PRINT HEAD FRAME STRUCTURE AND CONTROL

The invention relates to a print system comprising at least two page-wide arrays of ink jet print heads, positioned in a frame (40) over a conveyor belt (25) for transporting a substrate (20) underneath the arrays, three sensors (41, 42, 43) for reading markers on the conveyor belt and a control uni...

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Bibliographic Details
Main Authors KOEKEBAKKER, Sjirk H, RIETBERGEN, Mark, SMITS, Johan P
Format Patent
LanguageEnglish
French
German
Published 16.11.2022
Subjects
ALLOYS
CHEMISTRY
CORRECTION OF TYPOGRAPHICAL ERRORS
FERROUS OR NON-FERROUS ALLOYS
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
LINING MACHINES
METALLURGY
PERFORMING OPERATIONS
PRINTING
SELECTIVE PRINTING MECHANISMS
STAMPS
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
TYPEWRITERS
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Summary:The invention relates to a print system comprising at least two page-wide arrays of ink jet print heads, positioned in a frame (40) over a conveyor belt (25) for transporting a substrate (20) underneath the arrays, three sensors (41, 42, 43) for reading markers on the conveyor belt and a control unit (50) that is configured to derive control signals from encoder signals of the three sensors. Two sensors (41, 42) are directly connected to the frame and a third sensor (43) is connected to one of the said two sensors by an element with virtually no thermal expansion, extending in transport direction. The control signals, comprising signals for controlling a transport speed of the conveyor belt and line pulses for the at least two print heads, are derived in such a way that an amount of thermal expansion of the frame is determined and an absolute print resolution is maintained.
Bibliography:Application Number: EP20210173166