Printing – Processes
Reexamination Certificate
1999-08-30
2001-08-21
Asher, Kimberly L. (Department: 2854)
Printing
Processes
C101S350100, C101S367000
Reexamination Certificate
active
06276275
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for determining the presence of roll of ink in a pressureless ink fountain of a rotary printing press, as well as to several associated devices.
DESCRIPTION OF THE PRIOR ART
A device for inking a screen roller is known from EP 0 663 293 A1, wherein ink rotates around a longitudinal axis parallel with the screen roller in a filled ink chamber of circular cross section.
A negatively pitched working doctor blade and a positively pitched finishing doctor blade are provided.
U.S. Pat. No. 2,399,688 describes a device for maintaining the filling level in an ink fountain constant.
GB 2 299 546 shows a device for placing ink into an ink fountain, which can displaced in the longitudinal direction on a carriage. Sensors for monitoring the fill level of the ink in the ink fountain are fastened on the carriages.
SUMMARY OF THE INVENTION
The object of the present invention is based on providing a method as well as a device, by means of which it can be determined whether build-up of ink forming a roll of ink is formed in an ink fountain in the course of the running of the press.
In accordance with the invention, this object is attained by measuring ink thickness values, the thickness of a rotating built-up roll of ink or the partial hydrostatic pressure exerted on a side wall of an ink fountain. The measured values are evaluated and are used to determine the presence of a built-up roll of ink and its size.
The advantages which can be achieved by means of the invention consist, in particular, in that the thickness of the built-up roll of ink being formed in the course of the running of the press is determined continuously or at intervals, and that an electrical, optical and/or acoustic signal is issued in case of a deviation from a nominal value. In accordance with the value and the direction of the deviation, either a signal for controlling the ink delivery device or a warning signal for the operator is issued.
REFERENCES:
patent: 2399688 (1946-05-01), Metzner et al.
patent: 3631800 (1972-01-01), Mignore et al.
patent: 3730089 (1973-05-01), McCutcheon
patent: 4385558 (1983-05-01), Takahashi et al.
patent: 5560294 (1996-10-01), Anders et al.
patent: 19 38 525 A (1970-02-01), None
patent: 0 663 293 (1995-07-01), None
patent: 2 299 546 A (1989-10-01), None
patent: 55055869 (1983-05-01), None
patent: 62116151 (1987-05-01), None
patent: 62244640 (1987-10-01), None
patent: 6186072 (1994-07-01), None
Patent Abstract of Japan, vol. 13, No. 146 (p-854), Apr. 11, 1989, & JP 63 309805 A (Sumitomo Heavy Ind. LTD), Dec. 16, 1988.
Asher Kimberly L.
Jones, Tullar & Cooper
Koenig & Bauer Aktiengesellschaft
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