JPWO2006120913A1 - Sheet material accumulation method and sheet material accumulation apparatus - Google Patents

Abstract

Provided is a sheet material accumulating method and sheet material accumulating apparatus that can perform appropriate accumulation without causing defective products in the next process even when there is variation in the degree of overlap of sheet materials such as conveyed booklets. To do. A sheet material accumulating method for accumulating a sheet material W partially overlapped and continuously conveyed from above in a state where the sheet material is stood on a horizontal table 7 below, and a bundle of sheet materials accumulated on the table The back pressure F from the bundle of sheet materials applied to the holder 8 during the stacking process is detected in the holder 8 for preventing the tip side from collapsing, and the holder is moved in the stacking direction so that the back pressure is maintained at a predetermined level. Control.

Description

  The present invention relates to a method for accumulating sheet materials such as a printing book and a sheet material accumulating apparatus.

  A rectangular parallelepiped with its orientation aligned and its four corners upright, with the booklet printed on a rotary press and superimposed in a slightly shifted state and continuously conveyed from above Japanese Laid-open Patent Publication Nos. 2000-26859 and 2003-08-09 disclose a bookbinding apparatus that collects bundles of collected booklets and binds them together with a binding band (Patent Documents 1 and 2).

  The bookbinding apparatus for performing such operations prevents the stacking surface on which a bundle of the booklets accumulated in an upright state is placed, and the booklet newly transported and added to one end of the bundle from falling down. Supporting means for supporting, and a holder for preventing the bundle of the booklets from collapsing at the other end of the bundle of the booklets. The accumulation surface is, for example, a conveyance surface of a belt conveyor having a plurality of thin belts.

In Patent Document 2, a belt conveyor having a plurality of thin belts is installed at one end of a bundle of printed book bundles so that the transport surface moves from the upper side to the lower side. A bookbinding apparatus is disclosed in which a book is conveyed and a support device (auxiliary guide plate) is provided slightly behind the belt.
Patent Document 2 also discloses a holder (holding body) that moves away from the support device as the bundle of printing books accumulated on the conveyance surface increases.
JP 2000-118511 A Japanese Patent Laid-Open No. 10-35984

  By the way, in the bookbinding apparatus that continuously conveys the booklet from the upper side to the lower stacking surface, the degree of overlap between the front and the back of the booklet is usually constant. There may be variations in the overlap of the book. However, the holder that supports one end of the bundle of stacked booklets moves at a constant speed on the assumption that the bundle of booklets grows at a constant speed, so the degree of overlap of the conveyed booklets changes. When you do this, the growth rate of the bundle of brushes will change. Then, if the growth rate of the booklet bundle and the moving speed of the holder are not balanced, a part of the booklet jumps out of the bundle of the booklet that has been arranged and collected up to that point, or the inside of the booklet bundle. There was a problem that it was bent and pinched.

Such inconvenience deteriorates the appearance of the bundle of printing books, prevents the stable conveyance of the printing books, and causes defective products in the bookbinding process in the next process.
The present invention has been made in view of the above-mentioned problems, and even when there is variation in the degree of overlap of sheet materials such as conveyed booklets, appropriate integration that does not cause defective products in the next process is performed. An object of the present invention is to provide a sheet material accumulating method and sheet material accumulating apparatus that can be performed.

In order to achieve the above object, the present invention takes the following technical means.
That is, the sheet material accumulation method according to the present invention is a sheet material accumulation method in which a part of the sheet material is stacked and continuously conveyed from above while being stacked on a horizontal table below, The holder for detecting a back pressure from the bundle applied to the holder for preventing the collapse of the front end side of the bundle of the sheet material accumulated on the table and maintaining the back pressure at a predetermined magnitude. Controls the movement in the accumulation direction.
Such control is performed in a stacking process in which a bundle of sheet materials grows and in a retracting process in which the bundle of stacked booklets is retracted to bind.

  Preferably, the back pressure from the bundle is detected by detecting a load current to the electric motor for moving the holder, and the movement of the holder is controlled by controlling the current applied to the electric motor. .

  Another sheet material accumulation method according to the present invention is a sheet material accumulation method in which a part of the sheet material is accumulated in a state where the sheet material is continuously stacked and conveyed from above on a horizontal table below, In the process of retracting the bundle in order to newly accumulate the sheet material after the bundle of the sheet material reaches a certain size, the leading end side of the bundle to be retracted is supported by the first holder and the bundle The rear end side is supported by the second holder, and the back pressure from the bundle applied to the first holder and the back pressure from the bundle applied to the second holder are detected. The movement of the first holder and the second holder in the stacking direction is controlled so as to maintain the size.

  Preferably, each back pressure is detected by detecting a load current to each electric motor for retracting the first holder and the second holder, and for retracting the first holder and the second holder. The movement is controlled by controlling the current applied to each electric motor.

  The sheet material accumulating device according to the present invention is a sheet material accumulating device for accumulating a sheet material that is partially overlapped and continuously conveyed from above in a standing state on a horizontal table below. A holder for preventing the collapse of the front end side of the bundle of sheet materials accumulated on the top, back pressure detection means for detecting back pressure from the bundle applied to the holder, and accumulation of the sheet materials on the holder A holder moving means for moving in the direction, and a control means for controlling the operation of the holder moving means, the control means based on the back pressure detected by the back pressure detecting means. It is comprised so that the movement of the said holder by may be controlled.

  Preferably, the holder moving means has an electric motor, the back pressure detecting means has a load current detecting device for the electric motor, and the control means is based on the load current detected by the load current detecting device. It is comprised so that the movement of the said holder by the said electric motor may be controlled.

  More preferably, the electric motor is a servo motor, and the control means is configured to control an applied current to the servo motor based on a load current detected by the load current detecting device.

  Another sheet material accumulating device according to the present invention is a sheet material accumulating device for accumulating a sheet material that is partially overlapped and continuously conveyed from above on a horizontal table below, A first holder for preventing a collapse of a front end side of the bundle of sheet materials accumulated on the table; a second holder for supporting a rear end side of the bundle; and the first holder from the bundle A back pressure detecting means for detecting one or both of a back pressure applied to the second holder and a back pressure applied to the second holder, a first holder moving means for moving the first holder in the stacking direction of the sheet material, A second holder moving means for moving the second holder in the stacking direction of the sheet material; and a control means for controlling one or both of the operations of the first holder moving means and the second holder moving means. And the system The means controls one or both of the movements of the first holder and the second holder by the first holder moving means and the second holder moving means based on the back pressure detected by the back pressure detecting means. Consists of.

  Preferably, each of the first holder moving means and the second holder moving means has an electric motor, the back pressure detecting means has a load current detecting device of each electric motor, and the control means The movement of the first holder and the second holder by the electric motor is controlled based on each load current detected by the load current detection device.

  Note that the “front end side of a bundle of sheet materials” in the above refers to the side on which the first transported sheet materials in the stacking direction are stacked. In addition, “retract” and “retreat” are performed on the table to a position where a bundle of sheet materials stacked and having a predetermined size is not hindered from growing another bundle of sheet materials newly accumulated. It refers to moving and such movement.

  According to the present invention, a sheet material accumulating method and a sheet capable of performing appropriate accumulating without causing defective products in the next process even when there is variation in the overlapping state of sheet materials such as conveyed booklets. A material accumulating device can be provided.

FIG. 1 is a view showing an outline of a sheet material accumulating apparatus according to the present invention. FIG. 2 is an AA arrow view in FIG. FIG. 3 is a diagram illustrating a state in which the fixing tool is fixed to the drive belt. FIG. 4 is a diagram showing an outline of the transport unit. FIG. 5 is a diagram illustrating the operation of the stacking unit. FIG. 6 is a diagram illustrating the operation of the stacking unit. FIG. 7 shows the operation of the stacking unit. FIG. 8 shows the operation of the stacking unit. FIG. 9 is a diagram illustrating the operation of the stacking unit.

Explanation of symbols

1 Sheet material accumulating device 2 Back pressure detection means (fixing tool)
3 Back pressure detection means (drive belt)
6 Back pressure detection means, control means (torque control unit)
7 Table 8 Holder, 1st holder (1st holder part)
9 Holder moving means, 1st holder moving means (1st holder drive part)
10 Second holder (second holder part)
11 Second holder moving means (second holder driving unit)
23 Electric motor, servo motor (motor)
32 Electric motor
F, F 'Back pressure P Bundle of sheet materials (bundle of printing books)
W Sheet material (print book)

1 is a diagram showing an outline of a sheet material accumulating apparatus 1 according to the present invention, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. 3 is a diagram showing a state in which a fixture 2 is fixed to a drive belt 3. FIG. 4 is a diagram showing an outline of the transport unit 4.
1 and 2, the sheet material accumulating apparatus 1 includes an accumulating unit 5, a conveying unit 4, a torque control unit 6, and the like.

The stacking unit 5 includes a table 7, a first holder unit 8, a first holder driving unit 9, a second holder unit 10, a second holder driving unit 11, a fork unit 12, a fork driving unit 13, and the like.
The table 7 is a place where sheet materials such as the printing book W are collected as a bundle thereon, and is formed by two thin belts 14 and 14 of a belt conveyor.
Hereinafter, the left side in FIGS. 1 and 2 is referred to as a downstream or downstream side, and the right side is referred to as an upstream or upstream side. Also, the horizontal direction in FIG.

The first holder portion 8 includes a support portion 15, a pair of support arms 16, 16, holders 17, 17, sliders 18,.
The support portion 15 is formed by a frame having a rectangular outer shape, and is arranged orthogonal to the stacking direction, and a plurality of drive belts 3, 31, 39 described later penetrate through the inside of the frame. Yes. In the upper part on the upstream side of the support portion 15, the lower ends of the two support arms 16, 16 are spaced apart in the horizontal direction and the two belts 14, 14 are prevented from moving in the vertical direction. It is not installed in a position.

The support arm 16 has a crank shape, and an upper end extends upward on the upstream side, and a holder 17 is integrated with each upper end. The support arms 16, 16 have a sliding portion at the lower end that can slide in the vertical direction groove provided in the support portion 15 at the lower end, and serve as a slider of a rodless cylinder fixed to the support portion 15. Connected and move up and down at the same time.
The holder 17 is formed of a rectangular plate, and the end in the longitudinal direction is gradually thinner. The holder 17 is integrated with the support arm 16 at its lower end so that the end that is parallel and thin with the support portion 15 is on the upper side. Has been.

The sliders 18,..., 18 are integrated at the four corners of the support portion 15. Each of the sliders 18,..., 18 has a hole penetrating in the accumulation direction, and a guide bar 19,.
The guide bars 19,..., 19 are arranged in parallel in the stacking direction two by two in the upper and lower directions, and are fixed to the gantry, and guide the sliders 18,. .

  Referring to FIG. 3, the fixture 2 includes a toothed plate 20 and a backup plate 21. The toothed plate 20 is provided on one of its peripheral surfaces with teeth that can mesh with a tooth pattern of the drive belt 3 to be described later for reciprocating the first holder portion 8 in the stacking direction.

The backup plate 21 has a peripheral surface that can be joined to the surface on which the teeth of the toothed plate 20 are formed, and is fixed to the support portion 15. The backup plate 21 is integrated with the toothed plate 20 and the bolts 22,... 22 in a state where the drive belt 3 is sandwiched between the teeth of the toothed plate 20.
The first holder driving unit 9 includes a motor 23, a driving pulley 24, a driven pulley 25, and the driving belt 3.
The motor 23 is fixed to the mount of the stacking unit 5 on the downstream side of the first holder unit 8. A servo motor is used as the motor 23.

The drive pulley 24 is a timing pulley that is directly connected to the drive shaft of the motor 23.
The driven pulley 25 is disposed at the upstream end of the stacking unit 5 so that the rotation shaft is parallel to the drive shaft of the motor 23 in a horizontal plane including the drive shaft of the motor 23. The driven pulley 25 is a timing pulley that is rotatable around a rotation axis.
The driving belt 3 connects the driving pulley 24 and the driven pulley 25, and a timing belt is used. As described above, the drive belt 3 is sandwiched between the toothed plate 20 and the backup plate 21 of the fixture 2 and fixed integrally therewith. Therefore, when the drive belt 3 is driven by the rotation of the motor 23 (drive pulley 24), the first holder portion 8 in which the fixture 2 is integrated moves in the stacking direction. Further, the external force applied to the first holder portion 8 is transmitted to the drive pulley 24 via the drive belt 3.

The second holder portion 10 includes a support portion 26, a pair of support arms 27, 27, holders 28, 28, sliders 29,..., 29, a fixture 30, and the like.
The second holder part 10 is arranged on the upstream side of the first holder part 8.
Like the support portion 15 in the first holder portion 8, the support portion 26 is formed with a rectangular frame, and the support portion 26 is arranged orthogonal to the stacking direction, A plurality of drive belts 3, 31, 39 are passed therethrough. In the upper part on the upstream side of the support portion 26, the lower ends of the two support arms 27, 27 are spaced apart in the horizontal direction and the vertical movement is not hindered by the two belts 14, 14. It is attached.

The support arms 27 and 27 are straight columnar bodies, and their lower ends are attached to the support portion 26 so as to be movable up and down so that the longitudinal direction is in the vertical direction. A holder 28 is integrated near the upper end of each support arm 27. The support arms 27, 27 have a sliding part which can move in the vertical direction provided in the support part 26 and slides in a vertical groove at the lower end, and is attached to a rod of a fluid pressure cylinder fixed to the support part 26. Connected and move up and down at the same time.
The holder 28 is formed of a rectangular plate, and the end in the longitudinal direction is gradually thinned. The holder 28 is integrated with the support arm 27 at its lower end so that the end that is parallel and thin with the support portion 26 faces upward. ing.

The sliders 29,..., 29 are provided at the four corners of the support portion 26 and have holes therethrough, respectively. The guide bars 19 pass through the holes, and the sliders 29,. It is the same as the first holder part 8 that the second holder part 10 is stably guided to reciprocate in the stacking direction.
The configuration of the second holder driving unit 11 is substantially the same as the configuration of the first holder driving unit 9.
That is, the second holder driving unit 11 includes a motor 32, a driving pulley 33, a driven pulley 34, and a driving belt 31.
The motor 32 is disposed beside the motor 23 of the first holder driving unit 9 and is fixed to the gantry. A servo motor is used as the motor 32.

The drive pulley 33 is a timing pulley that is directly connected to the drive shaft of the motor 32.
The driven pulley 34 is disposed at the upstream end of the stacking unit 5 so that the rotation shaft is parallel to the drive shaft of the motor 32 in a horizontal plane including the drive shaft of the motor 32. The driven pulley 34 is a timing pulley that is rotatable around the rotation axis.
The driving belt 31 connects the driving pulley 33 and the slave pulley 34, and a timing belt is used. The drive belt 31 is sandwiched between the toothed plate and the backup plate of the fixture 30, and is fixed so as to be movable integrally therewith. Therefore, similarly to the first holder part 8, the second holder part 10 moves in the stacking direction by the rotation of the motor 32.

The fork portion 12 includes a support portion 35, sliders 36,..., 36, a pair of forks 37, 37, a fixture 38, and the like.
The fork portion 12 is disposed on the upstream side of the second holder portion 10.
The configurations of the support portion 35 and the sliders 36,..., 36 are the support portions 15 and 26 and the sliders 18,..., 18, 29,. The first holder portion 8 and the second holder portion 10 are configured such that the guide bar 19 penetrates through the holes of the sliders 36,..., 36 so that the fork portion 12 can move in the stacking direction. Is the same.

The forks 37 and 37 have a crank shape, and their lower ends are respectively attached to the upper part on the downstream side of the support portion at a distance in the horizontal direction. The forks 37 and 37 can move up and down between the two belts 14 and 14 at a position where movement in the stacking direction when they are raised is not hindered by the conveyance belt 45 and the inner belt 46 described later. It is arranged. Further, the forks 37 and 37 are both disposed slightly inside the holders 17 and 17 in plan view so as not to overlap the holders 17 and 17 of the first holder portion 8. Each of the forks 37, 37 is connected to a slider of a rodless cylinder fixed to the support portion 35, and is configured to be vertically movable simultaneously.
The fixing device 38 includes a backup plate and a toothed plate having teeth that can mesh with the tooth shape of the drive belt 39, and these are integrated by a bolt with the drive belt 39 interposed therebetween and fixed to the support portion 35. This is the same as the first holder portion 8 and the second holder.

In the fork drive unit 13, the motor 40 is disposed beside the motor 32 of the second holder drive unit 11 and is fixed to the gantry. The motor 40, the driving pulley 41, the driven pulley 42, and the driving belt 39 are substantially the same as those in the first holder driving unit 9 and the second holder driving unit 11. The drive belt 39 is movably fixed integrally with the fixing tool 38, and the fork portion 12 moves in the accumulation direction by the rotation of the motor.
Referring to FIG. 4, the transport unit 4 includes a drum 43, a motor 44 for rotating the drum 43, a transport belt 45, an inner belt 46, an outer belt 47, and a tension adjusting actuator 48.

The drum 43 has a horizontal rotation axis that is orthogonal to the conveyance direction, and is rotated counterclockwise in FIG. 4 by a motor 44 connected by a driving belt 49.
The conveyor belt 45 connects the drum 43 and the roller 50 on the upstream side of the drum 43, and the drum 43 rotates outward from the drum 43 so that the conveyor surface 51 moves from the upstream side toward the downstream side by the rotation of the drum 43. Circulate. The conveyance belt 45 conveys the booklet W in a state where the end portion of the upstream booklet W overlaps the end portion of the booklet W positioned on the downstream side on the conveyance surface 51. The conveyor belt 45 is formed of a plurality of thin belts spaced from each other. Since the transport belt 45 is driven by the rotation of the drum 43, the transport speed is the same as the peripheral speed of the drum 43.

The inner belt 46 is in contact with a quarter of the outer periphery of the drum 43 so that the angle of contact is about 90 degrees, starting from the top of the drum 43. Further, the inner belt 46 is wound around the outer periphery of the drum 43 between each of the plurality of transport belts 45. The inner belt 46 is disposed so as to be able to circulate outside the drum 43 so as to surround the drum 43 while being supported by a plurality of rollers while keeping a constant interval without overlapping with the conveyor belt 45.
The outer belt 47 is wound around the drum 43 so as to overlap the portion where the inner belt 46 is in contact with the drum 43, and is supported by a tension adjusting actuator 48 and a plurality of rollers to circulate outside the upper portion of the drum 43. Arranged as possible. The outer belt 47 leaves the inner belt 46 immediately after leaving the drum 43 below the drum 43. The outer belt 47 is provided below the printing book W conveyed by the conveying belt 45 with the inner belt 46 sandwiched between the drum 43 and the printing book W by changing its conveying direction. It works to send it out to the stacking unit 5.
The tension adjusting actuator 48 adjusts the clamping force when the outer belt 47 and the inner belt 46 transport the printing book W by the tension roller 53 increasing / decreasing the tension of the outer belt 47 by the expansion / contraction operation of the pneumatic cylinder 52.
The torque control unit 6 includes a computer and a servo controller (amplifier).

Next, the operation of the sheet material accumulating apparatus 1 will be described.
5 to 9 are diagrams showing the operation of the stacking unit 5.
As shown in FIG. 5, in the initial stage of stacking of the booklet W, the support arms 16 and 16 of the first holder unit 8 support the end of the bundle P of the booklet W on which the holders 17 and 17 are stacked. The support arm of the second holder part 10 and the fork of the fork part 12 are retracted below the table 7. The first holder portion 8 moves to the downstream side in accordance with the amount (thickness) of the bundle P of the printing book W that is accumulated and increased.

The movement of the first holder portion 8 to the downstream side facilitates the accumulation of the printing books W continuously conveyed from the conveying portion 4 and prevents the bundle P of the accumulated printing books W from collapsing. , 17 is carried out while maintaining a constant or predetermined force to press (push) the bundle P of the accumulated printing books W. The force with which the holders 17 and 17 push the bundle P of the printing book W is also a force F (hereinafter sometimes referred to as “back pressure F”) that the bundle P of the printing book W pushes back the holders 17 and 17.
In order to maintain the back pressure within a predetermined range, the torque control unit 6 drives the driving torque of the motor 23 (the driving torque is a force F ′ (F′≈F) applied to the fixture 2) and the pitch of the driving pulley 24. The first holder portion 8 is moved while controlling the product to be a predetermined value (FIG. 3).

  Specifically, the control of the movement of the first holder unit 8 by the torque control unit 6 is performed so that the set load current value (load torque) of the motor 23 input to the servo controller in advance is constant or within a predetermined range. This is performed by driving the motor 23 so as to be maintained (torque control). That is, the torque control unit 6 detects the load current (armature current) of the motor 23 with the servo controller, and determines the current value to be applied to the motor 23 by feeding back the detected load current.

For example, torque control is performed as follows.
When the printing book W is conveyed with the normal deviation continuously transferred from the conveying unit 4 to the stacking unit 5 and partially overlapped with the overlapping printing book W, the printing is performed. Since the growth of the bundle P of books W is rapid, the back pressure F applied to the holders 17 and 17 rises. The fixture 2 is fixedly integrated with the drive belt 3, and the back pressure F at that time is transmitted to the motor 23 via the fixture 2 and the drive pulley 24. In the motor 23, since the load increases, the load current flowing through the motor 23 increases. The torque control unit 6 detects an increase in the load current, decreases the drive torque of the motor 23, decreases the applied current to the servo controller so as to reach a predetermined value, and moves the first holder unit 8 downstream. To promote.
Further, when the overlapping portion of the transported booklet W and the booklet W becomes smaller than usual, the growth of the bundle P of the booklet W is slowed down, so the back pressure F applied to the holders 17 and 17 is Decrease. Then, the load torque of the motor 23 decreases and the load current decreases. The torque control unit 6 detects that the load current has decreased, controls the applied current so that the load current increases, and the force that pushes the bundle P of the printing book W of the holders 17 and 17 becomes an appropriate magnitude. In this way, the downstream movement of the first holder portion 8 is delayed.

In the sheet material accumulating apparatus 1, for example, an accumulated printing book is obtained by controlling the back pressure F from the bundle P of the printing books W applied to the holders 17, 17, that is, by controlling the load torque of the motor 23 to be constant. Accumulation environment such as resistance when newly inserted into W or the like can always be made constant. As a result, even when there is variation in the overlapping state of the printing books W conveyed from the conveying unit 4, the printing books W can be stably accumulated, and a well-prepared bundle W of printing books W can be obtained. it can.
Further, when the load torque is suddenly reduced, the first holder portion 8 can be moved upstream in order to recover the predetermined load torque.
Now, when the bundle P of the accumulated booklets W reaches a predetermined amount, the fluid pressure cylinder expands in the fork portion 12, and the forks 37, 37 are raised and accumulated as shown in FIG. The upstream side of the bundle P of W is supported. Subsequently, the fork portion 12 moves downstream to a position where the holder 28 of the second holder portion 10 is retracted. At this time, the first holder portion 8 moves downstream together with the fork portion 12.

As shown in FIG. 7, the second holder portion 10 extends the fluid pressure cylinder to move the holder 28 to the upstream side of the bundle P of the booklets W, and supports the bundle P of the booklets W. The bundle P of the already-booked printing books W is supported by the first holder portion 8 and the second holder portion 10 on both sides, and moves to the downstream side of the table 7. The moved book bundle W is bound by a binding band or the like at the destination. During this time, the newly transported printing book W is collected between the upstream surface of the forks 37 and 37 and the inner belt 46 as shown in FIG.
Whether or not the bundle P of the accumulated printing books W has reached a predetermined amount is determined based on whether or not the first holder portion 8 has reached a predetermined position, and the first holder portion 8 has reached a predetermined position. This detection is performed by, for example, a limit switch attached to the guide bar 19.

When the bundling of the bundles of accumulated booklets W is completed, the fluid pressure cylinder of the first holder portion 8 and the fluid pressure cylinder of the second holder portion 10 are contracted to move the holders 17 and 17 and the holders 28 and 28, respectively. Move to below table 7. The second holder portion 10 moves to a location located at the beginning of the stacking operation, and the first holder portion 8 has the upstream surface of the holders 17, 17 on the upstream surface of the forks 37, 37 (prints to be newly stacked. It moves to a position aligned with the surface supporting the bundle P of books W. As shown in FIG. 9, the moved first holder portion 8 extends the fluid pressure cylinder to raise the upstream surface of the holders 17, 17 to the downstream side of the bundle P of the booklet W, and thereby bundle the booklet W. Support P.
Thereafter, the fluid pressure cylinder contracts in the fork portion 12 to move the fork below the table 7, and the fork portion 12 moves to a retracted position upstream of the inner belt 46 as shown in FIG. 5.
By the series of operations of the sheet material accumulating apparatus 1 described above, one of the bundles P in which the printing books W are accumulated is formed.

Since the support arms 16 and 16 of the first holder portion 8 have a shape that protrudes the upper end to the upstream side, and the forks 37 and 37 have a shape that protrudes the upper end to the downstream side, as shown in FIG. , 16 and the forks 37, 37 can smoothly switch the support of the bundle P of the printing book W from the fork portion 12 to the first holder portion 8 without interfering with each other.
When the sheet material stacking apparatus 1 moves downstream while supporting the bundle P of the printed book W in which the first holder portion 8 and the second holder portion 10 are stacked (FIG. 8), the holder 17 , 17 and the holder, and the force with which the holder pushes the bundle P of the printing book W can be torque-controlled so as to have a preset value or set range, respectively. When the fork unit 12 supports and accumulates the printing book W on its upstream surface (FIG. 8), the force for pressing the bundle P of the printing book W on which the forks are accumulated is set to a preset value or setting. Torque control may be performed so as to be in the range.

In the above-described embodiment, the back pressure caused by the bundle P of the accumulated printing books W can be controlled by other methods. For example, the back pressure applied to the holder may be detected by a strain gauge provided between the holder and the support arm, and the drive of the motor of the first holder drive unit may be controlled so that the back pressure falls within a predetermined range.
The first holder driving unit 9, the second holder driving unit 11, and the fork driving unit 13 may be driven by a rotating screw and a drive nut, or driven by a rack and a pinion instead of the belt driving described above.
The detection of the back pressure and the movement of the first holder part may be performed by a method other than the method described above.
In addition, each structure of the sheet material accumulating apparatus 1 and the entire structure, shape, dimensions, number, material, and the like of the sheet material accumulating apparatus 1 can be appropriately changed in accordance with the spirit of the present invention.

The present invention can be used in a sheet material stacking method and apparatus for transporting and stacking sheet materials such as a printing book W in a state where the overlapping is shifted to the downstream side in the transport direction.

Claims (9)

A sheet material stacking method in which a part of the sheet material is continuously stacked and conveyed in a state where the sheet material is stacked on a horizontal table below.
Detecting the back pressure from the bundle applied to the holder for preventing the collapse of the front end side of the bundle of sheet materials accumulated on the table;
The sheet material accumulating method, wherein the movement of the holder in the accumulating direction is controlled so that the back pressure maintains a predetermined magnitude. Detection of back pressure from the bundle is performed by detecting load current to the electric motor for moving the holder,
The sheet material accumulation method according to claim 1, wherein the movement of the holder is controlled by controlling an electric current applied to the electric motor. A sheet material stacking method in which a part of the sheet material is continuously stacked and conveyed in a state where the sheet material is stacked on a horizontal table below.
In the process of retracting the bundle to newly accumulate the sheet material after the bundle of the sheet material has reached a certain size,
The front end side of the bundle to be retracted is supported by a first holder and the rear end side of the bundle is supported by a second holder,
Detecting back pressure from the bundle applied to the first holder and back pressure from the bundle applied to the second holder;
The sheet material accumulating method, wherein the movement of the first holder and the second holder in the accumulating direction is controlled so that the respective back pressures maintain respective predetermined magnitudes. Performing the respective back pressures by detecting load currents to the respective electric motors for retracting the first holder and the second holder;
The sheet material accumulating method according to claim 3, wherein the movement for retracting the first holder and the second holder is controlled by controlling an electric current applied to each electric motor. A sheet material stacking apparatus that stacks a part of the sheet material that is superimposed and continuously conveyed from above on a horizontal table below,
A holder for preventing the collapse of the front end side of the bundle of sheet materials accumulated on the table;
Back pressure detecting means for detecting back pressure from the bundle applied to the holder;
Holder moving means for moving the holder in the stacking direction of the sheet material;
Control means for controlling the operation of the holder moving means, the control means,
The sheet material accumulating device, wherein the holder moving means controls the movement of the holder based on the back pressure detected by the back pressure detecting means. The holder moving means has an electric motor,
The back pressure detection means has a load current detection device for the electric motor,
The control means includes
The sheet material accumulating device according to claim 5, wherein the sheet material accumulating device is configured to control movement of the holder by the electric motor based on a load current detected by the load current detecting device. The electric motor is a servo motor;
The control means includes
The sheet material accumulating apparatus according to claim 6, configured to control an applied current to the servo motor based on a load current detected by the load current detecting apparatus. A sheet material stacking apparatus that stacks a part of the sheet material that is superimposed and continuously conveyed from above on a horizontal table below,
A first holder for preventing the collapse of the front end side of the bundle of sheet materials accumulated on the table;
A second holder for supporting the rear end side of the bundle;
Back pressure detection means for detecting one or both of back pressure applied to the first holder and back pressure applied to the second holder from the bundle;
First holder moving means for moving the first holder in the stacking direction of the sheet material;
Second holder moving means for moving the second holder in the stacking direction of the sheet material;
Control means for controlling one or both of the operations of the first holder moving means and the second holder moving means,
The control means includes
Based on the back pressure detected by the back pressure detecting means, one or both of the movements of the first holder and the second holder by the first holder moving means and the second holder moving means are controlled. A sheet material accumulating device characterized by comprising: Each of the first holder moving means and the second holder moving means has an electric motor,
The back pressure detection means includes a load current detection device for each electric motor,
The control means includes
The sheet material accumulating device according to claim 8, wherein the sheet material accumulating device is configured to control movement of the first holder and the second holder by the electric motor based on each load current detected by the load current detecting device.

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