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Print Magnet Coil

IP.com Disclosure Number: IPCOM000090548D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Cowburn, G: AUTHOR

Abstract

Hammer flight time, seal time, and the striking force in printers are affected by changes in resistance of the print hammer magnet coil under varying operating conditions. Adequate compensation for these changes is difficult to obtain. As a result, variations often occur in the character position and the density of print. By employing an alloy for the print hammer magnet coil having a low-temperature coefficient of resistance, changes in resistance can be minimized and the usual thermistor compensation can be eliminated.

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Print Magnet Coil

Hammer flight time, seal time, and the striking force in printers are affected by changes in resistance of the print hammer magnet coil under varying operating conditions. Adequate compensation for these changes is difficult to obtain. As a result, variations often occur in the character position and the density of print. By employing an alloy for the print hammer magnet coil having a low-temperature coefficient of resistance, changes in resistance can be minimized and the usual thermistor compensation can be eliminated. Using, for example, a copper-nickel alloy or a copper-manganese alloy having a resistivity on the order of 30 ohms per circular mil foot and a temperature coefficient of resistance on the order of 1300 x 10/-6/ ohms/degree C, sufficiently stable operation is obtained that the thermistor can be eliminated with no change in print quality.

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