Shedding mechanism and jacquard-type weaving loom equipped with such a mechanism

A shedding mechanism on a Jacquard-type weaving loom, this mechanism comprising a housing extending according to a longitudinal direction, at least one movable hook, moved in the housing by a knife according to a longitudinal direction between a bottom dead center position and a top dead center position, in or near which the hook can be retained by a selection device which comprises at least

• an electromagnet which is mounted and fixed in the housing, and which includes
• a ferromagnetic core comprising a first pole face and a second pole face, these pole faces being offset from each other according to the longitudinal direction, and
• a non-magnetic portion integral with the ferromagnetic core
• a retaining lever configured to retain the movable hook when this is in or near its top dead center position, the retaining lever being pivotally mounted about an oscillation axis between a position remote from the electromagnet and a position in contact with the electromagnet, and comprising a ferromagnetic armature that magnetically interacts with the first and second pole faces to control the angular position of the retaining lever about the oscillation axis
• wherein
• the non-magnetic portion of the electromagnet comprises a guide surface for the pivotal movement of the retaining lever about the oscillation axis, this guide surface cooperating with the retaining lever in a direction radial to the oscillation axis between the remote position and the contact position, and
• the guide surface is cylindrical with a circular base, centered on the oscillation axis.