JP2002036507A - Printing machine ink removal method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A simple means of changing the attachment / detachment timing of a roller or the like without using a rider roller or the like,
Provided is a highly versatile ink removing method for a printing press capable of removing ink with high precision from a damp roller or the like. SOLUTION: There is provided an ink removing step in which an ink forming roller 5 and a water forming roller 2 are attached to the plate cylinder 1 and the water forming roller 2 is detached from the transfer roller 4 of the water supply device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing ink from an offset rotary printing press or the like.

[0002]

2. Description of the Related Art In a lithographic printing press such as an offset rotary printing press, an image is formed on the surface of a plate mounted on a plate cylinder by ink and water supplied by an ink device and a water supply device (fountain device), respectively. Is formed, and this image is transferred to paper directly or via a blanket cylinder, and printing is performed.

In general, the above-mentioned inking device transfers ink accumulated in an ink fountain to an ink fountain roller, an ink retrieving roller, an ink dispensing roller, an ink oscillating roller, and an ink applying roller to supply ink to the plate surface. It has become.

[0004] On the other hand, the water supply device includes a watercraft in which water is stored, a water source roller which is immersed in the water in the watercraft and rotates, and a watering roller which rotates with the peripheral surface brought into contact with the plate surface. And a transfer roller (a metering roller) which is located between the water supply roller and the watering roller and whose peripheral surface is in contact with the two rollers, wherein the water pulled up by the water supply roller is transferred by the transfer roller. , And is continuously transferred to a wet roller and supplied to the plate surface.

[0005]

By the way, in the lithographic printing press described above, as printing progresses, a phenomenon occurs in which the ink emulsified by the supply of water from the water supply device gets caught in the wetting roller. If this phenomenon progresses, the supply of water from the water supply device will not be carried out smoothly, and printing stains will occur. Therefore, it is necessary to remove ink from the watering roller at a predetermined time.

Japanese Patent Application Laid-Open No. Hei 7-171943 discloses a configuration in which a rider roller bridges a wet roller and an ink roller. Even with this configuration, it is possible to prevent the ink from being entangled in the watering roller by keeping the water film thickness of the watering roller constant, but it is widely applied to lithographic printing presses by further increasing the roller arrangement in a narrow installation space. And there is a problem that it lacks versatility.

SUMMARY OF THE INVENTION An object of the present invention is to provide a general-purpose method capable of removing ink from a watering roller or the like with high accuracy by using simple means of changing the timing of attaching or detaching a roller or the like without using a rider roller or the like. It is an object of the present invention to provide a method for removing ink from a printing press having high operability.

[0008]

According to the present invention, there is provided a method for removing ink from a printing press, comprising the steps of: (1) setting an inking roller and a watering roller on a plate cylinder; The method further includes an ink removing step of removing the watering roller from a roller group of a water supply device.

(2) In the ink removing step, the printing cylinder is not in contact with the printing cylinder and the printing cylinder is not in the OFF state where printing is not possible and the call-off state where ink cannot be supplied to the plate surface of the printing cylinder. It is characterized by being performed.

(3) An ink regenerating step of removing the ink forming roller and the water setting roller from the plate cylinder after the ink removing step.

(4) In the ink regenerating step, the printing cylinder is not in contact with the plate cylinder, and the printing cylinder is in an OFF state where printing is not possible, and the call-off state where ink cannot be supplied to the plate surface of the plate cylinder. It is characterized by being performed.

(5) After the ink regenerating step, the watering roller is set on the roller group of the water supply device and the plate cylinder, and then the ink forming roller is set on the plate cylinder. It is characterized in that it shifts to a plate surface reproducing step.

(6) In the step of regenerating the plate, the printing cylinder is in an OFF state where the printing cylinder is not in contact with the printing cylinder and the printing cylinder is in an OFF state and ink cannot be supplied to the plate surface of the printing cylinder.
It is performed in the FF state.

(7) When printing is performed after the ink regenerating step, and then when the printing press is stopped, the ink forming roller is removed from the plate cylinder before the water forming roller is removed from the plate cylinder. It is characterized by going through a process of reducing ink printing.

(8) In the item (7), a call-out OF in which the printing cylinder is not in contact with the printing cylinder and the printing cylinder is in an OFF state where printing cannot be performed and ink cannot be supplied to the printing plate of the printing cylinder.
Before the water roller is removed from the plate cylinder in the F state, the printing cylinder is brought into contact with the plate cylinder, printing is possible, and ink cannot be supplied to the plate surface of the plate cylinder. The inking roller is detached from the plate cylinder in the off state.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for removing ink from a printing press according to the present invention will be described in detail with reference to the drawings with reference to embodiments.

[Embodiment] FIG. 1 is a process diagram of an ink removing mode before starting printing in an offset rotary printing press according to an embodiment of the present invention, and FIG. FIG. 3 is a process diagram and FIG.

As shown in the figure, a pair of blanket cylinders 10 (one not shown) contacting each other and a pair of plate cylinders 1 (one not shown) contacting each of the pair of blanket cylinders 10 are shown. Before the automatic operation mode (sixth to tenth steps) of an offset rotary printing press in which printing is performed simultaneously on the front and back surfaces of a running web by a printing unit having the same, the ink removal mode (first step to first step) according to the present invention. 5 steps) are set.

In the drawing, reference numeral 1 denotes a blanket cylinder 1 as a printing cylinder.
Reference numeral 0 denotes a plate cylinder. Reference numeral 2 denotes a watering roller constituting a water supply device. The water transferred from a water boat (not shown) to a water supply roller 3 and a transfer roller (metering roller) 4 is supplied to the plate cylinder 2. It can be supplied to the surface of the plate mounted on the peripheral surface (hereinafter referred to as the plate surface). Reference numeral 5 denotes an ink forming roller which constitutes an inking unit, and supplies the ink transferred from the ink fountain 9 to the plate surface via an ink fountain roller 8, an ink retrieving roller 7, and an ink roller group 6 such as an ink kneading roller and an ink wiping roller. It is possible to do.

The operation of the dipping roller 2 is as follows: the operation of attaching (ON) only to the plate cylinder 1, the operation of attaching to both the plate cylinder 1 and the transfer roller 4, and the state of attaching to the transfer roller 4. There is an operation of detaching (OFF) from the plate cylinder 1 and an operation of detaching (OFF) from the plate cylinder 1 and the transfer roller 4, and the operation of the inking roller 5 is as follows (ON). And an operation of removing (OFF) from the plate cylinder 1. Switching between these attaching and detaching operations is performed by an attaching and detaching mechanism including a lever, an air cylinder, and the like (not shown).

In the drawing, "cylinder OFF" means that one blanket cylinder 10 is detached from the plate cylinder 1 and the other blanket cylinder (not shown) is detached from the plate cylinder (not shown).
0 indicates a non-printable state in which the cylinders are separated from each other, and “cylinder ON” indicates that one blanket cylinder 10 is in contact with the plate cylinder 1 and the other blank cylinder is not in contact with the plate cylinder (not shown). In this state, a printable state in which the pair of blanket cylinders 10 are in contact with each other is referred to. Similarly, "calling OFF" in the drawing means a state in which the ink feeding roller 7 is separated from the ink roller group 6 on the downstream side (in a state of being attached to the ink fountain roller 8) and cannot supply ink to the plate surface. “Calling ON” means that the ink calling roller 7 is moved to the ink fountain roller 8 and the ink roller group 6.
Is a state in which ink can be supplied by reciprocating with the roller at the most upstream side.

Next, the ink removal mode will be described in the order of steps. First, in the first step (entirely removing step), "Body OFF"
Then, under the state of “pick-off”, the watering roller 2 is moved and attached to the roller 4 (or may be removed), and the ink cylinder roller 5 and the watering roller 2 are completely removed from the plate cylinder 1. Drive the machine from the state.

In this state, an image portion and a non-image portion are formed on the plate surface, but the emulsified ink is entangled in the water-applying roller 2.

Next, in the second step (ink removal step), the watering roller 2 is moved off the transfer roller 4 under the state of "cylinder OFF" and "calling off", and the ink is applied to the plate cylinder 1. The application roller 5 and the water application roller 2 are brought into the application state.

As a result, the ink entangled (piled) on the dampening roller 2 is increased in stickiness because the water is shut off, and is transferred to the plate surface of the plate cylinder 1, and is further transferred to the inking roller 5 side. The ink is removed from the wetting roller 2 by being sucked up.

In this state, the plate surface is similarly blocked from water, so that the image portion and the non-image portion are not formed, and the plate surface is in a solid state.

Next, in a third step (ink regenerating step), the watering roller 2 is removed from the transfer roller 4 (or may be in a worn state) under the state of the “barrel OFF” and the “calling OFF”. The ink setting roller 5 and the water setting roller 2 are detached from the plate cylinder 1.

As a result, the emulsified ink remaining on the downstream side of the ink roller group 6 including the ink application roller 5 is mixed with the raw ink on the upstream side, and the water is removed to regenerate the ink.

In this state, since the printing plate is still blocked from water, the image portion and the non-image portion are not formed and are in a solid state.

In this way, the ink is removed from the dampening roller 2 and the ink staying in the ink roller group 6 is regenerated. When the degree of emulsification of the ink is particularly high (severe), this ink is removed. When you start printing from the status,
Since the plate surface is in a solid state, there is a possibility that the web is wound up and the paper is cut.

Therefore, in the present embodiment, in the fourth and fifth steps (printing surface regenerating step), the image portions and the non-image portions of the printing plate are rapidly reproduced (the degree of emulsification of the ink is low). In this case, the fourth and fifth steps may be omitted).

That is, in the fourth step, under the state of "cylinder OFF" and "calling off", the watering roller 2 is moved and attached to the transfer roller 4, and the watering roller 2 is attached to the plate cylinder 1. Thereby, water is supplied to the plate to wash the plate.

Next, in a fifth step, the ink forming roller 5 is set on the plate cylinder 1 in the state of "cylinder OFF" and "calling off", whereby the excess ink in the non-image area is removed. Is sucked up to the ink applying roller 5 side, and ink is supplied to the image area to form an image area and a non-image area on the plate surface.

Thereafter, the operation shifts to the conventional automatic operation mode (print preparation step). That is, “Torso OFF” and “Call O
In the state of "FF", the watering roller 2 is moved and removed from the roller 4 (or may be in the mounted state), and the ink removing roller 5 and the watering roller 2 are removed from the plate cylinder 1 in the completely removed state. From the 6th step, the watering roller 2 is transferred and attached to the roller 4,
After passing through a seventh step of placing the watering roller 2 on the plate cylinder 1 and an eighth step of placing the ink roller 5 on the plate cylinder 1, a seventh step of turning the cylinder ON is described. 9 steps,
In addition, the process proceeds to the tenth step of setting the state of “call ON”.

In this embodiment, as shown in FIG.
When the printing is performed after the sixth step (or the third step), and then the printing machine is decelerated and stopped, the printing drum 2 is transferred to the printing drum 1 prior to the step of transferring the dipping roller 2 and removing it from the printing drum 1. And removing the ink application roller 5 from the ink application roller 5.

That is, under the state of "cylinder ON" and "calling ON", the wet roller 2 is attached to the transfer roller 4, and the wet roller 2 and the ink roller 5 are attached to the plate cylinder 1. From the step I in which the deceleration stop of the apparatus is started in the state, the process first proceeds to the step II in which the state is set to the state of "calling OFF", and the amount of ink retained in the ink roller group 6 including the ink forming roller 5 is reduced. I do.

Next, "torso ON" and "calling OFF"
Then, the process proceeds to the third step of removing the ink setting roller 5 from the plate cylinder 1 under the condition (1). After the ink remaining on the water setting roller 2 and the plate surface is reduced, the "cylinder OFF" and "recall" are performed. Under the state of "OFF", the process proceeds to the fourth step of the fully detached state in which the dampening roller 2 has been moved from the transfer roller 4 and the plate cylinder 1 (note that even if the dampening roller 2 and the transfer roller 4 are in the worn state, good).

Removal of ink after printing (reduction of printing)
Depending on the mode, the time required for the above-described ink removal mode before the start of printing can be reduced. In some cases, the conventional deceleration stop mode may be executed by omitting the ink removal (reduction) mode after printing.

As described above, in the present embodiment, it is possible to change the attachment / detachment timing of the conventional watering roller 2 and ink forming roller 5 without using the lid roller or the like by using the watering roller 2 and the plate cylinder. Ink can be removed with a high degree of accuracy from 1 and the ink retained in the ink roller group 6 including the ink application roller 5 can be regenerated after printing, so that the printing quality can be improved.

Further, since the timing of attaching and detaching the water-applying roller 2 and the ink-applying roller 5 is merely devised, there is no restriction on roller arrangement and space in the printing press, and a highly versatile ink removing method can be realized.

The present invention is not limited to the above embodiment, and it goes without saying that various changes such as changing the number of rollers of the water supply device are possible without departing from the spirit of the present invention. The present invention is also applicable to a printing press in which an impression cylinder is in contact with the plate cylinder 1 as a printing cylinder.

[0042]

As described above, according to the present invention, the ink forming roller and the water setting roller are set on the plate cylinder, and the water setting roller is detached from the roller group of the water supply device. Since the method has an ink removing step, it is possible to remove ink from a wet roller or the like with high accuracy by simple means. Also, since the timing of attaching and detaching the rollers and the like is merely devised, there is no restriction on the roller arrangement and space, and a highly versatile ink removing method can be realized.

Further, the method includes an ink regenerating step of removing the ink forming roller and the water setting roller from the plate cylinder after the ink removing step, so that the ink remaining in the ink roller group after printing is regenerated. And print quality can be improved.

Also, after the ink regenerating step, the water replenishing roller is brought into a state of being attached to the roller group of the water supply device and the plate cylinder, and thereafter, the plate surface regenerating the ink inking roller being in a state of being attached to the plate cylinder. Since the process shifts to the process, the image portions and the non-image portions can be quickly reproduced from the solid printing plate, and the breakage of the web is avoided.

Further, when printing is performed after the ink regenerating step or the plate surface regenerating step, and the printing press is thereafter stopped, the ink forming roller is attached to the plate cylinder before the water roller is removed from the plate cylinder. In this case, the ink remaining in the watering roller and the plate cylinder can be reduced, and the time required for the ink removal mode before the start of printing can be reduced.

[Brief description of the drawings]

FIG. 1 is a process diagram of an ink removing mode before starting printing in an offset rotary printing press according to an embodiment of the present invention.

FIG. 2 is a process diagram of an ink removal (print reduction) mode after printing is completed.

FIG. 3 is an explanatory diagram of the ink device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plate cylinder 2 watering roller 3 water source roller 4 transfer roller 5 ink application roller 6 ink roller group 7 ink recall roller 8 ink fountain roller 9 ink fountain 10 rubber cylinder

Claims (8)

[Claims] 1. An ink removing step for setting an ink forming roller and a water setting roller on a plate cylinder and disengaging the water setting roller from a roller group of a water supply device. Printing machine ink removal method. 2. The method according to claim 1, wherein the step of removing the ink includes a call-off OF in which the printing cylinder is not in contact with the printing cylinder and the printing cylinder is in an OFF state and printing cannot be performed on the printing surface of the printing cylinder.
The method according to claim 1, wherein the method is performed in a state F. 3. The printing press according to claim 1, further comprising an ink regenerating step of removing the ink forming roller and the water setting roller from the plate cylinder after the ink removing step. Ink removal method. 4. The ink regenerating step includes a call-off OF in which a printing cylinder is not in contact with the plate cylinder and a non-printable cylinder is in an OFF state and ink cannot be supplied to a plate surface of the plate cylinder.
The method according to claim 3, wherein the method is performed in a state F. 5. A printing plate which, after said ink regenerating step, brings said watering roller into contact with said roller group of said water supply device and said plate cylinder, and then brings said inking roller into contact with said plate cylinder. 4. The method for removing ink from a printing press according to claim 3, wherein the method proceeds to a regeneration step. 6. The printing plate regenerating step, wherein the printing cylinder is in an OFF state in which a printing cylinder is not in contact with the printing cylinder and an unprintable cylinder is in an OFF state and ink cannot be supplied to the printing plate of the printing cylinder.
The method for removing ink from a printing press according to claim 5, wherein the method is performed in a state. 7. When printing is performed after the ink regenerating step, and then when the printing press is stopped, the ink forming roller is removed from the plate cylinder before the water roller is removed from the plate cylinder. 4. The method for removing ink from a printing press according to claim 3, further comprising a step of reducing the amount of ink printing. 8. The water-applying roller is placed in a printing-off cylinder in which the printing cylinder is not in contact with the printing cylinder and an ink-off state in which ink cannot be supplied to the plate surface of the printing cylinder. Before being removed from the cylinder, the printing cylinder is brought into contact with the printing cylinder and the printing cylinder is in an ON state in which printing is possible, and a call-off state in which ink cannot be supplied to the plate surface of the printing cylinder. The method according to claim 7, wherein the ink-applying roller is removed from the ink-applying roller.