Printing – Inkers – Roller
Patent
1989-08-14
1992-03-31
Crowder, Clifford D.
Printing
Inkers
Roller
291218, 2989532, B41F 3100, B41F 524
Patent
active
050997599
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a printing machine ink roller to be used as an ink receiving roller and an ink metering roller of an ink arrangement for, e.g., a flexographic printing machine, an offset printing machine, and a letterpress printing machine and a method of manufacturing the same.
BACKGROUND ART
In recent years, a keyless offset printing machine, which excludes an apparatus (ink adjusting buttons) for adjusting an ink amount in order to simplify a printing machine, has been increasingly used. This keyless off-set printing machine has main purposes of simplifying a structure of a printing machine, decreasing a manufacturing cost, and allowing an unskilled operator to operate the machine. That is, conventional printing machines have a large number of ink adjusting buttons for adjusting an ink amount in the widthwise direction of an object to be printed. An ink amount required for printing is adjusting by periodically monitoring the object to be printed. The keyless offset printing machine will be described below with reference to FIG. 1.
Referring to FIG. 1, reference numerals 1 denote ink fountains which contain ink 2. Ink fountain rollers 4 are located above the ink fountains 1 to draw up the ink 2 from the ink fountains 1 and form ink films 3 on their surfaces. Metering rollers 5 are located above the ink fountain rollers 4 to receive the ink from the ink fountain rollers 4 and adjust metering. As the metering rollers 5, a roller called an anilox roller manufactured by forming a large number of independent small recesses (cells) for holding ink on the surface of a core metal (not shown) is generally used. A large number of independent pyramidal recesses 2a are formed on the surface of the anilox roller as shown in FIGS. 2(A) and 2(B), or a large number of pyramidal trapezoidal recesses 3a are formed thereon as shown in FIGS. 3(A) and 3(B). Doctor blades 6 made of steel (e.g., Sweden steel) are located in contact with the metering rollers 5 to scrape off excessive ink from the surfaces of the metering rollers 5. Rubber forme rollers 8 are located above the metering rollers 5 to supply the ink from the metering rollers 5 to forme cylinders. Rubber blanket cylinders 12 are located adjacent to the forme rollers 8 via forme cylinders 7 to transfer predetermined printing contents onto an object to be printed 13 such as paper. Dampening water 10 of dampening arrangements 9 is supplied to non-image areas of formes of the forme cylinders 7 via soaking rollers 11.
The surface layer of the metering roller 5 of the above keyless offset printing machine is molded as follows. That is, the surface of a steel roll (mother) having a large number of projections is urged against the surface of a core metal consisting of, e.g., iron, thereby forming the recesses 2a or 3a shown in FIG. 2 or 3, respectively. Chromium plating is then performed on the surface of the core metal. This chromium plating is performed to protect the surface of the core metal from abrasion caused by the doctor blade. The number of recesses 2a or 3a formed on the surface of the metering roller 5 serving as the anilox roller is represented by the number of recesses 2a or 3a arranged in a width of an inch. For example, "300 lines/inch" means that 300 recesses 2a or 3a are arranged in a width of an inch. The depth of each recess 2a or 3a is normally about 25 .mu.m. In place of chromium plating, a ceramic such as tungsten carbite is sometimes flame-sprayed on the surface of the core metal.
Unlike the molding method of the recesses 2a or 3a using the mother, another molding method may be performed such that a ceramic is flame-sprayed on the surface of the core metal and then a laser beam is radiated thereon to form the recesses 2a or 3a on the surface of the core metal.
A roller for serving as the anilox roller of the keyless offset printing machine must satisfy the following conditions.
1 Ink density is not reduced by dampening water, and roller stripping (a phenomenon in which ink cannot be spread on the roller due to dam
REFERENCES:
patent: 2804678 (1957-09-01), Rockoff
patent: 2863175 (1958-12-01), Meyer
patent: 2932859 (1960-04-01), Rockoff
patent: 4882990 (1989-11-01), Ijichi
patent: 4967663 (1990-11-01), Metcalf
Ishibashi Nobuyuki
Sonobe Saburo
Crowder Clifford D.
Kinyosha Co., Ltd.
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