Sheet feeder
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United States of America Patent
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May 15, 2012
Grant Date -
Oct 1, 2009
app pub date -
Jun 9, 2009
filing date -
Aug 29, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
The invention concerns an apparatus for transferring sheet-like objects from a stack, said apparatus including separate lifting elements gripping by suction to the upper surface of the sheet-like object to be transferred, positioned in a row extending over the stack of the sheet-like objects, and transfer elements for transferring the lifted sheet-like object. The suction effect of the lifting elements is controlled by means of a control device including a light source making a substantially line-shaped illumination pattern. The illumination of the light source is focused at an inclined angle to the surface of the sheet stack, substantially parallel to the lifting element row. A camera means for observing the illumination pattern forwards information about the uniformity of the uppermost layer of the stack.
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