Digital BW, The Print

brigsby707 wrote:
> Hi Duane,
> 
> I didn't realize you had already suggested the idea of a Cart-Less CIS
> and after reading your previous post, apparently all I did was
> reinvent your wheel with a couple slight differences, (have the
> dampers outside the printer and the adjustable structure to hold the
> chips). I guess great minds think alike ;P
> 
> Anyway, I was wondering if you have any idea as to what size tubing
> would be needed to pull this off. And, if different sizes are needed,
> how would I go about splicing the tubes. I have an old bulk ink system
> for the 1280 that I've never used and that I'd like to play with,
> either with the 1280 or an R200 I have. But, I've never worked with
> any of the large format dampers and don't have any experience with
> using tubing on the printhead inlets. Any tips/suggestions/knowledge
> would be greatly appreciated.
> 
> Best Regards,
> 
> Eric Ashworth
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "dlruckus"
> <dlruckus@...> wrote:
>> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark"
>> <paul.roark@> wrote:
>>
>>> But lots of people use these devices regularly without much worry
>> about ink
>>> level.  It think some work here might make the units work better
>> than >they do already, however.
>>>  
>>> Paul
>>>
>>  That was the reason for suggesting IV bags. However, one can simply
>> use rinsed out 3000/7000/9000 carts reloaded with whatever ink you
>> choose. The tubing then has a damper on one end and a needle for the
>> cart on the other. Solves all of the air and ink height problems. Set
>> the carts beside the machine with tape or a big rubber band around
>> them and you're in business.
>>  Why work hard to invent something different when the system the wide
>> formats use works just fine and can be duplicated easily.
>>  Also, no one can sue you for using Epson parts you own in any way you
>> see fit privately. They can't patent tubing,needles and glue or go
>> after the sale of chip reset devices either.
>>  Another method could use the filters you talked about some time ago
>> inline with the tubing and add a 'T' stub to the tubing near the head
>> inlet to give an empty chamber for damping. That would do away with
>> expensive dampers as well.
>>
>> Regards
>> Duane

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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