Web advancement sensing methods and apparatus
First Claim
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1. Apparatus for sensing advancement of a web from a web supply, comprising in combination:
- means including a compliance arm for forming web from the supply into a loop;
means for inhibiting removal of web from the supply into said loop, including a web supply brake having means for resiliently biasing said compliance arm in the sense of a restoration of said loop;
means for pulling web from said loop thereby tightening said loop and moving said compliance arm;
means on said compliance arm for releasing said brake for a restoration of said loop; and
means including a projection of the compliance arm responsive to tightening of said loop for sensing advancement of said web.
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Abstract
Methods and apparatus for sensing advancement of a web from a web supply remove the web from the supply in successive distinct and constant increments. Each constant increment is sensed upon its removal from the supply. Advancement of the web is then determined from the sensed constant increments. The requisite constant increments may be provided by advancing web from the supply and selectively arresting the supply to limit the advanced web to the constant increment for each advance.
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Citations
9 Claims
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1. Apparatus for sensing advancement of a web from a web supply, comprising in combination:
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means including a compliance arm for forming web from the supply into a loop; means for inhibiting removal of web from the supply into said loop, including a web supply brake having means for resiliently biasing said compliance arm in the sense of a restoration of said loop; means for pulling web from said loop thereby tightening said loop and moving said compliance arm; means on said compliance arm for releasing said brake for a restoration of said loop; and means including a projection of the compliance arm responsive to tightening of said loop for sensing advancement of said web. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification