Time independent logic system for rip detectors

Details Time independent logic system for rip detectors Time independent logic system for rip detectors

1982-12-29

1984-08-07

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

198502, 198856, G08B 2100

Patent

active

044646542

ABSTRACT:
A rip detector system accurately monitors the integrity of a conveyor belt or the like substantially as a function of signals that establish a variable time frame determined according to belt speed and a further signal representing integrity. The belt includes rip sensors or antennas, for example embedded therein. Three detectors at related spaced apart locations relative to the conveyor belt system monitor the integrity of the antennas as an indication of the integrity of the belt. Two of the detectors are located upstream, i.e. relative to the belt travel direction, of a location frequently prone to encountering rips to produce information indicating both that an integral antenna has been detected and the effective speed of the belt, i.e. a speed relative time frame in which presence of that antenna at the third detector can be expected. The third detector is located downstream of the rip-prone location of the conveyor belt system.

REFERENCES:
patent: 3792459 (1974-02-01), Snyder
patent: 3922661 (1975-11-01), Enabnit et al.
patent: 4106005 (1978-08-01), Asakawa
patent: 4228513 (1980-10-01), Doljack

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