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Electrical and Mechanical Mechanism for Thermal Transfer Printing

IP.com Disclosure Number: IPCOM000084913D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Mitchell, JL: AUTHOR [+2]

Abstract

A thermal printer 2 includes a thin cylinder 4 on which is coated a surface 6 which is a resistive medium. An ink ribbon 8 is wrapped partly around the cylinder 4, and the cylinder and ribbon 8 move in an angular direction of an arrow 10, rolling in the direction of an arrow 14 across a paper 12. The paper 12 rests on a platen 16.

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Electrical and Mechanical Mechanism for Thermal Transfer Printing

A thermal printer 2 includes a thin cylinder 4 on which is coated a surface 6 which is a resistive medium. An ink ribbon 8 is wrapped partly around the cylinder 4, and the cylinder and ribbon 8 move in an angular direction of an arrow 10, rolling in the direction of an arrow 14 across a paper 12. The paper 12 rests on a platen 16.

A plurality of point contacts 18 are spaced longitudinally to the cylinder 4 and in contact therewith, and are selectively energized to apply current to the cylinder at particular spots which are in contact with energized electrodes 18, for causing I/2/R heating of the contacted areas. The heated portions of the cylinder 4 then come in contact with the ribbon 8 and together contact the paper 12 for causing transfer of ink to the paper.

The heated portions of the cylinder 4 the cool while rotating back to the region where the electrodes 18 are located. A thermal conductive element 20 may be included to cool the previously heated regions of the cylinder 4 prior to once again contacting the electrodes 18.

Alternatively, rather than having the cylinder 4 coated with a resistive medium 6, a plurality of resistive studs may be mounted on the cylinder for contacting the respective electrodes 18 as the cylinder rotates. Also, a continuously moving belt made of a resistive material could be used in place of the rotating cylinder 4.

Higher speeds are capable with this thermal print...