Control for a sheet stack supporting platform
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United States of America Patent
Stats
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Sep 30, 1996
filing date -
Sep 30, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A sheet feeder having a platform for supporting a stack of sheets, a feed head assembly for feeding sheets seriatim from the top of a sheet supply stack on the platform, a mechanism for moving the platform relative to the feed head assembly, and a device for controlling operation of the platform moving mechanism. The control device for the platform moving mechanism includes a sensor for detecting marginal edges of sheets in the sheet stack on the platform, and producing a signal indicative of sheet edge detection. Additionally, a sensor is provided for detecting the location of the topmost sheet on the sheet stack on the platform, and producing a signal indicative of such top sheet location detection. A signal is set representative of the top of the sheet stack being in proper operative relation to the feed head assembly, this set signal being based on the signal from the top location sensor for the particular location of the top of the stack when the marginal sheet edge detection signal is first produced. Periodically thereafter, a control signal is produced for actuating the sheet stack supporting platform moving mechanism until the signal indicative of detection of the topmost sheet from the top location sensor is substantially equal to the set signal.
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Patent Citation Ranking
- 19 Citation Count
- B65H Class
- 66.51 % this patent is cited more than
- 26 Age