Thermal printing device with spring support tines

Details Thermal printing device with spring support tines Thermal printing device with spring support tines

1979-09-24

1980-11-04

Miller, Jr., George H.

Recorders

Thermal recording

346136, G01D 1510, G01D 1528

Patent

active

042323258

ABSTRACT:
An improved thermal printing device in which pressure is applied to hold the heat-sensitive paper 5 in contact with a print head 1 by a spring metal comb 8. The comb has a large number of tines (typically 2.5 per millimeter of the comb's width) and can be produced by an etching (or "chemical milling") process. The narrow width of the tines allows very good thermal contact with the print head to be achieved without resort being made to a rubber roller with a high contact pressure. This feature improves uniformity of print and reduces greatly the undesirable effect of the chart paper adhering to the print head through high contact pressure and local heating. The design of the path that the chart paper follows also reduces this undesirable adhering effect. The improved device is very suitable for chart recorders where the paper moves slowly.

REFERENCES:
patent: 3389401 (1968-06-01), Neff
patent: 3512174 (1970-05-01), Schwarzer

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