JP2010064812A - Double-sided printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a print surface from being rubbed or set off and to print at high speeds by quickly drying ink even when much ink is transferred onto a paper sheet, in a double-sided printing device capable of printing on the double sides of the paper sheet. <P>SOLUTION: This double-sided printing device 1 includes a first printing means 3 for printing on one surface of the paper sheet, a storage part 4 for storing a plurality of paper sheets printed on their respective one surfaces, a second printing means 5 for printing on the other surface of the paper sheet, a first conveying means 7 for conveying the paper sheet printed on one surface thereof by the first printing means 3 to the storage part 4, and a second conveying means 8 for conveying the plurality of paper sheets stored in the storage part 4 in order to the second printing means 5. The storage part 4 includes a holding mechanism 41 for sucking the other surfaces of the paper sheets printed on their respective one surfaces and holding the paper sheets in the state in which the paper sheets are stacked at predetermined intervals. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a double-sided printing apparatus that performs printing on the front and back surfaces of paper, and more particularly to a double-sided printing apparatus that can ensure the drying time of ink printed on the front surface.

  In recent years, it has been desired to reduce the amount of paper used for printing from the viewpoint of environmental problems, and for this reason, double-sided printing that performs printing on the front and back surfaces of paper has been actively performed. As a double-sided printing apparatus for performing double-sided printing, for example, a double-sided stencil printing apparatus for performing stencil printing has been proposed. As an example of this apparatus, a cylindrical first stencil sheet in which perforated stencil paper is wound around the outer peripheral surface is proposed. The drum and the second drum are arranged adjacent to each other, the first drum performs printing on the surface of the paper, the paper on which the surface is printed is conveyed to the second drum, and the second drum performs printing on the back surface of the paper. There is a device to do.

  In the case of the above-described double-sided printing apparatus, since printing is further performed on the back side of the paper printed on the front side, the front side during printing for printing on the back side after printing on the front side and during printing on the back side The ink printed on the paper may not be sufficiently dried, which may cause the paper to become dirty.

Therefore, there is a double-sided printing apparatus that temporarily stores sheets for which front side printing has been completed on a stacking table for a predetermined time, then transports them in the storing order and prints the back surface, thereby drying ink on the stacking table. It has been proposed (Patent Document 1).
JP 2005-29375 A

  However, the double-sided printing apparatus described in Patent Document 1 stacks sheets of paper whose surface ink has not yet dried on the stacking table, and there is a risk that the sheets will become soiled due to rubbing of the printing surface or set-off. In addition, paper with a lot of ink transferred has high moisture in the paper, so the adhesion of the paper surface becomes high, and multiple sheets are easily transported when picked up and transported one by one. Empty conveyance is likely to occur due to the undulation of the paper.

  The present invention has been made in view of such circumstances, and duplex printing that prevents printing surface rubbing and set-off and allows high-speed printing by quickly drying the ink even on a paper on which a large amount of ink has been transferred. The object is to provide an apparatus.

The duplex printing apparatus of the present invention includes a first printing unit that prints on one side of a sheet,
A storage section for storing a plurality of sheets on which the one side is printed;
Second printing means for printing on the other side of the paper;
First conveying means for conveying a sheet of which one side is printed by the first printing means to the storage unit;
A second transport unit that sequentially transports a plurality of sheets stored in the storage unit to the second printing unit;
The storage unit includes a holding mechanism that holds a plurality of sheets on which the one side is printed in a state in which the other side of each sheet is adsorbed and stacked with a predetermined interval therebetween. To do.

In the double-sided printing apparatus of the present invention, the storage unit transfers the stored paper to the second transport unit, and the carry-in position where the paper transported by the first transport unit is transported. Having a carry-out position at a predetermined interval,
It is preferable that the holding mechanism sequentially attracts the sheets carried into the carry-in position and moves them from the carry-in position to the carry-out position in a state where they are stacked with a predetermined interval.

  In the double-sided printing apparatus of the present invention, the holding mechanism sequentially moves a plurality of suction members, each of which sucks the other surface of the paper, and each suction member from the carry-in position to the carry-out position at a predetermined interval. It is preferable to include a moving means to be moved.

  In the duplex printing apparatus of the present invention, it is preferable that the suction member includes a left suction body that sucks the other surface of the left edge portion of the paper and a right suction body that sucks the other surface of the right edge portion.

  In the double-sided printing apparatus of the present invention, the moving unit moves the suction member along an annular movement path including a movement path portion from the carry-in position to the carry-out position, thereby moving the suction member from the carry-in position to the carry-out position. It is preferable that the head is repeatedly moved toward.

In the double-sided printing apparatus of the present invention, the moving unit includes:
An annular moving body provided with the adsorbing members spaced apart from each other and circulated along the annular movement path;
It is preferable that a moving body drive unit that circulates and moves the annular moving body along the annular moving path is provided.

  It is preferable that the double-sided printing apparatus of the present invention is configured to generate the suction force only when the suction member is located in a moving path portion from the carry-in position to the carry-out position.

  The double-sided printing apparatus of the present invention preferably includes a suction control unit that controls the generation of the suction force of the suction member.

  In the double-sided printing apparatus of the present invention, it is preferable that the suction control unit generates the suction force only on the suction member where the paper to be sucked exists.

In the double-sided printing device of the present invention, when the suction control unit causes an error in transporting the paper outside the storage unit, the generation of the suction force in the suction member is continued.
It is preferable that when the conveyance error of the paper occurs in the storage unit, the generation of the suction force in the suction member is stopped.

  In the double-sided printing apparatus according to the aspect of the invention, it is preferable that the holding mechanism holds the plurality of sheets in a standing state with a predetermined interval therebetween.

The double-sided printing apparatus of the present invention includes a first suction unit that the first transport unit carries in the storage unit while sucking the paper, and / or the second transport unit sucks the paper. While having a second suction part to be carried out from the storage part,
It is preferable that the apparatus includes a peeling unit that peels the sheet sucked by the first suction unit and / or the second suction unit from the suction unit.

  The double-sided printing apparatus of the present invention is a feed control means for causing the moving body driving means to intermittently feed the annular moving body by one pitch, and for causing the peeling means to perform a peeling operation in synchronization with the intermittent feeding of the annular moving body. It is preferable to provide.

  According to the double-sided printing apparatus of the present invention, the storage unit that stores a plurality of sheets on which one side is printed attracts the other side of each sheet, and holds the sheets in a state of being stacked with a predetermined interval therebetween. The printing surface can be dried by holding and storing multiple sheets of paper without bringing the printed surface, i.e., the surface on which the ink has been transferred, into contact with other paper. In addition, it is possible to prevent rubbing and set-off and to dry the ink quickly even on a paper on which a large amount of ink has been transferred, thereby enabling high-speed printing.

  Hereinafter, a double-sided stencil printing apparatus 1 according to a first embodiment of the present invention will be described in detail with reference to the drawings. 1 is a schematic configuration diagram of a double-sided stencil printing apparatus 1 according to the first embodiment, FIG. 2 is a detailed enlarged view of a main part of the double-sided stencil printing apparatus 1 of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA in FIG. 4 is a detailed view of a main part viewed from the direction of arrow B in FIG. 2, FIG. 5 is a schematic view viewed from the direction of arrow U1 in FIG. 4, and FIG. 6 is a detailed enlarged view of the main part viewed from the direction of arrow U2 in FIG. is there. 3, 4, and 6, some of the suction plates 42 are not shown. In FIG. 2, illustration of a part of the suction plates 42 including the suction plates that receive the loaded paper P <b> 2 is omitted.

  As shown in FIG. 1, a double-sided stencil printing apparatus 1 of the first embodiment is provided on an apparatus housing 10 and one side surface (left side surface in FIG. 1) of the apparatus housing 10, and a plurality of sheets as print media. The sheet feeding table 2 on which P1 is loaded, the first stencil printing unit (first printing means) 3 for printing on one surface A of the sheet P1 fed from the sheet feeding table 2, and the one surface A are printed. A storage section 4 that stores a plurality of sheets of paper P2, a second stencil printing section (second printing means) 5 that prints on the other surface B of the paper P2 stored in the storage section 4, and the other of the apparatus housing 10 A paper discharge tray 6 is provided on a side surface (the right side surface in FIG. 1), and stacks sheets P3 on which both sides, that is, one side A and the other side B are printed.

  The double-sided stencil printing apparatus 1 also includes a first transport unit (first transport unit) that transports the sheets P1 and P2 from the paper feed tray 2 to the first stencil printing unit 3 and from the first stencil printing unit 3 into the storage unit 4. A second conveying unit (second conveying unit) that conveys the sheets P2 and P3 from the inside of the storage unit 4 to the second stencil printing unit 5 and from the second stencil printing unit 5 to the paper discharge tray 6. ) 8.

  The first transport unit 7 is provided in the apparatus housing 10, and as shown in FIGS. 1 and 2, a first pickup roller 71 provided above the apparatus housing 10 side of the sheets P 1 stacked on the sheet feeding table 2. The first timing roller 72 that conveys the paper P1 picked up by the first pickup roller 71 to the first stencil printing unit 3 at a predetermined timing, and the one surface A positioned on the upper side by the first stencil printing unit 3 A first conveying device 73 that conveys the printed paper P2 obliquely downward (lower right in FIG. 1 and FIG. 2) along an arcuate locus, and the paper P2 that is conveyed by the first conveying device 73. Furthermore, it is schematically configured by a second transport device 76 that transports obliquely downward and a carry-in device 74 that transports the paper P2 transported by the second transport device 76 into the storage unit 4 and attracts it to the suction moving unit 41 described later. Been That.

  The second transport unit 8 is also provided in the apparatus housing 10, and as shown in FIGS. 1 and 2, a carry-out device 81 that receives and carries out paper P2 from a suction member 41 (described later) inside the storage unit 4, and a carry-out device 81. The second pickup roller 82 that picks up the paper P2 carried out by the second pickup roller 82, and the paper P2 picked up by the second pickup roller 82 is reversed along an arcuate locus so that the one surface A is positioned on the lower side. The second timing roller 83 transported to the second stencil printing unit 5 at the timing and the paper P3 on which the other surface B is printed by the second stencil printing unit 5, that is, both sides are printed on the paper discharge table 6. It is schematically configured with a discharge device 84 that carries it out.

  The carry-in device 74, the second transport device 76, the carry-out device 81, and the discharge device 84 each have a pair of pulleys 74a, 76a, 81a, and 84a and a pair of pulleys 74a, 76a, 81a, and 84a that are arranged at predetermined intervals. Are provided with annular conveying belts 74b, 76b, 81b, 84b that move around the rotation of pulleys 74a, 76a, 81a, 84a, and suction fans 74c, 76c, 81c, 84c. Yes.

  The transport belts 74b, 76b, 81b, 84b have a plurality of holes 74b'76b ', 81b', 84b '(76b', 81b ', 84b' not shown) on the surface, for example, like the transport belt 74b shown in FIG. ), And the conveyor belts 74b, 76b, 81b, 84b and the pulleys 74a, 76b, 81a, 84a are at least the holes 74b ′ of the conveyor belts 74b, 76b, 81b, 84b positioned on the paper P side. Only a part including 76b ′, 81b ′, and 84b ′ is exposed to the outside, for example, in a substantially sealed case 74d, 76d, 81d, and 84d (76d and 84d are not shown) as shown in FIG. It is arranged.

  The fans 74c, 76c, 81c, and 84c are attached to the cases 74d, 76d, 81d, and 84d, and the conveyor belts 74b, 76b, and 81b are discharged by discharging the air inside the cases 74d, 76d, 81d, and 84d to the outside. , 84b, a suction force is generated in the holes 74b ', 76b', 81b ', 84b'.

  The devices 74, 76, 81, 84 configured in this manner move the conveyor belts 74b, 76b, 81b, 84b by rotating pulleys 74a, 76a, 81a, 84a by a motor (not shown) and fans 74c, 76c. , 81c and 84c are rotated to generate suction force in the holes 74b ′, 76b ′, 81b ′ and 84b ′, thereby transporting the paper P while sucking it.

  Further, as shown in FIG. 2, the first transfer device 73 includes three pulleys 73a disposed along an arcuate locus, one pulley 73a disposed in the vicinity of the three pulleys 73a, and four pulleys 73a. An annular conveyor belt 73b that is stretched around the outer periphery of one pulley 73a and moves with the rotation of the pulley 73a, and a suction fan 73c are provided, and substantially the same as the conveyor devices 74, 76, 81, and 84 described above. It is configured.

  The carry-in device 74, the second transport device 76, the carry-out device 81, the discharge device 84, and the first transport device 73 of the present embodiment are configured as described above. For example, the transport belts 73b, 74b, 76b, 81b, and 84b Fans 73c, 74c, 76c, 81c, and 84c may be attached to the inner surface for suction, or any structure may be used as long as the paper P can be conveyed.

  Further, the carry-in device 74 may be provided with a plurality of conveyance belts 74b and fans 74c stretched around the pair of pulleys 74a in parallel so as to suck and convey one sheet of paper. The second transfer device 76, the carry-out device 81, and the discharge device 84 can be similarly configured.

  As shown in FIG. 1, the first stencil printing unit 3 includes a first drum 31 and a first press roller 32. The first stencil printing unit 3 peels off the paper P2 on the downstream side of the first drum 31 as shown in FIG. A catch nail 33 is provided. The first drum 31 has a first ink cartridge (not shown) inside, and a stencil sheet that has been thermally perforated by a plate making unit (not shown) on the outer peripheral surface of the first drum 31, that is, has been made. M1 is wound. Then, the upper surface A located on the one surface A, that is, the upper side of the sheet P1 fed between the first drum 31 and the first press roller 32 in synchronization with the rotation of the first drum 31 by the first timing roller 72 is the first press. By being pressed against the stencil sheet M1 by the roller 32, stencil printing is performed on one side A of the sheet P1.

  Similar to the first stencil printing unit 3, the second stencil printing unit 5 includes a second drum 51 and a second press roller 52. The second stencil printing unit 5 peels off the paper P 3 on the downstream side of the second drum 51. A catch nail 53 is provided. The second drum 51 has a second ink cartridge (not shown) inside, and a stencil sheet M2 that has been stenciled is wound around the outer peripheral surface of the second drum 51. Then, after one surface A is printed and further conveyed by the first conveyance device 73 and the second conveyance device 76, the second drum is synchronized with the rotation of the second drum 51 by the second timing roller 83 through the storage unit 4. The other surface B of the paper P2 fed between the first press roller 52 and the second press roller 52, that is, the upper surface B positioned on the upper side is pressed against the stencil sheet M2 by the second press roller 52, and thus against the other surface B of the paper P2. Stencil printing is performed.

  The storage unit 4 temporarily stores a plurality of sheets of paper P2 on which one side A is printed by the first stencil printing unit 3 before printing on the other side B of the paper P2 by the second stencil printing unit 5. What is characteristic in the present invention is that the storage unit 4 holds the plurality of sheets of paper P2 in a state where the other surface B of each sheet P2 is adsorbed and stacked at a predetermined interval. A holding mechanism.

  The storage unit 4 has a predetermined interval between a carry-in position where the paper P2 conveyed by the first conveyance unit 7 is carried in and a carry-out position where the stored paper P2 is delivered to the second conveyance unit 8. A holding mechanism that adsorbs the other surface B of each sheet P2 carried one by one to the carry-in position and moves it from the carry-in position to the carry-out position in a state of being stacked at a predetermined interval, It is preferable that the sheet can be unloaded one by one from the unloading position and used for printing on the other surface B.

  As shown in FIG. 1, the storage unit 4 in the present embodiment includes a carry-in port for the paper P <b> 2 sent from the first transport unit 7 and a carry-out port for the paper P <b> 2 that delivers the paper P <b> 2 to the second transport unit 8. As shown in FIG. 5, it is disposed obliquely upward, and the one side A that has been loaded is positioned on the diagonally upper side (right side in FIG. 2) with the printed side of the printed paper P <b> 2 left and right as shown in FIG. 5. A holding mechanism is provided that adsorbs both side edges and holds the plurality of sheets in a state of being stacked with a predetermined interval therebetween.

  As shown in FIGS. 2, 3, and 4, the holding mechanism of the present embodiment includes a support plate 40a that is a support that supports the central portion of the other unprinted surface B of the paper P2 from obliquely below, and printing of the paper P2. The left and right sides of the cover plate 40b that covers the one surface A obliquely from above and a plurality of sheets of paper P2 are sequentially supported in the order of loading with the respective side edges adsorbed and spaced apart from each other (FIG. 4, FIG. 5, the suction movement unit 41 is provided with the left side of the drawing as the left and the right side as the right.

  2 and 3, the support plate 40a includes the case 74d of the carry-in device 74 and the case 76d (not shown) of the first transfer device 76, and the cover plate 40b includes the carry-out device 81 described above. A case 81d is attached, and the conveyor belts 74b, 76b, and 81b are exposed from openings (not shown) provided in the support plate 40a and the cover plate 40b, respectively.

  As shown in FIG. 4, the suction moving unit 41 is provided on both sides in the left-right direction (a direction perpendicular to the loading direction D of the paper P <b> 2 indicated by the arrow D in FIG. 4) across the paper P <b> 2 to be loaded. Each suction moving unit 41 has a plurality of suction plates 42, which are examples of suction bodies respectively disposed at positions corresponding to the left or right edge of the paper P2, and each suction plate 42 with a predetermined interval therebetween. A moving unit 43 that sequentially moves from the carry-in position to the carry-out position, that is, in the conveyance direction of the paper P2 (in the direction of arrow F in FIG. 4; hereinafter referred to as the conveyance direction F). A pair of left and right suction plates 42 for sucking one sheet of paper P2 carried in constitutes one suction member.

  As shown in FIG. 4, the moving unit 43 is provided on both the left and right sides of the paper P2, and a pair of pulleys 43a arranged at a predetermined interval in the transport direction F of the paper P2 and the outer periphery of the pair of pulleys 43a. A conveying belt 43b as an example of an annular conveying moving body that is stretched and moves with the rotation of the pulley 43a is provided at predetermined intervals in the loading direction D, that is, vertically.

  The upper and lower pulleys 43a are connected to each other by a shaft 43a ', and are driven synchronously by a motor (not shown), and the motor, a pair of upper and lower pulleys 43a and a shaft 43a' drive the moving belt 43b in a circular fashion. Functions as a means.

  As shown in FIGS. 4 and 5, the suction plate 42 is formed in a rectangular shape, for example, having a length substantially equal to the length in the longitudinal direction of the paper P <b> 2 so as to correspond to the length of the paper P <b> 2 to be carried in. Each suction plate 42 is disposed so that the longitudinal direction of the suction plate 42 is substantially parallel to the loading direction D of the paper P2, that is, the longitudinal direction is the vertical direction in FIGS. Yes.

  Each suction plate 42 is attached to the conveying belt 43b with a predetermined interval at each side edge, and a moving path from the loading position of the paper P2 to the unloading position as the conveying belt 43b moves. It moves repeatedly along the annular movement path including the portion (R portion in FIG. 3). In this embodiment, as shown in FIG. 3, the linearly located portion inside the conveyance belt 43b (the side into which the paper P2 is carried) is defined as the movement path portion R, and the movement path portion R is the most in the conveyance direction F. The upstream side is set to the carry-in position C1 where the paper P2 is carried in, and the most downstream side is set to the carry-out position C2 where the paper P2 is carried out.

  Each suction plate 42 includes a front plate 42b in which a plurality of holes 42a are formed over substantially the entire region, and the front plate 42b of the front plate 42b is located upstream in the transport direction F when the front plate 42b is positioned in the moving path portion R. The back plate 42d is joined to the facing surface K, covers the lower half of the surface K, and forms a suction bag 42c having an open lower end.

  Below the suction plate 42 located in the movement path portion R, a suction fan part 44 described later is provided, and the suction fan part 44 sucks air inside the suction bag 42c from the lower end opening of the bag 42c. The suction force is generated on the other surface J of the front plate 42b of the suction bag 42c by generating a suction force in the hole 42a of the suction bag 42c. The hole 42a positioned above the suction bag 42c has a role of reducing resistance (contact resistance) generated when the other surface J of the front plate 42b and the other surface B of the paper P2 come into contact with each other. In FIG. 3, the sheet P2 is not in contact with the other surface J of the front plate 42b of each suction plate 42, but the other surface B of the sheet P2 is actually in contact.

  As shown in FIGS. 4 and 6, the suction fan 44 is attached to the suction case 44a connected to the lower end opening of the suction bag 42c and the suction case 44a, and discharges the air inside the suction case 44a to the outside. Suction fan 44b. An opening 44a 'is provided on the upper surface of the suction case 44a, and the inside of the suction case 44a and the inside of the suction bag 42c are formed to communicate with each other through the opening 44a'.

  In the present embodiment, as shown in FIG. 4, the opening 44a ′ is positioned only in a range corresponding to a moving path portion (R portion in FIG. 3) from the carry-in position to the carry-out position of the paper P2. The width of the opening 44a ′ in the direction orthogonal to the longitudinal direction is formed to be substantially the same as the width of the lower end opening of the suction bag 42c.

  Further, at the lower end portion of the front plate 42b of each suction plate 42 arranged at a predetermined interval, as shown in FIG. 6, when the suction plate 42 is positioned above the opening 44a ′, the lower end of the suction bag 42c. A lid 42e for closing the portion of the opening 44a 'located between the suction plates 42 is provided so that only the opening faces the opening 44a'. The suction fan 44b is always driven, and a suction force is always generated in the suction bag 42c portion of the suction plate 42 located at the opening 44a '.

  In the present embodiment, the above-described configuration is adopted from the viewpoint of downsizing the suction case 44a. However, the present invention is not limited to this, and for example, the opening 44a ′ of the suction case 44a is formed in an annular shape of the transport belt 43b. It may be formed in an annular shape so as to be positioned at the lower ends of all the suction plates 42 disposed on the entire circumference of the moving path, or can be changed as appropriate.

  In the suction moving unit 41 configured as described above, the one surface A on which the paper P2 is printed is disposed obliquely above (the right side in FIG. 2 and the upper side in FIG. 3) between the two suction plates 42 that are located across the carry-in position C1. When the sheet P2 is inserted in this state, the left and right suction plates 42 are positioned on the upstream side in the transport direction F with respect to the other surface B of the left and right side edges of the sheet P2 as shown in FIG. When it is brought into contact with the other surface J and supported by the other surface J, and is carried in the loading direction D by the loading device 74 and is positioned at the suction bag 42c portion of the suction plate 42 as shown in FIG. The other surface B of the paper P2 is attracted to the other surface J of the suction plate 42 by the suction force generated as described above.

  By setting the suction force generated in the hole 42a of the suction bag 42c portion of the suction plate 42 to be smaller than the suction force generated in the hole 74a ′ of the transport belt 74b of the carry-in device 74, the paper P2 is applied to the suction plate 42. Even if a portion is adsorbed, it can be transported to a predetermined position by the transport belt 74 of the transport device 74.

  When the conveying belt 43b of the moving unit 43 moves in the conveying direction F by one sheet of the suction plate 42, that is, by one pitch by a motor (not shown), the paper P2 is peeled off from the conveying belt 74b of the carry-in device 74 and left and right suction plates 42 are left. It is moved by one pitch in the transport direction F together with the suction plate 42 while being sucked by the suction plate. At this time, a member for pushing out the paper P2 is provided in the vicinity of the carry-in device 74, and the paper P2 is pushed out by this member almost simultaneously with the movement of the transport belt 43b, so that the paper P2 is peeled off from the transport belt 74b.

  Next, the next paper P2 is carried in by the carry-in device 74 between the two suction plates 42 newly positioned with the carry-in position C1 interposed therebetween, and the carried-in paper P2 is moved upstream in the conveyance direction F in the same manner as described above. It is adsorbed by the left and right adsorbing plates 42 and moves in the conveying direction F along with the movement of the conveying belt 43b. In this way, every time the conveying belt 43b moves by one pitch, the same operation as described above is repeatedly performed, and the sheets P2 are sequentially carried in.

  When the paper P2 sucked by the suction plate 42 by the further movement of the transport belt 43b in the transport direction F is positioned at the carry-out position C2, the carry-out device 81 sucks the paper P2 and peels the paper P2 from the suction plate 42. The paper P2 is unloaded. The suction force generated in the suction plate 42, that is, the suction force generated in the hole 42a of the suction bag 42c is set to be smaller than the suction force generated in the hole 81a ′ of the transport belt 81 of the carry-out device 81. The apparatus 81 can transport the paper P2 even if the paper P2 is sucked by the suction plate 42. Then, every time the transport belt 43b moves by one pitch, the unloading device 81 sequentially peels and unloads the paper P2 from the suction plate 42 that has arrived at the unloading position C2. The carry-out device 81 sucks one side A of the paper P2 and conveys it toward the second pickup roller 82.

  In this way, the storage unit 4 holds a plurality of sheets of paper P2 on which one side A is printed in a state where they are stacked with a predetermined interval therebetween, so that the printed surface is rubbed and the paper P2 is smeared due to setback. Can be prevented. Further, while the transport belt 43b moves from the carry-in position C1 to the carry-out position C2, the printed surface, that is, the first surface A does not come into contact with the other paper P2, so that the ink can be efficiently dried.

  Further, when the paper P2 is peeled off from the suction plate 42 and carried out at the carry-out position C2, the plurality of papers P2 are stored with a gap one by one, so that the multiple conveyance of the paper P2 is prevented. There is no need to provide a tearing mechanism for peeling off the adhesion of the surface of the paper P2. As a result, it is possible to prevent the paper P2 from being stained due to the rubbing of the printing surface when the paper P2 is being rolled by the winding mechanism.

  Further, since the sheet P2 in the storage unit 4 is conveyed from the carry-in position C1 to the carry-out position C2 with both side edges adsorbed by the suction plates 42 on both the left and right sides, the paper P2 is simply dropped by its own weight. As compared with the case where the paper P2 is stacked, the positional accuracy of the paper P2 at the carry-out position C2 can be ensured.

  Further, the sheet P2 inside the storage unit 4 is adsorbed on the unprinted surface, that is, the other surface B of the sheet P2 by the suction plates 42 on both the left and right sides. Therefore, it is possible to perform full surface printing (borderless printing) for printing on the entire sheet P2.

  In addition, since the holding mechanism of the storage unit 4 of the present embodiment adsorbs both side edges of the other surface B of the paper P2, even if the paper is easily bent due to a curved end portion, the paper bends. For example, even when the amount of ink transferred to the first surface A is relatively large and the moisture in the paper P2 is high, the paper P2 absorbs moisture. Curl with a curved cross section in the up-down direction, that is, curl along the transport direction of the paper P2, is less likely to occur, so that the paper P2 is jammed in the transport path caused by the curl along the transport direction of the paper P2. Occurrence can be prevented, and even a sheet on which one side is printed can be stably conveyed. Therefore, the double-sided stencil printing apparatus 1 can cope with printing with high-speed paper feeding.

  Moreover, since the suction fan part 44 is arrange | positioned under the adsorption | suction board 42 as mentioned above in the holding mechanism of the storage part 4 of this embodiment, since the suction fan part 44 is not located between adsorption | suction boards 42. In addition, since the gap between the suction plates 42 can be narrowed and a large number of suction plates 42 can be arranged in a predetermined space, a space for storing a predetermined number of sheets P2 can be reduced, and the apparatus can be made compact. Can be realized.

  In the present embodiment, the suction moving unit 41 is configured as described above, but the suction moving unit 41 is not limited to this, and the other surface B of the paper P2 is sucked and sequentially moved from the carry-in position C1 to the carry-out position C2. Any structure may be used as long as it can be conveyed toward the vehicle.

  Next, a series of operations of the double-sided stencil printing apparatus 1 of the present embodiment configured as described above will be described. Each operation is performed according to an instruction from a control unit (not shown) provided in the apparatus housing 10.

  In the double-sided stencil printing apparatus 1, as shown in FIG. 1, the pick-up roller 71 sequentially picks up the paper P1 stacked on the paper feed tray 2, and the first timing roller 72 sequentially picks up the picked-up paper P1. The first stencil printing unit 3 rotates the first drum 31 one time while pressing the conveyed paper P1 one by one against the first drum 31 by the first press roller 32. On the upper surface A, images of the pre-made stencil sheet M1 wound around the first drum 31 are sequentially printed.

  Next, the first transport device 73 sequentially transports the printed paper P2 with one printed surface A on the upper surface along an arcuate path while sucking the other surface B, and then the second transport device 76 performs the other surface. While sucking B, it is transported toward the storage unit 4. As shown in FIGS. 2 and 4, the paper P <b> 2 sequentially transported by the second transport device 76 is lowered into the storage portion 4 while the carry-in device 74 sucks the lower surface, that is, the central portion of the other surface B in the left-right direction. Carry in sequentially.

  The paper P2 carried into the storage unit 4 by the carry-in device 74 is inserted between the adsorbing plates 42 adjacent to each other with the carry-in position C1 sandwiched between the adsorbing movement units 41 on the left and right sides as shown in FIGS. Is done. At this time, a motor (not shown) intermittently feeds the suction plate 42 in synchronization with the carry-in of the paper P2 by the carry-in device 74, and waits in a state where the other surface J of the suction plate 42 is stopped at the carry-in position C1. Since the pulley 43a is rotated so as to feed one pitch at the timing when both side edges are adsorbed by the suction plate 42, the sheets P2 carried into the carry-in position C1 are sequentially adjacent to each other across the carry-in position C1. It is inserted between the two suction plates 42 and then moved in the movement direction F.

  At this time, the suction moving portions 41 on both the left and right sides suck the side edge portion of the paper P2 carried between the adjacent suction plates 42 at the carry-in position C1, and the carrying belt 43b moves in the carrying direction F and the carry-in device 74. Since the paper P2 is peeled from the transport belt 74b, a plurality of papers P2 sequentially carried into the carry-in position C1 can be sucked by the suction plate 42 one by one.

  When the plurality of sheets P2 sucked one by one by the suction plate 42 are positioned at the unloading position C2 by the movement of the transport belt 43b, the unloading shown in FIG. 2 is performed in synchronization with the arrival of the sheet P2 at the unloading position C2. By rotating the pulley 81a of the apparatus 81 by a motor (not shown), the lower surface of the sheet P2, that is, the entire surface A is sucked by the unloading apparatus 81 and peeled from the suction plate 42, and the sheet P2 is directed toward the second stencil printing unit 51. Are carried out. The fan 81c of the carry-out device 81 is always driven.

  At this time, the paper P2 can dry the ink transferred to the first surface A during the time required to move from the carry-in position C1 to the carry-out position C2, that is, the storage time in the storage unit 4, so When A is sucked and transported, it is possible to prevent one surface of the paper P2 from being soiled by contact with the transport belt 81b.

  Note that, based on the printing rate of one side A of the paper P2, that is, when the ratio of the actual printing area in the one side A to the entire area of the one side A is high, the ink is transferred to the first side A, so the storage time is lengthened. However, when the ratio of the actual printing area is low, the transfer time may be controlled so as to shorten the storage time because there is little transfer of ink to the first surface A. This printing rate means the ratio of the actual printing area to the entire area of one side A of the paper P2. For example, in the case of stencil printing, a monochrome binary image representing an image to be printed by the first stencil printing unit 3 It can be expressed as a ratio of the number of black image data to the total number of image data (black image data is image data for punching a stencil sheet and white image data is data for not punching a stencil sheet).

  The storage time is controlled by calculating the printing rate in the first stencil printing unit 3 as described above before starting double-sided printing, and comparing the drying time when the printing rate is equal to or less than a predetermined value. If it is sufficient, the sheet P2 is adsorbed to, for example, every other adsorption plate 42 by doubling the moving speed of the conveying belt 43b, that is, the moving speed of the sheet P2, as compared with the case shown in FIG. So that The moving speed of the conveyor belt 43b can be changed by changing the rotational speed of the pulley 43a by controlling a motor (not shown).

  When the moving unit 43 is driven so as to attract the paper P2 to every other suction plate 42 as described above, the conveyance speed of the paper P2 increases, and thus the time for the paper P2 to be stored in the storage unit 4 is short. Thus, when the printing rate is low, it is possible to omit the useless drying time and carry out the paper P2 from the carry-out position C2.

  Further, as described above, the moving speed of the conveyor belt 43b can be changed only by controlling the motor, so that the storage time, that is, the drying time can be controlled without requiring complicated control.

  As described above, after the unloading device 81 unloads the paper P2 from which the ink transferred to the first surface A in the storage unit 4 is dried, the second pickup roller 82 is unloaded from the unloading device 81. Are sequentially picked up, and the second timing roller 83 inverts the picked-up paper P2 so that the printed one side A is located on the lower side, that is, the unprinted other side B is located on the upper side. It is sequentially conveyed to the second stencil printing unit 5 at the timing. The second stencil printing unit 5 sequentially prints images of the stencil sheet M2 that has been wound around the second drum 51 on the upper surface, that is, the other surface B of the conveyed paper P2.

  Subsequently, the discharge device 84 sequentially conveys the paper P3 having the printed other side B as the upper surface to the discharge table 6 while sucking the one side A.

  Next, another embodiment will be described. The double-sided stencil printing apparatus of the following embodiment includes a suction control unit that controls the generation of the suction force of the suction plate 42 in the suction fan unit 44 of the first embodiment described above. FIG. 7 is a detailed cross-sectional view of the main part of the suction moving part 41 of the second embodiment, and FIG. 8 is a detailed cross-sectional perspective view of the main part of the suction moving part 41 of the third embodiment.

  The suction moving portion 41 of the second embodiment includes a shutter portion 44c, and the shutter portion 44c is disposed inside the suction case 44a as shown in the left and right views of FIG. 7 in the conveying direction F of the conveying belt 43b. A pair of pulleys 44c-1 arranged at a predetermined interval (one pulley 44c-1 is not shown in the figure) and a pair of pulleys 44c-1 are wound around the outer periphery and moved as the pulley 44c-1 rotates. An annular conveying belt 44c-2 and a fitting member 44c-3 provided on a part of the outer peripheral surface of the conveying belt 44c-2 and having fitting teeth on the surface thereof. The fitting member 44c-3 moves annularly with the movement of the transport belt 44c-2.

  The shutter portion 44c is disposed below the opening 44a ′ inside the suction case 44a, and is located when the suction plate 42 is located above the opening 44a ′, that is, at the moving path portion R (see FIG. 3). Sometimes, each space 44c-4a surrounding the lower end opening of each suction bag 42c of the suction plate 42 is in contact with the lid 42e and communicates with the lower end opening of each suction bag 42c through the opening 44a '. The space forming member 44c-4 to be formed is provided, and the space forming member 44c-4 has a lower end opened for each space 44c-4a. The shutter portion 44c further includes a shutter 44c-5 that opens and closes the lower end of the space forming member 44c-4 for each of the spaces 44c-4a.

  As shown in the left and right views of FIG. 7, the shutter 44c-5 includes lids 44c-5a that open and close the lower end of the space forming member 44c-4 for each space 44c-4a, and the fitting member 44c- 3 and a rotating dial 44c-5b having a fitting tooth to be fitted, and the lid 44c-5a is connected to a rotating shaft of the rotating dial 44c-5b, and the rotating shaft 44c-5b is rotated with the rotation of the rotating dial 44c-5b. Rotate around.

  The shutter portion 44c configured as described above has the same length of the fitting member 44c-3 as the conveying direction F for the same length every time the conveying belt 43b of the moving portion 43 moves by one pitch in the conveying direction F. The conveyor belt 44c-2 is moved via the pulley 44c-1 by a motor (not shown) so as to proceed in the direction F '. As a result, the fitting member 44c-3 advances in the direction F 'in a state where the fitting teeth of the fitting member 44c-3 and the rotary dial 44c-5b are fitted, so that the rotary dial 44c-5b is an arrow in FIG. The cover body 44c-5a is also rotated 90 degrees in the M direction and the cover body 44c-5a is also rotated 90 degrees, so that the cover body 44c-5a is opened and the lower end of the space forming member 44c-4 is opened. .

  When the sheet P2 is not yet carried into the storage section 4 by the suction control section (suction control means) (not shown), the shutter section 44c configured as described above is shown in the left diagram of FIG. As shown in the drawing, when the sheet P2 first fed by the first pickup roller 71 and printed on the first surface A by the first stencil printing unit 3 is inserted into the carry-in position C1, the sheet P2 is inserted. The lid 44c-5a on the most upstream side in the transport direction F that closes the space 44c-4a communicating with the suction bag 42c of the suction plate 42 that sucks the sheet P2 to be sucked is opened as described above. An optical sensor (not shown) that detects whether or not there is a sheet P2 in the conveyance path of the first conveyance unit 7 and upstream of the carry-in port of the storage unit 4 is provided. When detected, the most upstream lid 44c-5a is opened.

  Then, the suction control unit moves the conveyance belt 44c-2 of the shutter unit 44c in conjunction with the next movement of the conveyance belt 43b of the movement unit 43, thereby moving the paper P2 inserted first in the conveyance direction F. With the movement, the lid 44c-5a at the lower end where the paper P2 is located is opened, and after all the lids 44c-5a are opened, the fitting member 44c-3 is positioned on the most upstream side in the transport direction F. The conveyor belt 44c-2 is further moved until it is positioned in the vicinity of the upstream side of the space 44c-4a to be moved, and then the motor that drives the conveyor belt 44c-2 is stopped.

  Then, the adsorption control unit feeds a predetermined number of sheets P1 from the sheet feeding table 2, sequentially prints one side A of the sheet P1 by the first stencil printing unit 3, and finally prints it by the first stencil printing unit 3. The loaded paper P2 is carried into the storage unit 4 along the suction plate 42 by the carry-in device 74 at the carry-in position C1, and the motor is driven almost simultaneously when the conveyance belt 43b of the moving unit 43 moves by one pitch in the conveyance direction F. Then, the cover belt 44c-5 is closed by the fitting member 44c-3 by moving the transport belt 44c-2. Similarly, the transport belt 43b of the moving unit 43 sequentially moves in the transport direction F by one pitch. Each time the conveyor belt 44c-2 is moved, all the lids 44c-5 are closed.

  Whether or not the paper P2 carried into the storage unit 4 is the predetermined number of the last paper P2 is determined based on whether or not the paper P2 is in the transport path between the first pickup roller 71 and the first timing roller 72. An optical sensor (not shown) that detects whether or not there is provided is provided, and the adsorption control unit makes a determination by counting the output signals from the optical sensor.

  As described above, the suction force is generated only on the suction plate 42 in which the paper P2 is carried in, thereby preventing the reduction of the suction force due to air suction from the holes 42a of the suction plate 42 in which the paper P2 is not carried in. it can.

  The suction moving portion 41 of the third embodiment includes another shutter portion 44d, and the shutter portion 44d includes a space forming member 44d-1 below the opening 44a ′ inside the suction case 44a as shown in FIG. ing. The space forming member 44d-1 surrounds the lower end opening of the suction bag 42c of the suction plate 42 every predetermined number (five in the present embodiment) where the suction plates 42 are located above the opening 44a ′. Each of the spaces 44d-1a enclosing and contacting the lid 42e and communicating with the lower end openings of the predetermined number of suction bags 42c through the openings 44a 'is defined. The space forming members 44d-1 Each space 44d-1a is provided with a suction opening communicating with the space 44d-1a. The shutter portion 44d further includes a shutter 44d-2 that opens and closes the suction opening of the space forming member 44d-1 for each space 44d-1a.

  As shown in FIG. 8, the shutter 44d-2 has a plurality (six in this embodiment) of openings 44d-2a, and two disks 44d-2b and two disks arranged in an overlapping manner. A motor (not shown) that rotates one of 44d-2b around the axis of the disk 44d-2b. The shutter 44d-2 opens and closes the suction opening by rotating one of the disks 44d-2b by the motor and overlapping or shifting the openings 44d-2a of the two disks 44d-2. To do.

  The second shutter portion 44d is provided with two disks 44d− when a sheet P2 is not yet carried into the storage portion 4 by a suction control portion (suction control means) (not shown), as in the second embodiment. 2 is closed by shifting each of the openings 44d-2a, and the sheet P2 first fed by the first pickup roller 71 and printed on the first surface A by the first stencil printing unit 3 is brought into the carry-in position C1. When the sheet P2 is inserted, the suction opening of the space forming member 44d-1 that forms the space 44d-1a that communicates with the suction bag 42c of the suction plate 42 that sucks the inserted paper P2, that is, the most upstream side in the transport direction F The two disks 44d-2b are opened by overlapping the respective openings 44d-2a. An optical sensor (not shown) that detects whether or not there is a sheet P2 in the conveyance path of the first conveyance unit 7 and upstream of the carry-in port of the storage unit 4 is provided. When detected, the two most upstream disks 44d-2b are opened.

  Then, the suction control unit moves the suction plate 42 by five sheets, that is, five pitches in the transport direction F by the transport belt 43b of the moving unit 43, that is, the suction plate on which the first sheet P2 is sucked. When 42 is positioned on the next space 44d-1a next to the downstream side in the transport direction F, the disks 44d-2b of the next space 44d-1a are opened, and all the disks 44d-2b are sequentially turned in the same manner. Open. When the suction plate 42 is positioned on the next next space 44d-1a, suction is already possible.

  Then, the adsorption control unit feeds a predetermined number of sheets P1 from the sheet feeding table 2, sequentially prints one side A of the sheet P1 by the first stencil printing unit 3, and finally prints it by the first stencil printing unit 3. The sheet P2 is carried into the storage unit 4 along the suction plate 42 at the carry-in position C1 by the carry-in device 74, and after being transported in the transport direction F by 5 pitches while being sucked by the suction plate 42, that is, After the last sheet P2 passes above the space 44d-1a located on the most upstream side in the transport direction F, the disk 44d-2b located on the most upstream side in the transport direction F is closed, and sequentially in the same manner. Each time the suction plate 42 moves by 5 pitches in the transport direction F, the disk 44d-2b adjacent to the downstream side in the transport direction F of the disk 44d-2b in the closed state is closed.

  As described above, the suction force is generated only on the suction surface of each predetermined number of the suction plates 42 including the suction plates 42 into which the paper P2 is carried in, so that the suction plates 42 in which the paper P2 is not carried in all the predetermined number of sheets. It is possible to prevent the adsorption force from being reduced due to air suction from the holes 42a.

  Next, a double-sided stencil printing apparatus according to still another embodiment will be described. FIG. 9 is a schematic configuration diagram of a double-sided stencil printing apparatus according to another embodiment. The double-sided printing apparatus of the present embodiment includes an error detection unit that detects a paper conveyance error in the middle of the conveyance path of the paper P1, P2, and P3 by the various conveyance devices of the double-sided stencil printing apparatus 1 of the above-described embodiment.

  The error detection unit feeds the paper P1 to the first stencil printing unit 3 by the first transport unit 7, prints the first surface A of the paper P1 by the first stencil printing unit 3, and the first transport unit 7 The sheet P2 is transported to the storage unit 4 by the transport, the sheet P2 is transported from the loading position C1 to the unloading position C2 in the storage unit 4 by the suction moving unit 41, and the second stencil of the sheet P2 by the second transport unit 8 Conveyance to the printing unit 5, printing on the other surface B of the paper P <b> 2 by the second stencil printing unit 5, and transportation of the paper P <b> 3 to the paper discharge tray 6 by the discharge device 84 are predetermined for each paper P. In the present apparatus 1, which is continuously performed at predetermined time intervals, it is detected whether or not the sheets P1, P2, P3 are present at predetermined positions at the predetermined time intervals. When the sheets P1, P2, P3 are not present at the predetermined position at the timing It detects that there is a transfer error.

  The error detection unit is composed of an optical sensor that can detect the presence of the sheet P by blocking the light when the sheet P is present. As shown in FIG. On the way, the first sensor S1 is in the conveyance path between the first pickup roller 71 and the first timing roller 72, and the second sensor S2 is in the conveyance path between the first conveyance device 73 and the second conveyance device 76. Is arranged in the middle of the conveyance path by the second conveyance section 8 and between the second pickup roller 82 and the second timing roller 83, and the third sensor S3 and the second stencil printing section 5 are disposed. The fourth sensor S4 is disposed in the transport path between the paper and the discharge device 84, and each of the first to fourth sensors S1 to S4 detects whether or not the paper P is present at each detection timing. To do.

  A printing control unit (not shown) for controlling the printing operation by the apparatus 1 is configured such that the apparatus 1 feeds the paper P1 to the first stencil printing unit 3 by the first transport unit 7 and the first stencil printing unit 3. Printing on one side A of the paper P1 by the sheet, transporting the sheet P2 on which the first side A has been printed to the storage unit 4, and carrying-out position from the carry-in position C1 in the storage unit 4 by the suction moving unit 41 Transport of the paper P2 to C2, transport of the paper P2 to the second stencil printing unit 5 by the second transport unit 8, printing on the other surface B of the paper P2 by the second stencil printing unit 5, and discharge A series of printing in which the sheet P3 on which the one side A and the other side B (both sides) have been printed by the device 84 is sequentially and continuously carried out with respect to each sheet P at a predetermined time interval. If the third sensor S3 does not detect the paper P2 at the detection timing while the operation is continued In addition, it is determined that a conveyance error of the paper P has occurred in the storage unit 4, and the series of printing operations are stopped, and the suction control unit (not shown) that controls the suction fan unit 44 is stopped to drive the suction fan 44 b. Thus, the generation of the suction force in the suction plate 42 is stopped.

  On the other hand, the printing control unit does not detect the sheet P at each detection timing by at least one of the first sensor S1, the second sensor S2, and the fourth sensor S4 while the apparatus 1 continues the series of printing operations. Sometimes, it is determined that a conveyance error of the paper P has occurred outside the storage unit 4, and the generation of the suction force on the suction plate 42 is continued by stopping the series of printing operations and continuing to drive the suction fan 44b. Let

  As described above, when a conveyance error occurs outside the storage unit 4, that is, when no conveyance error occurs in the storage unit 4, the sheet P 2 can be adsorbed to the suction plate 42. The position shift of P2 can be prevented, and when the conveyance error outside the storage unit 4 is resolved, the series of printing operations can be resumed using the paper P2 inside the storage unit 4. it can. Thus, when a conveyance error occurs, the sheet P2 inside the storage unit 4 can be used effectively without being discarded, and is necessary for the series of operations up to the storage unit 4 for each sheet P2 inside the storage unit 4. Therefore, it is possible to reduce the time required for printing a predetermined number of sheets, and to prevent a decrease in printing productivity.

  Next, still another embodiment of a double-sided stencil printing apparatus will be described. The double-sided printing apparatus of this embodiment further includes a peeling member (peeling means) 75 for peeling the paper P2 sucked by the conveyance belt 74b by the fan 74c in the carry-in device 74 of the double-sided stencil printing apparatus 1 of the above-described embodiment. Is. FIG. 10 is a diagram for explaining the process from carrying in the paper P2 to the storage unit 4 of the double-sided stencil printing apparatus according to this embodiment. The suction part 42 in FIG. 10 has the same structure as the suction part 42 in the above embodiment, although the drawing is different for convenience. Further, for the sake of convenience, the suction portion 42 in FIG. 10 is a view for sucking the leading end portion of the paper P2 carried in by the carry-in device 74, but actually, as shown in FIGS. 4 and 6, the side edge portion of the paper P2 is used. Adsorbs.

  As shown in FIG. 10, the peeling member 75 is disposed in the vicinity of the conveying belt 74b on the side that sucks and conveys the paper P2, and has a rotating shaft 75a rotated by a motor (not shown) and one end connected to the rotating shaft 75a. The peeling claw 75b rotates with the rotation of the rotary shaft 75a. The peeling operation by the peeling member 75 is controlled by a peeling control unit (peeling control means) (not shown), and this peeling operation will be described below.

  As shown in FIG. 10 (a), the sheet P2 is inserted between the two suction plates 42 located across the carry-in position C1, and both side edges of the sheet P2 are positioned on the upstream side in the transport direction F. When being sucked and conveyed by the carry-in device 74 while being attracted to the suction plate 42 and conveyed to a predetermined position, the conveyance belt 74b of the carry-in device 74 is stopped.

  As shown in FIG. 10 (b), when the suction plate 42 starts moving from the carry-in position C1 toward the carry-out position C2 due to the movement of the transport belt 43b shown in FIG. The sheet P2 is peeled off from the conveying belt 74b by 75b.

  As soon as the sheet P2 is peeled from the transport belt 74b, as shown in FIG. 10C, the rotating shaft 75a is rotated backward to move the stripping claw 75b to a position where it does not interfere with the sheet loading. The sheet P2 is carried in and inserted between the two suction plates 42 located across the carry-in position C1, and the operations shown in FIGS. 10 (a) to 10 (c) are repeated.

  By performing the peeling operation as described above, the paper P2 can be reliably peeled from the transport belt 74b. Therefore, when the paper P2 to be transported next time is transported by the carry-in device 74, the next paper P2 and It is possible to prevent the positional deviation of the paper P2 caused by the rebound caused by the collision with the previous paper P2. Further, it is possible to prevent the one side A of the next paper P2 from being rubbed by the previous paper P2. Thereby, it is possible to reliably and stably carry the paper P2 by the carry-in device 74.

  Further, since the peeling operation is performed in a state where both side edges of the paper P2 are sucked by the suction plate 42, even if the paper P2 is peeled off from the conveying belt 74b, the positional deviation of the paper P2 can be suppressed.

  The double-sided stencil printing apparatus 1 of the above-described embodiment has the above-described configuration, but the double-sided printing apparatus of the present invention is not limited to this. For example, on the upper side of the apparatus housing 10, a scanner unit that reads an image of a document, There may be provided a plate making unit for making a plate by punching a stencil sheet based on the stencil image data generated based on the image data of the original image read by the scanner unit.

  The double-sided printing apparatus of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

Schematic configuration of double-sided stencil printing machine Detailed enlarged view of the main part of the double-sided stencil printing apparatus of FIG. AA line sectional view of FIG. Detailed view of main parts seen from the direction of arrow B in FIG. Schematic diagram of the main part seen from the arrow U1 in FIG. Detail enlarged view of main part viewed from arrow U2 in FIG. Detail sectional drawing of the principal part of the adsorption | suction moving part of 2nd Embodiment Detail sectional drawing of the principal part of the adsorption | suction moving part of 3rd Embodiment Schematic configuration diagram of a double-sided stencil printing apparatus of another embodiment The figure explaining the process from carrying in of the paper to the storage part of the double-sided stencil printing apparatus of other embodiment to carrying out.

Explanation of symbols

1 Double-sided stencil printing device (double-sided printing device)
DESCRIPTION OF SYMBOLS 10 Apparatus housing 2 Paper feed stand 3 1st stencil printing part (1st printing means)
4 storage part 41 adsorption movement part (holding mechanism)
42 Adsorption plate (adsorption member, left adsorber, right adsorber)
42a hole 42b front plate 42c suction bag 42b back plate 43 moving part (moving means)
43a Pulley (moving body drive means)
43b Conveyor belt (annular moving body)
44 Suction fan section 44a Suction case 44b Suction fan 44c, 44d Shutter section 5 Second stencil printing section (second printing means)
6 Discharge stand 7 1st conveyance part (1st conveyance means)
75 Peeling member (peeling means)
8 Second transport section (second transport means)
73c, 74c, 76c, 81c, 84c Fan (suction part)
C1 carry-in position C2 carry-out position R moving path part P paper

Claims (13)

First printing means for printing on one side of the paper;
A storage section for storing a plurality of sheets on which the one side is printed;
Second printing means for printing on the other side of the paper;
First conveying means for conveying a sheet of which one side is printed by the first printing means to the storage unit;
A second transport unit that sequentially transports a plurality of sheets stored in the storage unit to the second printing unit;
The storage unit includes a holding mechanism that holds a plurality of sheets on which the one side is printed in a state in which the other side of each sheet is adsorbed and stacked with a predetermined interval therebetween. Double-sided printing device. The storage section has a predetermined interval between a carry-in position where the paper conveyed by the first conveyance means is carried in and a carry-out position where the stored paper is delivered to the second conveyance means. Have
The holding mechanism is configured to sequentially attract each sheet carried into the carry-in position and move the paper from the carry-in position to the carry-out position in a state of being stacked with a predetermined interval therebetween. Item 2. The double-sided printing apparatus according to item 1.   The holding mechanism includes a plurality of suction members that each suction the other surface of the sheet, and a moving unit that sequentially moves the suction members from the carry-in position to the carry-out position at a predetermined interval from each other. The double-sided printing apparatus according to claim 2.   The double-sided printing according to claim 3, wherein the suction member includes a left suction body that sucks the other surface of the left edge of the paper and a right suction body that sucks the other surface of the right edge. apparatus.   The moving means repeatedly moves the suction member from the carry-in position toward the carry-out position by moving the suction member along an annular movement path including a movement path portion from the carry-in position to the carry-out position. The double-sided printing apparatus according to claim 3, wherein the double-sided printing apparatus is provided. The moving means is
An annular moving body provided with the adsorbing members spaced apart from each other and circulated along the annular movement path;
6. The double-sided printing apparatus according to claim 5, further comprising moving body driving means for circulatingly moving the annular moving body along the annular moving path.   7. The apparatus according to claim 3, wherein the suction member is configured to generate a suction force only when the suction member is located on a moving path portion from the carry-in position to the carry-out position. Double-sided printing device.   The double-sided printing apparatus according to claim 7, further comprising suction control means for controlling generation of the suction force of the suction member.   The double-sided printing apparatus according to claim 8, wherein the suction control unit generates the suction force only on a suction member having a sheet to be sucked. When the suction control unit causes an error in transporting the paper outside the storage unit, the suction force is continuously generated in the suction member;
The double-sided printing apparatus according to claim 8 or 9, wherein when the sheet conveyance error occurs in the storage unit, generation of the adsorption force in the adsorption member is stopped.   The double-sided printing apparatus according to any one of claims 1 to 10, wherein the holding mechanism is configured to hold the plurality of sheets in an erected state with a predetermined interval therebetween. The first transport unit includes a first suction unit that transports the paper into the storage unit while sucking the paper, and / or the second transport unit transports the paper from the storage unit while sucking the paper. Having a second suction part;
12. The double-sided sheet according to claim 1, further comprising a separating unit that separates the sheet sucked by the first suction unit and / or the second suction unit from the suction unit. Printing device.   And a feed control means for causing the moving body driving means to intermittently feed the annular moving body by one pitch at a time, and for causing the peeling means to perform a peeling operation in synchronization with the intermittent feeding of the annular moving body. The double-sided printing apparatus according to claim 12.

Images