JPH0246388B2 - INSATSUKINOGOMUBURANKETSUTOSENJOSOCHI - 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 printing machine suitable for applying a cleaning liquid to a cleaning cloth in an amount necessary for a cleaning operation. This invention relates to a blanket cylinder cleaning device.

[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 placed facing the cleaning cloth. It is designed to wipe off deposits by pressing a cleaning cloth against the cylinder. The cleaning fluid used for this type of cleaning is a premix of several components, some of which include harsh chemicals that can cause damage.

The cleaning liquid is injected by the Ventury effect when compressed air is discharged from the nozzle. (For example, see Japanese Patent Publication No. 49-5281.) [Problems to be Solved by the Invention] Cleaning liquid is supplied to a tubular member equipped with a nozzle by a high-pressure pump, so the nozzle is always filled with cleaning liquid. be. 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.
Residues of chemical components of the cleaning solution, such as limestone, precipitate and become a factor that clogs the nozzle. Therefore, it was necessary to clean the tubular member regularly. Furthermore, when the tubular member is removed from the printing press, the cleaning liquid must first be extracted from the tubular member. This complicates this task considerably and
Another drawback, which is both tedious and time-consuming, 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 inside the tubular member may leak out and damage surrounding mechanical parts or printing plates. There is sex. Furthermore, under normal printing conditions, the amount of cleaning liquid applied to the cleaning cloth cannot be accurately controlled.

Further, when using a cleaning liquid containing several types of chemicals as components, the cleaning liquid is mixed in advance and tempered and supplied to the tubular member through one liquid line. Therefore, a device for mixing each component and a device for maintaining the tempered cleaning liquid in the same state are required, which poses problems such as making this type of device complicated and expensive.

It is an object of the present invention to introduce a metered amount of cleaning fluid into a common inlet coupling member connected to a plurality of liquid lines conveying the same amount of cleaning fluid and a line conveying compressed air without leaving it inside the tubular member. It is an object of the present invention to provide a blanket cylinder cleaning device for a printing press capable of applying cleaning cloth.

Another object of the present invention is to provide a blanket cylinder cleaning device for a printing press which cleans the inlet coupling member and tubular member by sending compressed air at the end of the cleaning operation.

[Means to solve the problem]

In order 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. a tubular member disposed opposite to the cleaning cloth and provided with holes for supplying cleaning liquid to substantially the entire width of the cleaning cloth; and a liquid line that sends the cleaning liquid from the liquid supply means to the tubular member;
A blanket cylinder cleaning device for a printing press comprising: a compressed air line that sends compressed air for supplying cleaning liquid to a tubular member; a common inlet connecting member that connects the inlet connecting members, a liquid measuring means arranged in each of the liquid lines to introduce a fixed amount of cleaning liquid into the inlet connecting member, and a liquid line that connects the inlet connecting member and each liquid measuring means. a backflow prevention means disposed in the compressed air line for preventing the cleaning liquid introduced into the inlet coupling member from returning to the liquid line; and a backflow prevention means disposed in the compressed air line for pushing the cleaning liquid introduced into the inlet coupling member into the tubular member. a compressed air supply means for supplying compressed air and a fixed amount of cleaning liquid at an inlet connecting member, and then sending compressed air to supply the fixed amount of cleaning liquid from the tubular member to the cleaning cloth for each cleaning operation. A blanket cylinder cleaning device for a printing press, comprising means for controlling each of the liquid measuring means and compressed air supply means.

Another invention is to add means for supplying compressed air for a predetermined period of time at the end of the cleaning operation to the above invention.

[Effect]

When the cleaning operation is started, the liquid measuring means of each liquid line is operated by the control means, and the plurality of cleaning liquids sent from the liquid supply means through the liquid lines are adjusted to the amount required for the cleaning operation, and the liquid is adjusted to the amount required for the cleaning operation, and the liquid measuring means is operated by the control means. are introduced into the inlet connecting member and mixed. 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 measured amount of cleaning liquid filled in the inlet connecting member is pushed by compressed air and diffused into the inside of the tubular member, and is then applied to the cleaning cloth through the holes in the tubular member, evenly distributing the cleaning liquid. wet. 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.

Further, each liquid line is provided with a backflow prevention means, so that the respective cleaning liquids do not mix together in the liquid line. Therefore, in the inlet connecting member, it is possible to easily create a component ratio of the cleaning liquid suitable for cleaning the cylinder.

Furthermore, if a means is provided to supply compressed air for a predetermined period of time after the final cleaning liquid is applied to the cleaning cloth, if there is any cleaning liquid remaining in the inlet connecting member or tubular member, this The cleaning liquid can be reliably removed.

〔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 at which 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 apply 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 even if it is a simple hole, the tubular member 1
Of course, it is sufficient if the cleaning liquid can be supplied from 1. 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 is due to the fact that it is shielded from the outside by the cleaning cloth 4. This is a good way to protect the parts of the machine from the effects of the cleaning liquid forced out of the nozzle 10. At the same time, such an arrangement eliminates the need for the cleaning cloth 4 to be placed around each part of the system when changing the cleaning cloth, without having to thread it between the parts. It is something. Furthermore, guide crosspieces 12 and 13 are provided for guiding the cleaning cloth 4, which can be connected to the supporting 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. A plurality of liquid lines 17 are connected to the inlet connection 14, each having a compressed air line 15 and a pump 16 as a dedicated independent liquid and water supply means. The compressed air line 15 is
Furthermore, it is 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. Here, the check valves 20 and 23 constitute a backflow prevention means that prevents backflow of the cleaning liquid and water after being measured.

The inlet connecting member 14 and the tubular member 11 connected thereto can accommodate a metered 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.
There is also the advantage that the cleaning cloth 4 is supplied in a uniformly mixed state because the cleaning cloth 4 is sufficiently mixed within the tubular member 11 and supplied to the tubular member 11.

After this filling operation, the compressed air line 15 is placed under pressure and the liquid in the inlet coupling member 14 is forced into the tubular member 11 by the compressed air. For this purpose, the compressed air line 15 is provided with a valve 25.
is equipped. This valve 25 is opened by the control device 28 as soon as each pump 16 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 such that, conversely, the pump 16 starts operating when the compressed air line 15 is closed, and stops when the compressed air line 15 opens. Here, pump 1
6. The valve 27 and the control device 28 are means for adjusting the amount of water and cleaning liquid introduced into the inlet connecting member 14 to the amount necessary for the cleaning operation, and the valve 25;
The control device 28 constitutes means for controlling the supply of compressed air. Furthermore, the control device 28 also includes means for controlling the supply of compressed air so that after introducing the measured amount of cleaning liquid into the inlet connecting member 14, the cleaning liquid is applied to the cleaning cloth via the tubular member 11 using compressed air. are doing.

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. In this case, the control device 28 constitutes a means for not only controlling the application of the cleaning liquid to the cleaning cloth but also controlling the removal of the cleaning liquid remaining inside the tubular member and the inlet connecting member at the end of the cleaning operation.

In this case, the control device 28 controls the valve 25 as means for controlling the application of the cleaning liquid to the cleaning cloth as well as the control for removing the cleaning liquid remaining inside the tubular member and the inlet connecting member at the end of the cleaning operation. control.

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, so that a uniform distribution of the cleaning liquid inside the tubular member is obtained.

Also, a beneficial effect of the use of compressed air is that it is easy 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. Thereby, the cleaning liquid remaining inside the inlet connecting member and the tubular member can be completely removed.

Further, by providing a control means for sending compressed air to push the metered cleaning liquid from the tubular member toward the cleaning cloth after the metered cleaning liquid has been introduced into the inlet coupling member, the tubular member Cleaning liquid is automatically and completely removed after each operation.
When the liquid line and inlet connecting member are removed during maintenance or when replacing the cleaning cloth, cleaning liquid may drip from the liquid line connection port of the inlet connecting member or the hole in the tubular member even if atmospheric pressure builds up inside the tubular member. This prevents contamination of nearby parts.

Further, since no cleaning liquid is left inside the tubular member, components of the cleaning liquid, such as calcareous matter, can be prevented from being deposited inside the tubular member, and maintenance of the tubular member is not required.

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) The use of cleaning solutions consisting of several components, some of which contain harsh chemicals that can cause damage,
By providing one independent liquid supply means for each component of the cleaning liquid, this becomes possible with an extremely simple configuration.

(b) Each line is connected to a common inlet connection via anti-backflow means, so that no mixing phenomena occur within itself, even in the case of very long liquid lines.

(c) liquid metering means are provided for introducing the amount of cleaning liquid required for the cleaning operation into the inlet coupling member;
Since the measured amount of cleaning liquid is entirely applied to the cleaning cloth using compressed air, the optimum amount of cleaning liquid can be applied to the cleaning cloth depending on the level of dirt on the blanket cylinder, and the amount of cleaning liquid can be saved.

(d) Since the cleaning liquid introduced into the inlet connecting member is pushed out by compressed air, the cleaning liquid is spread extremely uniformly from the inlet connecting member to the entire space of the tubular member, so that the cleaning cloth is evenly wetted. Then,
Uneven cleaning can be prevented.

(e) By providing a means for supplying compressed air for a predetermined period of time at the end of the cleaning operation, it is possible to completely remove the small amount of cleaning liquid remaining inside the inlet connecting member and tubular member, and to keep the said member clean at all times. can be kept in good condition.

[Brief explanation of the drawing]

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 solution. 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)

[Scope of 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 supplying cleaning liquid to substantially the entire width of the cleaning cloth;
A blanket cylinder cleaning device for a printing press comprising a liquid line for supplying cleaning liquid from the liquid supply means to the tubular member, and a compressed air line for supplying compressed air for supplying the cleaning liquid to the tubular member. a liquid line, a common inlet connecting member that connects the tubular member to a plurality of liquid lines and a compressed air line, and a liquid metering means disposed in each of the liquid lines for introducing a fixed amount of cleaning liquid into the inlet connecting member. a backflow prevention means disposed in the liquid line connecting the inlet connecting member and each liquid measuring means to prevent the cleaning liquid introduced into the inlet connecting member from returning to the liquid line; and a backflow prevention means disposed in the compressed air line. , a compressed air supply means for supplying compressed air for pushing the cleaning liquid introduced into the inlet connecting member into the tubular member; and after mixing a fixed amount of the cleaning liquid with the inlet connecting member, sending compressed air to A blanket cylinder cleaning device for a printing press, comprising means for controlling each of the liquid measuring means and compressed air supply means so as to supply cleaning liquid from the tubular member to the cleaning cloth in each cleaning operation. 2. 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 supplying cleaning liquid to substantially the entire width of the cleaning cloth;
A blanket cylinder cleaning device for a printing press comprising a liquid line for supplying cleaning liquid from the liquid supply means to the tubular member, and a compressed air line for supplying compressed air for supplying the cleaning liquid to the tubular member. a liquid line, a common inlet connecting member that connects the tubular member to a plurality of liquid lines and a compressed air line, and a liquid metering means disposed in each of the liquid lines for introducing a fixed amount of cleaning liquid into the inlet connecting member. a backflow prevention means disposed in the liquid line connecting the inlet connecting member and each liquid measuring means to prevent the cleaning liquid introduced into the inlet connecting member from returning to the liquid line; and a backflow prevention means disposed in the compressed air line. , a compressed air supply means for supplying compressed air for pushing the cleaning liquid introduced into the inlet connecting member to the tubular member, and a means for supplying compressed air to the inlet connecting member for a predetermined time at the end of the cleaning operation;
After mixing a fixed amount of cleaning liquid with the inlet connecting member,
controlling each of the liquid measuring means and the compressed air supply means so as to send compressed air to supply the fixed amount of the cleaning liquid from the tubular member to the cleaning cloth for each cleaning operation;
and a control means for operating the compressed air supply means for a predetermined period of time at the end of a cleaning operation.