Printing – Press part or attachment
Reexamination Certificate
1999-10-27
2001-06-12
Colilla, Daniel J. (Department: 2854)
Printing
Press part or attachment
C101S494000
Reexamination Certificate
active
06244182
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a color press, and more specifically to an anti-expansion web-transfer mechanism mounted between two printing units in a color press to transfer the web from one printing unit to a next printing unit, and to prevent the printed web from expanding in width.
When processing a color printing in a color press, the web is printed color by color through different printing units in the press. When printed through one printing unit, the web may expand in width due to absorption of ink and water. As illustrated in
FIG. 1
, if the width of the web expands from set width D to expanded with D', the web becomes unable to be accurately moved over the printing plate at the next printing unit. When this condition occurs, the printing plate at each printing unit must be respectively adjusted to fit the expanded web. However, it is complicated to adjust the position of the printing plate at each printing unit.
SUMMARY OF THE INVENTION
It is the main object of the present invention to provide an anti-expansion web transfer mechanism for a color press, which prevents the printed web from expanding in width. According to one aspect of the present invention, the anti-expansion web-transfer mechanism comprises a fixed axle and a rotary axle arranged in parallel between two brackets, a plurality of roller supports respectively mounted on the two axles in stagger to hold a respective roller, a transmission mechanism controlled to rotate the rotary axle, enabling the rollers at the roller supports at the rotary axle to be pressed on the printed web against the rollers at the roller supports at the fixed axle, and an air cylinder connected between the transmission mechanism and one roller support at the rotary axle. According to another aspect of the present invention, the transmission mechanism comprises a mounting block pivoted to one bracket, a nut mounted in the mounting block, a driven gear fixedly mounted on the nut outside the mounting block, a screw rod threaded into the nut, the screw rod having a coupling portion extended from one end thereof and coupled to one roller support at the rotary axle through the air cylinder, a stop block fixedly mounted on the coupling portion of the screw rod and stopped at one side of the bracket to which the mounting block is connected, a motor mount fastened to the mounting block at a bottom side, a reversible motor mounted on the motor mount, and a driving gear meshed with the driven gear and driven by the reversible motor to rotate the driven gear.
REFERENCES:
patent: 5598778 (1997-02-01), Iijima et al.
patent: 5678484 (1997-10-01), Callan et al.
patent: 5820122 (1998-10-01), Schneider
patent: 8-156234 (1996-06-01), None
patent: 9-216334 (1997-08-01), None
Lin Chung Hsien
Yu Ting Chen
Colilla Daniel J.
Hueiloo Co., Ltd.
Rosenberg , Klein & Lee
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