Method of making the hub of a printing wheel for impact printers and print wheel obtained thereby
US4264222A · kind A · utility
Inventor
Key dates
| Filing date | Jun 22, 1979 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | Jun 22, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/14
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing the molded hub of a print wheel of the type having a central axial passage of precise diameter and a plurality of elastically deformable, concentrically arranged character carrying radial arms. A metal ring carrying radial passageways is centered in the mold cavity used for forming the hub, etc., and a plastics composition is injected into the mold cavity only through the center of the ring and by way of the radial passageways whereby the metal ring becomes a unitary permanent part of the hub and defines the central axial passage. After the molding, the molded structure is released from the mold and the remainent central plastic plug easily is sheared from the ring, as by punching, for example. Remainent plastic material left within the radial passageways functions supplementary to maintain the stability and concentricity of the ring and hub assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.