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This adapter unit greatly reduces the force required for operating key drive apparatus, such as a Perkins pattern braillewriter and the like.
English (United States)
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Electrification of Key Drive Apparatus
This adapter unit greatly reduces the force required for operating key drive
apparatus, such as a Perkins pattern braillewriter and the like.
A base unit 11 supports the braillewriter 10, as schematically shown. The
existing keys are ignored and auxiliary keys 1, which are the actuating buttons for
the key switches 2, are used. The base unit 11 contains the keys 1, switches 2,
a bank of selection solenoids 3, and a larger solenoid 6 for embossing. The
latter are mechanically coupled to the mechanism within the original machine 10.
The key switches 2 complete the circuits to the solenoids a for setting up pin
setup bails 4 through a suitable linkage 5, and operate the embossing solenoid 6.
Force is transmitted through a linkage 7 to the bail 8 of the braillewriter which
causes the anvil to form paper over the selected pins.
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