Patent Number: 6,293,453

Title: Apparatus and method for controlling drag roller

Abstract: An apparatus for and a method of controlling a drag roller in a printing machine to move a web with no shift of a printing position and enhance the printing quality remarkably, even when the drag roller varies in diameter due to its temperature change. From a given temperature-rotational-speed table, a controlling unit obtains a rotational speed of the drag roller so as to adjust a circumferential speed of the drag roller, which speed corresponds to the current circumferential surface temperature checked by a temperature monitor unit. Then, a rotational speed changing unit changes the rotational speed of the drag roller to a value equivalent to the rotational speed obtained by the controlling unit.

Inventors: Hirose; Hitoshi (Hiroshima-ken, JP), Ueda; Yoshio (Hiroshima-ken, JP), Akatsuka; Masakazu (Hiroshima-ken, JP), Tasaka; Norifumi (Hiroshima-ken, JP)

Assignee: Mitsubishi Heavy Industries, Ltd.

International Classification: B41F 13/004 (20060101); B65H 23/188 (20060101); B65H 023/18 (); B65H 026/08 (); B28Q 015/12 ()

Expiration Date: 09/25/2018