JP2012046334A - Apparatus for producing planographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing a planographic printing plate, which includes a reservoir unit for storing a web length by relatively moving a plurality of rollers around which a continuously-traveling belt-like aluminum web is wound by turns, and in which damage of the reservoir unit or a fracture of the aluminum web is prevented by a simple and highly responsive means.SOLUTION: The apparatus for producing the planographic printing plate includes a dancer roller 76 in which a swing arm 74 is moved by a cylinder 78 including a safety valve 84 to be opened at predetermined/fixed pressure or higher and the aluminum web W1 is always stored in the dancer roller 76. When abnormal tension is caused on the aluminum web W1 in the reservoir unit 26 or 54, the safety valve 84 is actuated by a pressure change in the cylinder, the air in the cylinder is emitted, the swing arm 74 is lowered and the whole aluminum web W1 stored in the dancer roller 76 is discharged, so that the abnormal tension of the aluminum web W1 is relieved.

Description

  The present invention relates to an apparatus for producing a lithographic printing plate, and in particular, includes a reservoir device for accumulating a web length by relatively moving a plurality of rollers for accumulating and accumulating continuously running strip-shaped aluminum webs. The present invention relates to a planographic printing plate manufacturing apparatus.

  A lithographic printing plate (hereinafter referred to as “PS plate”) is generally a coiled aluminum plate (hereinafter also referred to as “web”), which is subjected to surface treatment such as brushing, anodization, chemical conversion treatment, alone or in combination as appropriate, Next, the coating liquid is applied to the drying process after being applied.

  In the most upstream part of such a PS plate manufacturing apparatus (hereinafter also referred to as “equipment line”), a coil having a long web (referred to as “old web” for convenience of explanation) wound around a winding core, Next, a two-shaft feeding machine is provided in which a new web to be fed is loaded with a coil wound around a core.

  And since the web is sent out continuously without stopping the equipment line of the PS plate, before the old web runs out, the old web sent to the equipment line is cut, and a new coil is wound around the end part of the old web. The leading end of the new web is joined with a joining device to maintain the continuity of the web.

  In order to join the webs with a joining device, it is necessary to stop the webs, release the tension, and create slack. For this reason, the PS plate equipment line is provided with a reservoir device for accumulating the web length.

  As shown in FIG. 3, the reservoir device 1 includes a plurality of upper rollers 2, a plurality of lower rollers 3, a movable base 4, an adjustment wire 5, pulleys 6 a, 6 b, 6 c, a reel 7, and a motor 8. The upper roller 2 can be moved up and down together with the movable table 4, and the web W is wound around the upper roller 2 and the lower roller 3 in order.

  When the adjustment wire 5 is wound around the reel 7, the movable base 4 is raised, and the web W accumulated in the reservoir device 1 becomes longer. Further, when the adjustment wire 5 is wound around the reel 7, the movable base 4 is lowered, and the web W accumulated in the reservoir device 1 is sent out. Thereby, even if the upstream web W stops traveling, various processes can be performed on the downstream side without stopping the web W (for example, Patent Document 1).

JP 2004-244148 A

  However, in the planographic printing plate manufacturing apparatus such as cited document 1, since the web is wound around the roller as shown in FIG. 3, excessive tension may be generated on the web. There is a problem that the reservoir device is damaged or the web is broken.

  The present invention has been made in view of such circumstances, and has a reservoir device for accumulating the web length by relatively moving a plurality of rollers for accumulating and accumulating continuously running strip-shaped aluminum webs. An object of the present invention is to provide an apparatus for producing a lithographic printing plate that prevents the reservoir device from being broken or the web from being broken by simple and responsive means in the lithographic printing plate producing apparatus. .

  In order to achieve the above object, the present invention provides a lithographic printing plate provided with a reservoir device for accumulating the web length by relatively moving a plurality of rollers for accumulating and accumulating belt-shaped aluminum webs that are continuously running. In the manufacturing apparatus, a dancer roller that operates a swing arm with a cylinder provided with a safety valve that opens at a predetermined pressure or higher is provided. The dancer roller always stores the aluminum web, and stores in the reservoir device. When an abnormal tension is generated in the aluminum web in step 1, the safety valve is operated by the pressure change in the cylinder, the air inside the cylinder is released and the swing arm is lowered, and all the aluminum web stored in the dancer roller is released, Absorbs abnormal web tension To.

  According to the present invention, when an abnormal tension occurs, the swing arm is pulled and the pressure inside the cylinder rises. However, when the safety valve connected to the cylinder reaches a predetermined pressure (a reference pressure or higher), it automatically opens. Thus, the cylinder is lowered and the length of the web in the reservoir device is shortened, the stored web is released, the web is loosened, and the tension is reduced. This absorbs abnormal tension.

  Therefore, according to the present invention, it is possible to prevent the reservoir device from being damaged or the web from being broken by a simple and responsive means.

  According to the present invention, an apparatus for producing a lithographic printing plate comprising a reservoir device for accumulating a web length by relatively moving a plurality of rollers for alternately winding and accumulating belt-like aluminum webs that continuously travel is provided in a simple manner. In addition, it is possible to prevent the reservoir device from being broken or the web from being broken by means having excellent responsiveness.

Overall schematic diagram of planographic printing plate manufacturing equipment Schematic showing a dancer roller according to the present invention 1 is a schematic view of a reservoir device according to the present invention.

  Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments listed here.

  FIG. 1 is a schematic view showing the whole of a planographic printing plate manufacturing apparatus provided with a reservoir device.

  As shown in FIG. 1, a biaxial feeder 12 is disposed at the most upstream part of the planographic printing plate manufacturing apparatus 10. On one side of the rotating arm 66 of the delivery machine 12, a web (for convenience of explanation, referred to as “old web W1”: a web that has been sent out in advance) is wound around the core 16 in a roll shape. 20 is loaded, and on the other side of the rotating arm 66, a coil 22 in which a web (referred to as “new web W2”: meaning a web fed next) is wound around the winding core 18 in a roll shape. Is loaded.

  Then, the rotating arm 62 is rotated around the shaft portion 68, and the positions of the coil 20 and the coil 22 are exchanged, whereby the new web W2 is sent out from the new coil 22, and the coil 20 is extracted, and the next new The coil is loaded.

  The old web W1 delivered from the delivery machine 12 passes through the joining device 24 and reaches the reservoir device 26. When the old web W1 and the new web W2 are temporarily stopped and joined by the joining device 24, the reservoir device 26 keeps the upper and lower rollers 26A approaching to send out the accumulated old web W1 so that the equipment line does not stop. Is.

  Further, the old web W1 delivered from the reservoir device 26 includes, for example, a brushing / water washing treatment step 28, an alkali etching / water washing treatment step 30, a desmut treatment step 32, an electrolytic surface roughening treatment step 34, and an alkali etching treatment step 36. , Anodizing treatment step 38, sealing treatment step 40, hydrophilic treatment step 42, drying step 44, first photosensitive layer coating step 46, drying step 48, second photosensitive layer coating step 50, and drying step 52. It is accumulated in a reservoir device 54 provided for the replacement operation of the side winding core, and wound around the winding core 56 as a web of a lithographic printing plate.

  Further, a bridle roller 58 (shown only in one place in FIG. 1) is provided between each process, and the old web W1 is conveyed at a predetermined speed and the web tension is cut. Thus, the tension required for each process is applied to the old web W1.

  Here, in the planographic printing plate manufacturing apparatus 10 provided with the reservoir device of FIG. 1, since the web is wound around the reservoir devices 26 and 54, excessive tension may be generated on the web. In this case, there is a problem that the reservoir devices 26 and 54 are damaged or the web is broken.

  Therefore, as shown in FIG. 2, the present application includes a dancer roller that operates a swing arm with a cylinder provided with a safety valve that opens at a predetermined pressure or more, and the dancer roller always stores the web. In addition, when abnormal tension occurs in the web in the reservoir device, the safety valve operates due to the pressure change inside the cylinder, the air inside the cylinder is released and the swing arm is lowered to release all the aluminum web stored in the dancer roller. It was decided to absorb the abnormal tension of the aluminum web. 2 is provided closer to the reservoir devices 26 and 54 than the bridle roller (not shown). The position where the dancer roller is provided may be on the upstream side or the downstream side of the reservoir device. By providing the dancer device according to the present invention on the upstream side or the downstream side within 10 m of the web length from the reservoir device, the response speed at the time of abnormality can be increased. More preferably, it is within 5 m.

  As shown in FIG. 2, the dancer device 70 includes a swing arm 74 that is swingably supported by a support shaft 72. A dancer roller 76 is attached to the tip of the swing arm 74. The swing arm 74 is suspended from the piston rod 78a of the cylinder 78, and the dancer roller 76 is moved to the upper limit by contracting the piston rod 78a.

  Two pass rollers 80 and 82 are provided on the left and right of the dancer roller 76, and the old web W 1 wound around the pass roller 80 from below is wound on the dancer roller 76 from above, and further, the pass roller 82. Is wound from below. In addition, a safety valve 84 is provided at the supply side port of the cylinder 78, and the safety valve 84 is used that opens at a predetermined pressure or more.

  When the air inside the cylinder 78 is released, the piston rod 78a is extended, and the dancer roller 76 can be lowered to the lower limit.

  Here, in the dancer apparatus 70, the lithographic printing plate is manufactured with the dancer roller 76 storing the web at the upper limit position.

  When an abnormal tension is generated in the web W1 in the reservoir devices 26 and 54, a large force is applied to the cylinder 78, the safety valve 84 is operated by a pressure change in the cylinder, the air in the cylinder is released, and the swing arm 74 is released. Is lowered to the lower limit, all the web W1 stored in the dancer device 70 is released and the abnormal tension of the web is absorbed.

  As described above, when an abnormal tension is generated, the swing arm 74 is pulled and the pressure inside the cylinder 78 rises. However, when the safety valve 84 connected to the cylinder 78 reaches a predetermined pressure (a reference pressure or higher), the automatic operation is automatically performed. Since the cylinder is released, the length of the cylinder is lowered and the length of the web in the apparatus is shortened, the stored web is released, the web is loosened, and the tension is reduced. This absorbs abnormal tension. Thereby, it is possible to prevent the reservoir devices 26 and 54 from being damaged or the web W1 from being broken.

  Here, the predetermined pressure (reference pressure) of the safety valve 84 is a pressure (approximately 4000 N) that is about 1.5 times the pressure applied during the production of a normal planographic printing plate. Therefore, when an abnormality of about 1.5 times or more than the force applied to the dancer roller 76 at normal times occurs, the safety valve 84 is automatically opened, the air inside the cylinder is released, and the swing arm 74 is lowered to the lower limit. Thereby, since all the webs W1 stored in the dancer device 70 are released and the abnormal tension of the web is absorbed, it is possible to prevent the reservoir devices 26 and 54 from being damaged or the web W1 from being broken.

  The dancer device 70 according to the present invention is preferably provided in both the reservoir device 26 and the reservoir device 54, but may be provided in only one of the reservoir device 26 and the reservoir device 54.

DESCRIPTION OF SYMBOLS 1 ... Reservoir apparatus, 10 ... Planographic printing plate manufacturing apparatus, 12 ... Delivery machine, 16 ... Core, 18 ... Core, 20 ... Coil, 22 ... Coil, 24 ... Joining device, 26 ... Reservoir device, 54 ... Reservoir device, 56 ... winding core, 70 ... dancer device, 72 ... support shaft, 74 ... swing arm, 76 ... dancer roller, 78 ... cylinder, 80 ... pass roller, 82 ... pass roller, 84 ... safety valve

Claims (1)

In an apparatus for producing a lithographic printing plate comprising a reservoir device for accumulating a web length by relatively moving a plurality of rollers for alternately winding and accumulating belt-shaped aluminum webs that continuously run,
A dancer roller that operates a swing arm with a cylinder equipped with a safety valve that opens at a predetermined pressure or higher,
In the dancer roller, the aluminum web is always stored, and when an abnormal tension is generated in the aluminum web in the reservoir device, the safety valve operates due to a pressure change inside the cylinder and the air inside the cylinder is released and swings. An apparatus for producing a lithographic printing plate, characterized in that when the arm is lowered, all of the aluminum web stored in the dancer roller is discharged and the abnormal tension of the aluminum web is absorbed.

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