Patent ID: 7637290

Claim:
Control device ( 53 ) for a shift clutch ( 11 ) of a dobby, comprising: a carrier ( 24 ), a selecting finger ( 28 ) that is supported on the carrier ( 24 ) so as to be pivotable about a pivot center ( 32 ) and contains a magnetically conductive armature ( 47 ), an electromagnet ( 37 ) that is statically supported on the carrier ( 24 ) and has a core ( 41 ) with two poles ( 45 , 46 ), wherein the first pole ( 45 ), together with the armature ( 47 ), defines a first air gap ( 48 ), said air gap being curved in the form of a circular arc having a constant radius (R) relative to the pivot center ( 32 ), and wherein the second pole ( 46 ), together with the armature ( 47 ), defines a second air gap ( 49 ), said air gap having a size that is a function of the pivoting movement of the selecting finger ( 28 ).