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Browse Prior Art Database

Automatic Stacker Level Detection

IP.com Disclosure Number: IPCOM000077011D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Olson, JA: AUTHOR

Abstract

Stacker platform level control apparatus permits removal of documents by an operator at any time without going through a stop and start routine. Control apparatus for automatically lowering the stacker platform a predetermined amount after documents accumulating thereon reach a particular level is included, but only to provide a complete understanding of the control system.

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Automatic Stacker Level Detection

Stacker platform level control apparatus permits removal of documents by an operator at any time without going through a stop and start routine. Control apparatus for automatically lowering the stacker platform a predetermined amount after documents accumulating thereon reach a particular level is included, but only to provide a complete understanding of the control system.

Document 10, Fig. 1, leaves control of belts 15 and 20 at point 16 and travels in free flight until it impacts stacker backplate 26. The leading edge of document 10 engages arcuate section 31 of document tail kicker 30, which functions to deflect the trailing edge of document 10 being stacked out of the way of an incoming document. Shutter plate 32 activates light sensitive detectors 40 and 50, see also Fig. 2, each time tail kicker 30 is potentiated by a document. However, the detectors 40 and 50 are sampled only when 30 is in a static condition, i.e., after a document has settled down, so as to detect the true level of the documents accumulating on platform 27. This is accomplished by document detector 45 positioned upstream in the document path less than the minimum distance between documents. Tail kicker 30 will be in a static condition by the time a document reaches detector 45.

Whenever the documents accumulating on platform 27 reach a level so that detector 40 is activated and detector 45 is activated by a document in the path, AND circuit 71, Fig. 3, passes a signal to fire single-shot multivibrator 72 to provide a signal to AND circuit 60 of a duration to lower the platform a predetermined amount. Suitab...