# US 4,391,536 A · Word processor print wheel assembly

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- Number: US 4,391,536 A
- Document ID: US4391536A
- Status: Granted
- Kind: A
- Application number: 06/298,307
- Filed: 1981-09-01
- Granted: 1983-07-05
- Earliest claimed: 1980-09-02
- Assignees: Franz Buttner AG
- Inventors: Michael Muller; Herbert Scherrer; Erwin Kagi
- Web page: https://patentgrep.com/patent/US4391536A

## CPC

- B41J 1/30: with the types or dies moving relative to the carriers or mounted on flexible carriers
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A print wheel assembly for a word processing machine utilizing a daisy wheel-type printer as a type-carrying disk in which the typefaces are mounted upon flexible members generally extending radially from a hub by which the wheel is mounted in the machine. According to the invention, a pigment carrier overlies the typefaces and can be of disk configuration and is so mounted on the wheel as to shift relative to the typefaces, whereby successive impacts are offset from one another for each typeface. The pigment carrier can be a bibulous or capillary fabric drawing ink from a reservoir dimensioned to supply sufficient ink to feed the transfer layer for the duration of the useful life of the wheel.

## Claims

### Claim 1

A print wheel assembly for a printer of a word processing machine or the like, comprising:
a type disk formed unitarily with a hub and a peripheral array of laterally deflectible typefaces connected to said hub;
an annular color-transfer layer connected to said disk and overlying said typefaces for juxtaposition with a paper onto which images of said typefaces are to be transferred by impact, said transfer layer being provided on a carrier rotatably mounted on said hub and angularly shiftable relative to said disk upon rotation thereof to offset successive points of contact between said typefaces and the layer; and
an annular reservoir on said carrier and rotatably mounted thereby on said disk containing flowable coloring material and connected to said layer for transferring said material to said layer, said reservoir containing a porous material impregnated with said coloring material.

### Claim 2 (depends on 1)

The assembly defined in claim 1 wherein said reservoir is dimensioned to contain at least sufficient coloring material to supply said transfer layer for the average useful life of said disk.

### Claim 3 (depends on 1)

The assembly defined in claim 1 wherein said transfer layer consists of an ink-impregnated fabric.

### Claim 4 (depends on 1)

The assembly defined in claim 1, further comprising an impenetrable foil covering overlying at least part of said color transfer layer for preventing operator contact therewith.

### Claim 5 (depends on 4)

The assembly defined in claim 4 wherein said foil covering terminates inwardly of said array of typefaces.

### Claim 6 (depends on 4)

The assembly defined in claim 4 wherein said layer is flanked by such foil coverings.

### Claim 7 (depends on 1)

The assembly defined in claim 1 wherein said layer is composed of a material capable of drawing coloring material from said reservoir by capillary action.

### Claim 8 (depends on 1)

The assembly defined in claim 1 wherein said layer is mounted on said hub of said disk so as to rotate relative thereto by inertia.

### Claim 9 (depends on 1)

The assembly defined in claim 1, further comprising mechanical members for angularly stepping said layer relative to said disk.

### Claim 10 (depends on 1)

The assembly defined in claim 1, further comprising an impenetrable layer disposed between said transfer layer and said disk inwardly of said array of typefaces.