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| Solenoids Used in Braille Printers |
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Braille words are printed by forming raised dots on paper. In this process, solenoids are used to drive a pin containing a special tip that forms a raised dot. Through a combination of impact force and pressure which forces the paper into a cavity a stationary platen, the solenoid forms the Braille dot. When these dots are arranged in a pattern, they form Braille letters. The letters then form words.
Tubular solenoids are in use in Braille printers. The solenoids are used in the push mode and directly emboss the paper or strike a secondary pin that contains the Braille tip which embosses the paper. The embossing pin is returned by a spring which is a part of the solenoid, or by a spring attached to the secondary embossing pin.
Diagnostic capability can be added to the printers by installing electronic position sensors on the solenoids. A circuit will provide a feedback signal to indicate whether the solenoid has accomplished the embossing function or not.
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