Rectilinear pen movement apparatus for recording galvanic skin r

Details Rectilinear pen movement apparatus for recording galvanic skin r Rectilinear pen movement apparatus for recording galvanic skin r

1982-07-22

1984-06-05

Miller, Jr., George H.

Recorders

Writers

Receiver and marker movable

346139R, G01D 1516, G01D 1524

Patent

active

044531680

ABSTRACT:
A rectilinear pen movement apparatus is provided which is responsive to an electrical signal representing a measurement of galvanic skin resistance in order to provide a record of galvanic skin resistance on a chart recording medium. There is provided a support frame and a drive motor mounted to the frame. The drive motor has an output means which rotates on a first axis in response to an input signal representing an electrical measurement of galvanic skin resistance. An input shaft connected to a potentiometer senses the rotation of the output means and provides negative feedback. The input shaft also serves as a step up movement for rotating a swing disc on a second axis parallel to the first axis. A recording pen is supported for rotation about the second axis by a support shaft which is rigidly attached to the swing disc. The support shaft rotates on a third axis parallel to the first and second axis so that the tip of the recording pen moves rectilinearly in response to rotation of the output means. The negative feedback from the potentiometer is used to modify the input signal thereby minimizing hysteresis and friction effects while improving linearity of the travel at the tip of the recording pen.

REFERENCES:
patent: 3188651 (1963-02-01), Offner
patent: 3206756 (1965-09-01), Thayer et al.
patent: 3317915 (1964-11-01), Thompson
patent: 4115734 (1978-09-01), Zoltan

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