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TECHNIC AL RE FERENCE MODULE OVER VIEW 1.2 ProFlow Manual Chapter Issue 8 Dec 02 The main compone nts of each unit consi st of t he fol lowing: Pressure Mechanism • Pneumatic Actuat ors, (2 positi ons) • Soft ware Contro…
TECHNICAL REFERENCE
MODULE OVERVIEW
Chapter Issue 8 Dec 02 ProFlow Manual 1.1
CHAPTER 1 TECHNICAL REFERENCE
MODULE OVERVIEW
Purpose The purpose of ProFlow is to apply printable material directly onto the stencil
alleviating the need for squeegees and a paste dispenser. This system is
derived from the material transfer technology DirEKt Imaging.
The ProFlow system is an optional replacement to the squeegee and paste
dispenser systems.
ProFlow is a self contained unit with the following advantages:
• Fully sealed unit keeping the printable material in optimum condition.
• Cassette option easily changed for replacement units.
• Rechargeable unit option.
• Retention system keeping stencil surfaces clean.
• Reduction in printable material wastage.
• Reduction in under screen cleaner paper and solvent usage.
Elements The main units of ProFlow comprise:
• ProFlow Printhead Mechanism
• ProFlow Pressure Mechanism
• ProFlow Transfer Head
• ProFlow Downstop (not fitted to fixed head machines)
Figure 1-1 ProFlow Fitted to an Infinity Machine
TECHNICAL REFERENCE
MODULE OVERVIEW
1.2 ProFlow Manual Chapter Issue 8 Dec 02
The main components of each unit consist of the following:
Pressure
Mechanism
• Pneumatic Actuators, (2 positions)
• Software Controlled Air Regulator - SCAR
• Cassette Low Sensor
• Piston Crosshead
Transfer Head • Conditioning Chamber (single or dual chamber)
• Cassette Carrier or Rechargeable Unit Option
• Cassette (optional)
• Retention System
Configuration The following optional configurations of ProFlow are available for use on this
machine:
Cassette The ProFlow cassette is available in 300mm size only (capacity approximately
800g - 850g solder paste).
Transfer Head The table below lists the types of optional transfer head units, and sizes
available, for use with ProFlow.
NOTE
All of the above cassette transfer heads are fitted with the standard 300mm
cassette and 300mm piston crosshead. A dedicated piston crosshead is
required for each rechargeable transfer head size.
Transfer Head Type
Transfer Head Sizes ( mm)
150 300 350 400 450 500
Cassette Type (single conditioning chamber)
Cassette Type (dual conditioning chamber)
Rechargeable Type (single conditioning chamber)
Rechargeable Type (dual conditioning chamber)
TECHNICAL REFERENCE
MODULE OVERVIEW
Chapter Issue 8 Dec 02 ProFlow Manual 1.3
Operation ProFlow operates in the Y and Z axes (horizontal and vertical planes).
The unit is raised and lowered to the screen by means of the rear squeegee
stepper motor, or for fixed head machines, the special ProFlow printhead
mechanism.
A downward force is applied to the ProFlow transfer head directly onto the
stencil which provides:
• A Positive seal between the transfer head and stencil eliminating leakage
above the stencil.
• Improved gasketing effect to give the best possible seal between stencil
and board.
The horizontal movement, driven by the machine print carriage motor, moves
the unit across the stencil in a forward and reverse direction (Y axis). A print
cycle may consist of a single movement in the Y axis, (forward or backwards).
Paste pressure (pneumatic pressure), is applied to the piston crosshead exert-
ing a force onto the print material which, in turn, forces print material into the
ProFlow conditioning chamber and into the stencil apertures.
As the unit moves across the stencil, the trailing wiper within the transfer head,
lifts the print material from the screen surface creating a rolling movement of
material within the conditioning chamber. The volume of material, under
pressure from the piston crosshead, is kept at a constant level within the
chamber.
Figure 1-2 ProFlow Cross Section (with Cassette Option)
ProFlow Pressure
Mechanism
Transfer
Head
Stencil
Board
ProFlow Movement (Y Axis)
Wiper
Piston
Crosshead
Pneumatic
Pressure
System Pressure
Print Material
Side Chambers
Cassette
Nozzle
Cassette
Plunger