Browse Prior Art Database

Dot Bar Impact Matrix Printer

IP.com Disclosure Number: IPCOM000050938D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Lane, R: AUTHOR [+4]

Abstract

This publication describes an improved dot-bar impact matrix printer.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 73% of the total text.

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Dot Bar Impact Matrix Printer

This publication describes an improved dot-bar impact matrix printer.

An impact printer presently available in the art is referred to as a bar-bar impact matrix terminal printer. Because the print image is created by the intersection of two bars, the print quality is not good, and a serious shadow print problem occurs because the long bar-shaped platen of the device will contact the ribbon and paper at all times.

It is proposed herein to provide an improved printer having better print quality and reduced shadow printing with horizontal shadow print eliminated completely by using a rotating disk with embossed dots as a platen instead of a rotating bar platen.

The structure is shown in Fig. 1 wherein a narrow vertical bar print hammer 10 strikes the paper 12 on to the dot wheel 14 to form a well-defined dot image. The height of the faced hammer 10 covers the height of a print character. The spacing between dots on the disk 14 is larger than the hammer height. Between the rotation of the disk and the strikes of the hammer, a series of vertical dot images can be printed, as shown in Fig. 2 which illustrates the printing sequence when the wheel and hammer move from left to right at a constant speed. The hammer unit 16 and the disk 14 are caused to move together along the paper width by cables or lead screws. The paper steps a character line as a print line is completed.

As shown in Fig. 2, the printed image has a slight skew in the vertic...