JP2010126269A - Printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing device capable of gradually releasing a sucking action for paper from a paper front edge side in a paper conveying direction without the existence of a mechanical holding means on paper and receiving and delivering paper in a stable state without requiring a suction auxiliary means. <P>SOLUTION: This printing device includes a paper holding body 531 formed into a cylindrical shape rotating around a rotary axial center orthogonal to the paper conveying direction and having a plurality of suction holes 532 on an outer peripheral surface around the rotary axial center, a suction device 54 for sucking paper on an outer peripheral surface of the paper holding body 531 through internal space and the suction holes 532 of the paper holding body 531, and a shutter device having shutters 551A and B at a prescribed position at least one portion around the rotary axial center in the paper holding body 531 and movably provided with the shutters 551A and B over a closing position for closing the suction holes 532 in a region of a prescribed width around the rotary axial center and an opening position for opening the suction holes 532. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a printing apparatus, and particularly relates to a technology of a paper holding mechanism that performs double-sided printing, face-down paper discharge, and the like.

  Conventional printing apparatuses include those shown in FIG. In the apparatus main body 1, a plate making / plate feeding mechanism section 3, a plate discharging mechanism section 4, a sheet feeding mechanism section 5 and a sheet discharging mechanism section 6 are arranged around the plate cylinder 2.

  The plate making / plate feeding mechanism unit 3 feeds the unmade base paper 8 from the master roll 7 and forms it on the base paper 8 by the thermal head 10 based on the image data of the original read by the scanner mechanism unit 9 arranged on the upper part of the apparatus main body 1. The base paper 8 which has been perforated to make a plate is fed to the plate cylinder 2. The plate removal mechanism 4 pulls the base paper 8 between the pair of upper and lower drawing rollers 11 and 12 and winds the base paper 8 with the winding core 13.

  The paper feed mechanism unit 5 takes out the paper 15 placed on the paper feed tray 14 by the paper feed roller 16, and feeds the paper to a position between the base paper 8 and the press roller 19 by the guide roller 17 and the timing roller 18. Then, printing is performed on the paper surface by the rotation of the base paper 8. The paper discharge mechanism 6 peels off the printed paper 15 from the base paper 8 by the paper peeler 20 and discharges it onto the print tray 21.

Prior art documents include those described in Patent Document 1. This is a drum provided with a plurality of suction holes that communicate the internal space with the outside, and the suction medium sucks the print medium through the suction holes and holds the print medium on the drum outer peripheral surface by negative pressure adsorption. The nail | claw of a clamping nail holding means clamps the front-end | tip part of this. Then, after printing, the suction of air by the suction fan is stopped to release the negative pressure suction holding on the print medium, and the mechanical holding by the nail claw holding means is released simultaneously with the release of the negative pressure suction holding.
Japanese Patent Laid-Open No. 10-157229

  However, in Cited Document 1, since the nail of the nail holding means holds the leading end of the print medium, printing cannot be performed on the portion of the printing paper where the nail is hooked, and the entire surface is printed. Causes stains on the paper. In addition, by stopping the suction of air by the suction fan, the negative pressure adsorption holding on the printing medium is released, and at the same time as the negative pressure adsorption holding release is released, the mechanical holding by the clamping claw holding means is released. Since the paper is released simultaneously on the entire surface of the paper, the delivery of the paper to the next process is not stable, and suction assisting means such as electrostatic suction is required.

  The present invention solves the above-mentioned problem, and there is no mechanical holding means on the paper surface, and the suction action on the paper can be gradually released from the front edge side of the paper in the paper transport direction, and the suction auxiliary means It is an object of the present invention to provide a printing apparatus capable of delivering a sheet in a stable state without requiring a printer.

  In order to solve the above problems, a printing apparatus of the present invention includes a printing mechanism unit that prints on a sheet, and a sheet holding mechanism unit that receives a printed sheet discharged from the printing mechanism unit. It has a cylindrical shape that rotates around a rotation axis that is orthogonal to the transport direction, and has a paper holder that has a plurality of suction holes on the outer peripheral surface around the rotation axis, and holds the paper through the internal space and suction holes of the paper holder. A suction device that adsorbs to the outer peripheral surface of the body, and a closed position that has a shutter at at least one predetermined position around the rotation axis in the sheet holding body, and closes the suction hole in a predetermined width area around the rotation axis And a shutter device in which the shutter is movably provided over an open position where the suction hole is opened.

Further, in the printing apparatus of the present invention, the paper holding mechanism unit is rotated by an arbitrarily settable number in a state where the paper is sucked and held by the paper holding body.
In the printing apparatus of the present invention, the shutter device has a plurality of shutters corresponding to the entire inner peripheral surface of the paper holder around the rotation axis of the paper holder.

  In the present invention described above, the shutter device is disposed at the open position while the paper holder rotates about the rotation axis, and the suction device sucks air through the internal space of the paper holder and the suction hole. In this state, when the printed paper discharged from the printing mechanism section reaches the outer peripheral surface of the paper holder, the paper is sucked and held on the outer peripheral surface of the paper holder by receiving a suction action at each suction hole. The paper holder is rotated a predetermined number of times while the paper is sucked and held, thereby promoting drying of the printed paper.

  When the shutter device is arranged at the closing position, the inner peripheral surface of the rotating paper holder passes over the shutter device, and at that time, the shutter device closes the suction hole of the paper holder in a predetermined width area around the rotation axis. Thus, the adsorbing action on the paper is blocked. As a result, the action of adsorbing the sheet adsorbed and held on the outer peripheral surface of the sheet holder is interrupted on the shutter device as the sheet holder rotates, so that the entire sheet is detached from the sheet holder at once. Instead, the parts passing over the shutter device are sequentially detached from the paper holder. At this time, the sheet is maintained in a state where it is adsorbed and held by the sheet holder at the portion remaining on the outer peripheral surface of the sheet holder, so that the sheet can be delivered in a stable state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The overall configuration of the printing apparatus is the same as that shown in FIG. 5, and the same constituent elements will be described with the same reference numerals with reference to FIG.
Referring to FIG. 5, the printing apparatus includes a plate making / plate feeding mechanism unit 3, a plate discharging mechanism unit 4, and a sheet feeding mechanism around a plate cylinder 2 that forms a printing mechanism unit that performs printing on a sheet inside the apparatus main body 1. The unit 5 and the paper discharge mechanism unit 6 are arranged.

  The paper discharge mechanism 6 is provided with a paper holding mechanism 51 shown in FIGS. The paper holding mechanism unit 51 includes a transport mechanism unit 52 that transports the paper 15 discharged from the printing mechanism unit, and a paper holding unit 53.

  There are various structures of the transport mechanism section 52. Here, as shown in FIG. 3, the discharge belt 522 moves on the track surface of the frame metal plate 521, and a suction device disposed inside the transport mechanism section 52. The sheet 15 is sucked through the suction holes (not shown) formed in the frame metal plate 521 by the hole 523 and the suction holes (not shown) formed in the sheet discharge belt 522, and the sheet 15 is conveyed in the sheet conveyance direction by the movement of the sheet discharge belt 522. To do. The paper discharge belt 522 is stretched endlessly between rollers 524 disposed on both sides of the frame metal plate 521.

  The sheet holding unit 53 includes a sheet holding body 531 that rotates around a rotation axis that is orthogonal to the sheet conveyance direction, and driving means (not shown) such as a motor that rotationally drives the sheet holding body 531. The sheet holder 531 has a cylindrical shape with openings at both ends, and has a plurality of suction holes 532 that are opened on the outer peripheral surface around the rotation axis. The suction holes 532 are arranged in a row at a predetermined pitch in the circumferential direction of the paper holder 531 and are arranged in a row at a predetermined pitch in the direction of the rotation axis of the paper holder 531. It communicates with the outside.

  A suction device 54 is provided at one end of the sheet holder 531 in the rotational axis direction. The suction device 54 includes a casing 541 and a fan device 542 attached to the casing 541. The casing 541 has a cylindrical shape having the same diameter as that of the paper holder 531 and is fixed to a fixing member of the printing apparatus. One end opening communicates with the paper holder 531 and the other end forms an exhaust port 543.

  A plurality of shutters 551A and B of the shutter device 55 are disposed inside the paper holder 531. In the present embodiment, the shutters 551A and B are located at two predetermined positions around the rotation axis of the paper holder 531. One shutter 551A is at the downstream position in the paper transport direction and at the upper position, and the other shutter 551B is at the upstream position in the paper transport direction and at the lower position. The shutters 551A and 551B can be arranged in more places, and a plurality of shutters are arranged so as to correspond to the entire inner peripheral surface of the paper holder 531 around the rotation axis of the paper holder 531. It is also possible, and the present invention can be realized if it is arranged at at least one predetermined position around the rotation axis of the paper holder 531.

  The shutters 551A and B have a shape that closes the suction hole 532 in a region having a predetermined width around the rotation axis, and a plurality of openings 552 extending along the circumferential direction of the sheet holding body 531 are formed in the rotation axis direction of the sheet holding body 531. Are provided at a predetermined pitch, and have a closing portion 553 that closes the suction hole 532 between the openings 552.

  As shown in FIG. 2, the shutters 551 </ b> A and 551 B can move in the direction of the rotational axis of the paper holder 531 over a closed position where the suction hole 532 is closed by the closing portion 553 and an open position where the suction hole 532 is opened by the opening 552. Provided.

  3 shows a state in which the shutters 551A and B move in the radial direction of the paper holder 531 in order to clearly represent the closed position and the open position of the shutters 551A and B. In this embodiment, the shutters 551A and 551B move in the direction of the rotational axis of the paper holder 531. However, as shown in FIG. 3, the shutters 551 </ b> A and B may be configured to move in the radial direction of the paper holder 531.

  A driving unit 554 of the shutter device 55 is provided at the other end of the paper holder 531. The driving unit 554 includes a casing 555 and a driving device 556 including a cylinder device and the like. The casing 555 has a cylindrical shape with the same diameter as that of the paper holder 531 and is fixed to a fixing member of the printing apparatus, and closes the opening of the paper holder 531, and the connecting member 557 includes a driving device 556, shutters 551 </ b> A and B, and Are connected.

  On the downstream side of the paper holder 531 in the paper transport direction, a face-up paper receiver 561 is arranged corresponding to one shutter 551A, and the paper holder 531 is located upstream of the paper holder 531 in the paper transport direction. A face-down paper receiver 562 is disposed below the corresponding shutter 551B.

Hereinafter, the operation of the above-described configuration will be described. The printing process in the printing apparatus is the same as that described with reference to FIG. 5, and detailed description thereof is omitted here.
The paper holding mechanism unit 51 is configured so that the paper holding unit 53 rotates the paper holding body 531 around the rotation axis by the driving means, and the shutter device 55 places the shutters 551A and B in the open position by the driving unit 554. Air is sucked through the internal space of the paper holder 531 and the suction hole 532 by driving the device 542.

  In this state, the transport mechanism 52 receives the printed paper 15 discharged from the printing mechanism. The transport mechanism unit 52 sucks the paper 15 onto the paper discharge belt 522 by the suction device 523, and transports the paper 15 toward the paper holder 531 by driving the paper discharge belt 522.

  When the paper 15 reaches the outer peripheral surface of the paper holder 531, the paper 15 is sucked and held on the outer peripheral surface of the paper holder 531 by receiving a suction action at each suction hole 532. Drying of the printed paper 15 is promoted by rotating the paper holder 531 a predetermined number of times while holding the paper 15 by suction. The number of rotations of the paper holder 531 with the paper 15 can be arbitrarily set.

  When the leading edge of the paper 15 reaches a release point set in the vicinity of the shutters 551A and B after the paper holder 531 has rotated a predetermined number of times, the shutter device 55 places the shutters 551A and B in the closed position by the drive unit 554. Then, the blocking portion 553 is made to correspond to the suction hole 532. For example, when the paper 15 is discharged to the face-up paper receiver 561 with the printing paper surface facing upward, the shutter 551A is disposed at the closed position, and the paper 15 is directed to the face-down paper tray 562 with the printing paper surface facing downward. When paper is discharged, the shutter 551A is disposed at the closing position.

The shutters 551A and B may be provided to open and close at the same time, but preferably the shutters 551A and B are provided so as to be able to open and close individually.
When paper is discharged to the face-up paper tray 561, if the inner peripheral surface of the rotating paper holder 531 passes over the shutter 551A of the shutter device 55, the shutter 551A is an area having a predetermined width around the rotation axis. Then, the suction hole 532 of the paper holder 531 is closed to block the adsorption action on the paper 15.

  As a result, the suction action on the paper 15 sucked and held on the outer peripheral surface of the paper holder 531 is blocked by the shutter 551A as the paper holder 531 rotates, so that the paper 15 is entirely at one time. The parts passing through the shutter 551 </ b> A are sequentially detached from the sheet holding member 531 without being separated from the sheet and discharged to the face-up sheet receiver 561.

  At this time, the sheet 15 is maintained in a state where it is adsorbed and held by the sheet holder 531 at a portion remaining on the outer peripheral surface of the sheet holder 531, so that the sheet 15 is delivered to the face-up sheet receiver 561 in a stable state. be able to.

  Similarly, when paper is discharged to the face-down paper tray 562, when the inner peripheral surface of the rotating paper holder 531 passes over the shutter 551B of the shutter device 55, it is sucked and held on the outer peripheral surface of the paper holder 531. The adsorbing action on the sheet 15 is blocked by the shutter 551B as the sheet holder 531 rotates, and the sheet 15 is not separated from the sheet holder 531 at one time, and the parts passing through the shutter 551B are sequentially held by the sheet 551B. The sheet 511 is detached from the body 531 and discharged to the face-down paper receiver 562.

  FIG. 4 shows another embodiment of the present invention, and shows the case of duplex printing. Here, a paper holding mechanism 51 is disposed between the two plate cylinders 2, 2, and the second transport mechanism 60 between the paper holding mechanism 51 and the second plate cylinder 2 downstream in the paper transport direction. A third transport mechanism 61 is disposed downstream of the plate cylinder 2 on the downstream side in the paper transport direction, and a second face-up paper receiver 62 is disposed downstream of the third transport mechanism 61. ing.

  In this configuration, in the case of single-sided printing, the transport mechanism 52 delivers the paper 15 discharged from the first plate cylinder 2 upstream in the paper transport direction to the paper holder 53, and the first face is transferred from the paper holder 53 to the first face. The paper is discharged to the up-sheet receiver 561.

  In the case of duplex printing, the transport mechanism 52 delivers the paper 15 discharged from the first plate cylinder 2 upstream in the paper transport direction to the paper holder 53, and the paper holder 53 faces the print paper surface downward. The sheet is transferred to the second transport mechanism unit 60 in the down state. The second transport mechanism 60 feeds the second plate cylinder 2, and the third transport mechanism 61 discharges the paper 15 discharged from the second plate cylinder 2 to the second face-up paper receiver 62. To do.

  Further, as another embodiment, by continuously arranging a plurality of paper holding mechanism portions 51, it is possible to reverse the paper 15 in an arbitrary direction and discharge it, or to perform duplex printing.

Schematic diagram showing a sheet holding unit in an embodiment of the present invention 4A and 4B are schematic diagrams illustrating the operation of the sheet holding unit in the embodiment, where FIG. 5A is a diagram illustrating an open position of the shutter, and FIG. 2A and 2B are schematic diagrams illustrating a sheet holding mechanism unit according to the embodiment, in which FIG. 2A illustrates a sheet transfer between the transport mechanism unit and the sheet holding unit, and FIG. FIG. 10C is a diagram illustrating the delivery of the paper from the paper holding unit to the face-up paper receipt. Schematic diagram showing another embodiment of the present invention Schematic diagram showing the configuration of a conventional printing device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Plate cylinder 3 Plate making / plate feeding mechanism part 4 Plate discharging mechanism part 5 Paper feed mechanism part 6 Paper discharge mechanism part 15 Paper 51 Paper holding mechanism part 52 Conveying mechanism part 53 Paper holding part 54 Suction apparatus 55 Shutter apparatus 60 1st Second transport mechanism 61 Third transport mechanism 62 Second face-up paper receiver 521 Frame sheet metal 522 Paper discharge belt 523 Suction device 524 Roller 531 Paper holder 532 Suction hole 541 Casing 542 Fan device 551A, B Shutter 552 Opening 553 Blocking portion 554 Driving portion 555 Casing 556 Driving device 557 Connecting material 561 Face-up paper receptacle 562 Face-down paper receptacle

Claims (3)

  A printing mechanism that prints on the paper, and a paper holding mechanism that receives printed paper discharged from the printing mechanism, and the paper holding mechanism has a cylindrical shape that rotates around a rotation axis that is perpendicular to the paper conveyance direction. None, a paper holder having a plurality of suction holes on the outer peripheral surface around the rotation axis, a suction device that adsorbs paper to the outer peripheral surface of the paper holder through the internal space and suction holes of the paper holder, and a paper holding body Has a shutter at at least one predetermined position around the rotation axis, and can move the shutter between a closed position for closing the suction hole and an open position for opening the suction hole in a predetermined width area around the rotation axis. A printing apparatus comprising a shutter device provided.   The printing apparatus according to claim 1, wherein the sheet holding mechanism unit rotates a number of times that can be arbitrarily set in a state where the sheet is sucked and held on the sheet holding body.   The printing apparatus according to claim 1, wherein the shutter device has a plurality of shutters corresponding to the entire inner peripheral surface of the paper holder around the rotation axis of the paper holder.

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