Digital BW, The Print

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
> 
> 
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