ITW Diagraph PA/4600, Руководство пользователя

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Step 11 - Set the Vacuum, Air, and Blow Values
Goal:
Set the air assist flow control, vacuum and blow pressure, and blow flow control.
•••• Sub-Step (a) ••••
The air assist is used to guide the label toward
the tamp pad while being dispensed from the
printer. The air assist uses a portion of the
incoming line pressure; the adjustment of screw
(A) controls the amount of air used to guide the
label. Clockwise adjustment decreases the air
flow and counter-clockwise will increase it. Use
the Pneumatic Diagnostic Screen (
page 31
) to
test the air assist once the adjustment is made.
Too little air assist will result in labels curling
away from the pad during feed; too much assist
will cause the label to fly off of the pad.
•••• Sub-Step (b) ••••
The vacuum generator and blow valve are
controlled by the same pressure regulator, knob
(B). To adjust this pressure, first unlock the knob
by lifting it. Once it is unlocked, rotate the knob
clockwise to reduce pressure and counter-
clockwise to increase it. Since the blow valve has an additional trim of a dedicated flow control, set
the pressure as high as necessary for vacuum. Typically, a pressure range between 30 and 60 psi will
be acceptable, with the possibility of making this higher if this is a blow or tamp/blow application. Too
much pressure will make the label buckle as it is fed to the pad; too little vacuum will not hold the label
in place.
•••• Sub-Step (c) ••••
The blow flow control will limit the amount of air
force that the blow cycle exerts, which is useful to
combat the problem of too much blow. While a
strong amount of air will transfer the label through
the air to the product, too much blow will actually
work to hold the label in place (Bernoulli Effect).
Use this screw adjustment (C), to decrease the
blow force by turning in the clockwise direction,
and counter-clockwise to increase it. Again, use
the diagnostic screen to test this setting as
adjustments are made.
A
C
B
A - Air Assist Flow Control
C - Blow Flow Control
B - Vacuum/Blow Pressure
Dec. Inc.
Diagraph - an ITW Company PA/4600 & PA/6000 User Manual
Setup Page 21
Setup