JPH0233306B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blanket cylinder cleaning device for a printing press, and particularly to a cleaning device that is capable of applying a cleaning liquid to a cleaning cloth in an amount necessary for a cleaning operation. The present invention relates to a blanket cylinder cleaning device for a printing press which is suitable for completely removing cleaning liquid from the inside of a tubular member upon operation.

[Conventional technology]

Conventionally, cylinder cleaning devices for printing presses, for example,
As disclosed in JP-A No. 51-56306 and JP-A-54-120008, cleaning is performed by spraying a cleaning liquid from a spray nozzle provided in a tubular member disposed facing the cleaning cloth. It is designed to wipe off deposits by pressing a cleaning cloth against the cylinder.

The cleaning liquid is injected by the Ventury effect when it is discharged from the compressed air nozzle. (For example, see Japanese Patent Publication No. 49-5281.) [Problems to be Solved by the Invention] A tubular member equipped with a nozzle is supplied with cleaning liquid by a high-pressure pump, so the nozzle is always filled with cleaning liquid. , this cleaning liquid is forced out of the nozzle when the pump is activated. Therefore, the tubular member equipped with the nozzle is always filled with an amount of cleaning liquid equal to its internal volume.
Before the tubular member is removed from the printing press, the cleaning fluid must be drained from the tubular member.
This makes the operation considerably more complicated and time-consuming; another disadvantage is that it results in a loss of cleaning fluid. Furthermore, when changing the orientation of the tubular member or inserting it into an inclined location, there is a risk that the cleaning liquid remaining in the tubular member may leak out and damage the printing plates of surrounding mechanical parts. There is sex. Furthermore, under normal printing conditions, there is a drawback that the amount of cleaning liquid forced out from the nozzle cannot be precisely controlled.

SUMMARY OF THE INVENTION An object of the present invention is to provide a blanket for a printing press in which the cleaning liquid introduced into an inlet connecting member common to each of the cleaning liquid and compressed air lines can be pushed out and applied to a cleaning cloth without leaving it inside the tubular member. An object of the present invention is to provide a cylinder cleaning device.

[Means to solve the problem]

To achieve the above object, the present invention provides a cleaning cloth, a mechanism for pressing the cleaning cloth against or separating it from a blanket cylinder, a mechanism for transporting the cleaning cloth, a liquid supply means for supplying cleaning liquid, and a cleaning cloth for cleaning. a tubular member disposed opposite to the cleaning cloth and provided with a hole for pushing out the cleaning liquid toward substantially the entire width of the cleaning cloth; a liquid line for conveying the cleaning liquid from the liquid supply means to the tubular member; and a tubular member for supplying the cleaning liquid to the tubular member. In a printing press blanket cylinder cleaning device consisting of a compressed air line that sends compressed air to be pushed out from the
a common inlet connecting member 14 connecting the tubular member 11 and both lines 15, 17; cleaning liquid measuring means 16, 27 disposed in the liquid line for introducing a certain amount of cleaning liquid into the inlet connecting member; ,
a compressed air supply means 25 disposed in the compressed air line and supplying compressed air for pushing out the cleaning liquid introduced into the inlet connecting member from the tubular member;
After introducing a certain amount of cleaning liquid into the inlet connecting member,
means 28 for controlling the cleaning liquid metering means and the compressed air supply means so that compressed air is sent so that the fixed amount of cleaning liquid is pushed out from the tubular member toward the cleaning cloth in each cleaning operation. be.

[Effect]

When the cleaning operation is started, the cleaning liquid measuring means is operated by the control means, and the cleaning liquid sent from the liquid supply means through the liquid line is adjusted to the amount necessary for the cleaning operation, and is introduced into the inlet connecting member. Thereafter, the compressed air supply means is operated by the control means, and compressed air is supplied from the compressed air line to the inlet connecting member. The cleaning liquid filled in the inlet connecting member is pushed by the compressed air and diffused inside the tubular member, and is then pushed out through the holes in the tubular member toward the cleaning cloth, uniformly wetting the cleaning cloth. . In this series of operations, all of the cleaning liquid that enters the tubular member from the inlet connecting member is applied to the cleaning cloth without remaining inside the tubular member, so that chemical residues of the cleaning liquid, such as calcareous deposits, may be deposited inside the tubular member. does not occur.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rubber blanket cylinder 1 of an offset printing press.
is equipped with a cleaning device 2.

This cleaning device 2 has a frame and a support plate 3.
Both ends are formed by. The frame can be bent somewhat backwards and forwards within the frame of the printing press. The cleaning device 2 is configured to be used together with a cleaning cloth 4 (hereinafter referred to as cleaning cloth). The cleaning cloth 4
The fabric 4 is sent out at a pace from the supply roll 5 and wound onto the roll 6. Between the rolls 5 and 6, the fabric 4 is opposed to the blanket cylinder 1, and in this embodiment, a brush type fabric is used. It passes over the support roller 7 which is said to be The support roller 7 can be moved towards and pressed against the blanket cylinder 1 by rotation of the frame, which has support plates 3 at both ends. On the diametrically opposite side of the point 8 where the brush-type support roller is pressed against the blanket cylinder 1, there is a support member 9 made of a gutter-like metal plate, on which the brush roller 7 is placed.

To supply cleaning liquid to the cleaning cloth 4, a tubular member 11 with a nozzle 10 is used in this embodiment. However, it is not necessarily limited to a nozzle, and it goes without saying that a simple hole may be sufficient as long as the cleaning liquid can be supplied from the tubular member 11. The tubular member 11 is installed at the best location inside the cleaning cloth 4, so that it is shielded from the outside by the cleaning cloth 4, but this prevents it from being exposed to nearby prints. This is a good way to protect each part of the machine from the effects of the cleaning liquid forced out of the nozzle 10. At the same time,
With this configuration, when replacing the cleaning cloth 4, it is only necessary to arrange the cleaning cloth 4 around each part of the system, and eliminates the need to thread it between each part. be. Furthermore, guide crosspieces 12 and 13 are provided for guiding the cleaning cloth 4, which can be connected to the support plate 3 on its sides in order to stiffen the frame if necessary. . The guide cross member 12 also serves as a kind of box for accommodating the tubular member 11 and for receiving the cleaning liquid falling from the tubular member 11.

As made clear in FIG. 2, the tubular member 11 is connected to the inlet coupling member 14. This inlet connection member 14 can be bifurcated to ensure uniform feeding over the entire length of the tubular member 11. At least one (in this example two) liquid lines 17, each having a compressed air line 15 and a pump 16 as its own independent liquid supply means, are connected to the inlet coupling member 14. The compressed air line 15 is further connected to other compressed air lines or sources thereof. here,
Each liquid line 17 is designed to be used for each component of the cleaning liquid provided.
For example, the liquid line on the right in FIG. 2 is designed for water and the liquid line on the left for concentrated cleaning fluid. In order to provide precise control of the amount of cleaning liquid introduced into the tubular member 11, each pump 16 is optimally designed as a piston pump.

Each pump 16 is connected via a suction line 18 to a water tank 19 and to another suction line 1.
8 to the concentrated cleaning liquid tank 20, respectively. A check valve 21 is provided on the suction side and the discharge side of each pump. Compressed air line 15
and liquid line 17 each have a check valve 23 at their connection to inlet connection 14 to prevent dirt and other waste from entering the system.

The inlet connecting member 14 and the tubular member 11 connected thereto can accommodate a certain amount of cleaning liquid, and the space for accommodating the cleaning liquid is designated by reference numeral 2 in the figure.
4. And all nozzles 19
is connected to the space 24. Each pump 16
operates to feed a fixed amount of the adjusted cleaning liquid into the tubular member 11 in synchronization with the movement of the cleaning cloth 4. To this end, in this embodiment the pumps 16 each move one stroke. The dimensions of the pump stroke are optimally adjustable, in order to enable the pump stroke to be precisely adapted to the amount of liquid required in a particular case. In order to ensure that no cleaning liquid is discharged from the nozzle 10 when supplying liquid to the tubular member 11, all pumps 16 are operated with the stroke adjusted to the maximum.
The amount of cleaning liquid delivered by the tubular member 1
1 and the inlet connecting member 14 up to the check valve.

Note that each component of the cleaning liquid is connected to the inlet connecting member 14.
Since they are thoroughly mixed within the tubular member 11 and supplied to the tubular member 11, there is also the advantage that they are supplied to the cleaning cloth 4 in a uniformly mixed state.

After this filling operation, the compressed air line 15 is placed under pressure and the liquid in the tubular member 11 and the inlet coupling member 14 connected thereto is forced out of the hole in the tubular member 11 by the compressed air. For this purpose, the compressed air line 15 is equipped with a valve 25. This valve 25 is controlled by a control device 28
This causes each pump 16 to open as soon as it reaches the end of its stroke. In this embodiment, each pump 16 is operated pneumatically, for which purpose a control spool 27 is provided in each pneumatic supply line 26 which extends to the annular line 22. The spool 27 is controlled by a control device 28 so that the pump 16 starts operating when the compressed air line 15 is blocked, and vice versa when the compressed air line 15 is opened.
is controlled so that it stops. Here, pump 1
6. The valve 27 and the control device 28 constitute a means for adjusting the amount of cleaning liquid introduced into the inlet connecting member 14 to the amount necessary for the cleaning operation, and a means for controlling the supply of compressed air to the valve 25 and the control device 28. are doing. Furthermore, the control device 28 also constitutes a means for controlling the supply of compressed air so that after a certain amount of cleaning liquid is introduced into the inlet connecting member 14, the cleaning liquid is forced out of the tubular member 11 by compressed air.

Typically, one cleaning operation as described above is required for each transfer step of the cleaning cloth 4. but,
If a large amount of cleaning liquid is required, it is also possible to carry out two or more dispensing operations for each step of movement of the cleaning cloth 4.

In addition, for drying the cleaning cloth 4, the tubular member 1 is
1 can be supplied with only compressed air. In that case, pump 16 is stopped for the time required by the control signal and valve 25 is held open.

According to the above embodiment, the cleaning liquid inside the tubular member is
With each cleaning operation, it is completely extracted, so
There is no risk that it will later escape from the tubular member and possibly cause damage due to its chemical nature. Therefore, the work of removing the tubular member from the printing machine, which is required every time the printing plate is replaced, can be easily performed. The use of compressed air maintains the best extrusion of the cleaning liquid, resulting in a uniform distribution of the cleaning liquid. Also, the extrusion holes are self-cleaning due to the high release rate.
Furthermore, a beneficial effect of the use of compressed air is that it can easily be carried out to blow air alone, without cleaning liquid, in order to dry the cleaning cloth to some extent. To do this, the supply of cleaning liquid is simply stopped and the supply of air is turned on for the required time.

In operations in printing rooms, it is often necessary to use cleaning solutions consisting of several components, some of which contain harsh chemicals that can cause damage. This is made possible in a very simple manner by the system of the invention by providing one independent pump for each component. The pump is connected via a liquid line, which is preferably provided with a check valve, to a common inlet connection of the tubular member, to which a compressed air line with a check valve is connected. This ensures that no mixing phenomena occur within the liquid line itself, even if the line is very long.

Furthermore, a piston pump with an adjustable stroke can be used to pump the cleaning liquid,
In this way, a very precisely measured amount of cleaning solution is
It is supplied adapted to the requirements for the operation of the printing press.

〔Effect of the invention〕

As described above, according to the present invention, the following effects are expected.

(a) After a certain amount of cleaning liquid has been introduced into the inlet connecting member, the tubular member Since the cleaning liquid is automatically and completely removed after each extrusion operation, cleaning liquid can be removed even if atmospheric pressure builds up inside the tubular member when the liquid line and inlet connecting member are removed during maintenance or when replacing the cleaning cloth. There is no possibility of dripping from the liquid line connection port or extrusion hole of the inlet connecting member and staining nearby parts. Further, since no cleaning liquid is left inside the tubular member, components of the cleaning liquid, such as calcareous substances, can be prevented from being deposited inside the tubular member, and maintenance of the tubular member is not required.

(b) Cleaning liquid metering means is provided for introducing the amount of cleaning liquid necessary for the cleaning operation into the inlet connecting member, and the metered cleaning liquid is all pushed out toward the cleaning cloth by compressed air, so that the blank The optimum amount of cleaning liquid can be applied to the cleaning cloth according to the dirtiness of the bucket cylinder, and the amount of cleaning liquid can be saved.

(c) Since the cleaning liquid introduced into the inlet connecting member is pushed out by compressed air, the cleaning liquid is pushed out from the inlet connecting member in an extremely uniformly dispersed state throughout the space of the tubular member, so that the cleaning cloth is Wetting becomes uniform and uneven cleaning can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a rubber blanket cylinder cleaning device showing an example of application of the present invention, and FIG. 2 is a circuit diagram showing an embodiment of the present invention as a device for a two-component cleaning liquid. be. DESCRIPTION OF SYMBOLS 1... Blanket cylinder, 2... Cleaning device, 11... Tubular member, 14... Inlet connecting member, 15... Compressed air line, 16... Pump,
17...Liquid line, 25...Valve, 27...
Spool valve, 28...control device.

Claims (1)

[Claims] 1. A cleaning cloth, a mechanism for pressing or separating the cleaning cloth from a blanket cylinder, a mechanism for transporting the cleaning cloth, and a liquid supply means for supplying cleaning liquid;
a tubular member disposed opposite to the cleaning cloth and provided with a hole for pushing out the cleaning liquid toward almost the entire width of the cleaning cloth; a liquid line that sends the cleaning liquid from the liquid supply means to the tubular member; In the blanket cylinder cleaning device for a printing press, the apparatus includes a compressed air line for sending compressed air to be pushed out from the member, the tubular member 11 and both lines 1
A common entrance connecting member 14 that connects 5 and 17.
and cleaning liquid metering means 1 disposed in the liquid line to introduce a certain amount of cleaning liquid into the inlet connecting member.
6, 27, a compressed air supply means 25 disposed in the compressed air line and supplying compressed air for pushing out the cleaning liquid introduced into the inlet connecting member from the tubular member, and a compressed air supply means 25 for supplying a certain amount of cleaning liquid to the inlet connecting member. means 28 for controlling the cleaning liquid metering means and the compressed air supply means so as to send compressed air to force the fixed amount of cleaning liquid from the tubular member towards the cleaning cloth for each cleaning operation; A printing press blanket cylinder cleaning device comprising: