DIY Paper Tape Punch - Mechanism diagram?

Tony Duell ard.p850ug1 at
Fri May 1 10:39:53 CDT 2020

On Fri, May 1, 2020 at 4:32 PM John Foust via cctalk
<cctalk at> wrote:

> Were there any paper tape devices that did not use the sprocket holes
> to move the tape?

Yes, both punches and readers.

The Facit 4070 (and the N4000) punch uses a capstan and pinch roller
to move the tape. It's driven by a stepper motor. Of course it punches
the sprocket holes.

As I said the other day several high-quality optical tape readers
(Trend, HP2748) feed the tape with a capstan and pinch roller. They do
take a timing signal from the sprocket holes of course.


> - John

More information about the cctalk mailing list