The document describes the Magnum, a fully automatic inline stencil printer capable of printing circuit boards from 50x50mm up to 1800x600mm. It has high print accuracy of ±15 microns and repeatability of ±10 microns. Key features include automatic conveyor and stencil width adjustment, an automatic under stencil cleaner, optional automatic paste dispensing, and optional 2D post-print inspection. The print carriage uses stepper motors and feedback to apply adjustable print pressures from 0.1-20kg and speeds from 5-250mm/s. It has a compact footprint for its size capabilities.

1. 1
MAGNUM

2. Key Points
• Fully automatic, versatile, inline stencil printer
– Can print PCBs from 50 x 50mm up to 1800 x
600mm
– Can accept a range of stencil sizes
• Highly accurate alignment system
• Print repeatability ±10 microns
• Print accuracy ±15 microns
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3. Print Profile
• Print pressures of 0.1 to 20kg
• Print speeds of 5-250 mm/s
• Real-time feedback on printing pressures
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4. Features
• Automatic conveyor width adjustment
• Automatic stencil width adjustment
• Automatic under stencil cleaner with wet, dry
and vacuum capabilities
• Automatic paste dispensing onto stencil
(optional)
• Post-print 2d inspection of PCB and stencil
(optional)
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5. Tried and Tested
• The Magnum uses sub-assemblies already in
use on other Reprint machinery already in
production
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6. Print Carriage
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Prints in X rather than in Y, allowing for standard
squeegees to be used

7. Print Carriage
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Other features:
• Driven by a stepper motor on a ball screw
mechanism
– Low maintenance
– Long life
– Safe. The motor cannot be damaged by
mechanical overload.
– Good low speed torque

8. Print Carriage
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Feedback:
• Feedback on squeegee pressure allows the
machine to adjust for changes over long print
strokes.
• Results can be plotted to graph and monitored
by the operator.
• Print speed can be programmed, profiled and
recorded.

9. Print Carriage
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Y adjustment
• Automatically centres squeegees above PCB
– Large PCB:

10. Print Carriage
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The front edge of the PCB is always in the same
place. The upper frame shifts to align with the
centre of the PCB
– Smaller PCB:

11. Print Carriage
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Stencil width adjustment:
• Print carriage moves stencil slides into position
where they are pneumatically clamped

12. Conveyors
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• Compatible with SMEMA and other FMI
protocols
• Fully programmable transport speeds and
direction

13. Conveyors
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Rail width adjustment
– Front rail fixed. Rear rail driven by a stepper motor
on a leadscrew mechanism.
– Independent buffer rails on both sides with
automatic width adjustment. Allows easy setup
and transport of PCBs along production line.

14. Conveyors
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Rail width adjustment

15. Conveyors
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• PCB transported on belts and clamped with thin foils
• When clamped the PCB is supported underneath by rigid steel
plates
• Rails sit directly on the surface of the table for reliable
stability

16. Table
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• Table is lifted to bring PCB to print height
• Rigid steel frame supports align table

17. Table
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• Lifted using a Maxon DC motor and two ball screws with worm drive
gearboxes. The gearboxes are able to hold the table in place without the
need of a brake.
• Align table sits on two linear bearings and a pivot rather than roller balls.
This reduces wear and gives a more solid platform.

18. Table
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• Align table is adjusted in X, Y and θ (theta) using three ball
screws and stepper motors. The distance between the
motors, and the use of microstepping, allows ultra-fine
position adjustment of the table.

19. Vision and Alignment System
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• Easy to use ‘point and click’ fiducial learning

20. Vision and Alignment System
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• Dual camera system with unique multi-coloured illumination
• Able to look at PCB and stencil simultaneously
• Positioned using linear encoders accurate to 1µm

21. Vision and Alignment System
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• Alignment system can use up to five fiducial
sites
• Alignment system can detect and average out
differences between the PCB and stencil.

22. Vision and Alignment System
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• 2d inspection can check blockages in stencil apertures and
coverage of pads:

23. Vision and Alignment System
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• 2d inspection in use…

24. Under Stencil Cleaner
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• Available with 3 different modes – dry, wet & vacuum
• Custom cleaning profiles can be created using a mixture of
different cleaning modes
• Cassette style assembly, allowing for easy paper roll change
over.

25. Automatic Paste Dispense
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• Uses 2 12oz canisters, lengthening the time between required
canister changeovers.
• Fully programmable.

26. Footprint
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• The Magnum has a relatively small foot print for a printer
capable of printing PCBs as large as 1,800 x 600mm