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10 Machine Modules 10.2 Under Screen Cleaner 98 Technical Training E by DEK 12/2017 10.2.1.2 Overview Interchangeable Under Screen Cleaner Electrical System Electrical Overview 10.2.2 Parts exchange / Settings / Calibrat…
10 Machine Modules
10.2 Under Screen Cleaner
Technical Training E by DEK 12/2017 97
10.2.1.1 Interchangeable Under Screen Cleaner Functionality
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The under screen cleaner wipes lint free paper, dry or wet across the underside of the screen
to minimize paste build up. The frequency and mode (wet/dry/vac) is programmable
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The paper rolls are available in 300, 400, 520 widths
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When a screen cleaner is required, the camera carriage approaches the cleaner and attaches
to the cleaner using two permanent magnets. The two electromagnetic clamps holding the
screen cleaner unit in the home position are de-energized allowing the camera carriage to
control the cleaner.
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The paper feed motor supplies a clean section of paper across the two rubber wiper blades of
the squeegee assembly. During a ‘Wet’ clean, a solvent pump dispenses solvent through the
solvent spray bar, wetting the width of the paper just behind the squeegee assembly. The
squeegee assembly is lifted (engaging the cleaner with the underside of the screen) and the
camera carriage pulls the cleaner across the underside of the screen, removing any surplus
print material.
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The two wiper blades form the mouth of the vacuum cleaner.
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A paper usage sensor enables the software to monitor the paper roll usage. ‘Time To Go’ is
disabled, software monitors the pulses from the sensor and if no pulses are detected during
paper advance, it is assumed that the paper roll is empty and displays an “Roll Empty error
message
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The solvent pump supplies solvent to the paper roll from the external solvent tank, mounted
on the rear or either side of the machine.
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The external solvent tank container is capable of accommodating a 5 litre container of solvent.
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A load cell in the base of the external solvent tank enables the software to calculate the
percentage level of solvent within the container.
Solvent
ASM only recommend the DEK-PRO and the DEK-PRO XF (Environmentally Friendly) USC
solutions to be used with the under screen cleaner. The following are available from ASM:
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DEK-PRO
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DEK-PRO XF
They are available in 1;5;20 litre containers.
Vacuum Filtration
The vacuum filtration unit extracts solvent fumes and draws excess print material onto the paper:
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Inbuilt Vacuum Filtration Unit
10 Machine Modules
10.2 Under Screen Cleaner
98 Technical Training E by DEK 12/2017
10.2.1.2 Overview Interchangeable Under Screen Cleaner Electrical System
Electrical Overview
10.2.2 Parts exchange / Settings / Calibration
Parts exchange Tools / Setting Calibration
Solvent Load Cell - Solvent full / empty calibration
Solvent Level Amp - Solvent full / empty calibration
Detail instruction in technical reference manual.
10 Machine Modules
10.2 Under Screen Cleaner
Technical Training E by DEK 12/2017 99
10.2.3 Analysis Common error list
Fig.8: Diagnose Blue Cleaner
Error Description Possible Cause Action
Cleaner unit not correctly
“picked Up”
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Mechanical problem
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Electrical or control problem
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Calibration required
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Check Reference point
Camera
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Check Home Magnets
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Check Parallelism
Cleaner / Camera axes
Home Position not found Play or difficulty with the Stencil
loading
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Check home sensor
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Check home magnet
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Check Parallelism
Poor Cleaning results
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Too much liquid
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Too little cleaning liquid
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Non consistent cleaning ( left
side cleaner that right)
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Check that the required
amount of cleaning liquid is
used in the cleaning cycle
(settings, pump, air in
system)
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Check Parallelism
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Check distance to Stencil
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Check paper quality
10.2.4 Maintenance
Maintenance tasks (Details instruction in reference manual).
Maintenance content Interval Requirement
Check cleaning functionality (all parts) monthly
Filter (225093) yearly