JP2017185661A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stencil printer which can eliminate winding of a non-plate-making master and suppress contamination of a print sheet when performing printing by using a partial drum of a plurality of drums.SOLUTION: A stencil printer performs printing on a print sheet W conveyed along a conveyance path RC. A first stencil printing unit 4 includes: a first drum 41 which is rotationally driven around a rotational shaft 41a; a first master G1 which is wound around the first drum 41; and a first press roller 43 which presses the print sheet W to the first drum 41 at the printing. The first master G1 includes a plate-making possible area QA and a plate-making impossible area QB. A printing control unit 203, when performing printing by using only a second stencil printing unit 5, controls the first press roller 43 so as to separate from the first drum 41 and controls a rotation angle of the first drum 41 so that the plate-making impossible area QB is at a path neighboring position NP closest to a conveyance path RC.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stencil printing apparatus that prints on printing paper conveyed along a conveyance path.

  2. Description of the Related Art Conventionally, a stencil printing apparatus presses a printing paper against a drum by a press roller to transfer ink, so that the printing paper is sandwiched between the drum and the press roller and formed on a master wound around the drum. Print the image on printing paper.

  As such a stencil printing apparatus, there is known a stencil printing apparatus that includes two drums, a first drum and a second drum, around which a master is wound, and performs printing using the first and second drums. . In such a stencil printing apparatus, it is possible to perform, for example, two-color printing using both the first and second drums, or using only one of the first to second drums, For example, it is possible to perform monochrome printing.

  Here, in such a stencil printing apparatus, when printing is performed using only one drum, an unused drum that is not used for printing is wound with a non-perforated masterless master. In order to eliminate the use of the master, a stencil printing apparatus having a configuration in which the position of a press roller that is pressed during printing is separated from an unused drum to secure a passage for printing paper has been proposed (for example, see Patent Document 1).

Japanese Patent No. 4712930

  However, in the stencil printing apparatus according to Patent Document 1, although the position of the press roller is moved away, the position of the unused drum is not moved. For this reason, when the printing paper conveyed along a conveyance path | route passes an unused drum, there existed a possibility of contacting an unused drum and becoming dirty.

  The present invention has been made in view of such a situation. When printing using a part of a plurality of drums, it is not necessary to wind a plateless master, and printing paper is provided. An object of the present invention is to provide a stencil printing apparatus capable of suppressing contamination of the stencil.

  In order to achieve the above object, the first feature of the stencil printing apparatus according to the present invention includes a first stencil printing unit, a second stencil printing unit, the first stencil printing unit, and the second stencil printing unit. A stencil printing apparatus that prints on printing paper conveyed along a conveyance path, wherein the first stencil printing unit is driven to rotate about a rotation axis. A first master that is wound around the first drum and forms a plate-making image by perforation, and a first press roller that presses the printing paper against the first drum during printing, The first master wound around the first drum includes a plate making area where the plate making image can be formed and a plate making impossible area where the plate making image cannot be formed. When performing printing using only the second stencil printing unit The first press roller is controlled so as to be separated from the first drum, and the rotation angle of the first drum is controlled so that the plate-making impossible area is a position near the path closest to the transport path. is there.

  A second feature of the stencil printing apparatus according to the present invention relates to the above feature, an acquisition unit that obtains plate-making image data indicating the plate-making image, and from the plate-making possible area based on the plate-making image data, A specifying unit that specifies a blank area in which perforations constituting a plate-making image are not formed over a predetermined length; and the printing control unit conveys a predetermined number of printing sheets in printing using only the second stencil printing unit In this case, the rotation angle of the first drum is controlled so that the blank area is positioned near the path.

  A third feature of the stencil printing apparatus according to the present invention is related to the feature described above, wherein the plate making impossible area is the leading edge of the first master in the sub-scanning direction of the first master mounted on the first drum. When the printing using only the second stencil printing unit is finished, the print control unit is located on the part side, and the front end of the first master is located more than the center of the rotation shaft of the first drum. The rotation angle of the first drum is controlled so as to be on the upper side in the vertical direction.

  A fourth feature of the stencil printing apparatus according to the present invention is the above feature, wherein the printing control unit maintains the rotation angle of the first drum when printing using only the second stencil printing unit is interrupted. There is to do.

  A fifth feature of the stencil printing apparatus according to the present invention is related to the above feature, wherein the printing control unit turns off the power of the stencil printing device after printing using only the second stencil printing unit is interrupted. Alternatively, when the passage of a predetermined period is detected, the rotation angle of the first drum is controlled so that the front end portion of the first master is above the center of the rotation axis of the first drum in the vertical direction. There is.

  According to the first feature of the stencil printing apparatus of the present invention, the printing control unit controls the first press roller so as to be separated from the first drum when performing printing using only the second stencil printing unit. Therefore, the printing paper is transported through the gap between the first drum and the first press roller without being pressed against the second drum by the first press roller. This eliminates the need to wind the masterless master around the unused first drum. In addition, when performing printing using only the second stencil printing unit, the printing control unit controls the rotation angle of the first drum so that the plate making impossible area provided in the first master is located near the path. The printing paper conveyed along the conveyance path can be prevented from coming into contact with the plate making area of the first master of the first drum and ink adhering thereto.

  As described above, according to the stencil printing apparatus according to the present invention, when printing using a part of the second drums of the plurality of drums, it is not necessary to wind the masterless plate-making master, and printing is performed. It is possible to prevent the paper from becoming dirty.

  According to the second feature of the stencil printing apparatus of the present invention, the printing control unit is configured such that when a predetermined number of printing sheets are conveyed in printing using only the second stencil printing unit, the blank area becomes a position near the path. Thus, the rotation angle of the first drum is controlled. As a result, it is possible to prevent the first master from being damaged due to contact (collision) of the conveyed printing paper with the first master.

  According to the third feature of the stencil printing apparatus according to the present invention, when printing using only the second stencil printing unit is finished, the printing control unit is configured such that the leading end of the first master is rotated from the rotation shaft of the first drum. Also, the rotation angle of the first drum is controlled so as to be on the upper side in the vertical direction. Thereby, it is possible to prevent ink from leaking from the front end portion of the first master.

  According to the fourth feature of the stencil printing apparatus of the present invention, the printing control unit maintains the rotation angle of the first drum when printing using only the second stencil printing unit is interrupted. Thus, when printing using only the second stencil printing unit is resumed, it can be resumed more quickly.

  According to the fifth feature of the stencil printing apparatus according to the present invention, the printing control unit may turn off the power of the stencil printing apparatus or elapse of a predetermined period after the printing using only the second stencil printing unit is interrupted. Is detected, the rotation angle of the first drum is controlled so that the tip of the first master is above the rotation axis of the first drum in the vertical direction. As a result, when the state in which printing is not performed continues, the leading edge of the first master is moved above the center of the rotation axis of the first drum, so that ink leaks from the leading edge of the first master. Can be prevented.

1 is a schematic configuration diagram of a stencil printing apparatus according to Embodiment 1 of the present invention. It is a block diagram which shows the function of the stencil printing apparatus which concerns on Example 1 of this invention. It is explanatory drawing which shows an example of the 1st master made in the stencil printing apparatus which concerns on Example 1 of this invention. It is a flowchart which shows operation | movement of the stencil printing apparatus which concerns on Example 1 of this invention. It is a flowchart which shows operation | movement of the stencil printing apparatus which concerns on Example 1 of this invention. It is explanatory drawing which shows an example of the rotation angle of the 1st drum of the stencil printing apparatus which concerns on Example 1 of this invention. It is a flowchart which shows operation | movement of the stencil printing apparatus which concerns on Example 1 of this invention. It is explanatory drawing which shows an example of the information memorize | stored in the memory | storage part of the stencil printing apparatus which concerns on Example 2 of this invention. It is a flowchart which shows operation | movement of the stencil printing apparatus which concerns on Example 2 of this invention. It is a flowchart which shows operation | movement of the stencil printing apparatus which concerns on Example 3 of this invention. (A) It is explanatory drawing which shows an example of the rotation angle of the 1st drum of the stencil printing apparatus which concerns on Example 3 of this invention. (B) It is explanatory drawing which shows an example of the rotation angle of the 1st drum of the stencil printing apparatus which concerns on Example 3 of this invention.

  Hereinafter, a stencil printing apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. Further, the embodiments shown below exemplify devices and the like for embodying the technical idea of the present invention, and the technical idea of the present invention is to arrange the components and the like as follows. Not specific. The technical idea of the present invention can be variously modified within the scope of the claims.

[Example 1]
<Configuration of stencil printing machine>
In the first embodiment of the present invention, a two-drum stencil printing apparatus capable of two-color printing will be described as an example. FIG. 1 is a schematic configuration diagram of a stencil printing apparatus 1 provided with a printing apparatus according to a first embodiment of the present invention. Further, in the following description, as shown in FIG. 1, the top and bottom of FIG. 1 will be described as a vertical direction ZD, and the left and right of FIG.

  As shown in FIG. 1, the stencil printing apparatus 1 performs printing on a printing paper W that is transported along a transport path RC. The stencil printing apparatus 1 includes a reading unit 2, a paper feeding unit 3, a first stencil printing unit 4, a second stencil printing unit 5, a plate making unit 6, a first plate discharging unit 8, and a second plate discharging unit 9. An intermediate transport unit 10, a paper discharge unit 11, an operation panel unit 120, a number sensor unit 150, and a main body control unit 200.

  The reading unit 2 is provided in the upper part of the stencil printing apparatus 1 and reads plate-making image data from a document placed on a contact glass (not shown).

  The paper feed unit 3 includes a paper feed tray 31 on which the print paper W is stacked, a primary paper feed roll 32 that transports only the uppermost print paper W from the paper feed base 31, and the primary paper feed roll 32. A pair of secondary paper feed rolls 33 for conveying the printing paper W conveyed by the first drum 41 and the first press roller 43 in synchronization with the rotation of the first drum 41 of the first stencil printing unit 4 described later. Is provided.

  The plate making unit 6 includes a base paper storage unit 61 that stores the rolled long master G, a thermal head 62 that is disposed downstream of the base paper storage unit 61 and that heats and punches the master G, and the thermal head 62. A pair of base paper feed rolls 64 disposed downstream of the platen roll 63 and the thermal head 62, and a base paper cutter disposed downstream of the pair of base paper feed rolls 64. And plate-making is performed based on the plate-making image data read by the reading unit 2.

  Further, the plate making unit 6 is supported by a rail (not shown) so as to be movable in the X1 direction in FIG. 1, and a position for supplying the master G made to the first stencil printing unit 4 and plate making to the second stencil printing unit 5. The position where the master G is supplied can be selectively moved.

  The first plate discharging unit 8 is provided in the vicinity of the first drum 41 of the first stencil printing unit 4 to be described later, and the master G opened (discharged) from the outer peripheral surface of the first drum 41 is transferred from the first drum 41. The master G that has been peeled off and peeled off is stored in a plate removal box (not shown). The second plate removal unit 9 has the same configuration as the first plate removal unit 8.

  The first stencil printing section 4 is provided with an opening portion along the circumferential direction on the outer peripheral surface through which ink can be oozed from the inside. The first stencil printing section 4 is indicated by an arrow in FIG. Between the first drum 41, the first drum 41 that is rotationally driven in the rotation direction A about the rotation shaft 41a, the first master G1 that is wound around the first drum 41 and forms a plate-making image by perforation. The first base paper clamp unit 45 that rotates so as to grip or release the leading end of the master G and the first drum 41 are disposed below the first drum 41 and presses the printing paper W toward the first drum 41 during printing. 1 press roller 43.

  Then, the first stencil printing unit 4 clamps the tip of the first master G1 conveyed from the plate making unit 6 with the first base paper clamp unit 45, and rotates the first drum 41 in this clamped state to rotate the master G. Is wound around the outer peripheral surface of the first drum 41, and the printing paper W conveyed in synchronization with the rotation of the first drum 41 is pressed against the master G of the first drum 41 by the first press roller 43. Ink is pushed out from the perforated portion of the master G onto the printing paper W, and a plate-making image is printed on the surface of the printing paper W.

  The first stencil printing unit 4 includes a separation claw 81, a separation nozzle 82, and a separation fan 83 disposed in the vicinity of the first drum 41 on the downstream side of the sheet conveyance. The separation claw 81 is inserted between the outer peripheral surface of the first drum 41 and the leading end of the printing paper W that is conveyed while being attached thereto. As a result, the printing paper W that is attached to the outer peripheral surface of the first drum 41 and is about to rotate is forcibly separated from the outer peripheral surface of the first drum 41.

  The separation fan 83 generates separation air for separating the printing paper W from the first drum 41. Separation air generated by the separation fan 83 is blown from the separation nozzle 82 between the outer peripheral surface of the first drum 41 and the printing paper W conveyed in a state of being attached thereto. The separation fan 83 is always driven during the rotation of the first drum 41, and the separation air is used to remove the front end portion of the printing paper W from which the leading end separation air is discharged from the air nozzle provided on the separation claw 81. The whole is forcibly peeled off from the outer peripheral surface of the first drum 41.

  An image is printed when the first press roller 43 is pressed against the first drum 41, and the printing paper W peeled off from the outer peripheral surface of the first drum 41 by the separation claw 81 and the separation nozzle 82 is transferred to the intermediate conveyance unit 10. It is conveyed by.

  The intermediate transport unit 10 includes a pair of belt-hanging pulleys 101 and 101, an endless belt 102 that is hung on the pair of belt-hanging pulleys 101 and 101, and a suction that sucks the printing paper W onto the paper transport surface of the endless belt 102. A fan 103 and belt driving means (not shown) for moving the endless belt 102 are provided. The intermediate transport unit 10 receives the printing paper W peeled from the first drum 41 and feeds the received printing paper W between the second drum 51 and the second press roller 53 in synchronization with the rotation of the second drum 51. It comes to paper. Therefore, the endless belt 102 moves so that the print paper W is transported at the same speed as the transport speed of the print paper W transported by the paper feed unit 3.

  Similar to the first stencil printing unit 4, the second stencil printing unit 5 feeds the printing paper W fed from the pair of secondary paper feeding rolls 54 in synchronization with the rotation of the second drum 51 to the second press roller 53. Then, the ink is pushed out from the perforations of the second master and pressed onto the printing paper W by being pressed against the second master wound around the second drum 51.

  The second stencil printing unit 5 includes a separation claw 71, a separation nozzle 72, and a separation fan 73 that are provided in contact with the second drum 51 and are disposed in the vicinity of the second drum 51 on the downstream side of the sheet conveyance. . The configuration of the separation claw 71, the separation nozzle 72, and the separation fan 73 provided in the second stencil printing unit 5 is the same as the configuration of the separation claw 81, the separation nozzle 82, and the separation fan 83 provided in the first stencil printing unit 4. It has the same configuration.

  The paper discharge unit 11 includes a paper discharge belt 111 on which the printed print paper W is conveyed, and a paper discharge tray 112 on which the print paper W discharged from the paper discharge belt 111 is stacked.

  The operation panel unit 120 includes an operation key and a display / input panel (both not shown), and the stencil printing apparatus 1 is operated when the user presses the operation key or touches the display / input panel. Operation data including setting data regarding various settings is generated, and the generated operation data is supplied to the control unit 200.

  The number sensor unit 150 detects the printing paper W conveyed from the first stencil printing unit 4 one by one in the intermediate conveyance unit 10. Each time the printing paper W is transported, the number sensor unit 150 transmits transport data indicating that one printing paper W has been transported to the main body control unit 200.

  The main body control unit 200 performs overall control of various functions and executes a printing process for printing on printing paper. The main body control unit 200 performs one of the two drum printing processes using both the first stencil printing unit 4 and the second stencil printing unit 5, and one of the first stencil printing unit 4 and the second stencil printing unit 5. The used one-side drum printing process is executed.

  Here, FIG. 2 is a block diagram showing a functional configuration of the stencil printing apparatus 1 according to the first embodiment of the present invention.

  As illustrated in FIG. 2, the main body control unit 200 includes an acquisition unit 201, a specification unit 202, a print control unit 203, and a storage unit 204.

  The acquisition unit 201 acquires various information input to the main body control unit 200. For example, the acquisition unit 201 acquires a print job that instructs execution of print processing. The acquisition unit 201 acquires plate-making image data included in the print job. The plate making image data is data indicating a plate making image formed by punching in the first master G1 and the second master G2. The acquisition unit 201 may acquire plate-making image data read by the reading unit 2 and stored in the storage unit 204, or an external terminal (not shown) such as a personal computer connected to the stencil printing apparatus 1. The prepress image data may be acquired from the above.

  The specifying unit 202 specifies the plate making area QA and the plate making impossible area QB in the first master G1 wound around the first drum 41 and the second master G2 wound around the second drum 51. To do. The plate making area QA is an area where a plate making image can be formed by punching, and the plate making impossible area QB is an area where a plate making image cannot be formed.

  Here, FIG. 3 is a plan development view illustrating the first master G1 wound around the first drum 41. FIG. As shown in FIG. 3, the first master G1 defines a sub-scanning direction VD and a main scanning direction MD. Further, when the first master G1 is wound around the first drum 41, the sub-scanning direction VD becomes the rotation direction A of the first drum 41.

  As shown in FIG. 3, the first master G1 includes clamp areas QT1 and QT2, a plate making area QA, and a plate making impossible area QB. The second master G2 wound around the second drum 51 also includes clamp areas QT1 and QT2, a plate making area QA, and a plate making impossible area QB. Focus on the explanation.

  The clamp areas QT1 and QT2, the plate making possible area QA, and the plate making impossible area QB are partitioned in the sub-scanning direction VD and extend in a strip shape in the main scanning direction MD.

  The clamp regions QT1 and QT2 are regions clamped by the first base paper clamp unit 45. When the first master G1 is wound around the first drum 41, the front end E1 and the rear end E2 of the first master G1 are connected by a connecting member such as an adhesive tape, and the clamp region QT1 and the clamp region QT2 Are clamped by the first base paper clamp unit 45. The length of the clamp regions QT1 and QT2 in the sub-scanning direction VD is, for example, 15 mm to 20 mm.

  As shown in the example of FIG. 3, the plate making area QA is an area in which a plate making image such as a character or a figure indicated by “Z” can be formed by punching.

  The plate making impossible area QB is an area secured as a blank when the first master G1 is wound around the first drum 41. In other words, the plate making impossible area QB is paraphrased as a non-perforated area defined not to be perforated. For example, the length α of the plate making impossible area QB in the sub-scanning direction VD is 40 mm.

  When the first master G1 is wound around the first drum 41, the plate making impossible area QB is the center of the first master G1 in the sub-scanning direction VD of the first master G1 mounted on the first drum 41. It is located closer to the tip of the first master G1 than the line CL. Further, the plate making possible area QA and the plate making impossible area QB are areas defined in advance at predetermined positions in the first master G1.

  The specifying unit 202 is, for example, on the outer peripheral surface of the first drum 41 or the outer peripheral surface of the second drum 51 based on setting data input by the user using the operation panel unit 120 (for example, the front end) The rotation angle of the center line NL of the plate making possible area QA with the part E1) as an angle reference is stored in the storage unit 204.

  The printing control unit 203 controls the first stencil printing unit 4 and the second stencil printing unit 5. The printing control unit 203 controls the rotation angle of the first drum 41 by controlling the drum drive motor 48 of the first stencil printing unit 4. Further, the printing control unit 203 controls the roller drive motor 49 of the first stencil printing unit 4 to press or separate the first press roller 43 of the first stencil printing unit 4 against the first drum 41. Similarly to the first stencil printing unit 4, the printing control unit 203 controls the drum driving motor 58 and the roller driving motor 59 for the second stencil printing unit 5, thereby controlling the second drum 51 and the second press. The roller 53 is controlled.

  The storage unit 204 stores various information used for processing of the stencil printing apparatus 1.

<Operation of Stencil Printing Apparatus 1>
Next, the operation of the stencil printing apparatus 1 will be described. FIG. 4 is a flowchart showing an operation when the stencil printing apparatus 1 acquires a print job and executes a printing process.

  In step S10, in the stencil printing apparatus 1, when the acquisition unit 201 acquires a print job, the print control unit 203 determines whether to execute the one-side drum printing process based on the print job.

  In step S20, when it is determined that the one-side drum printing process is to be executed (step S10 “Yes”), the printing control unit 203 uses either the first stencil printing unit 4 or the second stencil printing unit 5. The one-side drum printing process is executed.

  On the other hand, if it is determined in step S30 that the two-drum printing process is to be executed without executing the one-sided drum printing process (step S10 “No”), the first stencil printing unit 4 and the second stencil printing unit 4 Both drum printing processes are executed using both the stencil printing unit 5.

  Next, the operation of the one-side drum printing process executed in step S20 will be specifically described. FIG. 5 is a flowchart showing an operation when the stencil printing apparatus 1 executes the one-side drum printing process. Hereinafter, a case where the one-side drum printing process is executed using only the second stencil printing unit will be described as an example.

  In step S <b> 101, when the one-side drum printing process is performed using only the second stencil printing unit, the printing control unit 203 controls the first press roller 43 and the first drum 41 in the first stencil printing unit 4. Specifically, the print control unit 203 controls the first press roller 43 so as to be separated from the first drum 41 and controls the rotation angle of the first drum 41.

  Here, FIG. 6 is a side view illustrating the first drum 41 whose rotation angle is controlled by the print control unit 203.

  In step S101, as shown in FIG. 6, the printing control unit 203 controls the rotation angle of the first drum 41 so that the plate making impossible area QB becomes the path vicinity position NP closest to the transport path RC. Specifically, first, the print control unit 203 reads the rotation angle β of the path vicinity position NP with the vertex of the first drum 41 as an angle reference from the storage unit 204. Further, the print control unit 203 reads the rotation angle (rotation position) of the center line NL of the plate making impossible area QB from the storage unit 204. Then, the printing control unit 203 controls the drum drive motor 48 to rotate the first drum 41 so that the center line NL of the plate making impossible area QB is located at the path vicinity position NP.

  Note that the print control unit 203 only needs to arrange any part of the plate making impossible area QB at the path vicinity position NP, and does not necessarily arrange the center line NL of the plate making impossible area QB at the path vicinity position NP. Good.

  In step S102, the print control unit 203 executes the one-side drum printing process using only the second stencil printing unit. At this time, the printing paper W transported along the transport path RC is in contact with the plate making impossible area QB of the first master G1 wound around the first drum 41 in the first stencil printing unit 4, It passes through the gap between the first drum 41 and the first press roller 43.

  In step S103, the print control unit 203 determines whether the one-side drum printing process corresponding to the print job is finished. If it is determined that the one-side drum printing process has been completed (step S103 “Yes”), the print control unit 203 ends the operation, and if it is determined that it has not ended (step S103 “No”), the operation of step S102 repeat.

<Action and effect>
As described above, in the stencil printing apparatus 1 according to the first embodiment of the present invention, the printing control unit 203 is separated from the first drum 41 when performing the one-side drum printing process using only the second stencil printing unit 5. Since the first press roller 43 is controlled as described above, the printing paper W passes through the gap between the first drum 41 and the first press roller 43 without being pressed against the second drum 51 by the first press roller 43. Then transported. This eliminates the need to wind the masterless master around the unused first drum 41. In addition, when performing the one-side drum printing process using only the second stencil printing unit 5, the printing control unit 203 performs the first so that the plate making impossible area QB provided in the first master G1 becomes the path vicinity position NP. Since the rotation angle of the drum 41 is controlled, the printing paper W transported along the transport path RC comes into contact with the plate making area QA of the first master G1 of the first drum 41, and ink adheres thereto. Can be suppressed.

  Thus, according to the stencil printing apparatus 1 according to the first embodiment of the present invention, when printing using a part of the second drums 51 of the plurality of drums, the winding of the masterless plate is performed. It becomes unnecessary and it can suppress that printing paper gets dirty.

[Example 2]
Next, a stencil printing apparatus 1 according to Example 2 of the present invention will be described.

  Here, in the first embodiment described above, the printing control unit 203 controls the rotation angle of the first drum 41 so that the plate making impossible area QB of the first master G1 becomes the path vicinity position NP. At this time, the printing paper W conveyed through the gap between the first drum 41 and the first press roller 43 contacts the plate making impossible area QB of the first master G1. In the stencil printing apparatus 1 according to the second embodiment, it is possible to suppress damage due to the printing paper W coming into contact with the plate making impossible area QB of the first master G1.

  FIG. 7 is a flowchart illustrating the operation of the preparation process executed by the stencil printing apparatus 1 according to the second embodiment before the one-side drum printing process.

  In step S201, in the stencil printing apparatus 1, the acquisition unit 201 acquires platemaking image data included in the print job.

  In step S202, the identifying unit 202 identifies a non-perforated area that has not been perforated from within the plate-making possible area QA based on the plate-making image data.

  Specifically, as shown in FIG. 3, the identifying unit 202 identifies a plurality of non-perforated areas QA1 to QA2 and QA4 that are not perforated in the main scanning direction MD (main scanning direction) within the plate making area QA. . At this time, the specifying unit 202 does not specify the region QA3 in which the letter “Z” is partially formed.

  In step S203, the specifying unit 202 determines whether or not there is a non-perforated region that is not perforated for a predetermined length or more in the sub-scanning direction VD (sub-scanning direction) among the plurality of non-perforated regions. For example, as illustrated in FIG. 3, the specifying unit 202 determines whether or not there is an unperforated region that is not perforated over 30 mm or more in the sub-scanning direction VD among the plurality of unperforated regions QA1 to QA2 and QA4. .

  In step S204, if the identifying unit 202 determines that there is no non-perforated area that has not been perforated for a predetermined length or more in the sub-scanning direction VD (step S203 “No”), the first wound around the first drum 41 In the master G1, it is stored in the storage unit 204 as no blank area.

  On the other hand, if it is determined in step S205 that there is a non-perforated area that is not perforated for a predetermined length or more in the sub-scanning direction VD (step S203 “Yes”), the identifying unit 202 identifies the non-perforated area as a blank area. To do. For example, as illustrated in FIG. 3, the identifying unit 202 identifies, among the plurality of non-perforated areas QA1 to QA2 and QA4, the non-perforated areas QA2 and QA4 that are not perforated over 30 mm in the sub-scanning direction VD as blank areas. To do.

  In this manner, the specifying unit 202 specifies a blank area in which the perforations constituting the plate making image are not formed over a predetermined length (for example, 30 mm) or more from the plate making possible area QA based on the plate making image data.

  In step S206, the specifying unit 202 determines the ID for identifying the non-perforated areas QA2 and QA4 specified as the blank area, the rotation angle of the center of the non-perforated areas QA2 and QA4 in the sub-scanning direction VD, and the number of printable sheets. Store it in association. For example, as illustrated in the example of FIG. 8, the specifying unit 202 stores the ID, the rotation angle, and the number of printable sheets in association with each other.

  Next, an operation when the stencil printing apparatus 1 according to the second embodiment acquires a print job and executes a printing process will be described. FIG. 9 is a flowchart illustrating the operation of the stencil printing apparatus 1 according to the second embodiment.

  The operations shown in steps S301 to S302 shown in FIG. 9 are the same as the operations in steps S101 to S102 shown in the above-described first embodiment, and thus the description thereof is omitted.

  In step S <b> 303, the print control unit 203 counts conveyance data transmitted each time the printing paper W is conveyed from the number sensor unit 150 during execution of the one-side drum printing process.

  In step S304, the print control unit 203 determines whether or not the number of conveyed sheets of the printing paper W has reached a predetermined number based on the counted conveyance data. Note that if the print control unit 203 determines that the number of transported print sheets W does not reach the predetermined number (step S304 “No”), the print control unit 203 performs the operation of step S302.

  On the other hand, in step S305, when the print control unit 203 determines that the number of transported print sheets W has reached a predetermined number (for example, 4000) (step S304 “Yes”), a blank area is stored in the storage unit 204. It is determined whether or not it has been done. If the print control unit 203 determines that no blank area is stored in the storage unit 204 (“No” in step S304), the print control unit 203 performs the operation in step S307.

  On the other hand, in step S306, when the print control unit 203 determines that the blank area is stored in the storage unit 204 (step S304 "Yes"), the first drum 41 is set so that the blank area becomes the path vicinity position NP. Control the rotation angle. For example, the print control unit 203 sets the rotation angle of the first drum 41 so that the rotation angle of the center line in the sub-scanning direction VD of the non-perforated area QA2 specified as the blank area becomes the rotation angle of the path vicinity position NP. Control.

  In step S307, the print control unit 203 determines whether the one-side drum printing process corresponding to the print job is finished. If the print control unit 203 determines that the one-side drum printing process has ended (step S307 “Yes”), the print control unit 203 ends the operation, and if it determines that the one-side drum printing process has not ended (step S307 “No”), the operation of step S302. repeat.

  As described above, in the stencil printing apparatus 1 according to the second embodiment, the printing control unit 203 causes the blank area to be printed when a predetermined number of printing sheets W are conveyed in the one-side drum printing process using only the second stencil printing unit 5. The rotation angle of the first drum 41 is controlled so that becomes the path vicinity position NP. Thereby, it can suppress that the 1st master G1 is damaged resulting from the printing paper W conveyed contacting the 1st master G1 (collision).

  Further, in the first master G1 wound around the first drum 41, the blank area is located behind the sub-scanning direction VD, that is, behind the rotation direction A with respect to the plate making impossible area QB. For this reason, the printing control unit 203 moves more along the rotation direction A when moving from the state where the plate making impossible area QB is arranged at the path vicinity position NP to the state where the blank area is arranged at the path vicinity position NP. Can move efficiently.

  Further, the stencil printing apparatus 1 according to the first embodiment separately includes a drum drive motor 48 that rotationally drives the first drum 41 and a drum drive motor 58 that rotationally drives the second drum 51. Accordingly, the print control unit 203 can control the rotation angle of the first drum 41 by controlling the drum drive motor 48 even when the one-side drum printing process is being executed. Therefore, the print control unit 203 does not need to stop the one-side drum printing process when controlling the rotation angle of the first drum 41 so that the blank area becomes the path vicinity position NP. Can be suppressed.

[Example 3]
Next, a stencil printing apparatus 1 according to Example 3 of the present invention will be described.

  Here, in the above-described first embodiment, the printing control unit 203 sets the rotation angle of the first drum 41 so that the plate making impossible area QB of the first master G1 becomes the path vicinity position NP in the one-side drum printing process. I was in control. At this time, the plate making possible area QA is arranged below the center C of the rotation shaft 41a of the first drum 41 in the vertical direction ZD. Further, the plate making impossible area QB is located closer to the tip E1 side of the first master G1 than the center line CL of the first master G1 in the sub-scanning direction VD of the first master G1 mounted on the first drum 41. Therefore, the tip E1 is also disposed below the center C of the rotation shaft 41a of the first drum 41 in the vertical direction ZD.

  In the stencil printing apparatus 1 according to the third embodiment, the leading end E1 is disposed below the center C of the rotation shaft 41a of the first drum 41 in the vertical direction ZD, so that the first drum 41 is supplied. It is possible to prevent leaked ink from leaking from the tip E1.

  Next, an operation when the stencil printing apparatus 1 according to the third embodiment acquires a print job and executes a printing process will be described. FIG. 10 is a flowchart illustrating the operation of the stencil printing apparatus 1 according to the third embodiment.

  Note that the operations shown in steps S401 to S402 shown in FIG. 10 are the same as the operations in steps S101 to S102 shown in the first embodiment described above, and thus the description thereof is omitted.

  In step S403, the print control unit 203 determines whether the one-side drum printing process corresponding to the print job is finished.

  In step S404, if the print control unit 203 determines that the one-side drum printing process has been completed (step S403 “Yes”), the leading end E1 of the first master G1 is positioned from the center C of the rotation shaft 41a of the first drum 41. Also, the rotation angle of the first drum 41 is controlled so as to be on the upper side in the vertical direction ZD.

  For example, as shown in FIG. 11A, the printing control unit 203, when the plate making impossible area QB of the first master G1 is arranged at the path vicinity position NP, the rotation angle of the tip E1 with the vertex as an angle reference Arranged at γ1. In step S404, the printing control unit 203 moves the top end E1 of the first master G1 in the vertical direction from the horizontal line HL passing through the center C of the rotation shaft 41a of the first drum 41, as shown in FIG. The tip E1 is arranged at the rotation angle γ2 so as to be on the upper side in ZD.

  On the other hand, if the print control unit 203 determines in step S405 that the one-side drum printing process has not ended (step S403 “No”), the print control unit 203 determines whether the one-side drum printing process is interrupted. For example, the print control unit 203 determines whether or not the one-side drum printing process is interrupted by detecting whether or not a pause button is input by the user using the operation panel unit 120. If the print control unit 203 determines that the one-side drum printing process is not interrupted (step S405 “No”), it performs the operation of step S402.

  On the other hand, if the print control unit 203 determines in step S406 that the one-side drum printing process has been interrupted (step S405 “Yes”), the rotation angle of the first drum 41 is maintained. Specifically, the print control unit 203 maintains a state in which the plate making impossible area QB of the first master G1 is arranged at the path vicinity position NP.

  In step S407, the print control unit 203 determines whether the one-side drum printing process has been resumed. For example, the print control unit 203 determines whether or not the one-side drum printing process has been resumed by detecting whether or not a resume button has been input by the user using the operation panel unit 120. Note that if the print control unit 203 determines that the one-side drum printing process has been resumed (step S407 “Yes”), the print control unit 203 performs the operation of step S402.

  On the other hand, if it is determined in step S408 that the one-side drum printing process has not been resumed (step S407 “No”), a predetermined period (for example, 1 minute) after the one-side drum printing process is interrupted. It is determined whether or not the passage of time has been detected.

  For example, the printing control unit 203 starts a timer at the timing when the one-side drum printing process is interrupted, and measures the interruption time. Then, the printing control unit 203 detects the elapse of the predetermined period when the interruption time has elapsed for the predetermined period.

  The print control unit 203 then performs the operation of step S404 when the passage of the predetermined period is detected after the one-side drum printing process is interrupted (step S408 “Yes”). In other words, the print control unit 203 controls the rotation angle of the first drum 41 so that the front end E1 of the first master G1 is above the center C of the rotation shaft 41a of the first drum 41 in the vertical direction ZD. .

  On the other hand, when the elapse of the predetermined period is not detected (step S408 “No”), the print control unit 203 repeats the operation of step S406.

  As described above, in the stencil printing apparatus 1 according to the third embodiment, when the one-side drum printing process is completed, the printing control unit 203 has the tip E1 of the first drum 41 more than the rotation shaft 41a of the first drum 41. The rotation angle of the first drum 41 is controlled so as to be on the upper side in the vertical direction ZD. Thereby, it is possible to prevent the ink from leaking from the front end E1 of the first master G1.

  According to the stencil printing apparatus 1 according to the third embodiment, the printing control unit 203 maintains the rotation angle of the first master G1 when the one-side drum printing process is interrupted. As a result, when the one-side drum printing process is resumed, it can be resumed more quickly.

  According to the stencil printing apparatus 1 according to the third embodiment, when the printing control unit 203 detects the elapse of a predetermined period after the one-side drum printing process is interrupted, the leading end E1 of the first drum 41 is the first drum 41. The rotation angle of the first drum 41 is controlled so as to be above the rotation axis 41a in the vertical direction ZD. As a result, when the state in which printing is not performed continues for a predetermined period, the leading end E1 of the first master G1 is moved above the center C of the rotation shaft 41a of the first drum 41. Ink can be prevented from leaking from the tip E1.

  When the horizontal line HL passing through the center C of the rotation shaft 41a of the first drum 41 is set to 0 °, the print control unit 203 rotates the front end E1 of the first master G1 to the apex side by 45 ° or more from the horizontal line HL. More preferably. Thereby, it can prevent more reliably that ink leaks from the front-end | tip part E1 of the 1st master G1.

  In the stencil printing apparatus 1 according to the third embodiment described above, it is determined in step S408 whether or not the passage of a predetermined period is detected after the one-side drum printing process is interrupted. However, the present invention is not limited to this. It is not a thing. For example, in step S408, the print control unit 203 may determine whether or not the stencil printing apparatus 1 has been turned off after the one-side drum printing process is interrupted. Then, the printing control unit 203 performs the operation of step S404 when the power-off of the stencil printing apparatus 1 is detected, and performs the operation of step S406 when the power-off of the stencil printing apparatus 1 is not detected. Also good. The print control unit 203 determines whether or not the power-off button of the stencil printing apparatus 1 has been detected by determining whether or not a power-off button has been input by the user using the operation panel unit 120. May be.

[Other Embodiments of the Present Invention]
Although the present invention has been described in detail using the above-described embodiments, it is obvious for those skilled in the art that the present invention is not limited to the embodiments described herein.

  For example, in the above-described embodiment, the case where the one-side drum printing process is a printing process using the second drum 51 of the second stencil printing unit 5 has been described as an example. Printing processing using one drum 41 may be used. In this case, in the main body control unit 200, the control performed by the specifying unit 202 and the print control unit 203 on the first stencil printing unit 4 is performed on the second stencil printing unit 5.

  Further, for example, in the stencil printing apparatus 1 according to the above-described embodiment, the drum drive motor 48 that rotates the first drum 41 and the drum drive motor 58 that rotates the second drum 51 are provided. The drive motor 48 and the drum drive motor 58 may be configured by a single drum drive motor. In this case, the stencil printing apparatus 1 includes a switching mechanism that selectively applies a driving force of a single drum driving motor to one or both of the first drum 41 and the second drum 51.

  Further, for example, in the above-described embodiment, the stencil printing apparatus 1 includes two stencil printing units including a first stencil printing unit 4 including the first drum 41 and a second stencil printing unit 5 including the second drum 51. Although a configuration that can perform two-color printing has been described as an example, a configuration that includes three or more stencil printing units and that can perform printing of three or more colors may be used. In this case, the control executed for the first stencil printing unit 4 is executed for the stencil printing unit including an unused drum that is not used.

  As described above, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiment.

DESCRIPTION OF SYMBOLS 1 ... Stencil printing apparatus 2 ... Reading part 3 ... Paper feed part 4 ... 1st stencil printing part 5 ... 2nd stencil printing part 6 ... Plate making part 8 ... 1st discharging part 9 ... 2nd discharging part 10 ... Intermediate conveyance part 11 Sheet discharge unit 41 First drum 41a Rotating shaft 43 First press roller 51 Second drum 53 Second press roller 120 Operation panel unit 150 Number sensor unit 200 Main body control unit 201 Acquisition unit 202 ... specification part 203 ... printing control part 204 ... storage part A ... rotation direction G1 ... first master G2 ... second master NP ... path vicinity position QA ... plate making area QB ... plate making impossible area RC ... conveying path

Claims (5)

A first stencil printing unit;
A second stencil printing section;
A stencil printing apparatus comprising: a printing control unit that controls the first stencil printing unit and the second stencil printing unit; and printing on printing paper conveyed along a conveyance path,
The first stencil printing unit includes:
A first drum that is driven to rotate about a rotation axis;
A first master wound around the first drum and forming a plate-making image by perforation;
A first press roller that presses the printing paper against the first drum during printing,
The first master wound around the first drum is
A plate making area where the plate making image can be formed;
A plate-making impossible area where the plate-making image cannot be formed, and
When printing using only the second stencil printing unit, the printing control unit controls the first press roller so as to be separated from the first drum, and the plate making impossible region is the transport path. A stencil printing apparatus, wherein the rotation angle of the first drum is controlled so as to be in the vicinity of the path near the path. An acquisition unit for acquiring plate-making image data indicating the plate-making image;
Based on the plate-making image data, a specifying unit for specifying a blank area in which the perforations constituting the plate-making image are not formed over a predetermined length from within the plate-making possible area,
The printing control unit controls a rotation angle of the first drum so that the blank area is positioned in the vicinity of the path when a predetermined number of the printing sheets are conveyed in printing using only the second stencil printing unit. The stencil printing apparatus according to claim 1. The plate making impossible area is located on the tip side of the first master in the sub-scanning direction of the first master mounted on the first drum,
When the printing using only the second stencil printing unit is completed, the printing control unit is configured such that the tip of the first master is above the center of the rotation shaft of the first drum in the vertical direction. The stencil printing apparatus according to claim 1, wherein a rotation angle of the first drum is controlled. The stencil printing apparatus according to claim 3, wherein the printing control unit maintains a rotation angle of the first drum when printing using only the second stencil printing unit is interrupted. When the printing control unit detects that the stencil printing apparatus is turned off or a predetermined period has elapsed after printing using only the second stencil printing unit is interrupted, the leading end of the first master is 5. The stencil printing apparatus according to claim 4, wherein the rotation angle of the first drum is controlled to be above the center of the rotation axis of the first drum in the vertical direction.

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