DIY Paper Tape Punch - Mechanism diagram?
hpyle at cabezal.com
Fri May 1 07:18:41 CDT 2020
I've cut Mylar tape with a Glowforge laser. It cuts very nicely but the
alignment is a major hassle, plus you can only cut ~15" of tape which
doesn't go very far. Not worth the effort. If you were to build a custom
linear drive it might work. But also very slow.
Here's a picture of a mechanical (Teletype 33) punch block. These are
quite high-precision parts with hardened pins. The pins drive through a
narrow gape for tape, into matching holes in the top of the block. On the
Teletype, the drive mechanism is slow, and the punch sits quite a long way
from the single solenoid that sets up the bits. I assume high-speed
punches have a similar block but a more direct (parallel) actuator.
CuriousMarc has a good video showing this sort of punch in operation,
On Fri, May 1, 2020 at 12:02 AM Anders Nelson via cctalk <
cctalk at classiccmp.org> wrote:
> Hi all,
> I've had a paper tape reader for a while but never had a punch to make new
> tapes, and the ones i've found are not only very large but also very
> expensive. So I'm toying with the idea of making an open-source punch, but
> I can't find any detailed diagrams of how the mechanism works.
> I'm assuming (without any data to back it up) that there is a cam, an array
> of spring-levered pins, and horizontal spacers controlled by solenoids that
> bridge the gap between the cam and each punch pin when called for.
> Does anyone have insight into how reliable/fast paper tape punches work?
> Anders Nelson
> +1 (517) 775-6129
More information about the cctech