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Improved Safety and Reliability in Electrothermal Printers

IP.com Disclosure Number: IPCOM000047123D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Davis, MI: AUTHOR [+2]

Abstract

This article describes new fault-detection capabilities for printers using electrothermal technology. As a result of the fault-detection signals generated by the technique described in this article, the controller of the printer (stored program computer or otherwise) can take appropriate action to prevent equipment damage or other hazard. It can also indicate to the operator that corrective manual intervention is required. Fig. 1 is a stylized representation of part of a resistive-ribbon printer. The resistive ribbon R is transported, as printing proceeds, from a supply spool B to a take-up spool A. A supply electrode C is in contact with the ribbon, and by connection to a stabilized power supply D raises the potential of the entire ribbon to a voltage of 20V to 40V.

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Improved Safety and Reliability in Electrothermal Printers

This article describes new fault-detection capabilities for printers using electrothermal technology. As a result of the fault-detection signals generated by the technique described in this article, the controller of the printer (stored program computer or otherwise) can take appropriate action to prevent equipment damage or other hazard. It can also indicate to the operator that corrective manual intervention is required. Fig. 1 is a stylized representation of part of a resistive-ribbon printer. The resistive ribbon R is transported, as printing proceeds, from a supply spool B to a take-up spool A. A supply electrode C is in contact with the ribbon, and by connection to a stabilized power supply D raises the potential of the entire ribbon to a voltage of 20V to 40V. A plurality of fine electrodes, physically gathered and closely spaced at the head H, are connected to driver transistors T1 - TN . To cause a dot to be printed, appropriate driver transistors are caused to conduct by digital logic L. Potential causes of failure to print may include a failure of the power supply D, a break in the ribbon R, a failure of the electrode C to remain in contact with the ribbon R, or a failure of the head H to contact the ribbon R correctly. A second failure type can occur where the ribbon R inadvertently contacts a grounded part of the mechanism. This may be due to mis-threading of the ribbon or mechanical failure,...