JPH01286856A - Dampening device for plate of lithographic printer - Google Patents

Abstract

PURPOSE: To regulate a volume of dampening fluid by rotating a transfer roller at a position at an interval between a position common with a water form roller and a contact line, rotatably driving respective rollers at a surface speed of a plate cylinder, and regulating a pressure between the transfer roller and a dampening fluid pan roller. CONSTITUTION: At a first position, a transfer roller 34 is brought into contact with a water form roller 16 along a contact line, and also brought into contact with a dampening fluid pan roller 14 along the contact line. The roller 34 is selectively positioned along a groove hole 32, and a thickness of a film of the dampening fluid to be transferred from the roller 14 to the roller 34 is controlled by regulating a pressure applied to the roller 14 by the roller 34. A hoisting support member 28 is rotated to a second position by using a two-position eccentric cam mechanism 50, and the roller 34 is isolated at an interval from the roller 16. A water form roller gear is engaged cooperatively with a pan roller gear via an idle gear to drive the roller 34 and the roller 16 at a surface speed of a plate cylinder 54.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dampening device used in a lithographic printing press, particularly a novel automatically adjusting dampening device that directly delivers dampening liquid to the plate cylinder of a lithographic printing press. Regarding.

[Background of the invention]

The use of dampening devices is well known in the lithographic printing industry.

The main purpose of the dampening device is to apply a uniformly distributed amount of dampening to the plate cylinder of the lithographic printing press to ensure that high quality images are obtained. If too much dampening fluid is applied to the plate cylinder, the ink will become emulsified or diluted and emulsified, resulting in smeared or blurred lines.

If too little dampening fluid is applied, ink will transfer to non-print areas and spoil the image. That is, it is necessary to bias the dampening device to apply a coating such as a dampening solution to the metal plate cylinder at a desired ratio.

One method of applying a dampening solution to a lithographic plate is by Dahlgren.
ren) U.S. Patent No. 3.168,
It is described in the specification of No. 037. Dahlgren's device consists of a water tray placed on a rubber covered vertical roller. A chrome-plated transfer roller is arranged parallel to and shares a tangent with the adjustment roller. The applicator roller is placed parallel to the transfer roller and shares full contact with the transfer roller.
This allows a thin rupture of the dampening solution to eventually transfer from the water pan to the applicator roller. A separate ink train delivers ink to the rollers.

The rollers deliver both ink and dampening fluid to the plate cylinder. In Dahlgren's device, by varying the pressure 2 between the regulating roller and the transfer roller and between the transfer roller and the applicator roller, the volume of dampening fluid delivered by the device 'k; filJ #
do. Independent drive means are gold-plated to rotate the transfer roller and applicator roller at different speeds to create a slip between them. This slippage further adjusts the volume of dampening fluid delivered by this device to the lithographic printing press.

A second method of applying dampening fluid to the plate cylinder of a lithographic printing press is to
No. 4,455,983 to London K.

According to Luton, dampening swimsuits use all rollers and adjustment rollers. The rollers are positioned in parallel relationship with each other such that the rollers are in tangential contact with each other. 2
A nip is formed just above the rollers. The dampening fluid reservoir is held in place so that the dampening fluid can be passed between the rollers. This liquid is filled with swimsuits and is sent along the rollers in a cylinder. Luton's method also uses a device to return excess dampening solution to the reservoir.

Luton and Dahlgren (2003) describe a device called a ``continuous dampening device.'' Another type of dampening device, which is considered to be ``continuous,'' generally uses an ink transfer roller to press the plate cylinder. Directing the dampening fluid across the width.Continuous dampening systems are considered superior to discontinuous dampening systems because they are capable of delivering a continuous, relatively thin coat of dampening fluid to the plate cylinder.

[Summary of the invention]

In the dampening device of the present invention, the tray roller, the transfer roller, and the swimsuit are provided with a lathered tray roller in the frame.

The transfer roller has a saucer roller on the frame.
It is rotatably attached to a suspension support member that is pivotably attached to the rotation 9 of one peg. The suspension support member has a first position where the transfer roller shares a tangential line with the swimsuit roller, and a second position where the transfer roller is spaced apart from the swimsuit roller.
It is possible to rotate between the positions of The saucer roller is
A portion of the tray roller is disposed within the water supply tray so as to be in contact with the dampening liquid. Each roller in the dampening device is made of rubber and is driven to rotate at the surface speed of the plate cylinder. The volume of dampening fluid delivered by the present dampening device can be controlled by manual adjustment using all pressure adjustment means between the transfer roller and the pan roller.

The dampening device rollers hold both ink and dampening fluid during normal use in the pan. The vibrating rollers also work together so that an even, homogeneous coating of ink and water is carried by the swimsuit.

〔Example〕

Embodiments will be described with reference to the drawings. FIG. 1 shows a #J adjustment dampening device 10 according to the present invention used in a lithographic printing machine.
(I-shown. The dampening device 10 is completely equipped with a frame member 12 to which a saucer roller 14 and a swimsuit roller 16 are rotatably attached.
6 are disposed on the frame member 12 in parallel relation to each other.

The saucer roller 14 is made of a relatively hard rubber material.
) is better. It has been found that it is better to have the entire groove of the saucer roller with a smooth ink-receptive reverse surface. In particular, it has been found that optimum properties can be obtained by using a co-9mm roller with a durometer hardness of 90 to 100. However, it is clear that the pan roller 14 may be constructed from any material having the characteristics described above.

The swimsuit preferably has rollers 16 also constructed from a rubber material. However, it has been found that optimum dampening properties are obtained when the swimsuit has a roller 1G of 30 to 35 sol. The use of softer combs, as previously shown, is desirably avoided due to their tendency to absorb all the dampening solution and wet the rlJ3. However, it is also clear that the swimsuit rollers 16 may be constructed of any material having the desired materials described above.

The water pan 18 is screwed onto the frame part 12 so that the roller 14 is partially disposed within the water pan 18.
I can see it. The water pan 18 can be attached to the frame member 12 by screwing through holes 20 located at each end of the water pan 18. The dampening liquid is supplied through the liquid supply hose 2 in the water tray 18.
The money will be sent after two payments have been made. The hose 22 communicates with the dampening fluid in the water pan 18 at a hole 24'id in the bottom of the water pan 18. The opposite end 26 of the hose 22 is connected to a dampening fluid reservoir of any conventional construction. In another preferred embodiment, the level of dampening fluid in the water pan 18 is maintained through the use of a dampening fluid reservoir mounted within the water pan 18 such that the level of dampening fluid in the water pan 18 is reduced below a predetermined level. When this occurs, air enters the reservoir and the dampening solution is discharged from the entire reservoir into the water tray 18. Any other means may be used to maintain the level of dampening fluid in the water pan 18 without departing from the scope of the present invention.

The frame member 12 includes a longitudinal axis 30 of the saucer row 214.
A suspension support member 28 is pivotally mounted around the suspension support member 28. As is clear from FIG. 2, the support member 28 is fully formed with slots 32. Transfer roller 34 is rotatably and slidably mounted within slot 32. The transfer roller 34 is arranged in a parallel relation to the tray roller 14 and the swimsuit roller 16.

Transfer roller 34 is preferably constructed from a medium hard ZAM material. It has been found that a 40 to 50 kg bag size provides optimum dampening properties. Further, transfer roller 34 preferably has a substantially non-porous glass-like finish 2. Such a finish may be obtained, for example, by applying a urethane epoxy resin to the rubber roller. It will be appreciated that transfer roller 34 may be constructed from any material or materials having the desired properties.

The suspension support member 28 is placed between the first position and the second position shown in FIG.
It can be pivoted to and from a second position, shown in phantom in the figure. In its first position, the suspension support member 28 is positioned such that the transfer roller 34 contacts the roller 16 tangentially. Due to the mutually parallel orientation of the rollers 1G, the transfer rollers 34 and the suit are in contact with each other over the length of each roller.

At the position of the writer 1, the transfer roller 34 contacts the saucer roller 14:''C; along the concubine gland. Further, since the transfer roller 34 and the tray roller 14 are in a parallel relationship with each other, they are in contact with each other over 1 wA of each.

A nip 36 is formed at the line of contact between the pan roller 14 and the transfer roller 34. During operation, saucer roller 1
4 directs a film of dampening solution upwardly from the water pan 18 into the nip 36. The nip 36 has a conditioning effect that creates a thin-like coating of dampening fluid on the transfer roller 34. The thickness of the antinode of the dampening solution transferred from the saucer roller 14 to the transfer roller 34 can be controlled by adjusting the pressure applied to the saucer roller 14 by the transfer roller 34. This adjustment is performed along the groove hole 32 and the transfer roller 34? This is done by selective positioning. In the preferred embodiment, each suspension support member 28 has a threaded means 38t", 1iiZ. In this embodiment, the threaded means 38 includes a transfer roller 34t and a slot 32.
The dampening solution can be threadedly biased toward or away from the pan roller 14 along the lateral axis to convey less or more dampening liquid from the pan row 214 to the transfer roller 34.

In another preferred embodiment, screw means 38 includes a sprocket and a mating rail. In this embodiment, screw means 38 is selectively positioned and retained through the use of sprockets and mating rails. This embodiment is preferred as the screw means 38 will not become loose during use. It will be appreciated that any means may be used to selectively position transfer roller 34 along slot 32 without departing from the pivot of the present invention.

It has been found that optimum adjustment can be made when the saucer roller 14 is positioned at a different height from the transfer roller 34. In particular, it is preferable that the angle between the rotational axes of the transfer roller 34 and the tray roller 14 be 8° to 68°. That is, it is desirable that the frame member 12 and the joint support member 28 be configured so that the tray roller 14 and the transfer roller 34 are within this range.

The slot 32 is inclined with respect to the horizontal. In the preferred implementation, this tilt angle is 42 and 30'.

The transfer roller 34 has a swimsuit with respect to the roller 16,
Transfer roller 3 where these rollers follow the groove 32
4 are arranged so that they remain in contact with each other regardless of movement. Due to the contact between the swimsuit roller 16 and the transfer roller 34, the dampening liquid is transferred to the swimsuit roller 1G.

The vibrating roller 44 is rotatably fitted between each frame member 12. The transfer roller 44 is arranged at a t4θ angle parallel to the saucer roller 14, the swimsuit roller 16, and the transfer roller 34. The vibrating roller 44 is preferably made of relatively hard rubber. The vibrating roller 44 can be selectively positioned within a first vertical groove 46 or a second vertical groove 48 formed in each frame member 12. When the hyperactive roller 44 is disposed within the first vertical groove 46, the lifting roller 44 is placed in the swimsuit roller 16.
Stay tangential to and touch. Further, when the vibrating roller 44 is selectively disposed within the second vertical groove 48, the row 24
4 comes into contact with the transfer roller 34 along the length of the transfer roller 34. The purpose of vibrating roller 44 is to ensure that the ink and dampening fluid coatings on roller 16 and transfer roller 34 are uniform in thickness and composition.

In a second preferred embodiment, two
One vibrating roller is disposed in a first vertical groove 46 and the other vibrating roller is disposed in a second vertical groove 48. This embodiment has been found to be particularly useful when used in high volume ink all printing presses.

Sling support member 28 is rotated between first and second positions by using a two-position eccentric cam mechanism 50. As the suspension support member 28 rotates, the transfer roller 34 separates the swimsuit from the roller 1G. In this second position, the dampening device of the invention
When the swimsuit is not being conveyed to the rollers 16, it is substantially separated from the lithographic cylinder. As described above, the suspension support member 28
is mounted to frame member 12 for pivoting about a saucer roller 14. That is, it is clear that even if the suspension support member 28 is rotated from its first position to its second position, the transfer roller 34 remains in close contact with the tray roller 14.

The dampening device 10 can be attached to the lithographic printing press 32, and the swimsuit can be attached so that the roller 1G contacts the plate cylinder 54 along the contact line. In operation, ink is delivered to the plate cylinder 54 by an ink train.

The dampening liquid is supplied to the water tray 1 by the dampening device 10 as described above.
8 to the plate cylinder 54. At the same time, the ink is conveyed from the plate cylinder 54 to the swimsuit roller 16, transfer roller 34, and tray roller 14. That is, each roller of the dampening device 10 carries both ink and dampening liquid during operation.

- When the swimsuit is conveyed to the ink plate cylinder 54 with a large amount of ink, the amount of ink on the roller 16, transfer roller 34 and saucer roller 14 increases accordingly.

When the amount of ink on the saucer roller 14 increases, a larger volume of dampening fluid is forcefully sent through the two tubes and the swimsuit is conveyed to the roller 16 and the plate cylinder 54 in a RH manner. This characteristic of the dampening device 10 means that only slight adjustments of the screw means 38 are required during operation.

A plate cylinder gear 56 (FIG. 4) is attached to the plate cylinder 54. Furthermore, the swimsuit is the row 216 and the saucer roller 14.
The swimsuit has a roller gear 58 and a saucer roller gear 6, respectively.
2. Fully installed. The suit is configured such that the roller gear 58 cooperatively meshes with the plate cylinder gear 56 such that the suit drives the roller 16 at the surface speed of the plate cylinder 54. The swimsuit roller gear 58 also works and meshes with the idle gear 30V, and the idle gear 30 also works as the saucer roller gear 6.
2'/C mesh together so that the tray roller 34 is driven at the surface speed of the cylinder 54. The transfer roller 34 is moved by the tray roller 14 through friction at the surface speed of the plate cylinder 54. It is clear that the plate cylinder 54 and the transfer roller 34i rotate in the same direction, but the swimsuit row 21G and the saucer roller 14 rotate in the opposite direction. It is also clear that as long as all the rollers are driven at the surface speed of the plate cylinder '7', many variations of the side of the pile train may be used without departing from the scope of the invention. .

As the transfer speed of the plate cylinder 54 increases, the tray roller 1
4 increases at the same time, so that the volume of dampening liquid delivered by the dampening device 10 increases. This feature allows the device to feed a larger amount of dampening t'a-as the amount of ink in the plate cylinder 54 increases, and also makes the dampening device 10 substantially self-adjustable as described above. I can do this. In this case, in normal use, only a slight change in the pressure between the tray roller 14 and the transfer roller 34 is required.

The dampening device 10 is preferably pivotally mounted on the lithographic printing press so that the swimsuit can be moved out of the plate cylinder 54 a distance + m from the plate cylinder 54 for cleaning or pre-moistening purposes. The lithographic printing machine 32 has 64 levers installed and a dampening device 10.
Although the present invention has been described in detail with respect to its embodiments, the present invention still remains without departing from its spirit. Of course it can be done.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the dampening device of the present invention, and FIG. 2 is an enlarged perspective view of the hanging support portion O of the dampening device of FIG. 6 is a perspective view of the dampening device shown in FIG. 1 showing the relative orientation of each roller, and FIG. 4 is a perspective view of the gear train of the dampening device shown in FIG. 1. 10...Moisturizer, 12...Frame, 14...
- Receiver roller, 16... Swimsuit roller, 18... Water receiver, 28... Hanging support member, 34... Transfer roller, 38... Adjustment means (screw means), 32...
Lithographic printing machine, 54...plate cylinder, 56.58,30
．． 62...Gear. FIG. 1 Procedural amendment (bin)

Claims (1)

[Claims] 1. A frame, a dampening liquid reservoir, a saucer roller disposed so as to be in contact with the dampening fluid in the dampening solution reservoir and rotatably attached to the frame; a transfer roller that contacts along a tangential line; a dampening roller that is rotatably attached to the frame and that is positioned so as to contact the planar plate of the lithographic printing machine along a tangential line; and pivotably mounted between a first position and a second position, wherein in the first position the transfer roller is in tangential contact with the wet roller; a suspension support member tangentially contacting the tray roller and being frictionally driven by the tray roller, and in the second position, the transfer roller is spaced apart from the wetting roller; an adjusting means attached to the suspension support member for adjusting the pressure between the saucer roller and the transfer roller; a driving means for driving the saucer roller and the water forming roller at the surface speed of the planographic plate of the lithographic printing machine; A dampening device for dampening the lithographic plate of a lithographic printing press, comprising: 2. A dampening device for dampening a lithographic plate of a lithographic printing machine according to claim 1, wherein the saucer roller, transfer roller and dampening roller are made of rubber. 3. A dampening device for dampening a planographic plate of a lithographic printing press according to claim 2, wherein the saucer roller has a durometer hardness of 90 to 100. 4. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 2, wherein the dampening roller has a durometer hardness of 30 to 35. 5. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 2, wherein the transfer roller has a durometer hardness of 40 to 50. 6. A dampening device for dampening a lithographic printing press plate according to claim 5, wherein the transfer roller has a glassy non-porous finish. 7. A dampening device for dampening a lithographic plate of a lithographic printing machine according to claim 6, wherein a urethane epoxy resin is used as the glass-like porous finish. 8. A dampening device for dampening a lithographic printing press plate according to claim 1, wherein the suspension support member pivots relative to the frame about the axis of rotation of the pan roller. 9. A lithographic printing machine according to claim 8, wherein the suspension support member is pivotable between first and second positions by selectively positioning eccentric cam means mounted on the lithographic printing machine. dampening device. 10. Adjusting means for adjusting the pressure between the saucer roller and the transfer roller by a pair of screw means attached to the suspension support member and capable of positioning the transfer roller along the suspension support member with a screw. A dampening device for dampening a lithographic plate of a lithographic printing machine according to claim 1. 11. A dampening device for dampening a lithographic printing press plate according to claim 10, wherein a slot is formed in the suspension support member so that the transfer roller can be selectively positioned along the slot. 12. A moisturizer for moistening a lithographic plate of a lithographic printing machine according to claim 1, wherein the driving means for driving the saucer roller and the dampening roller is constituted by a plurality of mutually meshing gears driven by rotation of a plate cylinder of the lithographic printing machine. device. 13. A dampening device for dampening a planographic plate of a lithographic printing machine according to claim 1, wherein the vibrating roller is rotatably mounted on the frame and is in contact with the dampening roller along a tangential line. 14. selectively positioning a vibrating roller in a first position or a second position, the vibrating roller tangentially contacting the swim roller in the first position but contacting the transfer roller in the second position; 14. A dampening device for dampening a planographic plate of a lithographic printing press according to claim 13, wherein the dampening device is adapted to be in contact with the plate. 15. A dampening device for dampening a planographic plate of a lithographic printing press according to claim 13, wherein a second vibrating roller is rotatably mounted on the frame, and the second vibrating roller contacts the transfer roller along a tangential line. 16. a frame, a dampening fluid reservoir, an elastomeric saucer roller rotatably mounted to the frame and arranged to be in contact with the dampening fluid in the dampening fluid reservoir, and mounted parallel to the saucer roller; an elastomeric transfer roller tangentially contacting the pan roller; and an elastomeric transfer roller rotatably mounted on the frame parallel to the pan roller and parallel to the plate of the lithographic printing machine; an elastomeric wet roller positioned in tangential contact; and an elastomeric dip roller pivotally mounted to the frame and pivotable between a first position and a second position, the transfer roller being rotatable. and in the first position, the transfer roller contacts the wet roller tangentially, and the transfer roller contacts the tray roller tangentially and is driven by the tray roller through friction,
and a suspension support member in which the transfer roller is spaced apart from the wet roller in the second position; and an adjusting means attached to the suspension support member for adjusting the pressure between the saucer roller and the transfer roller. . A dampening device for dampening a planographic plate of a lithographic printing press, comprising: drive means for driving the saucer roller and the dampening roller at a surface speed of the planographic plate of the lithographic printing press. 17. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 16, wherein the saucer roller has a durometer hardness of 90 to 100. 18. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 16, wherein the transfer roller has a durometer hardness of 40 to 50. 19. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 16, wherein the dampening roller has a durometer hardness of 30 to 35. 20. A dampening device for dampening a lithographic printing press plate according to claim 16, wherein the transfer roller has a gaseous, non-porous finish. 21. The lithographic printing press according to claim 16, wherein an elastomeric vibrating roller is rotatably mounted on the frame, and the vibrating roller is arranged parallel to a water-forming roller and in contact with the water-forming roller along a tangential line. Moistening device. 22. A dampening device for dampening a lithographic printing press plate according to claim 21, wherein the vibrating roller can be selectively positioned at the first position or the second position of the frame. 23. A dampening device for dampening a planographic plate of a lithographic printing press according to claim 21, wherein a second vibrating roller is rotatably mounted on the frame, and the second vibrating roller contacts the dampening roller along a tangential line. 24. a frame; an elastomeric saucer roller rotatably attached to the frame; and an elastomeric saucer roller rotatably attached to the frame, parallel to the saucer roller and in contact with the saucer roller along a tangential line, the saucer roller causing friction. an elastomeric transfer roller that is driven by an elastomeric transfer roller; an elastomeric water applicator roller that is attached to the frame so that the transfer roller is arranged in parallel and in contact with the transfer roller along a tangential line; and a drive means driven at the surface speed of the printing plate of the printing press. 25. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 24, wherein the tray roller has a durometer hardness of 90 to 100. 26. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 24, wherein the transfer roller has a durometer hardness of 40 to 50. 27. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 24, wherein the dampening roller has a durometer hardness of 30 to 35. 28. A dampening device for dampening a lithographic printing press plate according to claim 24, wherein the transfer roller has a glassy non-porous finish. 29. The lithographic printing machine lithographic plate according to claim 24, wherein an elastomeric vibrating roller is rotatably mounted on the frame, and the vibrating roller is arranged parallel to and tangentially in contact with the dampening roller. Moistening device. 30. A dampening device for dampening a lithographic printing press plate according to claim 29, wherein the vibrating roller is selectively positionable in the first position and the second position of the frame. 31. A dampening device for dampening a planographic plate of a lithographic printing machine according to claim 29, wherein a second vibrating roller is rotatably mounted on the frame, and the second vibrating roller is in contact with the dampening roller along a tangent line. 32. A dampening device for dampening a planographic plate of a lithographic printing press according to claim 24, wherein the dampening device main body is provided with an adjusting means for adjusting the pressure between the saucer roller and the transfer roller.