Method of making coinjection molded daisywheel printhead

Details Method of making coinjection molded daisywheel printhead Method of making coinjection molded daisywheel printhead

1987-07-27

1989-06-27

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

264156, 264255, 400174, 425130, B29C 4516

Patent

active

048427950

ABSTRACT:
A printhead is formed by injecting unfilled nylon by injection unit 1 and mineral filled nylon by injection unit 3. The filling adds impact resistance for printing, while the unfilled nylon is particularly resistant to flexural fatigue near the hub of the printwheel. Unit 1 is operated first to form an outer layer, with quantity limited so that the outer layer comes to about the middle of the arms of printheads. Unit 3 is then operated to form a core and to be the only material forming the character elements. The resulting printhead is durable and is capable of use at greater deflection than the same printhead made of only the impact resistant material.

REFERENCES:
patent: 3935937 (1976-02-01), Tramposch
patent: 4018639 (1977-04-01), Staples Jr.
patent: 4165189 (1979-08-01), Bauer
patent: 4391537 (1983-07-01), Prest Jr. et al.
patent: 4609516 (1986-09-01), Krishnakomar et al.
patent: 4715802 (1987-12-01), Arai

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