JP2003076031A - Automatic exposure system for printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make reliably removable dust on the surface of a printing plate by blowing air to the printing plate and to suppress uneven exposure when the printing plate is exposed. SOLUTION: When a photopolymer plate 102 is positioned on a surface plate 110 and conveyed to an exposure section 112 while retaining the flatness, dust 254 freezing to the surface of the photopolymer plate 102 by adhesive power or static electricity is made similar in condition to dust 254 which is simply on the surface of the photopolymer plate 102 by lightly rubbing the surface of the photopolymer plate 102 with the bristles 258 of a brush 256 before air for blowing dust 254 off is blown, accordingly the effect of air to blow dust off can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention positions a printing plate at a predetermined position and maintains the planarity of the printing plate along a predetermined transport path from a first position to a second position. The present invention relates to a printing plate automatic exposure device that is provided with a movable platen and is capable of exposing an image by irradiating the surface of the printing plate positioned at the first position with light based on image information at the second position. .

[0002]

2. Description of the Related Art A photosensitive layer (for example, a photopolymerizable layer) on a support
A technique has been developed in which a printing plate such as a photopolymer plate provided with is used to record an image directly on a photosensitive layer (photopolymerization layer) of the printing plate by a laser beam or the like (printing plate automatic exposure device). With such a technique, it is possible to quickly record an image on a printing plate.

In a printing plate automatic exposure apparatus which uses a technique of recording an image on a printing plate, a magazine containing a large number of printing plates stacked therein is loaded, and the printing plates are printed one by one from this magazine. It has been proposed that it can be taken out and sent to the exposure unit.

That is, the printing plate taken out is positioned on the apparatus at a predetermined position with respect to the apparatus and is sent onto a surface plate which can be conveyed in the positioned state.

In the surface plate, for example, air is sucked from a suction hole provided on the surface of the surface plate to position and hold the placed printing plate.

The platen is capable of reciprocating from a position for receiving a printing plate (first position) to an exposure unit (second position). Therefore, the printing plate positioned on the surface plate is transported to the exposure unit at a predetermined transport speed while maintaining its flatness. This carrying direction coincides with the sub-scanning direction in the exposure unit, and the light beam emitted based on a predetermined image signal from the exposure head provided in the exposure unit during the sub-scanning carrying out main scanning. , An image can be exposed on the surface of the printing plate.

The printing plate that has been exposed in the exposure section is sent to the next step when the platen returns to the first position.

Here, dust may be accumulated on the surface of the printing plate on the surface plate. Therefore, an air blow unit is provided in the middle of conveyance between the first position and the second position. In the air blow section, air having a predetermined pressure and a predetermined flow rate is blown toward the surface of the printing plate. The air blows off the dust on the printing plate, and it is possible to prevent uneven exposure due to dust during exposure at the exposure unit.

[0009]

However, some dust particles are firmly attached to the printing plate due to adhesive force, static electricity, etc. Sometimes it cannot be removed.

In view of the above facts, the present invention is capable of reliably removing dust on the surface of the printing plate by blowing air onto the printing plate, and suppressing unevenness of exposure during exposure. The purpose is to obtain a device.

[0011]

According to a first aspect of the present invention, the printing plate is positioned in a predetermined position, and the first position to the second position are determined in advance while the flatness of the printing plate is maintained. A surface plate movable along the transport path
To the surface of the printing plate positioned at the position
Is an automatic printing plate exposure device capable of exposing an image by irradiating light based on image information at the position of, and is provided on the way of the conveyance path from the first position to the second position, Air blow means for blowing a predetermined pressure and a predetermined flow rate of air toward the surface of the printing plate positioned above, and a state in which dust on the printing plate can be blown off by the air of the air blowing means. And a blow-off triggering means.

According to the first aspect of the present invention, when the air blowing means blows air at a predetermined pressure and a predetermined flow rate, sticky dust or dust charged with static electricity is blown off. It may not be done. Therefore, the blow-off trigger means changes the dust that remains even by the simple air blowing to a state in which it can be blown off by the air of the air blowing means. As a result, the dust can be reliably blown off by the air of the air blowing means, and it is possible to eliminate the problem that the dust becomes a shadow at the time of exposure and causes uneven exposure.

According to a second aspect of the present invention, in the invention according to the first aspect, the blow-off trigger means is provided in the vicinity of the air outlet of the air blow means and on the upstream side of the conveyance, and the tip portion is the above-mentioned. It is characterized in that it is an aggregate of bristle materials that are in contact with the surface of the printing plate at a predetermined pressure.

According to the second aspect of the invention, a so-called brush is arranged upstream of the air blowing means. The tip of the bristles of this brush slides relative to the surface of the printing plate that is being conveyed by bringing it into contact with the surface of the printing plate with a predetermined pressure, so that dust and static electricity with adhesiveness can be removed. The holding force on the printing plate can be reduced with respect to dust and the like that are charged and charged. Since air is blown in this reduced state, it can be reliably removed from the surface of the printing plate.

According to a third aspect of the invention, in the invention of the second aspect, a plurality of bristles are provided so that the aggregate of bristles protrudes radially from the peripheral surface of the rotating shaft. It is characterized by being a brush roller.

According to the third aspect of the present invention, instead of a flat brush, a brush roller is arranged and is rotated at a predetermined number of rotations, for example, in directions opposite to the transport direction of the platen. As a result, the relative sliding speed with respect to the surface plate can be increased, so that the dust holding force can be further reduced.

The invention according to a fourth aspect is characterized in that, in the invention according to the first aspect, the blow-off trigger means is a control for periodically changing the pressure and flow rate of air by the air blow means. .

According to the fourth aspect of the present invention, rather than blowing air at a constant pressure and a constant flow rate, the pressure and the flow rate are periodically changed so that dust on the surface of the printing plate can be prevented. It becomes possible to promote reduction of holding power.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows an automatic exposure apparatus 100 for photopolymer plates according to this embodiment.

The automatic exposure apparatus 100 includes a plate accommodating portion 104 for accommodating the photopolymer plate 102 (see FIG. 2) mounted on the carriage 200, and a sheet-fed portion 106 for taking out the photopolymer plate 102 accommodated in the plate accommodating portion 104. A platen 110 for positioning and holding the photopolymer plate 102, and a plate feeding unit 108 for sending the photopolymer plate 102 taken out by the sheet-feeding unit 106 as the sheet-fed device of the present invention to the platen 110.
And the photopolymer plate 10 positioned on the surface plate 110
2 and an exposure unit 112 that records an image.

An automatic developing device 116 can be set on the downstream side of the automatic exposure device 100 via a buffer section 114, and plate supply, exposure, and development can all be automatically processed. There is.

As shown in FIG. 2, the plate accommodating portion 104 is capable of accommodating a carriage 200 on which a plurality of photopolymer plates 102 are leaned.

The plate accommodating portion 104 has a floor portion 104A formed at a position higher than the road surface, and the carriage 200 is constructed so that it can be climbed onto the floor portion 104A from the road surface. That is, the caster 120 is supported on the road surface via the caster 120, and the caster 120 is movable to the projecting position (imaginary line position in FIG. 2) and the housing position (solid line position in FIG. 2) with respect to the carriage 200. Has become.

The casters 120 move to the storage position so as to be folded up in response to the storage operation in the plate storage section 104, and at the same time, the auxiliary roller 122 corresponds to the floor section 104A, and the carriage 200 after that moves to the floor section. It has a structure in which it is supported to 104A via this auxiliary roller 122.

The carriage 200 is provided with a stacking section 206, and a magazine 208 is leaned against the stacking section 206 at a predetermined angle and loaded. In the magazine 208, a large number (for example, several tens) of the photopolymer plates 102 are preliminarily stacked and housed, and the cart 200 is mounted on the plate housing unit 10.
By loading No. 4, the photopolymer plate 102 is loaded in the plate accommodating unit 104.

Each of the photopolymer plates 102 has one
The surface (the surface on the photosensitive layer side formed by the photopolymerization layer) of each sheet is covered and protected by a slip sheet (not shown). As a result, the photopolymer plate 102 and the interleaving paper 118 are alternately stacked in the magazine 208. As shown in FIGS. 1A and 2, the magazine 208 is provided with a shutter 210. By keeping the shutter 210 in a closed state except in a dark room, the photopolymer plate 102 is not necessary. Prevents unwanted exposure.

The photopolymer plate 102 is opposed to the sheet portion 106 in a state of being inclined at a predetermined angle by loading the carriage 200 into the plate accommodating portion 104. In addition, the shutter 210 of the magazine 208 uses the carriage 200 for the plate housing unit 1.
The photopolymer plate 102 can be taken out from the magazine 208 by loading it on the plate 04 and opening the plate containing portion 104 in a light-shielded state.

The single-wafer portion 106 provided above the plate accommodating portion 104 has a suction cup 124.
4 is used to suck the interleaving paper 118 and the photopolymer plate 102 at predetermined positions on the upper ends thereof, and the interleaving paper 118 and the photopolymer plate 102 are sequentially taken out from the magazine 208.
Send to 08.

The plate supply section 108 is roughly divided into a common transfer section 128 for receiving and transferring the photopolymer plate 102 or the interleaf sheet 118 from the sheet section 106, and a common transfer section 128 for receiving the photopolymer plate 102 and sending it to the surface plate 110. For transporting the photopolymer plate, the interleaf paper transport unit 134 for receiving the interleaf paper 118 and sending it to the interleaf paper storage box 132 provided in the carriage 200, and the photopolymer plate transport unit 130 from the common transport unit 128. Alternatively, the slip sheet transport unit 134
And a switching conveyance unit 136 that guides the conveyance unit to any of the above by a switching operation.

That is, since the photopolymer plate 102 and the interleaving paper 118 are alternately laminated in the plate feeding unit 108, the switching / conveying unit 1 is adsorbed every time the sheet unit 106 adsorbs.
36 is switched, and the structure is such that each is conveyed in a predetermined direction.

As shown in FIG. 2, the common transport section 128 is used.
, The roller 128A is separated from the roller 128B (shown by a broken line in FIG. 2), and when the sheet 106 removes the photopolymer plate 102 or the interleaf sheet 118, the roller 128A moves toward the roller 128B. (Indicated by a solid line in FIG. 2), the leading end of the taken-out photopolymer plate 102 or the interleaving paper 118 is nipped and sent to the switching / transporting unit 136. The switching / transporting unit 136 moves from the magazine 208 to the slip sheet 11
8 is taken out, the interleaving paper 116 is passed through the interleaving paper transport unit 13
The transport path is switched so as to transport toward 4 (indicated by a broken line in FIG. 2).

The carriage 200 is provided with an interleaf sheet storage box 132, and the interleaf sheet 118 taken out from the magazine 208 by the sheet feeding unit 106 is interleaved sheet storage box provided in the truck 200 by the interleaf sheet transport unit 134. You will be guided to 132.

On the other hand, when the photopolymer plate 102 is taken out from the magazine 208, the conveying path is switched so that the switching conveying unit 136 guides the photopolymer plate 102 to the photopolymer plate conveying unit 130 (shown by the solid line in FIG. 2).
As a result, the photopolymer plate 102 taken out from the magazine 208 is sent out to the surface plate 110 (see FIG. 1A) by the photopolymer plate transfer unit 130 in a substantially horizontal transfer state.

As shown in FIG. 1A, the surface plate 110
The height of the upper surface is lower than the horizontal conveying height by the photopolymer plate conveying unit 130, and there is a slight interval in the conveying direction. For this reason, the photopolymer plate 102 delivered from the photopolymer plate transport unit 130 has a platen 110 with the tip thereof slightly hanging down.
It lands on the upper side, and the rear end portion in the transport direction is located on the front side of the surface plate 110. On this side, the surface plate 11
A moving body 152 that can move toward and away from 0 is provided.

The moving body 152 is provided with a temporary support plate, a pressing plate, a puncher, etc. (all are not shown), and the photopolymer plate 10 sent to the surface plate 110.
2 is prevented from hanging down by the temporary support plate of these.

A pressing plate (not shown) provided on the moving body 152 presses the rear end portion of the photopolymer plate 102 to eliminate the skew of the photopolymer plate 102 and to set a predetermined conveyance direction reference. Send to the position. The reference position is a state in which the rear end portion of the photopolymer plate 102 in the transport direction slightly protrudes from the surface plate 110.

At this reference position, the photopolymer plate 10
Sensors (not shown) are provided at a plurality of positions including both corners of the rear end portion of the conveyance direction 2 and these sensors detect the rear end portion of the photopolymer plate 102 in the conveyance direction to stop the pressing by the pressing plate. . Further, these sensors are also applied to position detection of the photopolymer plate 102 in the conveyance width direction. That is, by moving the surface plate 110 in the conveyance width direction, the corners of the photopolymer plate 102 are aligned with the sensors, and this is fixed.
It is designed to be registered as the initial position of.

The position of the photopolymer plate 102 moved to the initial position is determined relative to the scanning exposure start position in the exposure unit 112, and the photopolymer plate 10
In this state, 2 is sucked and held by a negative pressure supplied to a suction groove (not shown) provided on the surface plate 110. Surface plate 110
The photopolymer plate 102 adsorbed and held on the upper side is provided with punch holes by a puncher provided on the moving body 152.

The platen 110 is a first position which is an initial position for receiving the photopolymer plate 102 from the photopolymer plate conveying section 130 (see the solid line position in FIG. 1A).
And a second position housed in the exposure unit 112 (see FIG. 1A).
(Refer to the position of the imaginary line) and can be reciprocally moved at a constant speed (common to the movement in the conveyance width direction for positioning).

The exposure unit 112 is provided with a scanning unit 164 above the transport path of the surface plate 110, and a laser beam whose lighting is controlled according to an image signal is mainly scanned (surface plate 1).
10 is a direction orthogonal to the transport direction). On the other hand, the outward transportation of the surface plate 110 is a sub-scanning movement,
As a result, an image is recorded on the photopolymer plate 102 on the surface plate 110 during the forward transportation to the exposure unit 112, and is returned to the original position by the backward transportation. The suction holding of the photopolymer plate 102 on the surface plate 110 that has returned to the original position is released.

Surface plate 1 on which an image is recorded and returned to the initial position
10, the discharging mechanism unit 166, which was on standby at the rear end side of the photopolymer plate 102 in the conveying direction by the photopolymer plate conveying unit 130, passes above the surface plate 110 and passes the front end of the photopolymer plate 102 in the conveying direction. Move to the department.

A hook portion 166A for supporting a rear end portion of the photopolymer plate 102 in the conveying direction is formed in the discharging mechanism portion 166, and the rear end portion of the photopolymer plate 102 protruding from the surface plate 110 is moved by a moving body. The temporary support plate provided at 152 lifts the discharge mechanism 166.
By moving the photopolymer plate 102 in the conveying direction of the photopolymer plate 102,
As the discharging mechanism 166 is hooked on the tray, it is conveyed to the downstream side of the surface plate 110. On this downstream side,
A buffer unit 114 is provided, and the automatic developing device 11 is further provided.
6, the photopolymer plate 102 is smoothly sent out while the buffer 114 absorbs the difference between the discharging speed of the discharging mechanism 166 and the conveying speed of the automatic developing device 116.

Here, as shown in FIGS. 1 (A), 1 (B) and 3, the first position at both end positions of the conveying path of the surface plate 110.
A plurality of fans 250 as air blowing means are arranged in the direction orthogonal to the surface plate transport path at an intermediate portion between the position and the second position.

A common duct 252 is attached to each exhaust port of the plurality of fans 250. The outlet of the duct 252 extends in the direction of the transport path of the surface plate 110, and the tip of the outlet is inclined in the first direction of the surface plate 110 at a predetermined inclination angle. That is, when the fan 250 is driven, the air blown from the duct 252 is blown at a predetermined angle to the surface of the photopolymer plate 102 positioned on the surface plate 110.

When the air is blown at the predetermined angle, the dust 254 on the photopolymer plate 102 is blown away by the force of the air, and the dust 254 can be removed when reaching the exposure unit 112.

By the way, some of the dust 254 is simply placed on the photopolymer plate 102, and some of the dust 254 has an adhesive force and is firmly attached. In addition, dust 2 which is charged by static electricity and adheres due to the charge
There are also 54.

The dust 254 thus strongly adhered
Can be left on the photopolymer plate 102 still by being simply blown off.

Therefore, in this embodiment, the duct 252 is used.
A brush 256 as a blow-off trigger means is arranged on the upstream side in the direction in which the surface plate 110 moves from the first position to the second position with respect to the blow-out port.

The brush 256 is composed of a plurality of bristle materials 258 whose tips contact the surface of the photopolymer plate 102, and a rod-shaped handle 260 having a supporting surface 260A for supporting the base portion of the bristle materials 258. ing. The handle 260 is fixed to the side surface of the duct 252, is bent in the middle portion, and the support surface 260A has the support surface 260A.
It is arranged so as to face the surface of No. 2. The contact pressure of the bristle material 258 to the photopolymer plate 102 is small,
The photopolymer plate 102 cannot be scratched.

Therefore, the photopolymer plate 1 placed on the surface plate 110 and moving from the first position to the second position.
The surface of No. 02 first comes into contact with the tip of the bristle material 258, and then air is blown.

That is, by contacting the bristle material 258,
The dust strongly adhered to the surface of the photopolymer plate 102 is in the same state as the so-called dust that is simply mounted, and can be blown off with air.

The operation of this embodiment will be described below.

In the automatic exposure apparatus 100, image exposure to the photopolymer plate 102 is instructed with the carriage 200 having the magazine 208 containing the photopolymer plate 102 mounted in the plate accommodating section 104. Then, the photopolymer plate 102 is taken out.

At this time, when the interleaf sheet exists in the uppermost layer, the interleaf sheet 11 is transferred from the common transport section 128 to the interleaf sheet transport section 134.
The transport path is switched by the switching transport unit 136 so as to transport 8.

The interleaving paper delivered to the common transport section 128 is
Shared transport unit 128 while being pulled out from the magazine 208
Is sent to the interleaving paper transport unit 134 through the switching transport unit 136 and is stored in the interleaf paper storage box 132.

Photopolymer plate 10 from magazine 208
When the interleaving paper 118 covering 2 is taken out, the photopolymer plate 102 is taken out subsequently. That is, the uppermost layer of the magazine 208 is the photopolymer plate 102, and when the photopolymer plate 102 is taken out, the switching conveyance unit 36 is switched and a conveyance path from the common conveyance unit 128 to the photopolymer plate conveyance unit 130 is formed. To be done.

The photopolymer plate 102 taken out from the magazine 208 is slid down onto the surface plate 110 through a predetermined conveying path, then positioned at a predetermined position, and held on the surface plate 110 in a positioned state.

After that, the surface plate 110 starts to move to the exposure unit 112, and as a result, reciprocates once between the initial position (first position) and the exposure unit 112 (second position). That is, at the initial position after one round trip, the platen 11
The exposure of the photopolymer plate 102 above 0 is completed.

Photopolymer plate 10 after this exposure
Holding of No. 2 is released from the surface plate 110 and sent to the next process. In the next step, the buffer unit 11
4, the developing device 116 is installed so that the photopolymer plate 102 can automatically perform everything from taking out from the magazine 208 to developing processing.

At the time of exposure by the exposure unit 112, dust 254 may be present on the surface of the photopolymer plate 102 positioned on the surface plate 110. When exposure is performed by the exposure unit 112 in the presence of the dust 254, light during scanning is blocked, which causes uneven exposure. Therefore, from the first position of the surface plate 110 to the second position
In the middle of the conveying path to the position of
Are arranged in a direction orthogonal to the conveying direction of the air, and air having a predetermined pressure and a predetermined flow rate is blown from the blowout port of the duct 252 and blown onto the surface of the photopolymer plate 102. Since this air is blown at a predetermined angle to the surface of the photopolymer plate 102 by the shape of the duct 252, the dust 254 on the photopolymer plate 102 is simply blown off reliably.

However, some dust has an adhesive force. Such sticky dust 254 may remain on the surface of the photopolymer plate 102 without being blown away by the air.

Some of the dust 254 is charged by static electricity and is attached to the photopolymer plate 102 by the charge. Dust 25 having such an electric charge
No. 4 may not be blown away by the air and may remain on the surface of the photopolymer plate 102.

Therefore, in this embodiment, the duct 252 is used.
The brush 256 is arranged on the upstream side during the movement of the surface plate 110 from the first position to the second position in
Hair material 2 attached to the support surface 260A of the handle 260 of FIG.
The tip of 58 was brought into contact with the surface of the photopolymer plate 102 on the surface plate 110.

Therefore, the photopolymer plate 102 comes into contact with the bristle material 258 before the air is blown, and the dust 254 firmly attached thereto receives the force of being scraped off by the bristle material 258. Therefore, the dust 254 has a weaker holding force with respect to the photopolymer plate 102, and is subsequently blown with air. Therefore, like the dust 254 that is simply blown off, the photopolymer plate 1 by air is blown.
02 can be removed from the surface.

As a result, the surface of the photopolymer plate 102 reaching the exposure section 112 is almost free of dust 254, and uneven exposure can be eliminated.

As described above, according to the present embodiment, when the photopolymer plate 102 is positioned on the surface plate 110 and conveyed to the exposure section 112 while maintaining its flatness, before blowing the air for blowing away the dust 254. To
By rubbing the bristle material 258 of the brush 256 with a comparatively weak pressure, the dust 254 strongly adhered to the surface of the photopolymer plate 102 by adhesive force or static electricity is simply deposited on the surface of the photopolymer plate 102. Dust 254
It can be in a state equivalent to, and the effect of blowing off with air can be greatly enhanced.

As shown in FIG. 4, the brush 256 applied in the present embodiment is further provided with the duct 252 on the upstream side during conveyance from the first position to the second position on the surface plate 110. It is also possible to arrange one with the air outlet being bifurcated. That is, by disposing the brush 256 between the pair of air outlets, most of the dust 254 can be removed by only blowing the air first. Therefore, after that, with the brush 256, only the dust 254 that strongly adheres is removed. Therefore, maintenance such as cleaning of the brush 256 can be reduced.

Further, in the present embodiment, the brush 256 having a structure in which the linear bristle material 258 is planted on the support surface 260A of the flat handle 260 is applied as the blow-off trigger means, but as shown in FIG. , A brush roller 2 having a bristle material 264 protruding in the radial direction on the circumferential surface of the rotating shaft 262.
66 may be used. In this case, the tip of the bristle material 264 provided on the brush roller 266 is in contact with the surface of the photopolymer plate 102 and may be rotatable according to the transport force of the surface plate 110, or the brush roller 266 may be separately rotated. A drive unit may be provided to rotate the platen 110 in the direction opposite to the direction in which the platen 110 is conveyed.

Further, in this embodiment, mechanical means, ie, the brush 256, is used as the blow-off trigger means.
The bristles 258 and 264 of the brush roller 266 are brought into contact with the photopolymer plate 102 to remove dust that adheres firmly. However, as shown in FIG. 6, the air flow rate (air volume) is periodically changed. May be changed to increase the influence on the firmly attached dust. In this case, since the photopolymer plate 102 is in a non-contact state, it is not necessary to consider damage to the photopolymer plate 102 at all.

[0070]

As described above, according to the present invention, it is possible to reliably remove dust on the surface of the printing plate by blowing air onto the printing plate, and it is possible to suppress unevenness of exposure during exposure. Have an effect.

[Brief description of drawings]

FIG. 1A is a schematic configuration diagram showing an automatic exposure apparatus applied to the present embodiment, and FIG. 1B is an enlarged perspective view of a flow path to an exposure unit on a surface plate.

FIG. 2 is a schematic configuration diagram showing a main part of an automatic exposure apparatus provided with a single-wafer part to which the present invention is applied.

FIG. 3 is a side view showing an arrangement state of fans and brushes provided in the conveyance path of the platen.

FIG. 4 is a side view showing a modified example of the arrangement state of the fan and the brush according to the present embodiment.

FIG. 5 is a side view showing a modified example of the brush according to the present embodiment.

FIG. 6 is a time-air volume characteristic diagram in the case of performing periodic change control of the air volume as the blow-off trigger means of the present invention.

[Explanation of symbols]

100 automatic exposure equipment 102 Photopolymer plate (printing plate) 104 plate storage 106 leaf 110 surface plate 112 Exposure unit 118 interleaf paper 200 dolly 208 magazine 250 fan (air blow means) 252 duct (air blow means) 254 dust 256 brushes (blow-off trigger means) 258 hair material (blow-off trigger means) 266 rotating brush (blow-off trigger means)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaya Ichihashi             798 Miyadai, Kaisei-cho, Ashigarakami-gun, Kanagawa Prefecture             Shishi Film Co., Ltd. (72) Inventor Yoshinori Kawamura             798 Miyadai, Kaisei-cho, Ashigarakami-gun, Kanagawa Prefecture             Shishi Film Co., Ltd. F term (reference) 2H084 AA30 AA40 AE05 CC05                 2H097 AB05 BA04 CA17 DB03 DB07                       KA28 LA03

Claims (4)

[Claims] 1. A platen capable of moving a printing plate from a first position to a second position along a predetermined transport path while maintaining the flatness of the printing plate in a predetermined position. An automatic printing plate exposure apparatus, which is capable of exposing an image by irradiating the surface of the printing plate positioned at the first position with light based on image information at the second position. From the position of No. 2 to the second position, and an air blowing unit for blowing air of a predetermined pressure and a predetermined flow rate toward the surface of the printing plate positioned on the surface plate, and dust on the printing plate. On the other hand, a printing plate automatic exposure device comprising: a blow-off trigger means for changing to a state in which it can be blown away by the air of the air blow means. 2. A set of bristles in which the blow-off trigger means is provided in the vicinity of an air outlet of the air blow means and on the upstream side of the conveyance, and a tip portion of which is in contact with the surface of the printing plate at a predetermined pressure. The printing plate automatic exposure device according to claim 1, which is a body. 3. The printing plate according to claim 2, wherein the aggregate of the bristles is a brush roller provided with a plurality of bristles so as to protrude in the radial direction from the peripheral surface of the rotating shaft. Automatic exposure device. 4. The automatic printing plate exposure apparatus according to claim 1, wherein the blow-off trigger means controls the periodic change of the air pressure and flow rate by the air blow means.