JP2002096951A - Member conveyor and method of making planographic plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member conveyor capable of conveying members to be conveyed at low cost without damaging the members. SOLUTION: One motor 24 is disposed to correspond to two conveying rollers 14. Normally, a one-way clutch 20 is turned off, but if the conveying rollers slip against an aluminum web 12 because of a decrease in force of friction between the aluminum web 12 and each conveying roller 14, the one-way clutch 20 is turned on to transmit the torque of the motor 24 to the conveying rollers 14. The diameter of the conveying roller 14 is set so that its peripheral speed is within a certain range with respect to the speed at which the aluminum web 12 is conveyed, and because the peripheral speed of the conveying roller 14 will not decrease below a certain value, a difference between the speed at which the aluminum web 12 is conveyed and the peripheral speed of the conveying roller 14 is maintained within a certain range to prevent damage to the aluminum web 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member conveying apparatus for conveying a member to be conveyed while being supported by a plurality of conveying rollers, and a lithographic printing plate manufacturing method using the member conveying apparatus.

[0002]

2. Description of the Related Art As an example of a conventional member conveying apparatus, a conveying apparatus for conveying an aluminum web as a support in a lithographic printing plate manufacturing process will be described as an example.

In recent plate making methods (including an electrophotographic plate making method), a lithographic printing plate such as a photosensitive printing plate or a heat-sensitive printing plate is widely used in order to facilitate automation of a plate making process. A lithographic printing plate generally sends out and transports a support (aluminum web) such as a sheet-like or coil-like aluminum plate, and sequentially performs surface treatment such as graining, anodic oxidation, silicate treatment, and other chemical treatments. Alternatively, they are appropriately combined, then coated with a photosensitive layer or a heat-sensitive layer (hereinafter collectively referred to as a “coated film”), dried, and then cut into a desired size.

The lithographic printing plate is subjected to plate making processes such as exposure, development, gumming, and the like, and is set in a printing machine. By applying ink, characters, images, and the like are printed on paper.

[0005] As a transport device in a lithographic printing plate manufacturing apparatus, there is a transport device having a plurality of transport rollers arranged in the transport direction of an aluminum web. These transport rollers are so-called free rollers, and rotate by friction with the aluminum web while supporting the aluminum web.

However, in such a configuration in which the transport roller rotates due to friction with the aluminum web, the rotation of the transport roller cannot follow the transport of the aluminum web due to the inertial resistance of the transport roller or a decrease in the holding force on the aluminum web.
A speed difference may occur between the transport speed of the aluminum web and the peripheral speed of the transport roller. When the speed difference is equal to or more than a certain value, the aluminum web and the transport roller are rubbed, so that the aluminum web is damaged.

On the other hand, Japanese Patent Application Laid-Open No. Hei 5-161269 discloses a tension holding groove 56 formed along a circumferential direction of a rubber cylinder 54 at predetermined intervals in an axial direction, as shown in FIG. A rubber roller 52 is described. By setting the width and the depth of the groove 56 to specific ranges, the holding force on the metal web is not reduced.

However, when such a groove 56 is formed,
The manufacturing cost of the transport roller (the tension holding rubber roller 52 in FIG. 3) increases.

On the other hand, there has been proposed a configuration in which a driving source such as a motor is provided to drive the transport roller in an auxiliary manner, thereby preventing friction between the aluminum web and the transport roller (Japanese Patent Application Laid-Open No. 2-52846). Gazette).

In the case where the driving force of the driving source is transmitted to the conveying rollers as described above, providing a driving source for each of the conveying rollers increases the equipment cost. It is preferable to transmit to a plurality of conveyance rollers by a transmission member such as.

However, even if there is a slight variation in the diameter of the transport roller, the peripheral speed of the transport roller is deviated from the transport speed of the aluminum web. Scratches occur.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described circumstances, and has been made in consideration of the above-described circumstances. An object of the present invention is to provide a method for producing a lithographic printing plate that does not cause any damage on the body.

[0013]

According to the first aspect of the present invention, a plurality of transport rollers supporting a member to be transported and rotatable in the same direction as the transport direction of the member to be transported, and at least one of the transport rollers One or a plurality of drive sources capable of driving a plurality of the transfer members in the transfer direction, and the peripheral speed when the transfer roller is rotated by the driving force of the drive source is set to the transfer speed of the transferred member. The diameter of each of the transport rollers is set so as to be within ± 0.5%.

The transported member is transported while being supported by a plurality of transport rollers. The transport roller rotates in the same direction as the transport direction of the transported member, and rotates by receiving a driving force of a drive source.

Since at least one drive source is capable of driving a plurality of transport rollers, the number of drive sources can be smaller than the number of transport rollers. The equipment cost is lower than in a configuration in which a drive source is provided for each of the transport rollers.

The diameter of each transport roller is set such that the peripheral speed when the transport roller is rotated by the driving force of the drive source is within ± 0.5% of the transport speed of the transported member. . Therefore, the aluminum web and the transport roller do not rub, and the aluminum web is not damaged.

According to a second aspect of the present invention, a plurality of transport rollers supporting the transported member and rotatable in the same direction as the transport direction by friction with the transported member are provided.
One or more drive sources capable of driving a plurality of the transport rollers in the transport direction, and when the rotation angular velocity of the transport rollers decreases to an angular velocity set corresponding to the transport speed of the transported member. Transmitting means for transmitting the driving force from the driving source to the transport roller.

The transported member is transported while being supported by a plurality of transport rollers. The transport roller rotates in the same direction as the transport direction of the transported member, and normally rotates in the same direction as the transport direction due to friction with the transported member.

Since at least one drive source is capable of driving a plurality of transport rollers, the number of drive sources can be smaller than the number of transport rollers. The equipment cost is lower than in a configuration in which a drive source is provided for each of the transport rollers.

When the rotation angular velocity of the transport roller decreases to an angular velocity set in accordance with the transport speed of the transported member,
Transmission means transmits the driving force from the driving source to the transport roller. That is, for example, when the rotational angular velocity of the transport roller decreases due to a decrease in the frictional force between the transported member and the transport roller, the transport roller rotates with the driving force from the driving source.
Since the peripheral speed of the transport roller is maintained at a predetermined value or more, the aluminum web and the transport roller do not rub, and the aluminum web is not damaged.

According to a third aspect of the present invention, in the second aspect of the present invention, the peripheral speed when the transport roller is rotated by the driving force of the drive source is less than the transport speed of the transported member. The diameter of each transport roller is set so as to be within 0.5%.

Thus, the friction between the aluminum web and the transport roller can be more effectively prevented, and the occurrence of scratches on the aluminum web can be prevented.

According to a fourth aspect of the present invention, in the second or third aspect, the transmission means is a one-way clutch.

Thus, the transmission means can be configured with a simple configuration.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a lithographic printing plate while transporting a lithographic printing plate support using the member transport device according to any one of the first to fourth aspects. Features.

Since the lithographic printing plate support is transported by using the member transport device according to any one of claims 1 to 4, the support (aluminum web) is manufactured without being damaged. The quality of the lithographic printing plate is improved.

Here, "manufacture a lithographic printing plate"
By applying various treatments to the support of the lithographic printing plate,
Includes any operations or steps to obtain the final product, a lithographic printing plate. For example, various processing steps for changing the physical properties, chemical properties, surface properties, etc. of the lithographic printing plate support (aluminum web), an application process of applying a coating solution to the support, and a lithographic printing plate. A cutting step of cutting (or cutting) to a desired size and the like are included.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 partially shows a web transfer device 10 according to an embodiment of the present invention. The web transport device 10 is used for transporting an aluminum web 12, which is a support for the lithographic printing plate, in a lithographic printing plate manufacturing line.

A delivery device is arranged at the most upstream side of the production line.
An aluminum coil in which a 0.5 mm aluminum web 12 is wound in a roll shape is loaded. The delivery device delivers the aluminum web to the downstream side at a speed corresponding to the transport speed of the entire production line.

Here, the aluminum plate as a material of the lithographic printing plate support is, for example, JIS1050 material, JI
S1100 material, JIS1070 material, Al-Mg based alloy,
Al-Mn alloy, Al-Mn-Mg alloy, Al-Z
An r-based alloy, an Al-Mg-Si-based alloy, or the like can be used. In the manufacturing process of an aluminum plate by a manufacturer, an ingot of aluminum conforming to the above-described standard is manufactured, and after hot-rolling this aluminum ingot, a heat treatment called annealing is performed as necessary, and a predetermined process is performed by cold rolling. Finish the aluminum strip into a thick strip. The aluminum plate is wound into a roll to form an aluminum coil.

The production line includes a straightening device (roller leveler, tension leveler, etc.) for improving the flatness of the aluminum web 12, an upper surface polishing device and a lower surface polishing device for polishing the upper and lower surfaces of the aluminum web 12, A roughening device for roughening the surface of the web 12 and an anodizing device for performing a known anodizing process on the aluminum web 12 are provided. These various devices perform necessary pretreatment on the aluminum web 12.

A coating device and a drying device are arranged downstream of the anodizing device. A desired coating solution is applied to the pretreated aluminum web 12, and the applied coating solution is applied to the aluminum web 12. Dried.

Specific examples of the photosensitive layer or the heat-sensitive layer of the lithographic printing plate include the following (1) to (11). (1) An embodiment in which the photosensitive layer contains an infrared absorber, a compound that generates an acid by heat, and a compound that crosslinks with the acid. (2) An embodiment in which the photosensitive layer contains an infrared absorbing agent and a compound which becomes alkali-soluble by heat. (3) An embodiment in which the photosensitive layer includes two layers: a layer containing a compound that generates radicals by laser light irradiation, a binder soluble in alkali, and a polyfunctional monomer or prepolymer, and an oxygen barrier layer. (4) An embodiment in which the photosensitive layer comprises two layers: a physical development nucleus layer and a silver halide emulsion layer. (5) An embodiment in which the photosensitive layer includes three layers: a polymerized layer containing a polyfunctional monomer and a polyfunctional binder, a layer containing silver halide and a reducing agent, and an oxygen barrier layer. (6) An embodiment in which the photosensitive layer includes two layers: a layer containing a novolak resin and naphthoquinonediazide; and a layer containing silver halide. (7) An embodiment in which the photosensitive layer contains an organic photoconductor. (8) An embodiment in which the photosensitive layer includes two or three layers composed of a laser light absorbing layer removed by laser light irradiation, and a lipophilic layer and / or a hydrophilic layer. (9) a compound in which a photosensitive layer absorbs energy to generate an acid, a polymer compound having a functional group capable of generating a sulfonic acid or a carboxylic acid in a side chain by an acid, and an acid generator by absorbing visible light The embodiment which contains the compound which gives energy to. (10) An embodiment in which the photosensitive layer contains a quinonediazide compound and a novolak resin. (11) An embodiment in which the photosensitive layer contains a compound which is decomposed by light or ultraviolet light to form a crosslinked structure with itself or another molecule in the layer, and a binder which is soluble in alkali.

The web transport device 10 of the present embodiment can be applied to any of the above-described steps, but is particularly applied to a processing step prior to the coating apparatus.

As shown in FIG. 1, the web transfer device 10
Has a plurality of (two in FIG. 1) transport rollers 14. As shown in FIG. 2, these transport rollers 14
The aluminum web 12 is partially wound and dried.

The rotating shaft 16 of the transport roller 14 is rotatably supported by a bearing device 18. Gears 22 are attached to the rotating shaft 16 via one-way clutches 20, respectively.

In the web transport device 10, one motor 2 is provided corresponding to the two transport rollers 14 described above.
4 are arranged. A chain 28 is wound around a drive gear 26 of the motor 24 and a gear 22 of the rotary shaft 16. When a sufficient frictional force acts between the aluminum web 12 and the transport roller 14 to rotate the transport roller 14 without slipping with respect to the aluminum web 12, the one-way clutch 20 is turned off, and the motor is turned off. 24 is not transmitted to the transport roller 14.
On the other hand, the frictional force between the aluminum web 12 and the transport roller 14 decreases, and the rotational angular velocity of the transport roller 14 decreases to a predetermined angular velocity set with respect to the transport speed of the aluminum web 12. , The one-way clutch 20 is turned on, and the torque of the motor 24 is transmitted to the transport roller 14.
As a result, the peripheral speed of the transport roller 14 does not become lower than a certain value, so that the speed difference between the transport speed of the aluminum web 12 and the peripheral speed of the transport roller 14 is maintained within a certain range.

As shown in FIG. 2, the diameter D of each of the transport rollers 14 in the present embodiment is determined in consideration of the transport speed of the aluminum web 12 and the variation in the diameter D of each of the transport rollers 14. The transport roller 1 is adjusted so that the peripheral speed is within ± 0.5% of the transport speed of the aluminum web 12.
4 are set for each.

Next, the operation of the web transport device 10 of the present embodiment will be described.

In a state in which a sufficient frictional force acts between the aluminum web 12 and the transport roller 14 (for example, in a dry state where the amount of water between the aluminum web 12 and the transport roller 14 is relatively small), the one-way The clutch 20 is in the off state, and the rotational force of the motor 24 is not transmitted to the transport roller 14.
4 rotates without slipping with respect to the aluminum web 12.
Therefore, the aluminum web 12 does not rub against the transport roller 14 and is not damaged.

The frictional force between the aluminum web 12 and the transport roller 14 is reduced (for example, a wet state where the water content between the aluminum web 12 and the transport roller 14 is relatively large), and the transport roller 14 is caused by inertia resistance or the like. When the rotational angular velocity of the motor 14 decreases to a predetermined angular velocity set with respect to the transport speed of the aluminum web 12 and slips on the aluminum web 12, the one-way clutch 20 is turned on, and the rotational force of the motor 24 Is transmitted. The diameter D of the transport roller 14 is set so that the peripheral speed when rotated by the rotational force of the motor 24 is within a certain range with respect to the transport speed of the aluminum web 12. The sliding relative to the aluminum web 12 is maintained within a certain range. Therefore, even in this state, the aluminum web 12 does not rub against the transport roller 14 and is not damaged.

As described above, in the web transport device 10 of the present embodiment, the slip between the aluminum web 12 and the transport roller 14 is prevented in any state (ie, whether it is dry or wet). And aluminum web 12
Can be prevented from being scratched by being rubbed.

In the above description, the transport roller 14 is
Although the description has been given by taking the example of the web transport device 10 provided with one, the number of the transport rollers 14 is not particularly limited as long as the number is plural. Although the number of motors 24 is not particularly limited, if at least one of the motors 24 is configured to be able to drive a plurality of transport rollers 14, the number of motors 24 may be smaller than the number of transport rollers 14. Since it is possible, equipment cost can be reduced, which is preferable. For example,
When three transport rollers 14 are provided, all three transport rollers 14 may be configured to be driven by one motor 24, or two motors 24 may be provided and one motor 24 The transport rollers 14 may be driven, and the two transport rollers 14 may be driven by another motor 24.

The configuration of the transport roller 14 is not particularly limited as long as the aluminum web 12 can be reliably supported and transported. However, if at least the portion where the aluminum web 12 contacts is made of rubber, the transport roller 14 and the aluminum web 12 are This is preferable because a large frictional force can be obtained between them and the aluminum web 12 can be more reliably prevented from being damaged.

In the present embodiment, the diameter D is set so that the peripheral speed of the transport roller 14 is within a certain range with respect to the transport speed of the aluminum web 12. Instead, even if the rotational force of the motor 24 is directly transmitted to the transport roller 14, the aluminum web 12 can be prevented from being scratched by being rubbed with the transport roller 14.

The transmission means of the present invention is not limited to the above-described one-way clutch 20. In short, the driving force of the motor 24 is not transmitted in the normal state, and only when the rotation angular velocity of the transport roller 14 is reduced, Motor 2
4 that transmits the driving force. For example, a sensor for detecting the angular velocity of the transport roller 14 may be provided, and the rotation of the motor 24 may be controlled by a signal from the sensor. As in the present embodiment, the one-way clutch 20
Is preferred from the viewpoint of reducing the equipment cost because the transmission means of the present invention can be configured with a simple configuration.

[0047]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it goes without saying that the present invention is not limited to these Examples.

In this embodiment, the thickness is 0.24 mm and the width is 13
A constant speed (60 to 90 m)
/ Minute), the web transfer device 1 of the present invention
0 was applied.

The surface of the transport roller 14 is made of CR (chloroprene rubber) having a hardness of 65 ° and a surface roughness (Ra) of 2.0 μm.
Surface length (axial length) 1600mm, φ240
Was used as a reference. Then, one having a diameter D larger than this and one having a smaller diameter D were prepared, and scratches on the aluminum web 12 were examined with and without driving by the motor 24. In each case, the contact state between the aluminum web 12 and the transport roller 14 was set to a dry state and a wet state and examined. Table 1 shows the results.

[0050]

[Table 1]

As can be seen from Table 1, when the diameter D of the conveying roller 14 is within the range of φ240 ± 1.2 and there is driving by the motor 24 (Examples 1 to 3), the conveying roller 14 is in a wet state. Even if there is, the speed difference between the transport speed of the aluminum web 12 and the peripheral speed of the transport roller 14 remains 0 or small (0.5%), so that the aluminum web 12 is not damaged. Although not shown in Table 1, in the configuration in which the diameter of the transport roller 14 is φ240-1.2, compared with the configuration in which the diameter of the
The rotational force acts on the transport roller 14 due to the frictional force between the roller and the transport roller 14 (it is lower than the dry state, but the frictional force itself exists), and as a result, the speed difference tends to be smaller. Therefore, from the viewpoint of preventing the aluminum web 12 from being damaged, it is more preferable.

On the other hand, when the diameter D of the conveying roller 14 is φ2
Even in the range of 40 ± 1.2, when there is no driving by the motor 24 (Comparative Examples 3 to 5), the difference between the transport speed of the aluminum web 12 and the peripheral speed of the transport roller 14 in the wet state is obtained. Since the degree of the speed difference is medium (1.0%) or large (greater than 1.0%), the aluminum web 12 is damaged.

Further, the diameter D of the conveying roller 14 is set to φ240 ±
In the case of 2.4 (Comparative Example 1, Comparative Example 2, Comparative Example 6, and Comparative Example 7), the transport speed of the aluminum web 12 and the The speed difference with the peripheral speed is medium (1.0
%) Or large (greater than 1.0%), so that the aluminum web 12 is damaged.

From the above results, in order to prevent the aluminum web 12 from being damaged, the transport rollers are controlled so that the speed difference between the transport speed of the aluminum web 12 and the transport roller 14 is 0.5% or less. It can be seen that setting the diameter D of each of the fourteen is sufficient.

[0055]

According to the first aspect of the present invention, a plurality of transport rollers that support the transported member and are rotatable in the same direction as the transport direction of the transported member, and at least one of the transport rollers is a plurality of the transport rollers. One or a plurality of drive sources capable of being driven in the transport direction, wherein the peripheral speed when the transport roller is rotated by the driving force of the drive source is ± 0 with respect to the transport speed of the transported member. Since the diameter of each transport roller is set so as to be within 0.5%, the equipment cost is reduced as compared with a configuration in which a drive source is provided corresponding to each transport roller, and an aluminum web is used. There is no rubbing with the transport roller and no scratch on the aluminum web.

According to the second aspect of the present invention, a plurality of transport rollers supporting the transported member and rotatable in the same direction as the transport direction by friction with the transported member are provided.
One or more drive sources capable of driving a plurality of the transport rollers in the transport direction, and when the rotation angular velocity of the transport rollers decreases to an angular velocity set corresponding to the transport speed of the transported member. Transmission means for transmitting the driving force from the drive source to the transport roller, and, compared to a configuration in which a drive source is provided for each of the transport rollers,
The equipment cost is reduced, and the aluminum web and the transport roller are not rubbed, and the aluminum web is not damaged.

According to a third aspect of the present invention, in the second aspect of the present invention, the peripheral speed when the transport roller is rotated by the driving force of the driving source is less than the transport speed of the transported member. Since the diameters of the respective transport rollers are set so as to be within 0.5%, the friction between the aluminum web and the transport rollers can be more effectively prevented, and the occurrence of scratches on the aluminum web can be prevented.

According to the fourth aspect of the present invention, in the second or third aspect of the present invention, since the transmission means is a one-way clutch, the transmission means can be configured with a simple configuration.

According to the fifth aspect of the present invention, a lithographic printing plate is manufactured while transporting a lithographic printing plate support using the member transport device according to any one of the first to fourth aspects. No damage occurs on the support (aluminum web), and the quality of the manufactured lithographic printing plate is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a web transport device according to an embodiment of the present invention.

FIG. 2 is a side view showing a schematic configuration of a web transport device according to one embodiment of the present invention.

FIG. 3 is a front view showing a tension holding rubber roller of a conventional transport device.

[Explanation of symbols]

 Reference Signs List 10 web transfer device (member transfer device) 12 aluminum web (member to be transferred) 14 transfer roller 20 one-way clutch (transmission means) 24 motor (drive source)

Claims (5)

[Claims] A plurality of transport rollers supporting the transported member and rotatable in the same direction as the transport direction of the transported member, at least one of which is capable of driving a plurality of the transport rollers in the transport direction. Or a plurality of drive sources, wherein the peripheral speed when the transport roller is rotated by the driving force of the drive source is ± 0.5% with respect to the transport speed of the transported member.
A member conveying device wherein the diameter of each conveying roller is set so as to be within the range. 2. A plurality of transport rollers that support a transported member and are rotatable in the same direction as the transport direction by friction with the transported member, and at least one of the transport rollers can drive a plurality of the transport rollers in the transport direction. One or a plurality of drive sources, and a transmission for transmitting a driving force from the drive source to a transport roller when a rotation angular speed of the transport roller decreases to an angular speed set in accordance with a transport speed of the transported member. A member conveying device comprising: 3. The diameter of each of the transport rollers is such that the peripheral speed when the transport rollers are rotated by the driving force of the drive source is within ± 0.5% of the transport speed of the transported member. The member conveying device according to claim 2, wherein the member conveying device is set. 4. The member conveying device according to claim 2, wherein said transmission means is a one-way clutch. 5. A lithographic printing plate manufacturing method, wherein a lithographic printing plate is manufactured while conveying a lithographic printing plate support using the member conveying device according to any one of claims 1 to 4. Method.