JP2009286080A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer capable of improving operability in initialization and eliminating the waste of resources while reducing cost. <P>SOLUTION: The printer has: a printing cylinder 9 attachable to and detachable from a printer body 8; an openable/closable master holding means 91 provided on the outer peripheral surface of the printing cylinder to hold a master 29; and a clamper opening/closing means 92 opening/closing a clamper provided at the master holding means in a predetermined position. In factory shipment, a control means 60 controls the operation of the clamper opening/closing means 92 to open the clamper 18 when the printing cylinder 9 is mounted on the printer body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printing apparatus that holds a master on an outer peripheral surface of a plate cylinder by a master holding unit, and relates to opening / closing control of a clamper constituting the master holding unit.

In a stencil printing apparatus, which is a printing apparatus provided with a plate making apparatus in the apparatus main body, one end of the master made by the plate making apparatus is held by a master holding means provided on a porous cylindrical plate cylinder, thereby being formed on the outer surface of the plate cylinder. When the master is wound and the paper is pressed against the outer peripheral surface of the plate cylinder by the pressing means, the ink supplied to the inner peripheral surface of the plate cylinder is exuded from the opening portion of the plate cylinder and the master perforation portion, and this ink is transferred to the paper. By doing so, a printed image is obtained on the paper. In such a stencil printing apparatus, the plate cylinder is unitized and is detachable from the apparatus main body.
The master holding means includes a magnetic stage provided on the outer peripheral surface of the plate cylinder and a metal clamper that can be opened and closed with respect to the stage, and the clamper is attracted to the upper surface of the stage by the magnetic force of the stage. The master is held between the stage and the clamper.
In the master holding means, when the master clamping force (clamping force) is insufficient, the master is wrinkled or misaligned from an appropriate position, and a problem that a predetermined image cannot be obtained occurs. Various proposals have been made.

JP 2004-2495503 A

Such measures prevent wrinkles and misalignment from the proper position on the master, but since the master clamping force (clamping force) is proportional to the strength of the magnetic material, a magnetic material with a strong magnetizing force is generally used. Used on stage. For this reason, when a state in which there is no master between the stage having the magnetizing force and the clamper continues for a long period of time, the clamp may be unable to open and close because the stage surface sucks the clamper by an action like a suction cup. When using a printing device, the master is sandwiched between the stage and the clamper, so this problem does not occur, but at the time of shipment from the factory, the master is not sandwiched between the stage and the clamper. Is likely to occur. To prevent such a problem, a sheet is sandwiched between the stage and the clamper at the time of factory shipment.
However, if a sheet is sandwiched between the stage and the clamper, an operation for removing the sheet occurs before using the printing apparatus, which impairs the operability at the time of initial setting of the apparatus. Further, since the removed paper is discarded, resources are wasted. Since the paper between the stage and the clamper is cut to fit the size of the clamper, the cost and management of the paper are generated.
SUMMARY OF THE INVENTION An object of the present invention is to propose a printing apparatus capable of reducing the cost and eliminating waste of resources and improving operability at the time of initial setting.

  In order to achieve the above object, a plate cylinder detachably attached to the apparatus main body, an openable / closable master holding means provided on an outer peripheral surface of the plate cylinder, and a clamper provided in the master holding means at a predetermined position. In the printing apparatus according to the present invention having the clamper opening and closing means for opening and closing, the control for controlling the operation of the clamper opening and closing means so that the clamper is opened when the plate cylinder is mounted on the apparatus body at the time of factory shipment. It has the means.

  In the printing apparatus according to the present invention, when the master is not wound on the outer peripheral surface of the plate cylinder, the operation of the clamper opening / closing means is controlled so that the clamper is in the open state. That is, it has storage means for storing information on whether or not the master is wound on the outer peripheral surface of the plate cylinder, and when the information on which the master is wound is not stored in the storage means, the clamper The operation of the clamper opening / closing means is controlled by the control means so as to be in the open state. Alternatively, it has master detection means for detecting whether or not the master is wound around the outer peripheral surface of the plate cylinder, and when the master detection means does not detect that the master is wound, the clamper is in an open state. Therefore, the operation of the clamper opening / closing means is controlled by the control means.

  In the printing apparatus according to the present invention, when the clamper is further in an unlocked state in which the plate cylinder can be detached from the apparatus main body and in a locked state in which the plate cylinder cannot be detached from the apparatus main body, and the clamper is in the open state The operation of the lock means is controlled by the control means so as to be in a locked state.

  The printing apparatus having such a lock unit has a release information input unit for inputting various types of release information, and the control unit closes the clamper based on the release command input from the release information input unit. The operation of the clamper opening / closing means is controlled, and the operation of the lock means is controlled so as to be in the released state.

In the case of having a release information input means, when there is a measuring means for measuring the elapsed time since the release command is input from the release information input means, and the elapsed time measured by the measuring means has passed a preset transition time In this case, the operation of the clamper opening / closing means is controlled by the control means so that the clamper is in an open state, and the operation of the lock means is controlled so as to be in a locked state regardless of the presence or absence of a release command.
Further, the printing apparatus having the measuring means has setting means for inputting the transition time, and the transition time preset in the control means is changed to the transition time input from the setting means.

  When there is a command to turn off the apparatus power while the clamper opening / closing means is operating so that the clamper is in the open state or the lock means is operating so that the clamper is in the locked state in the printing apparatus having the lock means Further, it is characterized in that it has circuit means for cutting off power supply to the apparatus main body after the operation of the clamper opening / closing means is stopped to the open state and after the operation of the lock means to the locked state is stopped.

  The printing apparatus according to the present invention includes a display unit that displays the state of the apparatus, and the control unit controls the display unit to display the state of the clamper or the state of the lock unit.

According to the present invention, when the plate cylinder is mounted on the apparatus main body, the operation of the clamper opening / closing means is controlled so that the clamper is opened, so that it is not necessary to sandwich the sheet between the stage and the clamper. Therefore, it is possible to improve the operability at the time of initial setting by eliminating waste of resources while reducing costs.
According to the present invention, when the master is not wound on the outer peripheral surface of the plate cylinder, the operation of the clamper opening / closing means is controlled so that the clamper is in an open state. The clamper can be opened stably without any trouble.

  Hereinafter, embodiments of the present invention will be described in order with reference to the drawings. FIG. 1 shows a stencil printing apparatus 1 as a printing apparatus to which the present invention is applied. 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 control means 60, and the like.

  The printing unit 2 disposed almost at the center of the apparatus main body 8 includes a plate cylinder 9 and a press roller 10. The plate cylinder 9 is rotatably supported by a support shaft 11 that also serves as an ink supply pipe, and is driven to rotate by a plate cylinder driving unit (not shown). An ink supply means 14 having an ink roller 12, a doctor roller 13, etc. is disposed inside the plate cylinder 9, and an ink reservoir having a wedge-shaped cross section formed in the vicinity of the ink roller 12 and the doctor roller 13. Fifteen inks are supplied to the inner peripheral surface of the plate cylinder 9. The plate cylinder 9 is configured as a drum unit 90 as shown in FIG. 2, and the drum knit is detachable from the apparatus main body 8. As shown in FIG. 4, the drum unit 90 includes storage means 95 that stores information on whether or not the master 29 is wound around the outer peripheral surface of the plate cylinder 9.

  As shown in FIG. 3, the plate cylinder 9 is provided with master holding means 91 on a part of the outer peripheral surface thereof. The master holding means 91 includes a stage portion 16 having a magnetic force and a metal clamper 18. A bracket 17 is attached on the stage portion 16. A support shaft 18a of a clamper 18 is rotatably attached to the bracket 17, and the clamper 18 is supported by the support shaft 18a so as to be openable and closable with respect to the stage portion 16. The clamper 18 is configured to open and close at the plate supply position and the plate discharge position by a clamper opening / closing means 92 (not shown) when the plate cylinder 9 occupies the plate discharge position and the plate supply position. As the clamper opening / closing means 92, for example, the clamper lever 20 is provided on the support shaft 18a, and the lever 20 is driven by a drive motor or the like (not shown) at the plate supply position and the plate release position to push up and hold the clamper 18 in an open state. It is well known. Alternatively, a drive motor may be connected to the support shaft 18a to open and close the clamper 18 at the plate feeding position and the plate discharging position. In these cases, each drive motor becomes the clamp drive means 93.

  In the apparatus main body 8, there are provided lock means 94 for releasing the drum unit 90 from the apparatus main body 8 and allowing the drum unit 90 to be detached from the apparatus main body 8. The lock means 94 has a hook portion that can be engaged / disengaged in a part of the drum unit 90 attached to the apparatus main body 8 and a drive means for driving the hook. The drive means is operated by the control means 60. This is a known configuration for switching the hook between the engagement position and the disengagement position.

  Below the plate cylinder 9 is disposed a press roller 10 serving as a printing pressure member in which both ends of the support shaft are rotatably supported by a pair of arm members 22. The press roller 10 is swung by a swinging means (not shown) so that the press roller 10 is separated from the outer peripheral surface of the plate cylinder 9 shown in FIG. It selectively occupies the press-contact position pressed by force.

  A plate making unit 3 is disposed in the upper right part of the apparatus main body 8. The plate making unit 3 includes a master holding member 23, a platen roller 24, a thermal head 25, a master cutting means 26, a master conveying roller pair 27, 28, and the like. The master holding member 23 is attached to a side plate (not shown) of the apparatus main body 8 and rotates a core portion of a master roll 29a obtained by winding a master 29 formed by laminating a thermoplastic resin film and a porous support in a roll shape. Support freely and detachable.

  A platen roller 24 disposed on the left side of the master holding member 23 is rotatably supported on a side plate (not shown) of the apparatus body 8 and is driven to rotate by a stepping motor 30. A thermal head 25 having a large number of heat generating elements located below the platen roller 24 is attached to a side plate (not shown) of the apparatus body 8, and the surface of the heat generating element is arranged around the platen roller 24 by a biasing force of a biasing means (not shown). It is pressed against the surface. The thermal head 25 selectively heats each heating element while contacting the surface of the thermoplastic resin film of the master 29, and performs hot melt perforation plate-making on the master 29.

  Master cutting means 26 is disposed on the left side of the platen roller 24 and the thermal head 25. The master cutting means 26 having a fixed blade fixed to a frame (not shown) of the apparatus main body 8 and a movable blade supported so as to be movable with respect to the fixed blade has the movable blade rotated or moved with respect to the fixed blade. The master 29 is cut by moving up and down.

  On the left side of the master cutting means 26, a master transport roller pair 27, 28 is disposed. Each of the master conveying roller pairs 27 and 28 has a driving roller and a driven roller that are rotatably supported by a side plate (not shown) of the apparatus main body 8, and each driving roller is a platen roller 24 by driving means (not shown). The driven rollers are rotationally driven in the same direction in synchronism with each other, and the driven rollers are pressed against the corresponding driving rollers by urging means (not shown).

  A sheet feeding unit 4 is disposed below the plate making unit 3. The paper feed unit 4 includes a paper feed tray 31, a paper feed roller 32, a separation roller pair 33, a registration roller pair 34, and the like.

  A paper feed tray 31 on which a large number of sheets P can be stacked on the upper surface is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by elevating means (not shown). A pair of side fences 35 are disposed on the upper surface of the paper feed tray 31, and each side fence 35 is configured to be able to contact and separate in synchronization with each other by a known rack and pinion mechanism.

  A paper feed roller 32 having a high friction resistance member on the surface is disposed above the left end of the paper feed tray 31. The paper feed roller 32 is rotatably supported by a bracket (not shown) that is swingably supported by the apparatus body 8, and the uppermost position on the paper feed tray 31 with a predetermined pressing force when the paper feed tray 31 is raised. The sheet P. The paper feed roller 32 is rotationally driven by a stepping motor 36.

  A separation roller pair 33 is disposed on the left side of the paper feed roller 32. The separation roller pair 33 has an upper roller and a lower roller each having a high friction resistance member on the surface, and the upper roller is rotated in the same direction in synchronization with the feeding roller 32 by the stepping motor 36. Driven. The lower roller is pressed against the upper roller with a predetermined pressing force by a biasing force of a biasing means (not shown), and is configured to be rotatable only in the same direction as the upper roller.

  On the left side of the separation roller pair 33, a registration roller pair 34 having a driving roller 34a and a driven roller 34b is disposed. The driving roller 34a is rotatably supported between side plates (not shown) of the apparatus main body 8, and a rotational driving force from a plate cylinder driving means (not shown) is transmitted through a driving force transmission means (not shown), thereby the plate cylinder. 9 is driven in rotation. The driven roller 34b is rotatably supported between side plates (not shown) of the apparatus body 8, and is pressed against the drive roller 34a with a predetermined pressing force by a biasing force of a biasing means (not shown).

  A plate discharging unit 5 is disposed on the upper left side of the printing unit 2. The plate removal unit 5 includes an upper plate removal member 37, a lower plate removal member 38, a plate removal box 39, a compression plate 40, and the like. Each of the upper plate removing member 37 and the lower plate discharging member 38 has a driving roller, a driven roller, an endless belt, and the like, and the endless belt moves when the driving roller is rotationally driven by a plate driving means (not shown). Further, the lower plate discharging member 38 is configured to be movable by a moving means (not shown), and selectively occupies the initial position shown in the drawing and the peeling position where the endless belt contacts the outer peripheral surface of the plate cylinder 9.

  A plate removal box 39 for storing a used master therein is configured to be detachable from the apparatus main body 8. A compression plate 40 that pushes the used master carried by the upper plate release member 37 and the lower plate release member 38 into the plate release box 39 is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown). The

  A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 41, a paper transport unit 42, a paper discharge tray 43, and the like. The base end of the peeling claw 41 is swingably supported by the apparatus main body 8 and is swung by a claw swinging means (not shown) so that the free end formed in an acute angle is the outer periphery of the plate cylinder 9. The proximity position shown in the drawing close to the surface and the separation position separated from the outer peripheral surface of the plate cylinder 9 to avoid obstacles such as the clamper 18 are selectively occupied.

  The sheet conveying means 42 disposed on the lower left side of the peeling claw 41 has a driving roller, a driven roller, an endless belt, a suction fan, and the like. The paper conveying means 42 is configured to remove the printed paper P peeled off from the outer peripheral surface of the plate cylinder 9 by the peeling claw 41 when the driving roller is rotated by a paper discharge driving means (not shown) and the suction fan is operated. Conveys to the left while sucking on the endless belt.

  A paper discharge tray 43 is disposed on the left side of the paper conveying means 42. A paper discharge tray 43 on which a large number of printed paper P transported by the paper transport means 42 is stacked has one end fence 44 and a pair of side fences 45 for aligning the paper P on the upper surface thereof. ing. The end fence 44 is movable in the same direction as the paper transport direction, and the side fences 45 are configured to be able to contact and separate from each other in the same direction as the paper width direction.

  An image reading unit 7 is disposed on the upper part of the apparatus main body 8. The image reading unit 7 includes a contact glass 46 on which a document is placed, a pressure plate 47 that can be moved toward and away from the contact glass 46, a scanning unit 48 that scans and reads a document image, a lens 49 that focuses the scanned image, and a focus. And an image sensor 50 such as a CCD for processing the processed image. An ADF unit 51 used for automatically and continuously reading a plurality of originals is disposed above the pressure plate 47.

  FIG. 4 shows a configuration of a control system according to the present invention. Inside the apparatus main body 8 is disposed a control means 60 composed of a well-known microcomputer having a main control board 61 having a CPU (not shown), a ROM 62, a RAM 63, and the like. The main control plate 61 is supplied with operation signals from an operation panel 64 provided on the upper front surface of the apparatus main body 8 and detection signals from various sensors 65, and is connected to various loads 66 such as motors of respective parts. The operations of the printing unit 2, plate making unit 3, paper feeding unit 4, plate discharging unit 5, paper discharge unit 6, and image reading unit 7 are controlled based on the respective signals. The operation panel 64 is provided with release information input means 641 for inputting various release information, and a display unit 642 for displaying the state of the apparatus.

  Master drive means 93 and lock means 94 of master opening / closing means 92 are connected to the main control plate 61. The main control plate 61 can communicate with the storage means 95 when the drum unit 90 is attached to the apparatus main body 8.

  In the vicinity of the mounting portion of the drum unit 90 of the apparatus main body 8, known master detecting means 96 for optically detecting whether or not the master is wound around the outer peripheral surface of the plate cylinder 9 is disposed. The master detection means 96 is connected to the main control board 61 and outputs master presence / absence information to the main control board 61.

The basic operation of the stencil printing apparatus 1 having such a configuration and the operation unique to the present application will be described.
After an original is placed on the contact glass 46 by the operator, when a plate making start key (not shown) on the operation panel is pressed with the pressure plate 47 closed, the image reading unit 7 reads the original image. . The image is read by scanning the document image with the scanning unit 48, and the read image is focused by the lens 49 and then sent to the image sensor 50.

  In parallel with the image reading operation, the plate discharging unit 5 performs a plate discharging operation for peeling the used master from the outer peripheral surface of the plate cylinder 9. When the plate making start key is pressed, the plate cylinder 9 starts to rotate, and when the plate cylinder 9 reaches a predetermined plate discharging position, the rotation is stopped. Thereafter, the driving means 93 of the master opening / closing means 92 is operated to release the clamper 18. Then, the lower plate discharging member 38 is actuated and moved to the peeling position. After the used master on the plate cylinder 9 is scooped up by the lower plate discharging member 38, the plate cylinder 9 is driven to rotate and the upper plate discharging member 37 is moved. In operation, the used master on the plate cylinder 9 is transported by the plate discharging members 37 and 38 and stored in the plate discharging box 39. Thereafter, the compression plate 40 is operated to compress the used master in the discharge plate box 39, and the plate cylinder 9 is rotated to a predetermined plate feeding position and stopped, the clamper 18 is opened, and the stencil printing apparatus 1 is It will be in the waiting state for the plate feed.

  When the stencil printing apparatus 1 enters the plate feeding standby state, the platen roller 24 and each of the master transport roller pairs 27 and 28 are driven to rotate, and the master 29 is pulled out from the master roll 29a. The drawn master 29 is perforated according to the image data when passing through the thermal head 25, and a plate-making image is formed on the surface of the thermoplastic resin film. The master 29 is sent to the clamper 18 while making a plate, and when the control means 52 determines that the tip of the master 29 has been conveyed to a position that can be held by the clamper 18 based on the number of steps of the stepping motor 30, the clamper 18 is closed and the plate is made. The leading end of the master 29 is held on the outer peripheral surface of the plate cylinder 9.

  Thereafter, the plate cylinder 9 is rotationally driven at the same peripheral speed as the conveying speed of the master 29, and the winding operation of the master 29 around the plate cylinder 9 is performed. During this winding operation, the master 29 having its tip end sandwiched between the clamper 18 and the stage portion 16 is wound on the outer peripheral surface of the plate cylinder 9. When the master 28 for one plate is made, the operations of the platen roller 24 and each of the master transport roller pairs 27 and 28 are stopped and the master cutting means 26 is operated to cut the master 29. The cut master 29 is pulled out from the plate making unit 3 by the rotation of the plate cylinder 9, and the plate cylinder 9 rotates to the home position and stops, whereby the plate making operation and the plate feeding operation are completed.

  When the plate feeding operation is completed, the plate cylinder 9 starts to rotate in the clockwise direction in FIG. 1 at a low speed, and the sheet feeding unit 4 operates to pull out the uppermost sheet P from the sheet feeding tray 31. It is. After the drawn paper P is temporarily stopped by the registration roller pair 34, the image area leading end in the plate cylinder rotation direction of the master 29 wound around the plate cylinder 9 reaches a contact portion with the press roller 10. When the drive roller 34a is rotationally driven at the timing, it is fed toward the contact portion between the plate cylinder 9 and the press roller 10.

  Almost simultaneously with the rotation of the drive roller 34a, the press roller 10 occupies the pressure contact position by the operation of the swinging means (not shown), and the fed paper P is pressed against the master 29 on the plate cylinder 9. By this pressing operation, the press roller 10, the paper P, the master 29, and the plate cylinder 9 are pressed against each other, and the ink supplied to the inner peripheral surface of the plate cylinder 9 by the ink roller 12 oozes out from a plate cylinder opening portion (not shown). After the porous support of the master 29 is filled, it is transferred to the paper P through the perforated portion of the master 29, and so-called printing is performed.

  The sheet P on which the image has been transferred by printing is peeled off from the outer peripheral surface of the plate cylinder 9 by the peeling claw 41, dropped downward and sent to the sheet conveying means 42, and then sucked and conveyed by the sheet conveying means 42. Then, the paper is discharged onto the paper discharge tray 43. Thereafter, the plate cylinder 9 rotates again to the home position and stops, and the stencil printing apparatus 1 enters a printing standby state after finishing the plate attaching operation.

  When the printing start key (not shown) is pressed after the printing conditions and the number of prints are input by the keys on the operation panel 64 after the stencil printing apparatus 1 enters the print standby state, the printing speed set at the plate cylinder 9 is set. And the sheet P is continuously fed from the sheet feeding unit 4 to perform a printing operation. When the set number of prints is consumed, the plate cylinder 9 stops at the home position, and the stencil printing apparatus 1 enters the print standby state again.

Next, characteristic operations of the present invention will be described.
(First embodiment)
The control means 60 has a function of controlling a series of operations from the above plate making to printing, and when the drum unit 90 is mounted on the apparatus main body 8 and the master is wound, the master winding information is recorded as history information. And a function for controlling the operation of the clamp driving means 93 of the clamper opening / closing means 92 so that the clamper 18 is opened when the information about the master wound in the storage means 95 is not stored. The clamper 18 is closed based on the function of controlling the operation of the lock means 94 so as to be locked when the clamper 18 is in the open state and the release command input from the release information input means 641. Function of controlling the operation of the clamp driving means 93 of the clamper opening / closing means 92 and controlling the operation of the locking means 94 so as to be in the released state. The function of displaying the state of the clamper 18 and the state of the lock means 94 on the display unit 642 and the master detecting means 96 are not detected that the master is wound so that the clamper 18 is opened. A function of controlling the operation of the clamp driving means 93 of the clamper opening / closing means 92 is provided. The case where the information on which the master is wound is not stored in the storage means 95 includes, for example, the case where the stencil printing apparatus 1 is shipped from the factory, and this case is referred to as “at the time of factory shipment”.

  Hereafter, the function of the control means 60 is demonstrated along the flowchart shown in FIG. In this embodiment, the power is already turned on. In step S1 of FIG. 5, the control means 60 determines whether or not there is information on the usage history of the drum unit 80, that is, whether or not the master is wound around the plate cylinder 9, by communicating with the storage means 95. If there is no information, it is determined that the factory is shipped, and the process proceeds to step S3 to execute the clamper opening operation. If the information on which the master is wound is stored in the storage means 95, it is assumed that the drum unit 90 that has already been used is attached to the apparatus body 8, that is, not at the time of factory shipment, and the process proceeds to step S2. Based on the output signal from the master detection means 96, it is determined whether or not the master is wound around the outer peripheral surface of the plate cylinder 9. If the master is not wound, the process proceeds to step S3.

  In the clamper opening operation in step S3, the clamp driving means 93 is operated to open the clamper 18, and the process proceeds to step S4 to execute the drum lock operation. In the drum lock operation, the lock unit 94 is operated to lock the drum unit 90 so that the drum unit 90 cannot be detached from the apparatus main body 8.

  In step S5, the state of the clamper is determined from, for example, the driving state of the clamp driving unit 93. If the clamp driving unit 93 is stopped, it is determined that the clamper is open. In step S6, the clamper is held open. The contents in the middle and the contents in the drum lock state are displayed, and the process proceeds to step S7.

  In step S7, it is determined whether or not the release information input unit 641 has been operated to generate a drum lock release operation request. If the release information input unit 641 has been operated to generate a drum lock release operation request, Assuming that the user of the apparatus has a drum unit removal request, the process proceeds to step S9. If a drum lock release operation request has not occurred, the process proceeds to step S8, where it is determined whether or not a plate making operation request has been generated by operating the plate making start key. If a plate making operation request is generated, the process proceeds to step S9.

  If the clamper 18 is in the open state, the drum unit 90 cannot be detached from the apparatus main body 8 or the master made from the plate cannot be clamped. Therefore, in step S9, the clamper is closed by controlling the operation of the clamp driving means 93. The operation is executed, and the process proceeds to step S10. In step S10, the lock unit 94 is released so that the drum unit 90 can be detached from the apparatus main body 8. In step S11, the display unit 642 displays the content that the drum lock is released, and the control is finished.

  That is, in this embodiment, the drum usage history stored in the storage means 95 provided in the drum unit 90 is in a state where there is no master, or on the outer peripheral surface of the plate cylinder 9 by the master detection means 96 provided in the apparatus main body 8. When the master is not wound, a clamper opening operation and a drum lock operation are executed. Thereafter, the current state is displayed on the display unit 642 of the operation panel 64 to notify the user of the apparatus that the drum unit 90 cannot be pulled out. When the apparatus user pulls out the drum unit 90 or when plate making is executed, a clamper closing operation and a drum lock releasing operation are executed.

  As described above, when the drum unit 90 having the plate cylinder 9 is mounted on the apparatus body 8, the operation of the clamper opening / closing means 92 is controlled so that the clamper 18 is opened. Since there is no need to sandwich the paper P as in the prior art at the time of shipment from the factory, it is possible to eliminate waste of resources and improve operability during initial setting while reducing costs.

  When the master is not wound on the outer peripheral surface of the plate cylinder 9, the operation of the clamper opening / closing means 92 is controlled by the control means 60 so that the clamper 18 is opened. Therefore, the clamper can be opened stably without performing any operation.

  In the present embodiment, when the clamper 18 is in the open state, the operation of the lock means 94 is controlled so that the drum unit 90 cannot be detached from the apparatus main body 8. Thus, the apparatus main body 8 remains in the clamper open state. The drum unit 90 can be prevented from being detached from the clamper 18, and damage to the clamper 18 and the apparatus main body 8 can be prevented.

  In this embodiment, the operation of the clamper opening / closing means 92 is controlled so that the clamper 18 is closed based on the release command input from the release information input means 641, and the lock means 94 is operated so as to be in the release state. Since the control unit 90 also controls the drum unit 90, the drum user 90 can be detached from the apparatus body 8 by operating the release information input unit 641.

  In this embodiment, since the display unit 642 is controlled by the control unit 60 so that the open / close state of the clamper 18 or the state of the lock unit 94 is displayed on the display unit 642, the state of the clamper 18 and the state of the lock unit 94 are indicated to the device user. And inadvertent removal of the drum unit 90 from the apparatus main body 8 can be prevented.

In this embodiment, it is determined in both steps S1 and S2 from the storage means 95 or the master detection means 96 that the master is not wound around the outer peripheral surface of the plate cylinder 9. After the determination is made only in the step, the clamper opening operation may be executed by proceeding to step S3.
(Second Embodiment)
In this embodiment, a timer 97 is added to the configuration of the stencil printing apparatus 1 shown in FIG. 1 as a measuring means for measuring an elapsed time after the release command is input from the release information input means 642 as shown in FIG. A new function is added to the control means 60. A transition time T1 is preset in the ROM 62 of the control means 60 according to the present embodiment. Then, as the control means 60, when the elapsed time T1 measured by the timer 97 exceeds the preset transition time T, the clamper is opened and closed so that the clamper 18 is opened regardless of the presence or absence of the release command. In addition to controlling the operation of the clamp driving means 93 of the means 92, the function of controlling the operation of the locking means 94 so as to be in a locked state is provided.

  The details of the control will be described with reference to the flowchart shown in FIG. The flowchart shown in FIG. 7 is obtained by removing the determination process of the plate making operation request occurrence from the flowchart shown in FIG. 5 and adding an elapsed time determination process. Step S21 to step S31 are shown in step S1 of FIG. To S11, the detailed description is omitted.

  The control means 60 displays the content of the drum lock being released on the display unit 642 in step S31, and then proceeds to step S32. Whether the elapsed time T1 measured by the timer 97 has passed the transition time T or not. Determine. Here, if the elapsed time T1 has passed the transition time T, the process returns to step S23 to perform the clamper opening operation and the drum lock operation.

  With such a configuration, when the elapsed time T1 measured by the timer 97 exceeds a preset transition time T, the clamper 18 is opened so that the clamper 18 is opened regardless of the presence or absence of a release command. Since the operation of the opening / closing means 92 is controlled and the operation of the locking means 94 is also controlled so as to be in the locked state, the drum unit 90 having the plate cylinder 9 can be detached from the released state where it can be detached from the apparatus body 8. It can automatically return to the prohibited state.

The transition time T set in the ROM 92 may be a fixed value, but as shown in FIG. 6, setting means 98 for inputting the transition time T2 is provided in the operation panel 64, for example, and the transition time T set in the ROM 92 is set. May be changed to the transition time Т2 input from the setting means 98. In this way, the drum unit 90 having the plate cylinder 9 can be freely set in accordance with the usage mode of the apparatus user according to the usage mode, in which the drum unit 90 automatically returns from the release state in which the drum unit 90 can be detached from the apparatus main body 8 to the disengagement prohibited state in which the drum unit 90 cannot be detached. Can be set to
(Third embodiment)
As shown in FIG. 8, the stencil printing apparatus 1 according to the present embodiment is configured so that the clamper opening / closing means 92 is in operation so that the clamper 18 is open, or the lock means 94 is in operation so that the clamp means 94 is locked. Circuit means for shutting off the power supply to the apparatus body 8 after the operation of the clamper opening / closing means 92 to the open state and after the operation of the lock means 94 to the locked state is stopped. 99. Since the configuration other than the circuit means 99 is the same as that shown in FIG. 4, the relationship between the configuration of the circuit means 99 and the control means 60 will be mainly described.

  The circuit means 99 is a power supply board, and includes a power supply detection unit 100, a DC conversion unit 101, and a relay 102. A main switch 103 for turning on / off the power to the apparatus main body 8 is connected to the input side of the power supply detection unit 100, and a DC conversion unit 101 is connected to the output side. Connected to the input side of the main switch 103 is a plug 104 that is inserted into a socket of a commercial power source (not shown). The power detection unit 100 and the DC conversion unit 101 are each connected to the main control plate 61 of the control means 60 and configured to supply power to each unit of the stencil printing apparatus 1 via the main control plate 61. . The relay 102 is connected between the plug 104 and the main switch 103 and between the power supply detection unit 100 and the DC conversion unit 101 so as to bypass the main switch 103 and the power supply detection unit 100, and the main control plate 61. Also connected to. The control means 60 is added with a function for controlling on / on of the relay 102. Specifically, when the clamper opening / closing means 92 is in operation or when the lock means 94 is in operation so as to be locked, the relay 102 is turned on to bring the contact into a connected state, and the main switch 103 and the power detection unit A bypass circuit that bypasses 100 is formed. That is, even when the main switch 100 is in the OFF state, the relay 102 is turned on and connected so that the power cutoff can be controlled by the relay 102.

  Processing in the control means 60 when the circuit means 99 having such a configuration is provided will be described using the flowchart shown in FIG. As shown in step S41 of FIG. 9, the control unit 90 turns on the relay 102 during operation of the apparatus, and when the main switch 103 is turned off in step S42, the clamper 18 is open in steps S43 and S44. It is determined from the operation signals of the clamp driving means 93 and the locking means 94 whether or not the lock means 94 is in the drum lock opening operation. And when the drive means of each part is act | operating, since the relay 102 is turned on and the contact is connected, the electric current from a power supply is supplied to the main control board 61. FIG. When the operation of the clamp drive means 93 and the lock means 94 is stopped and the operation signal disappears, it is determined that the opening operation of the clamper 18 is finished and the drum lock opening operation of the lock means 94 is finished, and in step S45, The relay 102 is turned off and the contact is separated to turn off the power.

  With such a configuration, the apparatus power is turned off from the main switch 103 during the operation of the clamper opening / closing means 92 so that the clamper 18 is in the open state or the lock means 94 so as to be in the locked state. Even when there is a command, the relay 102 is turned on and the contact is connected, so that the power source for the main control board 61 is secured. Therefore, the operation of the clamper opening / closing means 92 and the lock means 94 can be continued. Further, since the relay 102 is turned off and the contacts are separated after the operation of each part is stopped, the power supply to the apparatus main body 8 is interrupted by the circuit means 99, and the drum unit 90 can be detached from the apparatus main body 8. From this state, the drum unit 90 can be automatically returned to the detachment prohibited state where the detachment from the apparatus main body 8 is impossible.

1 is a front view illustrating a schematic configuration of a printing apparatus according to the present invention. It is a perspective view which shows schematic structure of the drum unit which can attach or detach a plate cylinder to an apparatus main body. It is an enlarged view which shows the structure of a master holding means. It is the schematic of a printing cylinder principal part. It is a block diagram which shows the structure of the control means which concerns on the 1st Embodiment of this invention. It is a flowchart which shows one form of control by the control means which concerns on 1st Embodiment. It is a block diagram which shows the structure of the control means which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows one form of control by the control means in 2nd Embodiment. It is a block diagram which shows the structure of the control means and circuit means which concern on the 3rd Embodiment of this invention. It is a flowchart which shows one form of control by the control means which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing apparatus 8 Apparatus main body 9 Plate cylinder 29 Master 60 Control means 67 Measuring means 91 Master holding means 92 Clamper opening / closing means 94 Locking means 95 Storage means 96 Master detection means 98 Setting means 99 Circuit means 641 Release information input means 642 Display part T Transition time T1 elapsed time

Claims (9)

A plate cylinder detachably attached to the apparatus main body, an openable / closable master holding means provided on the outer peripheral surface of the plate cylinder, and a clamper opening / closing means for opening / closing a clamper included in the master holding means at a predetermined position. In a printing apparatus having
A printing apparatus comprising control means for controlling the operation of the clamper opening / closing means so that the clamper is opened when the plate cylinder is attached to the apparatus main body when shipped from the factory. Storage means for storing information on whether or not a master is wound on the outer peripheral surface of the plate cylinder;
The control means controls the operation of the clamper opening / closing means so that the clamper is in an open state when the information on which the master is wound is not stored in the storage means. Item 2. The printing apparatus according to Item 1. Master detection means for detecting whether or not a master is wound on the outer peripheral surface of the plate cylinder,
The control means controls the operation of the clamper opening / closing means so that the clamper is in an open state when the master detection means does not detect that the master is wound. The printing apparatus according to 1 or 2. A lock means for releasing the plate cylinder from the apparatus main body, and a lock state for making the plate cylinder undetachable from the apparatus main body,
4. The printing apparatus according to claim 1, wherein the control unit controls the operation of the lock unit so that the lock unit is in the locked state when the clamper is in an open state. It has release information input means to input various release information,
The control means controls the operation of the clamper opening / closing means so that the clamper is in a closed state based on a release command inputted from the release information input means, and the lock means is set so as to be in the released state. The printing apparatus according to claim 4, wherein the operation is controlled. Measuring means for measuring the elapsed time since the release command is input from the release information input means,
When the elapsed time measured by the measuring means exceeds a preset transition time, the control means is configured to open the clamper opening / closing means so that the clamper is opened regardless of the presence / absence of the release command. 6. The printing apparatus according to claim 5, wherein the operation of the lock unit is controlled so as to be in the locked state while controlling the operation. Setting means for inputting the transition time;
The printing apparatus according to claim 6, wherein the control unit changes a preset transition time to a transition time input from the setting unit.   The clamper opening / closing means when the clamper opening / closing means is in operation so that the clamper is in the open state, or when there is a command to turn off the apparatus power supply while the lock means is in operation to be in the locked state. 5. The printing apparatus according to claim 4, further comprising circuit means for cutting off the power supply to the apparatus main body after the operation to the open state is stopped and after the operation of the lock means to the locked state is stopped. Having a display to display the status of the device;
The printing apparatus according to claim 1, wherein the control unit controls the display unit to display a state of the clamper or a state of the lock unit.

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