Safety device for a printing machine

Details Safety device for a printing machine Safety device for a printing machine

1995-05-31

1996-11-12

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340522, 340507, 340540, 318103, 192129A, 49 31, G08B 2100

Patent

active

055744370

ABSTRACT:
This invention describes a monitoring device which monitors the safety of a printing machine. The printing machine has a drive, a control unit arranged upstream of the drive, command buttons which are connected to the control unit and via which the start-up of the printing machine can be initiated, as well as sound generators, connected to the control unit, for the emission of an acoustic alarm signal after the actuation of one of the command buttons initiating the start-up. The monitoring device ensures that a start-up of the printing machine is only carried out if an acoustic alarm signal has previously been properly emitted. This is achieved, according to the invention, by the monitoring device registering the emission of the acoustic alarm signal and, in the event of the alarm signal not being emitted, inhibits the drive of the printing machine from starting up. The monitoring device inhibits the drive via the control unit, disabling the main contactor connected to the drive, applying the brake or switching off the field current via a field contactor.

REFERENCES:
patent: 4266221 (1981-05-01), Hawkins
patent: 4821024 (1989-04-01), Bayha
patent: 5165107 (1992-11-01), Hand et al.
patent: 5189388 (1993-02-01), Mosley et al.
patent: 5264834 (1993-11-01), Silken et al.
CEIG-Berichte, Juli/Sep. 1957, pp. 179-185, "Meldeeinrightungen fur Schaltwaren", von Herbert Schmitz, Voight & Haeffner AG.

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