Browse Prior Art Database

Thermal Printer Employing Heat Sink to Enhance Lift-Off Correction

IP.com Disclosure Number: IPCOM000047702D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Campbell, AS: AUTHOR

Abstract

A thermal printer 11 effects printing by injecting current into a conductive ribbon 13 from a printhead 15 having plural print electrodes mounted thereon. The injected current effects localized heating, causing ink on the surface 17 of the ribbon 13 to melt and transfer to a document 19. As printing occurs, the printhead is relatively moved with respect to the document 19, thus forming complete characters of printing. In order to remove previously printed characters, less current is injected into the ribbon 13, causing its ink surface 17 at the print point to tackify and bond to the ink on the document 19. It is necessary for the ribbon to thereafter cool in order that the previously printed ink might adhere to the ribbon and be removed from the document 19 upon separation of the ribbon 13 from the document 19.

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Thermal Printer Employing Heat Sink to Enhance Lift-Off Correction

A thermal printer 11 effects printing by injecting current into a conductive ribbon 13 from a printhead 15 having plural print electrodes mounted thereon. The injected current effects localized heating, causing ink on the surface 17 of the ribbon 13 to melt and transfer to a document 19. As printing occurs, the printhead is relatively moved with respect to the document 19, thus forming complete characters of printing. In order to remove previously printed characters, less current is injected into the ribbon 13, causing its ink surface 17 at the print point to tackify and bond to the ink on the document 19. It is necessary for the ribbon to thereafter cool in order that the previously printed ink might adhere to the ribbon and be removed from the document 19 upon separation of the ribbon 13 from the document 19. Thus, a heat sink 21 is pivoted from its printing position, shown in Fig. 1, to its remove position, shown in Fig. 2, against the ribbon 13, pressing the ribbon 13 against the document 19. The heat sink 21 serves to cool the bonded character prior to peeling it from the document 19. It also presses the ribbon 13 against the document 19 as the printhead 15 moves relative thereto until the time that it is desirous to peel the bonded character from the document 19. Early peeling is thus eliminated. The heat sink 21 is attached to the printhead 15 by a flexible hinge member 23. The heat sink 21...