control an inkjet cartige

[hananl]

Hello,
Might someone happen to know a way to control the inkjet cartige with
pulse signals instead of the computer?
would like to build a circuit for that purpose.
I want to be able to "shoot" ink droplets from all the nozzles at the
same time. I need to know how to operate each of the pizo crystals, and
then to operate them all.
I guess I can measure the electrical signal coming from the contacts
that match up with the ones on the cartridge, but always much easier,
if someone already has that information...
Thanks,
Hanan.

 

[Lord-Data]

Epson printheads are typically fixed within the printer, not part of the
cartridge, so you may not be able to use an Epson one for what your after ..

You need a cartridge that contains a printhead within it, such as some older
canon's and nearly all but the most recent of HPs.

"hananl" <hlepek@gmail.com> wrote in message
news:1134743059.809038.175300@g43g2000cwa.googlegroups.com...

I want to shoot droplets of liquid that will be contained in the
catridge. then i want to collect each droplet and make measurments.
i know epson is using a pizo crystal, but don't really know how.

 

[rowan194]

What are you planning to do with them? Sounds messy.

 

[hananl]

I want to shoot droplets of liquid that will be contained in the
catridge. then i want to collect each droplet and make measurments.
i know epson is using a pizo crystal, but don't really know how.

 

[Roy]

"hananl" <hlepek@gmail.com> wrote in message
news:1134650483.575617.163320@g44g2000cwa.googlegroups.com...

Hello,
Might someone happen to know a way to control the inkjet cartige with
pulse signals instead of the computer?
would like to build a circuit for that purpose.
I want to be able to "shoot" ink droplets from all the nozzles at the
same time. I need to know how to operate each of the pizo crystals, and
then to operate them all.
I guess I can measure the electrical signal coming from the contacts
that match up with the ones on the cartridge, but always much easier,
if someone already has that information...
Thanks,
Hanan.

I recently repaired my HP 600 inkjet printer, and in the process of repairing it, I
analysed the circuit that activated the piezo jets. Hewlett Packard feed a group of six
of the piezos with a 19V source via a 21.5 ohm current limiting resistor (probably to
limit the capacitive current) and then ground the individual transducers with a simple NPN
transistor to ground. On my inkjet pins 1, 26 28 and 29 are the feeding points for the
19V source, just ground any of the other points momentarily to get it to spit out ink!
It is up to you to workout which are the common feeder points to the piezos on your
inkjet.
Good Luck
Roy



--
Please remove the numeral from my e-mail address to reply.