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Ribbon Shield Structure for Printer

IP.com Disclosure Number: IPCOM000046128D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Olson, ST: AUTHOR [+2]

Abstract

A ribbon shield device is provided for preventing ribbon smear in printers which have very tight tolerances between the ribbon and the paper. In order to prevent such smearing, a very thin stainless steel band is utilized in the area about the print point. The stainless steel band has an opening which permits the impact member to drive the ribbon through this opening to print on a substrate. We have observed that very thin stainless steel shields used for this purpose tend to undergo some buckling or distortion when pressure is applied from an outside source, such as an outfold in a continuous form. In order to prevent this, magnetically charged cylinders may be used adjacent to a thin magnetic member to provide a magnetic field which maintains the same shape as a stainless steel member but without buckling.

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Ribbon Shield Structure for Printer

A ribbon shield device is provided for preventing ribbon smear in printers which have very tight tolerances between the ribbon and the paper. In order to prevent such smearing, a very thin stainless steel band is utilized in the area about the print point. The stainless steel band has an opening which permits the impact member to drive the ribbon through this opening to print on a substrate. We have observed that very thin stainless steel shields used for this purpose tend to undergo some buckling or distortion when pressure is applied from an outside source, such as an outfold in a continuous form. In order to prevent this, magnetically charged cylinders may be used adjacent to a thin magnetic member to provide a magnetic field which maintains the same shape as a stainless steel member but without buckling.

With reference to the figure, which is an exploded view of ribbon shield and associated printhead, a band 10, having appropriate tensile strength, is normally seated in ribbon guide member 11 in a window therein 18 which receives band
10. Band 10 has an opening 19 through which the printing takes place. The printhead 12 is seated and fixed within printhead tip guide 13 which also supports shield guide 11. The printhead further includes a pair of magnetically charged cylinders 16. The thin band 10 has a like charge as cylinders 16. This creates a repelling magnetic force between the band 10 and the cylinders 16 at the ribbon...