JPH061412Y2 - Local exhaust system for printing unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a local exhaust device for efficiently exhausting solvent gas in a printing unit of a gravure printing machine.

[Conventional technology]

Conventionally, a local exhaust device for exhausting a solvent gas generated from ink during printing has been used in a printing unit. As shown in FIG. 5, the conventional local exhaust device is provided with a large suction port 3 that substantially covers the lower part of the plate cylinder 1 and the ink pan 2, or as shown in FIG.
It is known that a long suction port 4 is provided along the upper edges of the plate cylinder 1 and the ink pan 2. In addition, in FIG. 5 and FIG.
5 is a gas suction pipe.

[Problems to be solved by the device]

However, the local exhaust device having the above structure has the following problems. That is, the structure shown in FIG. 5 requires a large installation space for the suction port 3 and must be moved in accordance with the up-and-down movement of the ink pan 2, which complicates the structure. In the structure shown in FIG. 6, the suction port 4 interferes with the work during printing, and the suction port 4 must be removed when the plate cylinder or the ink pan is removed, which requires extra work for attachment and detachment.

The present invention has been made in view of such conventional problems,
The mounting space is small, and it does not interfere with the work during printing,
It is an object of the present invention to provide a local exhaust device having a suction port that does not require attachment / detachment or movement.

[Means for Solving the Problems]

The present invention, which has been made to achieve the above object, has a pair of frames arranged vertically so as to face each other, a plate cylinder holding portion at each tip, and the tips are opposed to each other on the same horizontal axis. A pair of plate cylinder shafts attached to the pair of frames, a plate cylinder held at the tips of the pair of plate cylinder shafts, and an ink pan provided under the plate cylinders so as to be vertically movable. A plate cylinder shaft cover provided on both sides of the printing unit so as to surround the plate cylinder shaft, the plate cylinder shaft cover being located substantially on the same plane as the end face of the ink pan; A plate cylinder shaft cover having an end surface provided so that the plate cylinder shaft extends therethrough, a suction port formed in the end surface of the plate cylinder shaft cover, and a suction means connected to the suction port. Have It is summarized as local exhaust ventilation of the printing unit according to claim.

[Action]

According to the local exhaust device having the above configuration, the plate cylinder shaft cover is provided so as to surround each of the pair of plate cylinder shafts provided so as to hold both ends of the plate cylinder, and the plate cylinder shaft cover includes
Since the end face which is almost the same as the end face of the ink pan is formed and the plate cylinder shaft is extended from the end face, the end face of the plate cylinder shaft cover is close to both end faces of the plate cylinder held by the plate cylinder shaft. However, since it is located outside both ends of the plate cylinder and above the ink pan, it does not hinder the installation and removal of the plate cylinder and the lifting and lowering of the ink pan and its installation and removal. By forming the suction port on the end surface of the plate cylinder shaft cover, the suction port does not interfere with the mounting or removal of the plate cylinder or the ink pan, or the raising and lowering of the ink pan. It is not necessary and does not hinder the printing work.
In addition, since this suction port is located in the immediate vicinity of the solvent gas generation source during printing, gas can be efficiently exhausted.

〔Example〕

An embodiment of the present invention shown in FIGS. 1 to 4 will be described below.

In the figure, 1 is a plate cylinder, 2 is an ink pan, and 6 is a plate cylinder 1.
A pair of frames which are located on both sides of the frame and are vertically arranged so as to face each other. The plate cylinder 1 used in this embodiment is a shaftless plate cylinder. A pair of frame 6 has a pair of plate cylinder shafts 7 each having a tapered plate cylinder holding portion at the ends thereof, and the plate cylinder shafts 7 are held so that the ends thereof face each other and are located on the same horizontal axis. The plate cylinder 1 is supported by fitting the plate cylinder holding portion into a hole in the end surface of the plate cylinder 1. The plate cylinder shaft 7 is movable in the axial direction, and the plate cylinder 1 can be removed by retracting the plate cylinder shaft 7 from the position shown in FIG. A plate cylinder shaft cover 8 that surrounds the plate cylinder shaft 7 is attached to the mutually facing surfaces of the frames 6 on both sides. The plate cylinder shaft cover 8 is located at a position facing the end surface of the plate cylinder 1 and is substantially flush with the end surface 2A of the ink pan 2.
A plate cylinder shaft 7 extends through the end surface 8A thereof. A suction port 9 is formed on an end surface 8A of the plate cylinder shaft cover 8. A suction pipe 10 is connected to the suction port 9.

The plate cylinder shaft cover 8 has sealing surfaces 8B and 8C on the outer periphery of an end surface 8A which is substantially the same surface as both end surfaces 2A of the ink pan 2. The sealing surface 8B is located on the lower surface, and the upper edge of the ink pan 2 is pressed against it and sealed. The sealing surface 8C is located on the upper surface, and
As shown in the figure, a sealing surface for supporting the sheet-shaped or plate-shaped shielding material 11 is formed. In FIGS. 3 and 4, a doctor holder 12 holds a plate-like or sheet-like saucer 13 under the doctor holder. The doctor holder 12 can be moved between the position shown in FIG. 3 and the position shown in FIG. When the doctor holder 12 is at the position shown in FIG. 4 and the blocking member 11 is attached to the sealing surface 8C of the plate cylinder shaft cover 8, the upper opening of the ink pan 2 becomes
The end face 8A, the shielding material 11, the doctor holder 12, the saucer 13 and the like are hermetically sealed. In other words, the end surface 8A of the plate cylinder shaft cover 8 constitutes a part of a sealing device that seals the upper opening of the ink pan.

A spray ball 15 capable of spraying a cleaning solvent is housed in the suction port 9, and the spray ball 15 is moved to a standby position shown in FIG. 1 and an operating position shown in FIG. 2 by a drive mechanism 16. Can be moved.

Next, the operation of the device having the above structure will be described. During normal printing, as shown in FIGS. 1 and 3, the shielding member 11 is removed from above the plate cylinder, and the plate cylinder has an impression cylinder (not shown).
Is pressed and printing is performed. At this time, one side of the plate cylinder is covered with a doctor holder 12 and a sag 13 below it to prevent excess ink scratched by the doctor from splashing outside, and on the other side, a plate-like member is formed. Honey cover 1
No. 4 is attached to prevent ink from splashing from the ink pan on the print. The solvent gas evaporated from the ink in the ink pan during printing is leaked mainly from the both ends of the plate cylinder because both sides of the plate cylinder are covered with the sag 13 and the honey cover 14, but the suction port 9 is arranged at this position. Therefore, it is immediately and effectively sucked and removed from the suction port 9. Since the suction port 9 is located outside both ends of the plate cylinder 1, it does not hinder the printing work.
Also, there is no problem in removing the plate cylinder and ink pan,
It may remain fixed in the illustrated position.

The illustrated apparatus can be cleaned without removing the plate cylinder or the ink pan, and its cleaning operation will be described. After printing, raise the impression cylinder (not shown) to move the cover
4 is removed, and as shown in FIG. 4, the doctor holder 12 is raised and the shielding material 11 is attached. This closes the upper opening of the ink pan 2 and the plate cylinder 1. In this state, a spray nozzle (not shown) sprays a cleaning solvent onto the plate cylinder 1 to clean the plate cylinder. After the cleaning is completed, the cleaning solvent inside is discharged, and the solvent gas inside is discharged from the suction port 9 to prepare for the release of the airtightness. Next, the shield 11 is once opened, the plate cylinder inside is removed, and then the top of the ink pan is covered again with the shield 11 and the spray ball 15 is advanced to the position shown in FIG. Spray cleaning solvent from. The inner surface of the ink pan is cleaned well by spraying the cleaning solvent. After the cleaning is completed, the internal cleaning solvent is discharged and the internal solvent gas is exhausted from the suction port 9 as in the previous case. Thus, the suction port 9 is also used for discharging the solvent gas after cleaning.

[Effect of device]

As described above, the local exhaust device of the present invention is provided with the end surface 8 of the plate cylinder shaft cover 8 which is provided near both ends of the plate cylinder.
Since the suction port 9 is provided in A, the solvent gas can be sucked from the immediate vicinity of the solvent gas generation source during printing,
Gas can be efficiently exhausted. Moreover, since the suction port 9 is arranged at a position where it does not interfere with the removal of the plate cylinder 1 and the raising and lowering of the ink pan, it can be fixedly installed, and can be detached or moved during the switching work as in the conventional case. It is possible to simplify the structure without needing to do so and without disturbing the printing work.

[Brief description of drawings]

1 and 2 are sectional views showing an embodiment of the present invention,
FIG. 1 shows a state during printing, and FIG. 2 shows a state during ink pan cleaning. FIG. 3 is a view of FIG. 1 viewed in the direction of arrow III-III, FIG. 4 is the same sectional view as FIG. 3 showing a state during plate cylinder cleaning, and FIGS. It is a schematic sectional drawing which shows. 1 ... Plate cylinder 2 ... Ink pan 6 ... Frame 7 ... Plate cylinder shaft 8 ... Plate cylinder shaft cover 8A ... End face 9 ... Suction port 10 ... Suction tube 11 ... Shielding material 12 ... Doctor holder 13 ... Sagging 14 ... Honey cover 15 ... Spray ball

Claims (1)

[Scope of utility model registration request] 1. A pair of frames which are vertically arranged so as to face each other, and each of which has a plate cylinder holding portion at a tip thereof, and the tips are opposed to each other and are located on the same horizontal axis. In a printing unit having a pair of plate cylinder shafts attached to a pair of frames, a plate cylinder held at the tips of the pair of plate cylinder shafts, and an ink pan that is vertically movable below the plate cylinders, A plate cylinder shaft cover provided on each of the frames on both sides of the printing unit so as to surround the plate cylinder shaft, the plate cylinder shaft penetrating so as to be positioned substantially on the same plane as the end surface of the ink pan. And a suction port formed on the end surface of the plate cylinder shaft cover, and a suction means connected to the suction port. Print uni Door of the local exhaust system.