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Printer mod

N

news.virgin.net

Jan 1, 1970
0
I have built a flatbed printer from an old Epson 640 but need to fool the
printer into thinking there is paper in, when the drive stepper is disabled
I have tried timing relays but can't get it right. Does any clever person
know how I do this. This would be a great project if it were possible.
 
D

Don McKenzie

Jan 1, 1970
0
news.virgin.net said:
I have built a flatbed printer from an old Epson 640 but need to fool the
printer into thinking there is paper in, when the drive stepper is disabled
I have tried timing relays but can't get it right. Does any clever person
know how I do this. This would be a great project if it were possible.

If it is built from an old printer, then I would assume that it is a
centronics connector, that is fed from a db-25 connector.

Simply needs a resistor tied to the PE signal.

I did a writeup on it years ago that you can refer to:
http://www.dontronics.com/hints.html#dummy

Don...


--
Don McKenzie

Site Map: http://www.dontronics.com/sitemap
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USB Flash Drive interface for existing products.
http://www.dontronics-shop.com/product.php?productid=16654
 
M

Michael Black

Jan 1, 1970
0
Don said:
If it is built from an old printer, then I would assume that it is a
centronics connector, that is fed from a db-25 connector.

Simply needs a resistor tied to the PE signal.

I did a writeup on it years ago that you can refer to:
http://www.dontronics.com/hints.html#dummy
Somehow I was thinking it's an inkjet, the number just seems of
that type.

And hence, or maybe because the question suggested it itself, the issue
is some interlock that prevents the printer from operating. But perhaps
what I was thinking of as interlocks are merely sensors to pass a signal
to the computer via the interface.

I'd just find the actual switch, and deal with it, in this application.
Though, the question almost seems to suggest that the problem might
be a missing switch (because he says he modified the printer, but
now it's not working).

Michael
 
R

Rich Grise

Jan 1, 1970
0
I have built a flatbed printer from an old Epson 640 but need to fool the
printer into thinking there is paper in, when the drive stepper is disabled
I have tried timing relays but can't get it right. Does any clever person
know how I do this. This would be a great project if it were possible.

A piece of scotch tape over the switch actuator?

Good Luck!
Rich
 
N

news.virgin.net

Jan 1, 1970
0
I have kept the slotted optos and tried using 555 timers to simulate the
paper feed it did work a few times but then stopped I don't know if the
timing is too critical I might try a geared motor with a slotted disk if all
else fails but was wondering if there was a wiring trick, info on how
inkjets operate is so hard to find.
I can fool the paper feed sensor but not the paper detect switch it seems to
be about 6 to 8 seconds delay.
 
N

news.virgin.net

Jan 1, 1970
0
If only it was that simple, its all about timing.
 
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