EP 0114914 B1 19870422 - DEVICE FOR DETECTING AND EVALUATING COLOUR CONTROL STRIPS ON A PRINTING SHEET
Title (en)
DEVICE FOR DETECTING AND EVALUATING COLOUR CONTROL STRIPS ON A PRINTING SHEET
Publication
Application
Priority
EP 83100841 A 19830129
Abstract (en)
[origin: US4648048A] An apparatus to obtain ink density data by scanning color measurement strips on a printed sheet has a densitometer mounted on a digitally-driven X,Y positioning mechanism, an optical sensor for detecting the position and orientation of the sheet with respect to the X,Y positioning mechanism, and a numerical computer for transforming the sheet coordinates of the color measurement strips to the X,Y coordinates of the X,Y positioning mechanism. Thus, the numerical computer can automatically position the densitometer to scan the color measurement strips. In a first embodiment, optical sensor arrays determine the position and orientation of the test sheet with respect to the X,Y positioning mechanism. In a second embodiment, the densitometer itself scans the edge portions of the test sheet to determine the position and orientation of the test sheet. The operator has the option of using sheet coordinates of the color measurement strips obtained from non-volatile storage, from a recording medium such as magnetic tape or disk, from direct operator entry from a keyboard, or from the sighting of the measurement strips on the test sheet arbitrarily positioned and oriented with respect to the X,Y positioning mechanism.
IPC 1-7
IPC 8 full level
G01B 11/00 (2006.01); B41F 31/02 (2006.01); B41F 33/00 (2006.01); G01B 11/03 (2006.01); G01B 21/00 (2006.01); G01N 21/17 (2006.01); G01N 21/47 (2006.01)
CPC (source: EP US)
B41F 33/0036 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0114914 A1 19840808; EP 0114914 B1 19870422; AT E26674 T1 19870515; JP H0426044 B2 19920506; JP S59155710 A 19840904; US 4648048 A 19870303
DOCDB simple family (application)
EP 83100841 A 19830129; AT 83100841 T 19830129; JP 21109983 A 19831111; US 57487584 A 19840130