JPS60127155A - Humidifier and humidifying method in lithographic press - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a lithographic printing press.
The present invention relates to a new and improved heating device for use in heating systems. Generally, the present invention relates to a new and improved continuous contact heating device, but is not necessarily limited to one particularly useful in lithographic printing presses. More particularly, the present invention relates to a new and improved warming system for a dampening fluid reservoir in a lithographic printing press where the holding roller and plate cylinder have different surface velocities. The warming device reduces ghosting, eliminates hickey, reduces ink backflow into the dampening fluid, and improves printing performance.

Since the conventional offset printing plate 1 is chemically treated, there are printed parts and non-printed parts, and ink adheres to the printed parts. On the other hand, the non-printed areas are hydrophilic and accept dampening fluid. To achieve the desired print, a coating of dampening liquid is applied to the surface of the plate, where the dampening liquid is retained in the hydrophilic areas (non-printed areas), but is repelled from the printed areas, and is removed from the printed areas. Printing ink adheres to the surface. However, the non-printed areas do not receive printing ink due to the dampening solution II. In this way, only the image of the printed portion is transferred to the blanket cylinder and then to the paper on which it is printed.

Generally, there are two types of warming devices: contact and non-contact warming devices. The non-contact type heating device is a brush and spray type device (j6), and this type of device includes:
There is a physical gap in the path for the dampening fluid to reach the plate. In such devices, the ink does not flow back into the sintering fluid of the warming device.

There are two types of contact feed/ff11 devices. namely, continuous-type devices and conventional or doctor-type devices that use cloth-covered foam rollers or intact phono, rollers.

Continuous heating devices are generally preferred as they provide high quality printing and are relatively low maintenance since they do not require cloth or paper covered rollers. However, a drawback of continuous heating devices is the problem of ghosting in the printed material.

Continuous feed devices can be classified into three groups: plate feed devices, ink roller feed devices, and combinations thereof.

In plate-fed p-type machines, the dampening fluid is applied directly to the plate by a series of rollers independent of the inking unit. Such devices include a roller in contact with a supply of dampening fluid, which is transferred via an intermediate roller to a dampening foam roller. The dampening foam roller rotates in contact with the plate cylinder, thereby transferring the dampening foam. Another series of rollers, including an in-form roller and a U-oscillating roller, transfers the ink to the platen cylinder.

The inking roller feed type device operates in such a way that the dampening liquid is sent to one of the rollers of the inking unit rather than to the plate.

Typically, dampening fluid is directed to a first ink form roller.

The combined type of device is provided with a dampening foam roller 9 at 111 which supplies the dampening liquid to the plate. In the combined version, the dampening roller is connected to the inking device by a vibrating bridge roller. One typical example of a combination device is U.S. Pat.
, 290.36o.

Continuous ink roller feeding warmers are widely used in the printing industry, although improvements would be desirable. Ink roller feed continuous type heating device 1
One problem is that the setting of the edge of the vibrating roller that feeds the first ink form roller and the setting of the type of the first ink form roller that feeds the platen cylinder are very important. This setting is important because the first ink form roller rotates at substantially the same speed as the plate cylinder and is frictionally driven by the vibrating roller and plate cylinder. In some cases, for example in sheet-fed printing machines, there is a large gap in the plate cylinder, so that when the plate cylinder rotates, the four
There is a time limit in which only the first form roller is driven by frictional contact. This is a problem because the dampening fluid on the surface of the roller will slip, making contact and driving difficult.

Furthermore, the slip nip between the rollers (5 lip nip
) acts as an additive force that decelerates the roller. In order to rotate the foam roller at the same speed as the vibratory roller, it is generally believed that it is necessary to maintain a relatively large profile between the vibratory roller and the first ink form roller. If this mold is not heavy enough, or if the platen cylinder mold is very heavy, speed changes will occur, resulting in poor printing. However, a heavy version of the vibrating roller is required and does not provide good ink transfer due to mechanical ghosting problems. As described herein, mechanical ghosting is the appearance of undesirable overprint images in printed areas.

A ghost is a faint image of a transfer of another printed area or of a portion of an area of the same printed area.

The cause is the same for both mechanical ghosts and relates to the principle of suppressing the transfer of ink from the ink roller to the print in a printing press. That is, when the inking roller transfers ink to the printing plate, a symmetrical image of the printed area is formed on the inking roller. The boundary line of this symmetrical image is the area M(i) of the symmetrical image of the roller that contacts the plate and transfers the ink to the plate σ) (=J) and transfers the ink (=J) to both image areas, and the area M(i) of the symmetrical image of the roller that contacts the plate and contacts the non-image area of the plate. to receive the liquid without transferring all the ink.
It represents a line that divides the area (11) of the symmetrical image of the eyebrow roller.

Therefore, the ink foam roller (the one in contact with the plate cylinder) contains areas of thin ink film and little dampening fluid and areas of thick ink film with a lot of emulsified water and prints This causes an undesirable overlapping image in the image.

Ink roller feed type warming devices have been widely used in the printing industry for about ten years. One typical ink roller feed type warming device is disclosed in U.S. Pat. No. 3,168,037.

These devices have the advantage of requiring less maintenance, for example because the rollers do not have to be made of cloth or paper. Due to the very fast response time when the device is put into operation, very few sheets are wasted due to wastage and fewer people are required to operate it.

In a typical ink roller feed warming device, the dampening armpit is metered into a relatively thin coating by a metering nip formed between a chrome transfer roller and a resilient metering roller. Generally, these rollers are intermeshed and driven at the same surface speed by separate transmissions. Since the rollers rotate at the same surface speed, the thickness of the dampening fluid film at the exit of the nip is determined by the speed of the rollers, the stiffness of the elastic roller, the pressure between the rollers, and the viscosity of the dampening fluid. .

Generally, all of these factors are constant except the speed of the rollers, so the dampening fluid thickness at the exit of the metering nip and the dampening fluid delivery speed are dependent on the speeds of the transfer roller and the elastomer roller. can be changed by using a speed controller to change the speed.

A metered coating of dampening fluid advances to the nip between the first ink form roller and the transfer roller, and some of the dampening fluid enters the first
Transferred from the form roller to the plate cylinder. The transfer roller and metering roller rotate at a slow speed and a "slip nip" is formed at the contact between the transfer roller and the first form roller.

The above-mentioned equipment includes, except in the case of very small printing presses,
It has been found that a beveled metering roller is generally required so that the dampening fluid feed rate is greater at the ends of the roller than at the center. Furthermore, isopropyl alcohol/I/k 7N must be added to the solution, and this isopropyl alcohol does not clump up towards the small water droplets, creating a thin coating! I know that I will remain.

Another opening of the device is that when the printing press is driven at high speed, the slip nip causes an emulsification of the dampening fluid and the ink, dispensing the ink particles back into the dampening fluid and printing. An effect known as tinting occurs in which the non-image areas of the image appear as a pale background color. One solution to that problem is described in US Pat. No. 3.93'7,141.

The solution described in this patent is to reposition the rollers so that the slip nip moves to an ink-free position.

The chrome transfer roller rotates at the same speed as the ink foam roller, and the roller also acts as a fountain pan roller. In this modification, the fountain pan roller is driven by a variable speed motor that controls the feed rate of the dampening solution. Ru.

Therefore, slip nips are formed only where dampening fluid is present. Although this device partially solves the emulsification or ink reversion problem, it requires that the first ink form roller and the transfer roller be frictionally driven, in addition to the need for an oscillating roller. When an elastic roller is used as a fountain pan roller, additional maintenance time is required.

One problem with continuous devices is ghosting. Brate delivery! Various attempts have been made to solve the ghosting problem that occurs in Type 2 devices.

One proposal to solve the ghosting problem is to use a separate dampening foam roller, but in this proposal a vibrating bridge roller is used to connect the dampening foam roller to the first ingiform roller. be done.

The device has been modified in a species 4 manner. One modification was to provide a mechanism to move the vibrating bridge roller so that the warming device could be removed from the inking device during printing operations. Accordingly, the vibrating bridge roller can be moved out of engagement with the dampening foam loaf, reducing ghosting problems.

In summary, the prior art can generally be considered to have the following characteristics.

(i) 'The form roller that supplies the IAL liquid to the plate rotates at substantially the same surface speed as the plate cylinder.

(ii) The feed rate of the dampening fluid is controlled by a separate motor drive 111t which drives at least one of the rollers of the warming device at a slower speed than the plate cylinder.

(iii) Initial metering of the dampening fluid into the thin metering film is done by forming a t1'' amount nip between the two rollers. If the press is wide, the rollers are 9 Must be slanted so that the speed is greater.

Although these prior art devices have gained wide acceptance in the printing industry due to their rapid response times, reduced waste, and the need for fewer skilled operators, various areas remain in need of improvement.

One problem part is that ghosting tends to occur despite conventional attempts to prevent it.

Furthermore, prior art devices tend to have high labor costs, and the slip nip causes emulsification caused by backing of the ink into the dampening solution, which results in blurring. In addition, some prior art devices have been tested by Jii! It is necessary to add alcohol to the L solution.

In the prior art, inking devices (often called delta 5yst-ells) are used to reduce the build-up of foreign particles (referred to as "hickeys") on the lithographic printing plate during printing. ,
)” is also known. This device is described in U.S. Pat. No. 3,467,008. It concerns a conventional device with one set of rollers for dampening and another set of rollers for supplying the dampening fluid.This warming device is not a continuous device, but uses conventional doctor rollers. .

In the device disclosed in U.S. Pat. This first ink form roller is driven at a surface speed lower than the speed of the plate cylinder (!II: vibration 1'-ra).

This creates two slip nips.

The two slip nips include the nip between the first ink form roller and the plate cylinder, and the nip between the first ink form roller and the vibrating roller.

The wiping action occurs at the slip nip adjacent the plate cylinder, and the wiping action removes the hitkey from the plate cylinder. The removed hitskies are carried along the ink path and collected on the lidar roll or in the ink house. This apparatus has been found to substantially increase productivity and improve ink adhesion, particularly in solid areas.

The device described in the '01J patent has limitations.

One is that the construction cost increases to some extent by providing a dual drive groove for the ink form roller. Another limitation is the need for a relatively powerful drive mechanism for the inking roller and the need for a high float mechanism to eliminate unevenness of the floats.

Furthermore, the device described in US Pat. No. 3.46 'i', OO8 has hitherto been used only in conventional inking and warming devices. This Id, ,'6J
This is because it was considered necessary to rotate the L form roller at the same speed as the play 1 cylinder. If the dampening foam roller was not rotated at the same speed as the plate cylinder, there was a risk that the halftone would be blurred or the edges of the solid portion would be blurred.

Another problem arises when using a bridge roller that rotates at the same speed as the dampening foam roller, which causes ink emulsification and ghosting.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a new and improved heating device.

Another object of the invention is to provide a new and improved heating device with improved performance.

Another object of the invention is to provide a new and improved heating device that is inexpensive to manufacture.

Still another object of the present invention is to provide a new and improved continuous lithographic heating device in which ghosts do not substantially occur.

It is an object of this invention to provide a new and improved heating device having an inexpensive drive unit 74.

Yet another object of the present invention is to provide a new and improved heating device that substantially removes foreign particles and (-straddles) ffJ+ simply and rapidly.

Another object of the present invention is to provide a new and improved warming device in which foreign objects and/or hits are removed and ghosting is substantially reduced due to the different surface velocities of the dampening roller and platen link. Our goal is to provide the following.

Yet another object of the invention is to provide a new and improved feed/feeder for a lithographic printing press in which the plate cylinder rotates at different surface speeds to remove foreign particles and/or dust particles! The purpose of the present invention is to provide a J1j device.

Another object of the invention is to provide a new and improved supply system that prevents ink backflow into the dampening fluid! n! 't equipment.

Another object of the invention is to provide a new and improved warming device which has a wiping action to remove foreign particles by incorporating a adding roller having a surface velocity different from that of the plate cylinder.

Another object of this invention is to provide a new and improved method for use in a lithographic printing press to improve print quality by reducing gonut fc.

Another object of the invention is to reduce foreign particles and substantially reduce ghosting/! iii. It is an object of the present invention to provide a new and improved method for use in a continuous contact type lithographic printing press fed with L/liquid.

Another object of the invention is to provide a wiping action for removing foreign particles from the plate cylinder by having a play cylinder and a dampening roller, the plate cylinder and the dampening roller rotating at different surface speeds. The object of the present invention is to provide a new and improved method for use in a continuous contact lithographic printing press.

Still another object of the present invention is to use an ink receiving roller that is in contact with a dampening roller and rotates at the same speed as the dampening roller. Another object of the present invention is to provide an improved heating device.

The objects and advantages of the present invention are set forth in Section 1 below, and will become clear to some extent from the description in Section J1. That is, the objects and advantages are particularly clear in the claims. Appliances, parts, machines listed in the range (14,
Understood and accomplished by equipment, steps, and procedures.

Briefly speaking, the present invention relates to a new and improved feeding device.More specifically, in a preferred embodiment, the present invention relates to a new and improved feeding device. An improvement in the sump of a continuous warming device in which the speed of the dampening roller is different from the speed of the plate cylinder.In a preferred embodiment, the speed of the dampening roller 1d is lower than the speed of the plate cylinder.

Generally speaking, the present invention provides /! un form roller, 1
1 includes a dampening fluid transfer roller and a conventional metering mechanism for adding dampening fluid. The dampening foam roller can be conveniently connected to a drive 47I for a lithographic printing press,
The dampening foam roller rotates at a constant speed that is slower than the speed of the plate cylinder, and a wiping action is created between the foam roller and the plate cylinder that removes foreign material and/or dirt. be able to. An unexpected advantage of the present invention is that ghosting, which is typically a problem with continuous devices, is virtually absent.

'4317W L-form roller rubber may be gear-driven by a float connection with a chrome transfer roller at an intermediate speed between the transfer roller and the plate cylinder.

In another embodiment, the ink fountain roller is lki!
It surface-engages with the L roller and rotates at the same speed as the dampening roller to prevent ink emulsification and ghosting caused by the emulsification.

Example The present invention will be described in detail below based on the drawings.

In FIG. 1(a), U.S. Patent No. 3.46'7,0
As disclosed in the No. 08 specification, means and methods for removing foreign particles from a lithographic printing machine are generally disclosed. Such a device is herein referred to as ``Delta''
It is described as a device.

As shown, a rotating lithographic plate cylinder (two
)It is shown.

The inking device shown in FIG. 1(a) includes an ink form roller (4,), a dampening L form roller (61), a vibrating roller (7), and a supply fgi (10) containing dampening liquid.
) The doctor roller 021 rotates within the pan roller (8) from the position where it engages with the pan roller (8). The ink form roller (4) moves in the same direction as the plate cylinder at the contact position with the plate cylinder, but the surface speed is slower than that of the plate cylinder. The slip nip is the location marked °゛S''. This equipment has been found to substantially remove foreign particles known as ink droplets, and is known as a commercial ink laydown (■). 1 to >ydoX mark).

In that device, the roller (4) is part of the inking device and serves to remove the dirt.

FIG. 1(b) shows various U.S. patents, e.g.
8.03 '7, No. 3,259,062, No. 3,3
43,. 484 and 3.93'i', 141; FIG. Such a temperature supply device includes a plate cylinder circle that engages with the first ink form roller a61, and furthermore, the first ink form roller 061 engages with the chrome pan roller (181), and the chrome pan roller 08
) rotates within the water reservoir (17). A metering roller (20) is provided for metering the dampening liquid. Measuring roller (20)
is driven by the separating drive part and the controller [91, and causes the pan roller 08 to rotate fully while the pan roller (181) is in a locked state with the metering roller (20). In this device, foreign particles (hitkies) can cause printing problems.

Another prior art dampening type mechanism is schematically illustrated in FIG. 1(c).

This device includes a rotating plate cylinder cylinder 2), a first ink form roller C241, and a dampening form roller (
26). Optionally, the first ink form roller (
Between the rollers (24J and c!) and the dampening roller C26).
A bridge roller (321) may be provided which engages with 6).

Panrolla is a dampening liquid reservoir c! 9), and the dampening foam is aligned with the total h10-ra C30) Kff1.

The metering roller is driven by a separate drive motor and controller (not shown).

In FIG. 2, a continuous ink roller feeding type heating device according to a first embodiment of the present invention is schematically shown.

According to the invention, a heating device is provided in which ghosting is substantially eliminated and dust and other foreign objects are removed.

As shown in the embodiment, this heating device has a rotating plate cylinder (3G) that rotates in the direction of 11 and 11.

The rotating plate cylinder (36) engages a first ink form roller (38) which rotates in the opposite direction to the plate cylinder, i.e. in a clockwise direction. In this way, the surfaces of the rotary play 1-cylinder and the first ink form roller move in the same direction at their contact position. The warming device according to the invention has a dampening fluid reservoir (40) in which a chrome pan roller (42) is immersed. The chrome pan roller (42) is in rotational engagement with the elastic metering roller (44). Preferably, the elastic metering roller is covered with rubber. A separate drive motor and controller for the metering roller is provided. A metering roller meters the coating of dampening fluid.

The metering roller (441 Chrome Pan Roller (421K Engagement L), and the Chrome Pan Roller (42) is in contact with the first ink form roller (38).The ink form roller is in contact with the plate cylinder in the opposite direction. and rotates at a slower surface speed than the play 1 cylinder.Due to this speed difference, a wiping action occurs between the plate cylinder (3G) and the first ink foam roller (38j), thereby causing the plate cylinder to Reduces and removes foreign matter called ash that accumulates in the ink area of the printer.

FIG. 3 shows another embodiment of the invention known as a continuous plate feed warming device.

This device is equipped with an ink separation device and a temperature supply device. As shown in the figure, a plate cylinder (46) and an ink form roller (a stick) that rotates in contact with a vibrating roller (5I) are provided.

The dampening liquid supply roller (50) is in contact with the M dampening roller 6,
Furthermore, the dampening roller (52) is in contact with the metering roller 64).

In this embodiment, the dampening fluid supply roller (50) is driven at a lower surface speed than the contact area with the roller (!50+) of the plate cylinder (4ii), thereby reducing foreign particles and allowing their removal. A wiping effect occurs.

This device has the advantage that hitkeys are removed. Furthermore, since one of the rollers in contact with the dampening liquid supply roller (50) is covered only with the dampening liquid, the power required to drive the dampening liquid supply roller (50) may be extremely small. .

FIG. 4 schematically shows another embodiment of the invention. This embodiment of the invention relates to a combination modification of the invention. This embodiment is provided with a plate cylinder system, a dampening form roller (72), and a bridge roller between the first ink form roller and the dampening form roller. A conventional metering roller (76) can also be used to meter the dampening fluid.

A common feature for all embodiments of the invention is that a dampening fluid supply roller supplies dampening fluid to the plate cylinder and rotates at a different surface speed than the plate cylinder (preferably at a slower speed than the play 1 cylinder). It is to be.

In such a device, foreign particles are reduced and ultimately removed, ghosting is substantially reduced, power consumption is lower, and there is less ink backflow into the dampening fluid.

Although the present invention provides means to prevent excessive ink emulsification, such means may cause ghosting in certain situations. Thus, for example, an ink fountain that engages a dampening foam roller and rotates at a slower speed than a plate cylinder will cause ghosting when using a dosing roller. If the ink receiver roller rotates at the same speed as the plate cylinder, excessive ink emulsification will occur.

As shown, the means have a receiver roller which can also act as a bridge roller. The ink receiver is in contact with the rollers i; W and L; 4:
Rotates at the same speed as the L roller.

Although the embodiment of FIGS. 2-4 represents a substantial improvement over prior art examples, excessive ink emulsification and significant ghosting may occur in certain situations. Accordingly, the embodiments of FIGS. 2, 3, and 4 have been modified as shown in FIGS. 5, 6, and 7, respectively.

These modifications of Figures 5, 6, and 7 are the same as those shown in Figures 2, 3, and 4, and include the same descriptions except as noted below. , and the same number is (ticked).

In Fig. 5, the ink receiver is the feeding roller i3! ) is in contact with the dampening roller and rotates by conventional means (not shown) at the same surface speed as the dampening roller. This includes, for example, the dampening roller (38) and the ink receiver roller (39).
The interlocking can be accomplished in any convenient manner well known in the art, such as interlocking.

FIG. 6 shows an embodiment of the invention similar to FIG. 3, in which the ink receptacle is in contact with the dampening roller (49) and the dampening roller (50). The ink receiving roller (49) rotates at the same surface speed as the dampening roller by conventional means (not shown) well known in the art.

FIG. 7 shows a modification of the device shown in FIG.

In this modification, a bridge roller (74) is shown. The changes in this modification example are the dampening roller (6
The bridge roller (7) in contact with the dampening roller (6) rotates at the same speed as the dampening roller. As in the embodiment of FIGS. 5 and 6, such a device avoids excessive ghosting and Emulsification of ink can be prevented.

[Brief explanation of the drawing]

1(a), 1(b), and 1(c) are schematic diagrams showing an example of a conventional heating device, and FIG. 2 is a diagram of a heating device according to an embodiment of the present invention. An overview diagram, FIG. 3 shows another embodiment of the present invention! LV device 1! Figure 4 shows another embodiment of the present invention. 111 is a schematic diagram of the device; FIG. 5 is a schematic diagram of a heating device of another embodiment of the invention similar to FIG. 111 The ink receiver in contact with the sifting roller has a feeding roller. FIG. FIG. 5 is a schematic diagram of another embodiment of the heating device of the present invention similar to FIG. 4; (To the eggplant (4G), (64)...Plate cylinder G8
L G181, (72) --- Ink foam roller +391, (49), (74)... Ink receiver is put roller (IIJ), (70)... Water reservoir (42), (521, ( IJ... Panrolla (44)
, et al.4), (7[j...Measuring roller (50), acupuncture...
...Moisture shift roller l51) ...Vibration roller (741 ...Bridge roller Patent applicant Baldwin Technology Corporation Agent Kenbu Arata (1 other person) No. 6 figure

Claims (1)

[Scope of Claims] (1) A device for moistening a rotary plate cylinder of a lithographic printing press of the type having drive means for rotating the cylinder and other rollers, comprising: (a) dampening liquid supply surface, and (b) 2 above! (C) a measuring means that is in cooperative relationship with the pan roller and measures the thickness of the dampening solution; (c) a first rotating roller for supplying dampening fluid adapted to receive a metered amount of dampening fluid and thereby transferring dampening fluid from said dampening fluid supply reservoir to said first cylinder; a second ink receiver in contact with the first rotating roller; (f) the driving means is adapted to relative rotation between the plate cylinder and the first and second rotating rollers; The first and second rotating rollers and the plate cylinder are rotated at different surface speeds to create a wiping action around the plate cylinder and the first rotating roller to remove foreign particles and reduce ghosting. A device characterized by: (2) The apparatus according to claim 1, wherein the first and second rotating rollers rotate at the same speed. (3) The apparatus according to claim (2), wherein the first and second rotating rollers have a lower surface speed than the plate cylinder. (4) The apparatus according to claim (3), wherein the temperature supply device is an ink roller feeding type. (5) The device according to claim (3), wherein the temperature supply device is of a plate feeding type. (6) The temperature supply device includes an ink roller feed type and a play plate 1.
-Shipping! The device according to claim (3), characterized in that it is a combination type. (71(a) Rotate the plate cylinder, (I))
(C) Place the dampening liquid supply roller in a position to hold it on the surface of the plate cylinder; (J) Apply the measured amount of dampening liquid onto the surface of the i+iJ dampening liquid supply roller. (e) creating a wiping action between the dampening liquid supply roller and the plate cylinder, supplying a measured amount of dampening liquid to the plate cylinder and removing the hit key; 20. The dampening liquid supply roller is rotated in contact with the dampening liquid supply roller to prevent ink emulsification and ghosting. A heating method that removes heat keys and prevents ghosting by supplying a liquid. -) a device for dampening a cylinder comprising: (a) a supply reservoir of dampening fluid; (1)) a pan roller rotating within said dampening fluid reservoir; (C) cooperating with said pan roller; a metering means for metering the thickness of the dampening fluid; (d) contacting said rotary plate cylinder and metering onto the surface /! (e) a first rotary roller for dampening fluid supply, adapted to receive dampening fluid and thereby transfer dampening fluid from the 2W L fluid supply reservoir to the play 1 cylinder; (e) the 11th rotary roller; The second ink receiver in contact with the rotary roller is rotated from (741), and is adapted to the relative rotation between the hand drive means plate cylinder and the first and second rotary rollers,
The first and second rotating rollers and the plate cylinder are rotated at different surface speeds to create a wiping action between the plate cylinder and the first rotating roller to remove foreign particles and reduce ghosting. A heating method comprising: rotating the plate cylinder at a certain surface speed and rotating the first rotating roller at a different surface speed. (9) A device for moving between the plate cylinders in rotation 1 of the lithographic printing machine, having drive means for rotating the rotary plate cylinder and other rollers of the v-plate printing machine, (a) (1)) a pan roller that rotates within the dampening solution supply chamber; (c) a cooperative relationship with the pan roller; 7'!
(d) contacting said rotating plate cylinder and receiving a metered amount of dampening fluid on its surface, thereby causing dampening fluid to flow from said marking fluid supply reservoir into said plate cylinder; I made it to be transferred! I-4: a first rotating roller for supplying ink liquid; (e) a second ink receiving roller that contacts the first rotating roller; The rotating rollers rotate at the same speed,
The driving means is adapted to rotate the plate cylinder and the first and second rotary rollers (1), and rotate the plate cylinder with different surface speeds. using a device that generates a wiping action between the play plate and the first rotating roller to remove foreign particles and reduce ghosting, the first rotating roller and the second rotating roller k n'J
7' A heating method characterized in that the rate cylinder is also rotated at a slow speed.