265ProFlow - 第26页
TECHNIC AL RE FERENCE MECHANICAL DETAIL 1.22 ProFlow Manual Chapter Issue 8 Dec 02 Downstop The downstop appl ies to GSX, Lt and Infi nity machines only . The purpos e of the downstop is to provide ProFlow wit h a zer o …
TECHNICAL REFERENCE
MECHANICAL DETAIL
Chapter Issue 8 Dec 02 ProFlow Manual 1.21
Pneumatic Gun The pneumatic gun is an optional accessory for the rechargeable transfer head.
The gun, supplied with a holster, is fitted to the machine and is pneumatically
connected to the factory air supply. The gun enables ready access and use for
regular charging of the ProFlow unit.
Figure 1-15 Pneumatic Gun (optional)
NOTE
For detailed procedures of print material filling refer to the Consumable Replen-
ishments chapter of the machine manual or the ProFlow Best Working Practices
guide (DEK Part No. 171280).
TECHNICAL REFERENCE
MECHANICAL DETAIL
1.22 ProFlow Manual Chapter Issue 8 Dec 02
Downstop The downstop applies to GSX, Lt and Infinity machines only. The purpose of
the downstop is to provide ProFlow with a zero pressure datum when ProFlow
is at contact height with the screen.
Downstop Position This is the position where the downstop is pre-tensioning the squeegee suspen-
sion and compression springs. A software offset can be implemented to +/-
10mm from the squeegee reference position.
Figure 1-16 Downstop Shown in Downstop Position
As the squeegee mechanism is mounted on a both positive and negative sprung
suspension system, any force exerted by the squeegee motor (relative to a fixed
position, ie the stencil), creates a damping force, causing the squeegee mount-
ing to move as it exceeds the sprung force.
The ProFlow downstop is fitted to the front squeegee mounting and drives
against the print carriage, compressing the main spring. This causes the
squeegee mechanism to be lifted relative to the print carriage, pre-loading the
system’s main compression spring and effecting a ‘solid’ platform for the
ProFlow to work from.
Side View of Squeegee Mounting Assembly
Front Squeegee Mount
Lowered Downstop in
Contact with Print
Carriage
Squeegee Mechanism
Pre-tensioned to Full
Extent
Print Carriage
Compression Spring
Suspension Spring
TECHNICAL REFERENCE
MECHANICAL DETAIL
Chapter Issue 8 Dec 02 ProFlow Manual 1.23
Pneumatic Supply The pneumatic air supply offers a positive force to the ProFlow system during
the print cycle providing a continuous supply of print material to the stencil.
NOTE
This force should not be confused with system pressure which is the force
applied to the ProFlow unit by the printhead mechanism stepper motor.
Software Control System air pressure is applied to the piston crosshead enabling the pressure
actuators. ProFlow pressure is factory set at 2.0 bar, however this can be
adjusted under edit data.
The Idle Paste Pressure parameter applies a light pressure onto the piston
crosshead and print material system whilst the ProFlow unit is idle, but remain-
ing on the stencil surface. (Refer to Adjustments and Settings - Software
Pressure Adjustment Section of this chapter for further details.)
An SMC SCAR is used on GSX and Lt machines and a Norgren SCAR on all
other machines.
Figure 1-17 Software Controlled Pressure Mechanism - SMC