US 4,228,577 A · Method of making rotary type wheels

Abstract

Resilient tongues project from a central hub and carry two or more type members. The hub is rotated to a position in which the tongue carrying the desired type member is in a printing position facing a paper supporting platen. The hub is then shifted along the axis of the selected tongue so that the required type member is in a printing position. A drive motor for rotating the hub is connected to the hub by a universal joint to compensate for the shifting of the hub. The universal joint comprises a biased presser member to eliminate lost motion in the rotational direction. A stopper member is provided so that the bending characteristics of the selected tongue are the same no matter which type member is selected. A hammer drives the type member against the paper to print. The resilient tongues are formed of a thermoplastic resin mixed with glass or carbon fibers and the type members may be formed separately from the tongues, fixed thereto and plated with metal. The hub may be formed in two or more sections, with each section carrying some of the resilient tongues. The tongues are bent in such a manner that all of the type members lie in a common plane. The angles between the type members and the tongues are selected in such a manner that all of the type members strike the paper perpendicular to the platen.

Claims3

Dependent claims

A method of making a rotary type wheel comprising the steps of:

(a) forming an integral molding comprising an annular portion and a plurality of type face members each extending radially inwardly from the radially inner periphery of the annular portion, each type face member comprising a type face and securing means;
(b) plating the integral molding with a metal;
(c) positioning the integral molding in a mold;
(d) molding in the mold a hub and radially outwardly directed tongues corresponding in number to the plurality of type members;
(e) said molded tongues being molded about said securing means such that the type members are thereby fixedly secured to each tongue;
and
(f) disconnecting the annular portion from the type members.

4 more elements

Dependencies are inferred from the claim text.

Method of making rotary type wheels

Life of this patent

Method of making rotary type wheels

Life of this patent

Abstract

Claims3