Sensing switch for detecting a document

Details Sensing switch for detecting a document Sensing switch for detecting a document

1979-08-27

1982-05-04

Truhe, J. V.

Electricity: circuit makers and breakers

Special application

Stationary feeler detects transient object

200 6142, 335205, H01H 316

Patent

active

043284027

ABSTRACT:
A document switch senses the movement of a plurality of cards, or the like, as they pass through a path of travel. A pivotable assembly has first and second pivoted arm members including a sensing arm mounted on a pivotable element. In its initial position, the sensing arm projects into the path of card travel. When the card appears, the sensing arm is moved out of its initial position, and a contact mounted on the assembly opens to sense an engagement of the arm with a card. Continued travel of the card moves the arm against a stop which withdraws it from the path of travel and resilient means brings the sensing arm into engagement with the underside of the card. A leaf spring presses against the card to retain it in a guide plane as it travels away from the sensing arm and into the nip of take-up rollers.

REFERENCES:
patent: 2475307 (1949-07-01), Bravel et al.
patent: 3202779 (1965-08-01), Call
patent: 3246526 (1966-04-01), Dollheimer et al.
patent: 3461255 (1969-08-01), Call
patent: 3684845 (1972-08-01), Palmer
patent: 3912890 (1975-10-01), Call

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