Printing – Intaglio – Bed-and-cylinder machines
Patent
1988-06-06
1991-02-05
Fisher, J. Reed
Printing
Intaglio
Bed-and-cylinder machines
101269, 101170, B41F 320, B41F 336, B41F 351
Patent
active
049895133
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a method for high accuracy printing test for gravure printing and an apparatus for doing the same.
2. Background Art
In the field of printing, the impression quality of printed matters depends upon various factors, but among others, the tint or nuance of inks used in the printing is an extremely important factor. Normally, to obtain a color matching of a color sample, a desired ink is prepared by mixing several kinds of standard-color ink. Namely, it is necessary to attain a color matching.
Heretofore, this color matching has been done by repeating the preparation of comparison ink samples by knifing using ink mixtures and visually comparing the knifed ink samples with the color samples.
Recently, however, a method of color matching has been more and more adopted in which a small motor-driven printing testing apparatus is used to do a trial printing at a predetermined speed to prepare a comparison sample, and the sample thus made is measured by optically and electrically measuring means and the measured values thus obtained are processed by a computer to judge whether or not the color of the prepared ink matches the color sample.
Heretofore, some printing testing apparatuses have been proposed for the above-mentioned purpose, and one of them is disclosed in the Unexamined Japanese Patent Publication (Kokai) No. 60-189446. This proposed small printing testing apparatus uses a pulse or stepping motor to roll the impression cylinder on the flat intaglio while controlling the speed of the impression cylinder. A printing testing apparatus using a reversible motor is also known.
However, such a small printing testing apparatus is required to have a function to attain a considerably high speed of a movement over a short distance in a short time, for example, a speed of 100 m/min and then stop the movement. In case a flat intaglio is used in the apparatus, the impression cylinder or intaglio has to be moved horizontally. Therefore, means for driving the impression cylinder or intaglio and its associated elements must be sufficiently strong and durable. With the conventional printing testing apparatus using a motor, however, it is difficult to maintain the durability, and so it is hard to reproduce a good print quality for a long time.
Also in the conventional printing testing apparatus, the printing pressure of the impression cylinder and the pressure of the doctor blade are adjusted by means of adjusting screws, respectively. So after replacement of the intaglio, impression cylinder and the doctor blade, it is difficult to meet the same requirements which have been met before that replacement, and it is not possible to provide a test printing or proofing of a high reproducibility and precision.
DISCLOSURE OF INVENTION
The present invention has an object to overcome the above-mentioned drawbacks of the conventional techniques by providing a printing testing apparatus capable of moving the intaglio mount and head (impression cylinder) at a desired speed at any time, that is, capable of always providing for a desired printing speed; incurring neither failure of the drive nor deterioration of accuracy even if used repeatedly for a long period; usable by a method for printing test which ensures always an appropriate printing pressure and contact pressure of doctor blade and in a stable state for a long period; having an excellent reproducibility; easy to maintain and care; and not expensive.
The aforementioned problems are solved by adjusting the movement and moving speed of the intaglio mount or head (impression cylinder) by a pneumatic cylinder connected to a compressor and a pressure adjusting means, and applying and adjusting the printing pressure of the impression cylinder and the contact pressure of the doctor blade by a pressure cylinder, such as a pneumatic or hydraulic cylinder, and a pressure adjusting means.
The moving speed of the piston within the pneumatic cylinder for moving the intaglio mount or head is in proportion to a magnitude per
REFERENCES:
patent: 4558643 (1985-12-01), Arima et al.
patent: 4706565 (1987-11-01), Martin
Arakawa Haruhito
Nakatsuka Takeshi
Takahashi Toru
Toda Yukio
Dainippon Ink and Chemicals Inc.
Fisher J. Reed
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