Recorders – Thermal recording
Patent
1978-07-03
1980-07-15
Miller, Jr., George H.
Recorders
Thermal recording
346136, 346145, 400120, G01D 1510, G01D 1524, G01D 1500
Patent
active
042131359
ABSTRACT:
A thermal strip chart recorder is provided in which the strip chart is transported at a precise predetermined speed with consistent print darkness. A thermal printing assembly compresses the chart against a cushioned roller with sufficient force to provide dark printing. The printing assembly includes a plurality of printing heads mounted for independent movement in a side-by-side relationship. The roller includes circumferentially spaced sprockets near either end and a central, coaxial, cushioned sleeve which rotates freely with respect to the sprockets. In operation, the roller is driven at a precise rotational speed and moves the strip chart at a precise linear speed by means of the sprockets, which engage sprocket holes in the strip chart. In operation, the strip chart is moved at a precise speed regardless of the printing head pressure, because the freely rotatable sleeve exerts no drag on the strip chart regardless of how much the sleeve is compressed. The recorder also includes a display face plate for printed strip chart which may be released to pivot outward and downward to permit access to the interior of the recorder for replenishing the strip chart material. The display face is also adjustable to tilt backward for more convenient viewing of a printed strip chart.
REFERENCES:
patent: 2718450 (1955-09-01), Leonard et al.
patent: 3066299 (1962-11-01), Kampf
patent: 3154368 (1964-10-01), Daigler et al.
patent: 3370300 (1968-02-01), Gilovich et al.
patent: 3731318 (1973-05-01), Dickey
patent: 4039065 (1977-08-01), Seki et al.
patent: 4130752 (1978-12-01), Conta et al.
patent: 4141019 (1979-02-01), Johnson
American Home Products Corporation
Miller Jr. George H.
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