JP2012125994A - Plate making apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a stencil original paper from coming off from a feeding passage after the stencil original paper is cut by a cutter.SOLUTION: The plate making apparatus includes: a thermal head 67 for heating and boring the stencil original paper; a fan 74 for blowing air to the thermal head 67; a cutter member 68 which is provided at a lower stream side than the thermal head 67 on the feeding passage, and cuts the heated and bored stencil original paper; a first feed roller 69 which is provided at a lower stream side than the cutter member 68 on the feeding passage, and feeds the stencil original paper by pressuring and rotating of a roller from a vertical direction of the stencil original paper; and a control part 20 which starts blowing to the fan 74 when heating and boring is started by the thermal head 67 and stops blowing to the fan 74 when the stencil original paper fed by the first feed roller 69 is cut by the cutter member 68.

Description

  The present invention relates to a plate making apparatus for making a stencil sheet.

  In general, a plate making apparatus mounted on a stencil printing apparatus and making a plate by heating and perforating a thermal head based on image data while conveying a stencil sheet wound in a roll shape is well known ( For example, see Patent Document 1). Specifically, the plate making apparatus selectively transfers each point-like heating element of the thermal head based on the read image data while a conveyance roller provided on the conveyance path conveys a long stencil sheet. A stencil sheet having a predetermined length is produced by performing a heat-sensitive operation to make a stencil sheet with heat-sensitive perforations and making the stencil sheet with a cutter.

  Patent Document 2 proposes a thermal recording apparatus that includes a thermal head that heats an ink sheet coated with ink and transfers the ink sheet to recording paper, and a fan that dissipates heat stored in the thermal head.

Japanese Patent Laid-Open No. 2002-19247 JP-A-6-15922

  However, when the technology of the thermal recording apparatus described in Patent Document 2 is applied to the plate making apparatus described in Patent Document 1 and a fan that dissipates the heat stored in the thermal head is provided, the heat-drilled stencil sheet is placed in the cutter. In some cases, the leading edge of the stencil sheet may be removed from the conveyance path due to the blowing of the fan.

  As described above, when the leading edge of the stencil sheet is deviated from the transport path, the user needs to return the stencil sheet to the transport path at the next plate making, which is troublesome for the user.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a plate making apparatus that prevents the stencil sheet from being removed from the conveyance path even after the stencil sheet is cut by a cutter. .

  In order to achieve the above object, the first feature of the plate making apparatus according to the present invention is that a thermal head that heats and punches a stencil sheet transported on a transport path, a fan that blows air to the thermal head, A cutter that is provided on the downstream side of the thermal head on the transport path and cuts the stencil sheet that has been heat-pierced, and a roller that is provided on the downstream side of the cutter on the transport path, and has a roller from above and below the stencil sheet. A conveying means for conveying the stencil sheet by rotating while being pressed, and when the thermal head starts hot punching, the fan starts air blowing, and the stencil sheet conveyed by the conveying means is And a control means for causing the fan to stop blowing air when it is cut.

  A second feature of the plate making apparatus according to the present invention is that the control means is provided on the downstream side of the transport means on the transport path, and detects the leading edge of the transported stencil sheet; and The stencil sheet upstream of the stencil sheet on the transport path cut by the cutter is transported by the transport means, and the leading end of the transported stencil sheet is detected by the stencil sheet detecting means. When this is done, the fan is allowed to resume air blowing.

  A third feature of the plate-making apparatus according to the present invention is that a thermal head that heats and punches a stencil sheet transported on a transport path, a fan that blows air to the thermal head, and the thermal that is on the transport path. A cutter provided on the downstream side of the head and for cutting the stencil sheet that has been heat-pierced, and provided on the downstream side of the cutter on the conveyance path, and a roller is rotated while being pressed from above and below the stencil sheet. Conveying means for conveying the stencil sheet, stencil sheet detecting means for detecting the front end of the conveyed stencil sheet provided on the downstream side of the conveying means on the conveying path, and the conveying unit cut by the cutter The upstream stencil sheet on the path is transported by the transport means, and the leading end of the transported stencil sheet is detected by the stencil sheet detecting means. When issued, it lies in that a control means for starting the blower to the fan.

  According to the plate making apparatus according to the present invention, it is possible to prevent the stencil sheet from being removed from the conveyance path even after the stencil sheet is cut by the cutter.

1 is a configuration diagram illustrating a configuration of a double-sided stencil printing apparatus to which a plate making apparatus according to an embodiment of the present invention is applied. It is the figure explaining the structure of the plate-making apparatus which is one Embodiment of this invention in detail. It is a functional block diagram which showed the functional structure of the plate-making apparatus which concerns on one Embodiment of this invention. It is the timing chart which showed the platemaking process in the platemaking apparatus which is a prior art. It is a figure explaining the movement of the stencil paper at the time of performing the plate-making process in the plate-making apparatus which is a prior art. It is a timing chart showing plate making processing in a plate making apparatus which is one embodiment of the present invention.

  A mode for carrying out the present invention will be described below.

  In one embodiment of the present invention, a plate making apparatus applied to a two-drum double-sided stencil printing apparatus capable of double-sided printing will be described as an example.

<Configuration of double-sided stencil printing machine>
A configuration of a double-sided stencil printing apparatus to which a plate making apparatus according to an embodiment of the present invention is applied will be described.

  FIG. 1 is a configuration diagram showing a configuration of a double-sided stencil printing apparatus to which a plate making apparatus according to an embodiment of the present invention is applied.

  As shown in FIG. 1, the double-sided stencil printing apparatus 1 includes an image reading unit 2, a paper feeding unit 3, a first printing unit 4, a second printing unit 5, a plate making device 6, and a first printing device. A plate discharge unit 8, a second plate discharge unit 9, a reverse storage unit 10, and a paper discharge unit 11 are provided.

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

  The plate making device 6 performs plate making based on the image data read by the image reading unit 2.

  Further, the plate making apparatus 6 is supported by a rail (not shown) so as to be movable in the X direction in FIG. 1, and the position indicated by a broken line for supplying the stencil sheet G and the stencil plate made on the second printing unit 5 described later. It selectively occupies the position indicated by the solid line for supplying the base paper G.

  The first stencil printing unit 8 peels the stencil sheet G released from the outer peripheral surface of the first drum 41 of the first printing unit 4 to be described later from the first drum 41 and peels it off. Is stored in a plate removal box (not shown). Further, the second plate discharging unit 9 has the same configuration as the first plate discharging unit 8.

  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 feeds transporting 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 printing unit 4 to be described later. And a roll 33.

  The first printing unit 4 is provided on a first drum 41 that rotates in the direction of arrow A in FIG. 1 by a driving force of a main motor (not shown), and an outer peripheral surface of the first drum 41. And a base paper clamp part 42 for clamping the tip of the paper.

  The first printing unit 4 includes a reference position detection unit 46 that detects the reference position of the first drum 41, and a rotary encoder (not shown) that outputs a pulse signal at a fixed period according to the rotation of the main motor. The rotation position of the first drum 41 can be detected by detecting the pulse signal of the rotary encoder based on the reference position signal detected by the reference position detector 46.

  The first printing unit 4 includes a conveyance belt 44 that conveys the printing paper W to the reversal storage unit 10, and a first press roller 43 that is disposed below the first drum 41.

  Then, the printing paper W fed from the paper feeding unit 3 in synchronism with the rotation of the first drum 41 is pressed against the first stencil sheet on the first drum 41 by the first press roller 43. By doing so, ink is pushed out from the perforations of the first stencil sheet, and an image is printed on the surface of the printing paper W.

  The printing paper W on which an image is printed by the first press roller 43 being pressed against the first drum 41 is conveyed to the reversal storage unit 10 by an annular conveying belt 44 having both ends wound around a pair of rotating shafts. Is done.

  The reverse storage unit 10 is arranged on the downstream side in the transport direction of the printing paper W with respect to the first printing unit 4, and an annular reverse belt 101 formed in a porous structure is arranged in a semicircular shape. The reverse belt 101 is wound around a semicircular auxiliary member 102 and a pair of rollers 103 and 104, and at least one of the pair of rollers 103 and 104 is rotationally driven by a drive motor (not shown). The reverse storage unit 10 reverses the front and back of the printing paper W, and the printing paper W is conveyed to the stacking table 106.

  Similar to the first printing unit 4, the second printing unit 5 is provided on the second drum 51 rotating in the direction of arrow A in FIG. 1 and the outer peripheral surface of the second drum 51. A base paper clamping unit 52 that clamps the leading end of the stencil base paper, a second press roller 53 disposed below the second drum 51, and the printing paper W reversed by the reversal storage unit 10 is transferred to the second drum 51. A pair of secondary paper feed rolls 54 transported between the second drum 51 and the second press roller 53 in synchronization with the rotation of the stencil, and a part of the leading edge of the stencil paper G clamped by the base paper clamp unit 52 is detected. And a second detection unit 55.

  Similarly to the first printing unit 4, the second printing unit 5 outputs the second printing paper W fed from the pair of secondary paper feeding rolls 54 in synchronization with the rotation of the second drum 51. By pressing the stencil sheet G on the second drum 51 by the press roller 53, ink is pushed out from the perforations of the stencil sheet G and an image is printed on the back surface of the printing paper W. Yes.

  The paper discharge unit 11 includes a paper discharge belt 111 on which the printed print paper W is conveyed, a paper discharge tray 112 on which the print paper W discharged from the paper discharge belt 111 is stacked, and a plurality of stacks on the stack 106. An intermediate conveyance belt 113 that carries out the stacked printing paper W and a pair of rollers 115 that convey the printing paper W carried out by the intermediate conveyance belt 113 to the second printing unit 5 are provided.

<Configuration of plate making apparatus 6>
FIG. 2 is a diagram illustrating in detail the configuration of the plate making apparatus 6 according to an embodiment of the present invention.

  As shown in FIG. 2, in the plate making apparatus 6, an annular cylindrical stencil roll 61 around which the stencil sheet G is wound is mastered so as to be rotatable in the B direction at an angular velocity that changes according to the winding diameter of the stencil sheet G. The stencil paper roll 61 is supported in the holder 62 and is detachably supported with respect to the master holder 62. Here, as the stencil sheet G, for example, a screen master base paper in which a heat-sensitive film is bonded on a lattice-shaped plastic mesh, a Japanese paper master base paper in which a heat-sensitive film is bonded on Japanese paper, or the like is used.

  Downstream of the stencil sheet roll 61, the first and second guide shafts 63 and 64, a platen roller 66 that is driven to rotate at a predetermined constant speed in the C direction by the platen pulse motor 65, and a plurality of heating elements. 67a are arranged in a line in the direction perpendicular to the paper surface and can be freely contacted and separated through a pressing mechanism (not shown) with respect to the platen roller 66, and a thermal head 67 that performs thermal perforation based on image data while being pressed against the stencil sheet G; The fan 74 that blows air to cool the thermal head 67 and the first stencil 41 or the second printing unit 5 provided in the first printing unit 4 to be described later are used for the stencil sheet G that has been made. A pair of upper and lower cutter members 68 that are cut by a length of one plate set to be equal to or less than the circumferential length of the second drum 51, and a top and bottom that are rotationally driven by using a platen pulse motor 65 in common. A pair of first feed rollers 69, a stencil sheet storage box 70 that temporarily stores the stencil sheet G that has been made, a stencil sheet conveyance detection sensor 71 that detects the conveyance state of the stencil sheet G that has been made, and a pair of upper and lower A second feed roller 72 and a pair of upper and lower third feed rollers 73 are provided in the above order toward the first printing unit 4 or the second printing unit 5 along the transport path of the stencil sheet G.

  The stencil sheet G conveyed by the first, second and third feed rollers 69, 72, 73 is clamped (sandwiched) by the stencil sheet clamping portion 42 of the first drum 41.

  When the stencil sheet G is clamped and the first drum 41 rotates in the A direction, the stencil sheet G is deposited on the surface of the first drum 41 and the first drum 41 rotates to a predetermined position. The pair of upper and lower cutter members 68 cut the stencil sheet G.

  The upper and lower pair of first, second, and third feed rollers 69, 72, and 73 are configured such that each upper driven roller can contact and separate from each lower drive roller. The first feed roller 69 shares the platen pulse motor 65, and the second and third feed rollers 72 and 73 share the feed roller pulse motor 75.

  Also, in the conveyance path of the stencil sheet G from the pair of upper and lower cutter members 68 to the pair of upper and lower third feed rollers 73, the parts are arranged close to each other, unlike the illustration, so that the rigidity of the stencil sheet G depends on the rigidity. The stencil sheet G can be surely traveled along the transport path, but if the parts are separated from each other, a guide plate (not shown) for guiding the transport of the stencil sheet G is installed as necessary. You may do it.

<Functional configuration of plate making apparatus 6>
FIG. 3 is a functional configuration diagram showing a functional configuration of the plate making apparatus 6 according to one embodiment of the present invention.

  As shown in FIG. 3, the plate making apparatus 6 according to an embodiment of the present invention includes an operation unit 15, a control unit 20, a fan 74, a thermal head 67, a cutter member 68, a platen pulse motor 65, and the like. A stencil sheet conveyance detection sensor 71 and a feed roller pulse motor 75 are provided.

  Among these configurations, the fan 74, the cutter member 68, the platen pulse motor 65, the stencil sheet conveyance detection sensor 71, and the feed roller pulse motor 75 have been described above, and thus description thereof will be omitted.

  As shown in FIG. 3, the thermal head 67 includes a thermal temperature sensor 67b for measuring the temperature of the thermal head main body.

  The operation unit 15 includes various operation keys such as a start key for starting plate making and the like, and a stop key (none of which is not shown) for stopping plate making and the like, and controls operation signals based on user operations. 20 is supplied.

  The operation unit 15 includes a display / input panel 15a. The display / input panel 15a is disposed on the front surface of the pressure-sensitive or electrostatic transparent touch panel, and on the back surface of the touch panel. A liquid crystal display panel (none of which is shown) for displaying a display screen. The user can perform various button pressing operations by directly touching the surface of the touch panel with a finger or the like while viewing the display screen of the liquid crystal display panel. The operation unit 15 displays various messages based on instructions from the control unit 20.

  The control unit 20 performs central control of the plate making apparatus 6. For example, the control unit 20 of the plate making apparatus 6 causes the fan 74 to start blowing air when the thermal head 67 starts heating and when the stencil sheet G is cut by the cutter member 68, The fan 74 is controlled to temporarily stop air blowing.

  Further, when the leading end of the cut stencil sheet G passes through the first feed roller 69 and is detected by the stencil sheet conveyance detection sensor 71, the control unit 20 controls the fan 74 to start air blowing again. .

<Operation of plate making apparatus 6>
Before describing the operation of the plate making apparatus 6 according to an embodiment of the present invention, first, the operation of the plate making apparatus as the prior art will be described.

  FIG. 4 is a timing chart showing a plate making process in a plate making apparatus which is a conventional technique.

  As shown in FIG. 4, at time t <b> 1, the thermal head 67 is pressed against the platen roller 66 by the pressing mechanism, and is thereby pressed against the stencil sheet G.

  At time t3, when the platen pulse motor 65 starts to be driven, the platen roller 66 and the first feed roller 69 are rotationally driven. As a result, the stencil sheet G is conveyed on the conveying path, and the feed roller pulse motor 75 starts to be driven at time t5, whereby the second and third feed rollers 72 and 73 are rotationally driven. As a result, the stencil sheet G is conveyed to the first drum 41 or the second drum 51 and is applied to the surface of the first drum 41 or the second drum 51.

  Similarly, at time t <b> 5, the thermal head 67 starts thermal perforation based on the image data read by the image reading unit 2, and the fan 74 starts blowing air to the thermal head 67.

  Further, the stencil sheet G is clamped and the first drum 41 rotates, and at time t7 when the first drum 41 rotates to a predetermined position, the pair of upper and lower cutter members 68 remove the stencil sheet G from the stencil sheet G. Start cutting.

  At time t7 when the cutter member 68 starts cutting the stencil sheet G, the thermal head 67 stops thermal perforation, and the platen pulse motor 65 and the feed roller pulse motor 75 also stop driving.

  At this time, the leading end of the cut stencil sheet G is not in pressure contact with any part, and therefore, the blown air from the fan 74 may be removed from the conveyance path.

  FIG. 5 is a diagram for explaining the movement of the stencil sheet when the plate making process is executed in the plate making apparatus as the prior art.

  As shown in FIG. 5A, when the thermal head 67 starts thermal perforation, the fan 74 starts blowing air to the thermal head 67. As a result, a part of the air blown to the fan 74 may wrap around the thermal head 67 and be blown onto the stencil sheet G as indicated by an arrow F in the drawing.

  Then, when the stencil sheet G is cut by the cutter member 68, the tip of the cut stencil sheet G is not pressed against any part, so as shown in FIG. Pressed.

  Further, as shown in FIG. 5C, the stencil sheet G receives wind from the fan 74, and the leading edge of the stencil sheet G comes off the conveyance path so as to go around the platen roller 66.

  As described above, when the leading edge of the stencil sheet G is deviated from the transport path, the user needs to return the stencil sheet G to the transport path at the time of next plate making, which is troublesome for the user.

  Therefore, in the plate making apparatus 6 according to an embodiment of the present invention, the fan 74 is controlled so that the leading edge of the stencil sheet G does not come off the conveyance path. Specifically, the control unit 20 of the plate making apparatus 6 causes the fan 74 to start blowing air when the thermal head 67 starts heating and when the stencil sheet G is cut by the cutter member 68, the fan 74. Pause the air flow. The upstream stencil sheet G on the transport path cut by the cutter member 68 is transported by the first feed roller 69, and the leading end of the transported stencil sheet G passes through the first feed roller 69 and transports the stencil sheet. When detected by the detection sensor 71, the fan 74 is controlled to start air blowing again.

  FIG. 6 is a timing chart showing plate making processing in the plate making apparatus 6 according to an embodiment of the present invention. Here, the operations of the thermal head 67, the platen pulse motor 65, the feed roller pulse motor 75, and the cutter member 68 from time t1 to time t7 are the same as the operations shown in the timing chart of FIG. Therefore, explanation is omitted.

  In the plate making apparatus 6 according to an embodiment of the present invention, as shown in FIG. 6, when the stencil sheet G is completely cut by the cutter member 68 at time t9, the fan 74 temporarily stops air blowing. Thereby, it is possible to prevent a part of the air blown to the fan 74 from flowing around the thermal head 67 and blowing it to the stencil sheet G.

  Further, at the time t9 when the cutting of the stencil sheet G is completed, the feed roller pulse motor 75 starts to be driven, whereby the second and third feed rollers 72 and 73 are rotationally driven. Thereby, the stencil sheet G is transported to the first drum 41 or the second drum 51, and at t11, the stencil sheet transport detection sensor 71 switches the detection state of the transported stencil sheet G from ON to OFF. That is, the rear end of the stencil sheet G is detected.

  Then, after the stencil sheet conveyance detection sensor 71 detects the rear end of the stencil sheet G, at a time t13 when a predetermined time has elapsed, the stencil sheet G is fed from the first drum 41 or the second drum 51 on the conveyance path. Therefore, the driving of the feed roller pulse motor 75 is stopped. Thereby, the rotational drive of the 2nd, 3rd feed rollers 72 and 73 stops.

  On the other hand, at time t13, the platen pulse motor 65 starts to drive the cut stencil sheet G on the stencil sheet roll 61 side on the transport path. As a result, the platen roller 66 and the first feed roller 69 are rotationally driven, and the stencil sheet G is conveyed on the conveyance path.

  The leading end of the conveyed stencil sheet G passes through the first feed roller 69, and at time t15, the detected state of the conveyed stencil sheet G is switched from OFF to ON by the stencil sheet conveyance detection sensor 71. When the leading edge of the stencil sheet G is detected, the fan 74 starts air blowing again.

  As a result, since the blow of the fan 74 is stopped from the time t9 to the time t15 when the leading edge of the stencil sheet G is not pressed by the first feed roller 69, the leading edge of the stencil sheet G comes off the conveyance path. Can be prevented.

  As described above, according to the plate making apparatus 6 according to one embodiment of the present invention, when the thermal perforation is started by the thermal head 67, the fan 74 starts air blowing and the stencil sheet G is cut by the cutter member 68. Then, the fan 74 is temporarily stopped to blow air. When the leading edge of the cut stencil sheet G passes through the first feed roller 69 and is detected by the stencil sheet conveyance detection sensor 71, the fan 74 is blown again. Since control is performed so as to start, it is possible to prevent the leading edge of the stencil sheet G from being removed from the transport path, thereby preventing the user from returning the stencil sheet to the transport path during the next plate making. Plate making can be performed.

  In the plate making apparatus 6 according to an embodiment of the present invention, the control unit 20 that controls each device provided in the plate making apparatus 6 is provided. However, the present invention is not limited thereto, and the double-sided stencil printing apparatus 1 is controlled. It is good also as a structure provided as a control part common to the control part to perform.

  Further, in one embodiment of the present invention, the surface of the printing paper W is printed by the upstream drum on which the stencil sheet G is set, and the back surface of the printing paper W is printed by the downstream drum on which the stencil sheet G is set. The plate making apparatus 6 applied to the two-drum type two-sided stencil printing apparatus 1 that prints the image has been described as an example. You can also.

DESCRIPTION OF SYMBOLS 1 ... Double-sided stencil printer 6 ... Plate making apparatus 15 ... Operation part 15a ... Display / input panel 20 ... Control part 61 ... Stencil paper roll 62 ... Master holder 63 ... 2nd guide shaft 65 ... Platen pulse motor 66 ... Platen roller 67 ... thermal head 67a ... heating element 67b ... thermal temperature sensor 68 ... cutter member 69 ... first feed roller (conveying means)
DESCRIPTION OF SYMBOLS 70 ... Stencil paper storage box 71 ... Stencil paper conveyance detection sensor 72 ... 2nd feed roller 73 ... 3rd feed roller 74 ... Fan 75 ... Pulse motor for feed rollers

Claims (3)

A thermal head that heats and punches the stencil sheet transported on the transport path;
A fan for blowing air to the thermal head;
A cutter provided on the downstream side of the thermal head on the conveying path, for cutting the stencil sheet that has been heat-pierced;
A conveying means that is provided on the downstream side of the cutter on the conveying path and conveys the stencil sheet by rotating while pressing a roller from above and below the stencil sheet;
Control means for causing the fan to start blowing when the thermal head is started by the thermal head, and for causing the fan to stop blowing when the stencil sheet conveyed by the conveying means is cut by the cutter; ,
A plate making apparatus characterized by comprising: A stencil sheet detecting means provided on the downstream side of the transport means on the transport path, and detecting a tip of the transported stencil sheet;
The control means further includes
When the upstream stencil sheet on the transport path cut by the cutter is transported by the transport means, and the leading edge of the transported stencil sheet is detected by the stencil sheet detection means, the fan is resumed to blow air The plate making apparatus according to claim 1, wherein: A thermal head that heats and punches the stencil sheet transported on the transport path;
A fan for blowing air to the thermal head;
A cutter provided on the downstream side of the thermal head on the conveying path, for cutting the stencil sheet that has been heat-pierced;
A conveying means that is provided on the downstream side of the cutter on the conveying path and conveys the stencil sheet by rotating while pressing a roller from above and below the stencil sheet;
A stencil sheet detecting means provided on the downstream side of the transport means on the transport path, for detecting a tip of the transported stencil sheet;
When the upstream stencil sheet on the transport path cut by the cutter is transported by the transport means, and the leading edge of the transported stencil sheet is detected by the stencil sheet detecting means, the fan starts to blow. Control means for causing
A plate making apparatus characterized by comprising:

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