JP5302040B2 - Paper receiving device and printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the hitch of already-printed paper to be discharged from a printer body in a U-shaped state, on width guides. <P>SOLUTION: The paper receiving device 3 includes a paper receiving plate 41, an up-and-down moving means 48 for moving the paper receiving plate 41 up and down, a detecting means 47 for detecting the stack height of paper P stacked on the paper receiving plate 41, the pair of width guides 44, 45 arranged on the paper receiving plate 41 at guide positions for restricting the positions of both cross ends of the paper P, and a control part for controlling the operation. The pair of width guides are movable between each guide position and each retraction position apart from the guide position outward in the paper cross direction. The control part controls the paper receiving plate to be moved down for a certain time and then stopped by the up-and-down moving means when the detecting means detects a predetermined paper stack height for a first duration time, and controls the pair of width guides to be moved to the retraction positions and then reset into the guide positions, respectively, when the detecting means detects the predetermined paper stack height for a second duration time. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a paper receiving apparatus for aligning and stacking printed sheets discharged from a printing machine main body, and a printing machine having the paper receiving apparatus.

  Conventionally, as a paper receiving device for stacking printed sheets discharged from the printing machine main body, a U-shaped formation guide mechanism is arranged at the end of the printing machine main body on the paper discharge side. There is an apparatus in which a pair of width guides are arranged at an interval narrower than the width. As a paper receiving processing method, the U-shaped formation guide mechanism is used to place printed paper at both ends in the paper width direction (perpendicular to the paper discharge direction). It is formed in a U-shape that rises, is discharged above the paper cradle, is dropped while maintaining the U-shape with the pair of width guides, and is loaded on the paper cradle (patent) Reference 1 and 2).

  In addition, the paper receiving device includes an elevator-type paper receiving table that can be moved up and down. The amount of stacked paper is detected by a detection sensor, and the printed paper is stacked to a predetermined height. The paper tray is automatically lowered (see Patent Document 2).

Japanese Patent Laid-Open No. 11-43258 (FIGS. 1, 2 and 4) Japanese Unexamined Patent Publication No. 2004-83221 (FIGS. 2 and 6 etc.)

  In the method of simply dropping printed paper discharged in a U-shape while maintaining the U-shape between a pair of width guides, it is particularly hard and firm (high rigidity) depending on the type of paper. When using a sheet, the sheet may be caught between the width guides in the middle of dropping, and subsequent sheets may be stacked one after another, which may cause a stacking failure.

  Further, in the elevator type paper receiving apparatus in which the paper receiving table is raised and lowered, the detection sensor detects an erroneously loaded amount by detecting the caught paper, and the predetermined loaded amount is not reached. Therefore, there may be a problem that the elevator continues to descend. If the lowering operation of the elevator continues for a predetermined time or more, it is detected that the paper receiving device is in an abnormal state (jam state), and the printing operation is automatically stopped (paragraphs “0103” to “0106” in Patent Document 2). Thus, stopping the printing operation leads to a reduction in work efficiency.

(Object of invention)
The present invention can solve the problem that the printed paper discharged from the printing machine main body in a U-shaped state is caught between the width guides, and the detection sensor detects the caught paper, so that the elevator continues to descend. An object of the present invention is to provide a paper receiving device and a printing machine that can eliminate the catching of paper without stopping the printing operation.

  According to a first aspect of the present application, there is provided a paper tray on which printed paper discharged in a U-shape from the printing press main body is stacked, lifting means for moving the paper tray up and down, and a stack placed on the paper tray. And a pair of width guides disposed on the paper tray at guide positions that are narrower than the width of the paper and restrict both end positions in the width direction of the paper. And the control unit that controls the operation, wherein the pair of width guides is between the guide position and a retracted position that is spaced outward from the guide position in the paper width direction. When the detection unit detects a predetermined paper stacking height for a first duration, the control unit lowers the paper tray by the elevating unit for a predetermined time and then stops it. Control, and the detecting means is a predetermined sheet. When Notaka of the detected second duration, said to return a pair of width guides to each mobile after the guide position to the retracted position, the opening and closing operation, and having control and, a.

  According to the above configuration, when the printed paper discharged from the printing machine main body in a U-shaped state is caught on the width guide for a certain time or more, the paper cradle is lowered for a predetermined time, and then the descent is stopped. It is possible to prevent the paper tray from continuing to descend in a state where the paper is caught by the width guide and is not placed on the paper tray. Further, when the paper is caught by the width guide, the width guide is opened and closed, so that the catch of the paper on the width guide can be eliminated.

  According to a second aspect of the present invention, there is provided a paper tray on which printed paper discharged in a U-shape from the printing press main body is stacked, elevating means for moving the paper tray up and down, and a stack placed on the paper tray. And a pair of width guides disposed on the paper tray at guide positions that are narrower than the width of the paper and restrict both end positions in the width direction of the paper. And the control unit that controls the operation, wherein the pair of width guides is between the guide position and a retracted position that is spaced outward from the guide position in the paper width direction. When the detection unit detects a predetermined sheet stacking height for a first duration, the control unit lowers the paper tray by the elevating unit, and the detection unit The paper loading height of the second is longer than the first duration When the duration is detected, the control unit stops the lowering of the paper cradle, and the control unit moves the pair of width guides to the retracted position and then returns to the guide position. It is characterized by performing.

  According to the above configuration, when the printed paper discharged from the printing machine main body in the U-shape is caught on the width guide for a certain time or more, the paper tray is lowered and then the width guide is opened and closed. At the same time, since the lowering of the paper cradle is stopped, it is possible to prevent the paper cradle from continuing to descend in a state where the paper is caught by the width guide and is not placed on the paper cradle. Further, when the paper is caught by the width guide, the width guide is opened and closed, so that the catch of the paper on the width guide can be eliminated.

The first invention or the second invention of the present application preferably further comprises the following configuration.
(1) After the control unit performs the opening / closing operation of the pair of width guides, the detection unit detects a predetermined sheet stacking height even if a third duration longer than the second duration elapses. When continuing, the said control part performs the opening / closing operation | movement of a pair of said width guide further for every predetermined time.

(2) Even if the control unit repeats the further opening / closing operation of the pair of width guides a predetermined number of times, if the detection unit continues to detect a predetermined sheet stacking height, the control unit The printing operation is stopped.

(3) A stop guide with which an edge in the paper discharge direction abuts is disposed on the paper tray, and the control unit moves the stop guide to a jogger position opposite to the paper discharge direction. Thus, jogging in the paper discharge direction is performed.

(4) A ceiling plate is disposed immediately above the paper cradle, and the pair of width guides are erected on the lower surface of the ceiling plate.

(5) A U-shaped state holding member that holds the paper stacked on the paper receiving table in a U-shaped state is erected on the upper surface of the paper receiving table.

  According to the configuration (1), when the opening / closing operation of the width guide does not solve the catch of the sheet on the width guide, the opening / closing operation of the width guide is further performed, so that the catch of the sheet on the width guide is more reliably performed. Can be resolved.

  According to the configuration (2), since the printing operation is stopped when the catch of the paper on the width guide is not solved by the opening / closing operation of the width guide a plurality of times, a large amount of paper is caught in the state where the paper is caught on the width guide. It is possible to prevent a problem that a large amount of printed paper is stacked on the paper that is ejected and caught by the width guide.

  According to the configuration (3), since the edge in the paper discharge direction is aligned by the jogger operation of the stop guide, the paper can be aligned and stacked on the paper receiving tray.

  According to the configuration (4), since the width guide is erected on the lower surface of the ceiling plate, the length of the width guide in the vertical direction is higher than when the width guide is erected on the upper surface of the paper tray. Can be shortened.

  According to the configuration (5), the U-shaped state holding member is erected on the upper surface of the paper tray. Therefore, since the paper discharged in the U-shape is held in the U-shape even on the paper cradle, the paper is easily aligned on the paper cradle.

  According to a third aspect of the present invention, there is provided a paper tray on which printed paper ejected in a U-shape from the printing machine main body is stacked, an elevating means for moving the paper tray up and down, and a stack placed on the paper tray. And a pair of width guides disposed on the paper tray at guide positions that are narrower than the width of the paper and restrict both end positions in the width direction of the paper. A pair of width guides each having a first guide member and a second guide member, and the pair of first guide members includes: The pair of second guide members can move between the guide position and a retracted position away from the guide position outward in the paper width direction. Located on the outside in the width direction and its guide surface is When the control unit detects a predetermined sheet stacking height for a first duration time, it can move to a jogger position that is flush with the guide surface of the first guide member. When the control unit detects the predetermined sheet stacking height for the second duration time, the pair of first guide members are moved to the retracted position, respectively. Control is performed to return to the guide position after the movement, the opening / closing operation is performed, and the pair of second guide members are moved to the jogger position for each predetermined number of discharged sheets to perform jogger in the paper width direction. And control.

  According to the above configuration, when printed paper discharged in a U-shape from the printing press main body is caught on the first guide member for a certain time or more, the paper receiving table is lowered for a predetermined time and then the descent is stopped. Therefore, it is possible to prevent the paper receiving base from continuing to descend in a state where the paper is caught by the first guide member and is not placed on the paper receiving base. Further, when the sheet is caught by the first guide member, the first guide member is opened and closed, so that the catch of the sheet on the first guide member can be eliminated. Since the edge in the width direction of the paper is aligned by the jogger operation of the second guide member, the paper can be aligned and stacked on the paper receiving tray.

  According to a fourth aspect of the present invention, there is provided a paper tray on which printed paper ejected in a U-shape from the printing press main body is stacked, lifting means for moving the paper tray up and down, and stacking on the paper tray. And a pair of width guides disposed on the paper tray at guide positions that are narrower than the width of the paper and restrict both end positions in the width direction of the paper. A pair of width guides each having a first guide member and a second guide member, and the pair of first guide members includes: The pair of second guide members can move between the guide position and a retracted position away from the guide position outward in the paper width direction. Located on the outside in the width direction and its guide surface is When the detection unit detects a predetermined sheet stacking height for a first duration time, the control unit can move the jog position to the same plane as the guide surface of the first guide member. When the paper cradle is lowered, and the detection unit detects a predetermined paper stacking height for a second duration longer than the first duration, the controller stops the descent of the paper cradle, and The control unit performs an opening / closing operation of returning the pair of first guide members to the guide position after moving the pair of first guide members to the retracted position, respectively, and the control unit moves the pair of second guide members to a predetermined position. A jogger in the paper width direction is performed by moving to the jogger position for each number of discharged sheets.

  According to the above configuration, when the printed paper discharged from the printing machine main body in a U-shape is caught on the first guide member for a predetermined time or more, the paper cradle is lowered and then the first guide member is opened and closed. Since the descent of the paper cradle is stopped simultaneously with the operation, it is possible to prevent the paper cradle from continuing to descend in a state where the paper is caught by the first guide member and is not placed on the paper cradle. Further, when the sheet is caught by the first guide member, the first guide member is opened and closed, so that the catch of the sheet on the first guide member can be eliminated. Since the edge in the width direction of the paper is aligned by the jogger operation of the second guide member, the paper can be aligned and stacked on the paper receiving tray.

The third or fourth invention of the present application preferably further comprises the following configuration.
(1) After the control unit performs the opening / closing operation of the pair of first guide members, even if a third continuation time longer than the second continuation time has elapsed, the detection unit has a predetermined sheet stacking height. When the detection continues, the controller further opens and closes the pair of first guide members every predetermined time.

(2) Even if the control unit repeats the further opening / closing operation of the pair of first guide members a predetermined number of times, the control unit performs printing if the detection unit continues to detect a predetermined sheet stacking height. The printing operation of the machine is stopped.

(3) A stop guide with which an edge in the paper discharge direction abuts is disposed on the paper tray, and the control unit moves the stop guide to a jogger position opposite to the paper discharge direction. Thus, jogging in the paper discharge direction is performed.

(4) A ceiling plate is disposed immediately above the paper cradle, and the pair of width guides are erected on the lower surface of the ceiling plate.

(5) A U-shaped state holding member that holds the paper stacked on the paper receiving table in a U-shaped state is erected on the upper surface of the paper receiving table.

  According to the configuration (1), when the opening / closing operation of the first guide member does not solve the catch of the sheet on the first guide member, the first guide member is further opened / closed. The catch on the member can be more reliably eliminated.

  According to the configuration (2), since the printing operation is stopped when the first guide member is opened and closed several times and the catch of the paper on the width guide is not eliminated, the paper is caught in the width guide. A problem that a large amount of printed paper is discharged and a large amount of printed paper is stacked on the paper caught by the width guide can be prevented.

  According to the configuration (3), since the edge in the paper discharge direction is aligned by the jogger operation of the stop guide, the paper can be aligned and stacked on the paper receiving tray.

  According to the configuration (4), since the width guide is erected on the lower surface of the ceiling plate, the length of the width guide in the vertical direction is higher than when the width guide is erected on the upper surface of the paper tray. Can be shortened.

  According to the configuration (5), the U-shaped state holding member is erected on the upper surface of the paper tray. Therefore, since the paper discharged in the U-shape is held in the U-shape even on the paper cradle, the paper is easily aligned on the paper cradle.

  In short, according to the present invention, the printed paper discharged in a U-shape from the printing press main body is caught between the width guides, and the problem that the elevator continues to descend by detecting the paper caught by the detection sensor is solved. it can. Further, according to the present invention, the paper jam can be eliminated without stopping the printing operation by performing the opening / closing operation of the width guide.

1 is a schematic front view of a stencil printing machine including a paper receiving device according to a first embodiment of the present invention. FIG. 2 is an enlarged perspective view of a U-shaped formation guide mechanism provided in the stencil printing machine of FIG. 1. 2 is a schematic plan view of the stencil printing machine of FIG. 1. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. When the sensor 47 detects a predetermined sheet stacking height for the first duration (t1), the operation of the paper tray and the width guides 44 and 45 is turned ON / OFF. When the sensor 47 detects a predetermined sheet stacking height for the second duration (t2), the operation of the paper receiving base 41 and the width guides 44 and 45 is turned ON / OFF. When the sensor 47 detects a predetermined sheet stacking height for the third continuation time (t3), the operation of the paper receiving base 41 and the width guides 44 and 45 is turned ON / OFF. Even if the width guides 44 and 45 are opened and closed a predetermined number of times, the operation of the paper receiving base 41 and the width guides 44 and 45 when the sensor 47 continues to detect the paper stacking height is shown. . It is another example of operation | movement of the paper stand 41 in FIG. It is a modification of the width guide in 1st Embodiment, and is sectional drawing in a guide position. It is a modification of the width guide in 1st Embodiment, and is sectional drawing in a guide position. It is a modification of the width guide in 1st Embodiment, and is sectional drawing in a guide position. It is a perspective view of the stencil printing machine provided with the paper receiver of 2nd Embodiment which concerns on this invention. It is a perspective view of the paper receiver of the stencil printing machine of FIG. It is a perspective view which shows the width guide of FIG. 13, and its drive mechanism. It is a perspective view which shows the 1st guide member of the width guide of FIG. 15, and its drive mechanism. It is a perspective view which shows the 2nd guide member of the width guide of FIG. 15, and its drive mechanism. It is sectional drawing of the paper receiver of FIG. 13 which shows the state of a width guide being a guide position. It is sectional drawing of the paper receiver of FIG. 13 which shows the state which the 2nd guide member expanded in the jogger position. It is a modification of the width guide in 2nd Embodiment, Comprising: It is sectional drawing in a guide position. FIG. 21 is a schematic plan view of the width guide of FIG. 20. FIG. 21 is a plan view of the width guide of FIG. 20, illustrating a state where the second guide member has moved outward in the paper width direction from the first guide member during the jogger operation. It is a modification of the width guide in 2nd Embodiment, Comprising: It is sectional drawing in a guide position. It is a modification of the width guide in 2nd Embodiment, Comprising: It is sectional drawing in a guide position. It is a modification of the width guide in 2nd Embodiment, Comprising: It is sectional drawing in a guide position.

[First Embodiment]
1 to 4 show an example of a paper receiving apparatus for carrying out the paper receiving processing method according to the present invention and a stencil printing machine provided with the paper receiving apparatus. One embodiment of the present invention is based on these drawings. A form is demonstrated.

(Overview of printing press)
In FIG. 1, which is a schematic side view of a stencil printing machine, for convenience of explanation, the paper supply side (left side of the drawing) is referred to as “rear”, and the paper transport side, that is, the paper discharge side (right side of the drawing) is referred to as “front”. In the following description, the left-right direction viewed from the front is defined as the left-right direction of the printing press and the paper P. The printer main body 1 is provided with a paper feeding device 2 at the rear end, a paper receiving device 3 at the front end, and an image reading device 4 at the upper side.

  In the printing machine main body 1, a printing unit 5 is provided at a substantially middle portion in the front-rear direction, a plate making device 6 is provided above the printing unit 5, and a plate discharging device 7 is provided above the printing unit 5. A conveyance device 9 and a timing roller are provided between the paper feeding device 2 and the printing unit 5, and a paper discharge device 8 is provided between the printing unit 5 and the paper receiving device 3.

  The printing unit 5 includes a printing plate cylinder 11 in which an ink supply roller 10 is inscribed and rotationally driven in the direction of an arrow R, and a vertically movable pressing roller 12 that faces the printing plate cylinder 11 so as to come into contact with the printing plate cylinder 11 from below. And printing is performed on the upper surface of the printing paper P between the printing plate cylinder 11 and the pressing roller 12.

  The sheet feeding device 2 includes a base 15 installed on the floor and a sheet feeding unit 16 supported on the base 15 so as to be movable in the left-right direction (paper width direction). The sheet feeding unit 16 includes a sheet feeding table 17 that can be moved up and down, a pair of left and right width guides 13, an air suction type sheet feeding mechanism 18, a separating plate 19, and the like, and printing stacked on the sheet feeding table 17. The paper P is supplied to the transport mechanism one by one from the top.

  The base 15 is placed on the floor via the casters 20 and the like, and fixed at a predetermined position so as to be immovable by an extendable stopper leg 21. The paper feed unit 16 is supported by a pair of front and rear rails 22 laid on the upper surface of the base 15 so as to be movable in the left-right direction (paper width direction). It is connected to the rear end portion of the main body 1 so that movement in the paper width direction can be adjusted. That is, the paper feed unit 16 can change the position in the paper width direction with respect to the printing plate cylinder 11, and thereby the position of the image on the print paper P can be adjusted in the paper width direction. Yes.

  The paper discharge device 8 includes an air suction type belt conveyance mechanism 27 and a U-shaped formation guide mechanism 28 disposed in front of the air suction type belt conveyance mechanism 27. The air suction belt transport mechanism 27 includes a plurality of rows of paper discharge belts 30, suction boxes 31, and suction fans 32, and print paper P is discharged from the discharge belts by the air suction action of the suction boxes 31. It adsorbs on 31 and is conveyed in the conveyance direction F.

  The paper receiver 3 includes a paper receiver 41, an elevator device 48, a U-shaped state holding member 42 provided on the paper receiver 41, and a pair of left and right disposed above the paper receiver 41. The width guides 44, 45, the stop guide 46 disposed at the front end of the paper tray 41, the sensor 47 for detecting the stacking height of the paper loaded on the paper tray 41, and the operation of the paper tray 3. And a control unit (not shown) for controlling. The paper cradle 41 is moved up and down by the elevator device 48 as indicated by a virtual line in FIG.

  FIG. 2 shows an example of the U-shaped formation guide mechanism 28 of the paper discharge device 8, and a pair of left and right lifting guide portions 51 disposed along the upper surface (paper conveying surface) of the paper discharge belt 31 and each lifting guide. The narrowing guide portions 52 are provided on both sides of the portion 51 in the left-right direction. The narrowing guide portion 52 can be omitted.

  The lifting guide portion 51 is formed in a triangular pyramid shape, and when viewed from the side, the lifting guide portion 51 becomes higher at a predetermined angle from the rear end 51a having a height substantially coincident with the upper surface of the paper discharge belt 21, and the front end is increased. It is the highest. In addition, the width is increased from the center side to the end side when viewed from the front, and further, the width is increased from the center toward the front as viewed from above. According to this U-shaped formation guide mechanism 28, the left and right end portions of the paper P are gradually lifted by the lifting guide portion 51 while the central portion of the left and right width of the paper P is sucked by the suction belt 31, and the entire paper P is directed upward. It is transformed into a U shape and discharged forward (F).

(Configuration of paper receiving device)
3 is a schematic plan view of the stencil printing machine of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 3 IV-IV. In FIG. 4, the U-shaped state holding member 42 is symmetrically arranged with respect to the center line O1 of the left-right width and is formed in a triangular shape that increases from the center line O1 outward in the left-right width direction. ing. In addition, each U-shaped state holding member 42 has an end portion on the center side of the left and right widths supported by the paper receiving base 41 so as to be rotatable via a rotation shaft 42a, and rotates around the rotation shaft 42a. By doing so, the inclination angle θ1 with respect to the upper surface of the paper tray 41 can be changed. That is, the inclination angle θ1 can be reduced when stacking thick paper with high rigidity, and the inclination angle paper θ1 can be set large when stacking thin paper with low rigidity.

  The left and right width guides 44 and 45 are erected in a substantially vertical posture with respect to the upper surface of the paper tray 41 and are movable in the left and right direction (paper width direction). It is connected to drive motors 53 and 55 via transmission mechanisms 54 and 56, etc., and can be moved individually in the left-right direction (paper width direction).

  As shown in FIG. 4, the both width guides 44 and 45 are usually located at the guide position where the distance D1 between the two guide surfaces is narrower than the sheet width A1 (see FIG. 3) in the flat state. The printed paper P is guided to drop onto the U-shaped state holding member 42 while maintaining the U-shaped state between the guide members 44 and 45.

  In the present embodiment, the width guides 44 and 45 are separated from the guide position by the drive motors 53 and 55 to the outer side in the left-right direction as shown by phantom lines in addition to the structure described above. It can be moved to the retracted position. The distance W1 between the guide position and the retracted position in each width guide 44, 45 is the distance (D1 + 2W2) between the width guide 44 and the width guide 45 when at least both the width guides 44, 45 move to the retracted position. The position is set so as to be approximately at the position corresponding to the width of the paper P discharged from the printing machine main body 1.

  The sensor 47 detects the stacking height of the sheets P stacked on the paper receiving tray 41. The specific detection means is as follows. In other words, when the stacking height of the sheets P stacked on the sheet receiving tray 41 exceeds a predetermined height, the sheets P block the detection surface of the sensor 47, and the sensor 47 detects the sheets P. Further, when the stacking height of the paper P is less than the predetermined height, the sensor 47 does not detect the paper P because the paper P does not block the detection surface of the sensor 47. As described above, the sensor 47 detects whether or not the stacking height of the sheets P stacked on the sheet receiving tray 41 is equal to or higher than a predetermined height.

  When the sensor 47 detects the paper P stacked on the paper receiving tray 41, the control unit (not shown) of the paper receiving apparatus 3 lowers the paper receiving base 41 and opens / closes the width guides 44 and 45. It has become. The relationship between the paper detection of the sensor 47 and the operation of the paper receiving tray 41 and the operation of the width guides 44 and 45 will be described later.

  In FIG. 3, the stop guide 46 is disposed in a posture substantially perpendicular to the front-rear direction (paper discharge direction F), and is connected to a drive motor via a belt-type electric mechanism or the like (not shown). The stop guide 46 can be moved to a jogger position on the side opposite to the paper discharge direction F by a drive motor, as indicated by a virtual line in FIG. The U-shaped state holding members 42 are arranged in a plurality of pairs at intervals in the front-rear direction.

(Printing work and paper receiving processing work)
In FIG. 1, an original is read by an image reading device 4, a plate making device 6 makes a plate, and a stencil sheet (master) after plate making is mounted on a printing plate cylinder 11.

  When a predetermined number of print sheets P are stacked on the sheet feed tray 17 of the sheet feeder 2 and the printing operation is started, the print sheets P on the sheet feed tray 17 are transferred to the air adsorption type transport belt mechanism 18 and the separating plate 19. By the action, the sheets are fed one by one from the top to the transport mechanism 9 in the stencil printing machine main body 1.

  In the stencil printing machine main body 1, the printing paper P transported forward by the transport mechanism 9 is driven by the timing roller 26 in synchronization with the rotation of the printing plate cylinder 11, whereby the printing plate cylinder 11 and the pressing roller 12. In the meantime, the image forming portion is fed to the surface, and printing is performed on the surface of the printing paper in the image forming portion.

  The printed paper P is discharged to the paper discharge device 8 and conveyed forward while being attracted to the paper discharge belt 31, and is formed in an upward U-shape by the U-shaped formation guide mechanism 28. The paper is discharged above the paper tray 41 of the apparatus 3.

  In the paper receiving device 3, as shown in FIG. 4, the width guides 44 and 45 are located at the guide position, and the U-shaped printed paper is interposed between the width guides 44 and 45 in this state as described above. P is discharged. Then, the sheet P falls between the width guides 44 and 45 and is stacked on the U-shaped state holding member 42 while maintaining the U-shaped state.

  Further, since the stop guide 46 performs a jogger operation in the front-rear direction, the position in the front-rear direction of the sheets P stacked on the U-shaped state holding member 42 of the paper receiving base 41 is also neatly aligned.

(Relationship between detection of paper by sensor 47, operation of paper tray 41 and operation of width guides 44 and 45)
Hereinafter, the operation of the paper receiving table 41 and the width guides 44 and 45 when the sensor 47 detects the stacking height of the paper P stacked on the paper receiving table 41 will be described with reference to FIGS.
FIG. 5 shows ON / OFF of the operation of the paper cradle and the width guides 44 and 45 when the sensor 47 detects the predetermined paper stacking height for the first duration (t1). In FIG. 5, the time when the sensor 47 detects that the stacking height of the sheets P stacked on the sheet receiving tray has reached a predetermined height is t = 0. If the sensor 47 continues to detect for t1 time, the control unit lowers the paper receiving table 41 by the elevator device 48, assuming that the paper P is sufficiently loaded on the paper receiving table 41. When the paper tray 41 starts to descend, the stacking height of the paper P becomes lower than the predetermined height, and the sensor 47 does not detect it (time t1 ′). At the same time, the control unit stops the descent of the paper tray 41 by the elevator device 48.

  FIG. 6 shows ON / OFF of the operation of the paper tray 41 and the width guides 44 and 45 when the sensor 47 detects the predetermined paper stacking height for the second duration (t2). In FIG. 6, when the sensor 47 continues to detect for t1 time, the control unit lowers the paper tray 41 by the elevator device 48. Here, when the paper cradle 41 starts to descend, the sensor 47 normally does not detect the paper P. However, when the paper P is caught by the width guides 44 and 45, the paper cradle 41 is lowered. Nevertheless, the sensor 47 continues to detect the paper P. Therefore, if the sensor 47 continues to detect for t2 time, the control unit determines that the paper P is caught on the width guides 44 and 45, and stops the lowering of the paper tray 41 by the elevator device 48. Then, the control unit performs opening / closing operations of the width guides 44 and 45. In this embodiment, the time for opening and closing the width guides 44 and 45 is about 0.5 seconds. When the width guides 44 and 45 are opened and closed and the catch of the paper P in the width guides 44 and 45 is resolved (time t2 '), the sensor 47 does not detect the stacking height of the paper P.

  FIG. 7 shows ON / OFF of the operation of the paper tray 41 and the width guides 44 and 45 when the sensor 47 detects the predetermined paper stacking height for the third duration (t3). In FIG. 7, when the sensor 47 continues to detect for t <b> 1 time, the control unit lowers the paper tray 41 by the elevator device 48. Here, when the paper cradle 41 starts to descend, the sensor 47 normally does not detect the paper P. However, when the paper P is caught by the width guides 44 and 45, the paper cradle 41 is lowered. Nevertheless, the sensor 47 continues to detect the paper P. Therefore, if the sensor 47 continues to detect for t2 time, the control unit determines that the paper P is caught on the width guides 44 and 45, and stops the lowering of the paper tray 41 by the elevator device 48. Then, the control unit performs opening / closing operations of the width guides 44 and 45. If the sensor 47 continues to detect the paper P even if the width guides 44 and 45 are opened and closed, and the sensor 47 continues to detect for t3 hours, the control unit also performs the width guide 44 and 45 by opening and closing the width guides 44 and 45. , 45, it is determined that the catch of the paper P has not been eliminated, and the width guides 44, 45 are opened and closed. When the catch of the paper P in the width guides 44 and 45 is resolved by the further opening / closing operation of the width guides 44 and 45 (time t3 '), the sensor 47 does not detect the stacking height of the paper P.

  FIG. 8 shows that the operation of the paper tray 41 and the width guides 44 and 45 is turned ON / OFF when the sensor 47 continues to detect the paper stacking height even if the width guides 44 and 45 perform the opening / closing operation a predetermined number of times. Is shown. In FIG. 8, when the sensor 47 continues to detect for t1 time, the control unit lowers the paper tray 41 by the elevator device 48. Here, when the paper cradle 41 starts to descend, the sensor 47 normally does not detect the paper P. However, when the paper P is caught by the width guides 44 and 45, the paper cradle 41 is lowered. Nevertheless, the sensor 47 continues to detect the paper P. Therefore, if the sensor 47 continues to detect for t2 time, the control unit determines that the paper P is caught on the width guides 44 and 45, and stops the lowering of the paper tray 41 by the elevator device 48. Then, the control unit performs opening / closing operations of the width guides 44 and 45. If the sensor 47 continues to detect the paper P even if the width guides 44 and 45 are opened and closed, and the sensor 47 continues to detect for t3 hours, the control unit also performs the width guide 44 and 45 by opening and closing the width guides 44 and 45. , 45, it is determined that the catch of the paper P has not been eliminated, and the width guides 44, 45 are opened and closed. When the sensor 47 continues to detect the paper P, the control unit performs the opening / closing operation of the width guides 44 and 45 at predetermined time intervals (t3-t2, t4-t3). If the sensor 47 continues to detect the paper P even if the width guides 44 and 45 are further opened and closed a predetermined number of times (for example, twice in FIG. 8), the control unit opens and closes the width guides 44 and 45. In the operation, it is determined that the catch of the paper P in the width guides 44 and 45 is not eliminated, and the printing operation is stopped (time t5). Simultaneously with the stop of the printing operation, the detection operation of the paper P of the sensor 47 is also stopped.

  7 and 8, the paper tray 41 is not lowered after the opening / closing operation of the width guides 44 and 45, but may be lowered while the sensor 47 detects the paper P. FIG. 9 shows another example of the operation of the paper cradle 41 in which the paper cradle 41 moves down for a predetermined time while the sensor 47 detects the paper P. In FIG. 9, the predetermined number of times that the width guides 44 and 45 perform further opening / closing operations is seven, and even if the width guides 44 and 45 perform further opening / closing operations seven times, the sensor 47 causes the paper P to be opened. If the detection continues, it is determined that the catch of the paper P in the width guides 44 and 45 is not eliminated in the opening / closing operation of the width guides 44 and 45, and the printing operation is stopped (time t5 '). From time t1 to time t5 ', the paper receiving base 41 is lowered by Y1 every Y2 hours because the sensor 47 detects the paper P.

  According to the paper receiving device 3, when the printed paper P discharged from the printing machine main body in a U-shape is caught on the width guides 44 and 45 for a predetermined time or longer, the lowering of the paper receiving base 41 is stopped. It is possible to prevent the paper tray 41 from continuing to descend in a state where the paper P is caught by the width guides 44 and 45 and is not placed on the paper tray 41. Further, when the paper P is caught by the width guides 44 and 45, the width guides 44 and 45 are opened and closed, so that the catch of the paper P on the width guides 44 and 45 can be eliminated.

  When the opening / closing operation of the width guides 44 and 45 does not solve the catch of the paper P on the width guides 44 and 45, the width guides 44 and 45 are further opened and closed, so that the paper P is caught on the width guides 44 and 45. It can be solved more reliably.

  Since the printing operation is stopped when the catch of the paper P on the width guides 44 and 45 is not solved by the opening / closing operation of the width guides 44 and 45 a plurality of times, the paper P is caught in the width guides 44 and 45. A problem that a large amount of printed paper is discharged and a large amount of printed paper is stacked on the paper P caught on the width guides 44 and 45 can be prevented.

  Since the stop guide 46 aligns the edges in the discharge direction of the paper P by the jogger operation, the paper P can be aligned and stacked on the paper receiving tray.

  Since the U-shaped holding member 42 is erected on the upper surface of the paper receiving tray 41, the paper P discharged in the U-shaped state is also held in the U-shaped state on the paper receiving tray 41, and the paper receiving tray 41 The paper P can be easily aligned on the top.

  In the first embodiment, when the sensor 47 continues to detect the paper P for t2 hours, the control unit stops the lowering of the paper receiving base 41 by the elevator device 48 and simultaneously opens and closes the width guides 44 and 45. It is like that. However, it is also possible for the control unit to independently stop the lowering of the paper tray 41 and open / close the width guides 44 and 45, respectively. That is, if the sensor 47 continues to detect the paper P for t1 time, the control unit lowers the paper receiving tray 41 for a predetermined time and then stops the lowering. It may be performed earlier or later than the start of opening and closing operations 44 and 45 (time t2). Further, the opening / closing operation start (time t2) of the width guides 44 and 45 may be performed earlier than the start of lowering of the paper tray 41 (time t1).

(Modification of the width guide of the first embodiment)
(1) FIG. 10 shows a modification of the width guide. The left and right width guides 44 and 45 are formed in a stepped shape so that the upper half portion is closer to the U-shaped center line O1 side than the lower half portions 44a and 45a. Therefore, the distance D3 between the upper half portions of the left and right width guides 44 and 45 is further narrower than the distance D1 between the lower half portions.

  According to the above modification, when the paper P is stacked on the U-shaped state holding member 42, the paper P slightly expands, so that the paper can be stacked more orderly.

(2) FIG. 11 is an example applied to the ceiling plate type paper receiver 3, and the left and right width guides 44 and 45 are supported by the ceiling plate 61 so as to be movable in the left and right direction. Other configurations are the same as those in FIG.

  When the width guides 44 and 45 are erected on the upper surface of the paper tray 41, the vertical lengths of the width guides 44 and 45 are required from the upper surface of the paper tray 41 to the sheet stacking height. Here, according to the above-described modification, the width guides 44 and 45 are erected on the lower surface of the ceiling plate 61, so that the vertical lengths of the width guides 44 and 45 are the sheets P stacked on the paper tray 41. The width guides 44 and 45 can be shortened in the vertical direction.

(3) FIG. 12 is an example in which the ceiling plate type paper receiving device 3 supports the step-shaped width guides 44 and 45 similar to those in FIG. 10, and other configurations are the same as those in FIG. 10.

[Second Embodiment]
13 to 22, the left and right width guides 44 and 45 each have a paper receiving device 3 including first guide members 44-1 and 45-1 and second guide members 44-2 and 45-2. It is an example of a stencil printing machine. The same parts and portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  In FIG. 13, which is a perspective view of the entire stencil printing machine, the paper receiving device 3 has a ceiling plate 61, and left and right width guides 44 and 45 are supported on the ceiling plate 61 so as to be movable in the left-right direction. ing.

  FIG. 14 is a perspective view of the paper receiving device 3. Each of the width guides 44 and 45 includes first guide members 44-1 and 45-1 on the inner side of the left and right width, and first guide members 44-1 and 45-1 on the outer side of the left and right width. It is comprised by 2 guide members 44-2 and 45-2.

  In FIG. 15, the inner first guide members 44-1 and 45-1 are formed in a substantially vertical flat plate shape, and, for example, three rectangular window holes are formed at intervals in the front-rear direction. Yes. The outer second guide members 44-2 and 45-2 protrude below the lower ends of the first guide members 44-1 and 45-1 at the lower ends of the substantially vertical frame-shaped portions, and the frame-shaped portions. Further, pressing portions 44b and 45b that protrude inwardly in the lateral width are formed.

  The first guide members 44-1, 45-1 and the second guide members 44-2, 45-2 are independently driven by drive motors 53 a, 53 b, 55 a via belt transmission mechanisms 54 a, 54 b, 56 a, 56 b. , 55b, and each guide member 44-1, 45-1, 44-2, 45-2 can move in the left-right direction as a single unit.

  In FIG. 16, the first guide member 45-1 on the right side is suspended from a pair of guide rails 63 that extend from the ceiling plate 61 and extend in the left-right width direction. The belt-type reduction mechanism 67a is linked to the corresponding drive motor 55a.

  In FIG. 15, the left first guide member 44-1 is also moved in the left-right direction to a pair of guide rails 63 that are installed on the ceiling plate 61 and extend in the left-right width direction, like the right first guide member 45-1. It is suspended freely and is linked and linked to a corresponding drive motor 53a via a belt transmission mechanism 54a and a belt-type reduction mechanism 66a.

  In FIG. 17, the second guide member 45-2 on the right side is suspended by the pair of guide rails 63 so as to be movable in the left-right direction, and corresponding driving is performed via the belt transmission mechanism 56b and the belt-type reduction mechanism 67b. The motor 55b is interlocked and connected.

  In FIG. 15, the second guide member 44-2 on the left side is also moved in the left-right direction to a pair of guide rails 63 that are installed on the ceiling plate 61 and extend in the left-right width direction, like the second guide member 45-2 on the right side. It is suspended freely and is linked to a corresponding drive motor 53b via a belt transmission mechanism 54b and a belt-type reduction mechanism 66b.

  In FIG. 18, each of the second guide members 44-2 and 45-2 is generally such that the pressing surface of the pressing portions 44b and 45b at the lower end is substantially the same as the guide surface of the first guide members 44-1 and 44-2. It is supported so as to be positioned in the same vertical plane, and is reciprocated outward in the paper width direction with respect to each first guide member 44-1, 45-1 by each drive motor 53b, 55b. Therefore, jogger operation can be performed.

(Paper receiving processing work)
The first guide members 44-1 and 45-1 perform paper receiving processing work similar to the width guides 44 and 45 in the first embodiment. Further, the second guide members 44-2 and 45-2 perform a jogger operation for every predetermined number of discharged sheets.

  That is, as in the paper receiving process in the first embodiment, the first guide members 44-1 and 45-1 are located at the guide positions, and the first guide members 44-1 and 45-1 in this state are in this state. In the meantime, the printed paper P in the U-shape is discharged as described above. Then, the paper P falls between the first guide members 44-1 and 45-1 and is stacked on the U-shaped state holding member 42 while maintaining the U-shaped state.

  In the state where the sheets P are stacked on the U-shaped state holding member 42 as described above, the left and right second guide members 44-2 and 45-2 are positioned at the guide positions shown in FIG. From this state, it moves back and forth by a predetermined distance outward in the lateral width. FIG. 19 shows a process in which the second guide members 44-2 and 45-2 perform a jogger operation. The left and right first guide members are both positioned at the guide position, and the left and right second guide members 44-2 and 45-2 reciprocate in the left-right width between the state of FIG. 18 and the state of FIG. . That is, the left and right second guide members 44-2 and 45-2 perform a jogger operation, and the right and left edges of the paper P are aligned by the pressing portions 44b and 45b of the second guide members 44-2 and 45-2. When the sheet P is tilted to the right or left as viewed from above, the sheet P is corrected to extend straight in the front-rear direction.

(Relationship between detection of paper by sensor 47, operation of paper tray 41 and operation of first guide members 44-1, 45-1)
In the second embodiment, the operation of the paper receiving tray 41 with respect to the paper detection by the sensor 47 is the same as in the first embodiment. In the second embodiment, the operation of the first guide members 44-1 and 45-1 with respect to the paper detection by the sensor 47 is the same as the operation of the width guides 44 and 45 in the first embodiment.

  The width guides 44 and 45 include first guide members 44-1 and 45-1 and second guide members 44-2 and 45-2. Therefore, the first guide members 44-1 and 45-1 can be opened and closed, and the catch of the paper P on the width guides 44 and 45 can be eliminated. Since the second guide members 44-2 and 45-2 align the edges in the width direction of the paper P by the jogger operation, the paper P can be aligned and stacked on the paper tray 41.

  When the opening and closing operation of the first guide members 44-1 and 45-1 does not eliminate the catch of the paper P on the first guide members 44-1 and 45-1, the first guide members 44-1 and 45-are further released. Since 1 opens and closes, the catch of the paper P on the first guide members 44-1 and 45-1 can be more reliably eliminated.

  Since the printing operation is stopped when the first guide members 44-1 and 45-1 are opened and closed several times and the catch of the paper P on the first guide members 44-1 and 45-1 is not resolved, the printing operation is stopped. A large amount of printed paper is discharged in a state where P is caught on the first guide members 44-1, 45-1, and a large amount of printed paper is printed on the paper P caught on the first guide members 44-1, 45-1. It is possible to prevent a problem that sheets are stacked.

  Since the first guide members 44-1, 45-1 and the second guide members 44-2, 45-2 are erected on the lower surface of the ceiling plate 61, the first guide members 44-1, 45-1, The length of the two guide members 44-2 and 45-2 in the vertical direction may be a length that allows the sheets P stacked on the paper receiving tray 41 to be aligned (a length that allows the upper portions of the stacked sheets P to be aligned). The vertical lengths of the first guide members 44-1, 45-1 and the second guide members 44-2, 45-2 can be shortened.

  Other effects are the same as those of the first embodiment.

  In the second embodiment, when the sensor 47 continues to detect the paper P for t2 hours, the control unit stops the lowering of the paper receiving base 41 by the elevator device 48, and at the same time, the first guide members 44-1, 45-. 1 is opened and closed. However, it is also possible for the control unit to independently stop the lowering of the paper tray 41 and open / close the first guide members 44-1, 45-1. That is, if the sensor 47 continues to detect the paper P for t1 time, the control unit lowers the paper receiving tray 41 for a predetermined time and then stops the lowering. It may be performed earlier or later than the opening / closing operation start (time t2) of the guide members 44-1, 45-1. Further, the opening / closing operation start (time t2) of the first guide members 44-1, 45-1 may be performed earlier than the start of lowering of the paper tray 41 (time t1).

(Modification in the second embodiment)
(1) In the modification examples of the width guides shown in FIGS. 20 to 22, the width guides 44 and 45 include first guide members 44-1 and 45-1 and second guide members 44-2 and 45-2, respectively. In the paper receiving apparatus, the guide members 44-1, 45-1, 44-2, 45-2 are supported on the paper receiving base 41 so as to be movable in the left-right direction. FIG. 20 shows a paper receiving apparatus having left and right first guide members 44-1 and 45-1 and second guide members 44-2 and 45-2. Both show the state of being located at the guide position.

  In FIG.21 and FIG.22, each guide member 44-1, 45-1, 44-2, 45-2 is formed in the comb shape seeing from the side. Specifically, each of the first guide members 44-1 and 45-1 is composed of two plate-like portions arranged at intervals in the front-rear direction, and the second guide members 44-2 and 45-2. Is composed of three plate-like portions arranged at intervals in the front-rear direction, and the first guide is provided between the plate-like portions of the second guide members 44-2 and 45-2 in the front-rear direction. Plate members of members 44-1, 45-1 are arranged.

  In this modified example, the outer second guide members 44-2 and 45-2 are usually positioned outwardly in the lateral width from the inner first guide members 44-2 and 45-2, and the jogger operation is performed. When performing, it is comprised so that it may move inward of the left-right width to the same vertical plane as the guide surface of the 1st guide members 44-1, 45-1.

  Of course, as in the structure of FIGS. 13 to 18, the pressing surface of the second guide member can be aligned with the guide surface of the first guide member in a normal state.

(2) In the modification shown in FIG. 23, the inner first guide members 44-1 and 45-1 are located on the inner side of the left and right widths of the upper half portion than the lower half portion 44 a, as in FIG. 12. It is formed like a step. In this modified example as well, the guide members 44-1, 44-2, 45-1, and 45-2 are respectively formed from plate portions arranged at intervals in the front-rear direction, as in FIGS. It is formed in a comb shape.

(3) The modification shown in FIG. 24 is a paper receiving device provided with a ceiling board 61. The comb-shaped first guide members 44-1, 45-1 and the second guide member 44 similar to those shown in FIGS. -2, 45-2.

(4) FIG. 25, in the paper receiving apparatus provided with the ceiling board 61, supports the left and right width guides 44 and 45 having the first guide members 44-1 and 45-1 having a staircase shape, as in FIG. This is an example.

  The present invention is not limited to the structure of the embodiment described above, and includes various modifications that can be considered without departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Printer main body 2 Paper feeder 3 Paper receiving device 5 Printing unit 8 Paper discharge device 28 U-shaped formation guide mechanism 41 Paper receiving stand 42 U-shaped state holding member 44, 45 Width guide 44-1, 45-1 First guide Member 44-2, 45-2 Second guide member 46 Stop guide 47 Sensor 48 Elevator device 53, 55 Drive motor 53a, 53b, 55a, 55b Drive motor 61 Ceiling plate

Claims (11)

A paper cradle for loading printed paper discharged in a U-shape from the printer body;
Elevating means for moving the paper cradle up and down;
Detecting means for detecting a stacking height of the paper loaded on the paper tray;
A pair of width guides disposed on the paper cradle at guide positions having a narrower interval than the width of the paper, and restricting both end positions in the width direction of the paper;
A paper receiving device including a control unit for controlling operation;
The pair of width guides are movable between the guide position and a retracted position away from the guide position outward in the paper width direction.
The control unit is
And a control unit that, when the detection unit detects a predetermined sheet stacking height for a first duration time, lowers the paper tray by the elevating unit and then stops the predetermined time.
And a control for performing an opening / closing operation of returning the pair of width guides to the guide position after moving the pair of width guides to the retracted position when the detection unit detects a predetermined sheet stacking height for a second duration. ,
After the control unit performs the opening / closing operation of the pair of width guides, the detection unit continues to detect a predetermined sheet stacking height even if a third duration longer than the second duration has elapsed. The paper receiving apparatus , wherein the control unit further performs an opening / closing operation of the pair of width guides at predetermined time intervals .
A paper cradle for loading printed paper discharged in a U-shape from the printer body;
Elevating means for moving the paper cradle up and down;
Detecting means for detecting a stacking height of the paper loaded on the paper tray;
A pair of width guides disposed on the paper cradle at guide positions having a narrower interval than the width of the paper, and restricting both end positions in the width direction of the paper;
A paper receiving device including a control unit for controlling operation;
The pair of width guides are movable between the guide position and a retracted position away from the guide position outward in the paper width direction.
When the detection means detects a predetermined paper stacking height for a first duration, the control unit lowers the paper cradle by the elevating means,
When the detection means detects a predetermined sheet stacking height for a second duration longer than the first duration, the control unit stops the descent of the paper cradle, and the control unit further controls the pair of pairs. A paper receiving device, wherein the width guide is moved to the retracted position and then returned to the guide position to perform an opening / closing operation.
After the control unit performs the opening / closing operation of the pair of width guides, the detection unit continues to detect a predetermined sheet stacking height even if a third duration longer than the second duration has elapsed. The paper receiving apparatus according to claim 2 , wherein the control unit further performs an opening / closing operation of the pair of width guides every predetermined time.
A printing machine comprising the paper receiving device according to claim 1 or 3 ,
Even if the control unit repeats the further opening / closing operation of the pair of width guides a predetermined number of times, if the detection unit continues to detect a predetermined sheet stacking height, the control unit stops the printing operation. A printing press.
A paper cradle for loading printed paper discharged in a U-shape from the printer body;
Elevating means for moving the paper cradle up and down;
Detecting means for detecting a stacking height of the paper loaded on the paper tray;
A pair of width guides disposed on the paper cradle at guide positions having a narrower interval than the width of the paper, and restricting both end positions in the width direction of the paper;
A paper receiving device including a control unit for controlling operation;
Each of the pair of width guides includes a first guide member and a second guide member,
The pair of first guide members are movable between the guide position and a retracted position away from the guide position outward in the paper width direction.
The pair of second guide members are located outside the first guide member in the paper width direction and are movable to a jogger position where the guide surface is flush with the guide surface of the first guide member. And
The control unit is
And a control unit that, when the detection unit detects a predetermined sheet stacking height for a first duration time, lowers the paper tray by the elevating unit and then stops the predetermined time.
A control for performing an opening / closing operation of returning the pair of first guide members to the guide position after the pair of first guide members are moved to the retracted position when the detection unit detects a predetermined sheet stacking height for a second duration;
And a control for performing jogger in the paper width direction by moving the pair of second guide members to the jogger position for each predetermined number of paper ejected sheets.
A paper cradle for loading printed paper discharged in a U-shape from the printer body;
Elevating means for moving the paper cradle up and down;
Detecting means for detecting a stacking height of the paper loaded on the paper tray;
A pair of width guides disposed on the paper cradle at guide positions having a narrower interval than the width of the paper, and restricting both end positions in the width direction of the paper;
A paper receiving device including a control unit for controlling operation;
Each of the pair of width guides includes a first guide member and a second guide member,
The pair of first guide members are movable between the guide position and a retracted position away from the guide position outward in the paper width direction.
The pair of second guide members are located outside the first guide member in the paper width direction and are movable to a jogger position where the guide surface is flush with the guide surface of the first guide member. And
When the detection means detects a predetermined paper stacking height for a first duration, the control unit lowers the paper cradle by the elevating means,
When the detection means detects a predetermined sheet stacking height for a second duration longer than the first duration, the control unit stops the descent of the paper cradle, and the control unit further controls the pair of pairs. An opening / closing operation for returning the first guide member to the guide position after moving the first guide member to the retracted position,
The control unit is configured to perform jogging in the sheet width direction by moving the pair of second guide members to the jogger position for each predetermined number of ejected sheets. Paper receiving device.
After the controller performs the opening / closing operation of the pair of first guide members, the detection unit detects a predetermined sheet stacking height even if a third duration longer than the second duration has elapsed. The paper receiving apparatus according to claim 5 or 6, wherein when the control is continued, the control unit further performs an opening / closing operation of the pair of first guide members every predetermined time.
A printing machine comprising the paper receiving device according to claim 7,
Even if the control unit repeats the further opening / closing operation of the pair of first guide members a predetermined number of times, the control unit stops the printing operation when the detection unit continues to detect a predetermined sheet stacking height. A printing machine that is supposed to let you.
A stop guide with which an edge in the paper discharge direction abuts is disposed on the paper tray,
8. The control unit is configured to perform a jogger in a paper discharge direction by moving the stop guide to a jogger position opposite to the paper discharge direction. The paper receiver according to any one of the above.
A ceiling plate is disposed directly above the paper cradle;
The paper receiving apparatus according to any one of claims 1, 2, 3, 5, 6, 7, and 9, wherein the pair of width guides are erected on a lower surface of the ceiling board.
  A U-shaped state holding member that holds the paper stacked on the paper tray in a U-shape is provided upright on an upper surface of the paper tray. The paper receiving apparatus according to any one of 7, 9, and 10.

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