JP4006070B2 - Paper receiving device for rotary stencil printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper receiving device for a rotary stencil printing press.
[0002]
[Prior art]
A paper receiving device of a conventional rotary stencil printing machine generally includes a stop guide plate and a pair of width guide plates on a paper receiving tray, and printing discharged from the printer main body between the stop guide plates and the pair of width guide plates. The used paper is stacked in a state where it is aligned to some extent.
[0003]
However, when the width guide plate is exactly aligned with the paper size, the paper will be aligned best, but depending on the paper discharge status from the printing machine, the paper will be shifted to one width guide plate side and the end of the paper May be turned up along the side surface of the guide plate and cause unevenness of the paper. In addition, the leading edge position of the paper slightly varies with respect to the stop guide plate due to rebound when it comes into contact with the stop guide plate.
[0004]
It is desirable to minimize such paper edge irregularities and stack the papers more neatly.
[0005]
[Problems to be solved by the invention]
Therefore, a technical problem to be solved by the present invention is to provide a paper receiving device for a rotary stencil printing press that can arrange sheets more neatly and stack them on a paper receiving tray.
[0006]
[Means for solving the problems and actions / effects]
In order to solve the above technical problem, the present invention provides a paper receiving device for a rotary stencil printing press having the following configuration.
[0011]
A paper receiving device of a rotary stencil printing machine is provided with a paper receiving base that is adjacent to a paper discharge portion of a printing machine main body from which printed paper is sequentially discharged and extends substantially along the paper discharge direction below the paper discharge portion. A stop guide plate that faces the paper discharge unit above the paper tray and extends in a direction substantially perpendicular to the paper discharge direction; and the paper discharge unit and the stop guide plate above the paper tray and A pair of width guide plates extending substantially parallel to the paper discharge direction at substantially equal intervals as the width of the paper discharged from the paper discharge unit, and the stop guide plate on the paper receiving table, This is a type in which printed sheets are stacked between a pair of the width guide plates. The paper receiver includes width guide plate driving means. The width guide plate driving means includes a position where the pair of width guide plates approach or abut each of the left and right side edges of the paper stacked on the paper tray, and a direction approximately perpendicular to the paper discharge direction from the vicinity. A pair of the width guide plates are reciprocated in a direction to contact and separate from each other between the separated retracted positions. The width guide plate driving means gradually moves the pair of width guide plates in a direction approaching each other while the paper discharged from the paper discharge unit is dropped until landing on the paper receiving tray. A pair of the width guide plates reach the vicinity position when landing on the paper tray or immediately before or after.
[0012]
According to the above configuration, the interval between the width guide plates is gradually reduced while the paper discharged from the paper discharge unit of the printing machine falls to the paper cradle. It contacts the plate and is pushed back in the width direction. Then, when the paper has landed on the paper cradle, or just before and after that, the width guide plate reaches the near position, so that the paper is in a predetermined position. Therefore, the sheets stacked on the paper tray can be more neatly arranged.
[0013]
The present invention also provides a paper receiving apparatus having another configuration.
[0014]
A paper receiving device of a rotary stencil printing machine is provided with a paper receiving base that is adjacent to a paper discharge portion of a printing machine main body from which printed paper is sequentially discharged and extends substantially along the paper discharge direction below the paper discharge portion. A stop guide plate that faces the paper discharge unit above the paper tray and extends in a direction substantially perpendicular to the paper discharge direction; and the paper discharge unit and the stop guide plate above the paper tray and A pair of width guide plates extending substantially parallel to the paper discharge direction at substantially equal intervals as the width of the paper discharged from the paper discharge unit, and the stop guide plate on the paper receiving table, This is a type in which printed sheets are stacked between a pair of the width guide plates. The paper receiving device includes stop guide plate driving means. The stop guide plate driving means includes the stop guide plate between a vicinity position where the stop guide plate approaches or abuts the front end of the sheets stacked on the paper tray and a retracted position away from the vicinity position in the paper discharge direction. The plate is reciprocated in the paper discharge direction. The stop guide plate driving means retreats the stop guide plate in the paper discharge direction while the paper discharged from the paper discharge unit is dropped until landing on the paper tray, and the stop guide plate being retracted The leading edge of the paper discharged from the paper discharge unit is in contact with the paper.
[0015]
According to the above configuration, since the leading edge of the falling paper comes into contact with the stopping guide plate that retreats in the paper discharge direction, that is, escapes, the sound generated when the leading edge of the paper contacts the stopping guide plate is reduced. Can do. Further, since the rebound of the paper to the printer discharger side is reduced or does not occur, it is possible to prevent the occurrence of problems such as the paper rebounding to the paper discharger side of the printer and being caught.
[0016]
In the above-described configuration, the stop guide plate moves to a nearby position, thereby aligning the positions in the paper discharge direction. The stop guide plate may move to the close position after moving to the retracted position while the paper is falling, or may be moved to the close position after landing on the paper.
[0017]
Preferably, the stop guide plate driving means and / or the width guide plate drive means has an amplitude for reciprocating the stop guide plate and / or the width guide plate when the discharge speed of the paper discharged from the printing machine main body increases. Make it smaller.
[0018]
According to the above configuration, when the amplitude of the guide plate is reduced, the guide plate can be moved in a shorter time. Therefore, it is easy to increase the response speed of the guide plate when the paper discharge speed is increased. .
[0019]
Preferably, the stop guide plate driving means and / or the width guide plate driving means operate each time a plurality of sheets are discharged from the printing machine main body.
[0020]
According to the above configuration, the guide plate driving means operates intermittently and aligns the sheets for each of a plurality of sheets. Since the reciprocal motion is not repeated, adverse effects of inertial force and vibration are reduced, so that it is easy to increase the response speed of the guide plate when the paper discharge speed is increased. In addition, noise during driving is reduced. Furthermore, the durability of the guide plate driving means can be improved.
[0021]
Preferably, the stop guide plate driving unit and / or the width guide plate driving unit includes a stepping motor, a rotation control unit, an abnormality detection unit, and a rotation correction unit. The stepping motor drives the stop guide plate and / or the width guide plate. The rotation control unit provides a drive pulse signal to the stepping motor to control the rotation of the stepping motor. The pulse encoder is coupled to the stepping motor and rotates, and outputs a pulse signal having a frequency lower than that of the drive pulse signal in response to the drive pulse signal. The abnormality detection means is configured to detect the amount of rotation that the stepping motor should operate and the stepping motor actually operate according to the drive pulse signal given to the stepping motor by the rotation control means and the pulse signal from the pulse encoder. A rotation error amount with respect to the rotation amount thus obtained is obtained, and when the rotation error amount exceeds a predetermined amount, an abnormal operation of the stepping motor is detected. The rotation correction means is the drive that the rotation control means gives to the stepping motor using the rotation error amount obtained by the abnormality detection means when the abnormality detection means detects an operation abnormality of the stepping motor. Correct the pulse signal.
[0022]
In the above configuration, a stepping motor having few mechanical components and excellent durability and responsiveness is used as a drive source of the guide plate driving means. The rotation control means can control the position of the guide plate by determining the position of the guide plate from the number of pulses of the drive pulse signal applied to the stepping motor. Further, the moving speed of the guide plate can be controlled by changing the frequency of the driving pulse signal, that is, the interval between the pulses. The pulse encoder has a frequency lower than that of the driving pulse signal and has a small resolution, so that it is not easily affected by noise. The abnormality detection means detects an abnormal operation of the stepping motor such as step-out or overrun. The rotation correction unit corrects the drive pulse when the operation of the stepping motor is abnormal so that the guide plate performs a predetermined operation. For example, the number of drive pulses is corrected.
[0023]
Therefore, the operation failure of the guide plate can be reduced, and the sheets stacked on the paper receiving tray can be arranged more neatly.
[0024]
Preferably, the abnormality detection unit is configured to output the stepping signal when the rotation control unit does not output the pulse signal from the pulse encoder even though the driving pulse signal having a predetermined number of pulses or more is supplied to the stepping motor. A step-out detection means for detecting step-out of the motor is included. The rotation correction means includes low speed correction means for lowering the frequency of the drive pulse signal given to the stepping motor by the rotation control means when the step-out detection means detects the step-out of the stepping motor.
[0025]
According to the above configuration, when the stepping motor becomes insufficient in torque and does not rotate even when a drive pulse is applied, that is, when the guide plate does not move, the rotation speed of the stepping motor is reduced to increase the torque, and the guide plate is accurately adjusted. It can be operated. Therefore, the operation failure of the guide plate can be reduced, and the sheets stacked on the paper receiving tray can be arranged more neatly.
[0026]
The present invention further provides a paper receiving device for a rotary stencil printing machine having various configurations as follows.
[0027]
A paper receiving device of a rotary stencil printing machine is provided with a paper receiving base that is adjacent to a paper discharge portion of a printing machine main body from which printed paper is sequentially discharged and extends substantially along the paper discharge direction below the paper discharge portion. A stop guide plate that faces the paper discharge unit and extends in a direction substantially perpendicular to the paper discharge direction above the paper tray, and the paper discharge unit and the stop guide plate above the paper tray and A pair of width guide plates extending substantially parallel to the paper discharge direction at substantially equal intervals as the width of the paper discharged from the paper discharge unit, and the stop guide plate on the paper receiving table, This is a type in which printed sheets are stacked between a pair of the width guide plates. A plurality of rows of grooves extending in a direction substantially orthogonal to the paper discharge direction is provided on the upper surface of the paper receiving plate. The pair of width guide plates are supported so as to be movable toward and away from each other, and a plurality of protrusions projecting downward are provided at the lower ends of the pair of width guide plates. The protrusions enter the grooves of the paper tray.
[0028]
According to the above configuration, the protrusion of the width guide plate prevents the paper on the paper receiving base from entering under the width guide plate. Therefore, the lower sheet among the sheets stacked on the paper tray is also accurately positioned by the width guide plate. Therefore, the sheets stacked on the paper tray can be more neatly arranged.
[0029]
A paper receiving device of a rotary stencil printing machine is provided with a paper receiving base that is adjacent to a paper discharge portion of a printing machine main body from which printed paper is sequentially discharged and extends substantially along the paper discharge direction below the paper discharge portion. A stop guide plate that faces the paper discharge unit above the paper tray and extends in a direction substantially perpendicular to the paper discharge direction; and the paper discharge unit and the stop guide plate above the paper tray and A pair of width guide plates extending substantially parallel to the paper discharge direction at substantially equal intervals as the width of the paper discharged from the paper discharge unit, and the stop guide plate on the paper receiving table, This is a type in which printed sheets are stacked between a pair of the width guide plates. The paper receiving apparatus includes guide plate automatic setting means and fine adjustment means. The guide plate automatic setting means receives information from the printer main body about the standard size of the paper to be printed, and based on the information on the standard size, the guide guide plate and the width guide plate are positioned at predetermined positions corresponding to the standard size. Set the position automatically. The fine adjustment means finely adjusts the position of the stop guide plate in the paper discharge direction and the position of the width guide plate in the direction of contacting and separating from each other with respect to the predetermined position.
[0030]
According to the above configuration, even if the size of the standard size paper is slightly different from the standard size, fine adjustment can be made so that the position of the guide plate is optimized. Therefore, the sheets stacked on the paper tray can be more neatly arranged.
[0031]
A paper receiving device of a rotary stencil printing machine is provided with a paper receiving base that is adjacent to a paper discharge portion of a printing machine main body from which printed paper is sequentially discharged and extends substantially along the paper discharge direction below the paper discharge portion. A stop guide plate that faces the paper discharge unit above the paper tray and extends in a direction substantially perpendicular to the paper discharge direction; and the paper discharge unit and the stop guide plate above the paper tray and A pair of width guide plates extending substantially parallel to the paper discharge direction at substantially equal intervals as the width of the paper discharged from the paper discharge unit, and the stop guide plate on the paper receiving table, This is a type in which printed sheets are stacked between a pair of the width guide plates. The paper receiving apparatus includes guide plate arbitrary setting means and paper information transmission means. The guide plate arbitrary setting means arbitrarily sets the position of the stop guide plate in the paper discharge direction and the position of the width guide plate in the direction of contacting and separating from each other. The paper information transmission means transmits the position information of the stop guide plate and the width guide plate set by the guide plate arbitrary setting means to the printing press main body.
[0032]
According to the above configuration, the guide plate can be set at the optimum position by the guide plate arbitrary setting means even for a free-size sheet having an arbitrary size other than the fixed size. Therefore, the paper receiving device can more neatly arrange non-standard free size paper.
[0033]
Furthermore, by feeding back the position information of the guide plate to the printing press main body, the printing press main body can recognize the paper size without inputting the paper size separately in the printing press main body. Therefore, the printer main body can easily cope with non-standard size free-size paper.
[0034]
Preferably, a storage unit, a paper type selection unit, and a guide plate initial setting unit are further provided. The storage means stores the positions of the stop guide plate and the width guide plate when the positions of the stop guide plate and / or the width guide plate are changed by the guide plate arbitrary setting means. The paper type selection means selects a standard size paper or an arbitrary size paper. The guide plate initial setting means automatically sets the stop guide plate and the width guide plate at a predetermined position corresponding to the selected standard size when the standard size paper is selected by the paper type selection means. . On the other hand, the guide plate initial setting means sets the stop guide plate and the width guide plate at the positions stored in the storage means when a paper of an arbitrary size is selected by the paper type selection means, The guide plate arbitrary setting means is operable.
[0035]
According to the above configuration, when the position of the guide plate is arbitrarily set, the position is stored. When the position of the guide plate is arbitrarily set again, the memory is updated to the position at that time. That is, the latest position is always stored. When an arbitrary size paper is selected by the paper type selection means, the guide plate is set at the stored position, that is, the position when the arbitrary position is set immediately before. If necessary, the guide plate can be moved to an arbitrary position by the guide plate arbitrary setting means. Therefore, for example, the guide plate setting operation is simplified when, for example, a standard-size sheet is printed after an arbitrary-size sheet is printed and then an arbitrary-size sheet having the same size is printed again.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Below, the paper receiving apparatus 10 of the rotary stencil printing press according to an embodiment of the present invention shown in FIGS. 1 to 13 will be described in detail.
[0037]
First, the rotary stencil printing machine 1 will be schematically described with reference to the front view of FIG. The rotary stencil printing machine 1 supplies printing paper one by one between the plate cylinder 4 and the press roller 6 from one of the paper feed trays 2a, 2b, 2c, and then discharges the printed paper. The paper is discharged to the paper receiving device 10 by the belt 7.
[0038]
Specifically, the paper feed tables 2a, 2b, and 2c include first and second paper feed tables 2a and 2b provided at the lower portion of the printing press main body, and a manual paper feed stand provided on one side of the printing press main body. 2c. The first and second paper feed trays 2a and 2b are configured as bottom plates of a paper cassette (not shown) that are normally stored in the printer main body and pulled out from the front side of the printer main body when paper is replenished. The manual feed tray 2c is used in a state where it is exposed to the outside from the side surface of the printing press main body as shown in the drawing as needed, and is normally stored in a folded state on one side of the printing press main body. The first and second paper feed trays 2a and 2b can place a large amount of paper (for example, 1000 sheets), whereas the manual paper feed base 2c can carry a small amount of paper (for example, several to several tens of sheets). Can be placed. The selected sheets on the sheet feed trays 2a, 2b, and 2c are separated and conveyed one by one by known means such as a sheet feeding ring, a separating plate, and a conveyance roller, and the plate cylinder 4 and the press roller at a predetermined timing. 6 is sent out.
[0039]
A stencil sheet made by the plate making unit 5a is mounted on the plate cylinder 4. The plate making unit 5a reads a document placed on a document table (not shown) provided at the upper part of the printing machine main body, enlarges or reduces it if necessary based on the image, makes a stencil sheet, and attaches it to the plate cylinder. To do. The stencil sheet mounted on the plate cylinder 4 is removed by the removing portion 5b. The plate cylinder 4 is supplied with ink therein and rotates in synchronization with the paper feed speed. The press roller 6 is disposed below the plate cylinder 4 so as to be able to contact and separate. The press roller 6 is raised when the paper passes between the plate cylinder 4 and the press roller 6 and presses the paper against the plate cylinder 4 side. As a result, ink that has passed through the plate cylinder 4 and the stencil sheet adheres to the paper and is printed. The lower surface of the printed paper is supported by the paper discharge belt 7 and is discharged from the paper discharge unit 9 to the paper receiving device 10. A paper discharge sensor 8 for detecting paper discharge is provided immediately before the paper discharge unit 9.
[0040]
Next, the paper receiver 10 will be described with reference to the perspective views of FIGS. 1 and 2, the perspective view of FIG. 3, and the cross-sectional view of FIG.
[0041]
The paper receiver 10 includes a paper receiver 12 that extends from the lower side of the paper output section 9 substantially along the paper output direction 90, a stop guide plate 22 disposed on the paper receiver 12, and a pair of width guide plates 32. And a guide plate driving mechanism for moving the guide plates 22 and 32, and the printed sheets are sequentially stacked on the paper tray 12 with the sides aligned between the guide plates 22 and 32. It is like that. The paper feed tray 12 is provided with a paper presence / absence sensor 18 for detecting whether or not there is paper on the paper feed tray 12.
[0042]
Specifically, the stop guide plate 22 faces the paper discharge unit 9 of the printing machine 1, extends in a direction orthogonal to the paper discharge direction 90 of the printed paper, and has been printed from the paper discharge unit 9 into the air. The front edge of the paper comes into contact. The stop guide plate 22 is movably supported in the paper discharge direction 90 by a stop guide plate support member 26 that slides along the parallel guide rail 20 fixed in the paper discharge direction 90 inside the paper tray 12. Yes.
[0043]
The pair of width guide plates 32 extend in parallel along the paper discharge direction 90 between the paper discharge unit 9 and the stop guide plate 22 and come into contact with the left and right side edges of the printed paper. ing. The pair of width guide plates 32 are disposed in the paper discharge direction 90 by a stop guide plate support member 36 that slides along the parallel guide rails 30 fixed in a direction perpendicular to the paper discharge direction 90 inside the paper tray 12. Are supported so as to be movable in a direction perpendicular to each other. A plurality of comb-like projections 34 are provided at the lower ends of the pair of width guide plates 32, and a plurality of rows extending in a direction perpendicular to the conveyance direction 90 provided on the upper surface 13 of the paper receiving tray 12. The groove 14 is slidably fitted. This prevents the paper on the paper receiving tray 12 from entering the gap between the upper surface of the paper receiving tray 12 and the lower end of the width guide plate 32 and shifting the position of the paper.
[0044]
Light shielding plates 28 and 38 are respectively fixed to the guide plate support members 26 and 36, and light shielding sensors 29 and 39 are disposed at appropriate positions on the paper receiving tray 12. Are in the home position moved to the outermost position, the light shielding plates 28 and 38 shield the light shielding sensors 29 and 39 from light.
[0045]
Each guide plate 22, 32 is driven by a guide plate drive mechanism. The guide plate driving mechanism is provided with two sets in total, one set for the stop guide plate 22 and one set for the pair of width guide plates 32.
[0046]
The guide plate drive mechanism for the stop guide plate 22 generally includes a drive belt 40 supported by a pair of pulleys 44 along the parallel guide rails 20 and a stepping motor 42 that rotates one pulley 44. The stepping motor 42 rotates when a drive pulse signal is given from a drive circuit (not shown). One pulley 44 is rotated by the rotation of the stepping motor 42, and the drive belt 40 circulates between the pair of pulleys 44 in both directions. A lower portion 27 of the stop guide plate support member 26 holds the drive belt 40 and moves together with the drive belt 40. Therefore, the stop guide plate 22 is driven in the paper discharge direction 90 along the parallel guide rail 20.
[0047]
The guide plate drive mechanism for the pair of width guide plates 32 is also configured in substantially the same manner, and the drive belt 40 supported by the pair of pulleys 44 circulates along the parallel guide rail 30 by the rotation of the stepping motor 42. It is like that. The lower part of each width guide plate support member 36 sandwiches both sides of the drive belt 40 and moves with the drive belt 40 by an equal distance in the direction of contact with and away from each other. Accordingly, the pair of width guide plates 32 are driven along the parallel guide rails 30 by a distance equal to the direction in which they are in contact with and away from each other.
[0048]
Further, each guide plate driving mechanism is provided with a pulse encoder. In other words, the pulse plate 46 is coupled to one pulley 44, and the photo interrupter 48 is disposed so as to face the pulse plate 46. The pulse plate 46 has pulse marks arranged radially. The photo interrupter 48 detects the passage of the pulse mark on the pulse plate 46 and generates a pulse signal. The pulse plate 46 has a rough pulse mark so that the photo interrupter 48 outputs a lower frequency pulse (for example, one pulse) corresponding to the drive pulse (for example, two pulses) of the stepping motor 42.
[0049]
This pulse encoder is used to monitor the operation of the stepping motor 42 of the guide plate drive mechanism. For example, as shown in FIG. 9 (II), when the stepping motor 42 is operating normally, the pulse encoder outputs a coarse pulse signal corresponding to the drive pulse signal applied to the stepping motor 42. On the other hand, for example, when the stepping motor 42 overruns, as shown in FIG. 9 (III), even if it stops supplying the drive pulse signal to the stepping motor 42 and stops the rotation of the stepping motor 42, the pulse encoder Continues to output pulse signals. On the other hand, for example, when the stepping motor 42 steps out, as shown in FIG. 9 (IV), even if a drive pulse signal is given to the stepping motor 42, the stepping motor 42 does not rotate and the pulse encoder does not output a pulse signal. Thus, the operation of the stepping motor 42 can be monitored by comparing the drive pulse signal applied to the stepping motor 42 with the pulse signal from the pulse encoder. By the way, in the paper receiver of the printing press, the load on the stepping motor 42 varies greatly depending on the weight and stacking condition of the paper. At this time, if a driving force adapted to a heavy load is applied, the motor becomes large and the cost increases. In addition, the sound becomes louder. On the other hand, if the driving force is small, the risk of step-out increases, but it can be corrected by monitoring the pulses as described above.
[0050]
The paper receiving apparatus 10 is further provided with an operation panel 50 so that the positions of the stop guide plate 22 and the pair of width guide plates 32 can be arbitrarily set. That is, the stop guide plate 22 can be moved to both sides of the conveyance direction 90 by the operation of the switches 52 and 54, and the pair of width guide plates 32 can be moved to contact and separate from each other by the switches 56 and 58.
[0051]
Next, driving of the guide plates 22 and 32 will be described with reference to the timing chart of FIG. FIG. 5A shows the position of the pair of width guide plates 32, and FIG. 5B shows the position of the stop guide plate 22. Here, the “closed” position is a position in the vicinity where the guide plates 22 and 32 approach or come into contact with the paper at a predetermined position on the paper tray 12, and the “open” position is the position where the guide plates 22 and 32 are the paper tray. 12 shows a retracted position that is moved outward from a predetermined position on the paper. An arrow A indicates when the leading edge of the paper discharged from the printing press 1 contacts the stop guide plate 22.
[0052]
The pair of width guide plates 32 are in the open position as indicated by W1 when the leading edge of the paper discharged from the printing press 1 comes into contact with the stop guide plate 22, and the paper falls and lands on the paper receiving tray 12. Until then, it is in the open position. Then, after the paper has landed on the paper receiving tray 12, as indicated by W2->W3-> W4, the paper moves from the open position to the closed position and returns to the open position again. When the width guide plate 32 moves from the open position to the closed position, when the side edge of the paper landed on the paper receiving tray 12 hits the width guide plate 32, the paper is pushed in the width direction to a predetermined position.
[0053]
The stop guide plate 22 is in the open position as indicated by L1 when the leading edge of the paper discharged from the printing press 1 contacts the stop guide plate 22. Since the stop guide plate 22 is separated from the paper discharge unit 9 of the printing machine 1, the paper that has come into contact with the stop guide plate 22 bounces back to the paper discharge unit 9 of the printing machine 1, and causes trouble in the vicinity of the discharge unit 9. Is prevented. The stop guide plate 22 remains in the open position until the paper drops and lands on the paper tray 12. Then, after the paper has landed on the paper receiving tray 12, as indicated by L2->L3-> L4, the paper moves from the open position to the closed position and returns to the open position again. When the stop guide plate 22 moves from the open position to the closed position, the paper is pushed to a predetermined position when the front end of the paper hits the stop guide plate 22.
[0054]
The series of operations described above are executed in accordance with the paper discharge cycle. Since the guide plates 22 and 32 are displaced from the predetermined position and land on the paper receiving tray 12 and push the paper to the predetermined position, the paper on the paper receiving tray 12 can be neatly aligned.
[0055]
The guide plates 22 and 32 can be driven in other modes as shown in the timing chart of FIG. 6 shown in the same manner as FIG.
[0056]
That is, the pair of width guide plates 32 moves from the open position to the closed position as indicated by S1 before and after the leading edge of the paper comes into contact with the stop guide plate 22, and the paper is falling or the paper is placed on the paper cradle. The closed position is reached at or shortly after landing. As a result, the width direction positions of the sheets are aligned. And it returns to an open position as shown by S2->S3-> S4.
[0057]
The stop guide plate 22 moves from the closed position to the open position as indicated by T1 before and after the leading edge of the sheet comes into contact with the stop guide plate 22, and the leading edge of the sheet is stopped while being retracted in the paper discharge direction 90. It abuts on the guide plate 22. As a result, the sound when the paper comes into contact with the stop guide plate 22 is reduced, and the paper is prevented from coming back into contact with the stop guide plate 22 and rebounding to the paper discharge unit 9 of the printing press 1. Then, as indicated by T2->T3-> T4, the position returns to the closed position, and the position in the length direction of the paper is aligned with a predetermined position.
[0058]
By executing the above series of operations in accordance with the paper discharge cycle, the paper can be neatly aligned on the paper receiving tray 12.
[0059]
Next, the operation of the paper receiving apparatus 10 will be described with reference to the flowcharts of FIGS.
[0060]
As shown in FIG. 7, when the power is turned on, in step # 10, it is determined whether or not each guide plate 22, 32 is at the home position based on the output of the light shielding sensors 29, 39. In step # 12, the guide plates 22 and 32 are moved to the home position. Specifically, as shown in FIG. 9I, a drive pulse signal is given to the stepping motor 42 until the light shielding sensor, that is, the home position sensors 29 and 39 are turned off by the light shielding by the light shielding plates 28 and 38. .
[0061]
Next, in step # 14, a paper size setting operation is executed. Specifically, as shown in FIG. 8, in step # 30, based on the output of the paper presence sensor 18, it is determined whether or not there is a sheet on the paper tray 12, and if there is a sheet, in step # 32, An alarm is displayed on the panel of the printing press 1 and waits until the paper runs out of the paper tray 12. If there is no paper, it is determined in step # 34 whether the paper type selected on the printing press 1 side is a free size or a standard size. If the size is a free size, in step # 36, the guide plates 22 and 32 are moved to the positions stored in the memory and set at the previous setting of the free size. If it is not a free size, that is, if it is a standard size, in step # 38, the guide plates 22 and 32 are moved to positions corresponding to the selected standard size paper dimensions.
[0062]
Next, as shown in FIG. 7, in steps # 16 and # 18, the printing press 1 starts printing and waits until the paper discharge sensor 9 detects the discharge of the printed paper. If the paper discharge sensor 9 detects the discharge of the printed paper, in step # 20, for example, the guide plate 22 according to the paper size, the printing speed, the number of printed sheets, the height of the paper stacked on the paper receiving tray, and the like. , 32 is adjusted. When the predetermined timing is reached, a predetermined driving operation for reciprocating the guide plates 22 and 32 is executed in step # 22.
[0063]
Next, the operation of monitoring the operation of the stepping motor 42 using a pulse encoder and correcting the drive pulse signal if necessary will be described with reference to the flowcharts of FIGS.
[0064]
The operation of the stepping motor 42 is controlled by a drive pulse signal as shown in FIG. In parallel with this, as shown in FIG. 12, the operation of the stepping motor 42 is monitored by the pulse signal from the pulse encoder. Then, as shown in FIG. 11, the number of pulses of the drive pulse signal to be given to the stepping motor 42 from the next time is corrected based on the monitoring result.
[0065]
First, the control of the operation of the stepping motor will be described with reference to FIG. When the drive of the guide plates 22 and 32 is started in step # 50, the drive pulse signal is given to the stepping motor 42 until the number of pulses of the drive pulse signal reaches the predetermined value X in steps # 52 to # 56. When the number of pulses of the drive pulse signal reaches a predetermined value X, the rotation of the motor is stopped. Then, in steps # 58 and # 60, the delay timer waits for the elapse of a predetermined time, and as will be described in detail later, the pulse monitoring operation of FIG. Execute pulse calculation to correct the number of pulses of the drive pulse signal given to the motor.
[0066]
Next, a monitoring flow of the operation of the stepping motor 42 by the pulse signal from the pulse encoder shown in FIG. 12 will be described. In step # 90, the rotation of the stepping motor 42 is awaited. When the stepping motor 42 starts rotating, the counter is reset in step # 92, and the pulse monitoring is terminated in steps # 94 and # 96 (step of FIG. 10). Until the execution of # 60), the number of pulses of the pulse signal of the pulse encoder is counted. In step # 98, the counted number of pulses is stored in the memory.
[0067]
Next, the detailed flow of the pulse calculation in step # 62 in FIG. 10 will be described with reference to FIG. The drive pulse signal is corrected every time the series of operations in FIG. 10 is executed n times. Specifically, in step # 70, the operation counter N is incremented, and in step # 72, it is determined whether or not the operation counter N is equal to n. If the operation counter N is not equal to n, the operation is terminated. If the operation counter N is equal to n, the operation counter N is reset in step # 74, and the average value X ′ of the number of pulses of the pulse signal from the pulse encoder is calculated in step # 76. That is, X ′ is obtained by dividing the total number of pulses of the pulse signal from the pulse encoder by n. In step # 78, it is determined whether X ′ is equal to the theoretical value A. If X ′ is equal to the theoretical value A, the operation is terminated without correction. If X ′ is not equal to the theoretical value A, in steps # 80 to 84, the error | X′−A between the theoretical value A of the pulse number of the pulse signal of the pulse encoder and the average value X ′ of the actually detected pulse number. Based on |, the predetermined value X of the driving pulse signal is corrected, and the predetermined value X is used from the next time.
[0068]
That is, when the average value X ′ is larger than the theoretical value A, the stepping motor 42 is overrun by the amount corresponding to (X′−A) in the number of pulses from the pulse encoder. Therefore, the predetermined value X of the drive pulse signal is made smaller than the theoretical value A × B, and X = {A− (X′−A)} × B. Here, B is the ratio between the number of pulses of the drive pulse signal and the number of pulses of the pulse signal from the pulse echoer. That is, one pulse is output from the pulse echoer for B pulses of the drive pulse signal.
[0069]
On the other hand, when the average value X ′ is smaller than the theoretical value A, the stepping motor 42 is insufficiently rotated by an amount corresponding to (X′−A) in the number of pulses of the pulse encoder, so step # 84. , The predetermined value X of the drive pulse signal is made larger than the theoretical value A × B, and X = {A + (A−X ′)} × B.
[0070]
Next, another correction operation when the stepping motor 42 has stepped out will be described with reference to the timing chart of FIG.
[0071]
As shown in FIG. 13 (I), when the output of the pulse signal from the pulse encoder does not change despite the drive pulse signal being given, the frequency of the drive pulse signal is shown in FIG. 13 (II). In other words, the stepping motor 42 is rotated at a low speed by increasing the interval between the pulses. As a result, the torque of the stepping motor is increased to eliminate the step-out caused by the torque shortage. At this time, since the moving speed of the guide plates 22 and 32 is low, the operation timing and the printing speed of the guide plates 22 and 32 are adjusted as appropriate.
[0072]
As described above, the paper receiving apparatus 10 can stack the sheets on the paper receiving tray with the sheets more neatly arranged.
[0073]
In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. For example, the height of the paper loaded on the paper receiving tray 12 may be detected, and the guide plates 22 and 32 may be driven in response to the paper landing timing more accurately. Further, instead of driving the guide plates 22 and 32 each time a sheet is discharged from the printing machine 1, it may be driven intermittently every time several sheets are discharged.
[Brief description of the drawings]
FIG. 1 is a front view of a paper receiving apparatus and a printing machine according to an embodiment of the present invention.
FIG. 2 is a perspective view of the paper receiving apparatus of FIG.
FIG. 3 is a perspective view of the paper receiving device of FIG. 1;
4 is a cross-sectional view of the paper receiving device of FIG. 1. FIG.
FIG. 5 is a timing chart of the operation of the guide plate of the paper receiving apparatus of FIG.
FIG. 6 is a timing chart of the operation of the guide plate according to another embodiment.
7 is an overall flowchart of the operation of the paper receiving apparatus in FIG. 1. FIG.
FIG. 8 is a detailed flowchart of step # 14 in FIG.
FIG. 9 is a timing chart of pulse output of the paper receiving apparatus of FIG. 1; (I) indicates an initialization operation, (II) indicates a normal operation, and (III) and (IV) indicate an abnormal operation.
FIG. 10 is an overall flowchart of guide plate driving.
FIG. 11 is a detailed flowchart of step # 62 in FIG.
FIG. 12 is a flowchart of pulse encoder monitoring.
FIG. 13 is a timing chart of pulse output of the paper receiving device. (I) is a flowchart for monitoring the pulse encoder (II) during abnormal operation, (II) during correction driving.
[Explanation of symbols]
1 Rotary stencil printing press
2a, 2b, 2c
4 Plate cylinder
5a Plate making part
5b Removal part
6 Press roller
7 Output belt
8 Paper discharge sensor
9 Output section
10 Paper receiving device
12 Paper cradle
13 Top surface
14 groove
18 Paper presence sensor
20 Parallel guide rail
22 Stop guide plate
26 Stop guide plate support member
27 Lower part
28 Shading plate
29 Shading sensor
30 Parallel guide rail
32 width guide plate
34 Protrusion
36 width guide plate support member
38 Shading plate
39 Shading sensor
40 Drive belt (stop guide plate drive means, width guide plate drive means)
42 Stepping motor (stop guide plate driving means, width guide plate driving means)
44 pulley (stop guide plate driving means, width guide plate driving means)
46 Pulse plate (pulse encoder)
48 Photointerrupter (pulse encoder)
50 Operation panel
52, 54, 56, 58 switches (fine adjustment means, guide plate arbitrary setting means)
90 Output direction

Claims (5)

  A paper tray (adjacent to the paper discharge section (9) of the printing press main body from which the printed sheets are sequentially discharged and extending substantially along the paper discharge direction (90) below the paper discharge section (9). 12), a stop guide plate (22) that faces the paper discharge section (9) and extends in a direction substantially perpendicular to the paper discharge direction (90) above the paper tray (12), and the paper receiver Above the table (12) and between the paper discharge section (9) and the stop guide plate (22), the paper discharge direction (90) is approximately equal to the width of the paper discharged from the paper discharge section (9). ) Between the stop guide plate (22) and the pair of width guide plates (32) on the paper tray (12). In the paper receiving device (10) of the rotary stencil printing machine (1) in which the printed sheets are stacked, the above The stop guide is located between a position where the guide plate (22) approaches or comes into contact with the front end of the sheets stacked on the paper receiving tray (12) and a retracted position away from the position in the paper discharge direction (90). Stop guide plate driving means (40, 42, 44) for reciprocating the plate (22) in the paper discharge direction (90) is provided, and the stop guide plate drive means (40, 42, 44) includes the paper discharge section (9). ) While the paper ejected from the paper is dropped until it reaches the paper tray (12), the stop guide plate (22) is retracted in the paper discharge direction (90), and the stop guide plate (22) is moving backward. The paper receiving device of the rotary stencil printing machine is characterized in that the leading edge of the paper discharged from the paper discharge unit (9) is in contact with the paper stencil. The stop guide plate driving means (40, 42, 44 ) reduces the amplitude of reciprocating the stop guide plate (22 ) when the discharge speed of the paper discharged from the printing machine main body increases. 2. A paper receiving device for a rotary stencil printing press according to claim 1 . The paper catcher of a rotary stencil printing press according to claim 1 or 2 , wherein the stop guide plate driving means (40, 42, 44 ) operates each time a plurality of papers are discharged from the printing press main body. apparatus. The stop guide plate driving means (40, 42, 44 ) supplies a drive pulse signal to the stepping motor (42) for driving the stop guide plate (22 ) and the stepping motor (42), and the stepping motor (42 ) And a pulse encoder (46, 46) that is coupled to the stepping motor (42) to rotate and outputs a pulse signal having a frequency lower than that of the drive pulse signal in response to the drive pulse signal. 48) and the rotation at which the stepping motor (42) is to be operated by the drive pulse signal given to the stepping motor (42) by the rotation control means and the pulse signal from the pulse encoder (46, 48). Amount of rotation error between the amount of rotation and the amount of rotation of the stepping motor (42) actually operated An abnormality detecting means for detecting an abnormal operation of the stepping motor (42) when the rotation error amount exceeds a predetermined amount, and an abnormality detecting means for detecting an abnormal operation of the stepping motor (42). And a rotation correction means for correcting the drive pulse signal given to the stepping motor (42) by the rotation control means using the rotation error amount obtained by the abnormality detection means. Item 3. A paper receiving device for a rotary stencil printing machine according to item 1 or 2 . The abnormality detection means does not output the pulse signal of the pulse encoder (46, 48) even though the rotation control means gives the drive pulse signal of a predetermined number of pulses or more to the stepping motor (42). A step-out detecting means for detecting step-out of the stepping motor (42), and the rotation correcting means is configured to detect the step-out of the stepping motor (42) when the step-out detecting means detects the step-out of the stepping motor (42). 5. A paper receiving apparatus for a rotary stencil printing press as claimed in claim 4 , wherein said rotation control means includes low speed correction means for lowering the frequency of said drive pulse signal applied to said stepping motor (42).

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