JP2586972B2 - Dampening water equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dampening device for an offset printing press.

[0002]

2. Description of the Related Art A fountain solution in the prior art is described in, for example, Handbook of Printing Engineering (1st edition, 2nd edition, July 20, 1983)
As shown on pages 694 to 695 of the printing press and Gihodo Shuppan Co., Ltd.
First edition on April 15, 987, published by Tokyo Machinery Works, Ltd.), pages 36-38.

[0003] In these dampening devices, two examples will be described. As shown in Figs. 3 and 4, a fountain roller 51, a transfer roller 52, and a dampening roller 53 are sequentially provided. Is brought into contact with the inking unit by contacting the ink reciprocating roller 56 of the inking unit (see FIG. 2) or in a state independent from the inking unit (see FIG. 3).

[0004] Then, the fountain roller 51 guides the dampening solution in the fountain 54 on its peripheral surface, and is transferred to the transfer roller 52.

[0005] The dipping roller 53 is a plate cylinder 55 through a printing plate.
, Or driven by the plate cylinder 55 via the printing plate and driven by the ink reciprocating roller 56, and rotated at substantially the same peripheral speed as the peripheral speed of the plate mounted and rotated on the plate cylinder 55, Upon contact with the peripheral surface of the transfer roller 52, the damper is received on the peripheral surface and supplied to the plate surface.

[0006]

The fountain solution devices according to the prior art as described above have the following problems. In the dampening device where the dampening roller is linked to the inking unit, in addition to the dampening water entering the inking unit from the printing plate surface via the inking roller during printing operation, Also, fountain solution is constantly mixed, and the emulsification of the ink on the peripheral surface of each roller of the inking device proceeds more than necessary. As a result, quality deterioration such as a decrease in density may occur on the printed surface. In order to prevent such a problem from occurring, extremely delicate adjustment of the dampening solution supply amount was required.

In a dampening device provided separately and independently from the inking device, useless dampening water does not directly enter the inking device from the dampening device, but the dampening roller is used during printing operation. Since the ink is constantly rotated while being in contact with the plate surface, the ink is transferred from the plate surface in a state corresponding to the image distribution on the plate surface.

[0008] When the image is evenly distributed on the printing plate surface, the ink is uniformly transferred to the peripheral surface of the wetting roller, so that the affinity of the peripheral surface of the wetting roller to the dampening solution is substantially uniform. In general, this is rare.
Since the image portions are arranged at a specific pitch in the printing plate for character printing, the ink is transferred at the pitch of the image portions to the peripheral surface of the wetting roller, and goes around the peripheral surface of the water roller. Be a streak. For this reason, the affinity of the surrounding surface of the wetting roller for dampening water differs between the part where the ink has transferred and the part where the material of the surrounding surface of the wetting roller is exposed, and the surrounding surface of the wetting roller The distribution of fountain solution transferred to the surface is uneven.

As a result, the dampening solution cannot be supplied uniformly to the printing plate surface, and quality deterioration such as stains and density unevenness on the printing surface may occur. In order to prevent such a problem from occurring, the printing operation must be interrupted to clean the peripheral surface of the watering roller.

The present invention does not require delicate adjustment of the dampening solution supply amount, and also does not require cleaning of the peripheral surface of the wetting roller which interrupts the printing operation, so that the printing plate surface can be evenly distributed. It is an object of the present invention to provide a dampening water device capable of supplying dampening water to a state.

[0011]

A fountain roller according to the present invention comprises a fountain roller provided so as to rotate without being displaced in the axial direction in a state in which a part of the peripheral surface is immersed in fountain solution. The transfer roller is provided so as to rotate without being displaced in the axial direction on the downstream side of the fountain roller, and the transfer roller whose peripheral surface is in contact with the peripheral surface of the fountain roller is not displaced in the axial direction on the downstream side of the transfer roller. A wet roller and a lipophilic peripheral surface are provided so as to rotate and are in contact with the peripheral surface of the transfer roller and the plate surface mounted on the peripheral surface of the plate cylinder. rotatably provided in contact with, it is reciprocated in the axial direction, dampening roller the peripheral surface of its lipophilicity
The ink is transferred from the circumference of the
Comprises a row of rollers made up of a rider roller that is a so that pushed open the ink of the peripheral surface of both rollers at the contact portion with the provided separately from the inking unit.

In the preferred roller arrangement of the above-mentioned roller row, the position where the peripheral surface of the rider roller contacts the peripheral surface of the padding roller is located upstream of the position where the peripheral surface of the padding roller contacts the plate surface in the rotational direction. Side, and on the downstream side in the rotational direction from the position in contact with the peripheral surface of the transfer roller.

[0013]

In the dampening device of the present invention, for example, when the fountain roller rotates, the dampening solution adheres to the peripheral surface of the fountain roller and is led out, and the peripheral surfaces of the fountain rollers contacting each other on the downstream side. Is transferred to the peripheral surface of the transfer roller.

The fountain solution transferred to the peripheral surface of the transfer roller is transferred to the peripheral surface of the wetting roller that contacts the peripheral surface of the transfer roller on the downstream side by the rotation of the transfer roller. The dampening solution transferred to the peripheral surface of the dampening roller is transferred to the plate surface by rotating the dampening roller. Further, the ink is transferred from the image portion of the printing plate surface to the peripheral surface of the watering roller which rotates in contact with the printing plate surface.

The rider roller rotates in contact with the wetting roller while reciprocating in the axial direction, and ink is transferred to the lipophilic peripheral surface from the circumferential surface of the wetting roller while the rider roller is rotated. By the reciprocating motion in the axial direction, the ink on the peripheral surfaces of both the rollers is pushed and spread at the contact portion between the rider roller and the wetting roller.

[0016] By the action of the rider roller, the entire contact area between the watering roller and the peripheral surface of the rider roller is covered with the ink. The peripheral surface of the dampening roller covered with ink has a substantially uniform affinity for dampening water, and the dampening water is transferred from the transfer roller peripheral surface to the peripheral surface of the dampener in a substantially uniform distribution state. You.

The dampening solution transferred to the peripheral surface of the dampening roller in a substantially uniform distribution state is transferred to the plate surface as described above, and covers the non-image area of the plate surface. In the transfer of the dampening solution from the circumferential surface of the dampening roller to the printing plate surface, the dampening solution on the circumferential surface of the dampening roller is moved by the reciprocating motion of the rider roller in the axial direction. Dispersed and mixed into the surface ink.

When the rider roller is in the preferred roller arrangement state, the dampening solution transferred from the peripheral surface of the transfer roller to the peripheral surface of the wetting roller is first dispersed and mixed in the ink as described above. The ink is separated from the ink by the contact pressure between the peripheral surface of the dampening roller and the plate surface, and is transferred to the plate surface to cover the non-image area of the plate surface.

The dampening water remaining on the peripheral surface of the dampening roller is
The rotation of the wetting roller reaches the point of contact between the peripheral surface of the transfer roller and the surface of the wetting roller, is combined with the dampening solution provided by the peripheral surface of the transfer roller, and is leveled by the transfer roller and the wetting roller. The excess is taken up on the peripheral surface of the transfer roller.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two examples of a dampening device according to an embodiment of the present invention will be described with reference to FIGS. The dampening device 10 is provided separately and independently of the inking device 20, and includes a roller row including a fountain roller 11, a transfer roller 12, a wet roller 13 and a rider roller 14.

The fountain roller 11 is provided so as to be rotatably driven at a relatively low peripheral speed in a state where a part of the peripheral surface is immersed in the fountain solution stored in the fountain 15 which can store the fountain solution. Have been.

The transfer roller 12 provided on the downstream side of the fountain roller 11 has its peripheral surface in contact with the peripheral surface of the fountain roller 11,
It is designed to be driven to rotate at the same peripheral speed as that of the eleventh peripheral speed or at a slightly different peripheral speed.

A watering roller 13 rotatably provided downstream of the transfer roller 12 has its peripheral surface mounted on the peripheral surface of the transfer roller 12 and the peripheral surface of the plate cylinder 16 which rotates at a relatively high peripheral speed. Contacting the printing plate surface,
It is designed to rotate at substantially the same speed as the printing plate surface by entrainment.

Further, the rider roller 14 having a lipophilic peripheral surface is rotatably provided with the peripheral surface in contact with the peripheral surface of the watering roller 13 and is substantially rotatable with the watering roller 13 by rotating. It is rotated at the same peripheral speed, and is reciprocally driven in the axial direction by an appropriate well-known means (not shown).

In a preferred roller arrangement, the position where the peripheral surface of the rider roller 14 contacts the peripheral surface of the padding roller 13 is located upstream of the position where the peripheral surface of the padding roller 13 contacts the plate surface in the rotational direction. Further, it is on the downstream side in the rotation direction from the position where it contacts the peripheral surface of the transfer roller 12.

The operation of the dampening device 10 will be described. When the fountain roller 11 is driven to rotate, the water stored in the fountain 15
Is transferred to the peripheral surface of the transfer roller 12 from the peripheral surface of the fountain roller 11 that is in contact with the downstream side. Transfer roller
The drive rotation peripheral speed of 12 is appropriately set in consideration of the amount of dampening water transferred from the peripheral surface of the fountain roller 11 to the peripheral surface of the transfer roller 12.

The dampening solution transferred to the peripheral surface of the transfer roller 12 is transferred to the peripheral surface of the wetting roller 13 that contacts the peripheral surface of the transfer roller 12 on the downstream side by the rotation of the transfer roller 12. Water roller
13 rotates with the rotation of the printing plate surface, the rotation peripheral speed of the water setting roller 13 is faster than the rotation peripheral speed of the transfer roller 12, and the dampening water on the peripheral surface of the transfer roller 12 is The roller 13 is transferred so as to meet the peripheral speed difference between the two rollers on the peripheral surface of the roller 13, that is, while being stretched on the peripheral surface of the wetting roller 13.

The dampening solution transferred to the peripheral surface of the damper roller 13 is transferred to the plate surface by the rotation of the damper roller 13. In addition, a wetting roller 13 that rotates in contact with the plate surface
Is transferred from the image portion of the printing plate surface to the peripheral surface of the printing plate.

The rider roller 14 reciprocates in the axial direction and rotates with the rotation of the watering roller 13, and ink is transferred to the lipophilic peripheral surface from the peripheral surface of the watering roller 13. By the reciprocating motion of the rider roller 14 in the axial direction, the ink on the peripheral surfaces of the rider roller 14 and the wetting roller 13 is spread at the contact portion between the roller and the watering roller 13.

By the action of the rider roller 14,
The entire area where the water roller 13 and the rider roller 14 come into contact with each other is covered with the ink. The surrounding surface of the dampening roller 13 covered with the ink has a substantially uniform affinity for the dampening solution, and the dampening solution is substantially evenly distributed from the peripheral surface of the transfer roller 12 to the surrounding surface of the dampening roller 13. Is transferred by

The dampening solution transferred to the peripheral surface of the dampening roller 13 in a substantially uniform distribution state is transferred to the plate surface as described above, and covers the non-image area of the plate surface. This watering roller
In the transfer of dampening solution from the peripheral surface of the plate 13 to the plate surface, the rider roller 13
Is dispersed and mixed into the ink on the peripheral surface of the wetting roller 13 and the ink on the peripheral surface of the rider roller 14.

When the rider roller 14 is in the above-described preferred roller arrangement state, the transfer roller 12
The fountain solution transferred from the peripheral surface to the peripheral surface of the dampening roller 13 is first dispersed and mixed into the ink as described above, and then the ink and the ink are contacted by the contact pressure between the peripheral surface of the dampening roller 13 and the plate surface. It is separated and transferred to the plate surface to cover the non-image area of the plate surface.

The dampening water remaining on the circumferential surface of the wetting roller 13 reaches the contact position between the circumferential surface of the transfer roller 12 and the circumferential surface of the wetting roller 13 by the rotation of the wetting roller 13, Transfer roller combined with dampening solution brought by the surrounding surface
The excess amount is equalized by the peripheral speed difference between the water roller 12 and the watering roller 13, and the excess is taken up by the peripheral surface of the transfer roller 12.

On the other hand, when the rider roller 14 is not in the preferable roller arrangement state, the dampening solution transferred from the peripheral surface of the transfer roller 12 to the peripheral surface of the watering roller 13 is first transferred to the plate surface. In addition to covering the non-image area of the printing plate surface, the dampening water remaining on the peripheral surface of the wetting roller 13 causes the peripheral surface of the rider roller 14 and the peripheral surface of the The ink reaches the contact position and is dispersed and mixed into the ink as described above. The wetting roller 13 subsequently rotates, and the peripheral surface of the state in which the dampening water is dispersed and mixed in the ink comes into contact with the peripheral surface of the transfer roller 12, and the peripheral surface of the transfer roller 12 wets the peripheral surface. Water is transferred and added.

Accordingly, when the rider roller 14 is not in the preferred roller arrangement state, the rider roller
The dampening water on the peripheral surface of the wetting roller 13 is slightly larger than when the roller 14 is in the preferred roller arrangement state.

[0036]

According to the dampening water device of the present invention, the dampening water can be evenly applied to the printing plate surface without delicate adjustment of the dampening water amount and without cleaning the peripheral surface of the dampening roller which causes interruption of printing operation. Water supply is possible and the ink of the inking unit is not excessively emulsified.

As a result, excessive emulsification of the ink by the dampening solution that occurs as the printing operation proceeds and deterioration of the printing quality due to uneven supply of the dampening solution to the printing plate surface are prevented. Further, the present invention is effective in eliminating the need for skill in work and saving labor, and contributes to improving the operation efficiency of a printing machine. In addition, each roller row has a single fountain roller,
A fountain that consists of only four types of rollers, transfer roller, watering roller, and rider roller. The contact area of the outer peripheral surface, which is a place for excess or excess water, remains at three places. Since the contact portion of the roller remains at one place, the supply of water from the water pool is suppressed, the inaccuracy of the supplied water amount is eliminated, and the accuracy of water amount adjustment can be improved. In addition, since only the rider roller in the roller row is reciprocally driven in the axial direction, the driving energy is reduced, the operating cost is reduced, and the mechanical load is reduced and the mechanism is simplified. As a result, it is possible to save space, reduce the occurrence of defects, facilitate maintenance and management, and reduce manufacturing costs. In addition, the peripheral surface of the rider roller is located on the upstream side in the rotational direction from the position of contact with the printing plate surface on the peripheral surface of the watering roller, and downstream of the rotational direction from the position in contact with the peripheral surface of the transfer roller. , The proper amount of dampening water is transferred from the peripheral surface of the transfer roller to the peripheral surface of the water setting roller in an appropriate amount in a substantially uniform distribution state.

[Brief description of the drawings]

FIG. 1 is a configuration perspective view of a dampening water device according to an embodiment of the present invention.

FIG. 2 is a configuration perspective view of a different type dampening solution device in the embodiment of the present invention.

FIG. 3 is a configuration perspective view of a dampening solution device according to a conventional technique.

FIG. 4 is a perspective view showing the configuration of another type of dampening solution device in the related art.

[Explanation of symbols]

 10 Fountain device 11 Fountain roller 12 Transfer roller 13 Watering roller 14 Rider roller 15 Fountain 16 Plate cylinder 20 Ink unit

Claims (2)

(57) [Claims] 1. A fountain roller provided so as to rotate without displacing in the axial direction in a state in which a part of the peripheral surface is immersed in the dampening solution, and does not displace in the axial direction downstream of the fountain roller. A transfer roller whose peripheral surface is in contact with the peripheral surface of the fountain roller is provided so as to rotate without being displaced in the axial direction on the downstream side of the transfer roller, and the peripheral surface of the transfer roller is provided. A wet roller and a lipophilic circumferential surface in contact with the peripheral surface and the printing plate surface mounted on the peripheral surface of the plate cylinder are rotatably provided in contact with the peripheral surface of the wet roller, and reciprocate in the axial direction. Driven by water on its lipophilic surface
The ink is transferred from the circumference of the application roller and
The ink on the peripheral surface of both rollers
It comprises a row of rollers made up of the the spreading rider roller that is a so that, dampening water apparatus provided separately from the inking unit. 2. In the roller row, the position where the peripheral surface of the rider roller contacts the peripheral surface of the padding roller is located on the upstream side in the rotation direction from the position where the peripheral surface of the padding roller contacts the plate surface, and the transfer is performed. The dampening water device according to claim 1, wherein the dampening water device is located downstream of the position in contact with the peripheral surface of the roller in the rotation direction.