Browse Prior Art Database

Metal Surfaced Plastic Foam Core Printer Type Element

IP.com Disclosure Number: IPCOM000085195D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Bixby, PD: AUTHOR [+3]

Abstract

In many printers it is important that the type element have a low moment of inertia so that it can be driven by a relatively small motor. It is also important that the surface of the type element be hard so that it will not be damaged by impact. Furthermore, in printers with a continuously rotating print element, it is not possible to use a pure plastic type element because of the short life of such a part.

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Metal Surfaced Plastic Foam Core Printer Type Element

In many printers it is important that the type element have a low moment of inertia so that it can be driven by a relatively small motor. It is also important that the surface of the type element be hard so that it will not be damaged by impact. Furthermore, in printers with a continuously rotating print element, it is not possible to use a pure plastic type element because of the short life of such a part.

Shown in Figs. 1 and 2 is a mold for making a foam core print element. The mold includes two end plates 10 and a cylindrical mold 11. A center shaft 15, which is part of the print element is inserted through the center of the mold.

In the embodiment shown in Fig. 1, a metal liner 18 (which has the desired print characters produced thereon) is inserted in the cylindrical mold. Next, a foam material, such as semirigid urethane or epoxy is mixed and poured into the cavity. This plastic material solidifies to core 20. The foam core adheres to the metal liner 18. When the end plates 10 and cylindrical mold 11 are removed, the result is a printing element having a foam core 10 and an outside metal liner 18.

If it is preferred to have a thermoplastic material on the outside of the print element, the mold configuration shown in Fig. 2 is used. In this case, the metal liner 18 has a reverse image of the desired characters thereon. A thermoplastic liner 25 is inserted next to the metal liner 18 prior to the foam inse...