Thermal plotter

Details Thermal plotter Thermal plotter

1982-01-29

1983-07-19

Griffin, Donald A.

Recorders

Thermal recording

G01D 1510

Patent

active

043946640

ABSTRACT:
A thermal plotter is provided which is of extremely simple construction and which can provide a magnified trace on a sheet in response to very small mechanical movement. A pair of spaced electrically conductive bus bars are disposed with their forward edges in contact with an electrical resistance wire which is maintained at a small acute angle to the axis of the bus bars. The resistance wire is supported by a mechanism which is moveable about a pivot axis to cause lateral movement of the portion of the resistance wire which bridges the bus bars. Small pivotal movement of the mechanism is magnified by the angular orientation of the resistance wire and bus bars into relatively larger movement along the length of the bus bars. A heat sensitive sheet is disposed with a surface in engagement with the confronting edges of the bus bar and bridging resistance wire, and is arranged for movement along a path transverse to the axis of the bus bars. An electrical potential is applied to the bus bars to cause current flow through the bridging portion of the resistance wire and the heating thereof. The heated wire is operative to cause formation of a visible image on the confronting sheet in a pattern corresponding to movement of the bridging portion.

REFERENCES:
patent: 1820088 (1931-08-01), Parker et al.
patent: 2653126 (1953-09-01), Greig

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