Paper web feed unit used in a rotary press and equipped with a paper web traveling tension controller

A paper web feed unit used in a rotary press in which a paper web taken out of a paper roll passes through the paper web feed unit and a press unit along a paper threading path having guide rollers, the paper web feed unit comprising:

• feed-out means which is rotated by drive means and is adapted to feed to a downstream side the paper web wound around the outer circumferential surface of the feed-out means, by means of frictional force between the outer circumferential surface of the feed-out means and the paper web;
• cutting means for cutting the traveling paper web into first and second cut paper webs having substantially the same width;
• an angle bar section comprising angle bars around which only the first cut paper web is wound, the angle bar having two parallel bars which are disposed with a predetermined distance therebetween such that the bars skew with respect to the driven roller so that the traveling path of the first cut paper web is transferred;
• and a paper web traveling tension controller for controlling the traveling tensions of the first and second cut paper webs in a region downstream of the angle bar section, wherein
• the paper web traveling tension controller comprises:
• dancer roller means including a first rotatable dancer roller around which the first cut paper web passing through the angle bar section is wound, and a second rotatable dancer roller around which the second cut paper web not passing through the angle bar section is wound, the first and second dancer rollers being moved in a synchronized manner by a link mechanism in order to change the lengths of respective traveling paths along which the first and second cut paper webs travel, and a predetermined pushing pressure being applied to each of the first and second dancer rollers in a direction for increasing the length of the traveling path of the corresponding cut paper web;
• detection means for detecting the positions of the first and second dancer rollers;
• and
• control means for receiving a detection signal output from the detection means and for outputting a control signal to the drive means in order to control the rotational frequency of a driven roller of the feed-out means to thereby maintain each of the first and second dancer rollers at a constant position.