CRANK MECHANISM IN PARTICULAR FOR A WEIGHING SENSOR ON A BALANCE WORKING ON THE ELECTROMAGNETIC FORCE COMPENSATION PRINCIPLE

摘要

The invention relates to a crank mechanism, in particular, for a weighing sensor on a balance working on the electromagnetic force compensation principle, comprising at least one crank (23) connected to a fixed base body (3) or an element connected thereto, the at least one crank arm being connected to the base body (3) or the element connected thereto by means of an elastically-deformable joint (28), defining a pivot axis of the at least one crank (23) and a load force (FL) corresponding to the weight force (FG) or a derivative thereof acts on a first crank arm of the at least one crank which generates a reaction force (FR) on a second crank arm of the at least one crank. According to the invention, the elastically-deformable joint (28) comprises two thin elastically-deformable flexible regions (29), connecting the crank directly or indirectly to the base body (3) or the element connected thereto, each flexible region (29) being flexible in a direction perpendicular to a longitudinally extending plane defined by the geometry of the flexible region (29) to generate a pivot movement of the at least one crank (23), the longitudinally-extending planes of the flexible regions (29) including an angle (α) which is not zero and a virtual pivot axis (D) for the at least one crank (29) is defined by the two elastically-deformable flexible regions (29).