JP2000056400A - Plotting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plotting device by which the contamination of an exposure optical system caused by gas generated in the case of exposure is prevented. SOLUTION: An exposing head 8 is provided with a gas diffusing and sucking unit 80 to which an objective lens 86 is attached. An air blowoff port 82 and a gas sucking port 83 are provided on the unit 80. The port 82 is arranged on an upstream side in the rotating direction of a recording drum 1, and nearly faces the irradiated position of laser light on the drum 1 by the lens 86. The port 83 is arranged on the downstream side of the rotating direction of the drum 1, and nearly faces the irradiated position of the laser light on the drum 1 by the lens 86. In the case of exposure, air is jetted to a printing plate 100 on the drum 1 from the port 82 of the unit 80, and the gas diffused by the air is sucked from the port 83 of the gas diffusing and sucking block 80 with the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a drawing apparatus for drawing on a photosensitive material mounted on an outer peripheral surface of a drum.

[0002]

2. Description of the Related Art A drawing apparatus is used to perform drawing by irradiating various photosensitive materials with light. In a drum type drawing apparatus, a photosensitive material is mounted on a recording drum rotatable in a main scanning direction, and an exposure head equipped with a laser diode is moved from the exposure head while moving in a sub-scanning direction parallel to the rotation axis of the recording drum. Drawing is performed by irradiating the photosensitive material with a laser beam.

[0003]

However, in the above-described drawing apparatus, components of the photosensitive material evaporate as gas from the surface of the photosensitive material exposed by the laser beam. The gas generated from the photosensitive material enters the exposure head and contaminates the inside of the exposure head. Further, when the gas generated from the photosensitive material adheres to the objective lens at the emission port of the laser beam of the exposure head, the surface of the objective lens becomes cloudy with the gas, and the quality of an image formed on the photosensitive material deteriorates.

It is an object of the present invention to provide a drawing apparatus in which contamination of an exposure optical system due to gas generated during exposure of a photosensitive material is prevented.

[0005]

Means for Solving the Problems and Effects of the Invention (1)
A drawing apparatus according to a first invention is a drawing apparatus for drawing on a photosensitive material, comprising: a cylindrical drum having a rotation axis and having a photosensitive material mounted on an outer peripheral surface; A rotation drive unit for rotating around a rotation axis, and a drawing unit for drawing on a printing plate mounted on the outer peripheral surface of the drum, wherein the drawing unit is a light irradiation unit that irradiates light to a photosensitive material on the drum. A blowing means for blowing a predetermined gas to diffuse a gas generated by light irradiation by the light irradiating means; and a suction means for sucking a gas diffused by the predetermined gas.

In the drawing apparatus according to the present invention, the drum on which the photosensitive material is mounted on the outer peripheral surface is driven to rotate around the rotation axis by the rotation driving means. The photosensitive material on the rotating drum is irradiated with light by the light irradiating means of the drawing means, whereby drawing is performed on the photosensitive material.

At this time, a predetermined gas is blown by the blowing means of the drawing means, and the gas generated from the photosensitive material by light irradiation is diffused by the gas. The diffused gas is sucked by the suction means.

Therefore, contamination of the exposure optical system due to gas generated during exposure of the photosensitive material is prevented, and deterioration of image quality due to contamination of the exposure optical system is prevented.

(2) Second invention A drawing apparatus according to a second invention is the drawing apparatus according to the first invention, wherein the blowing means is arranged upstream of the light irradiation means in the rotation direction of the drum. The suction means has a suction port arranged downstream of the light irradiation means in the rotation direction of the drum.

In this case, a predetermined gas is blown out from a first blowout port located upstream of the light irradiating means in the rotation direction of the drum, and the gas generated by the light irradiation by the light irradiating means is turned into a predetermined gas. Is diffused downstream. The diffused gas is sucked from a suction port arranged downstream of the light irradiation means in the rotation direction of the drum.
Thereby, the gas generated by the light irradiation by the light irradiation means is sufficiently sucked. Therefore, deterioration of image quality due to contamination of the exposure optical system is sufficiently prevented.

(3) Third invention The drawing apparatus according to the third invention is the drawing apparatus according to the second invention, wherein the blowing means irradiates the photosensitive material on the drum with light by the light irradiation means. A predetermined gas is blown out toward the position.

In this case, the gas generated at the light irradiation position of the photosensitive material on the drum by the light irradiation means can be sufficiently diffused.

(4) Fourth Invention In a fourth aspect of the present invention, in the drawing apparatus according to the second or third aspect, the blowing means is located downstream of the light irradiation means in the rotation direction of the drum. It further has a second outlet arranged on the side.

In this case, a predetermined gas is blown from a second blowout port located downstream of the light irradiation means in the rotation direction of the drum. This prevents the gas diffused by the predetermined gas blown out from the first blowout opening from being blown downstream from the suction opening. Therefore, the gas diffused by the predetermined gas can be reliably sucked from the suction port.

(5) Fifth Invention In the drawing apparatus according to the fifth invention, in the configuration of the drawing apparatus according to the first or second invention, the blowing means is arranged to block the light exit of the light irradiation means. A predetermined gas is blown out of the device.

In this case, by blowing a predetermined gas in a direction blocking the light emission port of the light irradiation means, a gas flow is formed on the surface of the light emission port of the light irradiation means. As a result, the gas generated by the light irradiation is blocked by the gas flow, and is reliably prevented from entering the light emission port of the light irradiation means.

(6) Sixth invention A drawing apparatus according to a sixth invention is the drawing apparatus according to the first invention, wherein the blowing means surrounds the periphery of the light exit of the light irradiation means. The suction means has a plurality of outlets arranged, and the suction means has a suction port arranged downstream of the light irradiation means in the rotation direction of the drum.

In this case, a predetermined gas is blown out from a plurality of blowout ports arranged so as to surround the light outlet of the light irradiation means. Thereby, the periphery of the light irradiation means is surrounded by the flow of the predetermined gas. Further, the gas diffused by the gas is sucked from a suction port arranged downstream of the light irradiation means in the rotation direction of the drum. As a result, it is possible to reliably prevent the gas generated by the light irradiation from contaminating the light emission port of the light irradiation means.

(7) Seventh invention The drawing apparatus according to the seventh invention is the drawing apparatus according to any one of the first to sixth inventions, wherein the blowing amount control means controls the blowing amount of the blowing means. Is further provided.

In this case, the blowing amount of the blowing means can be adjusted to an optimum flow rate according to the number of rotations of the drum and the type of photosensitive material. Thereby, the gas generated by the light irradiation can be sufficiently diffused.

(8) Eighth Invention The drawing apparatus according to the eighth invention is the drawing apparatus according to any one of the first to seventh inventions, wherein the suction amount control means controls the suction amount of the suction means. Is further provided.

In this case, the suction amount of the suction means can be adjusted to an optimum flow rate according to the number of rotations of the drum and the type of the photosensitive material. Thereby, the diffused gas can be sufficiently sucked.

[0023]

FIG. 1 is a schematic side view of a drawing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic front view of the drawing apparatus of FIG.

In FIGS. 1 and 2, the drawing apparatus includes a cylindrical recording drum 1. The recording drum 1 is rotationally driven by the rotation driving device 4 around the rotation axis 1a in the direction of arrow A (main scanning direction). On the outer peripheral surface of the recording drum 1, a printing plate 100 made of aluminum is mounted as a photosensitive material. One end of the printing plate 100 is fixed to the outer peripheral surface of the recording drum 1 by a plurality of front end clamps 2, and the other end of the printing plate 100 is fixed to the outer peripheral surface of the recording drum 1 by a plurality of rear end clamps 3.

An exposure head 8 having a plurality of laser diodes is provided in front of the recording drum 1. The exposure head 8 is movably attached to a guide 82,
It moves in the direction of arrow B (sub-scanning direction) in synchronization with the rotation of the recording drum 1.

The plurality of laser diodes of the exposure head 8 are driven by a laser diode drive circuit section 110.

The image signal generating circuit 130 generates an image signal and outputs the image signal to the laser diode driving circuit 110
Give to. The laser diode drive circuit section 110 drives a plurality of laser diodes of the exposure head 8 in response to an image signal. Thereby, the printing plate 100 is irradiated with the laser beam by the exposure head 8.

As shown in FIG. 1, a clamp driving device 5 is provided behind the recording drum 1. The clamp driving device 5 is used to mount the rear end clamp 3 on the recording drum 1, remove the rear end clamp 3 from the recording drum 1, and release the front end clamp 2 on the recording drum 1.

The clamp driving device 5 has a pair of clamp arms 6 which can swing in the direction of arrow C. A drive bar 60 is attached between the pair of clamp arms 6, and a plurality of first drive devices 7 are attached to the drive bar 60. As shown in FIG. 1, the first driving device 7 has a driving pin 75 for fixing and releasing the rear end clamp 3, two holding pins 76 for holding the rear end clamp 3, and mounting of the printing plate 100. A release pin 78 for releasing the tip clamp 2 at times is provided. In addition, the clamp driving device 5
Includes a second driving device (not shown) that releases the tip clamp 2 when the printing plate 100 is removed.

As shown in FIG. 1, a transport unit 9 is arranged above the recording drum 1 so as to be swingable in the direction of arrow R. The transport unit 9 is provided with a first
And a second transport path 92 for unloading the printing plate. When the printing plate 100 is carried in, the first
The printing plate 100 is supplied onto the recording drum 1 through the conveyance path 91 of the printer. When the printing plate 100 is carried out, the recording drum 1
The printing plate 100 removed from the transport unit 9 is carried out through the second transport path 92 of the transport unit 9 to the outside.

At the leading end of the transport unit 9, a printing plate 100
Is provided with a punching device 10 for making a positioning hole. Before the printing plate 100 is supplied onto the recording drum 1,
The sheet is supplied to the punching device 10 through the first transfer path 91 of the transfer unit 9, and a positioning hole is formed in the peripheral portion of the printing plate 100. The positioning holes of the printing plate 100 engage with positioning pins (not shown) provided on the outer peripheral surface of the recording drum 1.

The control unit 600 shown in FIG. 1 comprises a CPU (Central Processing Unit), an input / output interface and the like, and controls each unit of the drawing apparatus. The control unit 600 includes an operation panel 7 for inputting various information and various instructions by an operator.
00 is connected.

FIG. 3 is a perspective view of the drawing head 8, and FIG.
4 is a detailed perspective view of a zoom lens system of the drawing head 8 in FIG.

Here, two mutually orthogonal directions in a horizontal plane are defined as an X direction and a Z direction, respectively, and a vertical direction is defined as a Y direction.

In FIG. 3, a laser diode array 802, a plurality of cylindrical lenses 803, a slit plate 804, a radiation mirror 805, a three-dimensional projection lens 806, a lens 807, a folding mirror 80 are provided on a main base 801.
8, a zoom lens system 810 and a gas diffusion suction unit 80 are arranged.

On the side of the main base 801 is attached a storage case 830 for storing a substrate on which a laser diode driver and the like are mounted.

The laser diode array 802 has a plurality of laser diodes, and a collimator lens is mounted at the tip of each laser diode. The collimating lens aligns the laser light emitted from the laser diode in parallel in the Y direction.

The plurality of cylindrical lenses 803 extend in the Y direction and are arranged in parallel in the X direction. These cylindrical lenses 803 align the laser beams emitted from the laser diode array 802 in parallel in the X direction.

The slit plate 804 shapes the beam of the laser beam that has passed through the cylindrical lens 803. The laser light that has passed through the slit plate 804 is reflected by the radiation plane mirror 805 and enters the stereoscopic projection lens 806. The radiation surface mirror 805 and the stereoscopic projection lens 806 constitute a first-stage reduction optical system.

The laser light transmitted through the three-dimensional projection lens 806 further transmits through the lens 807 and returns to the turning mirror 80.
The light is reflected by 8 and enters the zoom lens system 810.
The zoom lens system 810 includes a motor for focusing and a motor for zooming. The lens 807, the folding mirror 808, and the zoom lens system 810 constitute a second-stage reduction optical system.

The zoom lens system 810 focuses the laser beam on the plate 100 on the recording drum 1 through an objective lens provided in the gas diffusion suction unit 80.

In FIG. 4, a large base 811 is fixed on a main base 801 in FIG. In addition, small base 8
Reference numeral 18 is provided on the main base 801 so as to be movable in the X direction.

The large base 811 has a focus motor 8
12 are provided. A screw shaft (not shown) is provided on the rotation shaft of the focus motor 812 via a coupling 813.
Is connected, and a nut 814 is screwed to the screw shaft.
The screw shaft is held by a bearing 815. When the focus motor 812 rotates, the nut 814 moves in the X direction.

The nut 814 is connected to the small base 818. The small base 818 is provided so as to be movable in the X direction by a focus motor 812 during focusing.

A sensor blade 816 is attached to a rotation shaft of the focus motor 812. A fixed sensor 817 that detects the position of the origin and the end of the small base 818 by detecting the position of the sensor blade 816 is attached to the large base 811. The fixed sensor 817 is used for managing the position of the small base 811 by pulse control.

On the small base 818, the first support frame 821
The zoom lens 820 is supported by the second support frame 822. On the small base 818, a zoom motor (not shown) is provided.

The zoom lens 820 includes the sensor blade 82
3 is attached. The fixed sensor 824 is fixed to the second support frame 822 via a connecting portion 825.
The fixed sensor 824 detects the position of the origin and the end point of the zoom lens 820 by detecting the position of the sensor blade 823. The fixed sensor 824 is used for managing the zoom position by pulse control.

FIG. 5 shows a gas diffusion suction unit 80 of the exposure head 8, (a) is a perspective view, (b) is a front view,
(C) is a longitudinal sectional view.

In FIG. 5, the gas diffusion suction unit 80
Is composed of an upper block 80a and a lower block 80b. Upper block 80a and lower block 80
A circular lens hole 80c is provided at the connection portion with b. The objective lens 86 is mounted in the lens hole 80c.

Upper block 80a and lower block 80b
And can be easily separated. Therefore, the objective lens 86
Can be easily adjusted, cleaned and replaced.

A plurality of air outlets 82 are provided on the front surface of the lower block 80b. Air outlet 8
2 communicates with an air supply port 84 provided on the side surface of the lower block 80b. These air outlets 82
Is disposed on the upstream side in the rotation direction of the recording drum 1 (in the direction of arrow A), and substantially faces the irradiation position of the laser beam on the recording drum 1 by the objective lens 86. Thereby, the gas generated by the irradiation of the laser beam is diffused by air (air).

A gas suction port 83 is provided on the front surface of the upper block 80a. The gas suction port 83 is arranged on the downstream side in the rotation direction of the recording drum 1 (direction of the arrow A), and faces almost the irradiation position of the laser beam on the recording drum 1 by the objective lens 86. The gas suction port 83 communicates with a gas discharge port 85 provided on the upper surface of the upper block 80a. Thereby, the gas generated by the irradiation of the laser beam is sucked together with the air.

FIG. 6 is a block diagram showing an air supply system and an exhaust system of the gas diffusion suction unit 80.

In FIG. 6, the gas diffusion suction unit 80
The air supply port 84 is connected to a compressor 850 via a filter 851. Compressor 85
The pressure reducing valve 852 is connected to the downstream side of 0.

Gas outlet 8 of gas diffusion suction unit 80
5 is an air blower (blower) 854 via a filter 853
It is connected to the. A pressure reducing valve 8 is provided upstream of the blower 854.
55 are connected.

Clean air is supplied from the compressor 850 to the air supply port 84 of the gas diffusion suction unit 80 via the filter 851. Thereby, the gas diffusion suction unit 8
Air is blown from the zero air outlet 82 onto the outer peripheral surface of the recording drum 1. The gas generated during the exposure is sucked together with the air from the gas suction port 83 of the gas diffusion suction unit 80, and sent from the gas discharge port 85 to the blower 854 through the filter 853.

The pressure reducing valves 852 and 855 are controlled by the controller 600. By controlling the pressure reducing valve 852, the flow rate of the air blown out from the air outlet 82 of the gas diffusion suction unit 80 can be adjusted. Further, by controlling the pressure reducing valve 855, the flow rates of the gas and the air sucked from the gas suction port 83 of the gas diffusion suction unit 80 can be adjusted.

Thus, the amount of air blown from the air outlet 82 of the gas diffusion and suction unit 80 and the amount of gas and air sucked from the gas suction port 83 according to the number of rotations of the recording drum 1 and the type of the plate 100. Can be adjusted to optimal flow rates.

Specifically, the air blowing amount and the gas / air suction amount are increased / decreased in proportion to the rotation speed of the recording drum 1.

Alternatively, in order to improve the drawing efficiency, the light amount of each of the plurality of laser diodes mounted on the laser diode array 802 may be increased or decreased, or the number of laser diodes to be operated may be adjusted. Also in such a case, since the amount of gas generated from the printing plate 100 changes,
The air blowing amount and the gas / air suction amount may be adjusted accordingly.

Alternatively, the air blowing amount and the gas / air suction amount may be adjusted according to the image drawn on the printing plate 100. That is, it is considered that the gas generation amount changes according to the type of the image formed on the printing plate 100 (whether the image requires a large amount of irradiation light per unit time from the laser diode or not). .

FIG. 7 is a side view of the recording drum 1 and the exposure head 8 during exposure. In FIG. 7, a printing plate 100 is mounted on the outer peripheral surface of the recording drum 1, the front end of the printing plate 100 is fixed by a front end clamp 2, and the rear end of the printing plate 100 is fixed by a rear end clamp 3. In this state, the recording drum 1 rotates in the direction of arrow A.

The exposure head 8 irradiates a laser beam to the plate 100 on the rotating recording drum 1 through an objective lens 86. Gas is generated from the plate 100 by exposure of the plate 100. At this time, the air blown from the air outlet 82 of the gas diffusion suction unit 80 is blown from the upstream side in the rotation direction of the recording drum 1 to a position near the irradiation position of the laser beam. The gas generated from the printing plate 100 by the irradiation of the laser beam is diffused by air and blown off mainly to the downstream side in the rotation direction of the recording drum 1. The gas diffused by the air is supplied to the gas suction port 8 of the gas diffusion suction unit 80.
3 is sucked together with air.

As described above, in the drawing apparatus of the present embodiment, the gas generated during the exposure of the printing plate 100 is diffused by the air blown out from the air blowout port 82 of the gas diffusion suction unit 80, and the diffused air is diffused by the gas diffusion. Since the gas is sucked from the gas suction port 83 of the suction unit 80, the gas enters the exposure head 8 and contaminates the inside of the exposure head 8, or the gas adheres to the objective lens 86 and the objective lens 86
Is prevented from fogging. Therefore, deterioration of the image quality due to contamination of the exposure optical system by the gas is prevented.

Further, the gas is diffused by the air blown out from the air blowout opening 82 of the gas diffusion suction unit 80, and the diffused gas is sucked through the gas suction opening 83. Even when the distance W from the printing plate 100 is large, contamination of the exposure optical system by the gas is prevented.

FIG. 8 is a sectional view showing another example of the gas diffusion suction unit 80. The gas diffusion suction unit 80 of FIG.
Then, in the rotation direction of the recording drum 1, the gas suction port 83
Further, an air outlet 87 is provided on the downstream side. The air outlet 87 faces slightly downstream from the irradiation position of the laser beam on the recording drum 1 by the objective lens 86. In this example, the air outlet 87 corresponds to a second outlet. The gas diffusion suction unit 80 of FIG.
The configuration of the other part is the gas diffusion suction unit 80 of FIG.
The configuration is the same as that described above.

According to the gas diffusion suction unit 80 shown in FIG. 8, the gas diffused by the air blown from the air outlet 82 to the recording drum 1 is prevented from being blown downstream from the gas suction port 83. This ensures that the gas diffused by the air is sucked from the gas suction port 83.

FIG. 9 is a sectional view showing still another example of the gas diffusion suction unit. The gas diffusion suction unit 8 of FIG.
At 0, the air outlet 82a provided in the lower block 80b faces in a direction substantially parallel to the surface of the objective lens 86. In this example, the air outlets 82 and 82a correspond to a first outlet. The configuration of other parts of the gas diffusion suction unit 80 in FIG. 9 is the same as the configuration of the gas diffusion suction unit 80 in FIG.

According to the gas diffusion suction unit 80 shown in FIG. 9, the air blown out from the air blowout port 82a flows along the surface of the objective lens 86 and is sucked through the gas suction port 83. Thus, an air curtain is formed on the surface of the objective lens 86. As a result, the gas generated by the laser beam irradiation is blocked by the air curtain, and the objective lens 86
Is reliably prevented from adhering to the surface.

FIG. 10 is a perspective view showing still another example of the gas diffusion suction unit 80. In the gas diffusion suction unit 80 of FIG. 10, a plurality of air outlets 88 are provided around the lens hole 80c. The plurality of air outlets 88 face almost the irradiation position of the laser beam on the recording drum 1 by the objective lens 86. In this example, the air outlet 88 corresponds to a plurality of outlets. The configuration of other parts of the gas diffusion suction unit 80 in FIG. 10 is the same as the configuration of the gas diffusion suction unit 80 in FIG.

According to the gas diffusion suction unit 80 shown in FIG. 10, air is blown from the plurality of air outlets 88 to a position near the laser beam irradiation position on the recording drum 1. Thereby, the periphery of the objective lens 86 is surrounded by the flow of air. As a result, the gas generated by the laser beam irradiation is reliably prevented from adhering to the objective lens 86.

The number and positions of the air outlets and gas suction ports provided in the gas diffusion suction unit 80 are not limited to those in the above-described embodiment, and the contamination of the exposure head 8 and the objective lens 86 by gas generated during exposure can be sufficiently reduced. The number and position of the air outlets and air suction ports are appropriately selected so as to prevent the occurrence.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a drawing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic front view of the drawing apparatus of FIG. 1;

FIG. 3 is a perspective view of an exposure head in the drawing apparatus of FIG. 1;

FIG. 4 is a detailed perspective view of a zoom lens system of the exposure head of FIG.

FIG. 5 is a perspective view, a front view, and a vertical sectional view of a gas diffusion suction unit in the exposure head of FIG. 3;

6 is a block diagram showing an air supply system and an exhaust system of the gas diffusion suction unit of FIG.

FIG. 7 is a side view of a recording drum and an exposure head during exposure.

FIG. 8 is a sectional view showing another example of the gas diffusion suction unit.

FIG. 9 is a sectional view showing still another example of the gas diffusion suction unit.

FIG. 10 is a perspective view showing still another example of the gas diffusion suction unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording drum 4 Rotation drive device 8 Exposure head 80 Gas diffusion suction unit 80a Upper block 80b Lower block 80c Lens hole 82, 82a, 87, 88 Air blowout port 83 Gas suction port 84 Air supply port 85 Gas discharge port 86 Objective lens 100 Plate 600 Control unit 802 Laser diode array 850 Compressor 851,853 Filter 852,855 Pressure reducing valve 854 Blower

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H084 AA30 AE05 BB02 2H106 AA02 AA41 AA44 AA71 AB75 2H109 AA12 AA29 AA94 CA21

Claims (8)

[Claims] 1. A drawing apparatus for drawing on a photosensitive material, comprising: a cylindrical drum having a rotating shaft, on which a photosensitive material is mounted on an outer peripheral surface; and rotating the drum around the rotating shaft. A rotation drive unit; a drawing unit configured to draw on a printing plate mounted on an outer peripheral surface of the drum; the drawing unit: a light irradiation unit configured to irradiate a photosensitive material on the drum with light; A drawing apparatus, comprising: a blowing unit for blowing a predetermined gas to diffuse a gas generated by light irradiation by the unit; and a suction unit for suctioning a gas diffused by the predetermined gas. 2. The method according to claim 1, wherein the blowing unit has a first blowing port disposed upstream of the light irradiating unit in the rotation direction of the drum, and the suction unit includes the first blowing port in the rotation direction of the drum. The drawing apparatus according to claim 1, further comprising a suction port disposed downstream of the irradiation unit. 3. The drawing apparatus according to claim 2, wherein the blowing unit blows the predetermined gas toward a position where the light irradiation unit irradiates the photosensitive material on the drum with light. 4. The drawing apparatus according to claim 2, wherein the blowing unit further includes a second blowing port disposed downstream of the light irradiation unit in a rotation direction of the drum. . 5. The drawing apparatus according to claim 1, wherein the blowing unit blows out the predetermined gas in a direction that blocks a light emission port of the light irradiation unit. 6. The light emitting means has a plurality of air outlets arranged so as to surround a light emission port of the light irradiating means, and the suction means emits the light in a rotating direction of the drum. 2. The drawing apparatus according to claim 1, further comprising a suction port disposed downstream of the means. 7. The drawing apparatus according to claim 1, further comprising a blowing amount control unit for controlling a blowing amount of said blowing unit. 8. The apparatus according to claim 1, further comprising suction amount control means for controlling the suction amount of said suction means.
The drawing device according to any one of the above.