JP2913304B2 - Lithographic printing press lithographic dampening equipment - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a dampening device for use in a lithographic printing press, and in particular, a novel automatic adjusting dampening device for directly sending a dampening solution to a plate cylinder of a lithographic printing press. About.

[Background of the Invention]

The use of dampening equipment is well known in the lithographic industry. The main purpose of the dampening device is to apply evenly and evenly distributed amounts of dampening liquid to the plate cylinders of the lithographic printing press in order to ensure high quality images. If too much dampening fluid is applied to the plate cylinder, the ink will be diluted or emulsified or diluted and emulsified, and the image will have a dirty or blurred appearance. If too little dampening fluid is applied, the ink will migrate to the non-printing areas and will damage the image. That is, it is necessary to provide a dampening device for applying a uniform coating of the dampening solution to the plate cylinder at a desired ratio.

One method of applying a dampening solution to a lithographic plate is Dahlgre
This is described in U.S. Pat. No. 3,168,037 to n). Dahlgren's device uses a water pan with a rubber-coated adjustment roller. The chrome-plated transfer roller is arranged parallel to the adjusting roller and shares a tangent with the adjusting roller. The applicator roller is positioned parallel to the transfer roller and shares a tangent with the transfer roller so that a thin coating of dampening fluid ultimately transfers from the water pan to the applicator roller. A separate ink train delivers the ink to the wetting roller. This dampening roller delivers both ink and dampening fluid to the plate cylinder. In Dahlgren's device, the volume of dampening fluid delivered by the device is controlled by varying the pressure between the adjusting roller and the transfer roller and between the transfer roller and the applicator roller. Independent drive means are provided for rotating the transfer roller and the applicator roller at different speeds so as to cause slippage therebetween. This sliding further regulates the volume of dampening solution delivered by the device to the lithographic printing press.

A second method of applying a dampening solution to a plate cylinder of a lithographic printing press is disclosed in U.S. Pat. No. 4,45,459 to Loudon.
It is described in the specification of 5,983. According to Roudong, a dampening roller and an adjusting roller are used. Each roller is positioned in a parallel relationship with each other such that the rollers contact each other along a tangent. A nip is formed just above the two rollers. The dampening fluid reservoir is held in a nip so that a coating of the dampening fluid can be passed between the rollers. This liquid film is directed to the plate cylinder along the wetting roller. Loudon's method also uses a device to return excess dampening fluid to the reservoir.

Loudon and Dahlgren describe a device called a "continuous dampening device". Another type of dampening device, which is considered "discontinuous," generally uses an ink transfer roller to direct the dampening fluid across the width of the plate cylinder. Continuous dampeners are considered superior to discontinuous dampers because they can deliver a continuous, relatively thin coating of dampening fluid to the plate cylinder.

[Summary of the Invention] The dampening device of the present invention includes a pan roller, a transfer roller, and a damp roller mounted in a frame. The transfer roller is rotatably mounted on a suspension support member that is pivotally mounted on the frame about the axis of the pan roller. The suspension support member is pivotable between a first position in which the transfer roller shares a tangent with the padding roller and a second position in which the transfer roller is spaced from the padding roller. The pan roller is partially disposed within the water pan or fountain solution reservoir such that the pan roller is in contact with the dampening liquid. Each roller in the present dampening device is made of rubber and is driven to rotate at the surface speed of the plate cylinder. The volume of the dampening solution delivered by the present dampening device can be controlled by manually adjusting the pressure between the transfer roller and the receiving roller using the adjusting means. The rollers of the dampening device all hold both ink and dampening fluid during normal use. Also, a vibrating roller is provided so that a uniform coating of ink and water is conveyed to the wet roller.

According to the dampening device of the present invention, by providing the two-position eccentric cam mechanism, the transfer roller is moved from the rotational contact of the dampening roller so that the lithographic printing press is ready for the next printing operation. The detachment can be easily, quickly and reliably performed.

In order to prepare for the next printing operation, it is necessary to rotate the plate cylinder in the reverse direction, and by lifting the transfer roller from contact with the wet roller,
The plate cylinder can be rotated in the opposite direction without rubbing contact between the transfer roller and the wetting roller. This is because the gears that drive the receiving roller and the watering roller remain engaged with each other during this time.

Also, preparation for the next printing operation can be completed without transferring dampening liquid from the receiving roller and the transfer roller onto the dampening roller.

〔Example〕

Referring to the drawings, an embodiment of the present invention is shown in FIG. 1 showing an automatic adjusting dampening apparatus 10 for use in a lithographic printing press. The dampening device 10 includes a frame member 12 to which a receiving roller 14 and a watering roller 16 are rotatably mounted. The receiving roller 14 and the wetting roller 16 are
Are arranged in parallel with each other.

The pan roller 14 is preferably made of a relatively hard rubber material. It has been found to be good to have a pan roller with a smooth, hard surface that is ink-receptive. Especially 90 to 10
It has been found that a rubber roller having a durometer hardness of 0 provides optimum characteristics. However, it is clear that the pan roller 14 can be made of any material having the above-mentioned properties.

The wetting roller 16 is also preferably made of a rubber material.
However, the best dampening properties are that the wetting roller 16 is 30 to 35
It has been found that it is obtained when the gyrometer has a hardness of. It is desirable to avoid the use of softer rubbers as heretofore shown because of their tendency to absorb and swell the dampening fluid. However, it should also be apparent that the wetting roller 16 can be constructed from any material having the desired materials described above.

The water pan or fountain reservoir 18 is mounted to the frame member 12 by screwing so that the rollers 14 are partially disposed within the water pan 18. The water tray 18 is a water tray on the frame member 12.
It can be mounted by screwing through holes 20 arranged at each end of 18. The dampening solution is supplied into the water receiving tray 18 by the liquid supply hose 22.
To be sent through. The hose 22 communicates the dampening solution in the water pan 18 through a hole 24 in the bottom of the water pan 18. The opposite end 26 of the hose 22 is connected to a dampening reservoir having any conventional construction. In another preferred embodiment, the fountain solution level in the water pan 18 is maintained by use of a fountain solution reservoir mounted in the water pan 18 so that the liquid level in the water pan 18 drops below a predetermined level. At this time, air enters the reservoir, and the dampening solution is sent out from the reservoir into the water receiving tray 18. Any other means can be used to maintain the level of dampening fluid in the water pan 18 without departing from the scope of the present invention.

A suspension support member 28 is pivotably mounted on the frame member 12 about a longitudinal axis 30 of the receiving roller 14. Second
As is apparent from the drawing, a slot 32 is formed in the suspension support member 28. The transfer roller 34 is rotatably and slidably mounted in the slot 32. Transfer roller 34
Are arranged in parallel relation to the receiving roller 14 and the watering roller 16.

The transfer roller 34 is preferably made of a rubber material having a medium hardness. It has been found that optimal dampening properties are obtained with a 40 to 50 durometer hardness. Further, transfer roller 34 may have a substantially non-porous glassy finish. Such a finish can be obtained, for example, by applying a urethane epoxy resin to a rubber roller. Obviously, the transfer roller 34 can be composed of any or each material having the desired properties.

The suspension support member 28 is connected to the first position shown in FIG.
It can be pivoted to and from a second position shown in broken lines in the figure. In the first position, the suspension support member 28 is arranged such that the transfer roller 34 contacts the damp roller 16 along a tangent line. Due to the parallel orientation of the transfer roller 34 and the wetting roller 16, these rollers contact each other over their respective widths. In the first position, the transfer roller 34 contacts the receiving roller 14 along a tangent line. Transfer roller 34 and pan roller
14 are in parallel with each other and thus contact each other over their respective widths.

A nip 36 is formed at a contact line between the receiving roller 14 and the transfer roller 34. In operation, the pan roller 14 directs the dampening fluid film upwardly from the water pan 18 to the nip 36. The nip 36 produces an adjustment effect and the transfer roller 34
Produces a thin, uniform coating of the dampening solution. The thickness of the dampening solution film transferred from the receiving roller 14 to the transfer roller 34 can be controlled by adjusting the pressure applied to the receiving roller 14 by the transfer roller 34. This adjustment is made by selectively positioning the transfer rollers 34 along the slots 32. In the preferred embodiment, a screw means 38 is disposed on each suspension support member 28.
In this embodiment, the screw means 38 urges the transfer roller 34 along the slot 32 by a screw action in a direction to approach or move away from the receiving roller 14, so that the transfer roller 34 has a smaller or more volume from the receiving roller 14 to the transfer roller 34. Can carry the dampening fluid.

In another preferred embodiment, the screw means 38 comprises a sprocket and mating rails. In this embodiment, the screw means 38 is selectively positioned and retained by the use of sprockets and mating rails. In this embodiment, the screw means 38
Is preferred because it does not become loose during use. Obviously, any means can be used to selectively position transfer roller 34 along slot 32 without departing from the scope of the present invention.

It has been found that optimum adjustment can be made when the receiving roller 14 is positioned at a different height from the transfer roller 34.
In particular, it is preferable that the angle between the rotation axes of the transfer roller 34 and the receiving roller 14 be 8 ° to 38 °. That is, it is desirable that the frame member 12 and the suspension support member 28 be configured so that the receiving roller 14 and the transfer roller 34 are within this range.

The slot 32 is inclined with respect to the horizontal. In the preferred embodiment, the angle of inclination 42 is 30 degrees. The transfer roller 34 is provided with these rollers relative to the wetting roller 16.
They are arranged so as to remain in contact with each other irrespective of the movement of the transfer rollers 34 along 32. Water roller
Due to the contact between the transfer roller 16 and the transfer roller 34, the dampening solution is transferred to the dampening roller 16.

The vibration roller 44 is rotatably mounted between the frame members 12. The vibrating roller 44 is disposed in parallel with the receiving roller 14, the watering roller 16, and the transfer roller 34. The vibration roller 44 is preferably made of relatively hard rubber. The vibrating roller 44 can be selectively positioned in a first vertical groove 46 or a second vertical groove 48 formed in each frame member 12. When the vibration roller 44 is disposed in the first vertical groove 46, the vibration roller 44
Contacts the wetting roller 16 along the tangent line. When the vibrating roller 44 is selectively disposed in the second vertical groove 48, the roller 44 contacts the transfer roller 34 along a tangent line. The purpose of the vibrating roller 44 is to ensure that the ink and dampening fluid coatings on the dampening roller 16 and transfer roller 34 are of uniform thickness and composition.

In a second preferred embodiment, two frames
The vibrating rollers 44 are arranged. One vibrating roller is located in a first vertical groove 46 and another is located in a second vertical groove 48. This example has been found to be particularly useful when used in high volume ink presses.

The suspension support member 28 pivots between first and second positions by using a two-position eccentric cam mechanism 50. With the rotation of the suspension support member 28, the transfer roller 34 is separated from the watering roller 16. In this second position, the dampening device of the present invention is substantially separated from the lithographic cylinder when the dampening fluid is not carried from the transfer roller 34 to the dampening roller 16. As described above, the hanging support member 28 is a frame member.
At 12 is mounted so as to pivot about a pan roller 14. That is, even if the suspension support member 28 rotates from the first position to the second position, the transfer roller 34
Obviously, they will still be in contact.

The dampening device 10 can be mounted on a lithographic printing press 52 such that the dampening roller 16 contacts the plate cylinder 54 along a tangent line. In operation, the ink is sent to the plate cylinder 53 by the ink train. The dampening solution is directed by the dampening device 10 from the water pan 18 to the plate cylinder 54 as described above. At the same time, the ink is conveyed from the plate cylinder 54 to the watering roller 16, the transfer roller 34, and the receiving roller 14. That is, each roller of the dampening device 10 carries both ink and dampening liquid during operation. When a larger amount of ink is carried to the plate cylinder 54, the amount of ink on the watering roller 16, the transfer roller 34 and the receiving roller 14 increases accordingly. Saucer roller
As the amount of ink at 14 increases, a greater volume of dampening fluid is forced through the nip 36 and ultimately to the wetting roller 16 and plate cylinder 54. This property of the dampening device 10
This means that only a slight adjustment of the screw means 38 is required during operation.

The plate cylinder gear 56 (FIG. 4) is mounted on the plate cylinder 54. Further, a watering roller gear 58 and a receiving roller gear 62 are attached to the watering roller 16 and the receiving roller 14, respectively. The wet roller gear 58 is configured to engage with the plate cylinder gear 56 so as to cooperate therewith, and drives the wet roller 16 at the surface speed of the plate cylinder 54. The wetting roller gear 58 also meshes with a play gear 60, which also meshes with a saucer roller gear 62, to drive the saucer roller 34 at the surface speed of the plate cylinder 54. . The transfer roller 34 is driven by friction at the surface speed of the plate cylinder 54 by the receiving roller 14. It is clear that the plate cylinder 54 and the transfer roller 34 rotate in the same direction, and the watering roller 16 and the pan roller 14 rotate in the opposite direction. Obviously, many variations of the gear train may be used without departing from the scope of the invention, as long as all rollers are driven at the surface speed of the plate cylinder.

As the rotation speed of the plate cylinder 54 increases,
At the same time, the volume of dampening fluid delivered by the dampening device 10 increases. Due to this feature, as the amount of ink in the plate cylinder 54 increases, a larger amount of dampening solution can be sent to the present apparatus as well as the dampening apparatus 10 can be made substantially automatically adjustable as described above. it can. In this case, for normal use, the pressure between the receiving roller 14 and the transfer roller 34 need only be slightly changed.

The dampening device 10 may be pivotally mounted on the lithographic printing press to allow the dampening roller 16 to be spaced from the plate cylinder 54 for cleaning or pre-humidification. The lithographic printing press 52 is equipped with a lever 64 and the dampening device 10 is mounted on a plate cylinder.
It is designed to lift from the state of contact with 54.

Although the present invention has been described in detail with reference to the embodiments, it goes without saying that the present invention can be variously modified without departing from the spirit thereof.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the dampening apparatus of the present invention, and FIG. 2 is an enlarged perspective view of a suspension support member of the dampening apparatus of FIG.
FIG. 3 is a perspective view showing the relative orientation of each roller of the dampening device of FIG. 1, and FIG. 4 is a perspective view of a gear train of the dampening device of FIG. 10 ... Dampening device, 12 ... Frame, 14 ... Sink roller,
16: Watering roller, 18: Water tray, 28: Hanging support member, 34: Transfer roller, 38: Adjusting means (screw means), 52: Lithographic printing press, 54: Plate cylinder, 56 , 58,
60,62 ... Gears.

Continuation of the front page (56) References JP-A-60-250992 (JP, A) JP-A-61-10492 (JP, A) JP-A-62-25046 (JP, A) JP-A-62-167631 (JP, A) , U) Japanese Utility Model Showa 61-125429 (JP, U) Japanese Utility Model Showa 61-31765 (JP, U) Japanese Patent Publication No. 47-27444 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB Name) B41F 7/24-7/40

Claims (13)

(57) [Claims] 1. A frame, a water pan, a pan roller arranged to be in contact with the dampening liquid in the water pan and rotatably mounted on the frame, and a transfer contacting the pan roller along a tangent line. A roller, a watering roller positioned so as to be in contact with the lithographic plate of the lithographic printing press along a tangent line and rotatably mounted on the frame, An attached suspension support member, wherein the transfer roller is rotatably and slidably mounted in the slot, is pivotable between a first position and a second position, and is the first position. In the transfer roller, the transfer roller contacts the wetting roller along a tangent line, and the transfer roller contacts the receiving roller along a tangent line, and the transfer roller causes friction. A suspension support member, wherein the transfer roller is spaced from the drip roller in the second position, the suspension support member being mounted on the suspension support member, the pan roller, and the transfer roller An adjusting means for adjusting the pressure between the lithographic printing press and a driving means for driving the pan roller and the dipping roller at the surface speed of the lithographic printing press. . 2. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 1, wherein said receiving tray roller, said transfer roller and said dipping roller are made of rubber. 3. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 2, wherein said pan 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 said dipping roller has a durometer hardness of 30 to 35. 5. The dampening device for dampening a lithographic plate of a lithographic printing press according to claim 2, wherein said transfer roller has a durometer hardness of 40 to 50. 6. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 1, wherein said hanging support member pivots about said rotation axis of said pan roller with respect to said frame. 7. A lithographic printing press wherein said suspension support member pivots between said first and second positions by selectively positioning said second position eccentric cam means mounted on said lithographic printing press. Item 7. A dampening device for moistening a lithographic plate of the lithographic printing press according to Item 6. 8. An adjusting means for adjusting a pressure between the receiving roller and the transfer roller, the adjusting means being attached to the suspension support member and allowing the transfer roller to be positioned along the suspension support member by screws. 2. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 1, comprising a pair of screw means. 9. A dampening device for dampening a lithographic plate of a lithographic printing press according to claim 8, wherein said transfer roller can be selectively positioned along said slot formed in said hanging support member. 10. A lithographic printing plate according to claim 1, wherein said driving means for driving said receiving roller and said wetting roller comprises a plurality of intermeshing gears driven by rotation of a plate cylinder of said lithographic printing press. A dampening device that dampens the lithographic printing plate. 11. A dampening apparatus for dampening a lithographic plate of a lithographic printing press according to claim 1, wherein a vibrating roller is rotatably mounted on said frame so as to contact along a tangent line of said wetting roller. 12. The vibration roller is selectively positioned at the first position or the second position, and the vibration roller contacts the wet roller at the first position along a tangent line. 12. The dampening device for dampening a lithographic plate of a lithographic printing press according to claim 11, wherein the lithographic printing plate contacts the transfer roller at the second position. 13. A lithographic printing press according to claim 11, wherein a second vibration roller is rotatably mounted on said frame, said second vibration roller being in contact with said transfer roller along a tangent line. Wet dampening device.