16 Jun
2015
16 Jun
'15
12:46 p.m.
> On Jun 16, 2015, at 12:31 , Paul Koning
<paulkoning at comcast.net> wrote:
> Part 1: two capstans spinning all the time, in opposite directions.
Solenoid-activated pinch rollers would
> press the tape against the capstan to set it moving.
That's also how the magnetic card is moved in and
out in the Mag Card II typewriter. There's a pair of counter-
rotating capstan wheels below the card, and a pair of solenoid-actuated pinch rollers
opposite them, above the
And how the paper tape is moved in a Trend HSR500 reader. 2 capstans, one each side of the
read head
and 2 solenoid-operated pinch rollers under them. And an electromagnet and armature as a
brake.
For something even madder, look at the design of the original Radio Shack 'Line
Printer' which was
actually a Centronics something-pr-other (733?). This thing (which is not a line printer
at all) has a belt
running across the chassis with a motor continuously driving it (a shaded pole motor I
think). Solenoids
on the printhead carriage grab the top or bottom run of the belt depending on which way
the carriage
is to move.
-tony