JPS5824276B2 - Cleaning equipment for printing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for a printing press, and more particularly to a liquid spraying device used as a cleaning device attached to an ink roller of a printing press.

Common attempts to clean print rollers intermittently are 1
No. 2,970,541 to W. Gegenheimer, issued February 7, 1961.

This patent discusses, for example, jetting a solution onto a roller to be cleaned and then applying a scraping blade over the surface of the roller to remove dissolved ink and residual solution. ing.

Further advances in this procedure have employed a fixed array of spray nozzles to conveniently apply the solution to an extended area of the print roller that is desired to be treated at a given time. .

However, this otherwise desirable and convenient approach has the potential for undesirable dripping of residual solution trapped in the spray nozzle after the scraping portion of the cleaning operation is completed. was there.

When such dripping occurs, solution accumulates on the ostensibly clean surface of the roller, thereby adversely affecting subsequent printing operations.

It has been recognized that the purpose of this invention is to actively terminate the supply of solution to the injection nozzle orifice at the end of stretching the first chamber.

A special device for this purpose is U.S. Pat.
It is described in 08,71.1.

The device proposed by that patent includes a needle valve with a set of spring seats, each member of which is associated with a special injection nozzle and connected to the nozzle assembly. It is designed to be closed except when pressurized solution is present in the solution supply system.

Furthermore, the solution pressure in the injection system is controlled by a suitable valve arrangement.

Accordingly, one detailed control device has a pneumatically actuated bellows that, when air is in communication with the bellows, pressurized solution reaching the nozzle valve forces the valve open. , also terminates the flow of solution if the air is cut off, simultaneously relieving the pressure in the nozzle supply system and allowing the individual nozzle valves to close.

Although the device described so far does prevent almost continuous leakage of solution from the various nozzles, the small residual solution retained in each nozzle opening even after the solution supply has ended may cause It is not possible to prevent the formation of individual drops.3 If even one such drop falls onto a critical area of the printing roller, the print will be defective, and it is desirable to find additional safeguards.

The present invention solves this remaining problem by creating a negative pressure on the supply line side of each injection orifice at the end of each solution supply cycle,
The solution is to provide a device that sucks any residual amount of solution that was occupying or around the orifice opening into the back of the orifice (actually into the back of the supply system).

Thus, according to the invention, there is provided a liquid source, an orifice through which the liquid is injected, and a printing machine to be cleaned extending between said liquid source and said orifice and ensuring a liquid connection therebetween. A cleaning device for a printing press comprising a liquid dispersion device having a blue system for conveying cleaning liquid to a part, the liquid dispersion device having a control device integrated in the upper part of the blue system, the control device comprising: an expandable first chamber;
a second chamber having a larger volume than the first chamber and interconnected to expand and contract in an opposite relationship to the chamber; and in the blue system, the liquid source and the first and second chambers a multi-position valve connected between the liquid source and the first position, the multi-position valve having a first position and a second position, and when in the first position, the liquid source supplying liquid to the chamber, thereby expanding the first chamber and contracting the second chamber to direct the liquid contained in the instep of the second chamber toward the orifice. extrusion, said second
position, interconnecting the first and second chambers and disconnecting them from the liquid source, thereby causing an extension of the larger volume second chamber and a smaller volume expansion. By simultaneously contracting the first chamber of the blue system, a negative pressure is generated in a portion of the blue system connected to the orifice, and the remaining liquid is sucked from the orifice. A cleaning device for a printing press is provided.

Further details of the invention will become apparent by reference to the following description taken in conjunction with the accompanying drawings.

In FIG. 1, a liquid dispensing device is shown diagrammatically, comprising a pressurized liquid source 10 and an outlet nozzle 15 at the right end of the figure, which nozzle is connected to an orifice 15.
a, such that liquid from the liquid source can be ejected in a controllable manner.

In the newspaper printing application to which the present invention is primarily concerned, the liquid source 10 is a cleaning solution (e.g. a petrochemical derivative).
The tank is maintained under pressure, such as by a source of compressed air (not shown) associated with the tank.

In this embodiment, nozzle 15 may be one of several similar nozzles connected to manifold 17.

The manifold, shown in cross-section, has a suitable axial extension along its length with a series of spaced apart nozzles corresponding to the shape and function of the nozzles 15. It may also have the following.

Adjacent to the nozzle 15, at the end of the figure, a fragment part 20 is shown, which may be considered an ink roller.

As can be readily appreciated, such rollers, under normal conditions of use, tend to accumulate ink which must sometimes be removed by cleaning operations.

In this connection, the nozzle 15 (and similar additional nozzles associated with the manifold 17) sprays cleaning solution onto the roller surface from time to time and for periods of time selected by the operator of the printing device. Has a function.

Associated with the roller 20 is further shown a scraping blade 25 which is moved into contact with the surface of the roller by a controlled operation of the operator of the device and removes the jet from said surface. Scrape off the mixture of solution and undissolved ink resulting from the operation.

The removed material is collected in the upper part of the trough 27 and treated by suitable equipment.

A complete roller cleaning device employing cleaning elements such as those hitherto referenced is disclosed in the aforementioned U.S. Pat. No. 2,970,541.
, which is also incorporated by reference in the first part of the specification.

As previously indicated, jetting and scraping operations are currently widely employed in printing technology.

However, as also mentioned above, these operations have the problem that solution drips from the spray nozzles that have been employed hitherto even after cleaning, with the result that subsequent printing operations are adversely affected.

Although not yet described, what is shown in FIG. Control the flow of liquid through it to eliminate the dripping problem mentioned above.

Generally speaking, the fluid control system employed by the present invention includes a piping section 30 that connects from a liquid source 10 to a manifold 17 and through the manifold to a nozzle 15.
It consists of a device for alternately establishing a fluid flow up to a point in time, and then a device for interrupting the reading flow at desired time intervals under the control of a suitable periodic device.

A further device is coupled to the device just described, which device creates a negative pressure in the piping section 30 when the fluid flow to the manifold 17 is interrupted, causing the injection nozzle 15 to It serves to draw the remaining fluid from the orifice.

The term "negative pressure," used here in its broadest sense, refers not only to a pressure sufficiently below atmospheric pressure to create a suction flow through the nozzle orifice, but also to mean a It also means a pressure that is sufficiently lower than the pre-existing pressure to induce or allow a positive suction flow of fluid through the injection orifice, even under the influence of a substance.

In the particular embodiment shown in FIG. 1, the control system generally described above includes a combination piston assembly designated generally at 35.

The assembly is shown in longitudinal section and has a generally cylindrical shape as seen from the end.

The assembly thus includes disc-shaped end plates 37 and 38, which are connected by a set of symmetrically arranged connecting rods 40, only two of which are shown. .

A first cylinder 42 and a second cylinder 44 are compressively held in an end-to-end relationship between the end plates, and the second cylinder has a diameter smaller than that of the first cylinder. is large enough.

The cylinders 42 and 44 are separated at their nearest ends by a disk 46, each cylinder having a
It presses against the disc in the circumferential direction as shown at 48 and 50, respectively.

Centrally located within the cylinder 42 is a smaller piston-forming cylinder 52, the distal end of which is a circular cylinder head 54 at its left end.

A flexible aluminum roll-up diaphragm 56 extends over the outer surface of the cylinder head, and the diaphragm may be made of a woven fabric impregnated with a direct liquid resistant material;
Its functions will be explained in detail later.

When the piston cylinder 52 is in the position shown, the diaphragm 56 extends over the piston head and is folded back in an annular manner at the annular spacing between the cylinders 42 and 52, as shown at 56a. ing.

The circumferential end of the diaphragm is an enlarged bead 56b, which is held compressively between the end plate 37 and an annular ring 58, which is also connected to the cylinder 42.
It also serves as a center holding device for

Threaded fixation member 62 to other parts of the piston structure
A circular cover plate 60 having a diaphragm 56 is in compressive engagement with the central portion of the diaphragm 56 and presses the diaphragm snugly against the outer surface of the cylinder head 54.

As will become apparent, the end plate 37 and the diaphragm 56
The gap between the opposing faces of the piston cylinder 52 forms a collapsible (and extensible) chamber whose volume is determined by the piston cylinder 52 for purposes described hereinafter.
can change depending on the movement of

A connecting rod 65 extends in the axial direction of the piston cylinder 52, and the connecting rod is connected to the cylinder head 54 by a screw 62.
is fixed.

The connecting rod passes through the dividing wall 46 and is slidably supported in the center of the wall by a bushing 70.

On the right side of the wall 46, the connecting rod is located in an axial position in the second piston cylinder 75, the right end of which is a cylinder head 80, which connects the connecting rod 65. It is held in place by a mounting member relative to the end.

A flexible roll-up diaphragm 83 is attached to the outer surface of the cylinder head, and the diaphragm is further tightened to the cylinder head by a circular cover plate 84 held in place by screw members 86. .

The diaphragm 83 has a similar structure to the diaphragm 56 described above, and similarly to the diaphragm, the end portion facing the field is an enlarged bead 83b.

As shown in the figure, the bead portion has a grooved tightening ring 9.
0 to the circular end wall 38.

The entire structure described so far is held in a disassembly manner by the aforementioned connecting rod 40.

In view of the operation of the control device, the end plate 37 has an inlet/outlet 95 through which liquid can flow into and from a space otherwise generally sealed by the flexible diaphragm 56. You need to be careful that you can be pulled out.

Similarly, the opposite end wall 38 has an inlet/outlet 99 through which liquid can enter or be withdrawn from the chamber bounded by the second diaphragm 83.

Also, at this point, the space volume within the diaphragm 83 which is in the completely ``inflated'' state as shown in FIG. 1 is now in the completely ``inflated'' state as shown in FIG. 2. It is also important to note that the corresponding spatial volume within diaphragm 56 is much larger.

This makes it possible to properly consider the next operational step and its practical consequences (regarding the usability of the invention), which is to change the device from the state shown in FIG. 1 to the state shown in FIG. I can do it.

In this regard, attention is first drawn to the two-position slide valve 110 shown schematically in FIGS. 1 and 2.

The valve is shown (also illustratively) to include an outer sleeve 110a within which a two-chamber, closed-ended cylinder 110b is slidably mounted.

For convenience of reference hereafter, the two chambers of the cylinder will be referred to as A and B.

When the cylinder 110b is in the position shown in FIG.
The passage of liquid from the pressurized liquid source 10 is substantially obstructed.

However, in this state, the chamber B communicates with the inlet/outlet 95 connected to the inside of the diaphragm 56 and the inlet/outlet 99 connected to the inside of the diaphragm 83.

This communication is provided by a communication pipe 120 extending between the inlet/outlet 95 and a hole 122 in the valve chamber B, a hole 124 in the valve chamber B, and an end plate 3.
8 and another connecting tube 126 connecting the opposite end 126a connected to the inlet/outlet 99 formed in the tube.

Here, the pipe 126 also connects to the manifold 1 via the branch pipe 30.
7, and is connected to an orifice 15a through the manifold and the connecting nozzle 15, from which the solution is finally injected.

Assume now that a certain amount of solution liquid has been previously introduced into the chamber in the diaphragm 83, as indicated at 130, by a device to be described later.

Also at this point, the two-chamber valve cylinder 110b is axially movable under the combined control of a tension spring 135 and a solenoid shown diagrammatically, which is connected to a magnetic core or plunger. 138 and excitation coil 1
Please also note that it consists of 39.

When the device is in the state shown in FIG. 1, the solenoid coil 139 is assumed to be in a non-energized state, but its terminal 140 is connected to a power source (see FIG. 3) that can be energized. Let's assume that it is.

Under such conditions, when the terminal 140 is now energized, the valve cylinder 110b is pulled to the right by the solenoid, as shown in FIG. will provide a direct connection between the pipe 10a extending from the recirculating pressure liquid source 10 and the pipe 120 leading to the inlet/outlet 95 communicating with the inside of the diaphragm 56.

At the same time, the connection between the left end of tube 126 and tube 120 will be severed.

In such a condition, the pressurized liquid
6 and, in due course, will move the piston cylinder 52 to the position shown in FIG.

In such a process, the liquid is subject to, among other things, the drag of the compression spring 150, which also stores potential energy to perform other functions as described below. It will be.

Because when the spring 150 is compressed, undesirable torsional motion occurs in the parts associated with the spring (which necessarily includes the diaphragm 56), the right end of the spring is fitted with a friction-resistant thrust bearing assembly. 155 so that the end of the spring is free to rotate, so that no torsional forces are applied to the diaphragm j.

The movement of the piston cylinder 52 to the right will then cause a corresponding movement of the connecting rod 65, and a similar movement of the piston cylinder 75 and its associated cylinder head 80.

As can be seen from FIG. 2, this compresses the space within the diaphragm 83, and the degree of compression is defined by the position of the joining member 160, which is
As shown, it is adjustable to accommodate various operating situations.

The holes 165 formed in the dividing plate 46 ensure that air in any space within the device is not obstructed in its flow, so that the operation of the piston described so far is as simple as possible.
1. Be aware of the fact that you will no longer be criticized.

It can be easily seen that when the parts move in the manner described above, the liquid 130, shown as being confined by the diaphragm 83 in FIG. Probably.

Furthermore, in this case, since the left end of the limb tube 126 is closed (see FIG. 2), the three liquids necessarily flow into the manifold 17.
and will be injected through nozzle 15 and orifice 15a.

This resulting jetting action continues until the stored liquid is completely discharged, or until the piston cover plate 84
will continue until reaching the limiting joint member j160.

The amount of cleaning liquid measured in this way is applied to the ink roller 2.
0, and as a natural order, the scraping blade 2
5 (along with the dissolved ink).

Under normal conditions of use, four jetting and scraping cycles are generally employed in succession, so that the fluid control device can perform various operating functions multiple times during any cleaning operation. Although intended to be accomplished, this is not necessarily an effective use of the invention.

Regardless, even if one or more injection cycles are employed, the present invention de-energizes the solenoid so that the tension spring 135 can return the two-chamber valve cylinder 110b to the position shown in FIG. The intention is to bring the given cycle to an end by doing so.

Under this condition, valve ports 122 and 124 are opened again, and openings 95 and 99 are therefore directly connected via connecting pipes 120 and 126.

At the same time, opening 95 will be disconnected from pressurized liquid source 10.

Once the conditions described above are reached, the compression spring 150 acting within the piston cylinder 52 will move the cylinder to the left, thus compressing the diaphragm 56.

Due to this action, the cleaning liquid 130b stored in the closed space defined by the diaphragm is first
It will be forced through the connecting tubes 120, 126 and 126a and then through the opening 99 into the closed chamber defined by the diaphragm 83 at the right end of the control device.

As previously explained, the chamber is substantially larger than the corresponding closed chamber defined by the diaphragm 56;
When the diaphragm 83 is fully inflated (i.e., in the position shown in FIG. 1), the chamber is substantially evacuated;
The chamber can simply be filled by air entering through the nozzle 15.

By this action, irrespective of the orientation of the nozzle, droplets or particles of soap are effectively sucked into the nozzle and into the upper part of the tubing system, where they would otherwise accumulate near the orifice and become critical to the printing equipment. It will drip continuously onto the surface.

Such solution suction is particularly effective when the nozzle is oriented downwardly, but is also effective regardless of the particular nozzle orientation employed.

In some cases, the nozzle orifice is oriented upwardly so that liquid collected on the lip of the orifice naturally (ie, under the influence of gravity) flows back into the nozzle.

However, in such a case, the invention is still effective, i.e. the volume of liquid accumulated in the tube sections 126 and 126a is only inherently reduced by the invention, and siphon effects or other The action of facilitates the withdrawal of excess fluid from near the orifice.

The construction of the apparatus shown in FIGS. 1 and 2 is such that a single pressurized fluid (i.e. the cleaning solution itself) compresses a piston represented by cylinder 52 and supplies solution to injection nozzle manifold 17. It has a special advantage in that it serves two functions:

However, it will be appreciated that if for some reason a separate source of motive power for the piston cylinder 52 may be used, such as a valve-controlled pressurized air flow or other fluid medium. Dew.

From this point of view, the main requirement of the invention is that the volume of the chamber represented by the fully expanded diaphragm 83 is greater than the volume of solution introduced into the shell of the tubing system when the diaphragm is compressed. It is a must.

When this condition is met, when the diaphragm is re-inflated by the force of compression spring 150, communication between the diaphragm chamber and the nozzle manifold (e.g., as shown in FIG. 1) is maintained. If unrestricted, it will create a negative pressure at the nozzle orifice with the advantageous results described above.

In order to obtain the above-mentioned results, it is of course not essential that the difference between the dimensions of the two collapsible chambers be as great as shown in FIGS. 1 and 2.

In fact, for special purposes, and especially when low cost is essential, the rod side chamber and head side chamber of a typical double-acting piston cylinder may be employed for the purposes of the present invention; In this case, the maximum volume of the rod side chamber is necessarily smaller than the maximum volume of the head side chamber by subtracting the rod's own volume from the volume of the chamber.

In the apparatus of FIGS. 1 and 2, the diaphragm 83
The function of introducing an amount of liquid into the closed space defined by , which incompletely fills the space, is achieved in the following manner.

When the diaphragm 56 is fully expanded as shown in FIG. 2, it is necessarily filled with a certain amount of pressurized solution, which, as previously described,
Expand the diaphragm.

Furthermore, the volume of liquid 130b so stored is significantly smaller than the expanded volume of the closed space defined in the latter diaphragm, due to the special relationship between the dimensions of the two diaphragms 56 and 83. .

Therefore, when the solenoid coil 139 is de-energized and the valve system is returned to the position shown in FIG.
Due to the action of
and through the opening 99 in the wall, it will be forced into a relatively large chamber in the process formed by the expanded diaphragm 83.

Thus, as shown in FIG. 1, the chamber is partially filled again, with the amount of liquid deposited in the chamber being scaled by the dimensions of the diaphragm 56.

In the apparatus so far described, the injection cycle, which ends with removal of the remaining solution from the injection orifice, can be repeated as many times as desired.

If it is desired that the injection and scraping cycles be continuous, this can be done automatically by using a suitable timing mechanism.

For purposes of illustration only, a typical timing mechanism is shown diagrammatically in FIG.

When reading the diagram, the terminal 140 of the solenoid coil 139 (
1) is shown coupled to a power supply 180, the use of which is controlled by a switch 185, which when closed causes the low speed motor 1 to
90 begins to rotate, thereby causing the contact rate 200 to rotate.

A conductive member 205 is spaced apart around the outer periphery of the vehicle, and conductive parts 210 and 215 are intermittently brought into contact with each other, thereby energizing the coil 139 periodically.

By appropriate spacing and dimensions of the contactors 205 and/or rotational speed of the output shaft of the motor 190,
The timing of the important part of the switch period can be set as desired.

The switch 185 also controls the operation of the injection mechanism and the roller 20.
It may be electronically controlled to provide an interlock between the rotation of the scraping blade 25 and the device controlling the action of the scraping blade 25.

Although the invention has been described with reference to specific embodiments,
Various modifications are possible without departing from the basic principles.

The appended claims embrace all such modifications as fall within the spirit and scope of the invention.

[Brief explanation of the drawing]

1 is a partially sectional and partially schematic representation of a fluid distribution device according to the invention; FIG. 2 shows the main functional elements shown in FIG. 2 in another operating state; FIG. 3 is a schematic diagram of a typical control circuit for use with the apparatus of FIG. 1. In the figure, 10...pressurized liquid source, 15...
・・Refuse, 35 ・・・Control device, 52 ・・・
... Piston cylinder, 56 ... First chamber, 83 ... Second chamber, 110 ... Valve device.

Claims (1)

[Scope of Claims] 1. A liquid source 10, an orifice 15 from which the liquid is injected, and an orifice 15 extending between the liquid source and the orifice to ensure a liquid connection therebetween for cleaning. In a cleaning device for a printing press, the cleaning device includes a liquid spraying device having a blue line 126 for conveying the cleaning liquid to a printing press portion to be cleaned.
The liquid dispersion device has a control device built into the upper part of the blue system, and the control device includes (a) a first expandable and retractable chamber 56; and (b) an opposite chamber in the first chamber. a second chamber having a larger volume than said first chamber, interconnected to expand and contract in relation to said first chamber;
(c) a multi-position valve 110 connected between the liquid source and the first and second chambers in the blue system;
One solution to this problem is that the multi-position valve has a first position and a second position, and when in the first position, supplies liquid from the liquid source to the first chamber. teeth,
As the ejection cycle progresses, the second chamber is contracted and the liquid contained in the second chamber is pushed out toward the orifice, and when in the second position, the first and second interconnecting the chambers and disconnecting the chambers from the connection with the liquid source, such that the expansion of the second chamber with a larger volume and the contraction of the first chamber with a smaller volume occur simultaneously. As a result, a negative pressure is generated in the portion 30 of the blue system connected to the orifice, and the remaining liquid is sucked from the orifice. A cleaning device for a printing press characterized by: