Typewriting machines – Platen or platen-moving mechanism – Cylindrical platen
Patent
1989-02-21
1991-05-07
Dawson, Robert A.
Typewriting machines
Platen or platen-moving mechanism
Cylindrical platen
400661, 400662, 264 455, 264 467, B41J 1104
Patent
active
050131702
ABSTRACT:
A method of producing platens for typewriters and similar office equipment. Conventional platens often include a large number of individual parts and are relatively expensive because of their high assembly and finishing costs. According to the invention, an impact-resistant polyolefin with the addition of a delayed-reacting foaming agent is employed in an injection molding process in such a fashion that, by means of differential cooling of the mold, the material on the platen surface and in areas of other functional elements such as line-advance wheel
otched wheel combinations hardens, while the core of the platen remains a foam. The process allows platens with other functional elements molded to them to be manufactured from a single material in a single operation and without any additional work, despite different demands made on the print backing and the other functional elements.
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Haftmann Johannes
Schmeykal Rudolf
Dawson Robert A.
Kuhns Allan R.
Ta Triumph Adler Aktiengesellschaft
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