Web advancement sensing methods and apparatus
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United States of America Patent
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Jun 26, 1984
Grant Date -
N/A
app pub date -
Sep 16, 1981
filing date -
Sep 16, 1981
priority date (Note) -
Expired
status (Latency Note)
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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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