Material processing machine

Details Material processing machine Material processing machine

2005-02-08

2005-02-08

Dinkins, Anthony (Department: 2831)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

C361S160000, C361S186000

Reexamination Certificate

active

06853531

ABSTRACT:
A material processing machine such as a wood chipping machine, a press, or other machine comprising an operating region having at least one processing element, and an access region through which material passes to the operating region, has at least one passive sensor that may be worn by a user of the machine, for example, around their wrist, and at least one sensing coil mounted in the access region of the machine for detecting the presence of the passive sensor in the access region. Control circuitry responsive to the at least one sensing coil provides control signals for stopping operation of the machine, preventing start-up of the machine and/or otherwise preventing injury to the machine user.

REFERENCES:
patent: 2913581 (1959-11-01), Simonton et al.
patent: 3989198 (1976-11-01), Blasko
patent: 4057805 (1977-11-01), Dowling
patent: 5227798 (1993-07-01), Hildebrand
patent: 5287113 (1994-02-01), Meier
patent: 5667152 (1997-09-01), Mooring
patent: 5669809 (1997-09-01), Townsend
patent: 6000642 (1999-12-01), Morey

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