Typewriting machines – Including adjustment for optimum printing plane
Patent
1998-02-16
2000-02-22
Bennett, Christopher A.
Typewriting machines
Including adjustment for optimum printing plane
400 56, 400 59, 400 58, 347 37, B41J 25308
Patent
active
060272643
ABSTRACT:
Both a printing-medium support (such as a platen) and a printhead-carriage slide-rod are supported and located in common from a single chassis. Preferably a pair of positive stops is used to locate the slide-rod, and a biasing retainer forcibly abuts the rod against, selectively, either stop of the pair of positive stops. Alternatively the two positive stops are instead used to locate the print-medium support--or separate pairs of such stops are used to locate both the slide-rod and the print-medium support respectively. A respective biasing retainer forcibly engages each located support element against one or the other of its stops. In another facet of the invention, an accurate system establishes and adjustably controls printhead-to-print-medium spacing without an assembly fixture. An adjustable mechanism (such as the biasing retainer mentioned above), distinct from both support elements, locates one of the two supports relative to the other. The mechanism includes components that enable adjustment to control the spacing between the printhead and the printing medium--but these adjustment-enabling components contribute zero uncertainty to the spacing. The assembly method includes positioning the slide-rod with its two ends in respective oversize mounting holes of a chassis, and attaching to each end of the slide-rod a respective retainer to force the slide-rod end in one of exactly two opposite directions against the mounting-hole edge.
REFERENCES:
patent: 4773773 (1988-09-01), Itoh
patent: 4906115 (1990-03-01), Bischof
patent: 5000590 (1991-03-01), Einem
patent: 5678936 (1997-10-01), Hino
patent: 5692842 (1997-12-01), Sasai et al.
patent: 5700095 (1997-12-01), Sugiyama
Caputo Dan Scott
Maher Edward P.
Wilcox Darren W.
Bennett Christopher A.
Hewlett--Packard Company
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