Multi-trace chart recorder

Details Multi-trace chart recorder Multi-trace chart recorder

1991-11-05

1994-03-01

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 46, 346 49, 3461351, G01D 900

Patent

active

052912167

ABSTRACT:
A simple chart recorder is described of the type which includes a strip of pressure-markable chart paper, which includes two pressure marking styluses that create traces that can be readily distinguished from one another. Each stylus has a horizontal inner portion (80, FIG. 2 ) that extends largely parallel to chart paper movement and a vertical outer portion (88), with the first stylus having an inner portion lying above the second stylus and having an outer portion lying further downpath than the second stylus. One of the styluses includes a blue pencil lead (92) whose point creates a pressure-marked trace part (116, FIG. 3 ) as well as blue lines (120, 122) on opposite sides of the trace part. Another stylus includes a wheel (180, FIG. 6) with a plurality of points spaced about its periphery to produce a multipoint trace (172). Another stylus includes two closely-spaced tips (200, 202, FIG. 7 ) that form a doubleline trace (208). Another stylus has a tip with a large radius of curvature (R1, FIG. 9 ) to form an unusually wide pressure-marked trace (250). A jiggle device (234, FIG. 8 ) can be coupled to one of the stylus moving mechanisms to produce a trace with jiggles (221). Another stylus includes a lift mechanism (142, FIG. 4 ) which repeatedly lifts the stylus to produce a dashed trace (144).

REFERENCES:
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Streifler, Coast and Geodetic Survey, Photogrammetric Engineering, vol. 3, No. 2, Apr. 1957, pp. 330-334.

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