JP2001233492A - Air bleeding device and air bleeding method for sheet bundle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bleed air from between sheet materials constituting a sheet bundle while the sheet bundle is carried at satisfactory speed with a carrying means, and also prevent the shape deformation of the sheet bundle caused by carrying resistance from a pressure roller. SOLUTION: When the edge of the sheet bundle 14 on a roller conveyer 16 is detected with an edge sensor 64, the pressure roller 52 is lowered with an air cylinder 68 and brought into pressure contact with the top surface of the sheet bundle 14. A motor unit (not illustrated) connected to the pressure roller 52 rotates the pressure roller 52 at such rotating speed that the linear speed of the roller surface of the pressure roller 52 becomes equal to the carrying speed of the sheet bundle 14, an electromagnetic clutch (not illustrated) separates the motor unit from the pressure roller 52 immediately before the pressure roller 52 comes in contact with the sheet bundle 14, and the rotational resistance of the pressure roller 52 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet bundle for discharging air from between sheet materials constituting a sheet bundle while conveying a sheet bundle formed by stacking a plurality of sheet materials such as photosensitive printing plates. And an air bleeding method.

[0002]

2. Description of the Related Art A lithographic printing plate such as a photosensitive printing plate is subjected to surface treatment such as graining, anodic oxidation, chemical conversion treatment alone or in an appropriate combination on a support such as an aluminum plate or a steel plate. A photosensitive composition (including a heat-sensitive composition in the photosensitive composition) is applied. In such a lithographic printing plate, a strip-shaped web as a product material is cut along a longitudinal direction by a slitter and cut along a short direction by a cutter, and cut into a predetermined product size. This lithographic printing plate
A known sheet stacking device (for example, Japanese Patent Publication No. 4-5146)
No. 9), the sheets are stacked at a fixed number of sheets to form a sheet bundle. This sheet bundle is conveyed to the next step by conveying means such as a belt conveyor or a roller conveyor.
At this time, since air remains between the lithographic printing plates constituting the sheet bundle to form an air layer, the lithographic printing plates in the sheet bundle are very slippery. In order to prevent the collapse of the sheet bundle due to this, the sheet bundle is conveyed, for example, by pressing and holding the sheet bundle from above and below as disclosed in JP-A-59-217542, and moving the sheet bundle relative to each other. In some cases, the transfer may be performed by a transporting unit having a chucking mechanism for preventing the occurrence of the pressure.

However, when a sheet bundle is conveyed by a conveying means without using a chucking mechanism,
In order to prevent collapse of the sheet bundle during conveyance, it is necessary to limit the acceleration in the horizontal direction acting on the sheet bundle to a sufficiently small value, and the sheet bundle cannot be conveyed at high speed. On the other hand, when the sheet bundle is conveyed by the conveying means in a state where the sheet bundle is conveyed while being pressed and held by the chucking mechanism, the sheet bundle does not collapse during conveyance, but even after being released from the chucking mechanism, lithographic printing on the sheet bundle is performed. Since an air layer may remain between the plates, if the sheet bundle is conveyed at a high speed after being released from the chucking mechanism, the sheet bundle may be broken.

[0004]

Therefore, an air bleeding device is provided as an auxiliary equipment of the conveying means, and the sheet bundle on the conveying means is pressurized from above by a pressing member such as a roller by the air bleeding device. If the air between the plates is forcibly discharged, the collapse of the sheet bundle during the conveyance can be effectively prevented. However, when the pressing member comes into contact with the conveyed sheet bundle, frictional resistance (conveyance resistance) acts on the sheet bundle along the conveying direction corresponding to the conveying speed. If the sheet bundle is stopped by temporarily stopping the conveying means when the sheet is conveyed, or if the conveying speed of the sheet bundle by the conveying means is not sufficiently reduced, the sheet resistance is caused by the conveying resistance when the pressing member comes into contact with the sheet bundle. The bundles collapse. For this reason, in the conveying means provided with the air bleeding device as ancillary equipment, the conveying speed of the sheet bundle is slower than the conveying speed of the other conveying means.

Further, the sheet bundle is pressed by the pressing member of the air device while the sheet bundle is being conveyed by the conveying means in a state where the sheet bundle is pressed and held by the chucking mechanism, so that the sheet bundle can be conveyed without lowering the conveying speed of the sheet bundle. It is conceivable to discharge air from the sheet bundle, but even in this case, the pressing force on the sheet bundle by the chucking mechanism is limited according to the strength of the lithographic printing plate constituting the sheet bundle. For this reason, when the strength of the lithographic printing plate is low or the like, the pressure applied by the chucking mechanism 2 shown in FIG. 8 cannot be sufficiently increased, and as shown in FIG. A shift occurs between the lithographic printing plates constituting the sheet bundle 4 that has received the conveyance resistance, and air is discharged from the sheet bundle 4 while the shift occurs. As a result, it is difficult to correct a shift generated in the sheet bundle 4 in a later process.

In view of the above facts, the present invention conveys a sheet bundle by a conveying means at a sufficiently high speed and discharges air from between sheet materials constituting the sheet bundle, and furthermore, the sheet bundle does not collapse. An object of the present invention is to provide an air bleeding device for a bundle.

[0007]

According to a first aspect of the present invention, there is provided an air bleeding device for a sheet bundle, comprising: a conveying means for conveying a sheet bundle in which a plurality of sheet materials are stacked in a predetermined conveying direction; and the conveying means. A pressure roller, which is rotatably supported above, and is arranged so that the transport direction is tangential to the roller surface during rotation, and a sheet bundle transported by the transport means to just below the pressure roller. The pressure roller is lowered so that the roller surface comes into pressure contact with the upper surface of the sheet bundle, and when the sheet bundle separates from immediately below the pressure roller, the pressure roller is moved to the next position by the conveying means. An elevating means for elevating the roller surface to a position higher than the upper surface, wherein when the roller surface contacts the upper surface of the sheet bundle, the linear velocity of the roller surface is equal to the conveying speed of the sheet bundle by the conveying device. Wherein those having a rotary drive means for rotating the pressure roller. According to the air release device for a sheet bundle having the above configuration, when the roller surface of the pressure roller comes into pressure contact with the upper surface of the sheet bundle conveyed by the conveyance unit, the rotation driving unit sets the linear velocity of the roller surface of the pressure roller By rotating the pressure roller so that is equal to the conveyance speed of the sheet bundle by the conveyance means, even when the roller surface of the pressure roller is pressed against the sheet bundle, the pressure roller is moved along the conveyance direction from the pressure roller to the sheet bundle. Since the frictional resistance hardly acts, even if an air layer exists between the sheet materials in the sheet bundle and the conveying speed of the sheet bundle by the conveying means is high, the sheet bundle collapses due to the frictional resistance from the pressure roller. Disappears. As a result, the air can be reliably discharged from the plurality of sheet members constituting the sheet bundle by the action of the pressing force from the pressure roller without causing the sheet bundle to collapse.

The linear velocity of the roller surface is controlled by the conveying means during the period from when the pressure roller is lowered by the elevating means and comes into contact with the upper surface of the sheet bundle to when the sheet bundle separates downstream. It is sufficient that the transport speed, that is, the moving speed of the sheet bundle in the transport direction is equal, and it is not necessary to always make the linear velocity of the roller surface equal to the moving speed of the sheet bundle.

After the pressure roller is pressed against the sheet bundle, the rotation driving means may be deactivated to rotate the pressure roller by a force transmitted from the sheet bundle in the conveying direction. The pressure roller may be continuously rotated by the driving force from the means.

According to a second aspect of the present invention, there is provided the air release device for a sheet bundle according to the first aspect.
The apparatus has a chucking means for pressing and holding the sheet bundle conveyed by the conveying means from above and below along the thickness direction.

According to the air releasing device for a sheet bundle having the above structure, the chucking means presses and holds the sheet bundle conveyed by the conveying means from above and below, so that the sheet material in the sheet bundle is separated from the chucking means by the chucking means. A frictional force corresponding to the pressing force acts on the sheet material, and the frictional force acts as a restraining force for suppressing the relative movement between the sheet materials. Even if frictional resistance acts, the sheet bundle does not collapse. As a result, when the pressure roller is pressed against the upper surface of the sheet bundle, the linear velocity of the roller surface may have an error with respect to the transport speed of the sheet bundle by the transport unit, or the transport speed of the sheet bundle by the transport unit may be instantaneous. Even when the sheet bundle changes (chattering), if the pressure applied to the sheet bundle by the chucking means is sufficiently increased, it is possible to prevent the sheet bundle from collapsing due to the conveyance resistance from the pressure roller.

According to a third aspect of the present invention, in the air release device for a sheet bundle according to the first or second aspect, the rotary driving unit presses the rotation drive unit immediately before the pressure roller contacts the sheet bundle. It has clutch means for separating from the roller.

According to the air release device for a sheet bundle having the above structure, the clutch means separates the rotary drive means from the pressure roller immediately before the pressure roller comes into pressure contact with the sheet bundle. Since the rotational resistance of the pressure roller can be reduced compared to when the pressure roller is pressed, the rotational resistance of the pressure roller is reduced when the pressure roller that is rotating due to inertial force is pressed against the upper surface of the sheet bundle. As a result, collapse of the sheet bundle can be suppressed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An air bleeding device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a processing line 110 for a photosensitive printing plate (hereinafter referred to as PS plate) to which an air bleeding device 10 according to an embodiment of the present invention is applied. Upstream side of this processing line 110 (upper right side in FIG. 1)
Is provided with a feeder 114 for sequentially unwinding a web 112 wound in a roll shape in advance. Transmitter 11
The long web 112 sent out from 4 is a leveler 11
When the curl is corrected in step 5 and the sheet reaches the feed roller 116, the slip sheet 118 is attached to the sheet and adheres to the notch 120 by charging.

The notcher 120 has a punched portion on the web 112 so that the upper blade of the cutting roller 122 can move in the width direction of the web 112 at the punched position. This makes it possible to change the cutting width of the web 112 while continuously cutting the web 112 and the interleaf 118 together. The cutting waste generated by the cutting is sent to a chopper (not shown) to be cut into small pieces.
Is collected in the collection box 126.

In the processing line 110 of the present embodiment, a cutting unit 128 is constituted by the cutting roller 122 and peripheral members (not shown), and two sets of the cutting unit 128 are prepared. Thus, a setup operation such as blade replacement can be performed by the unused cutting unit 128 outside the line, and the line stop time of the processing line 110 can be minimized.

In this manner, the web 112 cut to a predetermined cutting width has its feed length detected by the length measuring device 130 and is cut by the running cutter 132 at the designated timing. Thereby, the PS plate 12 of the set size is set.
Is manufactured. The PS plate 12 is a belt conveyor 13
4, the sheet bundle 14 is conveyed to the stacking device 136 and stacked by a predetermined number.

The roller conveyor 16 and the chucking mechanism 18 are arranged downstream of the accumulating device 136.
As shown in FIG. 2, the roller conveyor 16 rotatably supports a plurality of free rollers 20 arranged along the conveying direction of the sheet bundle 14 (direction of arrow C) and both ends of each free roller 20. A pair of roller frames 22 are provided. These free rollers 20 are supported by a roller frame 22 via bearing members 21 (see FIG. 4) such as roller bearings, and the rotation resistance is extremely reduced by the action of the bearing members. The free rollers 20 are arranged such that their axes are orthogonal to the transport direction and are precisely located at the same position in the height direction. Thereby, the roller conveyor 16
The sheet bundle 14 placed thereon can be moved in the transport direction with an extremely small force.

The chucking mechanism 18 is arranged outside one of the roller frames 22 as shown in FIG. The chucking mechanism 18 is provided with a guide rail 24 (see FIG. 1) whose longitudinal direction is the transport direction. The guide rail 24 supports the carrier 26 so as to be movable in the transport direction. The carrier 26 is provided with a pair of chucking portions 28 at both ends along the transport direction. The chucking portion 28 has a substantially U-shape that opens toward the roller conveyor 16, and each of the chucking portions 28 has a
Is connected to the guide rail 24 via a connecting rod 30 shown in FIG.

A movable plate 32 and a fixed plate 34 extending horizontally to the roller conveyor 16 are provided at the upper and lower ends of the pair of chucking portions 28, respectively, as shown in FIG. The unit 28 is configured to press and hold the end of the sheet bundle 14 by the movable plate 32 and the fixed plate 34. Here, the movable plate 32 is movably supported in the thickness direction of the sheet bundle 14, and is driven in the thickness direction by a driving force from a driving source (not shown) such as an electromagnetic solenoid or an air cylinder built in the chucking unit 28. Descend or rise along. The position of the upper surface of the fixing plate 34 is accurately positioned so as to be the same as the top line of the free roller 20 of the roller conveyor 16.

As shown in FIG. 2, the carrier 26 of the chucking mechanism 18 is provided with a base portion 36 for connecting a pair of chucking portions 28. On the side surface of the base portion 36 opposite to the roller conveyor 16, connection portions 38 are provided at both ends in the transport direction, and both ends of the chain 40 are connected to the pair of connection portions 38, respectively. Chain 40 is wound around a pair of sprockets 42, 44, and these sprockets 4
2, 44 in the transport direction.

The pair of sprockets 42 and 44 are arranged outside both ends of the roller conveyor 16 in the transport direction. Here, the downstream sprocket 42 is rotatably supported by a bearing member 46, and the upstream sprocket 44 is connected to a drive motor 48. By rotating the drive motor 48 forward or backward, the driving force from the drive motor 48 is transmitted via the chain 40 and the carrier 26 moves forward or backward along the transport direction.

Above the roller conveyor 16, a roller pressing mechanism 50 of the air venting device 10 is arranged as shown in FIGS. Here, the air release device 10 includes a roller pressing mechanism 50, a roller conveyor 16, a chucking mechanism 18, and a control circuit (not shown) for controlling these.
And the like. The roller pressing mechanism 50 is provided with a pressing roller 52 supported in parallel with the free roller 20 of the roller conveyor 16.
Is rotatably supported by a plate-like roller frame 56 bent in a substantially U-shape via a bearing member 54.

As shown in FIG. 2, a motor unit 58 in which a motor and a speed reducer are integrated is disposed outside the roller frame 56, and the output shaft of the motor unit 58 is pressurized via an electromagnetic clutch 60. It is connected to a roller 52. Here, when the drive voltage is applied by the control circuit and the electromagnetic clutch 60 is turned on, torque transmission from the motor unit 58 to the pressure roller 52 becomes possible, and the application of the drive voltage is interrupted and the electromagnetic clutch 60 is turned off. Is turned off, the motor unit 58
Disconnected from 2. Thus, the pressure roller 52 can rotate with a very small force compared to when the electromagnetic clutch 60 is on without receiving the rotation resistance from the motor unit 58.

In the motor unit 58, the moving speed of the carrier 26 which advances by the driving force from the driving motor 48, that is, the rotation speed of the motor and the reduction ratio of the speed reducer corresponding to the conveying speed of the sheet bundle 14 are set. I have. Specifically, a rotation speed and a reduction ratio are set in the motor unit 58 such that the linear speed of the roller surface 52A of the pressure roller 52 matches the transport speed of the sheet bundle 14. Accordingly, when the motor unit 58 is turned on by the control circuit, the pressure roller 52 rotates at a rotational speed such that the linear speed of the roller surface 52A matches the transport speed of the sheet bundle 14.

As shown in FIG. 3, an elongated plate-like sensor support member 62 extending to the downstream side and the upstream side in the transport direction with respect to the roller frame 22 is fixed to the upper surface of the roller frame 22. . This sensor support member 6
Edge sensors 64 and 66 each composed of a photoelectric switch, an ultrasonic sensor, and the like are arranged at both ends in the transport direction of No. 2 respectively. The edge sensors 64 and 66 detect the front end and the rear end of the sheet bundle 14 conveyed by the roller conveyor 16, respectively, and output a front end detection signal and a rear end detection signal to the control circuit.

In the roller pressing mechanism 50, an air cylinder 68 is disposed above the pressing roller 52 as shown in FIG. The air cylinder 68 has an intake port 70.
And an exhaust port 72 are provided.
8 closes the exhaust port 72, raises the rod 69 when high-pressure air is supplied through the intake port 70, and closes the intake port 70 when the rod 69 is at the upper limit position and opens the rod when the exhaust port 72 is opened. 69 descends at a slow and constant speed. Here, the intake port 70 is piped to a high-pressure air supply source such as an air tank, and an intake solenoid valve (not shown) is arranged in the pipe. The exhaust port 72 is opened to the outside (atmosphere) through an exhaust solenoid valve (not shown). The opening and closing states of these intake and exhaust solenoid valves are controlled by signals from a control circuit.

The tip of the air cylinder 68 is fixed to the center of the roller frame 56 in the width direction. Thus, when the rod 69 of the air cylinder 68 is at the upper limit position, the lower end of the pressure roller 52 is held at a standby position slightly higher than the upper surface of the sheet bundle 14 on the roller conveyor 16 as shown in FIG. You. Here, the upper limit position of the rod 69 can be adjusted according to the thickness of the sheet bundle 14. At a predetermined timing, the exhaust port 72 is opened, and the pressure roller 52 is moved by the air cylinder 68 to the sheet bundle 1.
When the pressure roller 52 is lowered on the upper surface 4, the pressure roller 52 comes into pressure contact with the upper surface of the sheet bundle 14 with a pressing force corresponding to its own weight and the weight of the rod 69.

(Operation of Embodiment) Next, the operation and operation of the air bleeding device 10 according to the embodiment of the present invention will be described.

When the control device determines that the sheet bundle 14 is formed by stacking a predetermined number of PS plates 12 by the integration device 136, the control circuit controls the drive motor 48 of the chucking mechanism 18 to transfer the carrier 26 to the integration device 136. Is moved to the stacking position of the sheet bundle 14. At this time, the movable plate 32 of the chucking section 28 is held at the release position farthest from the fixed plate 34, and when the carrier 26 moves to the stacking position, the sheet bundle 14 is placed between the movable plate 32 and the fixed plate 34. Is inserted in the width direction.

When the carrier 26 moves to the accumulation position, the control circuit moves the movable plate 32 of the chucking section 28 in the direction of the fixed plate 34, and the sheet is moved by the movable plate 32 and the fixed plate 34 as shown in FIG. The ends of the bundle 14 are pressed and held at a predetermined pressure. Thus, the carrier 26 and the sheet bundle 14 are connected so as to move integrally on the roller conveyor 16 in the transport direction.

When the carrier 26 is connected to the sheet bundle 14, the control circuit operates the drive motor 48 of the chucking mechanism 18.
Is rotated forward to apply a driving force along the transport direction to the carrier 26 and the sheet bundle 14 connected thereto. As a result, the sheet bundle 14 and the carrier 26 are
6 and onto the roller conveyor 16 and the sheet bundle 1
Reference numeral 4 denotes a state in which the movement resistance is suppressed by the roller conveyor 16, and the movement in the transport direction is continued by the driving force from the chucking mechanism 18.

The control circuit synchronizes with the driving of the drive motor 48 of the chucking mechanism 18 to synchronize with the roller pressing mechanism 50.
The electromagnetic clutch 60 is turned on and the motor unit 58 is driven. Thus, as described above, the pressure roller 52 rotates at a rotational speed such that the linear speed of the roller surface 52A is equal to the transport speed of the sheet bundle 14. At this time, the air cylinder 68 holds the rod 69 at the upper limit position as shown in FIG.

When the sheet bundle 14 on the roller conveyor 16 moves to the position shown in FIG.
The edge sensor 64 mounted on the roller frame 56 detects the leading edge of the sheet bundle 14 and outputs a leading edge detection signal to the control circuit. In synchronization with this, the control circuit opens the exhaust electromagnetic valve to exhaust the air in the air cylinder 68 through the exhaust port 72, and turns off the electromagnetic clutch 60 to disconnect the motor unit 58 from the pressure roller 52. As a result, the pressure roller 52 descends from the standby position and comes into contact with the leading end of the upper surface of the sheet bundle 14. At this time, even if the pressure roller 52 is separated from the motor unit 58, the rotational speed is maintained at substantially the same rotational speed immediately before the electromagnetic clutch 60 is turned off due to the inertial force due to the inertial force. That is, when contacting the sheet bundle 14, the pressure roller 52 is rotating at a rotational speed such that the linear velocity of the roller surface 52 </ b> A is substantially equal to the moving speed of the sheet bundle 14.

In consideration of the time lag from when the electromagnetic clutch 60 is turned off to when the electromagnetic clutch 60 comes into contact with the sheet bundle 14, the rotation speed of the pressure roller 52 when the electromagnetic clutch 60 is turned off is determined by the roller. The linear speed of the surface 52A may be set to be slightly higher than the moving speed of the sheet bundle 14.

The pressing roller 52 in contact with the sheet bundle 14 applies a pressing force corresponding to its own weight and the weight of the rod 69 of the air cylinder 68 to the sheet bundle 14 and also applies a force from the sheet bundle 14 moving in the transport direction. Receiving and rotating clockwise. As a result, air (air layer) remaining between the PS plates 12 constituting the sheet bundle 14 moves from the leading end of the sheet bundle 14 to the rear end side, and the sheet bundle 14 is
When moving to the position where the sheet bundle 14 is separated from the sheet bundle 14, the air that has moved to the rear end side of the sheet bundle 14 is discharged to the outside from between the rear ends of the PS plates 12 constituting the sheet bundle 14. Here, the pressing roller 52 directly presses only the portion of the sheet bundle 14 facing the roller conveyor 16 and does not directly press the end of the sheet bundle 14 projecting from the roller conveyor 16 toward the chucking mechanism 18. The end of the sheet bundle 14 is pressed and held by the chucking section 28 of the chucking mechanism 18. As a result, air is discharged from the end of the sheet bundle 14 that receives the pressing force from the chucking unit 28 without being pressed by the pressing roller 52.

When the sheet bundle 14 separates from the pressure roller 52 and moves to the position shown in FIG. 7, the edge sensor 66 detects the rear end of the sheet bundle 14 and outputs a rear end detection signal to the control circuit. . In synchronization with this, the control circuit closes the exhaust solenoid valve (not shown) and opens the intake solenoid valve to supply high-pressure air into the air cylinder 68 through the intake port 70. Thereby, the air cylinder 68 raises the rod 69 and holds it at the upper limit position. At this time,
The lower end of the pressure roller 52 is positioned at the upper surface of the sheet bundle 14 to be conveyed next on the roller conveyor 16 (level L).
It is held at a higher position.

The control circuit controls the air bleeder 10 to repeat the above-described operation of transporting the sheet bundle 14 and the operation of discharging air to the sheet bundle 14 each time the sheet bundle 14 is formed by the accumulating device 136.

The sheet bundle 14 from which air has been discharged from between the PS plates 12 by the air release device 10 is placed on the belt conveyor 1 disposed downstream of the roller conveyor 16 shown in FIG.
The transport is continued by 38. This belt conveyor 13
8, since air is almost completely exhausted from the sheet bundle 14 at the time of conveyance, even if a large acceleration is applied by conveying at a high speed by the belt conveyor 138, the sheet bundle 14 is applied to the sheet bundle 14 by the frictional force between the PS plates 12. No collapse occurs.

The sheet bundle 14 conveyed to the most downstream portion of the belt conveyor 138 is reloaded on the pallet 142 by the chucking mechanism 140 shown in FIG. The pallet 142 on which the sheet bundle 14 is placed is conveyed to the next step by the pallet conveyor 144 and the pallet carrier 146.

According to the air bleeding device 10 according to the present embodiment described above, the pressure roller 52 is
The motor unit 58 rotates the pressure roller 52 so that the linear velocity of the roller surface 52A becomes equal to the conveying speed of the sheet bundle 14 when the sheet unit 14 is pressed against the upper surface of the sheet bundle 14 conveyed by the chucking mechanism 6 and the chucking mechanism 18. By doing so, when the pressure roller 52 discharges the air of the sheet bundle 14, the frictional resistance does not act on the sheet bundle 14 from the pressure roller 52 to the sheet bundle 14.
In the case where an air layer exists between the PS plates 12 and the conveying speed of the sheet bundle 14 by the chucking mechanism 18 is high, the sheet bundle 14 does not collapse due to frictional resistance from the pressure roller 52.

In the air release device 10, the chucking means presses and holds the sheet bundle conveyed by the conveying means from above and below, so that the PS plate 1 in the sheet bundle 14 is pressed.
Since a frictional force corresponding to the pressing force from the chucking mechanism 18 acts between the two plates 2, the frictional force acts as a restraining force for suppressing relative movement between the PS plates 12, and is within the limit of the restraining force. In this case, even if a frictional resistance is applied from the pressure roller 52 in the conveying direction, the sheet bundle 14 does not collapse.
As a result, when the pressure roller 52 is pressed against the upper surface of the sheet bundle 14, the linear velocity of the roller surface 52 </ b> A has an error with respect to the transport speed of the sheet bundle 14 by the transport unit, or the sheet bundle by the chucking mechanism 18. When the transfer speed of the transfer roller 14 is instantaneously changed (chattering),
It is possible to prevent the sheet bundle 14 from collapsing due to the conveyance resistance from the sheet bundle.

In the air release device 10, the pressure roller 5
The electromagnetic clutch 60 disconnects the motor unit 58 from the pressure roller 52 immediately before the second roller 2 comes into pressure contact with the sheet bundle 14, so that the rotation of the pressure roller 52 is smaller than when the motor unit 58 is connected by the electromagnetic clutch 60. Since the resistance can be reduced, when the pressure roller 52 rotating by the inertial force is pressed against the upper surface of the sheet bundle 14, the rotation resistance of the pressure roller 52 becomes the conveyance resistance and the sheet bundle 1
4 can be prevented from being collapsed.

[0045]

As described above, according to the air release device and the air release method for a sheet bundle according to the present invention, the sheet bundle is conveyed at a sufficiently high speed by the conveying means while the sheet bundle is formed between the sheet members. The air can be discharged, and the sheet bundle does not collapse due to the conveyance resistance from the pressure roller.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a PS plate manufacturing line to which an air bleeding device according to an embodiment of the present invention is applied.

FIG. 2 is a plan view illustrating a configuration of an air vent device according to the embodiment of the present invention.

FIG. 3 is a side view showing a configuration of an air bleeding device according to the embodiment of the present invention along a transport direction.

FIG. 4 is a side view along the axial direction showing a configuration of a chucking mechanism and a roller conveyor in the air release device according to the embodiment of the present invention.

FIG. 5 is a side view along a conveyance direction showing a roller pressing mechanism in the air bleeding device according to the embodiment of the present invention, and shows a state when the pressing roller starts to descend.

FIG. 6 is a side view along a conveyance direction showing a roller pressing mechanism in the air bleeding device according to the embodiment of the present invention, and shows a state immediately after the pressing roller contacts a sheet bundle.

FIG. 7 is a side view along a conveyance direction showing a roller pressing mechanism in the air bleeding device according to the embodiment of the present invention, and shows a state immediately after the sheet bundle is separated from the pressing roller.

FIG. 8 is a perspective view showing a sheet bundle in which a deviation occurs between planographic printing plates by a conventional air release device.

[Explanation of symbols]

Reference Signs List 10 air release device 12 PS plate (sheet material) 14 sheet bundle 16 roller conveyor (conveying unit) 18 chucking mechanism (conveying unit, chucking unit) 52 pressure roller 58 motor unit (rotation driving unit) 60 electromagnetic clutch (clutch) means)

Claims (4)

[Claims] A transport unit configured to transport a sheet bundle in which a plurality of sheet materials are stacked in a predetermined transport direction; and a roller rotatably supported above the transport unit and rotating in the transport direction. A pressure roller disposed so as to be in a tangential direction of the surface, and the pressure roller is lowered so that the roller surface comes into pressure contact with the upper surface of the sheet bundle conveyed to just below the pressure roller by the conveyance unit. Raising and lowering means for raising the pressure roller to a position higher than the upper surface of a sheet bundle conveyed next by the conveying means when the sheet bundle separates from immediately below the pressure roller; and Rotating drive means for rotating the pressure roller so that the linear velocity of the roller surface is equal to the transport speed of the sheet bundle by the transport means when the roller surface contacts the upper surface of the roller. Air vent apparatus of the sheet bundle, characterized in that. 2. The air release device for a sheet bundle according to claim 1, further comprising a chucking unit that presses and holds the sheet bundle conveyed by the conveying unit from above and below along a thickness direction. 3. The air release device for a sheet bundle according to claim 1, further comprising a clutch unit that disconnects the rotation driving unit from the pressure roller immediately before the pressure roller comes into contact with the sheet bundle. 4. A method for removing air from a plurality of sheets constituting a sheet bundle by using the air release apparatus for a sheet bundle according to claim 1, wherein the lifting and lowering is performed. Means to lower the pressure roller, and press the roller surface against the upper surface of the sheet bundle conveyed to just below the pressure roller by the conveyance means,
By rotating the pressure roller by the rotation driving means,
A method for removing air from a sheet bundle, wherein the linear velocity of the roller surface is made equal to the conveying speed of the sheet bundle by the conveying means when the roller surface contacts the upper surface of the sheet bundle.