Mechanism for obtaining a closed path of a desired form

Abstract

Abstract 1. Mechanism intended for moving in repetitive manner a work member in an L-motion and of the type having four bars (1 to 4), i.e. comprising three bodies (1, 2, 3) arranged so that the intermediate body (2) is pivoted on each of the two end bodies whilst each of them may rotate about a fixed pivot (5, 8) which is associated therewith, one of said end bodies being rotated about its fixed pivot axis to be the motor of the other two bodies, at least one of the points of the intermediate body describing a closed trajectory whose shape is at least roughly similar to the shape of a desired trajectory, and the normally circular trajectory of at least one of the two pivots of the intermediate body being corrected to lead the trajectory described by said point of the intermediate body to be at least substantially identical to the desired trajectory, characterised in that the driving end body (1') is comparable to a rod of variable length, whose length is determined for each angle of rotation so that one of its ends describes the adequate corrected circular trajectory, in that the intermediate body (2') is comparable to a first deformable parallelogram (B1 M1 B2 M2 ) of which a first side (B1 M1 ) is fast with a rod (B1 C1 ) pivoted on the drive body (1') and of which a second side (M1 M2 ) contiguous to said first side (B1 M1 ) comprises the point (M) which describes the desired trajectory, in that the other end body (3') is comparable to a second deformable parallelogram (A3 B3 A4 B4 ) comprising two fixed pivots (A3 A4 ), and in that the two deformable parallelograms (B1 M1 B2 M2 and A3 B3 A4 B4 ) are pivoted on each other via four pivot points (B1 B2 B3 B4 ) disposed at the apices of a third parallelogram of which the diagnolas are respectively formed by the side (B1 B2 ) of the first parallelogram (B1 M1 B2 M2 ) opposite said second side M1 M2 and by the side (B3 B4 ) of the second parallelogram opposite the two fixed pivots (A3 A4 ).

Inventors

• 👤 André Blum

Bibliographic Details