Printing machine with continuous sheet feed mechanism
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United States of America Patent
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Apr 14, 1992
Grant Date -
N/A
app pub date -
Oct 24, 1990
filing date -
Oct 24, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved printing machine for moving paper sheets from a paper stack along an endless belt to an impression cylinder with continual movement of the paper sheet without stopping and starting. The instantaneous angular position of the impression cylinder is sensed and the instantaneous position of the paper along the endless belt is sensed and an error signal is generated if the relative positions are such that the paper will not arrive at the impression cylinder clamp at the proper time. The error signal causes the vacuum to be applied to a vacuum paper sheet pickup to be turned on and off at varying times to vary the time of pickup of each paper sheet that is deposited on the endless belt, thus controlling the position of each sheet on the belt. The invention allows large increases in printing speeds over the prior art because the sheets of paper are moved between the paper stack and the impression cylinder in a nonstop manner.
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