JP2013082531A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer configured to prevent paper jam or paper misalignment on a paper tray by effectively preventing rebound on a stop guide plate, irrespective of the paper to be discharged initially or the other paper, in consecutively printing a predetermined number of sheets of paper.SOLUTION: The printer includes: a stop guide plate 51 formed in a paper tray 3, to be brought into contact with the leading edge of the discharged paper in a discharge direction and moving in the discharge direction; and a paper sensor 71 formed in a paper discharge part 10 to detect passage of a predetermined portion of the discharged paper. A controller controls the stop guide plate to move back and forth by a predetermined distance in the paper discharge direction for each discharged paper, when the paper is detected by the paper sensor, and controls operation so that the leading edge of the discharged paper can abut on the stop guide plate during the forward moving process. Furthermore, the controller controls the operation of the stop guide plate so that the back-and-forth movement of the stop guide plate for the initial discharged paper including the first discharged paper can be started earlier than the start of the back-and-forth movement of the stop guide plate for the remaining discharged paper.

Description

  The present invention relates to a printing machine, and more particularly, to a printing machine in which a stop guide plate that is movable in a paper discharge direction is provided in a paper receiving portion on which printed paper is stacked.

  In general, a printing machine, for example, a stencil printing machine, includes a sheet feeding unit that supplies sheets one by one, a printing unit that prints sheets supplied from the sheet feeding unit, and a sheet discharge unit that discharges printed sheets. A paper receiving unit for stacking sheets discharged from the paper discharge unit, and a control unit for controlling driving of each unit.

  In such a stencil printing machine, as described above, a stop guide that can be moved back and forth in the paper discharge direction in order to stack printed sheets that are continuously discharged from the paper discharge section to the paper receiving section. The structure which arrange | positions a board is known (patent document 1).

  That is, each time a sheet is discharged from the sheet discharge unit, the stop guide plate is reciprocated by a fixed stroke in the sheet discharge direction, and the leading end of the falling sheet in the discharge direction comes into contact with the stop guide plate during the forward path. Thus, the start timing of the reciprocating motion of the stop guide plate is controlled. As a result, paper rebound is suppressed and the edges in the paper discharge direction are neatly aligned.

JP-A-11-138966

  In a conventional stencil printing machine, the start timing of the reciprocating motion of the stop guide plate is always controlled to be the same for a predetermined number of sheets that are continuously discharged regardless of the number of discharged sheets and the discharge order. It was.

  However, in a printing operation in which a predetermined number of sheets are continuously printed, the first sheet (or the second sheet or the third sheet from the first) is discharged until it comes into contact with the stop guide plate. The time tends to be shorter than the time until the remaining paper comes into contact with the stop guide plate. In particular, the tendency is remarkable in the paper receiving portion provided with the stop guide plate and the width guide plate that aligns both ends in the width direction of the paper.

  For example, FIG. 20 shows a state when the first sheet P1 is discharged from the paper discharge unit 110 to the paper receiving unit 111. From the space surrounded by the stop guide plate 151 and the width guide plate 152, FIG. The flow of the air that escapes to the outside is not sufficiently formed, and an air pool is maintained below the paper. For this reason, as shown in FIG. 21, compared to when the second sheet P2 is discharged, the drop distance until it comes into contact with the stop guide plate 151 is shortened. In other words, the height H1 of the portion where the first sheet P1 shown in FIG. 20 contacts the stop guide plate 151 is the height H1 of the portion where the second sheet P2 shown in FIG. It becomes higher than H2. For this reason, the timing at which the leading end P1a of the first sheet P1 contacts the stop guide plate 151 is often the timing at which the stop guide plate 151 stops at the closed position or immediately after the start of movement forward. The amount of rebounding has to be large.

  If the amount of paper bounce is large, a part of the bounced paper rides on the upper surface 179a of the trailing edge regulating plate 179. As a result, the leading edge of the next discharged paper collides with the rear part of the paper, and the paper jam occurs. Or the alignment of the stacked sheets on the paper tray 150 may be disturbed.

  In the present invention, when a predetermined number of sheets are continuously printed, the bounce by the stop guide plate is effectively suppressed for any of the sheets, regardless of whether the sheet is initially ejected or the other sheets. It is an object of the present invention to provide a printing machine that can prevent paper jamming and prevent paper misalignment on a paper cradle.

  In order to solve the above problems, the present invention provides a paper feeding unit that supplies paper one by one, a printing unit that prints the paper supplied from the paper feeding unit, and a paper discharge unit that discharges the printed paper. A paper receiving unit for stacking the paper discharged from the paper discharge unit, and a control unit for controlling the driving of each unit, the paper receiving unit being discharged from the paper receiving table on which the paper is stacked In a printing press provided with a stop guide plate that abuts the leading end of the paper to be discharged and is movable in the discharge direction, and the paper discharge unit includes a paper sensor that detects passage of a predetermined portion of the discharged paper The control unit reciprocates the stop guide plate by a predetermined distance in the paper discharge direction for each discharged paper based on detection of the paper passage by the paper sensor, and the leading edge of the discharged paper moves during the forward path. Front so that it contacts the stop guide plate The start timing of the reciprocating motion of the stop guide plate with respect to the first discharged paper or the initial discharged paper group including the first paper out of a predetermined number of sheets continuously discharged, which controls the operation of the stop guide plate However, the operation of the stop guide plate is controlled so as to be earlier than the start timing of the reciprocation of the stop guide plate with respect to the remaining discharged sheets.

  In the above invention, preferably, the start timing of the reciprocation of only the first discharge sheet can be controlled to be earlier than the start timing of the reciprocation of the second and subsequent discharge sheets. Further, the start time of the reciprocating motion can be set so that the discharged paper contacts the stop guide plate in the middle or the latter half of the forward path of the stop guide plate. Further, the initial number of discharged sheets can be arbitrarily set.

(1) According to the present invention, the reciprocation start time of the stop guide plate with respect to the first sheet to be discharged or the paper group is set earlier than the reciprocation start time with respect to the remaining sheets. When printing, from the beginning to the end of the first discharged paper, it can land on the paper cradle in a stable state without causing a large bounce and can be stacked in a neatly aligned state.

(2) By setting the start time of the reciprocating motion so that the discharged paper abuts the stop guide plate in the middle or the latter half of the forward path of the stop guide plate, the rebound phenomenon of the discharged paper is more effectively prevented. be able to.

(3) By setting the initial number of sheets to advance the reciprocation start time arbitrarily according to the type or characteristics of the sheet, it is possible to reliably prevent the paper receiving part from bouncing back and clean. Can be loaded.

1 is a schematic side view of a stencil printing machine according to the present invention. It is a perspective view of the paper receiving part of the stencil printing machine of FIG. It is a perspective view which shows the stop guide plate of the paper receiving part of FIG. 2, and its drive system. FIG. 3 is a perspective view showing a width guide plate of the paper receiving portion of FIG. 2 and its drive system. It is a perspective view of the paper support member of the paper receiving part of FIG. FIG. 3 is a perspective view of a rear end regulating plate of the paper receiving portion of FIG. 2. It is a block diagram which shows the control system of the stencil printing machine of FIG. It is a figure which shows the time chart regarding the action | operation of the paper discharge part of the stencil printing machine of FIG. 1, and a paper receiving part. FIG. 6 is a schematic plan view of a paper receiving portion in which a stop guide plate and a width guide plate are both in a closed position. 6 is a schematic plan view of a paper receiving portion in a state where both a stop guide plate and a width guide plate are in an open position. It is an operation explanatory view of the paper receiving portion showing a state immediately before the first sheet is discharged. It is an operation explanatory view showing a state at the time of detecting the trailing edge of the first sheet. It is action | operation explanatory drawing at the time of the reciprocating motion of a stop guide board with respect to the 1st sheet | seat. It is an operation explanatory view showing a state where the first sheet is in contact with the stop guide plate. FIG. 10 is an operation explanatory view showing a state where the first sheet is falling after contacting the stop guide plate. FIG. 10 is an operation explanatory diagram illustrating a state when the trailing edge of the second sheet is detected while the first sheet is falling. FIG. 10 is an operation explanatory diagram illustrating a state in which the first sheet has landed and the reciprocating movement of the stop guide plate starts with respect to the second sheet. It is an operation explanatory view showing a state in which the second sheet is in contact with the stop guide plate. It is action explanatory drawing which shows the state which is falling after the 2nd paper contact | abuts to a stop guide plate. It is action | operation explanatory drawing which shows the state which the 1st sheet | seat in the prior art example contacted the stop guide plate. It is action | operation explanatory drawing which shows the state which the 2nd sheet | seat in the prior art example contacted the stop guide plate.

  1 to 8 show an embodiment of the present invention, and the embodiment of the present invention will be described based on these drawings.

[Overall configuration of stencil printing machine]
FIG. 1 is a schematic side view of a stencil printing machine according to the present invention, and is provided with a paper feeding unit 2 and a paper receiving unit 3 at both ends of the printing machine main body 1 in the paper conveyance direction. The side on which the paper part 2 is arranged (left side of the drawing) is called “rear” of the stencil printing machine, and the side on which the paper receiving part 3 is arranged (right side of the drawing) is called “front” of the stencil printing machine, This will be described below.

  An image reading device 4 is provided on the upper side of the printer main body 1, and the image reading device 4 can read a document for plate making. An operation panel 5 is provided on the operation side of the upper end portion of the printing press main body 1, and the operation panel 5 is used to perform input such as printing start, printing stop, setting of various printing conditions, and the like by key operation. it can. A control unit 14 for controlling each part of the stencil printing machine is provided adjacent to the operation panel 5 or integrally with the operation panel 5.

  In the printing machine main body 1, a printing unit 6 is provided at an approximately middle part in the front-rear direction, a plate making unit 7 is provided at the upper rear of the printing unit 6, and a plate discharging unit 8 is provided at the upper front of the printing unit 6. A paper discharge unit 10 is provided between the printing unit 6 and the paper receiving unit 3, and a reverse refeed unit 11 is provided below the printing unit 6 and the paper discharge unit 10. A timing roller 13 is provided between the paper feeding unit 2 and the printing unit 6.

  The printing unit 6 is inscribed in an ink supply roller (not shown) and rotationally driven in the direction of the arrow R, and can be moved in the up-down direction so as to be opposed to the printing plate cylinder 20 from below. The printing paper P is sandwiched between the printing plate cylinder 20 and the pressing roller 21 and conveyed to print on the upper surface of the printing paper P.

  The paper supply unit 2 includes a paper supply base 23 on which the print paper P is stacked, a paper supply roller 24, a webbing base 25, and the like, and supplies the print paper P stacked on the paper supply base 23. The roller 24 and the rolling member 25 supply the timing roller 13 one by one from the top. The timing roller 13 operates at a timing synchronized with the rotation of the printing plate cylinder 20 so that printing can be performed at a predetermined position on the paper P, and feeds the printing paper P into the printing unit 6.

  The paper discharge unit 10 includes an air suction type belt conveyance mechanism, and adsorbs the print paper P onto the paper discharge belt 26 and discharges the print paper P to the front paper receiving unit 3.

  The plate making unit 7 includes a stencil sheet roll 30, a thermal head 31, and a platen roller 32 in contact with the thermal head 31, and based on image data read by the image reading device 4, the stencil sheet roll 30 is made with the thermal head 31, and the stencil sheet N after the plate making is mounted on the outer peripheral surface of the printing plate cylinder 20 of the printing unit 6.

  The plate discharging unit 8 includes a pair of upper and lower drawing rollers 36 and a base paper storage roll 37 in a housing 35. The drawing roller 36 is positioned at a position corresponding to the front upper end of the printing plate cylinder 20 and sandwiches the leading end of the stencil sheet N after printing mounted on the outer peripheral surface of the printing plate cylinder 20. The stencil sheet N after printing is wound around the base sheet storage roll 37.

  The reverse refeed unit 11 is a refeeding tray 40 that can be moved up and down on which the surface-printed paper P is stacked, and a refeed that picks up and transports the paper P on the refeeding tray 40 one by one from the top. A roller 42 and a separating member 43, and a plurality of pairs of intermediate transport rollers 44 that feed the paper P transported from the refeed roller 42 into the timing roller 13 in a reverse state. That is, the paper P on the refeed tray 40 is fed one by one from the top to the timing roller 13 by the refeed roller 42, the separating member 43, and the intermediate transport roller 44.

  The paper receiver 3 includes a paper tray 50 on which printed paper P is stacked, a stop guide plate 51 that receives a leading end (front end) of the paper P discharged from the paper discharge unit 10, and both left and right sides of the paper P A pair of left and right width guide plates (the front side width guide plate is omitted) 52 that regulates the edge, a paper support member 54 that maintains the paper P stacked on the paper tray 50 in a U-shape, and a paper tray A rear end regulating plate 79 that can be moved up and down is disposed at the rear end of 50.

[Details of paper receiver 3]
2 to 6 show details of the paper receiving portion 3, FIG. 2 is a perspective view of the entire paper receiving portion 3 as seen from the rear upper side, and FIG. 3 is a perspective view showing the stop guide plate 51 and its drive system. 4 is a perspective view showing the width guide plate 52 and its driving system, FIG. 5 is a perspective view showing a U-shaped sheet support member 54 and its driving system, and FIG. 6 is a rear end regulating plate 79 and its driving system. FIG.

  In FIG. 2, the pair of left and right width guide plates 52 are erected in a substantially vertical posture with respect to the upper surface of the paper receiving tray 50, and the discharge guides of the width guide plates 52 are discharged on the inner surfaces in the discharge width direction (left and right direction). A streak-like protrusion 52a protruding inward in the width direction is formed. Each of the streak-like protrusions 52a extends in a vertical direction from a substantially upper end to a lower end of the width guide plate 52 and is formed in a plurality at a predetermined interval in the front-rear direction.

  The U-shaped paper support members 54 are arranged in two rows at intervals in the paper discharge width direction, and protrude from the top surface of the paper tray 50 to support the paper in a U-shape (shown in the figure). Position) and a retracted position retracted downward from the upper surface of the paper tray 50. The upper edge of the paper support member 54 at the support position is inclined so that the central side in the paper discharge width direction is lowered, thereby supporting the paper on the paper receiving tray 50 in a U-shape. Yes.

  The stop guide plate 51 is disposed at the center of the paper receiving tray 50 in the paper discharge width direction, and can be swung back and forth so that the position can be adjusted in the paper discharge direction (front-rear direction) and the jogger operation can be performed. ing.

  In FIG. 3, the drive system of the stop guide plate 51 includes a pair of left and right guide shafts 60 extending in the paper discharge direction (front-rear direction), a drive belt 61 laid along the paper discharge direction, and a pair of front and rear pulleys or gears. 62, a motor 63, and the like. The lower end portion of the stop guide plate 51 is supported by the guide shaft 60 so as to be movable in the front-rear direction and is connected to the drive belt 61. Therefore, the stop guide plate 51 can be moved in the front-rear direction via the pulley 62 and the drive belt 61 by the rotation of the motor 63.

  In FIG. 4, the drive system of the width guide plate 52 includes a pair of left and right motors 65 and left and right drive belts 67 linked to each motor 65 through a speed reduction mechanism 66. By rotation, the left and right width guide plates 52 are moved symmetrically with respect to the center line of the left and right widths via the speed reduction mechanism 66 and the drive belt 67.

  FIG. 5 shows a drive system of the paper support member 54 for forming a U-shape, and each paper support member 54 is fixed to a rotation shaft 69 extending in the front-rear direction at the end on the center side of the left-right width. By rotating the rotation shaft 69, the position is changed between the support position and the retracted position.

  FIG. 6 shows the rear end regulating plate 79 and its drive system. The rear end regulating plate 79 is formed in a cross-sectional hat shape in which the central portion in the discharge width direction projects forward, and the central portion in the discharge width direction. A guide upper surface 79 a formed at the upper end of the paper discharge unit 10 is formed at substantially the same height as the paper discharge surface (conveyance surface) of the paper discharge unit 10.

  The rear end regulating plate 79 is supported by a pair of left and right guide rails (one side omitted) 82 so as to be movable in the vertical direction, and is connected to a drive motor 85 via a rack 83 and a pinion 84. It is supposed to go up and down.

[Control system]
In FIG. 1, an optical paper sensor 71 that detects the presence or absence of the paper P discharged from the paper discharge unit 10 is disposed at the front end of the paper discharge unit 10. The paper sensor 71 can detect the front edge (leading edge in the discharging direction) and the trailing edge (terminal edge in the discharging direction) of the paper P passing through the front edge of the paper discharge unit 10. In addition to the paper sensor 71 of the paper discharge unit 10, although not shown, similar paper sensors are disposed in appropriate positions in the paper feed unit 2 and the printer main body 1.

  7 is a block diagram of the control system, FIG. 8 is a time chart regarding the operation of the stop guide plate 51 and the width guide plate 52, and FIGS. 9 and 10 are states of the closed position of the stop guide plate 51 and the width guide plate 52. It is a top view which shows the state of an open position, respectively. In FIG. 7, the paper sensor 71 and the operation panel 5 of the paper discharge unit 10 are electrically connected to the input unit of the control unit 14. An external computer 72 and an external memory 73 can be connected to the input unit of the control unit 14. The drive systems of the plate making unit 7, the plate discharging unit 8, the paper feeding unit 2, the printing unit 6, the paper discharge unit 10, and the paper receiving unit 3 are electrically connected to the output unit of the control unit 14. In particular, in the paper receiver 3, the drive systems of the width guide plate 52, the stop guide plate 51, and the paper support member 54 are electrically connected to each other.

  On the operation panel 5, various printing information is displayed, printing plate start operation keys, printing start and printing stop operation keys, duplex printing and single-sided printing selection keys, and various printing conditions such as paper dimensions and paper quality are set. A key or the like is displayed or provided.

  FIG. 9 shows a state in which both the stop guide plate 51 and the width guide plate 52 are in the closed position, and the both width guide plates 52 are positioned so that the distance between them corresponds to the left-right width D2 of the paper P. 51 is positioned such that the distance between the stop guide plate 51 and the rear end regulating plate 79 corresponds to the length D1 of the paper P in the discharge direction. The closed positions of the stop guide plate 51 and the width guide plate 52 are set automatically or by operation of the operation panel 5 according to the paper size. For example, when the paper size increases, the closed position of the stop guide plate 51 is displaced forward.

  FIG. 10 shows a state in which both the stop guide plate 51 and the width guide plate 52 are in the open position, and the both width guide plates 52 are separated from the edge Pc in the discharge width direction of the paper P by an interval (stroke) S2, respectively. The stop guide plate 51 is separated from the front edge (the leading edge in the discharge direction) Pa of the paper P by a distance (stroke) S1.

(Control of stop guide plate 51)
As a basic control of the operation of the stop guide plate 51 written in the storage unit of the control unit 14, during the printing operation, the stop guide plate 51 in the closed position shown in FIG. 9 is a sheet by the paper sensor 71 of the paper discharge unit 10 in FIG. Based on the detection of the trailing edge Pb, after a predetermined time has elapsed since the detection, reciprocation to the open position shown in FIG. 10 is started. In addition to this control, among a predetermined number of sheets to be continuously printed, The start time is controlled so that the start time of the reciprocation of the first sheet P is earlier than the start time of the reciprocation of the second and subsequent sheets P. This control will be described in detail with reference to the time chart of FIG.

  In FIG. 8, the bottom row shows detection of the presence or absence of a sheet by the sheet sensor 71, and P1, P2, P3, P4, P5... Are obtained by adding numbers to the sheet code P in the order of ejection. A1b is the time when the trailing edge of the first sheet P1 is detected (the state shown in FIG. 12), and A2b, A3b, and A4b are after the second, third, and fourth sheets P2, P3, and P4, respectively. At the time of edge detection.

  The second stage from the bottom of FIG. 8 shows the forward, reverse, and off switching states of the drive motor 63 of the stop guide plate 51, and the third stage from the bottom shows the open / closed state of the stop guide plate 51 itself. .

  The control for the second and subsequent sheets P2, P3, P4,... Is performed after a predetermined time t1 (for example, 0.06 seconds) has elapsed from the time A2b, A3b, A4b,. The stop guide plate drive motor 63 is switched from the OFF state to the forward rotation state, whereby the stop guide plate 51 starts moving in the forward path from the closed position to the open position. When the stop guide plate 51 reaches the open position by moving the forward path, the stop guide plate drive motor 63 is temporarily stopped and then switched to the reverse rotation state. Thereby, the stop guide plate 51 moves in the return path from the open position to the closed position.

  The predetermined time t1 until the start time of the reciprocating motion is set so that the front end of the discharged sheet comes into contact with the stop guide plate 51 during the forward stroke of the stop guide plate 51, particularly in the middle or the latter half of the forward stroke. ing. The symbol C shown in the third graph from the bottom is the time when the front ends of the second and subsequent sheets P2, P3, P4,... Abut against the stop guide plate 51, and the stroke S3 is the stop guide at the point C. This is a stroke from the closed position of the plate 51. That is, each start time (predetermined time t1) is set so that the stroke S3 of the stop guide plate 51 at the time of contact is half or more than the entire stroke S1 of the stop guide plate 51.

  Unlike the control for the second and subsequent sheets P2, P3, P4, etc., the control for the first sheet P1 starts from the point A1b when the trailing edge of the first sheet P1 is detected by the sheet sensor 71. The predetermined time t1a until the stop guide plate drive motor 63 switches from the OFF state to the normal rotation state is set to be shorter than the predetermined time t1 for the second and subsequent sheets of paper P2. That is, with the detection of the trailing edge of each sheet as a reference, the start timing of the reciprocating motion of the stop guide plate 51 with respect to the first sheet P1 is greater than the start timing of the reciprocating motion of the guide plate 51 with respect to the second and subsequent sheets of paper P2. It is set to be faster.

  During the predetermined time t1a for the first sheet P1, the front end P1a of the first sheet P1 discharged from the paper discharge unit 10 is in the middle or the latter half of the forward path of the stop guide plate 51. It is set so that it may contact.

  The predetermined time t1a for the first sheet P1 is shorter than the predetermined time t1 for the second and subsequent sheets P2, etc. by a time tf (for example, about 0.02 seconds). Therefore, the predetermined time t1a from when the trailing edge P1b of the first sheet P1 is detected to when the stop guide plate 51 starts to reciprocate is set to about 0.04 seconds.

  The predetermined time t1a until the start of reciprocation of the stop guide plate 51 with respect to the first sheet P1 is made shorter than the predetermined time t1 until the start of reciprocation of the stop guide plate 51 with respect to the second and subsequent sheets of paper P2, etc. The reason is that when the first sheet P1 is discharged, a sufficient flow of air is formed to escape from the space surrounded by the left and right width guide plates 52, the stop guide plate 51, and the rear end regulating plate 79. This is because the sheet P1 is not easily dropped because it is stored in the space, and the time from when the sheet P1 is discharged until it comes into contact with the stop guide plate 51 is shortened. That is, when the time until contact with the stop guide plate 51 is shortened, the sheet comes into contact with the stop guide plate 51 in the closed position before starting the reciprocation, or the stop guide plate 51 immediately after the start of reciprocation. This is because the bounce increases.

(Control of width guide 52)
The control of the operation of the width guide plate 52 is set so that the opening / closing timing is reversed compared to the control of the operation of the stop guide 51. That is, the width guide plate 52 is closed when the stop guide plate 51 is opened, and the width guide plate 52 is opened when the stop guide plate 51 is closed.

  In addition, the time from when the paper sensor 71 detects the trailing edge of the paper to when the width guide plate 52 starts to close is set to the same value for all the paper. That is, since it is not necessary to consider the amount of paper bounce, regardless of the first sheet P1, the second and subsequent sheets P2, etc., when detecting the trailing edge of each sheet, A1b, A2b, A3b, A4b It is set to start reciprocation after a predetermined time t1 has elapsed.

(Example of printing work)
(1) In FIG. 1, the stencil printing machine is started up, a sheet P of a predetermined size is loaded on the sheet feeding table 23, and various printing conditions are set by the operation panel 5. For example, a paper size and the number of printed sheets are input, and a printing method is selected on a selection screen for duplex printing and simplex printing.

(2) When plate making is performed, the stencil sheet N for surface printing is made in the plate making unit 7 of FIG. 1 by operating the plate making key. That is, the plate making unit 7 makes the stencil sheet roll 30 with the thermal head 31 based on the data of the image (surface image) read by the image reading device 4, and the stencil sheet N after the plate making is used for printing by the printing unit 6. The plate cylinder 20 is mounted on the outer peripheral surface.

  Next, the printing process is substantially started by operating the printing start key on the operation panel 5. That is, the sheets P stacked on the sheet feeding table 23 are taken out one by one from the top and are sent to the printing unit 6 by the timing roller 13 at a predetermined timing.

  In the printing unit 6, the paper P is sandwiched between the printing plate cylinder 20 and the pressing roller 21, and the paper P is conveyed forward and is stencil paper by ink supplied from the printing plate cylinder 20. The surface image of N is transferred to the upper surface (front surface) of the paper P.

  The paper P whose surface is printed by the printing unit 6 is discharged forward by the paper discharge unit 10 and stacked on the paper receiving tray 50 of the paper receiving unit 3.

(Details of discharge work)
The operation of the stop guide plate 51 in the paper discharge and stacking operations will be described in detail with reference to FIGS.

  FIG. 11 shows a state in which the paper sensor 71 of the paper discharge unit 10 detects the front end (tip in the discharge direction) P1a of the first sheet P1, and the stop guide plate 51 is maintained in the closed position. .

  FIG. 12 shows a state in which the rear end P1b of the first sheet P1 is detected by the sheet sensor 71 of the sheet discharge unit 10, and the stop guide plate 51 is maintained in the closed position. 14 starts counting for starting the reciprocation of the stop guide plate 51. This is a state corresponding to the time A1b at the bottom of FIG.

  FIG. 13 shows a state where the predetermined time t1a for the first sheet has passed since the time point of FIG. 12, and the stop guide plate 51 starts to move forward from this state. However, the front end P1a of the first sheet P1 is still separated from the stop guide plate 51.

  FIG. 14 shows a state in which the first sheet P1 is in contact with the stop guide plate 51. At the time of contact, the stop guide plate 51 is moving forward in the middle or the latter half of the forward stroke. . This corresponds to the position of the point Ca on the stop guide plate 51 in FIG.

  FIG. 15 shows a state in which the stop guide plate 51 has been moved to the open position, and the first sheet P1 has been dropped with its front end P1a substantially in contact with the stop guide plate 51.

  FIG. 16 shows a state in which the first sheet P1 is being dropped and the sheet sensor 71 detects the trailing edge P2b of the second sheet P2. The count for the paper P2 is started. This corresponds to the time point A2b in FIG. At this time, the stop guide plate 51 is in the middle of a backward return stroke.

  FIG. 17 shows a state in which the stop guide plate 51 starts to move to the open position after a predetermined time t1 has elapsed from the time of detection of the trailing edge of the paper in FIG. At this time, the first sheet P1 is landed on the paper receiving tray 50, and the second sheet P2 is discharged from the paper discharge unit 10 into the paper receiving unit 3. FIG. 8 shows a state where time t1 has elapsed from the time A2b in the lowermost stage in FIG.

  FIG. 18 shows a state in which the second sheet P2 is in contact with the stop guide plate 51, and the stop guide plate 51 is moving forward in the center or the latter half of the forward path. This corresponds to the time point C of the stop guide plate 51 in FIG.

  FIG. 19 shows a state in which the stop guide plate 51 has moved to the open position, and the second sheet P2 has fallen with its front end P2a substantially in contact with the stop guide plate 51.

  Also for the third and subsequent sheets of paper P3, P4,..., The stop guide plate 51 reciprocates at the same time as the second sheet of paper P2, so that the position in the sheet discharge direction is neatly aligned.

  As shown in FIG. 8, the width guide plate 52 is controlled to perform an opening / closing operation opposite to the opening / closing operation of the stop guide plate 51, and at the same time for all sheets. Controlled to start reciprocation.

(Other printing work)
When performing double-sided printing, after printing one side and stacking the printed paper P on the paper receiving portion 3, the rear end regulating plate 79 is raised and the stop guide plate 51 is moved rearward to thereby receive the paper. The printed paper on the table 50 is transferred to the reverse refeed unit 11, the paper is supplied from the reverse refeed unit 11 to the printing unit 6 with the front and back reversed, the back side is printed, and again The paper is discharged to the paper receiver 3.

(Effect of embodiment)
(1) Since the reciprocation start timing of the stop guide plate 51 with respect to the first discharged paper P1 is earlier than the reciprocation start timing with respect to the second and subsequent sheets of paper P2, etc., from the top of the paper receiving section 3 to the outside. Even if the first sheet P1 is discharged to the paper receiving portion 3 in a state where the air flow is not sufficiently formed, a large rebound is generated in the stop guide plate 51 that is moving in the discharge direction. It can be made to contact without making. Accordingly, the predetermined number of sheets can be stacked neatly on the paper receiving tray 50 from the beginning to the end.

(2) The timing when the sheet abuts against the stop guide plate 51 is set to the time when the stop guide plate 51 is moving in the center or the latter half of the forward stroke, so that the discharged sheet abuts against the stop guide plate 51. The impact at the time can be absorbed efficiently and the bounce warping phenomenon can be effectively reduced.

(3) The trailing edge of the discharged sheet is detected by the sheet sensor 71, and the reciprocating motion of the stop guide plate 51 is started after a lapse of a predetermined time on the basis of the detection of the trailing edge of the sheet. Also for the paper, the predetermined time is a common value, and the control becomes simple.

(4) The discharge speed of the paper discharged from the paper discharge section 10 to the paper receiving section 3 may be changed depending on the type, size, or print content of the paper. Stable reciprocation control by reducing the amplitude (S1) of the guide plate 51, increasing the start timing of the reciprocation of the stop guide plate 51 as a whole, or increasing the moving speed of the stop guide plate 51. (Jogger control) can be performed.

"Other embodiments"
(1) In the above embodiment, only the reciprocation start timing of the stop guide plate for the first sheet is earlier than the reciprocation start timing of the stop guide plate for the second and subsequent sheets. Depending on the formation of the air flow in the section, the reciprocation start timing for the first and second sheets is set earlier than the reciprocation start timing of the stop guide plate for the third and subsequent sheets. It is also possible to set the reciprocation start timing for the first to third sheets earlier than the reciprocation start timing of the stop guide plate for the fourth and subsequent sheets. Of course, it is also possible for the operator to arbitrarily set the initial number of sheets to advance the reciprocation start timing.

(2) It is also possible to detect the front end (tip in the discharge direction) of the discharged paper by a paper sensor, and start the reciprocating movement of the stop guide plate after a predetermined time with reference to the time when the front end is detected. .

(3) The present invention can also be applied to printing machines other than stencil printing machines.

(4) In a printing machine capable of double-sided printing as shown in FIG. 1, it is possible to separately count and manage the total plate-making number and the total number of printed sheets for front-side printing and back-side printing. For example, the front counter and the back counter are separately managed and reflected in maintenance or the like.

(5) When using an automatic document feeder (ADF) with single-sided reading and feeding specifications as a scanner, the user selects the type of document, for example, single-sided printing or double-sided printing, and depending on the selected type, as follows: Perform plate making.
That is, when the type of the original is single-sided printing, the original placed on the ADF original table is continuously read (scanned), and the plate making operation is performed.
When the type of document is double-sided printing, the document placed on the document table of the ADF is read one by one according to the user's instruction each time, and the plate making operation is performed.

  When the 2IN1 mode is performed using a double-sided original in the single-sided reading ADF, the double-sided original can be edited (arrangement of the left and right sides of the original image and the front and back sides) in any order.

DESCRIPTION OF SYMBOLS 1 Printer main body 2 Paper feed part 3 Paper receiving part 6 Printing part 7 Plate making part 10 Paper discharge part 14 Control part 50 Paper receiving stand 51 Stop guide plate 52 Width guide plate 71 Paper sensor 79 Rear end regulation plate

Claims (4)

A paper feeding unit that supplies paper one by one, a printing unit that prints the paper supplied from the paper feeding unit, a paper discharge unit that discharges the printed paper, and a paper that is discharged from the paper discharge unit. A paper receiving portion to be loaded; and a control portion for controlling the driving of each of the portions, wherein the paper receiving portion abuts a paper receiving tray on which the paper is stacked and a leading end in the discharge direction of the discharged paper. A stop guide plate that is movable in the discharge direction, and the paper discharge unit includes a paper sensor that detects passage of a predetermined portion of the discharged paper.
The controller is
Based on detection of paper passage by the paper sensor, the stop guide plate is reciprocated by a certain distance in the paper discharge direction for each discharged paper, and the leading edge of the discharged paper abuts the stop guide plate during the forward path. Controlling the operation of the stop guide plate, and
Of the predetermined number of sheets that are continuously discharged, the stop guide plate starts to reciprocate with respect to the first discharge sheet or the initial discharge sheet group including the first sheet. The printing machine is characterized in that the operation of the stop guide plate is controlled so as to be earlier than the start time of the reciprocating motion.   2. The printing machine according to claim 1, wherein the start timing of the reciprocation of only the first discharge sheet is controlled to be earlier than the start timing of the reciprocation of the second and subsequent discharge sheets.   3. The printing machine according to claim 1, wherein the start time of the reciprocation is set so that the discharged paper abuts the stop guide plate in the middle or the latter half of the forward path of the stop guide plate.   The printing press according to claim 1, wherein the initial number of discharged sheets can be arbitrarily set.

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