JP2008290296A - Stencil printing machine - Google Patents

Abstract

A stencil printing apparatus capable of contributing to cost reduction of a master by automatically performing double-sided printing is provided.
As a printing mode, it is possible to switch between a single-sided printing mode for performing single-sided printing and a double-sided printing mode. During double-sided printing, a paper feed tray for double-sided printing is selected from paper feed trays 46, 47, and 48. In the stencil printing apparatus 1 in which the divided master-making master 14 is wound on the plate cylinder 11, when a plurality of documents are placed on the automatic document reader 61 and a paper feed tray for double-sided printing is selected, The control unit is configured to automatically switch the print mode to the double-sided print mode.
[Selection] Figure 1

Description

  The present invention relates to a stencil printing apparatus capable of forming two-side plate-making images on one master and performing one-step duplex printing.

  Conventionally, digital thermal stencil printing is known as a simple printing method. This is because a thermal head having a plurality of fine heating elements is brought into contact with a master obtained by bonding a thermoplastic resin film and a porous support, and the master is placed on a platen roller or the like while energizing the heating elements in a pulsed manner. After the punched image based on the image information is hot-melt perforated and engraved on the thermoplastic resin film of the master by conveying with a conveying means, the perforated master is wound around a porous cylindrical plate cylinder and pressed. By pressing the paper against the outer peripheral surface of the plate cylinder by pressing means such as a roller, the ink supplied to the inner peripheral surface of the plate cylinder is oozed out from the plate cylinder opening portion and the master punching portion, and this ink is transferred to the paper A printed image is obtained on a sheet.

  In the stencil printing described above, duplex printing has recently been frequently performed in which printing is performed on both sides of a sheet for the purpose of reducing the amount of paper consumed and the storage space for documents. As an example of this, a divided pre-printed master in which the first plate-making image and the second plate-making image are arranged in two directions in the direction of rotation of the plate cylinder is used. After the plate-making image is printed, this paper is guided to the auxiliary tray, and after one plate-making image is printed on the surface of the second sheet fed from the paper feeding unit, this paper is guided to the auxiliary tray, and the auxiliary tray The first sheet is re-feeded from the tray, the other plate-making image is printed on this back surface, this sheet is discharged to the sheet discharge tray, and this operation is continuously performed to obtain a double-sided printed matter in one step. A stencil printing apparatus is disclosed in, for example, “Patent Document 1”.

JP 2005-246730 A

  When a plurality of originals are printed on one side in the stencil printing apparatus disclosed in “Patent Document 1”, it is necessary to make a master having the same number of originals as the number of originals. In this case, when making a plate while saving the master, the number of masters can be halved by using the function of consolidating two-page originals into one page, but the characters are too small as a printed image. There is a problem in that an unreadable one or an image that is crushed is output.

  Therefore, when saving the master in the above-described stencil printing apparatus, it is conceivable to perform double-sided printing that forms two plate-making images on one master. According to this double-sided printing, an uncomfortable print image can be obtained because the size of the image is not changed, but the operator does not know the function of double-sided printing, forgets to set the double-sided printing, or due to an operation error. If double-sided printing is not set, single-sided printing is performed, and plate making operations to the master for the number of originals are performed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stencil printing apparatus capable of solving the above-mentioned problems and contributing to cost reduction of a master by automatically performing double-sided printing without an operator's awareness.

  According to the first aspect of the present invention, there are provided a printing cylinder having a plate cylinder rotatably supported by the apparatus main body, a pressing unit provided so as to be able to contact with and separate from the plate cylinder, and a plurality of paper feed trays for storing paper. An automatic document reader that automatically reads one or a plurality of documents, and temporarily stores a sheet on which a print image is formed in the printing unit, and then directs the sheet to the printing unit. A single-sided printing mode for performing single-sided printing as a printing mode and a surface on one side of the paper, and printing on the basis of image information read by the automatic document reading device. It is possible to switch between a double-sided printing mode for performing double-sided printing for performing double-sided printing for performing a backside printing step for printing a backside image on the other side of the paper after performing a front side printing step for printing an image. Paper feed In the stencil printing apparatus for selecting the sheet feeding tray for double-sided printing from (a) and winding a divided plate-making master in which two first and second plate-making images are arranged on the plate cylinder, the automatic document Control means for automatically switching the printing mode to the duplex printing mode when a plurality of documents are placed on the reading device and the paper feed tray for duplex printing is selected.

  According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, it is possible to perform printing based on image information sent from a connected external device, and a plurality of image information from the external device. Or a plurality of image information sent from the external device is accumulated and the control unit automatically switches the printing mode to the duplex printing mode when the paper feed tray for duplex printing is selected. It is characterized by.

  According to a third aspect of the present invention, there is provided a printing unit having a plate cylinder rotatably supported by the apparatus main body, a pressing unit provided so as to be able to contact with and separate from the plate cylinder, and one or more originals automatically. An automatic document reading device that automatically reads, and a paper refeeding unit that re-feeds the paper on which the printed image is formed on the surface of the automatic document reading device toward the printing unit after temporarily storing the paper, Printing is performed based on the image information read by the automatic document reader, and the one side printing mode for performing single side printing as the printing mode and the surface printing process for printing the surface image on one side of the paper are performed, and then the other side of the paper is performed. It is possible to switch between a double-sided printing mode for performing double-sided printing for performing a backside printing process for printing a backside image on the surface of the first side, and two sides of the first platemaking image and the second platemaking image on the plate cylinder during double-sided printing. Lined division pre-printed In the stencil printing apparatus that winds the master, the paper size used for printing can be set, and when a plurality of originals are placed on the automatic document reader and the paper size for double-sided printing is set. The control means automatically switches the printing mode to the duplex printing mode.

  According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect, it is possible to perform printing based on image information sent from a connected external device, and a plurality of pieces of image information from the external device. Or a plurality of image information sent from the external device and the paper size for duplex printing is set, the control means automatically switches the printing mode to the duplex printing mode. And

  According to a fifth aspect of the present invention, a printing unit having a plate cylinder rotatably supported by an apparatus main body and a pressing unit provided so as to be able to contact with and separate from the plate cylinder and one or a plurality of originals are automatically printed. An automatic document reading device that automatically reads, and a paper refeeding unit that re-feeds the paper on which the printed image is formed on the surface of the automatic document reading device toward the printing unit after temporarily storing the paper, Printing is performed based on the image information read by the automatic document reader, and the one side printing mode for performing single side printing as the printing mode and the surface printing process for printing the surface image on one side of the paper are performed, and then the other side of the paper is performed. It is possible to switch between a double-sided printing mode for performing double-sided printing for performing a backside printing process for printing a backside image on the surface of the first side, and two sides of the first platemaking image and the second platemaking image on the plate cylinder during double-sided printing. Lined division pre-printed In the stencil printing apparatus in which the master is wound, when a plurality of originals are placed on the automatic original reading apparatus and the number of printed sheets equal to or larger than a predetermined number is set, the control means automatically sets the print mode. It is characterized by switching to the duplex printing mode.

  According to a sixth aspect of the present invention, in the stencil printing apparatus according to the fifth aspect, it is possible to perform printing based on image information sent from a connected external device, and a plurality of image information from the external device. Or a plurality of pieces of image information sent from the external apparatus are accumulated and a predetermined number of printed sheets or more are entered, the control means automatically switches the printing mode to the duplex printing mode. Features.

  According to a seventh aspect of the present invention, in the stencil printing apparatus according to any one of the first to sixth aspects, the control unit can further select whether or not to automatically switch the printing mode to the duplex printing mode. It is characterized by that.

  According to an eighth aspect of the present invention, in the stencil printing apparatus according to any one of the first to sixth aspects, the control unit further automatically switches the printing mode to the duplex printing mode, and the control. It is possible to select a second mode in which the means can select whether to automatically switch the print mode to the double-sided print mode.

  According to the present invention, when the operator forgets to set the double-sided printing mode or does not know that the double-sided printing mode is set, and even when the double-sided printing mode is not set by performing an inappropriate operation, the number of documents and the paper to be used are set. The control means determines the tray type and the duplex printing mode is automatically set, so the duplex printing can be performed automatically without the operator's awareness, and the cost of master and paper consumption is reduced by half. Reduction can be achieved.

  FIG. 1 shows a stencil printing apparatus that employs a first embodiment of the present invention. Since this stencil printing apparatus has a configuration related to the double-sided printing apparatus disclosed in Japanese Patent Application Laid-Open No. 2003-200355, description of each part is omitted as much as possible.

  In FIG. 1, a stencil printing apparatus 1 includes a printing unit 2, a plate making unit 3, a paper feeding unit 4, a plate discharging unit 5, a paper discharging unit 6, an image reading unit 7, a refeed unit 9 having an auxiliary tray 8, and a switching member 10. Etc.

  The printing unit 2 disposed almost at the center of the apparatus main body 42 includes a plate cylinder 11 and a press roller 12 as pressing means. The plate cylinder 11 is rotatably supported by the apparatus main body 42 and is driven to rotate by a plate cylinder driving means (not shown). The plate cylinder 11 has an openable / closable clamper 13 on the outer peripheral surface thereof, and the divided pre-made master 14 made by the plate making unit 3 is wound around the outer peripheral surface of the plate cylinder 11 at the time of duplex printing. The divided master-making master 14 is formed with a first master-making image corresponding to the front image and a second master-making image corresponding to the back image, and an un-made part is formed between the master-making images. On the plate cylinder 11, the divided plate-making master 14 is wound so that the first plate-making image corresponds to the front surface region shown in FIG. 1, the second plate-making image corresponds to the same back surface region, and the non-plate making portion corresponds to the same intermediate region. Be dressed. A rotary encoder (not shown) for detecting the position of the plate cylinder 11 is provided in the vicinity of the outer peripheral surface of the plate cylinder 11.

  A press roller 12 is disposed below the plate cylinder 11. The press roller 12 made of an elastic material having water repellency such as a fluororesin is rotatably supported at both ends by an arm member (not shown), and the arm member (not shown) is supported by a swinging means (not shown) so as to be swingable. Yes. The press roller 12 selectively occupies the separation position shown in FIG. 1 where the circumferential surface is separated from the plate cylinder 11 and the pressure contact position where the circumferential surface is in pressure contact with the divided plate-making master 14 on the plate cylinder 11. In the vicinity of the peripheral surface of the press roller 12, a cleaning roller 16 that performs cleaning by contacting the peripheral surface of the press roller 12 is disposed. The cleaning roller 16 is rotationally driven by a driving unit (not shown).

  In the vicinity of the right side of the press roller 12, a refeed guide member 17 is provided for transporting the surface-printed paper P sent from the refeed unit 9 along the peripheral surface of the press roller 12. A re-feeding registration roller 18 is disposed below the press roller 12 and feeds the paper P stored on the auxiliary tray 8 in contact with the peripheral surface of the press roller 12. A refeed conveyance unit 19 having an auxiliary tray 8 on the upper surface is disposed on the lower left side of the press roller 12, and a refeed positioning member 20 is provided integrally therewith. A sheet receiving plate 21 that is movable along the upper surface of the auxiliary tray 8 is disposed above the refeed conveyance unit 19. The auxiliary tray 8, the refeed guide member 17, the refeed registration roller 18, the refeed positioning member 20, the refeed conveyance unit 19, and the sheet receiving plate 21 constitute a refeed unit 9.

  On the left side of the contact position between the plate cylinder 11 and the press roller 12, the switching member 10 is disposed on the conveyance path of the paper P. The switching member 10 is rotatably supported by the apparatus main body 42 at the downstream end portion in the paper conveyance direction, and is moved by a moving means (not shown), and is indicated by a first position indicated by a solid line and a two-dot chain line in FIG. Selectively occupying the second position. The paper P that has passed between the plate cylinder 11 and the press roller 12 is guided to the paper discharge unit 6 when the switching member 10 occupies the first position, and the switching member 10 occupies the second position. Is guided to the auxiliary tray 8.

  A plate making unit 3 is disposed on the upper right side of the printing unit 2. The plate making unit 3 includes a master holding member 23 that holds a master roll obtained by winding a master 22 in a roll shape, a platen roller 24, a thermal head 25, a master cutting unit 26, a master stock unit 27, a tension roller pair 28, and a reverse roller pair. In the plate making unit 3, the divided plate-making master 14 is created.

  A sheet feeding unit 4 is disposed below the plate making unit 3. The paper feed unit 4 includes a first paper feed tray 46, a second paper feed tray 47, a third paper feed tray 48, a first paper feed roller 49, a second paper feed roller 50, a third paper feed roller 51, and a transport roller. A pair 52, a registration roller pair 53, and the like are included. In the present embodiment, the stencil printing apparatus 1 is configured to be able to print a maximum of A3 size paper P, and the first paper feed tray 46 can print on both sides of B5 size or less, B5 size and A4 size paper P which can be printed on both sides. The second paper feed tray 47 stores B4 size paper and A3 size paper P that cannot be printed on both sides. All the sizes of paper P can be stacked on the third paper feed tray 48, and each paper feed tray 46, 47, 48 is provided with a paper size detection sensor for detecting the size of the paper P stored and stacked. ing.

  The plate discharging unit 5 disposed on the upper left side of the printing unit 2 has a well-known configuration including an upper plate discharging member, a lower plate discharging member, a plate discharging box, a compression plate, and the like. Is peeled off from the outer peripheral surface of the plate and discarded inside the plate removal box.

  A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 31, a paper discharge transport unit 32, a paper discharge tray 33, a peeling fan 34, and the like. The front end of the peeling claw 31 is provided so as to be close to and away from the outer peripheral surface of the plate cylinder 11 by a swinging means (not shown), and the paper P from the outer peripheral surface of the plate cylinder 11 when occupied. To peel off. The paper discharge conveyance unit 32 includes a driving roller, a driven roller, an endless belt, a suction fan, and the like, and conveys the printed paper P on the upper surface of the endless belt in the arrow direction of FIG. The paper discharge tray 33 has one end fence and a pair of side fences, and the printed paper P is stacked on the upper surface thereof. The peeling fan 34 is disposed above the peeling claw 31 and is blown toward the outer peripheral surface of the plate cylinder 11 to finish the surface printing process and is peeled off from the outer peripheral surface of the plate cylinder 11 by the switching member 10. The leading edge of the sheet P to be peeled off and the sheet P peeled off from the outer peripheral surface of the plate cylinder 11 by the peeling claw 31 after finishing the back surface printing process is raised by air blowing.

  An image reading unit 7 is disposed on the upper part of the apparatus main body. The image reading unit 7 focuses the contact glass 54, a pressure plate 55 provided so as to be able to come in contact with and away from the contact glass 54, reflection mirrors 56 and 57 and a fluorescent lamp 58 that scan and read a document image, and the scanned image. A lens 59, an image sensor 60 for processing the focused image, and the like are provided, and an ADF unit 61, which is an automatic document reading device, is provided on the upper portion thereof. The ADF unit 61 has a document tray 62 on which a plurality of documents can be placed, and the document tray 62 is provided with a document sensor 63 that detects the presence or absence of a document.

  FIG. 2 shows an operation panel of the stencil printing apparatus 1. In the figure, the operation panel 15 is pressed to perform a plate making start key 35, a printing start key 36, a stop key 37, a numeric keypad 38, a display device 39 comprising a 7-segment LED, a display device 40 comprising an LCD, and double-sided printing. In addition to the well-known configuration such as the double-sided printing key 41, a tray selection key 64 is provided for selecting which of the paper feed trays 46, 47, 48 is used during printing. Each time the operator presses the tray selection key 64, the tray to be used is switched to the first paper feed tray 46, the second paper feed tray 47, and the third paper feed tray 48, and the selected tray is displayed on the display device 40. Is done.

  FIG. 3 is a block diagram of control means used in the stencil printing apparatus 1. In the figure, the control means 30 is a microcomputer having a CPU 43, a ROM 44, a RAM 45, etc. therein, and based on an operation signal from a rotary encoder and an operation panel 15 (not shown) and a detection signal from each sensor, The operations of the unit 3, the sheet feeding unit 4, the plate discharging unit 5, the sheet discharging unit 6, the image reading unit 7, the refeed unit 9, the switching member 10 and the solenoid 50 are controlled. The ROM 44 stores an operation program of the stencil printing apparatus 1, and various values and information are temporarily stored in the RAM 45. The CPU 43 stores the values and information stored in the RAM 45 and the operations called from the ROM 44. The operation of the stencil printing apparatus 1 is controlled based on the program.

  In the stencil printing apparatus 1 described above, a single-sided printing mode is set by setting the original in the image reading unit 7 and pressing the plate making start key 35 without pressing the double-sided printing key 41, and the plate discharging unit 5 operates. After the plate removal operation is performed, the plate making unit 3 is operated to perform the plate making operation, and the plate making master is wound around the plate cylinder 11 to enter a single-sided printing standby state. Thereafter, after the paper feed tray is selected and the number of prints is set, the print start key 36 is pressed, whereby the paper P is continuously fed from the paper feed unit 4 and the single-sided printing operation is performed. When the number of printed sheets reaches the set number, the single-sided printing operation is completed, and the stencil printing apparatus 1 enters the single-sided printing standby state again.

  During this single-sided printing, a plurality of originals are placed on the original tray 62 of the ADF unit 61, a mode for continuously performing the plate making operation and the printing operation is set, and then the paper feed tray is selected, and the number of printed sheets When the plate-making start key 35 is pressed without pressing the double-sided printing key 41 after the number is entered, the single-sided printing mode is set. When the plate-making start key 35 is pressed, After the plate removal operation and the plate making operation are performed and the plate making master is wound around the plate cylinder 11, the paper P is continuously fed from the paper feeding unit 4 to perform the single side printing operation, and the numbered printing is performed. When the number of sheets reaches, the reading operation, the plate removing operation, the plate making operation, and the printing operation for the second original are continuously performed. When the reading operation, the plate discharging operation, the plate making operation, and the printing operation are completed after the document sensor 63 no longer detects the document, the stencil printing apparatus 1 enters the single-sided printing standby state again.

  In addition, when the original is set in the image reading unit 7 and the duplex printing key 41 is pressed and then the plate making start key 35 is pressed, the duplex printing mode is set, and the discharging unit 5 is activated to perform the discharging operation. After that, the plate making unit 3 is operated to perform the plate making operation, and the divided plate making master 14 is wound around the plate cylinder 11 to enter the duplex printing standby state. Thereafter, after the paper feed tray is selected and the number of printed sheets is set, the print start key 36 is pressed, so that the paper P is continuously fed from the paper feed unit 4 and duplex printing is performed. When the set number of printed sheets is reached, the double-sided printing operation is completed, and the stencil printing apparatus 1 enters the double-sided printing standby state again.

  During this double-sided printing, a plurality of documents are placed on the document tray 62 of the ADF unit 61, a mode in which a plate making operation and a printing operation are continuously performed is set, a paper feed tray is selected, and the number of printed sheets When the plate making start key is pressed after the double-sided printing key 41 is pressed, the double-sided printing mode is set. When the plate-making start key 35 is pressed, the reading operation, plate discharging operation, After the plate making operation is performed and the divided master 14 is wound around the plate cylinder 11, the paper P is continuously fed from the paper feeding unit 4 to perform double-sided printing, and the number of printed sheets is reached. When it reaches, the reading operation, the plate removing operation, the plate making operation, and the printing operation for the second original are continuously performed. When the reading operation, the plate discharging operation, the plate making operation, and the printing operation are completed after the document sensor 63 no longer detects the document, the stencil printing apparatus 1 enters the duplex printing standby state again.

  In the above-described double-sided printing operation, a paper-feeding tray that is unsuitable for double-sided printing when the paper-feeding tray is selected (in this embodiment, the double-sided printing operation is possible up to A4 size, so the unsuitable paper-feeding tray is the second paper-feeding tray. When the sheet feeding tray 48 loaded with sheets P exceeding 47 and A4 size is selected, the control unit 30 displays on the display device 40 that the sheet feeding tray is inappropriate and makes the plate making. The input from the start key 35 and the print start key 36 is invalidated.

  In the stencil printing apparatus 1 described above, when performing double-sided printing with a plurality of documents using the ADF unit 61 in order to save the master 22 and the paper P, the operator forgets to press the double-sided printing key 41 or presses it. If it is not known, a single-sided printing operation is performed to create a master for which the number of originals has been made, and the number of sheets P required for double-sided printing is required. In the present invention, such a problem is prevented from occurring, and a configuration is adopted in which double-sided printing is possible even when the user forgets to press the double-sided printing key 41 or does not know to press it. Hereinafter, the operation in the first embodiment of the present invention will be described with reference to the flowchart shown in FIG.

  After an original is set on the document tray 62 by the operator and a mode for continuously performing the plate making operation and the printing operation is set, the paper feed tray to be used is selected, and after the number of prints is set, the plate making start key 35 is set. When is pressed, the ADF unit 61 operates to feed one document on the document tray 62 (ST1). After feeding, it is determined whether or not the document sensor 63 is on (ST2). If the document sensor 63 is on, it is determined that a plurality of documents are placed on the document tray 62; Next, it is determined whether or not a tray capable of duplex printing (the first paper feed tray 46 and the third paper feed tray 48 loaded with paper P of A4 size or less) is selected as the paper feed tray ( ST3). When a tray capable of duplex printing is selected, the control unit 30 automatically sets the duplex printing mode (ST4), creates job parameters in the duplex printing mode (ST5), and stores them in the stencil printing apparatus 1. A plate making operation and a printing operation in the duplex printing mode are performed (ST6).

  If the document sensor 63 is not turned on in ST2, it is determined that the second and subsequent documents are not placed on the document tray 62, and the control unit 30 automatically sets the single-sided printing mode (ST7). ) Create job parameters in the single-sided printing mode (ST8), and cause the stencil printing apparatus 1 to perform the plate making operation and the printing operation in the single-sided printing mode (ST9). If a tray that cannot perform double-sided printing is selected in ST3 even if the document sensor 63 is turned on in ST2, the control means 30 automatically sets the single-sided printing mode and performs a job in the single-sided printing mode. Parameters are created, and the stencil printing apparatus 1 is caused to perform a plate making operation and a printing operation in the single-sided printing mode.

  According to this configuration, even when the operator forgets to press the double-sided printing key 41 or does not know that the double-sided printing key 41 has been pressed, and even when the double-sided printing mode is not set by performing an inappropriate operation, Since the control means 30 determines the type of the paper tray and the double-sided printing is automatically performed, the double-sided printing can be performed automatically without the operator being aware of it, and the consumption of the master and the paper P is reduced by half. Cost reduction can be achieved.

  FIG. 5 shows a stencil printing apparatus used in the second embodiment of the present invention. Compared with the stencil printing apparatus 1 shown in the first embodiment, the stencil printing apparatus 65 is connected online to an external device 66 such as a personal computer, so that online plate making and plate making of accumulated images are possible. It differs only in the point which is comprised, and the other structure is the same. The operation in the second embodiment will be described based on the flowchart shown in FIG.

  After the image data is transmitted from the external device 66 and the mode for continuously performing the plate making operation and the printing operation is set, the paper feed tray to be used is selected, and after the number of prints is set, the plate making start key 35 is pressed. Then, the control unit 30 draws the received image data on the memory (ST11). After drawing, it is determined whether or not the next image data has been received (ST12). If it is determined that the next image data has been received, a tray capable of duplex printing is selected as the next paper feed tray. It is determined whether or not there is (ST13). If a tray capable of duplex printing is selected, the control unit 30 automatically sets the duplex printing mode (ST14), creates job parameters in the duplex printing mode (ST15), and stores them in the stencil printing apparatus 1. The plate making operation and the printing operation in the duplex printing mode are performed (ST16).

  If it is determined in ST12 that the next image data has not been received, the control means 30 automatically sets the single-sided printing mode (ST17) and creates job parameters in the single-sided printing mode (ST18). 1, the plate making operation and the printing operation in the single-sided printing mode are performed (ST19). If the tray that cannot perform duplex printing is selected in ST13 even if the next image data is received in ST12, the control means 30 automatically sets the single-sided printing mode to the single-sided printing mode. Job parameters are created, and the stencil printing apparatus 1 is caused to perform plate making operation and printing operation in the single-sided printing mode.

  According to this configuration, the number of received image data even when the operator forgets to press the double-sided printing key 41 or does not know that the double-sided printing key 41 is pressed, and even when the double-sided printing mode is not set by performing an inappropriate operation. Since the control means 30 determines the type of paper feed tray to be used and the double-sided printing is automatically performed, the double-sided printing can be performed automatically without the operator being aware of the consumption of the master and the paper P. The cost can be reduced by half.

  Next, a third embodiment of the present invention will be described. This third embodiment can be applied to both the stencil printing apparatus 1 and the stencil printing apparatus 65 described above, and here, an example applied to the stencil printing apparatus 1 will be described. In the first embodiment, the paper feed tray to be used is selected by the tray selection key 64. However, in the third embodiment, the size of the paper P to be used is set by a paper size selection key (not shown) on the operation panel 15. The configuration is selected. The operation in the third embodiment of the present invention will be described below based on the flowchart shown in FIG.

  After the operator sets a document on the document tray 62 and sets a mode for continuously performing the plate making operation and the printing operation, the paper size to be used is selected, and after the number of prints is set, the plate making start key 35 is pressed. When pressed, the ADF unit 61 operates to feed one document on the document tray 62 (ST21). After feeding, it is determined whether or not the document sensor 63 is on (ST22). If the document sensor 63 is on, it is determined that a plurality of documents are placed on the document tray 62; Next, it is determined whether or not a paper size that allows double-sided printing (A4 size or smaller) is selected (ST23). When a paper size capable of duplex printing is selected, the control unit 30 automatically sets the duplex printing mode (ST24), creates job parameters in the duplex printing mode (ST25), and the stencil printing apparatus 1 The plate making operation and the printing operation in the duplex printing mode are performed (ST26).

  If the document sensor 63 is not turned on in ST22, it is determined that the second and subsequent documents are not placed on the document tray 62, and the control unit 30 automatically sets the single-sided printing mode (ST27). ) Create job parameters in the single-sided printing mode (ST28), and cause the stencil printing apparatus 1 to perform the plate making operation and the printing operation in the single-sided printing mode (ST29). If a paper size that cannot be printed on both sides is selected in ST23 even if the document sensor 63 is turned on in ST22, the control unit 30 automatically sets the single-sided printing mode and switches to the single-sided printing mode. Job parameters are created, and the stencil printing apparatus 1 is caused to perform plate making operation and printing operation in the single-sided printing mode.

  According to this configuration, even when the operator forgets to press the double-sided printing key 41 or does not know that the double-sided printing key 41 is pressed, and even when the double-sided printing mode is not set by performing an inappropriate operation, the number of documents and the paper to be used Since the control means 30 determines the size and the double-sided printing is automatically performed, the double-sided printing can be automatically performed without the operator being aware of it, and the consumption of the master and the paper P can be halved to reduce the cost. Can be planned.

  Next, a fourth embodiment of the present invention will be described. The fourth embodiment can be applied to both the stencil printing apparatus 1 and the stencil printing apparatus 65 described above, and here, an example applied to the stencil printing apparatus 1 will be described. The operation in the fourth embodiment of the present invention will be described below based on the flowchart shown in FIG.

  After the original is set on the original tray 62 by the operator, a mode for continuously performing the plate making operation and the printing operation is set. When the plate making start key 35 is pressed after the number of prints is set, the ADF unit 61 operates to feed one document on the document tray 62 (ST31). After feeding, it is determined whether or not the document sensor 63 is on (ST32). If the document sensor 63 is on, it is determined that a plurality of documents are placed on the document tray 62, and Next, it is determined whether or not the number of printed sheets is set to a predetermined value or more (ST33). If the number of printed sheets equal to or greater than the predetermined value is set, the control unit 30 automatically sets the duplex printing mode (ST34), creates job parameters in the duplex printing mode (ST35), and causes the stencil printing apparatus 1 to perform duplex printing. The plate making operation and the printing operation in the printing mode are performed (ST36).

  If the document sensor 63 is not turned on in ST32, it is determined that the second and subsequent documents are not placed on the document tray 62, and the control unit 30 automatically sets the single-sided printing mode (ST37). ) Create job parameters in the single-sided printing mode (ST38), and cause the stencil printing apparatus 1 to perform the plate making operation and the printing operation in the single-sided printing mode (ST39). If the number of prints equal to or smaller than the predetermined value is set in ST33 even if the document sensor 63 is turned on in ST32, the control unit 30 automatically sets the single-sided printing mode and sets the job parameters in the single-sided printing mode. And makes the stencil printing apparatus 1 perform the plate making operation and the printing operation in the single-sided printing mode.

  According to this configuration, even if the operator forgets to press the double-sided print key 41 or does not know that the double-sided printing key 41 is pressed, and even if the double-sided printing mode is not set by performing an inappropriate operation, the number of originals and the number of printed sheets are reduced. Since double-sided printing is automatically performed as judged by the control means 30, double-sided printing can be performed automatically without the operator being aware of it, and the consumption of the master and paper P can be halved to reduce costs. Can do.

  In the first to fourth embodiments described above, the control unit 30 automatically sets the print mode according to each parameter. However, the control unit 30 automatically sets the print mode by providing a changeover switch on the operation panel 15. Whether to switch the print mode automatically, the first mode for automatically switching the print mode by the control means 30 by providing a changeover switch and whether to automatically switch the print mode by the control means 30 You may employ | adopt the structure which can select a possible 2nd aspect. According to this configuration, it is possible to select the same function as that of a conventional stencil printing apparatus, and it is possible to improve operability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic front view of a stencil printing apparatus capable of double-sided printing employing the first embodiment of the present invention. It is the schematic of the operation panel used for the 1st Embodiment of this invention. It is a block diagram of the control means used for the 1st Embodiment of this invention. It is a flowchart explaining the control in the 1st Embodiment of this invention. It is a schematic front view of the stencil printing apparatus which can perform double-sided printing which employ | adopted the 2nd Embodiment of this invention. It is a flowchart explaining the control in the 2nd Embodiment of this invention. It is a flowchart explaining the control in the 3rd Embodiment of this invention. It is a flowchart explaining the control in the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 2 Printing part 4 Paper feed part 9 Refeeding means 11 Plate cylinder 12 Pressing means (press roller)
14 divided master-making master 30 control means 42 apparatus main body 46, 47, 48 paper feed tray 61 automatic document reading device 66 external device P paper

Claims (8)

A printing cylinder having a plate cylinder rotatably supported by the apparatus main body, a printing unit having pressing means provided so as to be able to contact with and separate from the plate cylinder, a paper feeding unit having a plurality of paper feeding trays for storing paper, and one sheet Alternatively, an automatic document reader that automatically reads a plurality of documents, and refeeding that temporarily stores the paper on which the printed image is formed in the printing unit and then refeeds the printing unit A single-sided printing mode for performing printing on the basis of image information read by the automatic document reader and performing single-sided printing as a printing mode, and a surface printing step for printing a surface image on one side of the paper It is possible to switch between double-sided printing modes for performing double-sided printing for performing a backside printing process for printing a backside image on the other side of the paper after the printing has been performed. in front In the stencil printing device for winding the first plate making image and the duplex master and second perforated image took two surfaces on the plate on the cylinder with select the paper tray,
And a control unit that automatically switches the printing mode to the duplex printing mode when a plurality of documents are placed on the automatic document reading apparatus and the sheet feeding tray for duplex printing is selected. Stencil printing device. In the stencil printing apparatus according to claim 1,
It is possible to perform printing based on image information sent from a connected external device, and a plurality of image information sent from the external device or a plurality of image information sent from the external device are accumulated and double-sided. The stencil printing apparatus, wherein when the paper feed tray for printing is selected, the control means automatically switches the printing mode to the duplex printing mode. A printing cylinder having a printing cylinder rotatably supported by the apparatus main body, a printing unit having pressing means provided so as to be able to contact with and separate from the printing cylinder, and an automatic document reading apparatus that automatically reads one or a plurality of documents. A re-feeding unit that temporarily stores the paper on which the print image is formed in the printing unit and then re-feeds the paper toward the printing unit, and is read by the automatic document reader Printing is performed based on image information, and after performing a single-sided printing mode in which single-sided printing is performed as a printing mode and a front-side printing process for printing a front-side image on one side of the paper, a back-side image is printed on the other side of the paper It is possible to switch between double-sided printing modes for performing double-sided printing for performing the backside printing process. At the time of double-sided printing, a divided pre-printed master having two first and second plate-making images arranged on the plate cylinder is wound. Stencil In the printing apparatus,
The paper size used for printing can be set, and when a plurality of originals are placed on the automatic document reader and the paper size for double-sided printing is set, the control means automatically sets the print mode. A stencil printing apparatus characterized by switching to a double-sided printing mode. In the stencil printing apparatus according to claim 3,
It is possible to perform printing based on image information sent from a connected external device, and a plurality of image information sent from the external device or a plurality of image information sent from the external device are accumulated and double-sided. The stencil printing apparatus, wherein when the paper size for printing is set, the control means automatically switches the printing mode to the duplex printing mode. A printing cylinder having a printing cylinder rotatably supported by the apparatus main body, a printing unit having pressing means provided so as to be able to contact with and separate from the printing cylinder, and an automatic document reading apparatus that automatically reads one or a plurality of documents. A re-feeding unit that temporarily stores the paper on which the print image is formed in the printing unit and then re-feeds the paper toward the printing unit, and is read by the automatic document reader Printing is performed based on image information, and after performing a single-sided printing mode in which single-sided printing is performed as a printing mode and a front-side printing process for printing a front-side image on one side of the paper, a back-side image is printed on the other side of the paper It is possible to switch between double-sided printing modes for performing double-sided printing for performing the backside printing process. At the time of double-sided printing, a divided pre-printed master having two first and second plate-making images arranged on the plate cylinder is wound. Stencil to dress In the printing apparatus,
When a plurality of documents are placed on the automatic document reader and a number of printed sheets equal to or greater than a predetermined number is set, the control unit automatically switches the printing mode to the duplex printing mode. Stencil printing device. In the stencil printing apparatus according to claim 5,
Printing is possible based on image information sent from a connected external device, and a plurality of image information sent from the external device or a plurality of image information sent from the external device is stored and predetermined. The stencil printing apparatus, wherein when the number of printed sheets equal to or greater than the number is set, the control unit automatically switches the printing mode to the duplex printing mode. In the stencil printing apparatus according to any one of claims 1 to 6,
The stencil printing apparatus, wherein the control means can select whether or not to automatically switch the printing mode to the duplex printing mode. In the stencil printing apparatus according to any one of claims 1 to 6,
A first mode in which the control unit automatically switches the printing mode to the duplex printing mode, and a second mode in which the control unit can select whether to automatically switch the printing mode to the duplex printing mode. A stencil printing apparatus which is selectable.

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