JP2016069159A - Device for ejecting and stacking of punched sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device that can stack punched sheets in an aligned state and has a simple structure at low cost.SOLUTION: A device includes: a sheet loading shelf 4; a sheet alignment plate 5 opposed to a front surface of a sheet laminate S on the sheet loading shelf and vertically extending to the sheet loading shelf; and an endless belt 11 bridged between a pair of rollers 9, 10 and having a large number of vents extending between an outlet upper part of a punching machine 24 and the sheet alignment plate. A suction box 18 is disposed between the pair of rollers. A pressure adjustment unit is provided which adjusts a pressure in the suction box. A change of a rotational speed of the endless belt and a switching of pressure in the suction box are performed by a predetermined timing. The sheet is transported from the punching machine to the front of the sheet alignment plate while the upper surface of the sheet is sucked by the endless belt, and then the endless belt slows down or stops. Also, the suction is released, and the sheet is brought into abutment with the sheet alignment plate and falls on the sheet loading shelf.SELECTED DRAWING: Figure 1

Description

The present invention relates to an apparatus that is disposed at a subsequent stage of a punching machine such as a Thomson punching machine or a rotary punching machine, and discharges and stacks sheets punched by the punching machine from the punching machine.
Here, “cutting” does not mean that the product part is completely punched out of the paper, but that the product part and the surrounding punched-out part are partly connected so as not to be separated. Say. The same applies below.

  Conventionally, when punching is performed using a punching machine that processes sheets one by one, the sheet is first punched by a punching machine, and a certain number of the punched sheets are accumulated. As a result, a sheet stack is formed. Next, the sheet stack is sent to a separation device, and the product of each sheet of the sheet stack and the surrounding punched-out portion are separated at a time by the separation device.

For this reason, an apparatus for discharging and accumulating the sheets punched by the punching machine from the punching machine is arranged at the subsequent stage of the punching machine.
As this type of apparatus, for example, there is one described in Patent Document 1. This apparatus has a belt conveyor for carrying out punched paper from the punching machine, and a paper tray (not shown) disposed below the downstream end of the belt conveyor.

  Then, after the paper processed by the punching machine is transported on the belt conveyor, it falls on the inner bottom surface of the paper tray and collides with the inner surface of the side wall facing the belt conveyor outlet of the paper tray at its front end. In this way, the sheets are stacked one by one in the sheet tray with their front ends aligned.

However, in this conventional apparatus, the belt conveyor continuously rotates at a constant high speed in order to increase the production efficiency, so that the paper discharged from the belt conveyor collides with the inner surface of the side wall of the paper tray with a considerable momentum. To do. For this reason, the paper may bounce off the inner surface of the side wall of the paper tray, and the paper may be stacked without being aligned.
Furthermore, if a strong impact force is applied to the paper when the paper collides with the inner surface of the side wall of the paper tray, there is a possibility that the product part and the extracted waste part in the paper will be separated from each other. Therefore, it is necessary to reinforce the connection by increasing the number and the area per connection.

Then, if uneven paper stacks are formed and the connection in the paper is reinforced, there is a problem that the separation work by the subsequent separation device is hindered.
In addition, in this configuration, if the transport speed by the belt conveyor is increased in the case of a thin sheet, the next sheet falls and the sheets interfere with each other before the previous sheet lands on the sheet tray. May not be accumulated in a state of complete alignment.

  In the prior art, an apparatus including a chain gripper conveyance unit (see, for example, Patent Document 2) used in a printing apparatus is known instead of a belt conveyor. In this apparatus, the gripper moving path of the chain gripper conveyance unit extends between the upper part of the punching machine outlet and the upper part of the paper tray.

  The paper processed by the punching machine is conveyed to the paper tray with its front end held by the gripper. When the paper reaches a predetermined position on the paper tray, gripping of the gripper is released, the paper falls on the inner bottom surface of the paper tray, and the front edge of the paper collides with the inner surface of the side wall of the paper tray. In this way, the sheets are stacked one by one in the sheet tray with their front ends aligned.

  However, this apparatus also has the same problem as that of the above-mentioned apparatus. In addition, there is a problem that the structure of the apparatus becomes complicated and large, and the manufacturing cost increases.

Japanese Patent No. 5437515 JP 2003-54828 A

Therefore, an object of the present invention is to provide an apparatus having a simple and low-cost structure capable of collecting punched sheets in a uniform state.
Another object of the present invention is to separate the product and the waste residue from each other when discharging and stacking the paper from the punching machine even if there is only a small portion connecting the product in the paper and the surrounding waste residue. It is to provide an apparatus that does not have any problems.

In order to solve the above-described problems, according to the present invention, a punching station and a punching unit disposed in the punching station are provided at a subsequent stage of a punching machine to which sheets to be processed are supplied one by one. An apparatus for discharging and accumulating sheets punched by the unit from the punching station, and stacking the sheets received from the transport unit one by one, sequentially transporting the sheets from the punching station A stacking unit that forms a sheet stack, the stacking unit being supported by the frame, a sheet stacking shelf on which the sheet is stacked, and a sheet stacking unit attached to the frame. A sheet aligning plate facing the front of the body and extending perpendicularly to the sheet stacking shelf, and the transport unit is supported by the frame. A first horizontal roller disposed above the exit side of the punching station of the punching machine and extending perpendicularly to the paper discharge direction and parallel to the paper aligning plate; and the paper supported by the frame. A horizontal second roller disposed adjacent to the aligning plate and extending parallel to the first roller, and spanned between the first and second rollers. An endless belt formed, a drive unit attached to the frame and rotationally driving at least one of the first and second rollers, and a suction supported by the frame and extending between the first and second rollers And a lower surface of the suction box is opposed to a lower straight portion of the endless belt, and an intake port is formed on the lower surface. A pressure adjustment unit that is connected to the suction box and adjusts the pressure in the suction box; and a control unit that controls the drive unit and the pressure adjustment unit, and changes the rotational speed of the endless belt, and By switching the pressure in the suction box at a predetermined timing, the sheet is conveyed from the punching station to the front of the sheet aligning plate while being adsorbed on the upper surface thereof by the endless belt. An apparatus is provided in which the belt is decelerated or stopped, the suction is released, and the paper abuts on the paper alignment plate and falls onto the paper stacking shelf.
Here, “cutting” does not mean that the product part is completely punched out of the paper, but that the product part and the surrounding punched-out part are partly connected so as not to be separated. Say.

According to a preferred embodiment of the present invention, the timing of changing the rotational speed of the endless belt and switching the pressure in the suction box is variable.
According to another preferred embodiment of the present invention, the pressure adjusting unit includes a suction pump attached to the frame, and an intake pipe connecting the suction pump and the suction box, By operation, the pressure in the suction box becomes negative, and the paper is sucked. On the other hand, when the suction pump is stopped, the pressure in the suction box becomes atmospheric pressure and the suction is released.

According to still another preferred embodiment of the present invention, the pressure adjusting unit includes a blower attached to the frame, a first port connected to a suction port of the blower by a first vent pipe, and a second port. A second port connected to the suction box by a vent pipe, a third port connected to the blower outlet of the blower by a third vent pipe, and a fourth port opened to the atmosphere, At the same time as connecting the first and second ports, a negative pressure generating position connecting the third and fourth ports, and simultaneously connecting the first and fourth ports, the second and third ports A flow path switching valve that can take a positive pressure generation position for connecting a port, and when the flow path switching valve takes the negative pressure generation position, the pressure in the suction box becomes negative pressure and The paper is sucked Meanwhile, when the flow path switching valve takes the positive pressure generating position, the pressure in the suction box the suction becomes positive pressure is released.
According to still another preferred embodiment of the present invention, a partition plate for adjusting an opening area of the third port is provided at an inlet of the third port of the flow path switching valve.

According to still another preferred embodiment of the present invention, a pair of firsts for aligning both side surfaces of the sheet stack at positions facing both side surfaces of the sheet stack in the sheet stacking shelf of the stacking unit. Is provided.
According to still another preferred embodiment of the present invention, the front and rear surfaces of the sheet stack are cooperated with the sheet aligning plate at positions facing the rear surface of the sheet stack in the sheet stacking shelf of the stacking unit. A second butting mechanism for aligning the two is provided.

  According to still another preferred embodiment of the present invention, the sheet stacking shelf of the stacking unit is movable up and down, and the stacking unit is further attached to the frame and lifts and lowers the sheet stacking shelf. And a height detection sensor for detecting the height of the paper stack on the paper stacking shelf, and the height of the paper stack is increased by a certain amount based on a detection signal from the height detection sensor. Each time, the paper stacking shelf is lowered by an amount corresponding to the amount.

According to still another preferred embodiment of the present invention, a sensor for detecting the passage of the front end of the paper is disposed between the outlet of the punching unit and the inlet of the transport unit, and based on the detection signal of the sensor. The timing of changing the rotation speed of the endless belt and switching the pressure in the suction box is determined.
According to still another preferred embodiment of the present invention, the sheet stacking shelf and the endless belt are arranged so as to be inclined so that the sheet aligning plate side is lower than the punching station side of the punching machine.

  According to the present invention, after the paper punched by the punching machine is sucked by the endless belt having a large number of ventilation holes and conveyed to the front of the paper aligning plate, the endless belt is decelerated or stopped and the paper is sucked. Is released, and the front edge of the paper is brought into contact with the paper alignment plate and dropped onto the paper stacking shelf.

As a result, there is no variation in the falling position of the paper, and the paper does not bounce after colliding with the paper aligning plate, so that the paper can be stacked in a state of being exactly aligned.
Furthermore, the impact force exerted on the paper when the paper comes into contact with the paper alignment plate is reduced, and as a result, the number of connections between the product in the paper and the punched waste and the area per connection are minimized. Therefore, the separation process of the subsequent product and punched residue can be performed smoothly.

In addition, the adsorption and release of the paper can be performed not only by switching the pressure in the suction box between negative pressure and atmospheric pressure, but also by switching between negative pressure and positive pressure. By releasing air downward from the air intake of the suction box when paper is released, even thin paper can be quickly landed at a predetermined position on the paper stacking shelf. Interference with each other is prevented.
Furthermore, the apparatus configuration is simplified, the apparatus is made compact, and the manufacturing cost is kept low.

1 is a side cross-sectional view illustrating a schematic configuration of a paper ejection and stacking device according to an embodiment of the present invention. It is sectional drawing which shows the internal structure of the flow-path switching valve of the apparatus of FIG. FIG. 2 is a view similar to FIG. 1 showing a schematic configuration of a punched paper discharge and stacking device according to another embodiment of the present invention. It is a graph which shows the timing of operation | movement of each structural unit in 1 operation mode of the apparatus shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side sectional view showing a schematic configuration of a paper ejection and stacking apparatus according to one embodiment of the present invention.
Referring to FIG. 1, the apparatus of the present invention is disposed in a subsequent stage of a punching machine 24 that punches out a sheet supplied one by one.
Here, “cutting” does not mean that the product part is completely punched out of the paper, but that the product part and the surrounding punched-out part are partly connected so as not to be separated. Say. The same applies below.

In this embodiment, the punching machine 24 is a rotary punching machine, and includes a punching station 25 and a punching unit 26 (a pair of a magnet roller 27 and an anvil roller 28 to which a blade die is attached) disposed in the punching station 25. And a pair of conveying rollers 29) disposed on the upstream side thereof.
In FIG. 1, reference numeral 31 denotes a paper feeding device that supplies paper one by one to the punching machine 24, and 30 denotes a sensor that detects passage of the front end of the paper. Based on the detection signal of the sensor 30, the timing of the paper feeding operation by the paper feeding device 31 and the punching operation by the punching machine 24 is taken.
In this embodiment, the apparatus of the present invention is applied to a rotary punching machine. However, the apparatus of the present invention can be applied to an arbitrary punching machine of a type for punching a sheet supplied one by one.

  The apparatus of the present invention includes a transport unit 1 that sequentially unloads sheets punched by the punching unit 26 from the punching station 25, and a stacking unit that stacks the sheets received from the transport unit 1 one by one to form a sheet stack S. 2 is provided.

  The stacking unit 2 is supported by the frame 3, the horizontal sheet stacking shelf 4 supported on the frame 3, and the sheet stacking unit 4 mounted on the frame 3. The stacking unit 2 is attached to the frame 3 and faces the front surface of the sheet stack S and stacks sheets. A sheet aligning plate 5 extending perpendicularly to the shelf 4 is provided.

  In this embodiment, the sheet stacking shelf 4 is supported so as to be movable up and down with respect to the frame 3 via a guide (not shown) fixed to the frame 3. In addition, a pair of shafts 6 (upper shaft is not shown) are vertically spaced apart from each other in a plane that crosses one side of the paper stacking shelf 4 in the vertical direction and extends vertically to the paper stacking shelf 4. 3 is attached so as to be rotatable around its axis, and extends in the paper carry-out direction.

  Pulleys (not shown) are attached to both ends of the pair of shafts 6, and first endless belts 8 are stretched between pulleys that are vertically opposed to each other. Further, the sheet stacking shelf 4 is fixed to the first endless belt 8. Then, when one of the pair of shafts 6 is rotated forward and backward by a drive unit (not shown), the pair of first endless belts 8 is rotated clockwise and counterclockwise, and accordingly, the paper stacking is performed. The shelf 4 moves up and down.

The stacking unit 2 also includes a height detection sensor 7 that detects the height of the sheet stack S on the sheet stacking shelf 4. Each time the height of the sheet stack S increases by a certain amount based on the detection signal of the height detection sensor 7, the sheet stacking shelf 4 is lowered by an amount corresponding thereto. In this embodiment, the height detection sensor 7 is disposed behind the sheet aligning plate 5, and an opening is provided in a region located within the detection area of the height detecting sensor 7 on the sheet aligning plate 5.
The mechanism for raising and lowering the paper stacking shelf 4 is not limited to this embodiment, and any known known raising and lowering mechanism can be applied. Further, the paper stacking shelf 4 may be supported at a predetermined position of the frame 3 in a stationary state.

  The stacking unit 2 further includes a pair of first butting mechanisms 21 for aligning both side surfaces of the sheet stack S provided at positions facing both side surfaces of the sheet stack S in the sheet stacking shelf 4; A second butting mechanism 22 for aligning the front and rear surfaces of the sheet stack S in cooperation with the sheet aligning plate 5 provided at a position facing the rear surface of the sheet stack S in the sheet stacking shelf 4 is provided. ing.

  The pair of first alignment mechanisms 21 includes a pressing plate 21a extending perpendicularly to the sheet stacking shelf 4 and the sheet alignment plate 5, and an actuator for reciprocating linear movement of the pressing plate 21a in a direction perpendicular to the sheet carry-out direction. (Not shown). The pair of first alignment mechanisms 21 includes an open position where the pair of pressing plates 21a are separated from the side surfaces of the sheet stack S, and an alignment position where the pair of pressing plates 21a are in contact with the side surfaces of the sheet stack S. Is supposed to take.

The second alignment mechanism 22 includes a pressing plate 22a extending parallel to the sheet alignment plate 5 and an actuator (not shown) for reciprocating linear movement of the pressing plate 22a in the sheet unloading direction. The second alignment mechanism 22 then presses the rear surface of the sheet stack S with the pressing plate 22a and the open position where the press plate 22a is separated from the rear surface of the sheet stack S, and aligns the front surface of the sheet stack S with the sheet. A butting position to be brought into contact with the plate 5 is taken.
The first and second butt alignment mechanisms 21 and 22 are provided as necessary in consideration of ease of sheet alignment and the like.

The transport unit 1 is supported by the frame 3 and is disposed above the exit side of the punching station 25 of the punching machine 24, and is a horizontal first roller 9 extending perpendicularly to the paper discharge direction and parallel to the paper aligning plate 5. And a horizontal second roller 10 supported by the frame 3 and disposed adjacent to the sheet aligning plate 5 and extending in parallel with the first roller 9, and between the first and second rollers 9, 10. It has a second endless belt 11 which is handed over and formed with air holes distributed over the entire surface.
In this embodiment, the second endless belt 11 extends horizontally in parallel with the paper stacking shelf 4.

A first pulley 13 is fixed to the rotation shaft of the second roller 10, and a motor 14 is attached to the frame 3 below the second roller 10. A second pulley 15 is fixed to the drive shaft of the motor 14, and a timing belt 16 is stretched between the second and third pulleys 13 and 15. The second roller 10 is rotationally driven by the motor 14 so that the endless belt 11 is always rotated clockwise in FIG.
The motor 14 is controlled by the control unit 17.

  In this embodiment, the first pulley 13, the motor 14, the second pulley 15, and the timing belt 16 constitute a drive unit that rotationally drives the second roller 10. The drive unit is configured in this embodiment. The drive unit is not limited to the above, and any drive unit may be used as long as at least one of the first and second rollers 9 and 10 is rotationally driven.

  The transport unit 1 also includes a suction box 18 supported by the frame 3 and extending between the first and second rollers 9 and 10. The lower surface of the suction box 18 is opposed to the lower straight portion of the second endless belt 11 and includes an intake port (not shown).

  The suction box 18 is connected to a blower (not shown) via a flow path switching valve 19 (see FIG. 2). In this case, as shown in FIG. 2, the first port 19a of the flow path switching valve 19 and the suction port of the blower are connected by a first vent pipe (not shown), and the second port 19b and the suction box 18 are connected. Are connected by a second vent pipe (not shown), the third port 19c and the blower outlet are connected by a third vent pipe (not shown), and the fourth port 19d is opened to the atmosphere. ing.

  Thus, the flow path switching valve 19 is connected to the first and second ports 19a and 19b and simultaneously to the negative pressure generation position (see FIG. 2 (A)) that connects the third and fourth ports 19c and 19d. At the same time as connecting the first and fourth ports 19a and 19d, the positive pressure generation position (see FIG. 2B) connecting the second and third ports 19b and 19c can be taken. .

As shown in FIG. 2, a partition plate 19 e that adjusts the opening area of the third port 19 c is provided at the inlet of the third port 19 c of the flow path switching valve 19.
The flow path switching valve 19 is controlled by the control unit 17.

The blower, the flow path switching valve 19 and the first to third vent pipes constitute a pressure adjustment unit that adjusts the pressure in the suction box 18.
In this case, when the third port 19c of the flow path switching valve 19 is open, the flow path switching valve 19 is switched between the negative pressure generation position and the positive pressure generation position, thereby The pressure is switched between negative pressure and positive pressure. When the third port 19c is closed by the partition plate 19e, the flow path switching valve 19 is switched between the negative pressure generation position and the positive pressure generation position, so that the pressure in the suction box 18 is negative. Switching between pressure and atmospheric pressure.

  Then, while the second endless belt 11 rotates, the pressure in the suction box 18 becomes negative, so that the upper surface of the sheet is adsorbed by the second endless belt 11 and is removed from the stacking unit 24. When the pressure in the suction box 18 becomes positive or atmospheric pressure, the second endless belt 11 is released from adsorbing the paper.

The configuration of the pressure adjustment unit is not limited to this embodiment.
For example, the pressure adjustment unit has a suction pump attached to the frame 3 and an intake pipe connecting the suction pump and the suction box 18, and the suction box 18 becomes negative due to the operation of the suction pump. A configuration in which the pressure in the suction box 18 becomes atmospheric pressure by stopping the operation of the pump may be employed.

  Further, a sensor 23 for detecting the passage of the front end of the paper is disposed between the punching unit 26 of the punching machine 24 and the entrance of the transport unit 1. The detection signal of the sensor 23 is sent to the control unit 17.

Based on the detection signal of the sensor 23, the rotation speed of the second endless belt 11 is changed and the pressure in the suction box 18 is switched at a predetermined timing, so that the punching station 25 of the punching machine 24 Then, the punched paper is conveyed to the front of the paper aligning plate 5 while the upper surface of the paper is sucked by the second endless belt 11, and then the second endless belt 11 is decelerated or stopped and the suction of the paper is released. Then, the sheet comes into contact with the sheet aligning plate 5 and falls onto the sheet stacking shelf 4.
Further, according to this timing, the first and second butt aligning mechanisms are operated, whereby the sheets punched by the punching machine 24 are stacked one by one on the sheet stacking shelf 4 in a state of being exactly aligned. The

  In this case, when the timing is variable, and when the pressure in the suction box 18 is switched between a negative pressure and a positive pressure, the suction port of the suction box 18 is released when the suction of the sheet is released. Needless to say, air is released downward from the air.

  In this embodiment, the sensor 23 is arranged at a predetermined position, and the rotation speed of the second endless belt 11 is changed and the pressure in the suction box 18 is changed based on the time when the front end of the sheet passes the sensor 23. Although the switching timing is determined, the means that can be used to determine the timing are not limited to sensors. In place of the sensor 23, for example, a rotary encoder may be arranged on the rotating shaft of the drive system of the first endless belt 11, and the timing may be determined based on the count number of pulse signals output from the rotary encoder. .

FIG. 3 is a view similar to FIG. 1 showing a schematic configuration of a paper ejection and stacking apparatus according to another embodiment of the present invention.
In this embodiment, the sheet stacking shelf 4 and the second endless belt 11 are inclined so that the sheet aligning plate 5 side is lower than the punching station 25 side of the punching machine 24 in the embodiment of FIG. . According to this configuration, the front and rear surfaces of the sheet stack S can be reliably aligned only by the sheet aligning plate 5, and the second butting mechanism 22 is not necessary.
In this embodiment, the sheet aligning plate 5 extends downward from the case of the embodiment of FIG. 1 and extends through an opening provided in the sheet stacking shelf 2.

Next, an example of the operation mode of the apparatus shown in FIG. 3 will be described.
FIG. 4 is a graph for explaining the operation timing of each component unit in one operation mode of the apparatus shown in FIG.
With reference to FIG. 4, when the paper processed by the punching unit 26 of the punching machine 24 reaches the exit of the punching station 25, the front end of the paper is detected by the sensor 23, and a detection signal is output from the sensor 23 ( (Position (I) in FIG. 4). Based on this detection signal, the flow path switching valve 19 is operated, and the pressure in the suction box 18 of the transport unit 1 is made negative.

Accordingly, the sheet is conveyed at a high speed toward the stacking unit 2 while the upper surface of the sheet is adsorbed by the second endless belt 11. When the sheet is conveyed to the front of the sheet aligning plate 5 (position (II) in FIG. 4), the second endless belt 11 is decelerated. The deceleration start of the second endless belt 11 is after the elapse of time t from the output of the detection signal from the sensor 23, and this time t is
t = (distance from sensor 23 to sheet aligning plate 5)
÷ (Rotation (conveyance) speed of the second endless belt 11)
Determined by. The time t can be finely adjusted.

When the second endless belt 11 is decelerated to a predetermined speed (position (III) in FIG. 4), the flow path switching valve 19 is operated, and the pressure in the suction box 18 is positive or atmospheric pressure. The suction of the paper is released. As a result, the sheet falls away from the second endless belt 11 and abuts on the sheet aligning plate 5 at the front end thereof and lands on the sheet stacking shelf. At that time, the pair of first alignment mechanisms 21 arranged on both sides of the sheet stack S move from the open position to the alignment position and perform an alignment operation (position (IV) in FIG. 4).
In this way, the punched sheets are stacked one by one on the sheet stacking shelf 2 in a perfectly aligned state.

  As described above, in the apparatus of the present invention, after the paper punched by the punching machine 24 is conveyed to the front of the paper aligning plate 5 while being sucked by the second endless belt 11, the second endless belt is used. 11 is decelerated or stopped, the suction of the paper is released, and the front edge of the paper is brought into contact with the paper aligning plate 5 so as to drop onto the paper stacking shelf 2, so that there is no variation in the paper drop position. Then, the paper is prevented from bouncing off after colliding with the paper aligning plate 5, whereby the paper is stacked in a state of being perfectly aligned.

  In addition, since the impact force when the paper comes into contact with the paper aligning plate 5 is reduced, the number of the connection between the product in the paper and the punched residue and the area per connection can be minimized. Therefore, the separation process of the latter-stage product and the extracted residue can be performed smoothly.

Further, when the suction and release of the paper is performed by switching the pressure in the suction box 18 between the negative pressure and the positive pressure, air is released downward from the suction port of the suction box when the suction of the paper is released. Even a thin sheet can be quickly landed at a predetermined position on the sheet stacking shelf, thereby preventing the sheets from interfering with each other before landing.
Furthermore, the apparatus configuration is simplified, the apparatus is made compact, and the manufacturing cost is suppressed.

DESCRIPTION OF SYMBOLS 1 Conveyance part 2 Accumulation part 3 Frame 4 Paper stacking shelf 5 Paper alignment board 6 Shaft 7 Height detection sensor 8 1st endless belt 9 1st roller 10 2nd roller 11 2nd endless belt 12 Drive unit 13 1st 1 pulley 14 motor 15 second pulley 16 timing belt 17 control unit 18 suction box 19 flow path switching valve 19a first port 19b second port 19c third port 19d fourth port 20 partition plate 21 first Butt aligning mechanism 21a holding plate 22 second aligning mechanism 22a holding plate 23 sensor 24 punching machine 25 punching station 26 punching unit 27 magnet roller 28 anvil roller 29 transport roller pair 30 sensor 31 paper feeding unit S paper stack

Claims (10)

A punching station and a punching unit disposed in the punching station are provided at a subsequent stage of a punching machine to which sheets to be processed are supplied one by one, and the paper punched by the punching unit is discharged from the punching station. And a device for accumulating,
A transport unit that sequentially carries out the paper from the punching station; and a stacking unit that stacks the paper received from the transport unit one by one to form a paper stack.
The stacking unit
Frame,
A paper stacking shelf supported by the frame and on which the paper is stacked;
A sheet aligning plate attached to the frame and facing the front surface of the sheet stack and extending perpendicularly to the sheet stacking shelf,
The transport unit is
A first horizontal roller supported by the frame and disposed above the exit side of the punching station of the punching machine, extending perpendicular to the paper discharge direction and parallel to the paper alignment plate;
A second horizontal roller supported by the frame and disposed adjacent to the sheet aligning plate and extending parallel to the first roller;
An endless belt that is spanned between the first and second rollers and has air holes distributed over the entire surface thereof;
A drive unit attached to the frame and configured to rotationally drive at least one of the first and second rollers;
A suction box supported by the frame and extending between the first and second rollers, and a lower surface of the suction box is opposed to a lower straight portion of the endless belt, and an intake port is provided on the lower surface. Formed, and
A pressure adjusting unit connected to the suction box for adjusting the pressure in the suction box;
A control unit for controlling the drive unit and the pressure adjustment unit,
By changing the rotational speed of the endless belt and switching the pressure in the suction box at a predetermined timing, the paper is aligned from the punching station while the upper surface of the paper is adsorbed by the endless belt. The sheet is conveyed to the front of the plate, and then the endless belt is decelerated or stopped and the suction is released, and the sheet abuts on the sheet alignment plate and falls onto the sheet stacking shelf. Device to do.   The apparatus according to claim 1, wherein the timing of changing the rotation speed of the endless belt and switching the pressure in the suction box is variable. The pressure adjustment unit includes:
A suction pump attached to the frame;
An intake pipe connecting the suction pump and the suction box, and
By the operation of the suction pump, the pressure in the suction box becomes negative and the paper is sucked. On the other hand, when the suction pump is stopped, the pressure in the suction box becomes atmospheric pressure and the suction is released. The apparatus according to claim 1 or 2, characterized in that The pressure adjustment unit includes:
A blower attached to the frame;
A first port connected to the suction port of the blower by a first vent pipe, a second port connected to the suction box by a second vent pipe, and an outlet of the blower by a third vent pipe A negative pressure generation position having a third port connected and a fourth port opened to the atmosphere, and simultaneously connecting the first and second ports and connecting the third and fourth ports And a flow path switching valve that can take a positive pressure generation position that connects the second and third ports at the same time as connecting the first and fourth ports,
When the flow path switching valve takes the negative pressure generation position, the pressure in the suction box becomes negative pressure to attract the paper, while the flow path switching valve takes the positive pressure generation position The apparatus according to claim 1, wherein the suction is released by a positive pressure in the suction box.   The apparatus according to claim 4, wherein a partition plate for adjusting an opening area of the third port is provided at an inlet of the third port of the flow path switching valve.   A pair of first butt alignment mechanisms for aligning both side surfaces of the sheet stack are provided at positions facing both side surfaces of the sheet stack in the sheet stacking shelf of the stacking unit. An apparatus according to any one of claims 1 to 5.   A second butting mechanism for aligning the front and rear surfaces of the sheet stack in cooperation with the sheet aligning plate is provided at a position facing the rear surface of the sheet stack on the sheet stacking shelf of the stacking unit. The device according to claim 1, wherein the device is a device. The paper stacking shelf of the stacking unit can be moved up and down, and the stacking unit further includes:
An elevating unit attached to the frame and elevating and lowering the paper stacking shelf;
A height detection sensor for detecting the height of the paper stack on the paper stacking shelf, and each time the height of the paper stack increases by a certain amount based on a detection signal of the height detection sensor. 8. The apparatus according to claim 1, wherein the sheet stacking shelf is lowered by an amount corresponding thereto.   A sensor for detecting the passage of the front end of the sheet is disposed between the outlet of the punching unit and the inlet of the transport unit. Based on the detection signal of the sensor, the rotation speed of the endless belt is changed and the suction box 9. A device according to any preceding claim, wherein the timing of switching pressures within is determined.   10. The sheet stacking shelf and the endless belt are arranged so as to be inclined so that the sheet aligning plate side is lower than the punching station side of the punching machine. A device according to the above.

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