03217917-01-01E By DEK Technical Reference Manual Vol 1_enPDFA - 第185页
14 SCREEN ALIGNMENT MODULE 14.1 OVERVIEW TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019 185 14 SCREEN ALIGNMENT MODULE 14.1 OVERVIEW 1 2 2 1 9 8 7 6 5 2 4 3 2 A A View on Arrow 5 Left Hand Printhead Assembly 1 Chase C…
13 ADJUSTABLE WIDTH STENCIL MOUNT
13.3 CALIBRATIONS
184 TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019
14 SCREEN ALIGNMENT MODULE
14.1 OVERVIEW
TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019 185
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SCREEN ALIGNMENT MODULE
14.1 OVERVIEW
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A
A View on Arrow 5 Left Hand Printhead Assembly
1 Chase Clamp (2 positions) 6 Chase Clamp Regulator
2 Roller Counter Plate (4 positions) 7 Y Actuator
3 X Front Actuator 8 AWSM
4 X Rear Actuator 9 Right Hand Printhead Assembly
The screen alignment system is one of the most sensitive and critical components of machine ac-
curacy. The alignment system consists of three stepper motor driven linear actuators in contact
with the chase (adjustable screen mount) which is a free floating mechanism sprung against the
three actuators. The actuators are configured in a three point contact arrangement and are con-
trolled and driven independently to give maximum flexibility in stencil movement.
14 SCREEN ALIGNMENT MODULE
14.1 OVERVIEW
186 TECHNICAL REFERENCE MANUAL Vol 1 E By DEK 04/2019
The stencil is aligned to the board on each machine cycle unless non-vision is selected. An al-
gorithm determined by image capture is calculated in software, this sets the direction and distance
that each actuator must move to align the stencil to the board. Once correctly aligned the chase is
clamped by two pneumatic chase clamps, to the left and right printhead assemblies, so that the
alignment is maintained throughout the rest of the print cycle.
A spring fitted between the actuator and the chase provides an anti-backlash mechanism to ensure
accurate positioning is always achieved.
All positioning of the screen actuators is referenced from the home position and calculated in the
machine software. The screen actuators only home during initialisation, which can be from power-
up or exiting diagnostics. When homed the stepper motor retracts the actuator plunger until the mo-
tor stalls. The stepper motor reverses direction and drives the actuator plunger out 20mm.
For information on the chase clamp solenoid and the chase clamp regulator refer to the Pneumat-
ics Chapter in Volume 2 of this manual.