Printing – Rolling contact machines – Rotary
Patent
1991-04-17
1992-09-01
Burr, Edgar S.
Printing
Rolling contact machines
Rotary
101192, 101247, 101234, B41F 1324
Patent
active
051429802
ABSTRACT:
The pneumatic controller for detecting the presence or absence of sheets fed through a press machine includes a suction system having a suction duct in a sheet feed cylinder of the press machine and a vacuum pump connected to the suction duct, the suction duct opening onto a surface of the sheet feed cylinder on which one of the sheets contacts at least partially obstructing an air flow through the suction duct during normal press operation. To rapidly detect a sudden increase in the air flow through the suction duct caused by a missing sheet, the pneumatic controller is provided with a flow sensor (1) in the suction duct having a hot wire (16) and a surrounding protective jacket (15), and an analyzing circuit (2) connected to the flow sensor. The analyzing circuit (2) detects the temporary cooling of the hot wire (16) caused by the increase in the air flow rate and the analyzing circuit (2) detects the change of resistance of the wire and generates and amplified voltage output signal.
REFERENCES:
patent: 2926684 (1960-03-01), Replogle
patent: 3425277 (1969-02-01), Adams
patent: 4246775 (1981-01-01), Stultz
patent: 4515014 (1985-05-01), Sumal
patent: 4648270 (1987-03-01), Johnson et al.
patent: 4916948 (1990-04-01), Inada et al.
Bottger Johannes
Buschmann Falk
Burr Edgar S.
KBA-Planeta AG
Nguyen Anthony
Striker Michael J.
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