JP2012076831A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take out a printing sheet that is printed, without moving a delivery fence by a user, and also enable starting of printing again.SOLUTION: An image forming apparatus includes: a delivery table 112 for placing the printed printing sheet W; side fences 113, 114 and an end fence 115, which are arranged on the sheet delivery table, and which are changeable between a standing position for controlling a placing position on the sheet delivery table 112 while interfering with a printed printing medium and a tilting position for not controlling the placing position of the printing sheet W; and a delivery fence driving mechanism 130 for driving the side fences 113, 114 and the end fence 115 to achieve the standing position or the tilting position.

Description

  The present invention relates to an image forming apparatus including a paper discharge tray on which printed print media are stacked.

  In general, a stencil printing apparatus that performs printing by winding a stencil sheet that has been stenciled around a drum, feeding paper to the drum, and pressing the supplied printing paper against the drum by a press roller is good. Are known.

  Printing paper printed by such a general stencil printing apparatus is stacked on a paper discharge tray provided on the side surface of the stencil printing apparatus.

  In Japanese Patent Laid-Open No. 2004-260688, a paper discharge table on which the discharged print paper is placed, an upright position that is provided on the paper discharge table and regulates a placement position of the discharged print paper, and a print paper placement. A discharge fence that can be changed to a tilt position where the installation position cannot be regulated, a fence fall detection sensor that detects whether the discharge fence is in an upright position or a tilt position, and the fence fall detection sensor There has been proposed a stencil printing apparatus including an output unit that outputs an error warning when a plate making operation or a printing operation is selected in a state in which it is detected that the paper fence is in a tilted position.

JP 2001-322258 A

  However, the stencil printing apparatus described in Patent Document 1 outputs an error warning when a plate-making operation or a printing operation is selected in a state in which the fence-falling detection sensor detects that the paper discharge fence is located at the tilted position. Therefore, in order to print again, the user has to move the paper discharge fence to the upright position.

  The present invention has been made in view of the above problems, and provides an image forming apparatus in which a user can take out printed printing paper without moving a paper discharge fence and start printing again. For the purpose.

  In order to achieve the above object, a first feature of an image forming apparatus according to the present invention is a printing unit that prints on a print medium, a paper discharge tray on which the printed print medium is placed, and the top of the paper discharge table. A discharge fence that can be shifted to an upright position that interferes with the printed print medium and restricts the placement position on the discharge stand and a tilt position that does not restrict the placement position of the print medium. And a paper discharge fence drive mechanism that drives the paper discharge fence so as to be in the standing position or the tilted position.

  A second feature of the image forming apparatus according to the present invention is that when the printing by the printing unit is finished and the placement of the printing medium on the paper discharge table is finished, the paper discharge fence is in the tilted position. And a drive control means for driving the paper discharge fence drive mechanism.

  A third feature of the image forming apparatus according to the present invention is further provided with detection means for detecting a print medium placed on the paper discharge table, and the drive control means detects the print medium by the detection means. When there is no longer necessary or when printing by the printing unit is requested, the discharge fence drive mechanism is driven so that the discharge fence is in the upright position.

  According to the first feature of the image forming apparatus according to the present invention, the user can take out the printed printing paper and move the printing again without moving the discharge fence.

  According to the second feature of the image forming apparatus of the present invention, when printing by the printing unit is completed, the discharge fence drive mechanism is driven so that the discharge fence is in the tilted position, so that the user can always discharge. The print medium placed on the paper board can be taken out.

  According to the third feature of the image forming apparatus of the present invention, when the print medium is not detected by the detection unit, or when the print unit is requested to start printing, the discharge fence is set to the upright position. Since the paper discharge fence drive mechanism is driven, the paper discharge fence can be raised to prepare for the next printing.

It is the block diagram which showed the structure of the double-sided stencil printing apparatus which is one Embodiment of this invention. 1 is a configuration diagram illustrating a configuration of a paper discharge unit provided in a double-sided stencil printing apparatus according to an embodiment of the present invention. It is a side view of the discharge fence drive mechanism of the side fence provided in the double-sided stencil printing apparatus which is one embodiment of the present invention. It is a functional block diagram which showed the functional structure of the double-sided stencil printing apparatus which concerns on one Embodiment of this invention. It is the flowchart which showed the processing flow of the double-sided stencil printing apparatus which is one Embodiment of this invention.

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

  In one embodiment of the present invention, an image is read from a document, and based on the read image, the surface of the printing paper (printing medium) is printed by the upstream drum around which the first stencil sheet is wound, A two-drum double-sided stencil printing apparatus that prints the back side of the printing paper with a downstream drum around which two stencil sheets are wound will be described as an example.

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

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

  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 unit 6, and a first printing unit. A plate discharge unit 8, a second plate discharge unit 9, a reversing 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 unit 6 includes a base paper storage unit 61 that stores the rolled long stencil sheet G, a thermal head 62 that is disposed downstream of the base paper storage unit 61 and that heats and punches the stencil base sheet G, and a thermal head 62. A platen roll 63 disposed at a position opposite to the head 62, a pair of base paper feed rolls 64 disposed downstream of the transport of the platen roll 63 and the thermal head 62, and a downstream of transport of the pair of base paper feed rolls 64. It has a base paper cutter 65 and performs plate making based on the image data read by the image reading unit 2.

  Further, the plate making unit 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. Are provided with a base paper clamp unit 42 that clamps the leading edge of the paper, a transport belt 44 that transports the printing paper W to the reversing 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 synchronization with the rotation of the first drum 41 is pressed against the first stencil sheet wound around the first drum 41 by the first press roller 43. By doing so, ink is pushed out from the perforation of the first stencil sheet, and an image is printed on the surface of the printing apparatus 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 reversing unit 10 by an annular conveying belt 44 having both ends wound around a pair of rotating shafts. The

  The reversing unit 10 is disposed downstream of the first printing unit 4 in the transport direction of the printing paper W, and an annular reversing belt 101 formed in a porous structure is disposed 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 reversing unit 10 reverses the front and back of the printing paper W, and the printing paper W is conveyed to the stacking table 106.

  A plurality of printing sheets W stacked on the stacking platform 106 are conveyed to the second printing unit 5 by an intermediate conveying belt 107 and a pair of rollers 109.

  Similar to the first printing unit 4, the second printing unit 5 outputs 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. By pressing the second stencil sheet wound around the second drum 51 with the roller 53, the ink is pushed out from the perforations of the second stencil sheet so that the image is printed on the back surface of the printing paper W. It has become.

  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.

  FIG. 2 is a perspective view showing the paper discharge unit 11 provided in the double-sided stencil printing apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 2, the paper discharge tray 112 is disposed at a position where the print paper W to be discharged falls, and a pair of side fences 113 and 114 as a paper discharge fence and an end fence are disposed on the paper discharge tray 112. 115 is provided. The pair of side fences 113 and 114 and the end fence 115 can be shifted between an upright position that interferes with the discharged print paper W and restricts the placement position, and a tilt position that cannot restrict the placement position of the print paper W. Is provided. The pair of side fences 113, 114 are provided so as to be movable in the left-right direction indicated by arrows X1 or X2 in the figure, and the end fence 115 is provided so as to be movable in the front-rear Z1 or Z2 direction. The left and right ends of the discharged print paper W are restricted, and the end fence 115 restricts the front end of the discharged print paper W.

  A paper discharge fence driving mechanism is provided for driving the pair of side fences 113 and 114 and the end fence 115 so as to be in the standing position or the tilting position.

  FIG. 3 is a side view of the paper discharge fence drive mechanism 130 of the side fence 114 provided in the double-sided stencil printing apparatus 1 according to an embodiment of the present invention. The discharge fence drive mechanism 130 is provided corresponding to each of the side fences 113 and 114 and the end fence 115 and has the same configuration. The fence drive mechanism 130 will be described.

  As shown in FIG. 3, the paper discharge fence drive mechanism 130 includes a moving unit 116, a motor 118, a tilt worm gear 119, and a tilt gear 120.

  The moving unit 116 is provided on the paper discharge tray 112, and a motor 118 is fixed on the moving unit 116. The moving unit 116 includes a pair of rollers 117a and 117b, and at least one of the pair of rollers 117a and 117b is rotationally driven by a drive motor (not shown), so that the moving unit 116 is X1. Or move in the X2 direction. Thereby, the motor 118 fixed on the moving unit 116 also moves in the X1 or X2 direction.

  The motor 118 rotates the motor shaft and rotates the tilting worm gear 119 fixed to the motor shaft according to an instruction from the control unit 20 described later. When the tilting worm gear 119 rotates, the rotational drive is transmitted to the tilting gear 120 engaged with the tilting worm gear 119, and the side fence 114 fixed to the tilting gear 120 tilts in the direction of the arrow Y1 or Y2 in the figure. To do.

  As shown in FIG. 3, a position where the side fence 114 tilts in the direction of the arrow Y1 in the drawing and the placement position of the printing paper W on the paper discharge tray 112 cannot be regulated is called a tilt position. A position that rises in the direction of the arrow Y2 in the drawing and interferes with the printing paper W and restricts the placement position is referred to as an upright position. Note that the standing position is not necessarily upright with respect to the moving unit 116, and an inclination that allows the placement of the printing paper W to be regulated is allowed.

  FIG. 4 is a functional configuration diagram showing a functional configuration of the double-sided stencil printing apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 4, the double-sided stencil printing apparatus 1 according to an embodiment of the present invention includes a paper discharge unit 11, an operation unit 15, and a control unit 20.

  The operation unit 15 is provided at the upper part of the double-sided stencil printing apparatus 1, and includes a start key for starting plate-making and printing, a stop key for stopping plate-making and printing, and a numeric keypad for inputting the number of prints ( Various operation keys such as none (not shown) are provided, and an operation signal based on a user operation is supplied to the control unit 70.

  The paper discharge unit 11 includes a fence collapse detection sensor 121, a paper presence / absence sensor 122, and a motor 118.

  The fence collapse detection sensor 121 includes fence collapse detection sensors 121a, 121b, and 121c corresponding to the pair of side fences 113 and 114 and the end fence 115, respectively, and the pair of side fences 113 and 114 and the end fence 115 are standing positions, respectively. Or the tilt position.

  The paper presence / absence sensor 122 detects whether or not the printing paper W is placed on the paper discharge tray 112.

  The motor 118 includes motors 118a, 118b, and 118c corresponding to the pair of side fences 113 and 114 and the end fence 115, respectively, and according to instructions from the control unit 20 described later, the pair of side fences 113 and 114 and the end fence, respectively. It drives so that 115 may become a standing position or a tilting position.

  The control unit 20 performs central control of the double-sided stencil printing apparatus 1. Specifically, the control unit 20 includes an image reading unit 2, a paper feeding unit 3, a first printing unit 4, a second printing unit 5, a plate making unit 6, and a first plate discharging unit 8. The second plate discharging unit 9, the reversing unit 10, the paper discharge unit 11, and the operation unit 15 are controlled.

  Moreover, the control part 20 is provided with the determination part 20a and the drive control part 20b on the function.

  The determination unit 20 a determines whether or not the printing paper W is placed on the paper discharge tray 112 based on the detection result of the paper presence sensor 122. Further, the determination unit 20a determines whether or not an operation signal for requesting the start of printing is supplied from the operation unit 15 by a user operation.

  When the printing of all the copies by the first printing unit 4 and the second printing unit 5 is finished and the placement of the printing paper W on the paper discharge tray 112 is finished, the drive control unit 20b completes a pair of side fences. The paper discharge fence driving mechanism 130 provided corresponding to the pair of side fences 113 and 114 and the end fence 115 is driven so that the 113 and 114 and the end fence 115 are in the tilted position.

  In addition, the drive control unit 20b causes the pair of side fences 113 and 114 and the end fence 115 to be in the standing position when the printing paper W is not detected by the paper presence sensor 122 or when printing is requested. The paper discharge fence drive mechanism 130 is driven.

<Operation of the double-sided stencil printing apparatus 1>
Next, the operation of the double-sided stencil printing apparatus 1 that is an embodiment of the present invention will be described.

  FIG. 5 is a flowchart showing a processing flow of the double-sided stencil printing apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 5, when printing is finished (step S101), more specifically, when printing by the printing units 4 and 5 is finished and placement of the print medium on the paper discharge unit 11 is finished, The drive control unit 20b of the control unit 20 is a discharge fence provided corresponding to the pair of side fences 113, 114 and the end fence 115 so that the pair of side fences 113, 114 and the end fence 115 are tilted. The drive mechanism 130 is driven (step S103). Specifically, the drive control unit 20b tilts by driving the motor 118 (118a, 118b, 118c) and tilting the pair of side fences 113, 114 and the end fence 115 in the Y1 direction shown in FIG. Move to position.

  Next, the determination unit 20a of the control unit 20 determines whether or not the printing paper W has been detected (step S105). Specifically, based on the detection result of the paper presence / absence sensor 122, it is determined whether or not the print paper W is placed on the paper discharge tray 112.

  If it is determined in step S105 that the printing paper W has been detected (YES), the determination unit 20a determines whether or not the start of printing has been requested (step S107). Specifically, it is determined whether or not an operation signal for requesting the start of printing is supplied from the operation unit 15 by a user operation.

  If it is determined in step S107 that the start of printing is not requested (NO), the process proceeds to step S105.

  As described above, when the printing paper W is detected and the start of printing is not requested, the pair of side fences 113 and 114 and the end fence 115 are in the tilted position, so the pair of side fences 113 and 114 and The user can take out the printing paper W placed on the paper discharge tray 112 at any time without manually moving the end fence 115 to the tilt position.

  On the other hand, if it is determined in step S105 that the printing paper W is no longer detected (NO), or if it is determined in step S107 that the start of printing is requested (YES), the control unit 20 The drive control unit 20b uses a discharge fence drive mechanism 130 provided corresponding to the pair of side fences 113, 114 and the end fence 115 so that the pair of side fences 113, 114 and the end fence 115 are in the standing position. Drive (step S109). Specifically, the drive control unit 20b stands up by driving the motor 118 (118a, 118b, 118c) to raise the pair of side fences 113, 114 and the end fence 115 in the Y2 direction shown in FIG. Move to position.

  As described above, when the printing paper W is no longer detected by the paper presence sensor 122, or when the printing paper W is detected by the paper presence sensor 122 but printing is requested, the pair of side fences 113 and 114 are used. Since the paper discharge fence drive mechanism 130 is driven so that the end fence 115 is in the upright position, after the printed printing paper W is taken out or when printing is performed again in preparation for the next printing, The pair of side fences 113 and 114 and the end fence 115 are automatically set to the standing position.

  As described above, according to the double-sided stencil printing apparatus 1 according to an embodiment of the present invention, the placement position on the paper discharge tray 112 is provided on the paper discharge tray 112 and interferes with the printed printing paper W. A pair of side fences 113 and 114 and an end fence 115, and a pair of side fences 113 and 114 and an end fence 115 that can be shifted to a standing position that regulates the position of the printing paper W and a tilting position that does not regulate the placement position of the printing paper W. And a paper discharge fence drive mechanism 130 that drives to a position or an inclined position, so that the user can take out the printed printing paper W without manually moving the paper discharge fence, Printing can be started again.

  In the embodiment of the present invention, the double-sided stencil printing apparatus 1 including the paper discharge fence driving mechanism 130 that drives the pair of side fences 113 and 114 and the end fence 115 to the upright position or the tilted position is taken as an example. Although it has been described, it is not limited to this.

  For example, a paper discharge fence drive mechanism 130 that drives at least one of the pair of side fences 113 and 114 and the end fence 115 to the upright position or the tilted position may be provided.

  In one embodiment of the present invention, the surface of the printing paper (printing medium) is printed by the upstream drum on which the first stencil paper is wound, and the downstream side on which the second stencil paper is wound. The two-drum type stencil printing apparatus 1 that prints the back side of the printing paper with a drum has been described as an example. It may be an apparatus or a laser type image forming apparatus.

1. Double-sided stencil printing device (image forming device)
DESCRIPTION OF SYMBOLS 2 ... Image reading part 3 ... Paper feed part 4 ... 1st printing part 5 ... 2nd printing part 6 ... Plate making part 8 ... 1st discharging part 9 ... 2nd discharging part 10 ... Inversion part 11 ... Paper discharge Unit 15 ... Operation unit 20 ... Control unit 20a ... Determination unit 20b ... Drive control unit 111 ... Paper discharge belt 112 ... Paper discharge table 113, 114 ... Side fence (paper discharge fence)
115 ... End fence (discharge fence)
DESCRIPTION OF SYMBOLS 116 ... Movement unit 117a, 117b ... Roller 118 (118a, 118b, 118c) ... Motor 119 ... Inclination worm gear 120 ... Inclination gear 121 (121a, 121b, 121c) ... Fence collapse detection sensor 122 ... Paper presence sensor (detection means)
130: paper discharge fence drive mechanism

Claims (3)

Printing means for printing on a print medium;
A paper discharge tray on which the printed print medium is placed;
A transition is made between an upright position, which is provided on the paper discharge tray and interferes with the printed print medium and restricts the placement position on the paper discharge stand, and a tilt position which does not restrict the placement position of the print medium. A possible exit fence,
A paper discharge fence drive mechanism for driving the paper discharge fence to be in the standing position or the tilted position;
An image forming apparatus comprising: Drive control means for driving the paper discharge fence drive mechanism so that the paper discharge fence is in the tilted position when printing by the printing means is completed and the placement of the print medium on the paper discharge table is completed;
The image forming apparatus according to claim 1, further comprising: Detecting means for detecting a print medium placed on the paper discharge table;
The drive control means includes
Driving the paper discharge fence drive mechanism so that the paper discharge fence is in the upright position when printing medium is no longer detected by the detection means or when printing start is requested by the printing means. The image forming apparatus according to claim 2.

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