Typewriting machines – Including type-set-assemblage mounted on carrier and... – Type-head – per se
Patent
1986-03-18
1987-05-12
Burr, Edgar S.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Type-head, per se
400 53, 400146, 400466, 400166, 101 9303, 101 9313, 101399, B41J 146
Patent
active
046645438
ABSTRACT:
A device for monitoring and compensating for changes in the flight time of the print hammers of impact printers is disclosed. The flight time of the respectively monitored hammer is calculated from the elapsed time between the moment of firing of a hammer and the moment of impact of the print type carrier against the impact platen. In order to ensure automatic self-adjustment of all print hammers in predetermined test cycles, without the actual printing process itself being affected, and without there being any test imprints on the record carrier, the print type carrier includes, in addition to the standard print types, an additional test type. The impact surface area of the test type is large enough such that no visible imprint is made upon its impact on the record carrier because of the low impact pressure.
REFERENCES:
patent: 3513774 (1970-05-01), Pawletko
patent: 3835771 (1974-09-01), Funk et al.
patent: 3872788 (1975-03-01), Palumbo
patent: 4173927 (1979-11-01), Van Kempen et al.
patent: 4347786 (1982-09-01), Sweat, Jr. et al.
patent: 4425844 (1984-01-01), Carrington
IBM Technical Disclosure Bulletin, "Print Hammer Flight Time Control", by Hsieh et al., vol. 24, No. 9, p. 4707, 2-82.
Bohg Armin
Matthaei Horst D.
Zimmermann Volker
Burr Edgar S.
Gasper J.
International Business Machines - Corporation
Jancin, Jr. J.
Wiecking David A.
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