Method for controlling the position of a web moving along a given path and apparatus for use in such method
AssigneeFuji Photo Film Co., Ltd.
InventorsYoshiyuki Ishii, Shigehisa Shimizu
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Abstract
A method for controlling the position of a web moving along a given path, which is effective especially when a web travelling speed varies. In the method, the web travelling speed is detected and then a correction speed for correcting the meandering of the web is varied in accordance with the web travelling speed detected, so that the meandering of the web can be corrected with a constant accuracy independent of the variations of the web travelling speed.
Claims4
A method for detecting the position of the edge of a continuously moving web so as to control the position of said web in accordance with said detected edge position when said web is wound or unwound, in which a travelling speed is detected and then a speed for controlling the position of said web is varied in accordance with said detected travelling speed so that the meandering of said web can be corrected properly irrespective of said web travelling speed.
An apparatus for controlling the position of a web moving along a given path, comprising:
- an edge position detector for detecting the position of the edge of said web;
- correction means for correcting the meandering of said web occurring when said web is wound or unwound in accordance with the detection output of said edge position detector;
- a speed detector for detecting the travelling speed of said web when said web is wound or unwound;
- and,
- control means for controlling a correction speed for correcting the meandering of said web by means of said correction means in accordance with said detection output of said speed detector such that, as said travelling speed is accelerated, said correction speed can also be accelerated accordingly.
Dependencies are inferred from the claim text.