A few ideas:

[johnwarfin]

An extension of the original FIXED (non-moving) cartridge through a hole drilled in the side of the printer to a reservoir at the same level should eliminate any pressure associated problems.

How does the cartridge know that it was enlarged?

Any increase in volume at all, horizontal or vertical, will increase pressure at the nozzles. The resevoir of ink in those cartridges is not infinitely shallow. All ink is above the level of the outlet and therefore creating pressure unless compensated by external means (air sacks etc).

 

[BOYNTONSTU]

Any increase in volume horizontal will increase pressure at the nozzles.

This is scientifically incorrect!

Take a swimming pool 100' x 100' and fill it to a 1 foot level.

Place a divider into the pool to produce a pair of 100' x 50' pools.

The pressure of a 100' x 100' pool and a 100' x 50' pool filled to 1 foot will be exactly the same.

Increasing/decreasing the vertical height of the water is the only way to affect pressure.

 

[johnwarfin]

I don't think so. A 1" tube of water filled to the same level will have millions of times less pressure at the bottom than your swimming pool.

 

[BOYNTONSTU]

"I don't think so. A 1" tube of water filled to the same level will have millions of times less pressure at the bottom than your swimming pool."

You are confusing force and pressure.

Force = pressure/area

The pressure in a small diameter tube is the same pressure (pounds/sq in) as in the swimming pool example.

Remember, a tiny tubed instrument is adequate to measure atmospheric pressure.

fro, Wiki: http://en.wikipedia.org/wiki/Pressure

Pressure is an effect which occurs when a force is applied on a surface. Pressure is the amount of force acting on a unit area. The symbol of pressure is P.[1][2]


Mathematically:

P = \frac{F}{A}\ \mbox{or}\ P = \frac{dF}{dA}

where:

P is the pressure,
F is the normal force,
A is the area.

Pressure is a tensor quantity, and has SI units of pascal; 1 Pa = 1 N/m2, and has EES units of psi; 1 psi = 1 lb/in2.

Pressure is transmitted to solid boundaries or across arbitrary sections of fluid normal to these boundaries or sections at every point. It is a fundamental parameter in thermodynamics and it is conjugate to volume.
[edit] Units
Mercury column

The SI unit for pressure is the pascal (Pa), equal to one newton per square meter (N/m2 or kg/ms2). This special name for the unit was added in 1971; before that, pressure in SI was expressed simply as N/m2.

Non-SI measures such as pound per square inch (psi) and bar are used in parts of the world. The cgs unit of pressure is the barye (ba), equal to 1 dyncm-2. Pressure is sometimes expressed in grams-force/cm2, or as kg/cm2 and the like without properly identifying the force units. But using the names kilogram, gram, kilogram-force, or gram-force (or their symbols) as units of force is expressly forbidden in SI. The technical atmosphere (symbol: at) is 1 kgf/cm2. In US Customary units, it is 14.696 psi.

Some meteorologists prefer the hectopascal (hPa) for atmospheric air pressure, which is equivalent to the older unit millibar (mbar). Similar pressures are given in kilopascals (kPa) in most other fields, where the hecto prefix is rarely used. The unit inch of mercury (inHg, see below) is still used in the United States. Oceanographers usually measure underwater pressure in decibars (dbar) because an increase in pressure of 1 dbar is approximately equal to an increase in depth of 1 meter. Scuba divers often use a manometric rule of thumb: the pressure exerted by ten metres depth of water is approximately equal to one atmosphere.

 

[johnwarfin]

As an experiment punch a hole in a tall thin soda bottle and in a one gallon milk jug. Fill both to the same level and note the strength of the water spout. I performed this as part of a demo regarding float level in two stroke engine carbs.

Regardless of whether you want to talk about force or pressure the ink will come out of the nozzles faster when there is more ink in the tank.

 

[BOYNTONSTU]

As an experiment punch a hole in a tall thin soda bottle and in a one gallon milk jug. Fill both to the same level and note the strength of the water spout. I performed this as part of a demo regarding float level in two stroke engine carbs.

Regardless of whether you want to talk about force or pressure the ink will come out of the nozzles faster when there is more ink in the tank.

Fill a bathtub and open the drain.

The water will come out faster at first and it will slow down as the tub empties.

It matters not if it is a bathtub or a swimming pool at the same level if the outlet is the same diameter.

Sorry, but gravity does not know the width of the container, only its height.

 

[Grandad35]

I thought that Archimedes explained this a long time ago. See this link, about 1/2 way down with the 5 vessel shapes.

Watch this video.

 

[johnwarfin]

I am convinced you are right. It does not explain my carb experiment but there is no doubt pressure remains the same regardless of width of water column. Thanks for clearing that up guys.

 

[BOYNTONSTU]

Great! Now that we all agree that if we increase the volume of the ink cartridge and we keep the height the same, we will have more ink available at the same pressure as in the original cartridge.


Remember, this is a simple CISS for a fixed position cartridge printer that enables us to cut holes through the side of the printer and to mount a shelf to hold the ink reservoirs at the correct height.

 

[BOYNTONSTU]

EXTENDED CARTRIDGE anyone?


Basically what I was designing.


http://forums.hardwarezone.com.sg/showthread.php?t=2140697


http://www.sulit.com.ph/index.php/v...her+Brother+Printers+(LC51/57/960/37/10/1000)