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'[EE] DIY inkjet head'
2009\02\28@120526 by Ricardo de Azambuja

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Hi!

I am trying to find some info on how to build a inkjet head, but I got
nothing :(

My idea is make a low res (50dpi?) to print direct on the walls. I
had seen one made of spray cans, but its just too big.

Someone know where can I find some info?


Thanks!

---------------------------------
Ricardo de Azambuja

2009\02\28@134351 by William \Chops\ Westfield

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On Feb 28, 2009, at 9:05 AM, Ricardo de Azambuja wrote:

> I am trying to find some info on how to build a inkjet head, but I got
> nothing :(
>
> My idea is make a low res (50dpi?) to print direct on the walls. I
> had seen one made of spray cans, but its just too big.

I don't think that the technology used in modern inkjets  
(piezoelectric, thermal "bubblejet") scales "up" to larger sizes; the  
physics would seem to be pretty dependent on moving very small bits of  
ink around.  (the HP thinkjet, 1984, was the first consumer (thermal)  
inkjet printer, and had a resolution of 150x150dpi.)  You may want to  
look at the older "continuous ink jet" technology (used for marking  
commercial products), but it sounds big, messy, monochrome, and  
complicated.

BillW

2009\02\28@195511 by M. Adam Davis

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As Bill pointed out, the techology used to make modern inkjets depends
on the physics of very small droplets.  It won't easily scale up to
50dpi.

You might look at a cheap airbrush:

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=47791

Figuring out how it works (blowing air across the ink nozzle pulls the
ink into the airstrem) might give you some ideas on how you can create
very small air-compressor powered, solenoid controlled inkjet heads.

If you need it to be small, you might look at little disposable CO2
cartridges rather than the compressor, and scale it down so it uses
very little air to paint a dot.

Good luck!

-Adam

On Sat, Feb 28, 2009 at 12:05 PM, Ricardo de Azambuja
<spam_OUTricardo.azambujaTakeThisOuTspamgmail.com> wrote:
{Quote hidden}

> -


'[EE] DIY inkjet head'
2009\03\01@070619 by Tony Smith
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face
> I am trying to find some info on how to build a inkjet head, but I got
> nothing :(
>
> My idea is make a low res (50dpi?) to print direct on the walls. I
> had seen one made of spray cans, but its just too big.
>
> Someone know where can I find some info?


50DPI is dots about 0.5mm.  A bit big for normal inkjet printers, but about
right for dot matrix.  Maybe you can load up a ribbon with a lot of ink, or
figure out a way to drip paint over the pins.

You can get exactly what you want, Google "product marking" and be astounded
by the prices.  As a bonus, these systems are often non-contact, and can
spray ink about 10mm or so.

There's a few different types, one type uses pressure to squirt tiny drops
of ink.  I'm not exactly sure how that works, apparently solenoids are
involved (like dot matrix I suppose).  Have a rummage at
<http://www.google.com/patents>.  

You may be able to duplicate that with a hypodermic needle.  The tube is too
narrow for the ink to flow, and applying a bit of pressure on the syringe
will get a tiny ball of ink at the tip (oh, grind the sharp bit off!).
Press this against the wall and the drop will transfer.  If you release the
pressure in the syringe plunger at this point it'll suck the ink back in,
and so releases just the drop.  A stepper driving a fine pitch threaded rod
is needed.

Of course for colour you'll need a few of them.

Tony

2009\03\01@234613 by Eoin Ross

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This site/company has more nozzles than you poke a stick at.
http://spray.com/

Not sure if they can help with what you want to do but they may have run into a similar operation.


>>> On 28 Feb 09 at 12:05, in message
<.....463443c60902280905r5ebd7dedl8c87e4a620b60e61KILLspamspam@spam@mail.gmail.com>, Ricardo de
Azambuja <ricardo.azambujaspamKILLspamgmail.com> wrote:
{Quote hidden}

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