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Daisy Wheel Printer with Print Line Visibility

IP.com Disclosure Number: IPCOM000050230D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Purcell, BD: AUTHOR [+2]

Abstract

This article relates to printers wherein the print line is not visible during the printing operation. It describes a mechanism for lowering the ribbon automatically upon the stoppage of printing so that the print line becomes visible. Devices for automatically lowering the ribbon upon the stoppage of printing are known in the art. However, they are customarily fairly complicated as compared to the apparatus of the present disclosure. The present apparatus utilizes the ribbon drive mechanism to affect the lowering of the ribbon upon stoppage. The ribbon drive mechanism has a cam therein arranged so that when the printer drive motor is moving in the operative direction, the ribbon will be maintained at its upper printing level.

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Daisy Wheel Printer with Print Line Visibility

This article relates to printers wherein the print line is not visible during the printing operation. It describes a mechanism for lowering the ribbon automatically upon the stoppage of printing so that the print line becomes visible. Devices for automatically lowering the ribbon upon the stoppage of printing are known in the art. However, they are customarily fairly complicated as compared to the apparatus of the present disclosure. The present apparatus utilizes the ribbon drive mechanism to affect the lowering of the ribbon upon stoppage. The ribbon drive mechanism has a cam therein arranged so that when the printer drive motor is moving in the operative direction, the ribbon will be maintained at its upper printing level. However, upon stoppage of the printing, the motor reverses itself and thus pushes the cam follower onto a different cam track which forces the lowering of the ribbon.

With reference to Figs. 1 and 2, the print wheel visibility feature involves a novel ribbon lift cam shown in these figures. During the normal operation of the printer in which the print line is not visible, the lift cam follower 7 rides on the inside track 1 which has a cam surface such that the ribbon will be in an operational position which will obscure the print line. During this normal mode of operation, there is no operator at the printer, and therefore the visibility of the print line is not required. On the other hand, when...