Patent ID: 6752080
Filing Date: 2004-06-22
Classification: B41C,B41J,B65H

Abstract:
A device for holding sheet material in a wound state around a peripheral surface of a rotary drum, the device comprising:a column disposable at a predetermined position on the peripheral surface of the rotary drum; a clamp body pivotable about the column, the clamp body including one end comprising a clamping portion for clamping the sheet material to the peripheral surface of the rotary drum, the clamping portion being movable into at least clamping and released positions; an urging device for urging the clamping portion of the clamp body into the clamping position; and a clamping unit disposably spaced away from the rotary drum and including a linearly movable rod, which the clamping unit moves to contact an end of the rod with the clamp body and counters urging force of the urging device to thereby pivot the clamp body into the released position, wherein a locus of the linear movement of the rod and a position of contact between the clamp body and the rod are such that a straight line (C) and an axial line (D) of the rod intersect at a substantially right angle, the intersection being between a straight line (A) and a straight line (B), the straight line (A) connecting a clamp body pivot point (Y) in the column and a contact point (X) between the end of the rod and the clamp body when the clamping portion is in the clamping position, the straight line (B) connecting the pivot point (Y) and a contact point (Z) between the end of the rod and the clamp body when the clamping portion is in the released position, the straight line (C) passing through the pivot point (Y) and being parallel to a line tangential to the peripheral surface of the rotary drum at a point where a line of shortest distance between the pivot point (Y) and the peripheral surface of the rotary drum intersects with the peripheral surface of the rotary drum.