Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-05-26
1994-02-22
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250340, 340675, G08B 2100, G01N 3334
Patent
active
052890074
ABSTRACT:
A sheet break detector apparatus is disclosed for detecting a break in a sheet disposed contiguously between an upstream and a downstream felt of a paper machine dryer section. The detector apparatus includes an infrared light emitter disposed adjacent to the sheet disposed between the felts for emitting a beam of infrared light towards the sheet moving contiguously between the felts. An infrared light receiver is disposed on an opposite side of the felts relative to the emitter for receiving the beam in the absence of the sheet, the beam being blocked by the presence of the sheet while the felts permit the passage therethrough of the beam. A transmitter is connected to the receiver for transmitting a signal from the receiver in the absence of the sheet. An alarm is connected to the transmitter such that in the event of sheet break, the beam of light is received by the receiver and the signal is transmitted to the alarm so that an alarm signal is generated, indicating that a sheet break has occurred.
REFERENCES:
patent: 3906232 (1975-09-01), Meihofer
patent: 4239562 (1980-12-01), McLean
patent: 5019710 (1991-05-01), Wennerberg et al.
Archer David J.
Beloit Technologies Inc.
Campbell Raymond W.
Hannaher Constantine
Veneman Dirk J.
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