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Simple Dot Band for Rear Printing

IP.com Disclosure Number: IPCOM000043126D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Lane, R: AUTHOR

Abstract

Dot band printing and dot drum helix printing technologies include a complex chemical etching process to fabricate the dots. For the band it is a multi-step process, first etching the dots then the leaf spring. With the drum the lithography has to be preformed on a surface which is not flat, requiring special equipment. This article describes a simple band, which can be punched, chemically etched, or machined. Fig. 1 shows a part of the band, with dots and timing marks. The band rotates continuously, behind the ribbon and paper. Fig. 2 shows the hammer, paper, and the ribbon. The hammer is actuated when a dot is required. The dots travel in the horizontal plane, giving the horizontal dots, the paper steps in the vertical plane, giving the vertical dots, thereby forming the matrix.

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Simple Dot Band for Rear Printing

Dot band printing and dot drum helix printing technologies include a complex chemical etching process to fabricate the dots. For the band it is a multi-step process, first etching the dots then the leaf spring. With the drum the lithography has to be preformed on a surface which is not flat, requiring special equipment. This article describes a simple band, which can be punched, chemically etched, or machined. Fig. 1 shows a part of the band, with dots and timing marks. The band rotates continuously, behind the ribbon and paper. Fig. 2 shows the hammer, paper, and the ribbon. The hammer is actuated when a dot is required. The dots travel in the horizontal plane, giving the horizontal dots, the paper steps in the vertical plane, giving the vertical dots, thereby forming the matrix. Multiple dot patterns can be formed on the edge of the drum, as shown in Fig. 3. As can be seen in Fig. 3, any desired combination can be fabricated. The band thickness is variable so as to determine one of the dimensions in the dot; i.e., if a 20-mil dot is required, than the band would be 20 mils thick. The main advantages of this approach are simplicity of the band, ease of fabricating any dot pattern, uniform wear of the dots (same as dot band), and ease of replacement of band by the customer.

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