Digital BW, The Print

Eric, allow me to put in a comment or two here-one function is to 
provide an exit from the ink stream for air trapped in the lines. The 
air floats to the top, ink exits out the bottom as in a cartrdge. But 
it exits from the same orifice as a cartridge, and frankly I think 
you're going to find it very difficult to mount the dampers 
externally, and connect the exit port to the intake port on the head 
without leaks. And you would still need enough tubing to allow the 
carriage full movement, which might affect the pressure control 
function.

Some of the recently available CIS units (Chinese, but what isn't 
nowdays?) have half-size carts that are essentialy a damper with an 
auto reset chip in a shape that clicks into place like a cartridge. 
This is a much more practical solution, even if you cut the tubes and 
put large bottles (the tanks hold 220ml) or IV bags or whatever on 
the other end. And the price is reasonable- the entire unit costs 
less than a set of auto-reste chips from MIS or Mediastreet. I've had 
2 going for several months, no problems so far. Check this link-its 
worth a look.

http://stores.ebay.com/SuperJetUSA-
Store_W0QQcolZ4QQdirZ1QQfsubZ0QQftidZ2QQpZ3QQtZkm


Steven Karafyllakis




 ---- In DigitalBlackandWhiteThePrint@yahoogroups.com, "brigsby707" 
<brigsby707@...> wrote:
>
> Hi Ernst,
> 
> Thank you for the information. However I'm a little confused. You 
said
> there are 3 functions the dampers fulfill. But, from what you wrote 
I
> only caught the bit about filtration and pressure regulation. What 
is
> the third?
> 
> As I mentioned in the first post, I am interested in using an
> adjustable device to hold the chips in place and use some sort of
> dampening in the CIS lines external to the printer (specifically 
small
> format). From Duane's post I gather that I might have some luck 
using
> large format dampers but might have to deal with differing tube 
sizes.
> 
> But just to get the ball rolling I think I will be ordering some 
Epson
> 3000 dampers and have some fun tinkering.
> 
> Your comment regarding the load on the carriage has me wondering, if
> the dampers aren't in the printer's carriage and just connected via
> tubing whether the printhead would be too light. But I don't think 
it
> would be a problem as the printer operates fine with carts whether
> they are full or nearly empty. I guess there's no way to know other
> than to try it out.
> 
> Any additional ideas would be appreciated.
> 
> 
> Best Regards,
> 
> Eric Ashworth
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla
> <E.Dinkla@> wrote:
> > 
> > The dampers have 3 functions:
> > the sieve to filter any filth or pigment agglomeration from 
> > the ink stream,
> > the membrane keeps the ink pressure at the air pressure,
> > as an ink buffer to reply on sudden demand.
> > 
> > The cart design functions in similar ways to keep a 
> > corresponding ink pressure:
> > the bag has the same air pressure around it,
> > the vertical bag in the cart folds horizontally so the ink 
> > level remains more or less the same and the seal is halfway 
> > the bag content.
> > 
> > Replacing the dampers isn't a good idea given the 
> > fundamentals of the unpressurised wide format ink supply
> > systems.
> > 
> > It is possible that some design aspects of the heads or 
> > (desktop) carts have to do with the left right acceleration 
> > of the head carriage and the influence of that on the ink 
> > supply. If I recall it correctly the old Crystaljet wide 
> > format (Calcomp, Summigraph ?) available more or less before 
> > Epson entered the market with the 9000 got a patent claim 
> > case against it on that head design aspect. Two buffers + 
> > two ink channels, one left, one right to solve that dynamic 
> > ink pressure issue. Wonder if there's something like that in 
> > the head or in the desktop cart. In the last case it has to 
> > be addressed too.
> > 
> > For any 3 MK 3 PK system a distribution system on the head 
> > carriage to serve the 6 heads with only two dampers and two 
> > ink lines from the big carts will make the load on the head 
> > carriage lower.
> > 
> > 
> > -- 
> > Met vriendelijke groeten, Ernst
> > 
> > 
> > |  Dinkla Grafische Techniek  |
> > |     www.pigment-print.com    |
> > |             ( unvollendet )            |
> >
>