SHEET EDGE DETECTION DURING UNINTERRUPTED TRANSPORT

A sheet edge detection device (20) wherein the signal threshold may be calibrated without interrupting the sheet transport. A detector unit (30) comprising a detector (31) and an emitter (32) emitting at a constant intensity generates signal data as a sheet (S) is transported along the detector (31)...

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Bibliographic Details
Main Author JANSSEN, Cornelius M.F
Format Patent
LanguageEnglish
French
German
Published 19.09.2018
Subjects
CONVEYING
CORRECTION OF TYPOGRAPHICAL ERRORS
HANDLING THIN OR FILAMENTARY MATERIAL
HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
LINING MACHINES
PACKING
PERFORMING OPERATIONS
PRINTING
SELECTIVE PRINTING MECHANISMS
STAMPS
STORING
TRANSPORTING
TYPEWRITERS
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Summary:A sheet edge detection device (20) wherein the signal threshold may be calibrated without interrupting the sheet transport. A detector unit (30) comprising a detector (31) and an emitter (32) emitting at a constant intensity generates signal data as a sheet (S) is transported along the detector (31). While the sheet (S) travels further on a calibration transport path section (CS), a processor (40) processes the signal data to calibrate the signal threshold by deriving a first signal level corresponding to a state wherein no sheet (S) is present between the detector unit (30) and by deriving a second signal level corresponding to a state wherein a sheet (S) covers the detector (31). From said signal levels the signal threshold is derived. This signal threshold is then compared to delayed signal data to determine the position of a point on a sheet edge of the sheet (S) before said sheet (S) reaches the upstream end of the calibration transport section (CS).
Bibliography:Application Number: EP20180161203