Typewriting machines – Including type-set-assemblage mounted on carrier and... – Type-head – per se
Patent
1986-07-09
1989-05-09
Wiecking, David A.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Type-head, per se
4001442, 400175, B41J 130
Patent
active
048284130
ABSTRACT:
Improved rotary-type printing wheels, components thereof and mechanisms for mounting the printing wheels to a drive are disclosed. The disclosed printing wheels have a reduced rotary moment of inertia. As compared to all plastic printing wheels, they have improved print characteristics and service life while still having a reduced rotary moment of inertia. The printing wheels include a central hub having teeth extending along its periphery which are engaged by a drive. Alignment apparatus is provided for aligning the hub and drive, but rotary torque need only be applied to the printing wheel hub through the peripherally disposed teeth. The spoke elements of the printing wheel are made of metal and can be formed as one piece with the hub or separately. The tips of the spoke elements have a configuration which facilitates and improves attachment of a character element thereto while reducing the rotary moment of inertia of the print wheel. The tips also have an integrally formed surface which mates with and is guided by a correspondingly shaped surface of an impact hammer. A die system is disclosed for forming spoke tips in which removable die inserts are provided so that any spoke tip can have any of several widths. This enables special order print wheels having either proportional or standard spacing to be fabricated relatively quickly and inexpensively. Damping structures are disclosed for restaining unwanted motion of a spoke along the path followed by the spoke during printing and restraining structures are disclosed for resisting torsional motion of the spoke bars. The damping and restraining structures also contribute to reducing the overall rotary moment of inertia of the print wheel.
REFERENCES:
patent: 3707214 (1972-12-01), Ponzano
patent: 3935937 (1976-02-01), Tramposch
patent: 4124930 (1978-11-01), Bauer
patent: 4235664 (1980-11-01), Menke
patent: 4251318 (1981-02-01), Oberg et al.
Creative Associates
Wiecking David A.
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