# US 4,392,756 A · Serial printing apparatus

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- Number: US 4,392,756 A
- Document ID: US4392756A
- Status: Granted
- Kind: A
- Application number: 06/216,898
- Filed: 1980-12-16
- Granted: 1983-07-12
- Earliest claimed: 1979-12-31
- Assignees: Gold Star Co., Ltd.
- Inventors: Hyun C. Lee
- Web page: https://patentgrep.com/patent/US4392756A

## CPC

- B41J 1/24: the plane of the type or die face being perpendicular to the axis of rotation (B41J1/60 takes precedence)
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A printing apparatus comprising a printwheel with a hub and spokes extending therefrom, each of the spokes having at least two different types of character slugs thereon; a rotatable printwheel; a motor for shifting the printwheel up or down and for rotating the printwheel, so as to place a selected slug at a desired printing location; and a second motor for driving the printwheel up or down.

## Claims

### Claim 1

A printing apparatus comprising:
a printwheel with a hub and spokes extending therefrom, each of said spokes having at least two different types of character slugs thereon;
first drive means attached to the printwheel for rotating said printwheel;
shifting means attached to said first drive means for shifting said printwheel and said first drive means up or down with rotational motion to place a selected character slug at a desired printing position; said shifting means including:
a latchbase having a first and a second end;
a hinge connected to said first end of said latchbase;
a slot positioned in said latchbase near said second end of said latchbase;
a spring having a first and a second end, positioned in said slot, said first end of said spring being attached to one end of said slot;
a movable springbar connected to said second end of said spring; and
a crank pin positioned in said slot, and attached to said springbar, said crank pin being for driving said latchbase by sliding along said slot; and
second drive means for driving said shifting means.

### Claim 2 (depends on 1)

Printing apparatus of claim 1, further comprising means for controlling the displacement of the shifting means.

### Claim 3 (depends on 1)

A printing apparatus of claim 1, wherein the second drive means comprises
a d.c. motor having a shaft; and
a crank arm attached to said shaft and capable of rotation in either a clockwise or counter-clockwise direction;
said pin being attached to said crank arm.