Chart recording apparatus

Details Chart recording apparatus Chart recording apparatus

1981-08-17

1982-09-07

Hartary, Joseph W.

Recorders

Follow-up

346 44, 346139R, G01D 1116

Patent

active

043486835

ABSTRACT:
Chart recording apparatus for use with industrial instrumentation systems and the like, and comprising memory means to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a pen, through the use of an actuator motor controlled by the input signal and a position feedback signal. A friction device is coupled to the pen to hold it in any given position, thereby to serve as a memory for the input signal level. The friction device comprises a thin vane-like element which is secured to the movable member and disposed in the air-gap of a permanent magnet. The air-gap also includes a mass of tiny magnetizable particles which, under the influence of the magnetic field, engage the surfaces of the vane-like element to develop a frictional restraining force. This frictional restraint has the characteristic of being relatively low upon initial movement away from a start point, and thereafter increasing progressively to a plateau level, thereby providing superior dynamic performance particularly in a servo positioning system. A plurality of such controllers can be operated in a time-shared mode, with the memory device of each non-activated recorder holding its pen fixed in position to prevent drift.

REFERENCES:
patent: 2331205 (1943-10-01), Lenehan
patent: 2603103 (1952-07-01), Soho
patent: 2622707 (1952-12-01), Faus
patent: 2792565 (1957-05-01), Popowsky
patent: 3538469 (1970-11-01), Litte

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