Funny I just sort of hit on somethin'....

Anyone ever noticed that while they refused to print they still flus
like the clappers...... as though the nozzles are bone idle

If the nozzles are blocked how does the ink get out..?

Dav

Maybe the head excretes it through the overflow valves.

It's a compelling question to say the least

Now just imagine if a design could be conjured to route that non-printing
ink back to the ink cartridge instead of the waste pad.
Now we're talkin' conservation.
It's sounding more like Dune every second, as in saving one's water.
Art, are you ready to go into business?

--
Jan Alter
(E-Mail Removed)
or
(E-Mail Removed)
"Davy" <(E-Mail Removed)> wrote in message
news:ugVPf.55491$(E-Mail Removed)...
> Funny I just sort of hit on somethin'....!
>
> Anyone ever noticed that while they refused to print they still flush
> like the clappers...... as though the nozzles are bone idle.
>
> If the nozzles are blocked how does the ink get out..?
>
> Davy
>

Hi Jan
Yeah I know during the cleaning cycle or nozzle cleans the suction i
greater, but during printing the only force is gravity and th
enertia generated by the nozzles

If the nozzles are blocked you'd think it wouldn't draw ink during th
pumping process. If it's clogged how does the ink get out, that wa
the reason for the question, is that logical I ask...

The recycled ink, all the inks would have to be kept well apart an
thought would have to be given to the cleaning process

Bicycle ink thats what you want.....

Ah well.., thought you might have given me 1 out of 10 at least - fo
thinkin'

Dav

Guess what Jan....
HP do this with some of their new models, the ink that is used for cleaning
goes back to the tank. I have no idea how that is accomplished but it's a step
in the right direction.
Tony

"Jan Alter" <(E-Mail Removed)> wrote:
>Maybe the head excretes it through the overflow valves.
>
>It's a compelling question to say the least
>
>Now just imagine if a design could be conjured to route that non-printing
>ink back to the ink cartridge instead of the waste pad.
>Now we're talkin' conservation.
>It's sounding more like Dune every second, as in saving one's water.
>Art, are you ready to go into business?
>
>--
>Jan Alter
>(E-Mail Removed)
>or
>(E-Mail Removed)
>"Davy" <(E-Mail Removed)> wrote in message
>news:ugVPf.55491$(E-Mail Removed)...
>> Funny I just sort of hit on somethin'....!
>>
>> Anyone ever noticed that while they refused to print they still flush
>> like the clappers...... as though the nozzles are bone idle.
>>
>> If the nozzles are blocked how does the ink get out..?
>>
>> Davy
>>

I'm afraid HP already has the patent on this. It is indeed what some of
their printers do. They recirculate the ink to remove air bubble and to
limit waste of ink.

On thing of interest that Epson did. On the little Picturemate
4x6 printers, the waste ink is pumped into a spare chamber in the ink
cartridge and discarded when the cartridge runs low, somewhat like laser
toner cartridges do.

Art

Jan Alter wrote:

> Maybe the head excretes it through the overflow valves.
>
> It's a compelling question to say the least
>
> Now just imagine if a design could be conjured to route that non-printing
> ink back to the ink cartridge instead of the waste pad.
> Now we're talkin' conservation.
> It's sounding more like Dune every second, as in saving one's water.
> Art, are you ready to go into business?
>

Think using the waste to ink tank chamber was mentioned way before Th
Epson Picture mate came out, way back when I was 'clackin' about mi
C62 saga, not sure if HP was mentioned

Wonder how you can flush ink out of a print head and yet they won
print..

Dav

The ink on an Epson is "vacuumed" out of the head passively.

If the ink is indeed coming out that way, the head is obviously filled
with ink. However, the piezo elements could be bad, of it could have
bad logic circuits, or the head could even not be connected
electronically. Ink coming out of the head during cleaning just means
the fluid mechanics are "working".

Art

Davy wrote:

> Think using the waste to ink tank chamber was mentioned way before The
> Epson Picture mate came out, way back when I was 'clackin' about mi'
> C62 saga, not sure if HP was mentioned.
>
> Wonder how you can flush ink out of a print head and yet they wont
> print..?
>
> Davy
>

> quote="Arthur Entlich"]The ink on an Epson i
"vacuumed" out of the head passively
>
> If the ink is indeed coming out that way, the head is obviousl
filled
> with ink.
Can appreciate there is more pressure from the pump than a prin
cycle
>
> However, the piezo elements could be bad, of it could have
> bad logic circuits, or the head could even not be connected
> electronically
>
Thats what I deduced when given thought
> Ink coming out of the head during cleaning just means
> the fluid mechanics are "working"
>

You can see now what made me think about it, if it clogged i
shouldn't flush

Dav

I can completely understand what you mean. I'd still like to know how the
design works for how the ink is coming out of the head, but not through the
nozzles. How is the ink ' "vacuumed" passively '?

--
Jan Alter
(E-Mail Removed)
or
(E-Mail Removed)
"Davy" <(E-Mail Removed)> wrote in message
news:%lAQf.64677$(E-Mail Removed)...
>> quote="Arthur Entlich"]The ink on an Epson is
> "vacuumed" out of the head passively.
>>
>> If the ink is indeed coming out that way, the head is obviously
> filled
>> with ink.
> Can appreciate there is more pressure from the pump than a print
> cycle.
>>
>> However, the piezo elements could be bad, of it could have
>> bad logic circuits, or the head could even not be connected
>> electronically.
>>
> Thats what I deduced when given thought.
>> Ink coming out of the head during cleaning just means
>> the fluid mechanics are "working".
>>
>
> You can see now what made me think about it, if it clogged it
> shouldn't flush.
>
> Davy
>

On 11-Mar-2006, "Jan Alter" <(E-Mail Removed)> wrote:

> >> Ink coming out of the head during cleaning just means
> >> the fluid mechanics are "working".

My experience has been that ink or cleaning fluid can
flow through the head and jets, yet it still won't print.
Tested with a simple syphon; bottle on a shelf,
in-line flow indicator, and small bore rubber tubing
over the ink cartridge spike. Fluid flows drop by
drop, at about 20sec intervals.
Which leaves you with dead piezo elements,
(and it's unlikely that all would die at once),
or electronics, which is more likely if no jets
or colours print.
If it's head or electronics, then no amount
of cleaning or special techniques will fix it.
Design of Epson heads, as illustrated in
their service manuals, suggests that it is
a through path and that ink only comes out
when forced by the piezo element.
It looks like a simple chamber, piezo element
expands, ink is forced out through jet, ink
can't go back towards the cartridge because
of the reverse flow resistance.
Piezo shrinks and ink fills the chamber,
or rather the channel sice the chamber is a
channel feeding all the jets of the same
colour. There being a channel for each colour.