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This article relates to feeding paper sheets one at a time from a stack of sheets by acting upon the top surface of the stack with a wave generator or "shingler" to fan out the top sheets of the stack.
English (United States)
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Wave Generator Paper Separation System
This article relates to feeding paper sheets one at a time from a stack of
sheets by acting upon the top surface of the stack with a wave generator or
"shingler" to fan out the top sheets of the stack.
The figure shows a shingler wheel 1 rotating in direction A to fan out the top
sheets 2, 3, 4, and 5 from stack 6. As the sheets are fanned out, they climb
ramps 11 and 12 until the sheet 2 has reached the top, whereupon a sensor (not
shown) activates nip roller arm 8 to move, as shown, from the dashed line
position to the solid line position. Such movement brings roller 9 into engagement
with feed roller 10, thus clutching sheet 2 and driving it forward out of the area
containing stack 6.
Simultaneously with the movement of arm 8 to the solid line position, shingler
wheel 1 is lifted from contact with stack 6 so that continued fan out is stopped.
Once sheet 2 has cleared the sensor, arm 8 is dropped to the dashed line
position, and shingler wheel 1 is dropped to contact sheet 3, now the top sheet
on stack 6.
Note that arm 8 moves through a slot (not shown) in ramp portion 12 to the
solid line position. In that manner, the restraint teeth in the arm 8 are positioned
to engage the leading edges of sheets 3, 4, and 5. This acts to prevent any of
these sheets from being pulled into the nip of rollers 9 and 10 when sheet 2 is
pulled from stack 6. Thus, multiple-sheet feed is prevented.