JPH0443324Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a printing unit for a gravure printing press, and more particularly to a printing unit equipped with a static eliminator for removing static electricity from a printing web.

[Conventional technology]

Usually, a static electricity removing device is disposed between the nip portion between the plate cylinder and the impression cylinder and the guide roll downstream of the nip portion to remove static electricity from the printing web.
Both the static eliminator and the guide rolls are mounted directly on the unit frame.

[Problem that the invention attempts to solve]

However, in such a conventional configuration, when the plate cylinder changes from a large diameter to a small diameter, the running position of the web changes, which increases the distance between the web and the static eliminator, weakening the removal effect, or when the plate cylinder changes from a small diameter to a small diameter. When changing to a larger diameter, the static eliminator comes into contact with the web,
This friction results in the generation of static electricity. Therefore, there is a problem in that it is necessary to move the position of the static eliminator in accordance with the web every time the diameter of the plate cylinder changes.

In order to avoid this work, it is known that a static electricity removing device is installed at the position of the guide roll so that it is less affected by variations in the diameter of the plate cylinder. However, the location where static electricity is most likely to occur is the nip between the plate cylinder and the impression cylinder, and unless it is removed immediately, it is ineffective, and accidents due to static electricity cannot be prevented at the guide roll position.

The present invention was devised in view of the problems of the prior art, and it is possible to always maintain the static eliminator at a constant position relative to the web without adjusting the position, regardless of changes in the diameter of the plate cylinder. The purpose is to provide printing units.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention protects the first guide roll downstream of the impression cylinder at the center of rotation of the impression cylinder support arm that can rotate while supporting the impression cylinder.
A static eliminator is held on the impression cylinder support arm at a position close to the printing web between the impression cylinder and the guide roll.

[Effect]

In the apparatus configured as described above, when the diameter of the plate cylinder changes due to replacement of the plate cylinder, the impression cylinder moves in accordance with the change, and the traveling position of the web changes accordingly. However, since both the impression cylinder and the guide roll immediately after it are held by the impression cylinder support arm, the web running position during this time does not change with respect to the impression cylinder support arm.
Therefore, the static eliminator held on the impression cylinder support arm is always maintained at a constant position relative to the web. Furthermore, since the guide roll is held at the center of rotation of the impression cylinder support arm, its position does not change even if the impression cylinder support arm moves due to changes in the plate cylinder diameter.
Therefore, there is no change in the web running position downstream of the first guide roll, and there is no problem.

〔Example〕

Hereinafter, preferred embodiments of the present invention shown in the drawings will be described. In FIGS. 1 and 2, 1 is a plate cylinder, and 2 is an impression cylinder. The impression cylinder 2 is held at the tip of an impression cylinder support arm 3. This impression cylinder support arm 3 is provided so as to be pivotable around a pivot center A (see FIG. 2),
A pressurizing cylinder 4 is connected to the tip. Furthermore, the impression cylinder support arm 3 holds a first guide roll (referred to as the first guide roll) 5 downstream of the impression cylinder at its rotation center A, and also holds a first guide roll (referred to as the first guide roll) 5 between the impression cylinder 2 and the first guide roll 5. , a web 6 running between the two
A static eliminator 7 is held at a position close to.

In the above apparatus, as shown in FIG. 2, when a large diameter plate cylinder 1 is used, the impression cylinder 2, impression cylinder support arm 3, web 6, static eliminator 7, etc. are located at the positions shown by solid lines. Yes, the static eliminator 7 is connected to the plate cylinder 1 and the impression cylinder 2.
At the downstream side of the nip portion between the web 6 and the web 6, static electricity from the web is removed. When this plate cylinder 1 is replaced with a smaller diameter plate cylinder 1A shown by the chain double-dashed line, and then the impression cylinder 2 is pressed against the plate cylinder 1A, the impression cylinder, the impression cylinder support arm, and the web all move as shown by the chain double-dashed line.
Move to the positions indicated by A, 3A, and 6A. at the same time,
Since the static eliminator 7 is also held by the impression cylinder support arm 2, it moves together with the impression cylinder support arm to the position shown by the two-dot chain line 7A, and the static eliminator 7A and the web 6
The distance from A does not change. In this way, the static electricity eliminator moves according to changes in the web running position based on plate cylinder 1 exchange without any adjustment of its mounting position, and the distance between the two is always kept constant, ensuring good static electricity removal. will be held. Furthermore, since the impression cylinder support arm 5 is located at the center of rotation of the impression cylinder support arm 3, the first guide roll 5 is always at a constant position regardless of the rotation of the impression cylinder support arm 3, and therefore The web running position downstream of the first guide roll 5 does not change.

[Effect of idea]

As described above, in the present invention, a guide roll is held at the center of rotation of the impression cylinder support arm, and a static eliminator is disposed between the impression cylinder and this guide roll, and this is held by the impression cylinder support arm. Therefore, regardless of the diameter of the plate cylinder, the static eliminator can be kept at a constant distance from the web immediately downstream of the impression cylinder, resulting in the effect that good static removal is always possible. It will be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention;
FIG. 2 is a schematic sectional view illustrating its operation. DESCRIPTION OF SYMBOLS 1... Plate cylinder, 2... Impression cylinder, 3... Impression cylinder support arm, 5... First guide roll, 6... Web, 7
...Static eliminator.

Claims (1)

[Scope of utility model registration request] A plate cylinder, an impression cylinder pressed against the plate cylinder, an impression cylinder support arm that is rotatable while supporting the impression cylinder, a guide roll held at the center of rotation of the impression cylinder support arm, and the impression cylinder 1. A printing unit with a static eliminator, comprising: a static eliminator held on the impression cylinder support arm at a position close to the printing web between the printing unit and the guide roll.