JPH06255074A - Dampening arrangement of sheet fed press - Google Patents

Abstract

PURPOSE:To enhance printing quality when printed matter reduced in its image line part is printed at a high speed and to prevent the contamination of a water fountain roller with ink. CONSTITUTION:When printed matter having many non-image line parts is printed at a high speed, a water fountain roller 4 is separated from an ink reciprocating roller 3 to be brought into contact with a plate cylinder 1. When printed matter having an image line is printed at a high speed and printed matter is printed at medium and low speeds regardless of the number of image line parts, the water fountain roller 4 is brought into contact with the plate cylinder 1 and an ink reciprocating roller 3 at the same time. When a sheet-fed press is stopped or slowly operated, an ink fountain roller 2 and the water fountain roller 4 are separated from the plate cylinder 1. At this time, the water fountain roller 4 is brought into contact with the ink reciprocating roller 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dampening device provided in a printing unit of a sheet-fed printing press.

[0002]

2. Description of the Related Art A dampening device provided in a printing unit of a conventional sheet-fed printing press will be described with reference to FIG. 6, in which 1 is a plate cylinder, 2 is an inking roller which contacts the plate cylinder 1, and 3 is an inking roller 2.
An ink reciprocating roller that abuts on the plate cylinder, a swimsuit roller 4 that abuts on the plate cylinder 1 and the ink reciprocating roller 3, and a delivery roller 5
6 is a water source roller, 7 is a water boat (water tank), and 8 is a dampening device.

The dampening device 8 comprises a water boat 7, a water source roller 6, a delivery roller 5 and a swimsuit roller 4. The dampening water from the water boat 7 is taken out by the water source roller 6 and delivered to the delivery roller. 5 to the swimsuit roller 4, and further through the swimsuit roller 4 the plate of the plate cylinder 1 and the ink reciprocating roller 3
Supply to. Then, the dampening water supplied to the ink reciprocating roller 3 is supplied to the plate of the plate cylinder 1 together with the ink through the inking roller 3.

[0004]

The dampening device of the conventional sheet-fed printing press shown in FIG. 6 has the following problems. That is, (1) in the case of printing a printed matter having an image area above a certain level at a high speed, and in the case of printing a printed matter at a medium or low speed regardless of the number of the image area, even if the conventional dampening device is used, Good prints can be obtained, but when printing a print with few image areas, that is, a print with many non-image areas at high speed,
Since a considerable amount of dampening water must be supplied to the non-image area of the plate cylinder 1, the dampening water supply amount to the ink reciprocating roller 3 also increases. There is a problem that the increased dampening water mixes with the ink to accelerate the emulsification of the ink, reduce the tack and color of the ink, and deteriorate the print quality. (2) Also, during printing, after the pattern of the plate is transferred from the plate of the plate cylinder 1 to the blanket cylinder, the ink remaining on the image area of the plate of the plate cylinder 1 has a width direction and a circumferential direction of the swimsuit roller 4. Transfers intermittently (the printing area of the plate is generally placed intermittently). Therefore, when the printing is resumed after being stopped or loosened, the swimsuit roller 4 comes into contact with the plate earlier than the inking roller 2 and the ink intermittently transferred to the swimsuit roller 4 has a widthwise direction and a circumferential direction. It is leveled so as to be leveled in the direction, adheres to the non-image area of the plate, and is retransferred to the swimsuit roller 4, so that the swimsuit roller 4 is entirely soiled. There is also a problem that the swimsuit roller 4 is soiled by the ink transferred to the surface of the swimsuit roller 4 during printing.

The present invention is proposed in view of the above problems, and an object of the present invention is to improve print quality when a printed matter having a small image area is printed at high speed. Another object of the present invention is to provide a dampening device for a sheet-fed printing press that can prevent the swimsuit roller from being soiled with ink.

[0006]

In order to achieve the above object, the dampening apparatus of the sheet-fed printing press of the present invention simultaneously applies the swimsuit roller to the plate cylinder and the position of the plate cylinder and the ink reciprocating roller. A switching device for switching to the contact position is provided.
Further, the dampening device of the sheet-fed printing press according to the present invention includes a switching device for separating the swimsuit roller from the plate cylinder and abutting the ink reciprocating roller when the plate cylinder and the inking roller are separated.

[0007]

The dampening device of the sheet-fed printing press according to the present invention is configured as described above, and is used for high-speed printing of a printed matter having a small number of image areas, that is, a printed matter having many non-image areas. When the dampening water is required), the swimsuit roller is separated from the ink reciprocating roller and brought into contact with the plate cylinder, so that the mixture of the dampening water and the ink at the ink reciprocating roller and the emulsification of the ink are prevented. Printing quality is improved. Further, when printing a printed matter having a certain amount of image areas at a high speed, or when printing a printed matter at a medium or low speed regardless of the number of image areas, the swimsuit roller is brought into contact with the plate cylinder and the ink reciprocating roller at the same time. Therefore, dampening water is appropriately supplied directly to the non-image area of the plate of the plate cylinder by the swimsuit roller to prevent the ink from adhering, and the ink containing the appropriate amount of dampening water is mixed in the image area of the plate of the plate cylinder. Provided, print quality is again improved.

Further, the dampening device of the sheet-fed printing press of the present invention is constructed as described above, and since the inking roller and the swimsuit roller are separated from the plate cylinder when the sheet-fed printing press is stopped or loosened, Ink remaining on the image area of the plate cylinder does not transfer to the swimsuit roller. Further, at this time, since the swimsuit roller is brought into contact with the ink reciprocating roller, the ink that is piled on the surface of the swimsuit roller is removed, and the swimsuit roller is not stained with the ink.

[0009]

【Example】

(First Embodiment) Next, a dampening device of a sheet-fed printing press according to the present invention will be described with reference to a first embodiment shown in FIGS. 1 and 2. In FIG. Ink reciprocating roller in which roller 3 is in contact with inking roller 2 is a swimsuit roller in which 4 is in contact with plate cylinder 1 and ink reciprocating roller 3, 5 is a delivery roller, 6 is a water source roller, and 7 is a water tank (water tank). Is.

3a and 3a are both shaft end portions of the ink reciprocating roller 3, C is a shaft center passing through the center of the ink reciprocating roller 3 including both shaft end portions 3a and 3a, 10 and 10 are frames, and 9 are the same. Bushings fixed to the frame 10 support both shaft ends 3a of the ink reciprocating roller 3 by the bushes 9 so as to be rotatable and axially movable. 11 is a switching device, and 12 and 12 are both shaft end portions 3 of the ink reciprocating roller 3.
a is an eccentric bush fitted to 3a, E is the center of each eccentric bush 12, 12a is an arm of each eccentric bush 12,
3 and 13 are bearings that rotatably support the eccentric bushes 12, 14 is an air cylinder, and 14a is the same air cylinder 1.
In the piston rod No. 4, the tip end of the piston rod 14a is pivotally supported on the arm 12a of the eccentric bush 12. Reference numeral 15 is a stopper for regulating the upper limit position Q of the arm 12a of the eccentric bush 12, 15a is a position adjusting screw provided on the stopper 15, and 16 is an arm 12 of the eccentric bush 12.
The switching device 11 is constituted by the respective portions 12 to 16 and a stopper 16a for regulating the lower limit position R of a, and an adjustment groove 16a provided in the stopper 16. e is the amount of eccentricity between the center E of the eccentric bush 12 and the axis C of the ink reciprocating roller 3.

Next, the operation of the dampening device of the sheet-fed printing press shown in FIGS. 1 and 2 will be described in detail. (1) First, the operation of the dampening device in the case of printing a printed matter with few image areas, that is, a printed matter with many non-image areas at high speed will be described. When the piston rod 14a of the air cylinder 14 is operated in the extending direction and the arm 12a of the eccentric bush 12 is rotated downward, the ink reciprocates on an arc centered on the center E of the eccentric bush 12 and having a radius of the eccentricity e. When the center C of the roller 3 moves upward and the arm 12a of the eccentric bush 12 moves to the lower limit position R, the ink reciprocating roller 3 and the swimsuit roller 4 separate, and only the swimsuit roller 4 is a known swimsuit roller 4 not shown. It contacts the plate cylinder 1 at the attachment position of the attachment / detachment device. (2) Next, the operation of the dampening device will be described in the case of printing a printed matter having an image area above a certain level at a high speed, and in the case of printing a printed matter at a medium to low speed regardless of the number of the image area. When the piston rod 14a of the air cylinder 14 is actuated in the contracting direction and the arm 12a of the eccentric bush 12 is rotated upward, the arm 12a of the eccentric bush 12 moves to the upper limit position Q, contrary to the above, and the ink reciprocates. Laura 3 and swimsuit Laura 4
And the ink reciprocating roller 3 and the swimsuit roller 4 simultaneously contact the plate cylinder 1 at the attachment position of the attachment / detachment device.

The stopper 15 has a position adjusting screw 1
5a is provided, the stopper 16 is provided with an adjusting groove 16a, and the ink reciprocating roller 3 (the outer diameter of the ink reciprocating roller 3 is reused after being ground several times). The upper limit position Q and the lower limit position R can be set by rotating the eccentric bush 12 based on the position P where the reciprocating roller 3 and the swimsuit roller 4 kiss-touch.

(Second Embodiment) Next, a dampening apparatus of a sheet-fed printing press according to the present invention will be described with reference to a second embodiment shown in FIGS. 3 to 5, where 1 is a plate cylinder and 2 is a plate cylinder 1. Inking roller that touches,
3 is an ink reciprocating roller which abuts the inking roller 2, 4
Is a swimsuit roller that contacts the plate cylinder 1 and the ink reciprocating roller 3, 5 is a delivery roller, 6 is a water source roller, and 7 is a water tank (water tank).

3a and 3a are both shaft end portions of the ink reciprocating roller 3, C is an axial center passing through the center of the ink reciprocating roller 3 including both shaft end portions 3a and 3a, 10 and 10 are a frame, and 9 is the same. Bushings fixed to the frame 10 support both shaft ends 3a of the ink reciprocating roller 3 by the bushes 9 so as to be rotatable and axially movable. 11 is a switching device, and 12 and 12 are both shaft end portions 3 of the ink reciprocating roller 3.
a is an eccentric bush fitted to 3a, E is the center of each eccentric bush 12, 12a is an arm of each eccentric bush 12,
3 and 13 are bearings that rotatably support the eccentric bushes 12, 14 is an air cylinder, and 14a is the same air cylinder 1.
In the piston rod No. 4, the tip end of the piston rod 14a is pivotally supported on the arm 12a of the eccentric bush 12. Reference numeral 15 is a stopper for regulating the upper limit position Q of the arm 12a of the eccentric bush 12, 15a is a position adjusting screw provided on the stopper 15, and 16 is an arm 12 of the eccentric bush 12.
The switching device 11 is constituted by the respective portions 12 to 16 and a stopper 16a for regulating the lower limit position R of a, and an adjustment groove 16a provided in the stopper 16. e is the amount of eccentricity between the center E of the eccentric bush 12 and the axis C of the ink reciprocating roller 3.

FIG. 5 shows the three-position selector switch 21 and the three-position selector switch 21.
The control device for the air cylinder 14 has a 4-port 2-position switching solenoid valve 22 that is switched by a position switching switch 21. Next, the operation of the dampening device of the sheet-fed printing press shown in FIGS. 3 to 5 will be described. The piston rod 14a of the air cylinder 14 is operated in the extending direction to move the eccentric bush 1
When the arm 12a of No. 2 is rotated downward, the center C of the ink reciprocating roller 3 moves upward on an arc centered on the center E of the eccentric bush 12 and having the radius of the eccentricity e, and the arm 12a of the eccentric bush 12 is moved. Is moved to the lower limit position R, the ink reciprocating roller 3 and the swimsuit roller 4 separate from each other, and the swimsuit roller 4
Only the known swimsuit roller 4 comes into contact with the plate cylinder 1 at the attached position of the attachment / detachment device.

Further, the piston rod 1 of the air cylinder 14
4a is operated in the contracting direction to move the arm 12 of the eccentric bush 12.
When a is rotated upward, contrary to the above, the eccentric bush 1
The arm 12a of No. 2 moves to the upper limit position Q, the ink reciprocating roller 3 and the swimsuit roller 4 contact each other, and the ink reciprocating roller 3
The swimsuit roller 4 and the swimsuit roller 4 simultaneously come into contact with the plate cylinder 1 at the attachment position of the attachment / detachment device.

The operation of the control system of the air cylinder 14 is as follows. The 3-position selector switch 21 is "ON or ON", "AUTO or AUTO", "OFF or OFF".
It is possible to switch to three positions. When the same 3-position selector switch 21 is turned off, the 4-port 2-position selector solenoid valve 22
Causes the air cylinder 14 to move in the extension direction, and when the 3-position changeover switch 21 is turned on, the 4-port 2-position changeover solenoid valve 22 causes the air cylinder 14 to move in the contraction direction so that the ink reciprocating roller 3 causes the swimsuit roller 4 to move. Away from
Contact them.

Also, the three-position selector switch 21 is set to AUTO.
When the sheet-fed printing press is stopped or loosened, when the inking roller 2 and the swimsuit roller 4 are separated from the plate cylinder 1, the 4-port 2-position switching solenoid valve 22 is activated by the cylinder removal signal obtained at this time. The ink reciprocating roller 3 is automatically switched to the ON state, and the ink reciprocating roller 3 is brought into contact with the swimsuit roller 4 in the detached position of the detachment device (the detached position separated from the plate cylinder 1).

As described above, in this embodiment, when the sheet-fed printing press is stopped or loosened, the inking roller 2 and the swimsuit roller 4 are used.
Is separated from the plate cylinder 1 to eliminate the transfer of the ink remaining on the image area of the plate cylinder 1 to the swimsuit roller 4. Further, the swimsuit roller 4 is brought into contact with the ink reciprocating roller 3 to remove the ink piling on the surface of the swimsuit roller 4 to eliminate stains.
The transfer of the ink to the ink reciprocating roller 3 is caused by the swimsuit roller 4 of the ink that is piling on the surface of the swimsuit roller 4.
This occurs because the adhesive force to the ink is weaker than the adhesive force of the ink of the ink reciprocating roller 3.

Since the inking roller 2 is separated from the plate cylinder 1 during printing, the operator operates the switch 21 while seeing the ink piling state on the surface of the swimsuit roller 4.
The swimsuit roller 4 is brought into contact with the ink reciprocating roller 3 to remove the ink piling on the surface of the swimsuit roller 4.
While the swimsuit roller 4 is constantly in contact with the plate cylinder 1 and the ink reciprocating roller 3 during printing, stains on the swimsuit roller 4 can be prevented. When the printing is performed, the ink is emulsified by the dampening water and the printing quality is deteriorated. Therefore, there are many cases where the swimsuit roller 4 is brought into contact with only the plate cylinder 1 for printing.

[0021]

The dampening device of the sheet-fed printing press of the present invention is constructed as described above, and the printed matter having a small image area, that is,
When printing printed matter with many non-image areas at high speed (when a considerable amount of dampening water is required), the swimsuit roller is separated from the ink reciprocating roller and abuts against the plate cylinder. It is possible to prevent the mixing of fountain solution and ink and the emulsification of ink in the printing, and to improve the printing quality. Further, when printing a printed matter having a certain amount of image areas at a high speed, or when printing a printed matter at a medium or low speed regardless of the number of image areas, the swimsuit roller is brought into contact with the plate cylinder and the ink reciprocating roller at the same time. Therefore, dampening water can be directly supplied to the non-image area of the plate of the plate cylinder by the swimsuit roller, and ink adhesion can be prevented.
It is possible to supply an ink in which an appropriate amount of dampening water is mixed to the image area of the plate of the plate cylinder, and in this case also, printing quality can be improved.

Further, the dampening device of the sheet-fed printing press according to the present invention is constructed as described above, and since the inking roller and the swimsuit roller are separated from the plate cylinder when the sheet-fed printing machine is stopped or loosened, It is possible to eliminate the transfer of ink remaining on the image area of the plate cylinder to the swimsuit roller. Further, at this time, since the swimsuit roller is brought into contact with the ink reciprocating roller, the ink that is piled on the surface of the swimsuit roller can be removed and the swimsuit roller is not stained with the ink.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a dampening device for a sheet-fed printing press according to the present invention.

FIG. 2 is a front view of the dampening device.

FIG. 3 is a side view showing a second embodiment of the dampening device.

FIG. 4 is a front view of the dampening device.

FIG. 5 is a system diagram showing a control device of an air cylinder of the dampening device.

FIG. 6 is a side view showing a dampening device provided in a printing unit of a conventional sheet-fed printing press.

[Explanation of symbols]

 1 plate cylinder 2 inking roller 3 ink reciprocating roller 4 swimwear roller 5 delivery roller 6 water source roller 7 water boat (water tank) 11 switching device

Claims (2)

[Claims] 1. A dampening device for a sheet-fed printing press, comprising a switching device for switching a swimsuit roller between a position in which it contacts the plate cylinder and a position in which it contacts the plate cylinder and the ink reciprocating roller simultaneously. 2. A wet type of a sheet-fed printing press, comprising a switching device for separating the swimsuit roller from the plate cylinder and contacting the ink reciprocating roller when the plate cylinder and the inking roller are separated. Equipment.