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This article describes a method for producing typewriter keys with special characters which utilizes a resistive ribbon transfer printing process.
English (United States)
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Resistive Ribbon Printing of Typewriter Keys
This article describes a method for producing typewriter keys with special
characters which utilizes a resistive ribbon transfer printing process.
With this process, a resistive ribbon 10 is held firmly in contact with the
typewriter key 12 by a wire matrix print head 14. The resistive ribbon 10
comprises a resistive layer 16, an electrically conductive layer 18 and a transfer
layer 20 of the desired color.
The appropriate wires 22 in matrix print head 14 are electrically energized so
that the desired character is formed. The area 24 of the transfer layer adjacent
energized wires 22 is melted due to I/2/R heating in the adjacent area 26 of the
resistive layer, resulting in transfer of the thermal transfer layer to the typewriter
key 12 in the desired character pattern.
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