Portable compact strip chart recorder with lost-motion protectiv

Details Portable compact strip chart recorder with lost-motion protectiv Portable compact strip chart recorder with lost-motion protectiv

1978-12-08

1980-04-22

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

Stylus feature

G01D 1516

Patent

active

041997689

ABSTRACT:
A portable strip chart recorder is provided with a constant speed strip chart advancing drive powered from a clockworks and gear drive unit. The gear drive unit is sealed from the strip chart so that it cannot be tampered with when the strip chart is changed. The constant speed drive comprises a constant speed sprocket spool which engages sprocket holes in a strip chart running between a feed spool and a take-up spool. The feed spool is provided with a drag to allow variations in the rotational speed of the strip chart on the spool and provide tension on the chart whereas the take-up spool is provided with a slip clutch that allows the chart to be wrapped at a constant tangential speed even though the diameter of the chart on the take-up spool varies.

REFERENCES:
patent: 2693993 (1954-11-01), Dickson
patent: 2717192 (1955-09-01), Chappell
patent: 2749204 (1956-06-01), Stanfield
patent: 3104930 (1963-09-01), Schezger
patent: 3355742 (1967-11-01), Staubli
patent: 4015270 (1977-03-01), Barnes, Jr. et al.

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