JPH0428767Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a plate cylinder cleaning device in a printing unit of a gravure printing machine, which is capable of cleaning the plate cylinder without removing it from the printing unit.

[Conventional technology]

Conventionally, the method for cleaning the plate cylinder after printing is to drip cleaning solvent from above with a roller or the like while rotating the plate cylinder at a low speed immediately after printing, wet the plate surface, and wipe it off with a rag or the like.

[Problem that the invention attempts to solve]

However, this method requires manual work by an operator, and requires successive cleaning of the plate cylinders of a plurality of printing units constituting a printing press, which is labor intensive and time consuming. Additionally, solvent vapor is often inhaled during work, which is unfavorable from a sanitary standpoint. Furthermore, since it is a manual process, more solvent is often used than necessary, leading to problems such as increased costs.

The present invention is an attempt to solve these conventional problems, and is a plate cylinder cleaning method that eliminates the need for operators to directly handle cleaning solvents with their hands and allows plate cylinders to be cleaned without manual work. The purpose is to provide equipment.

[Means for solving problems]

As a result of intensive studies to solve the above problems, the inventor of the present invention has discovered that by spraying a cleaning solvent onto the plate cylinder while slowly rotating the plate cylinder, it is possible to perform good cleaning without removing the plate cylinder. I found out.

The present invention, which was made based on such knowledge, forms a longitudinally extending solvent passage in the impression cylinder safety bar disposed in front of the nip between the plate cylinder and the impression cylinder in the printing unit of a gravure printing press, and A plate cylinder cleaning device characterized in that a plurality of solvent injection nozzles communicating with the impression cylinder safety bar are provided along the longitudinal direction of the impression cylinder safety bar, and a pipe for supplying cleaning solvent is connected to the solvent passage of the impression cylinder safety bar. The gist is:

[Effect]

In the above calibration, the impression cylinder safety bar is located in front of the nip between the plate cylinder and the impression cylinder during printing, and acts to prevent fingers, etc. from getting caught between the two, and when cleaning the plate cylinder after printing is completed. The cleaning solvent is sprayed onto the plate cylinder from the solvent injection nozzle to clean the plate cylinder. In this way, automatic cleaning of the plate cylinder becomes possible. Furthermore, since the impression cylinder safety bar is provided with a solvent injection function, there is no need to provide a separate solvent injection means, and the structure of the printing unit is simplified.

〔Example〕

Embodiments of the present invention shown in the drawings will be described below.

FIGS. 1 and 2 are schematic diagrams of a printing unit equipped with the plate cylinder cleaning device of the present invention. FIG. 1 shows the printing unit during cleaning, and FIG. 2 shows the printing unit during normal printing. In FIGS. 1 and 2, 1 is a plate cylinder, 2 is an ink pan, 3 is a fannisher roller that contacts the plate cylinder 1 with appropriate contact pressure, and 4 is a fannisher roller that transfers ink at the bottom of the ink pan 2 to the fannisher roller 3 and the plate cylinder. 1, an ink circulation system, 5 an ink pump, 6 a doctor holder holding a doctor blade 7, 8
9 is an apron suspended below the doctor holder 6; 9 is an impression cylinder that contacts the plate cylinder 1 with appropriate pressure; 1;
0 is a swinging arm that holds an impression cylinder. The swinging arm 10 holding the impression cylinder 9 further includes an impression cylinder safety bar 11.
is held. The mounting position of the impression cylinder safety bar 11 is such that it is located in front of the nip between the plate cylinder 1 and the impression cylinder 9 when the impression cylinder 9 is pressed against the plate cylinder 1, as shown in FIG. It is determined. Note that the impression cylinder safety bar 11 does not necessarily need to be held by the swing arm 10, and may be held by other suitable holding means.

The impression cylinder safety bar 11 is made of a hollow structure such as a pipe, and has a solvent passage inside. Further, as shown in FIG. 3, along the longitudinal direction of the impression cylinder safety bar 11, a plurality of solvent injection nozzles 12 are provided which communicate with the internal solvent passage. The solvent injection nozzle 12 may be formed by simply making a small hole in the circumferential surface of the impression cylinder safety bar 11, or may be formed by attaching a commercially available injection nozzle. As shown in FIG. 1, the solvent injection nozzle 12 is arranged at a position where it can inject a solvent onto the plate cylinder 1 when the impression cylinder 9 is separated from the plate cylinder 1. As shown in FIG. 3, a solvent supply pipe including a flexible hose 13, a valve 14, a pump 15, etc. is connected to one end of the impression cylinder safety bar 11. In addition, the solvent supply piping includes a blower 16,
An air supply pipe including a valve 17 is connected.

Next, the operation of the above device will be explained. During normal printing, as shown in FIG. Protected from being pinched. Further, at this time, the doctor blade 7 contacts the plate cylinder 1 and scrapes off ink from the plate cylinder, and the apron 8 prevents the scraped ink from scattering around.

After printing is completed, the plate cylinder is cleaned using the following steps. Note that the following steps may be performed manually or automatically.

(1) Preparation for cleaning As shown in Figure 1, raise the impression cylinder 9 and doctor blade 7 to a position that does not interfere with plate cylinder cleaning.
The residual ink in the ink pan 2 and the ink circulation system 4 is removed.

(2) Rough cleaning While slowly rotating the plate cylinder 1 with the polisher roller 3 pressed against the plate cylinder 1, a cleaning solvent is supplied to the impression cylinder safety bar 11 by the pump 15.
The supplied cleaning solvent is sprayed onto the plate cylinder 1 from the solvent injection nozzle 12 to clean the plate cylinder. After spraying the plate cylinder to some extent, the supply of cleaning solvent is stopped. On the other hand, the ink pump 5 of the ink circulation system is driven to supply the cleaning solvent accumulated at the bottom of the ink pan 2 between the fine print roller 3 and the plate cylinder 1.
Rough cleaning of the plate cylinder is also performed by rubbing the plate cylinder with the polisher roller 3. Rough cleaning using the fine print roller 3 and the ink pump 5 continues even after the injection from the impression cylinder safety bar 11 is stopped.

(3) Rinse cleaning After the above-mentioned rough cleaning has been sufficiently performed, the ink pump 5 is stopped, and at the same time, cleaning solvent is supplied to the impression cylinder safety bar 11, and the solvent is injected from the solvent injection nozzle onto the plate cylinder. Clean the area. At the beginning of this rinsing cleaning, the finessing roller 3 is pressed against the plate cylinder 1, and then the finessing roller 3 is separated from the plate cylinder 1, and the rinsing cleaning is continued.

(4) Removal of residual solvent in the piping After rinsing is completed, the blower 16 is operated to send air into the solvent supply piping to discharge the residual solvent in the piping and the impression cylinder safety bar 11, and also to remove the solvent in the ink pan 2. Also discharges. This completes the cleaning operation.

In the above embodiment, the cleaning solvent was supplied to the impression cylinder safety bar 11 by the pump 15, but as shown in FIG. Alternatively, the solvent may be supplied to the impression cylinder safety bar 11 by means of a head. Furthermore, in the above embodiment, rough cleaning is performed by pressing the finesse roller against the plate cylinder and rubbing the two together, but the rough cleaning by the finesse roller is omitted, and all cleaning is carried out.
This may be done by spraying a cleaning solvent from the impression cylinder safety bar 11. However, it is preferable to use a finesse roller as in the embodiment, since the amount of cleaning solvent used can be reduced.

[Effect of idea]

As explained above, according to the present invention, the impression cylinder safety bar placed in front of the nip between the plate cylinder and the impression cylinder is provided with a cleaning solvent spraying function, so that the impression cylinder safety bar is provided with a cleaning solvent injection function. Cleaning solvent can be sprayed onto the plate cylinder from a bar to clean it, making it possible to clean all printing units at the same time without having to manually wipe the plate cylinder as required in the past. Become. Therefore, the plate cylinder cleaning operation becomes easy and simple, and the working time can be significantly shortened. Also, the operator can leave the printing unit during cleaning, and the working environment is improved. Furthermore, since the solvent injection nozzle is installed on the impression cylinder safety bar, the structure is simpler than when the solvent injection nozzle is provided separately from the impression cylinder safety bar, and no extra space is required, making the equipment more compact. It also has the effect of being able to

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic diagrams of a printing unit equipped with the plate cylinder cleaning device of the present invention. FIG. 1 shows the printing unit during cleaning, and FIG. 2 shows the printing unit during normal printing. Third
The figure is a schematic diagram showing the impression cylinder safety bar 11 and the piping system therefor, and FIG. 4 is a schematic diagram showing a modification of the piping system. 1... Plate cylinder, 2... Ink pan, 3... Punisher roller, 4... Ink circulation system, 5... Ink pump, 9... Impression cylinder, 10... Swinging arm, 1
1...Impression cylinder safety bar, 12...Solvent injection nozzle.

Claims (1)

[Scope of utility model registration request] In the printing unit of a gravure printing press, a longitudinally extending solvent passage is formed in the impression cylinder safety bar disposed in front of the nip between the plate cylinder and the impression cylinder, and a plurality of solvent injection nozzles communicating with the solvent passage are pressurized. A plate cylinder cleaning device, characterized in that a cylinder safety bar is provided along the longitudinal direction, and a pipe for supplying a cleaning solvent is connected to a solvent passage of the impression cylinder safety bar.