Diagraph PA/4000, Руководство по обслуживанию, Страница: 147 / 213

Technician’s Guide 2-3
2.1.2 PA/4000 MECHANICAL THEORY OF OPERATION
PA/4000 STAND
The PA/4000 operates in a variety of positions to allow for greater flexibility. The yoke
assembly rotates about the stand by loosening the center bolt that fastens the yoke to the stand
and re-tightening when in the desired position.
The main unit rotates within the yoke assembly by loosening the 2 end bolts and re-tightening
when in the desired position. Thus, labels can be applied on the top of a box or on the side of a
box. By adding the Secondary Wipe Down Assembly to the system, labels can be applied to
both the side/front or side back of a box. The PA/4000 vertical positioning is flexible as well
and can be adjusted with the crank handle on top of the stand.
PA/4000 MAIN UNIT
The main unit, consisting of the Air Control Unit, the Print Engine and Label Supply and
Rewind Hubs, is the heart of the PA/4000. Power is supplied to the main unit via factory
power at 120 VAC.
Air is supplied to the Air Control Unit from the Air Filter Assembly via factory air. Control of
the vacuum air pressure at the tamp pad, air assist air pressure and tamp cylinder air pressure
is at the Air Control Unit.
The Print Engine prints the labels and moves them to the tamp pad. Label Supply Hub is
where the label roll is placed. After the label is printed and distributed to the tamp pad the
carrier is taken up on the Label Rewind Hub.
PA/4000 AIR CYLINDER/TAMP ASSEMBLY
Air travels from a tube at the Air Control Unit to the Air Cylinder and is connected at the top to
provide the positive downward travel of the cylinder. Air also travels from the Air Control
Unit to the Air Cylinder and is connected at the bottom to provide the negative upward travel
of the cylinder. The Tamp Pad Assembly is a set of aluminum plates with a vacuum chamber
cut out of the top side of the bottom impact plate.
A gasket lies between the plates and screws hold the assembly together. A foam pad adheres to
the bottom of the impact plate to provide a cushion between the plates and the box during
impact. This foam pad has vacuum holes that are aligned with those on the impact plate to
allow for the suction needed to hold a label on the Tamp Pad Assembly.
The Tamp Pad Assembly is mounted to the Air Cylinder by an adapter plate and screws. After
receiving the label from the Print Engine, it is the Air Cylinder/Tamp Pad Assembly that
applies the label.