Browse Prior Art Database

LIGHT WEIGHT TYPEWRITER PLATEN DESIGN

IP.com Disclosure Number: IPCOM000026709D
Original Publication Date: 1993-Apr-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 59K

Publishing Venue

Xerox Disclosure Journal

Abstract

Platen rolls used in typewriters and printers are typically made by machining a steel core from a bar of steel and then molding rubber around it, which is eventually ground to a proper diameter. Rolls fabricated by this method are expensive to produce, heavy and require a lot of machining. The use of structural foam plastics has been considered as an alternative. They too, are cost prohibitive due to a long processing cycle for cylindrical parts when said parts are greater than three-quarters of an inch in diameter.

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XEROX DISCLOSURE JOURNAL

LIGHT WEIGHT TYPEWRITER Proposed Classification PLATEN DESIGN U.S. C1.400/112 Robert D. Russell Int. C1. B41j 19/16

Platen rolls used in typewriters and printers are typically made by machining a steel core from a bar of steel and then molding rubber around it, which is eventually ground to a proper diameter. Rolls fabricated by this method are expensive to produce, heavy and require a lot of machining. The use of structural foam plastics has been considered as an alternative. They too, are cost prohibitive due to a long processing cycle for cylindrical parts when said parts are greater than three-quarters of an inch in diameter.

Proposed is an application for using a new process in the plastic molding field to produce a core that is very strong, yet light weight due to its hollow structure. The process has been used to form doors and panels for business equipment. More recently, it has also been used to produce some frames in the automative field.

A gas assisted injection molding process is used to introduce nitrogen or inert gas into a molten resin during the molding cycle to obtain hollow parts. This disclosure uses liquid crystal polymer resins made using this process as the core for subsequent manufacturing processes to obtain a final typewriter or printer platen roll.

XEROX DISCLOSURE JOURNAL - Vol. 18, No. 2 MarcWAprill993 225

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