JP4824192B2 - Ink removal method for printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink removing method for an offset rotary printing press or the like.
[0002]
[Prior art]
In a planographic printing press such as a rotary offset printing press, an image is formed on the surface of a plate mounted on a plate cylinder by ink and water respectively supplied from an ink device and a water supply device (dampening device). Printing is performed by transferring the image directly or through a rubber cylinder to paper.
[0003]
In general, the ink device transfers ink stored in an ink fountain, such as an ink fountain roller, an ink calling roller, an ink kneading roller, an ink shaking roller, an ink application roller, and supplies the ink to the plate surface. ing.
[0004]
On the other hand, the water supply device includes a water boat in which water is stored, a water source roller that rotates by being immersed in the water in the water boat, a swim roller that rotates with its peripheral surface in contact with the plate surface, There is a transfer roller (metering roller) between the water source roller and the swim roller, and the peripheral surfaces of these rollers are in contact with each other. The water pulled up by the water source roller passes through the transfer roller to the water. It is continuously transferred to the form roller and supplied to the printing plate.
[0005]
[Problems to be solved by the invention]
By the way, in the above-described lithographic printing machine, when printing progresses, a phenomenon occurs in which the ink emulsified by the supply of water from the water supply device is entangled with the swim roller. As this phenomenon progresses, water supply from the water supply device is not smoothly performed and printing stains occur, so that it is necessary to remove ink from the swim roller at a predetermined time.
[0006]
Japanese Patent Application Laid-Open No. 7-171943 discloses a configuration in which a rider roller bridges between a water application roller and an ink application roller. Even with this configuration, the water film thickness of the water roller can be kept constant and ink can be prevented from being entangled with the water roller, but it can be widely applied to lithographic printing machines by increasing the number of rollers in a small installation space. There was a problem that it could not be done and lacked versatility.
[0007]
Therefore, an object of the present invention is a versatile device capable of removing ink from a swim roller or the like with high accuracy by a simple means of changing the attachment / detachment timing of a conventional roller or the like without using a rider roller or the like. It is to provide a method for removing ink from a printing press.
[0008]
[Means for Solving the Problems]
To achieve the above object, the ink removing method of the printing press according to the present invention is as follows.
(1) An ink removing step is provided in which the ink form roller and the water form roller are put on the plate cylinder, and the water roller is removed from the roller group of the water supply device.
[0009]
(2) The ink removal step is performed in an unprintable cylinder OFF state where a printing cylinder does not contact the plate cylinder and in a call OFF state in which ink cannot be supplied to the plate surface of the plate cylinder , By the ink removing step, the emulsified ink that has been piled on the water roller is transferred to the ink roller via the plate cylinder .
[0010]
(3) the said ink form roller to the plate cylinder after ink removing step and said dampening rollers have a higher ink regeneration engineering to de state, by the ink regeneration step, the ink roller comprising inking rollers The emulsified ink staying on the downstream side of the group is mixed with the ink on the upstream side of the ink roller group to regenerate the ink .
[0011]
(4) The ink regeneration step is performed in an unprintable cylinder OFF state in which a printing cylinder does not contact the plate cylinder, and in a call OFF state in which ink cannot be supplied to the plate surface of the plate cylinder. It is characterized by.
[0012]
(5) A plate surface regeneration step in which, after the ink regeneration step, the swim roller is put on the roller group of the water supply device and the plate cylinder, and then the ink roller is put on the plate cylinder. It is characterized by shifting to.
[0013]
(6) The plate surface regeneration step is performed in an unprintable cylinder OFF state in which a printing cylinder does not contact the plate cylinder, and in a call OFF state in which ink cannot be supplied to the plate cylinder surface. It is characterized by.
[0014]
(7) Ink that performs printing after the ink regeneration step, and then causes the ink form roller to be removed from the plate cylinder before removing the swim roller from the plate cylinder when the printing machine is stopped. It is characterized by undergoing a printing reduction process.
[0015]
(8) In the item (7), the swimsuit is in a non-printable cylinder OFF state in which a printing cylinder does not contact the plate cylinder, and in a call OFF state in which ink cannot be supplied to the plate surface of the plate cylinder. Before removing the roller from the plate cylinder, the printing cylinder is brought into contact with the plate cylinder and the printing cylinder is in the ON state, and the ink is not supplied to the plate surface of the plate cylinder in the calling OFF state. The inking roller is removed from the plate cylinder.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an ink removing method for a printing press according to the present invention will be described in detail with reference to the accompanying drawings.
[0017]
[Example]
FIG. 1 is a process diagram of an ink removal mode before the start of printing in an offset rotary printing press showing an embodiment of the present invention, FIG. 2 is a process diagram of an ink removal (print reduction) mode after the end of printing, and FIG. It is explanatory drawing of an apparatus.
[0018]
As shown in the figure, a printing unit having a pair of rubber cylinders 10 (one not shown) in contact with each other and a pair of plate cylinders 1 (one not shown) in contact with each of the pair of rubber cylinders 10. Ink removal mode (first step to fifth step) according to the present invention before the automatic operation mode (sixth step to tenth step) of the rotary offset printing press that simultaneously prints on the front and back surfaces of the traveling web. Is set.
[0019]
In the figure, reference numeral 1 denotes a plate cylinder that is in contact with a rubber cylinder 10 as a printing cylinder, and 2 is a swim roller that constitutes a water supply device, from a water boat (not shown) through a water source roller 3 and a transfer roller (metering roller) 4. The transferred water can be supplied to the surface of the plate mounted on the peripheral surface of the plate cylinder 1 (hereinafter referred to as the plate surface). Reference numeral 5 denotes an ink form roller constituting an inking device, which supplies ink transferred from an ink fountain 9 to an ink fountain roller 8, an ink calling roller 7, an ink kneading roller, and an ink roller group 6 such as an ink shaking roller. It has come to be able to do.
[0020]
Then, the operation of the swim roller 2 is as follows: an operation that is applied (ON) only to the plate cylinder 1, an operation that is applied to both the plate cylinder 1 and the transfer roller 4, and a plate cylinder that is attached to the transfer roller 4. There are an operation of removing (OFF) from 1 and an operation of removing (OFF) from the plate cylinder 1 and the transfer roller 4, and the operation of the ink form roller 5 is an operation of attaching (ON) to the plate cylinder 1. There is an operation of removing (OFF) from the plate cylinder 1. These attachment / detachment operations are switched by an attachment / detachment mechanism including a lever and an air cylinder (not shown).
[0021]
In the figure, “cylinder OFF” indicates that one rubber cylinder 10 is detached from the plate cylinder 1 and the other rubber cylinder (not shown) is removed from the plate cylinder (not shown), and the pair of rubber cylinders 10 are separated from each other. A state in which printing is not possible is referred to as “cylinder ON” means that one rubber cylinder 10 is brought into contact with the plate cylinder 1 and the other rubber cylinder (not shown) is brought into contact with a plate cylinder (not shown). Are in a printable state where they are in contact with each other. Similarly, “calling OFF” in the drawing means a state in which the ink calling roller 7 is separated from the ink roller group 6 on the downstream side (attached to the ink fountain roller 8) and ink cannot be supplied to the printing plate. “Calling ON” refers to a state in which ink can be supplied by the ink calling roller 7 reciprocatingly moved between the ink fountain roller 8 and the most upstream roller of the ink roller group 6.
[0022]
Next, the ink removal mode will be described in the order of steps.
First, in the first step (total removal step), the swim roller 2 is moved to the transfer roller 4 (or may be in a detached state) under the “cylinder OFF” and “calling OFF” states. Then, the apparatus is driven from the fully removed state in which the ink form roller 5 and the water form roller 2 are removed.
[0023]
In this state, an image line portion and a non-image line portion are formed on the plate surface, but the emulsified ink is tangled in the swim roller 2.
[0024]
Next, in the second step (ink removing step), the water roller 2 is moved away from the transfer roller 4 under the same conditions of “cylinder OFF” and “calling OFF”. And the swim roller 2 are put on.
[0025]
As a result, the ink entangled (piled) on the water application roller 2 is increased in viscosity because the water is blocked, and is transferred to the plate surface of the plate cylinder 1 and further sucked up to the ink application roller 5 side. Then, the ink is removed from the swim roller 2.
[0026]
In this state, the plate surface is similarly blocked from water, so that no image area / non-image area is formed and the plate surface is in a solid state.
[0027]
Next, in the third step (ink regeneration step), the swim roller 2 is moved away from the transfer roller 4 (or may be in a worn state) in the same state of “cylinder OFF” and “calling OFF”. In contrast, the ink form roller 5 and the water form roller 2 are brought into a detached state.
[0028]
As a result, the emulsified ink staying on the downstream side of the ink roller group 6 including the ink form roller 5 is mixed with the upstream raw ink, moisture is removed, and the ink is regenerated.
[0029]
In this state, since the water is still blocked from the printing plate, the image area and the non-image area are not formed and the plate surface is in a solid state.
[0030]
In this way, the ink is removed from the swim roller 2 and the ink staying in the ink roller group 6 is regenerated. If the degree of emulsification of the ink is particularly high (severe), printing is started from this state. Is started, the plate surface is in a solid state, so there is a possibility that the web is rolled up and the paper is cut.
[0031]
Therefore, in the present embodiment, in the fourth and fifth steps (plate surface regeneration step), the image area and non-image area of the plate surface are quickly regenerated (in the case where the degree of ink emulsification is low, (The fourth and fifth steps may be omitted).
[0032]
That is, in the fourth step, under the “cylinder OFF” and “calling OFF” states, the swim roller 2 is attached to the transfer roller 4, and the swim roller 2 is attached to the plate cylinder 1, thereby The plate surface is cleaned by supplying water to the plate surface.
[0033]
Next, in the fifth step, the ink form roller 5 is put on the plate cylinder 1 in the state of “cylinder OFF” and “calling OFF”, so that excess ink in the non-image area is inked. The ink is sucked up to the roller 5 side, and ink is supplied to the image area, so that the image area and the non-image area are formed on the plate surface.
[0034]
Thereafter, the process shifts to the conventional automatic operation mode (print preparation process).
That is, in the state of “cylinder OFF” and “calling OFF”, the swim roller 2 is moved away from the transfer roller 4 (or may be in a worn state), and the ink form roller 5 and the swim roller 2 with respect to the plate cylinder 1. From the sixth step of the fully-removed state in which the step is taken off, the swim roller 2 is moved and attached to the roller 4, and the seventh step and the plate cylinder 1 to put the swim roller 2 on the plate cylinder 1. After passing through the eighth step of setting the ink form roller 5 in the wearing state, the process proceeds to the ninth step of setting the “cylinder ON” state and the tenth step of setting the “calling ON” state.
[0035]
Further, in this embodiment, as shown in FIG. 2, when the printing is performed after the sixth step (or the third step) and then the machine is decelerated and stopped, the swim roller 2 is moved to the roller 4 and the plate cylinder. Prior to the step of removing the ink from the ink-jet printer 1, the ink forming roller 5 is removed from the plate cylinder 1.
[0036]
That is, in the state of “cylinder ON” and “calling ON”, the swim 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 first step of starting the decelerating stop of the machine, first, the second step of changing to the “calling OFF” state is shifted to the second step, and the ink remaining in the ink roller group 6 including the ink form roller 5 is reduced.
[0037]
Next, in the state of “cylinder ON” and “calling OFF”, the process proceeds to the step III where the ink form roller 5 is removed from the plate cylinder 1 to reduce the printing of the ink remaining on the wet roller 2 and the plate surface. After performing, under the state of “cylinder OFF” and “calling OFF”, the swim roller 2 is transferred to the roller 4 and the plate cylinder 1 and the process is shifted to the fully removed state IV process (note that the The roller 2 and the transfer roller 4 may be in a wearing state).
[0038]
This ink removal (printing reduction) mode after the end of printing makes it possible to shorten the time required for the ink removal mode before the start of printing described above. In some cases, the conventional deceleration stop mode may be executed by omitting the ink removal (reduction) mode after the end of printing.
[0039]
In this way, in this embodiment, a simple means of changing the attachment and detachment timing of the conventional water application roller 2 and the ink application roller 5 without using a rider roller or the like is used to increase the height of the water application roller 2 and the plate cylinder 1 from each other. Ink can be removed with high accuracy, and the ink staying in the ink roller group 6 including the ink forming roller 5 can be regenerated after printing, and the printing quality can be improved.
[0040]
Further, since the attachment / detachment timing of the water application roller 2 and the ink application roller 5 is simply devised, a highly versatile ink removal method can be realized without any limitation on the roller arrangement and space in the printing press.
[0041]
Needless to say, the present invention is not limited to the above-described embodiments, and various modifications such as changing the number of rollers of the water supply device are possible without departing from the scope of the present invention. The present invention can also be applied to a printing machine in which an impression cylinder is in contact with the plate cylinder 1 as a printing cylinder.
[0042]
【The invention's effect】
As described above, according to the present invention, the ink removing step of placing the ink form roller and the water form roller on the plate cylinder and removing the water form roller from the roller group of the water supply device. Therefore, the ink can be removed with high accuracy from the swim roller or the like by a simple means. In addition, since the timing of attaching and detaching the rollers and the like is merely devised, a highly versatile ink removing method can be realized without any restrictions on roller arrangement and space.
[0043]
In addition, since it has an ink regeneration step for removing the ink form roller and the water application roller with respect to the plate cylinder after the ink removing step, the ink staying in the ink roller group after the printing can be reproduced, Print quality can be improved.
[0044]
In addition, after the ink regeneration process, the printing roller is moved to a plate surface regeneration process in which the water roller is attached to the roller group of the water supply device and the plate cylinder, and then the ink roller is attached to the plate cylinder. As a result, the image line portion and the non-image line portion can be quickly reproduced from the solid plate, and the web break is avoided.
[0045]
In addition, when printing is performed after the ink regeneration process or the plate surface regeneration process, and then the printing machine is stopped, the ink form roller is removed from the plate cylinder before the swim roller is removed from the plate cylinder. Therefore, the ink staying on the swim roller and the plate cylinder can be reduced, and the time required for the ink removal mode before the start of printing can be shortened.
[Brief description of the drawings]
FIG. 1 is a process diagram of an ink removal mode before starting printing in an offset rotary printing press showing 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 view of the inking device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Water roller 3 Water source roller 4 Transfer roller 5 Ink roller 6 Ink roller group 7 Ink calling roller 8 Ink fountain roller 9 Ink fountain 10 Rubber cylinder

Claims (6)

An ink removing step for placing the ink form roller and the water roller on the plate cylinder and removing the water roller from the roller group of the water supply device; The printing cylinder is not in contact with the plate cylinder and the printing cylinder is in the OFF state, and the ink is not supplied to the plate surface of the plate cylinder. In addition to transferring the emulsified ink that has been piled up to the ink form roller via the plate cylinder, the ink regenerating step for removing the ink form roller and the water form roller from the plate cylinder after the ink removing step is provided. By the ink regeneration process, the emulsified ink staying at the downstream side of the ink roller group including the ink form roller is mixed with the ink at the upstream side of the ink roller group. Ink removal method for a printing press, characterized by play. The ink regeneration step is performed in an unprintable cylinder OFF state in which a printing cylinder does not contact the plate cylinder and in a call OFF state in which ink cannot be supplied to the plate surface of the plate cylinder. The ink removing method for a printing press according to claim 1 . After the ink regeneration process, the swim roller is put on the roller group of the water supply device and the plate cylinder, and then the process proceeds to a plate surface regeneration process where the ink form roller is put on the plate cylinder. The ink removing method for a printing press according to claim 1 . The plate surface regeneration step is performed in an unprintable cylinder OFF state in which a printing cylinder does not contact the plate cylinder and in a call OFF state in which ink cannot be supplied to the plate surface of the plate cylinder. The ink removing method for a printing press according to claim 3 . Ink reduction process for performing printing after the ink regeneration process and then removing the ink form roller with respect to the plate cylinder before removing the swim roller from the plate cylinder when the printing machine is stopped. The ink removing method for a printing press according to claim 1, wherein: Before removing the swim roller from the plate cylinder in a non-printable cylinder OFF state in which the printing cylinder does not contact the plate cylinder and in a call OFF state in which ink cannot be supplied to the plate surface of the plate cylinder Further, the inking roller is in contact with the plate cylinder in an ON state in which the printing cylinder is brought into contact with the plate cylinder and in a state where the printing cylinder is ON and ink cannot be supplied to the plate surface of the plate cylinder. The ink removing method for a printing press according to claim 5, wherein the ink is removed.

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