Printing – Rolling contact machines – Rotary
Reexamination Certificate
2003-08-18
2004-11-23
Yan, Ren (Department: 2854)
Printing
Rolling contact machines
Rotary
C101SDIG029
Reexamination Certificate
active
06820549
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a rotary press for printing on a web and, more particularly, to a rotary press in which a slack or excessive tension of the web which occurs between a winding roll and printing unit during plate replacing can be removed.
A rotary press of this type is disclosed in Japanese Patent Laid-Open No. 2001-315296. In the rotary press disclosed in this reference, a web press is provided in a web traveling path between a feeder and a printing unit, and a dancer roller serving as a wrap-up preventive member is provided downstream of the web press.
In this arrangement, a slack or excessive tension of the web which occurs in the web traveling path between the feeder and printing unit during plate replacing is removed by the dancer roller. After the plate replacing, when the web is to be fed, the web is pressed by the web press, and feeding from the feed roll is discontinued, so that the slack of the web is removed smoothly.
In the conventional rotary press described above, as the slack or unusual slack of the web is removed by the dancer roller, when web threading is to be performed, it is cumbersome to thread the web through the dancer roller or a guide roller provided before or after the dancer roller, thus interfering with reduction of the work time. Since the dancer roller which is used only for plate replacing must be provided, the entire length of the printing press increases by the dancer roller. Since the web press is needed, the entire length of the printing press increases by the web press.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a rotary press that can perform web threading operation easily.
It is another object of the present invention to provide a rotary press in which the entire length of the machine is shortened.
In order to achieve the above objects, according to the present invention, there is provided a rotary press comprising a printing unit for printing on a web supplied from a winding roll, a folding machine for folding the printed web supplied from the printing unit, a wrap-up preventive member retreating from and advancing to a web traveling path between the printing unit and the folding machine, during printing and plate mounting, respectively, to come into contact with the web, driving means for selectively, rotatably driving the winding roll in a reel-out direction and a winding direction, tension detecting means for detecting a tension of the web between the winding roll and the printing unit, and control means for controlling the driving means on the basis of a detection result of the tension detecting means during plate mounting.
REFERENCES:
patent: 3667664 (1972-06-01), Schroeder
patent: 4201132 (1980-05-01), Zimmer et al.
patent: 4657164 (1987-04-01), Felix
patent: 4722275 (1988-02-01), Taguchi et al.
patent: 5443008 (1995-08-01), Pavliny et al.
patent: 5996492 (1999-12-01), Jurkewitz et al.
patent: 6058844 (2000-05-01), Niemiec
patent: 6295925 (2001-10-01), Sarni et al.
patent: 1153744 (2001-11-01), None
patent: 07-041221 (1995-02-01), None
patent: 11165400 (1999-06-01), None
patent: 2001-315296 (2001-11-01), None
Iyokawa Kazuya
Noguchi Kazushi
Blakely & Sokoloff, Taylor & Zafman
Komori Corporation
Yan Ren
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