JP2010153052A - Neutralization device for rotary press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a neutralization device which maintains the optimal position of neutralization without changing a positional relation between a neutralizer and a web even if a pass line changes accompanied with the movement of a movable roll on an upstream side and/or a downstream side of the movable roll of which the position of a rotary shaft is displaced with respect to the frame of a rotary press, such as a printer, a coater and a laminator. <P>SOLUTION: The neutralization device eliminates static electricity electrified to the web on the upstream side and/or the downstream side of the movable roll of the rotary press which performs processing of the web transported by the movable roll. The neutralizer of the neutralization device is supported by a support arm having a mechanism which connects the shaft of the movable roll and the roll shaft adjacent to the movable roll, and are expanded/contracted in the direction parallel to a straight line passing through the shaft of the movable roll and the shaft of the roll adjacent to the movable roll. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

 The present invention relates to a static eliminator that neutralizes static electricity charged on a web processed by a rotary press.

 In a rotary press (for example, a gravure rotary press), a web is charged by friction and peeling from a plate cylinder or a roll, and exceeds a certain charged potential, thereby causing a conductor having a potential difference from a charged object existing near the original fabric. Air discharge between. When air discharge occurs, there is a problem that quality defects such as holes are formed in the web web. In addition, if oxygen and the volatile organic solvent are present at a certain ratio in the place where the air discharge has occurred, there is a risk that a spark will be ignited by the spark of the discharge. As a conventional measure, when the raw material is a non-conductor single layer, a self-discharge type static eliminator (Patent Document 1), an ionizer (Patent Document 2), and the like are installed to eliminate static electricity. In particular, as a fire prevention, it was necessary to carry out neutralization reliably around the plate cylinder in a printing unit where oxygen and a volatile organic solvent are likely to exist at a certain ratio.

FIG. 3 is a side view showing an example of the installation of the static eliminator according to the prior art. The upstream side fixed roll 3 in which the position of the rotating shaft is fixed with respect to the frame of the printing press, and the rotating shaft with respect to the frame of the printing press. The web is wound around and conveyed in the order of the impression cylinder 2 and the downstream side fixing roll 4 which are displaced and moved relative to the plate cylinder 1. Since the static eliminator 8 is installed at a fixed position with respect to the frame of the printing press, the web pass line (during printing) in which the impression cylinder 2 indicated by the broken line is in contact with the plate cylinder 1 ( The distance between the static eliminator 8 and the web changes at the travel position 10 and the pass line 9 when the impression cylinder 2 and the plate cylinder 1 are separated from each other, so that the optimum static elimination effect cannot be maintained. The same problem occurs when the type of product to be printed is changed and the diameter of the plate cylinder 1 is changed.
As described above, in the rotary printing press, the pass line changes when the diameter of the plate cylinder 1 changes due to the attachment / detachment operation of the impression cylinder 2 with respect to the plate cylinder 1 and the type change. Every time the line changes, it is necessary to change the position of the static eliminator, which is a factor that reduces productivity.

 In order to solve this problem, a printing unit with an electrostatic removal device (Patent Document 3) has been devised. However, a ring of a mechanism in which the impression cylinder is supported by a pivotable arm and the impression cylinder is attached and detached by turning the arm. The present invention relates to a rotary press and cannot be applied to a rotary press having a mechanism in which the impression cylinder is attached and detached by a linear motion in the vertical direction. Further, although it is necessary to remove the electric charge on both the impression cylinder inlet side and the impression cylinder outlet side in order to remove the charge charged during conveyance, it was applicable only to one side.

 In addition, an automatic adjustment device for static eliminator installation position and a static eliminator (Patent Document 4) have been devised. In this method, the installation angle of the linear guide and the angle of the guide block from the trajectory associated with the raising / lowering of the impression cylinder of the static eliminator to be installed There is a problem that it takes a long time to design because it is cumbersome, for example, requiring an operation for determining the value of the image. Further, when installed in an existing printing press, it is difficult to fix the linear guide and the guide block at a predetermined angle, which is difficult to realize.

JP-A-5-258890 JP 62-105398 A Japanese Utility Model Sho 62-79749 JP 2006-49217 A

 The present invention has been made in view of such a situation, and the static eliminator and the web even if the pass line changes with the operation of the movable roll on the upstream side and / or the downstream side of the movable roll of the rotary press. An object of the present invention is to provide a static eliminator that maintains the optimal neutralization position without changing the positional relationship.

 The static eliminator for a rotary press according to the present invention is an upstream side and / or a downstream side of a rotary press that conveys and processes a web by a movable roll whose rotational axis is displaced with respect to the frame of the rotary press. A static eliminator that neutralizes static electricity charged on the web on the side, wherein the static eliminator of the static eliminator connects the axis of the movable roll and the axis of the roll adjacent to the movable roll, and the axis of the movable roll It is supported by a support arm having a mechanism that expands and contracts in a direction parallel to a straight line passing through the axis of the roll adjacent to the movable roll.

 According to the static eliminator for a rotary press of the present invention, since the static eliminator follows the displacement of the pass line and the optimum position is maintained simply by supporting the static eliminator with a simple support structure, each time the movable roll is operated. Necessary preparatory work is unnecessary and productivity is not reduced.

The present invention will be described below with reference to the drawings.
FIG. 1 is a schematic side view showing a first embodiment of the present invention. With respect to a plate cylinder 1, an impression cylinder 2 is guided in a vertical direction by a linear guide or the like and driven by an air cylinder 7 so as to move up and down. Do. A web is conveyed in the state wound around each roll in order of the upstream conveyance roll 3, the impression cylinder 2, and the downstream conveyance roll 4. FIG. The static eliminator 8 is supported by the support arm 5 and has a predetermined distance from the web pass line 9. Both ends of the support arm 5 are pivotally connected to the rotary shafts of the impression cylinder 2, the upstream transport roll 3, and the downstream transport roll 4, and an expansion / contraction mechanism 6 is provided in the middle.

 In the printing unit configured as described above, the impression cylinder 2 is lowered to press the web against the plate cylinder 1 as indicated by a broken line during printing, and the impression cylinder 2 is raised during non-printing. In these operations, the distance between the rotary shafts of the impression cylinder 2, the upstream conveyance roll 3, and the downstream conveyance roll 4 changes, but the support arm 5 has the expansion / contraction mechanism 6, so that the posture of the support arm 5 is always the impression cylinder 2. And the upstream side transport roll 3 and the downstream side transport roll 4 are on a straight line connecting the rotation axes, and the positional relationship between the static eliminator 8 supported by the support arm 5 and the web does not change, and the pass line 10 and pressure during printing are not changed. It becomes constant at the pass line 9 when the trunk 2 is raised.

 FIG. 2 is a schematic side view showing a second embodiment of the present invention. The impression cylinder 2 is supported by an impression cylinder support arm 11 in which the impression cylinder 2 and the rotation shaft of the downstream transport roll 4 are connected. Is rotated by the rotating shaft of the downstream side transport roll 4 to perform the ascending and descending operations with respect to the plate cylinder 1. The impression cylinder 2 can be operated without changing the positional relationship between the static eliminator 8 supported by the impression cylinder support arm 11 and the web pass line 9. On the other hand, on the upstream side, since the distance between the axes of the upstream side transport roll 3 and the impression cylinder 2 changes, the impression cylinder support arm 11 cannot be adopted, but in this case, the support arm 5 having the expansion / contraction mechanism 6 of the present invention is applied. be able to.

As the static eliminator used in the present invention, a self-discharge type static eliminator, an ionizer, a conductive molding or a string can be used. The expansion / contraction mechanism 6 may be a spline mechanism that is a commercially available mechanism member, a linear guide mechanism using a linear guide, or the like, in addition to a mechanism constituted by a pipe-like member and a member fitted to the pipe as shown in FIG. . Also, in the figure, the support arm is located on a line connecting the centers of the adjacent roll axes, but even if the support arm itself is set at an offset position, the direction of the expansion / contraction operation of the expansion / contraction mechanism is the center of the adjacent roll axis. The same effect can be obtained if it is parallel to the line connecting the two.
As described above, according to the present invention, in a rotary press that processes a web such as a printing press, a coater, and a laminator while transporting the web by a transport roll, a dancer roll that is used for controlling the impression cylinder or web tension of the above-described printing press. When neutralizing the web on the upstream side and / or the downstream side of the movable roll, the position adjustment work of the static eliminator is not required, and the productivity is improved.

The schematic side view which shows the 1st form of this invention. The schematic side view which shows the 2nd form of this invention. Side view showing an example of conventional static eliminator installation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Impression cylinder 3 Upstream conveyance roll 4 Downstream conveyance roll 5 Support arm which concerns on this invention 6 The expansion-contraction mechanism of a support arm 7 Air cylinder 8 Electric discharger 9 Pass line 10 Pass line at the time of impression cylinder fall 11 Impression cylinder support arm

Claims (1)

Static electricity charged on the web is neutralized on the upstream side and / or downstream side of the rotary roll of a rotary press that transports and processes the web with a movable roll whose rotational axis is displaced with respect to the frame of the rotary press. The static eliminator of the static eliminator connects the axis of the movable roll and the axis of the roll adjacent to the movable roll, and connects the axis of the movable roll and the axis of the roll adjacent to the movable roll. A neutralizing device for a rotary press, which is supported by a support arm having a mechanism that expands and contracts in a direction parallel to a straight line passing therethrough.

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