Illinois Tool Works 5750-440, Operation Manual

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OPERATIONS MANUAL – 5750440 – REVISION D
Mechanical continued
C1
Printhead Operation
Ink flows into the printhead through an inlet filter [E] , and into the valve body. The valve body consists of
a back plate [F] , membrane [N] , chamber plate [G] , front seal [H] and orifice plate [L] . Ink flows into the
chamber plate and is sealed by the piston applying a force, to push the membrane against the chamber
plate post
[I] . The membrane sealing force (pre-load) is initially adjusted to seal against ink pressure at
9 psi to prevent static leakage at the normal operating pressure of 7 psi. This “pre-load” adjustment
controls the amount of force the piston
[D] applies to the membrane. Rotating the red adjustment nut
[O] sets the pre-load pressure by moving the entire solenoid assembly in a linear movement, to
increase or decrease piston loading on the membrane (clockwise to decrease pre-load, counter
clockwise to increase pre-load).
Valve Body Closed
[A]
[B]
[C]
[F]
[D]
[N]
[M]
[L]
[K]
[J]
[E]
[O]
[G] [H]
[I]
[P]
[I] Chamber Plate Post
[J] Slotted Channel for Single Column Orifice Array
[K] Orifice
[L] Orifice Plate
[M] Ink at 7PSI
[N] Membrane (Acts as Valve Seal)
[O] Adjustment Nut
[P] Ink Droplet
[A] Mounting Strip
[B] Bushing
[C] Solenoid
[D] Piston
[E] Ink Inlet Filter
[F] Backplate
[G] Chamber Plate
[H] Seal