1 and FIG. 2 show an example of the main configuration of the stencil printing apparatus of this embodiment.
The digital stencil printing apparatus shown in FIGS. 1 and 2 is fed with a master (hereinafter, also referred to as “stencil sheet”) 1 perforated and made by a not-shown plate making unit (plate making apparatus). It is wound around the outer peripheral surface. In the master 1, a plurality of plate-making images corresponding to a plurality of pages of a document are arranged side by side. In this embodiment, two plate-making images are made in the master 1 for one plate.

  The printing paper 4 is separated and fed one by one by a paper feeding unit (paper feeding device) (not shown), and the master 1 on the outer periphery of the plate cylinder 3 is pressed by a pressing member (hereinafter also referred to as “press roller”) 5. Press and stick. An ink supply device 2 is provided inside the plate cylinder 3, and the ink that has passed through the perforated portion is transferred to the pressed printing paper 4 to form a printed image.

The plate making operation is performed by storing a document image read by a scanner in a memory and punching and making a plate according to image information stored in the memory at a predetermined position of the master 1 by a thermal head of the plate making apparatus.
Details of plate-making operation control in double speed printing and double-sided printing, which are the features of the present invention, will be described later.

The printing unit includes a pair of registration rollers on the upstream side in the conveyance direction of the printing paper 4. The registration roller pair includes a lower registration roller 6 that is driven to rotate, and an upper registration roller 7 that rotates while being pressed against the registration roller 6. By controlling the driving timing of the lower registration roller 6 in synchronization with the rotation of the plate cylinder 3, the printing paper 4 can be fed toward the printing unit, and the printing image position with respect to the printing paper 4 can be adjusted. The lower registration roller 6 is driven by a dedicated motor (stepping motor) 25 via a timing belt 24.
An upper guide plate 10 and a lower guide plate 11 are fixedly provided on the registration rollers 6 and 7 at a predetermined interval in order to guide the printing paper 4.

The master 1 thus made is clamped and wound by a clamper 8 provided on a part of the outer periphery of the plate cylinder 3. The clamper 8 portion protrudes outward from the plate cylinder 3. In order to avoid a collision with the convex portion, the press roller 5 swings in the vertical direction in the figure, and reciprocates in accordance with ON / OFF of the printing pressure. The printing pressure is turned on and off by a cam mechanism (not shown).
The arm member 12 that supports the press roller 5 swings around the fulcrum shaft 13.

The printed printing paper 4 on which an image has been formed at the printing nip formed between the press roller 5 and the plate cylinder 3 is peeled off from the plate cylinder 3 at the conveyance discharge section, and is discharged by the air suction belt type. The paper is conveyed toward a paper discharge tray (not shown) by the conveyance device 14.
The air suction belt type paper discharge conveying device 14 has two rollers 15, 16, a plurality of endless perforated belts 17 stretched over the rollers 15, 16, and a hole of the endless perforated belt 17. It consists of an air suction device 18 for sucking.

FIG. 1 shows a state immediately after the leading end region of the printing paper 4 is pressed against the plate cylinder 3 by the press roller 5 and printing is started.
The paper discharge claw member 19 is a member for peeling the printing paper 4 that has passed through the printing pressure nip from the plate cylinder 3. In FIG. 1, the front end portion of the paper discharge claw member 19 approaches the plate cylinder 3 and is discharged. The state where the compressed air which passed the pipe 21 from the front-end | tip part nozzle 20 provided in the front-end | tip vicinity of the paper nail | claw member 19 is discharged is shown.

  An air knife 22 for separating the printed printing paper 4 from the master 1 and transporting it is provided on the upstream side of the printing nip portion in the rotational direction of the plate cylinder 3. The air knife 22 generates strong air pressure by a blower fan 23 and blows air toward the printing pressure nip portion. The blowing air acts to peel the printing paper 4 from the master 1, but the air knife 22 blows continuously during the printing operation.

FIG. 2 shows a state immediately before printing of the first printing paper 4a is finished and printing of the second printing paper 4b is started in printing in the double speed printing mode.
The two printing papers 4a and 4b are continuously fed. The distance H between the trailing edge of the first printing paper 4a and the leading edge of the second printing paper 4b is about 20 to 30 mm.

  A first platemaking image and a second platemaking image are punched in the master 1, the first platemaking image is printed on the first printing paper 4a, and the second platemaking image is printed on the second printing paper 4b. The first plate-making image and the second plate-making image are made on the master 1 side by side with the interval of 20 to 30 mm.

  In FIG. 2, the discharge of compressed air for peeling to the first printing paper 4a from the nozzle 20 at the front end of the paper discharge claw member 19 is finished, and the plate is printed on the second printing paper 4b after printing. In this state, discharge of compressed air is started in order to peel from the body 3. The press roller 5 maintains the printing pressure ON state while the first printing paper 4a and the second printing paper 4b are conveyed.

  A detection sensor 26 for detecting the trailing edge of the printing paper is provided at the upstream exit in the conveyance direction of the nip between the lower registration roller 6 and the upper registration roller 7. The detection sensor 26 may be provided at an inlet on the downstream side in the conveyance direction of the nip.

  The motor 25 that drives the lower registration roller 6 stops rotating when the sensor 26 detects the rear end of the first printing paper 4a. While the motor 25 is stopped, a slight deflection is formed at the tip of the second printing paper 4b whose feeding is stopped. Thereafter, the motor 25 resumes driving at a timing controlled so that the trailing edge of the first printing paper 4a and the leading edge of the second printing paper 4b become a predetermined distance dimension H. The printing paper 4b is conveyed.

Next, the plate making operation will be described.
In the plate making operation when the “double speed printing mode” is selected, it is standard that the A4 image is taken out from the memory and two plates are arranged side by side.
When printing a two-page document in the double-speed printing mode, single-sided printing is performed by using a stencil sheet in which two A4 images of the first and second pages of the document are arranged side by side and printing is performed in units of two pages. In both cases, the printed printing sheets sorted in the page order are stacked on the paper discharge tray.
On the other hand, when performing double-sided printing of an original of 3 pages or more in the double-speed printing mode, in order to make the discharged printing papers sorted in the page order, the plate making order of the plate making images and the plate making are performed when making a plurality of master plates. It is necessary to control the position.

[When printing a 4-page document]
FIG. 3 is a schematic diagram showing a master 1 that has been pre-rolled around a plate cylinder 3 when a four-page document is printed on both sides in the stencil printing apparatus of this embodiment. The expanded state is shown.
As shown in FIG. 3, two plate-making images corresponding to two pages of originals are made side by side on the master 1 for one plate.
In the first master 1a, the plate making images of the fourth and second pages of the original document are made in order from the leading direction (clamping side) of the plate cylinder 3 to be wound, and the second master. In 1b, the plate-making images of the third and first pages of the original document are made in order from the leading direction (clamped side) of the plate cylinder 3 to be wound.

  FIG. 3 shows the correspondence with the printing paper 4 on which the plate-making image is printed. In the first image plate making area 101 where the image of the fourth page of the first master 1a is made, the surface (4a-1) of the printing paper 4a is placed in the second image plate making area 102 where the image of the second page is made. Is the front surface (4b-1) of the printing paper 4b, the third image plate making area 103 where the image of the third page of the second master 1b is made, and the back surface (4a-2) of the printing paper 4a. The back surface (4b-2) of the printing paper 4b corresponds to the fourth image plate making area 104 where the image has been made.

  By performing double-sided printing using the first master 1a and the second master 1b shown in FIG. 3, a set of printing papers 4a and 4b that have been printed on both sides are placed on the paper discharge table with the original. Stacked in the same page order.

FIG. 4A schematically shows a state in which the first master 1a shown in FIG. 3 is used to print on one side of the printing paper 4 (4a and 4b) and then discharged. FIG.
The printing paper 4 loaded in the state shown in FIG. 4A is reversed and placed on the paper feeding unit so as to be in the state shown in FIG. The placed printing paper 4 is fed again to the printing unit, and the plate-making image of the second master 1b is printed on the other side.
In the present embodiment, the front / back reversal is manually performed by an operator. However, in a stencil printing apparatus provided with a reversing mechanism, it may be performed by the reversing mechanism.

In FIG. 5, the plate-making image of the second master 1 b is printed on the printing paper 4 placed on the paper feed unit so as to be in the state shown in FIG. FIG.
As shown in FIG. 5, the printing paper 4a on which the third page is printed on the back side of the fourth page and the printing paper 4b on which the first page is printed on the back side of the second page are sorted in order of pages (collation). In this state, it is loaded on the paper discharge tray.

[When printing a 3-page document]
FIG. 6 is a schematic view showing the master 1 that has been made by the plate cylinder 3 wound around the plate cylinder 3 when the three-page original is printed on both sides in the stencil printing apparatus of the present embodiment. The expanded state is shown.
As shown in FIG. 6, the master 1 for one plate is made by arranging two plate-making images corresponding to two pages of originals.
In the first master 1a, a blank plate and a plate-making image of the second page of the original are made as blank pages in order from the leading direction (clamped side) in the rotation direction of the plate cylinder 3 to be wound. In the master 1b, the plate-making images of the third and first pages of the original are made in order from the leading direction (clamped side) of the plate cylinder 3 to be wound.

FIG. 6 also shows the correspondence with the printing paper 4 on which the plate-making image is printed. In the first image plate making area 101 where the image of the second page of the first master 1a is made, the surface (4b-1) of the printing paper 4b and the image of the third page of the second master 1b are made. The back side (4a-2) of the printing paper 4a corresponds to the two-image plate making area 102, and the back side (4b-2) of the printing paper 4b corresponds to the third image plate making area 103 where the image of the first page is made. .
Note that the surface (4a-1) of the printing paper 4a corresponds to the area of the first master 1a that is an empty plate.

  By performing double-sided printing using the first master 1a and the second master 1b shown in FIG. 6, a set of two sheets of printed paper that has been printed on both sides is the same page as the original on the paper discharge table. Loaded in order.

[When printing a document of 5 pages or more]
When N-page (where N is an integer greater than or equal to 5) originals are printed on both sides, images are extracted in units of four pages, and the plate-making order and plate-making position of the plate-making images are the same as the modes shown in FIGS. By controlling, the discharged print sheets can be collated in page order.
For pages that are less than four pages, plate making and printing can be performed in the conventional double-speed printing mode in units of two pages.
The control unit is configured to wrap the plate cylinder wound around the first master for a 4-page unit of 4n + 1 pages to 4n + 4 pages (where n is an integer equal to or greater than 1. The same applies hereinafter) of the document. The plate-making images of the pages corresponding to the 4n + 4 page and the 4n + 2 page of the document are made in order from the top direction in the rotation direction of the document, and the second master is sequentially ordered from the top direction in the rotation direction of the plate cylinder to be wound. Plate making is controlled so that the plate making images of the pages corresponding to the 4n + 3 page and the 4n + 1 page of the original are made, and if there is no corresponding page, a blank plate that becomes a blank page is made.
By performing double-sided printing using the master plate made in this way, a set of the printing papers (a set of two printing papers) composed of a plurality of sheets that have been printed on both sides in units of four pages can be discharged. They are stacked on the paper table in the same page order as the original.
Further, by combining a known collating device that collates printed sheets, the first page to the Nth page can be stacked sequentially in the page order.

FIG. 7 is a schematic diagram of an operation panel having a display unit.
As shown in FIG. 7, the operation panel 50 includes a display unit (liquid crystal display unit) 110 as a display unit, and includes a counter 120, a plate making start key 130, a printing start key 140, a stop key 150, a numeric keypad 160, and a printing mode switching input. A key 170 or the like is provided.
When the double speed printing mode is selected with the print mode switching input key 170, information is displayed on the display unit 110 or the like to guide the paper setting direction, the setting order, and the like.
Specifically, guidance for displaying a single-side printed printing sheet upside down and placing it on the paper feeding unit is displayed on the display unit 110.

FIG. 8 shows an example of guidance displayed on the display unit 110.
FIG. 8 is a display that guides the operator of the set direction when the double-sided printing is performed in the double-speed printing mode and the printed paper that has been printed on one side is reversed and placed on the paper feeding unit. It is urged to take out the printing paper on the paper table, turn it over and place it on the paper feed table.

FIG. 9 is a block diagram of a control system of the stencil printing apparatus of this embodiment.
As shown in FIG. 9, the control unit 51 controls the plate discharging unit 52, the image reading unit 53, the paper discharge unit 54, the plate making unit 55, the printing unit 56, the paper feeding unit 57, etc. Control.
The control means is a control unit that controls the plate-making unit 55. In the plate-making unit 55, the plate-making is performed so that the stacking order of the double-side printed printing sheets discharged to the paper discharge tray is the page order of the original. Control.
Control by the control means is performed based on input of various signals from the operation panel 50 or the like.

  A plurality of plate-making images corresponding to the document pages are held in the storage unit 58 so as to be readable in an arbitrary order. Examples of the document data held in the storage unit 58 include image data obtained by reading the document by the image reading unit 53 and converting the document into a digital image signal by the A / D conversion board, print data transmitted from a connected PC, and the like. Is mentioned.

[Printing method]
The printing method of the present embodiment is a method of performing double-sided printing in the double speed printing mode using the stencil printing apparatus of the present invention, using a plurality of masters on which a plurality of plate-making images corresponding to a plurality of pages of documents are made, This is a method for performing duplex printing.
The printing method of the present embodiment includes a step of arranging a plurality of plate-making images corresponding to a plurality of pages of originals on a plate master wound around a plate cylinder and a step of printing a plate-making image of a first master. And reverse feeding the printing paper on which the first master plate-making image is printed, printing the second master plate-making image on the back surface of the printing paper, and completion of printing. Discharging the printed paper to a paper discharge unit so that the same page order as the original is placed.

FIG. 10A shows a flowchart of a method for printing a 4-page document, and FIG. 10B shows a flowchart of a method for printing a 3-page document.
FIG. 10A shows a method of printing a four-page document on both sides of two printing sheets.
First, an original is set on the original table, and an original reading start key (not shown) on the operation panel 50 is operated to start reading the original. The document data read by the image reading unit 53 is stored and held in the storage unit 58 (S001). The data held in the storage unit 58 is taken out (S002), and the 4th and 2nd pages are made in order from the top in the rotational direction of the plate cylinder 3 wound around the first master, that is, from the clamp side. The image is made (S003). Next, the plate making images of the third page and the first page are made on the second master in order from the top in the rotation direction of the plate cylinder 3 to be wound, that is, from the clamp side (S004).
Subsequently, the plate cylinder on which the first master is wound is rotated once, and two printing sheets 4 are fed to perform printing (S005). The printing paper on which the plate-making image of the first master is printed is turned upside down and fed again (S006), the plate cylinder around which the second master is wound is rotated once, and the two printed printing papers are fed. 4 is printed (S007). Printing is completed by the above flow.
The printing paper 4 that has been printed on both sides is discharged to the paper discharge unit so that it is in the same page order as the original.

FIG. 10B shows a method of printing a three-page document on both sides of two printing sheets.
First, an original is set on the original table, and an original reading start key (not shown) on the operation panel 50 is operated to start reading the original. The document data read by the image reading unit 53 is stored and held in the storage unit 58 (S101). The data held in the storage unit 58 is taken out (S102), and the first master has a blank plate and two pages that become blank pages in order from the top in the rotation direction of the plate cylinder 3 wound around, that is, from the clamp side. The prepress image of the eye is made (S103). Next, the plate making images of the third page and the first page are made on the second master in order from the top in the rotation direction of the plate cylinder 3 to be wound, that is, from the clamp side (S104).
Subsequently, the plate cylinder on which the first master is wound is rotated once, and two printing sheets 4 are fed to perform printing (S105). The printing paper on which the plate-making image of the first master is printed is turned upside down and fed again (S106), the plate cylinder around which the second master is wound is rotated once, and the two printed printing papers are fed. 4 is printed (S107). Printing is completed by the above flow.
The printing paper 4 that has been printed on both sides is discharged to the paper discharge unit so that it is in the same page order as the original.

FIG. 11 shows a flowchart of a method for printing an N-page document (especially when N is an integer of 5 or more) on both sides of a plurality of printing papers.
First, a document is set on a document placement table, and reading is performed up to the last page (S201). It is determined whether the number of pages of the unprinted document is 4 pages or more (S202). If the number of pages is 4 pages or more, the image reading unit 53 reads the document data and stores it in the storage unit 58 (S203). ), The data held in the storage unit 58 is taken out in units of four pages (S204). The 4-page unit is a 4n + 1 page to a 4n + 4 page (where n is an integer of 1 or more, and so on).

  In the first master, plate-making images of pages corresponding to the 4n + 4th page and the 4n + 2th page of the document are made in order from the leading direction in the rotation direction of the plate cylinder to be wound, that is, from the clamp side (S206). In the master No. 2, plate-making images of pages corresponding to the 4n + 3 page and the 4n + 1 page are sequentially made from the leading direction in the rotation direction of the plate cylinder to be wound, that is, from the clamp side (S206).

  Subsequently, the plate cylinder on which the first master is wound is rotated once, and two printing sheets 4 are fed to perform printing (S207). The printing paper on which the plate-making image of the first master is printed is turned upside down and fed again (S208), the plate cylinder around which the second master is wound is rotated once, and the two printed printing papers are fed. 4 is printed (S209). It is determined whether printing of all pages of the document has been completed. If printing has been completed, printing is terminated. If there is an unprinted page, it is determined again whether the number of pages of the unprinted document is 4 or more (S202).

On the other hand, if the unprinted document is not 4 pages or more (3 pages or less), the document data is read and stored in the storage unit 58 (S211), and the data held in the storage unit 58 is stored. Take out (S212).
In the first master, a plate making image of a blank plate that becomes a blank page and a page corresponding to the 4n + 2 page in order from the leading direction in the rotational direction of the plate cylinder to be wound, that is, from the clamp side, is made (S213). In the second master, plate making images of pages corresponding to the 4n + 3 page and the 4n + 1 page are sequentially made from the leading direction in the rotation direction of the plate cylinder to be wound, that is, from the clamp side (S214). If there is no corresponding page, a blank plate that becomes a blank page is made.

Subsequently, the plate cylinder on which the first master is wound is rotated once, and two printing papers 4 are fed to perform printing (S215). The printing paper on which the plate-making image of the first master is printed is turned upside down and fed again (S208), the plate cylinder around which the second master is wound is rotated once, and the two printed printing papers are fed. 4 is printed (S209). It is determined whether printing of all pages of the document has been completed. If printing has been completed, printing is terminated.
Further, when the unprinted document is two pages or one page, the plate making and printing may be performed on the page by a conventional method.

According to the printing method of this embodiment, by performing double-sided printing at a high speed in the double-speed printing mode using a master on which a plurality of images are made by using a master on which a plurality of images are made, a double-sided printed paper is placed on a paper discharge tray. Loaded in page order.
Note that the terms “rear surface” and “front surface” of the printing paper in this embodiment represent the other surface relative to one surface, and are not absolute.

1 Master (stencil paper)
2 Ink supply device 3 Plate cylinder 4 Printing paper 5 Press member (press roller)
6 Upper Registration Roller 7 Lower Registration Roller 8 Clamper 19 Discharge Claw Member 25 Drive Motor 26 Detection Sensor 50 Operation Panel 110 Display Unit (Liquid Crystal Display Unit)

Japanese Patent No. 5086614 JP 2008-6656 A JP 2002-29133 A JP 2006-15572 A Japanese Patent No. 4355123 Japanese Patent No. 3940036 JP-A-6-71996

Claims (6)

A plate making unit for making a plate by arranging a plurality of plate making images corresponding to a document of a plurality of pages on a master for one plate;
A control unit for controlling the plate making sequence and the plate making position of the plate making image;
A cylindrical plate cylinder that winds the master made on the outer peripheral surface, and a printing unit that includes a pressing member that is detachable from the plate cylinder;
A sheet feeding unit that continuously feeds the same number of printing sheets as the number of plate-making images on the master during one rotation of the plate cylinder;
A paper discharge conveyance unit that peels and conveys the printing paper on which the platemaking image is printed by being pressed against the plate cylinder by the pressing member;
A discharge stand for discharging the printing paper after printing is completed,
After making the master for at least two plates and printing the first master plate-making image on one side of the printing paper, the printing paper that has been printed on one side is turned upside down to the paper feeding unit. Placed, fed again to the printing unit, printed the second master plate-making image on the other side, and stacking a plurality of printed sheets on both sides printed on the discharge table,
The stencil printing apparatus, wherein the control unit controls the plate making so that a stacking order of the printing sheets printed on both sides printed on the paper discharge tray is a page order of the original. When printing a 4-page document on both sides,
The plate making unit makes plate making by arranging two plate making images corresponding to a two-page document on a master for one plate,
The control unit makes plate-making images of the fourth and second pages of the document in order from the leading direction in the rotation direction of the plate cylinder to be wound on the first master, and the second master The plate making is controlled so that the plate making images of the third page and the first page of the original document are made in order from the leading direction of the rotation direction of the plate cylinder to be wound,
2. The stencil printing apparatus according to claim 1, wherein a set of the two sheets of printed paper on which duplex printing has been performed is stacked on the paper discharge table in the same page order as the original. When printing a 3-page document on both sides,
The plate making unit makes plate making by arranging two plate making images corresponding to a two-page document on a master for one plate,
In the first master, a blank plate that becomes a blank page and a plate-making image of the second page of the document in order from the leading direction in the rotation direction of the plate cylinder to be wound are made on the first master. The master of No. 2 controls the plate-making so that the plate-making images of the third page and the first page of the document are made in order from the leading direction in the rotational direction of the plate cylinder to be wound,
2. The stencil printing apparatus according to claim 1, wherein a set of the two sheets of printed paper on which duplex printing has been performed is stacked on the paper discharge table in the same page order as the original. When double-sided printing N pages (where N is an integer greater than 5),
The plate making unit makes plate making by arranging two plate making images corresponding to a two-page document on a master for one plate,
The control unit is configured to wrap the plate cylinder wound around the first master for a 4-page unit of 4n + 1 pages to 4n + 4 pages (where n is an integer equal to or greater than 1. The same applies hereinafter) of the document. The plate-making images of the pages corresponding to the 4n + 4 page and the 4n + 2 page of the document are made in order from the top direction in the rotation direction of the document, and the second master is sequentially ordered from the top direction in the rotation direction of the plate cylinder to be wound. The plate making images of pages corresponding to the 4n + 3 page and the 4n + 1 page of the manuscript are made, and when there is no corresponding page, the plate making is controlled so that a blank plate that becomes a blank page is made,
2. The stencil printing apparatus according to claim 1, wherein a set of the printing sheets composed of a plurality of sheets on which double-sided printing has been performed is stacked on the paper discharge table in the same page order as the original. An operation panel having a display unit;
5. The stencil according to claim 1, wherein a guide when the printing paper that has been printed on one side is reversed and placed on the paper feeding unit is displayed on the display unit. 6. Printing device. A method of performing double-sided printing using a plurality of masters on which a plurality of plate-making images corresponding to a multi-page document are made,
Arranging a plurality of plate-making images corresponding to a plurality of pages of a document on a master for one plate wound around a plate cylinder;
Printing a first master plate-making image, reversing the printing paper on which the first master plate-making image is printed, and feeding it again; and printing a second master plate-making image; A printing method comprising: printing on the back side of a sheet; and discharging the printed sheet that has been printed to a sheet discharge unit so as to be in the same page order as the original.

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