JP2560388B2 - Ink supply method in proof press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a proof printing machine, and particularly to an inking roller when a printing by a previous printing plate is finished and a new printing by this printing plate is started. The present invention relates to an ink supply method in a proof printing press, in which the balance of the ink supply amount in the upper axial direction is performed by taking into consideration the information at the time of printing by the previous printing plate.

[Prior Art] Conventionally, in proof printing with a proof printing machine, when printing with the previous printing plate is finished and new printing with this printing plate is started, ink supply to the inking roller is
It does not use any information from the previous printing of the printing plate. That is, there are roughly two means that the operator performs at this time. One of the methods is to clean the inking roller together with the blanket roller after a certain printing, and then apply the ink to the inking roller again for printing with a new printing plate. However, this method is not used so much because it has many bad factors such as operator's trouble, time loss and ink loss.

The other is a method in which the inking roller is not washed when a certain printing is completed, and an appropriate amount of ink is replenished to the inking roller for printing by the printing plate this time. In this method, it is important to knead the ink by rotating the inking roller. That is, the amount of ink on the inking roller is uneven in the axial direction due to the previous printing. If this point is not fully grasped and ink is replenished almost uniformly and printing is performed this time as it is, there is uneven density due to the previous pattern, or there is a density difference due to the edge of the previous pattern. It becomes a certain print. Therefore, in order to avoid this, the operator takes a long time to rotate the inking roller as long as possible, and wastes the number of printed sheets. However, even with this method, time loss, printing paper loss, etc. occur.

[Problems to be Solved by the Invention] On the other hand, recently, various automatic ink supply devices have begun to be developed and put into practical use. This is effective for ink supply during continuous printing with the same printing plate, but it does not use the information from the printing performed by the previous printing plate, so the problem described above Has not been resolved as before.

The present invention has been made to solve the above problems, it is not necessary to wash the ink of the inking roller every time the printing plate changes, and reduce the number of wasted sheets printed by a new printing plate. Another object of the present invention is to provide an ink supply method in a proof printing machine, which can shorten the kneading time for uniformizing the ink by rotating the inking roller.

[Means for Solving the Problems] In order to achieve the above object, in a method of supplying ink to an inking roller of a proof printing machine, printing by the previous printing plate is completed and When printing is started, the ink is supplied to the inking roller. First, in the invention corresponding to claim 1, the pattern area information of the previous printing plate, the pattern area information of the current printing plate, and the previous The supply amount is varied in the axial direction on the inking roller based on the density information of the printed matter.

In the invention corresponding to claim 2, the image part information of the previous printing plate in the axial direction of the inking roller, the image part information of the current printing plate in the axial direction of the inking roller, and the previous printing image The supply amount is varied in the axial direction on the inking roller based on the number of printed sheets after the final automatic ink supply during printing by the plate.

[Operation] Therefore, in the ink supply method of the present invention, the axial direction and the ink unevenness on the inking roller caused by the printing by the previous printing plate are quickly made uniform, or the inking roller for printing by the new printing plate is used. It is possible to balance the upper ink supply amount.

[Embodiment] In the present invention, in order to grasp the axial unevenness on the inking roller after the printing by the previous printing plate is completed, the pattern area information by the previous printing plate and the pattern area by the current printing plate are used. Using the information and the density information of the previous printed matter, for example, if it is an ink or spatula, the operator is informed of the axial ink amount and balance on the inking roller to be supplied. In the case of an automatic ink supply device, the above information is given to the automatic ink supply device as information to supply ink to the inking roller.

Hereinafter, an embodiment of the present invention based on the above-described concept will be described with reference to the drawings.

FIG. 1 is a block diagram showing an ink supply method in a proof press according to the present invention. In this example,
The information at the time of printing by the previous printing plate is used as the information from the pattern area ratio meter, that is, the pattern area information of the previous printing plate. In the present embodiment, when the printing by the previous printing plate is finished and the new printing by the current printing plate is started, the ink supply to the inking roller is changed from the previous one which is the information from the pattern area ratio meter. The supply amount is varied in the axial direction on the inking roller based on the pattern area information of the printing plate.

 This point will be described in detail with reference to FIG.

First, information on the image area of the previous printing plate in the axial direction of the inking roller is stored. Next, along with information on how many sheets were printed after the last automatic ink supply,
The current ink amount balance on the inking roller is estimated by a processing device (not shown). In this case, of course, the smaller the number of printed sheets,
There is little ink unevenness on the inking roller.

Next, with the information of the image area of the plate of this printing in the axial direction of the inking roller, the processing device calculates so that the ink amount will be slightly larger in the part where the ink is slightly increased in this printing. Ink is supplied by the automatic ink supply device based on the calculation result. This completely eliminates ink unevenness on the inking roller due to the previous printing plate and prepares for new printing with the current printing plate.

FIGS. 2 (a) and 2 (b) show the required ink amount according to the pattern area of the previous printing plate. As the printing is performed, the ink remaining on the inking roller is consumed due to the ink consumption of the image area. The quantity decreases. FIG. 2 (c) shows
This shows the residual ink amount estimated by adding the number of printed sheets after the final automatic ink supply as a coefficient. The larger the number of printed sheets after the last automatic ink supply, the smaller the remaining ink amount. Here, as the coefficient, the ink consumption amount of each portion per sheet is obtained by storing how many sheets of ink have been supplied together with the balance of the supply amount, and this is multiplied by the number of sheets.

Further, FIGS. 3 (a) to 3 (c) show the required ink amount of the printing plate this time. Here, an insufficient portion of the residual ink amount on the inking roller (FIG. 2 (c)) from uniform,
The ink amount to be supplied (Fig. 3 (c)), that is, (Fig. 3 (d)), is obtained by adding the required ink amount of this time (Fig. 3 (b)).

By the above method, the unevenness of the residual ink amount remaining on the inking roller due to the printing with the previous printing plate is canceled, and the ink amount in the axial direction on the inking roller is balanced for printing with this printing plate. Can be made.

As described above, by adopting the ink supply method according to the present embodiment, it is not necessary to wash the ink of the inking roller, and the printing plate of this time is not affected by the printing of the previous printing plate. It is possible to shift to new printing. As a result, operator labor, time loss, printing paper loss, ink loss, etc. can be significantly reduced. Further, since the printing speed of the proof printing is slow, the reduction of the printed printing contributes to the improvement of the production efficiency.

As described above, according to the invention corresponding to claim 1, first, when the printing by the previous printing plate is finished and the new printing by the current printing plate is started, the ink on the inking roller is changed. The supply is performed by changing the supply amount in the axial direction on the inking roller based on the pattern area information of the previous printing plate, the pattern area information of the current printing plate, and the density information of the previous printed material. Since it is not necessary to wash the ink on the inking roller every time the printing plate changes, the number of wasted printouts by the new printing plate is reduced, and the kneading time for uniforming the ink by rotating the inking roller is reduced. It is possible to provide an ink supply method for a proof press that can be shortened.

Further, according to the invention corresponding to claim 2, when the printing by the previous printing plate is completed and the new printing by the current printing plate is started, the ink is supplied to the inking roller,
Image information of the previous printing plate in the axial direction of the inking roller, image information of the current printing plate in the axial direction of the inking roller, and information after the last automatic ink supply during printing by the previous printing plate Based on the number of prints, the supply amount was changed in the axial direction on the inking roller.
Since it is not necessary to wash the ink on the inking roller every time the printing plate changes, it is possible to reduce the number of wasted sheets for printing with a new printing plate and shorten the kneading time for equalizing the ink by rotating the inking roller. It is possible to provide a possible method of supplying ink in a proof press.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an ink supply method in a proof press according to the present invention, and FIG.
(C) and FIGS. 3 (a) to 3 (d) are views for explaining the operation in the same embodiment, respectively.

Claims (2)

(57) [Claims] 1. A method for supplying ink to an inking roller of a proof press, wherein ink is supplied to the inking roller when printing by the previous printing plate is completed and new printing by this printing plate is started. Is supplied by changing the supply amount in the axial direction on the inking roller based on the pattern area information of the previous printing plate, the pattern area information of the current printing plate, and the density information of the previous printed plate. A method for supplying ink to a proof press, which is characterized in that 2. A method for supplying ink to an inking roller of a proof printing machine, wherein ink is supplied to the inking roller when printing by the previous printing plate is completed and new printing by this printing plate is started. Is supplied to the inking roller axial direction information of the previous printing plate, the inking roller axial direction image information of this printing plate, and the final automatic printing during printing by the previous printing plate. A method for supplying ink in a proof printing press, wherein the supply amount is varied in the axial direction on the inking roller based on the number of printed sheets after the ink is supplied.