Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1993-03-05
1995-09-26
Wiecking, David A.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
4001572, B41J 950
Patent
active
054529581
ABSTRACT:
The invention provides an drive coil protection apparatus and method and a printer incorporating the apparatus. A rank memory stores a preset rank value associated with a reference drive coil in the print head of a printer. The preset rank value characterizes inherent deviations associated with the reference drive coil. The deviations result from manufacturing process, etc. A judgment value memory stores a plurality of sets of mode judgment values. Each set of mode judgment values corresponds to a particular rank value. Each mode judgment value represents a threshold value for determining the thermal condition of the print head and for selecting an appropriate operating mode for the print head. A head information detector detects the voltage drop across the reference drive coil to measure the change in the resistance of the reference drive coil. The voltage drop is digitized for accuracy measurement. The change in temperature of the reference drive coil can thus be determined. An operating mode selection circuit compares the digitized voltage drop with a particular set of mode judgment values in the judgment value memory corresponding to the preset rank value. Then, the operating mode selection circuit selects a suitable operating mode for the print head in accordance with the comparison. Thus, burnout of the print head can be prevented without reducing the operating efficiency of the printer.
REFERENCES:
patent: 4540295 (1985-09-01), Okunishi
patent: 5042375 (1991-08-01), Gruner et al.
patent: 5054941 (1991-10-01), Koike et al.
patent: 5152619 (1992-10-01), Niikawa et al.
Aruga Kazuhisa
Fukuda Yoshiaki
Ito Yoshikazu
Kelley Steven S.
Tsiang Harold T.
Wiecking David A.
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