JP2001026152A - Image recording apparatus and drum used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly mount plates having a plurality of sizes on a drum. SOLUTION: An image recording apparatus has a drum having a plate of which the surface is coated with a sensitive material wound around the outer peripheral surface thereof, the recessed plate suction part formed to the outer peripheral surface of the drum, the route communicating with the plate suction part and a suction means for evacuating the inner space of the plate suction part through the route. The plate suction part is constituted of suction grooves 509, 513, 517 formed along the direction expanding the size of the plate when the plate different in size is wound around the drum and the suction holes 510, 514, 518 formed to the terminal parts of the suction grooves 509, 513, 517 in the direction contracting the size of the plate to connect the route.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus having a drum around which a plate as a recording medium is wound and fixed.

[0002]

2. Description of the Related Art Conventionally, there has been an apparatus for recording (exposing) an image by irradiating a laser beam on an aluminum plate having a surface coated with a light-sensitive material and fixing the aluminum plate around the outer surface, and irradiating the plate with a laser beam.

[0003] The drum of such an image recording apparatus rotates at high speed. Further, the plate has some weight and high elasticity. For this reason, during operation, the plate may be displaced from the drum to cause a recording failure, or in the worst case, the plate may be peeled off from the drum and popped out.

In order to solve the above problem, in the conventional image recording apparatus, the leading end and the trailing end of the plate are fixed to the outer peripheral surface of the drum with fixing brackets, and the plate is formed with grooves on the outer peripheral surface of the drum. By suctioning the inside of the groove with a pump, the plate is attracted to the outer peripheral surface of the drum, and the plate is securely mounted on the drum.

[0005]

However, in the conventional image recording apparatus, grooves are continuously formed on the outer peripheral surface of the drum, for example, in a grid pattern, and the insides are collectively sucked by a pump. For this reason, if there is a groove at a position on the outer peripheral surface of the drum that is not covered by the plate, the pump is sucked in an empty state, so that the suction force of the pump cannot be sufficiently obtained and the plate cannot be reliably sucked.

[0006] In order to solve such a problem, it is conceivable to form the groove in accordance with the size of the plate only in a portion covered by the plate. However, such an image recording device can only adapt to the size of one plate and cannot be used for recording images on plates of different sizes.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide an image recording apparatus capable of securely mounting a plurality of sizes of plates on a drum.

[0008]

According to an image recording apparatus of the present invention, a plate suction section is formed by a suction groove formed along a direction in which the size of a plate of a different size is increased when the plate is wound around a drum; And a suction hole formed at the end in the direction in which the size is reduced.

With this configuration, even when a part of the suction groove is covered with the plate, the suction hole is surely covered with the plate. Thereby, since the suction hole does not need to be opened, the entire suction groove can be sucked from the suction hole. As a result, the plate can be more reliably sucked to the outer peripheral surface of the drum.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image recording apparatus according to a first aspect of the present invention is an image recording apparatus comprising: a drum for winding a plate around an outer peripheral surface thereof; and a recording means for recording image information on the plate. In the apparatus, the drum includes a concave plate suction unit formed on an outer peripheral surface of the drum, a suction hole opened inside the plate suction unit, a path connected to the suction hole, and suction from the path. And a suction means for performing the operation described above, wherein the suction hole is provided close to the center of the drum.

With this configuration, even when a part of the suction groove is covered with the plate, the suction hole is surely covered with the plate. Accordingly, the suction hole does not need to be opened, so that the entire suction groove can be sucked from the suction hole. As a result,
The plate can be more reliably sucked to the outer peripheral surface of the drum 102.

According to a second aspect of the present invention, in the image recording apparatus according to the first aspect, the plate suction section is divided into a plurality of areas and formed independently in each area, and the plate is attached to the drum. The plate suction unit is arranged in a range where the peripheral edge of the plate may be located when the plate is wound.

[0013] With this configuration, the peripheral edge of the plate, which may not be completely covered by the plate in accordance with the size of the plate, can be located depending on the size of the plate. Are located in areas where there is a possibility. Thereby, the plate can be reliably sucked to the drum outer peripheral surface regardless of the plate size.

According to a third aspect of the present invention, in the image recording apparatus according to the first aspect or the second aspect, the path comprises a plurality of paths each communicating with a plate suction unit divided into a plurality of areas. .

With this configuration, the path communicating with the suction hole whose suction hole has been opened can be separated from the suction means. As a result, the suction hole does not need to be opened.

According to a fourth aspect of the present invention, there is provided a drum for winding a plate on which an image is recorded around an outer peripheral surface and adsorbing the plate by suction. An upper plate suction unit, a suction hole opened inside the plate suction unit, and a path connected to the suction hole are provided.

Even when a part of the suction groove is covered by the plate, the suction hole is surely covered by the plate. Accordingly, the suction hole does not need to be opened, so that the entire suction groove can be sucked from the suction hole. As a result, the plate can be more reliably sucked to the outer peripheral surface of the drum 102.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an image recording apparatus according to one embodiment of the present invention.

The image recording apparatus 101 is a so-called direct printing plate, which exposes an aluminum plate (hereinafter simply referred to as a plate) having a surface coated with a photosensitive material by irradiating it with a laser beam to record an image.

The drum 102 is mounted by winding a plate around its outer peripheral surface. The drum 102 is mounted on the holding table 1
A pair of bearings 104a and 104b rotatably support the unit 03.

A motor 105 is connected to one end of the drum shaft of the drum 102. Further, a rotary joint 106 is attached to the other end of the drum shaft. This rotary joint 106
The suction unit 107 as a negative pressure device is connected to a plurality of connecting pipes 10.
8 are connected.

On the other hand, the recording head 109 is connected to the drum 102
Is mounted on a linear motor 110 disposed along the axial direction of the motor. Accordingly, the recording head 109 runs along the drum 102 by the linear motor 110. Further, the control unit 109 sends a control signal to each part of the image recording apparatus 111 to control each part. This control unit 1
09 is connected to the operation unit 112.

FIG. 2 is a perspective view showing a drum of the image recording apparatus according to the embodiment.

The drum 102 has a front clamp bar 201 for fixing one end of the plate when the plate is wound around the outer peripheral surface thereof, and a rear clamp bar 202 for fixing the other end of the plate.

At both ends of the rear clamp bar 202,
A pair of clamp holding members 203 are provided. This clamp holding member 203 rotates around a drum shaft 204. With the rotation of the clamp holding member 203, the rear clamp bar 202 also moves along the circumferential direction of the drum 102. By moving the rear clamp bar 202,
Different sized plates can be secured when wrapped around drum 102. The position indicated by A in FIG.
This is the position of the rear clamp bar 202 when a two-size plate is wound around the drum 102. The position indicated by B in FIG. 2 is the position of the rear clamp bar 202 when a B2 size plate is wound around the drum 102. The position indicated by C in FIG. 2 is the position of the rear clamp bar 202 when the A1 size plate is wound around the drum 102. Further, the position indicated by D in FIG. 2 is the position of the rear clamp bar 202 when the B1 size plate is wound around the drum 102.

FIG. 3A is a longitudinal side view of the drum according to the above embodiment. As is clear from FIG. 3A, the drum 102 has a plurality of cylindrical members 301 to 306 having the same diameter and height arranged on substantially the same center, and the drum shaft is passed through these substantially centers. 204 is inserted and fixed.

FIG. 3B is an enlarged view of the vicinity of the drum shaft according to the above-described embodiment, which is shown in a region A in FIG. 3A.

On the outer peripheral surface of one end of the drum shaft 204,
The rotary joint 106 is attached. This rotary joint 106
Are formed with connection holes 307a to 307h for connecting the connection pipe 108 shown in FIG. A plurality of suction pipes 308 are connected to these connection holes 307 a to 307 h from inside the drum shaft 204.

The suction pipe 308 is drawn into the cylindrical members 301 to 306 through the drum shaft 204, bent toward the inner wall surfaces of the cylindrical members 301 to 306, and bent slightly inside along the inner wall surfaces. Piping is performed along the axial direction of the drum 102 as it is. Although only one suction pipe 308 is shown in FIG. 3B for convenience, the suction pipe 308 is connected to all the connection holes 307a to 307h, and the inside of the cylindrical members 301 to 306 is formed. Piping.

FIG. 4 is a vertical sectional view of the drum according to the above-described embodiment, taken along the line IV-IV shown in FIG.

The drum 102 has a double structure in which an inner cylinder member 401 and an outer cylinder member 402 are arranged concentrically. On the inner peripheral surface of the inner cylinder member 401, eight suction pipes 403 are provided.
To 410 are provided along the longitudinal direction of the drum 102. In correspondence with these suction pipes 403 to 410,
A rib 411 is provided between the inner cylinder member 401 and the outer cylinder member 402.
To 417 are provided along the longitudinal direction of the drum 102. The ribs 411 to 417 have suction holes 418 to 418 to the suction pipes 403 to 410 from the outer peripheral surface of the outer cylinder member 402.
423 communicates with the suction grooves 424 to 429.

In this example, eight suction pipes 403 to 4
Six out of ten suction pipes 403 to 408 are used.

The suction pipes 403 to 408 are shown in FIG.
Are connected to a plurality of connection pipes 108 by a rotary joint 106 shown in FIG.

FIG. 5 is an exploded view of the drum for explaining suction grooves provided on the outer peripheral surface of the drum according to the above embodiment. In FIG. 5, the lowermost side of the sheet corresponds to the position where the leading end of the plate abuts.

In this embodiment, the surface of the drum 102 is divided into a plurality of areas, and the suction grooves formed in these areas are sucked along the same path. That is, the surface of the drum 102 is covered by a plate having the smallest size corresponding to the image recording apparatus, and the first region 501 is a substantially rectangular shape, and the second to fourth regions are sequentially provided outside the first region 501. It is divided into 502-504.
In this example, the first area 501 is covered by the A2 size plate when the plate is wound. The second area 502 may be covered by the plate when the B2 size plate is wound. Also, the third area 50
3 may be covered by the plate when the A1 size plate is wound. Further, the outermost fourth region 504 may be covered by the plate when the B1 size plate is wound.

FIG. 6 is a partial plan view illustrating a suction groove and a suction hole formed in a drum in the image recording apparatus according to the above embodiment.

The first area 501 has a suction groove 505.
Are formed in a mesh shape along the circumferential direction and the axial direction of the drum 102. These suction grooves 505 are provided in the suction holes 5.
06 is communicated in some places. These suction holes 506 communicate with the first path.

In the second area 502, a plurality of suction grooves 507 are formed. The suction groove 507 is branched in a branch shape along the circumferential direction or the axial direction of the drum 102. The suction groove 507 communicates with the suction hole 508 in some places. An additional suction groove 509 is formed in the second region 502. The suction groove 509 extends along a direction in which the size of the plate is enlarged (hereinafter, referred to as an enlarging direction), in other words, along a circumferential direction or an axial direction of the drum 102. In this example, the additional suction groove 509 extends in the circumferential direction. A direction in which the size of the plate of the additional suction groove 509 is reduced (hereinafter, referred to as a reduction direction).
The side, that is, the end near the first region 501 communicates with the suction hole 510. These suction holes 508, 510
Communicates with the second path.

Similarly, a plurality of suction grooves 511 are formed in the third region 503. The suction groove 511 is branched in a branch shape along the circumferential direction or the axial direction of the drum 102. The suction groove 511 communicates with the suction hole 512 at various places. The third region 503 further includes an additional suction groove 5.
13 are formed. The suction groove 513 extends along the direction in which the plate is enlarged. This additional suction groove 5
The plate 13 has a suction hole 514 at the end in the reduction direction.
Is in communication with These suction holes 512 and 514 communicate with the third path.

Further, a plurality of suction grooves 515 are formed in the fourth region 504. The suction groove 515 branches in a branch shape along the circumferential direction or the axial direction of the drum 102. The suction groove 515 communicates with the suction hole 516 at some points. The fourth area 504 further includes an additional suction groove 5.
17 are formed. The suction groove 517 extends along the direction of enlargement of the plate. This additional suction groove 5
The end of the plate 17 on the reduction direction side has a suction hole 518.
Is in communication with These suction holes 516 and 518 communicate with the fourth path.

The aforementioned suction grooves 507, 509, 511,
In 513, 515, and 517, the gap in the enlargement direction is narrower than the groove in the reduction direction.

In this example, the first path for A2 is a suction pipe 403 shown in FIG. 4, the second path for B2 is a suction pipe 406, and the third path for A1 is a suction pipe 404,
07, B1 are suction pipes 405, 408
Each is composed.

Next, a suction control system in the image recording apparatus according to the above embodiment will be described. FIG.
FIG. 3 is a block diagram for explaining a suction control system in the image recording apparatus according to the embodiment.

Main pump 601 and sub pump 60
2 is a pump for sucking the plate. The suction power of the sub pump 602 is larger than that of the main pump 601.

The system connected to the main pump 601 branches into two at a branch point 605. This main pump 601
A check valve 603 and a reserve tank 604 are sequentially interposed between and a branch point 605. The check valve 603 prevents air from flowing from the main pump 601 to the drum 102 when the main pump 601 stops.

The pressure inside the reserve tank 604 becomes low when the main pump 601 stops. Thus, the reserve tank 604 sucks the plate to a negative pressure. This suction force continues until air flows from the side of the drum 102 into the reserve tank 604 and the pressure inside the reserve tank 604 becomes almost the same as the surrounding area.

One system I branched at the branch point 605 is:
It is connected to the first path of the drum 102 described above. The other system is connected to the first path opening / closing control unit 606. In the first path opening / closing control unit 606, the other system branches into three. The three branched systems II to IV are connected to the above-described second to fourth paths via electromagnetic on-off valves 606a to 606c, respectively.

On the other hand, the system 6 connected to the sub-pump 602
Reference numeral 21 is connected to the second path opening / closing controller 607. In the second path opening / closing control unit 607, the system 621 includes:
The three systems are branched into three, and are respectively connected to the systems II to IV at connection points 608 to 610 via electromagnetic on-off valves 607a to 607c.

Each of the above systems I to IV has a pressure detector 61
1 to 615 are interposed respectively to measure the pressure of each system.

Further, the control unit 109 controls the solenoid valve 60
6a to 606c and 607a to 607c are connected so as to be controllable, and the pressure detectors 611 to 615 are connected so as to be able to receive measured values.

Next, the operation of the image recording apparatus according to the above embodiment will be described.

The operator operates the operation unit 112 to input the size of the plate. Upon receiving this input, the control unit 109 rotates the clamp holding member 203 shown in FIG.
The front clamp bar 201 and the rear clamp bar 203 are set at positions corresponding to the size of the plate.
Next, after fixing the front end of the plate to the front clamp bar 201, the operator rotates the drum 102 and fixes the rear end of the plate to the rear clamp bar 202.
As a result, the plate is wound around the outer peripheral surface of the drum 102. When this operation is completed, the operator operates the operation unit 112, and causes the control unit 109 to input a signal for starting the suction operation from the operation unit 112.

Upon receiving the signal for starting the suction operation, the control unit 109 starts the main pump 601 and the sub pump 602. In the normal state, the control unit 109 causes the second path opening / closing control unit 6 to perform suction only with the main pump 601.
The 07-side solenoid on-off valves 606a to 606c are all closed.

The control section 109 includes a first path opening / closing control section 60.
6 is controlled to open a path connected to the area covered by the plate of the input size, close the other path, and shut off the main pump 601.

When the main pump 601 starts suction, the pressure detectors 611 to 614 detect the pressures of the respective systems I to IV. In addition, the pressure detector 615 is
The pressure of the system 621 between the path control unit 607 and the path control unit 607 is detected.

The control unit 109 determines whether the plate is correctly sucked by the suction grooves and the suction holes belonging to the first to fourth regions by detecting the pressures of the systems I to IV. The control unit 109 determines whether the plate is wound around the drum 102 at a correct position based on the determination result. Further, the control unit 109 detects a failure of the sub pump 602 from the pressure of the system 621. Further, the failure of the main pump 601 can be detected from the pressure of the system I detected by the pressure detector 611.

If the above detection result is appropriate, the control unit 109 starts the motor 105, starts the rotation of the drum 102, and starts the recording operation. On the other hand, if the detection result is inappropriate, the control unit 109 displays information such as that the plate is not wound correctly, the input plate size is wrong, or the pump is out of order. And sound.

When the recording operation is completed, the control unit 109
Stops the motor 105 for rotating the drum 102. However, even after stopping the motor 105, the drum 102
It keeps spinning for a while because it has inertia. Even in this state, the main pump 601 and the sub pump 602
Continue to suction to prevent the plate from peeling. Then, when the drum 102 is completely stopped, the control unit 109 stops the suction of the pump 601 and the sub-pump 602. In this way, a series of operations of image recording is completed.

Next, the operation of the image recording apparatus according to the above embodiment when the size of the plate is changed will be described.

FIG. 8 is a schematic diagram showing a state in which an A2 size plate is wound around the drum according to the above embodiment.

The plate 801 of A2 size is
02 covers the first region 501 on the outer peripheral surface, but does not cover the regions 504, 507, and 510.

In this case, the control unit 109 closes all the electromagnetic on-off valves 606a to 606c of the first path on-off control unit 606. Thus, the second to fourth paths connected to the suction grooves and the suction holes in the second to fourth regions 502 to 504 not covered with the plate 801 are shut off from the main pump 601. As a result, only the first path connected to the suction groove and the suction hole in the first area 501 covered by the plate 801 is connected to the main pump 601.

FIG. 9 is a schematic diagram showing a state where a B2 size plate is wound around the drum of the image recording apparatus according to the above embodiment.

The plate 901 of B2 size covers the first area 501 and the second area 502, but the third area
Area 503 and the fourth area 504 are not covered.

In this case, the control unit 109 opens the electromagnetic on / off valve 606 a of the first path on / off control device 606, closes the electromagnetic on / off valves 606 b and 606 c, and sets the third and fourth areas not covered by the plate 901. The third and fourth paths connected to 503 and 504 are shut off from the main pump 601. Accordingly, the third and fourth paths connected to the suction grooves and the suction holes of the third and fourth regions 503 and 504 not covered by the plate 901 are connected to the main pump 60.
Cut off from 1. As a result, only the first and second paths connected to the suction grooves and the suction holes of the first and second regions 501 and 502 covered by the plate 901 are connected to the main pump 601.

Similarly, in the case of an A1 size plate, the control unit 109 closes only the electromagnetic opening / closing valve 606c of the first path opening / closing control unit 606, and the fourth unit not covered by the plate.
The fourth path connected to the area 504 of the main pump 60
The first to third paths connected to the suction grooves and the suction holes in the first to third regions 501 to 503 covered by the plate are connected to the main pump 601 while being shut off from the first pump.

Further, in the case of a B1 size plate, the control unit 109 opens all the electromagnetic on-off valves 606a to 606c of the first path opening and closing control unit 606, and sets the first to fourth regions 501 to 504 covered by the plate. All of the first to fourth paths connected to the suction groove and the suction hole are connected to the main pump 60.
Connect to 1.

As described above, the suction force of the main pump 601 can be concentrated on the area covered by the plate.
Sufficient suction force to securely hold the plate can be obtained.

FIG. 10 is a schematic diagram showing a state in which an irregular-shaped plate having the same width as the A2 size and the length of the B1 size is wound around the drum of the image recording apparatus according to the above embodiment.

The irregular-shaped plate 1001 covers the entire first region 501, but the second to fourth regions 502
504 is partially covered. That is, the suction groove and the suction hole belonging to the first area 501 are completely covered by the plate 1001, whereas the second to fourth areas 502 to 5
04 and the suction holes belonging to the plate 100
There is a part covered with 1 and a part not covered.

In this case, the control unit 109 closes the electromagnetic on / off valves 606a to 606c of the first path on / off control unit 606, while closing the electromagnetic on / off valves 607a of the second path on / off control unit 607.
To 607c. Thus, only the first path connected to the first area 501 completely covered by the plate 1001 is connected to the main pump 601. Meanwhile, plate 1
The second to fourth paths connected to the second to fourth regions 501 partially covered by 001 are connected to the sub-pump 602.

Thus, in the first area 501,
The plate 1001 is sucked by the main pump 601,
In the second area 502 to the fourth area 504, the plate 1001 is suctioned by the sub pump 602. As a result, the first region 501 that is completely covered with the plate 1001 and needs to be sucked with a weak suction force is sucked with a weak suction force. Also, the second to fourth regions 502 to 50 that are partially covered with the plate 1001 and require a strong suction force
4 sucks strongly. As a result, the plate 1001 can be suctioned with an appropriate suction force according to the state of each area when the state in which the area is covered by the plate 1001 is different, so that the plate 1001 can be reliably mounted on the outer surface of the drum 102.

Further, as shown in FIG.
1 is disposed at the end of the suction groove 1102 on the reduction direction side of the plate 1103. By arranging in such a position, even when a part of the suction groove 1102 is covered by the plate 1103, the suction hole 1101 is surely covered by the plate 1103. Accordingly, the suction hole 1101 does not need to be opened, so that the entire suction groove 1102 can be sucked from the suction hole 1101. As a result, the plate 11
03 can be more reliably sucked to the outer peripheral surface of the drum 102.

Further, first to fourth regions 501 to 504
Since the suction grooves formed in are separated and independent from each other,
There is no effect between the suction groove in the area completely covered by the plate and the suction groove in the area partially covered by the plate. Thereby, the suction force of the suction groove in the region completely covered by the plate can be kept high.

As described above, according to the image recording apparatus of the present embodiment, even when a part of the suction groove is covered with the plate, the suction hole is surely covered with the plate. Thereby, since the suction hole does not need to be opened, the entire suction groove can be sucked from the suction hole. As a result,
The plate can be more reliably sucked to the outer peripheral surface of the drum.

Further, according to the image recording apparatus of this embodiment, the suction groove portion is provided in the region where the peripheral portion of the plate may be located, which may not be completely covered depending on the size of the plate. Since the plate suction portion constituted by the suction hole and the suction hole is arranged, the plate can be reliably sucked to the outer peripheral surface of the drum regardless of the plate size.

Further, according to the image recording apparatus of the present embodiment, since the effective suction holes and suction grooves are switched according to the size of the plate, unnecessary portions are not sucked. Since the unnecessary portions are not sucked as much as possible, the suction efficiency of the pump is good. In addition, the sub-pump having a stronger suction force than the main pump can compensate for the shortage of the suction force in the suction holes and the suction grooves that are not completely covered by the plate.

Further, in the above-described embodiment, an aluminum plate having a surface coated with a photosensitive material has been described as a recording medium, but any plate-shaped recording medium can be used.

Further, in the above-described embodiment, the plate suction portion has been described as including the suction groove and the suction hole. However, the plate suction portion is not limited to this, and only the suction groove and only the suction hole are provided. You may. Also, the suction groove may have a shape other than that described in the above embodiment, for example, a curve such as a circle.

[0081]

As described above, according to the present invention,
Since a plurality of sizes of plates can be reliably sucked while being wound on the drum, the plates can be reliably mounted on the drum.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an image recording apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a drum of the image recording apparatus according to the embodiment.

FIG. 3A is a longitudinal side view of the drum according to the embodiment; FIG. 3B is an enlarged view of the vicinity of the drum shaft according to the embodiment;

FIG. 4 is a vertical sectional view of the drum according to the embodiment.

FIG. 5 is a development view of the drum for explaining suction grooves provided on the outer peripheral surface of the drum according to the embodiment.

FIG. 6 is a partial plan view illustrating a suction groove and a suction hole formed in a drum in the image recording apparatus according to the embodiment;

FIG. 7 is a block diagram for explaining a suction control system in the image recording apparatus according to the embodiment;

FIG. 8 is a schematic diagram showing a state in which an A2 size plate is wound around the drum according to the embodiment.

FIG. 9 is a schematic diagram showing a state where a B2 size plate is wound around a drum of the image recording apparatus according to the embodiment;

FIG. 10 is a schematic diagram showing a state in which an irregular-shaped plate having the same width as the A2 size and a length of B1 size is wound around the drum of the image recording apparatus according to the embodiment;

FIG. 11 is an enlarged cross-sectional view near the suction groove according to the embodiment.

[Explanation of symbols]

102 Drum 107 Suction unit 201 Front clamp bar 202 Rear clamp bar 203 Clamp holding member 204 Drum shaft 403-410 Suction pipe 418-423, 506, 508, 510, 512, 5
14, 516, 518, 1101 Suction holes 424-429, 505, 507, 509, 511, 5
13, 515, 517, 1102 Suction groove 601 Main pump 602 Sub-pump 606, 607 Path opening / closing controller 606a-606c, 607a-607c Electromagnetic opening / closing valve 611-615 Pressure detector 801/901/1001/1103 plate

Claims (4)

[Claims] 1. An image recording apparatus comprising: a drum on which a plate is wound around and mounted on an outer peripheral surface; and recording means for recording image information on the plate, wherein the drum is formed on an outer peripheral surface of the drum. A recessed plate suction portion, a suction hole opened inside the plate suction portion, a path connected to the suction hole, and suction means for performing suction from the path, wherein the suction hole is provided at a center of the drum. An image recording apparatus provided near the side. 2. The plate suction unit is divided into a plurality of regions and is formed independently of each other in each region. When the plate is wound around the drum, there is a possibility that the peripheral edge of the plate is located. The image recording apparatus according to claim 1, wherein the plate suction unit is arranged in a certain range. 3. The image recording apparatus according to claim 1, wherein the path includes a plurality of paths respectively communicating with the plate suction unit divided into a plurality of areas. 4. A drum for wrapping a plate for recording an image around an outer peripheral surface thereof and adsorbing the plate by suction, wherein a concave plate suction unit for adsorbing the plate on the outer peripheral surface of the drum; A drum, comprising: a suction hole opened inside the unit; and a path connected to the suction hole.