On Thursday (01/29/2009 at 07:22PM +0000), Tony Duell wrote:
probably better known in the CNC / automated machining world than
in computing but my hope is to resurrect it as a backup punch for copying
tapes I use with my ASR-33 and thereby save wear on the -33's punch.
I suspect it'll be considerably faster than the ASR33 too ...
I'm counting on that :-)
The unit has
serial and parallel interfaces on DB25 connectors but I do
not have any pinout information for those. The serial one I can probably
The parallel interface on the Facit 4070 became a de-facto standard for
punchs. I would see if any of the signals matched up with that one, if
they do, it's a fair bet that it's that interface.
OK. Thanks for that tip.
because as soon as you try to punch all eight holes with
the front panel test button, the power LED dims and the punch jams,
What type of mechanism does this punch use? In my experience there are 2
basic types :
1) Solenoids to driectly operate the punch pins (that is, the punching
force comes entirely from the solenoid), and a (stepper) motor to move
the tape. For example the Facit 4070
2) A continuously rotating camshaft (normally with a mains-powered
motor). The solenoids operate linkages (or clutches) to operate the punch
pins, the punching force comes form the motor, not the solenoids. Anther
solenoid opeates the tape feed mechanism, again the power comes from the
motor. For example the Teletype BRPE, Tally 420, etc.
Needless to say the solenoids in the second type are much smaller and
take much less current.
I don't know yet which style it is as I have not opened the unit up.
But, lacking the docs at this point, that is the next step.
It does correctly punch the feed holes and will appear to do so all
day long. It's only when I press the button with the big black dot
that it attempts to punch all eight holes and stalls. The feed hole
punching screws up then too.
from lack of umph to complete the mission. It could also be
jamming to start with and that causes the power drop I suppose.
Can you tuen things by hand (power off, of course) and operate the
solenoids by hand to see if the mechanism can be got to work?
Will find out in a day or two as soon as I receive the round tuits that
I ordered for the weekend.
I appreciate the info.