Embossing mechanism
  

Braille Printer Schematics

A project from 1980

Part of the Braille Printer Web Pages
by Douglas W. Jones
and Andrew Appel
THE UNIVERSITY OF IOWA Department of Computer Science and
Princeton University Department of Computer Science

This dates from when we worked at the University of Illinois School of Basic Medical Sciences at Urbana

Line Power
link to schematic, line power, fuse, switch, fan, grounding

24V Power
link to schematic, 2 parallel transformers, bridge, capacitor

8V and 16V Power
link to schematic, 2 transformers, bridges, capacitors for each

Control Circuitry
Which bit from the parallel ports controlled what
part has been reverse engineered from photographs.
Beware that this may be subject to small errors.
link to schematic, transistors controlling power to moving parts

Input and Mode Switches
Unfortunately, records of which switch went
to what bit of the parallel port are lost.
link to schematic, switches as input to the single card computer