Digital BW, The Print

Mark Savoia wrote:
> Walker,
> Do you think this will only happen when a cart is "almost" empty?  
> That is only when it happens, I put in a new cart(s) and it goes away.
> Mark

The O ring issue is an old one and could happen on 9000's 
too when dampers were replaced too often and the nut on the 
connection turned too tight. We solved it the same way. 
Normally it shouldn't be too tight for the inkflow.

But on the pressure getting lower at the end of a cart's 
life is more likely the result of the ink bag in the cart 
folding up not as nice as the Epson engineers hoped for and 
by that the ink level dropping more versus the head height 
than with a fresh ink cart. The ink bag stands vertical on 
the long side in the cart and the ink seal that connects to 
the printer ink line is exactly in the center of the short 
side of the bag. The ink level should stay the same as the 
bag flattens horizontally and all the ink still occupies the 
vertical shape of the bag and by that ink pressure is kept 
consistent. But as written at the last mls it will no longer 
work as nice as expected and the bag flattens totally at the 
top while the rest of the ink is more at the bottom. Could 
be that Epson solved that problem at the 9600 introduction 
by letting more ink in the carts than the customers liked. 
The last got their firmware upgrade to solve that kind of 
ink waste but possibly another issue in return.

My 9000 CIS system had ink bottles on springs to keep the 
ink level equal.

With the pressurised carts it will be less of a problem 
although there is still an ink bag inside and on the 9800 
the bag is a bit more complicated so they could make the 
cart smaller. It is nicer to have a real ink pump in every 
cart like the HP Z3100 (and more HP models) has or the 
continuously pumped ink loop of the Canon iPF models that 
keep both carts and ink lines fresh.

-- 
Met vriendelijke groeten,  Ernst


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