Abstract A device for connecting the balance wheel of a sewing machine with the main shaft in which a metallic disc within a cylindrical-surface of the balance wheel is rigidly connected with the main shaft, a U-shaped flexible element connected in its lower part with said disc, a U-shaped spring within the flexible element and secured thereto by two tongues engaging two slots on the upper end of the arms of the flexible element and an elliptically shaped cam inside the flexible element and spring so that in one position the cam forces the arms against the cylindrical surface of the balance wheel thereby engaging the main shaft with the balance wheel and in the other position the arms are spaced from the cylindrical surface of the balance wheel as a result of the action of the spring so that the main shaft is disengaged from the balance wheel. The positions of the cam are delimited by the opposite ends of a circumferential groove on the disc and engaged by a tooth provided on the front part of the cam.
A device for connecting the balance wheel with the main shaft in sewing machines, comprising a metallic disc within the balance wheel rigidly connected with the main shaft, a U-shaped flexible element, connected in its lower part with said disc, and an elliptically shaped cam placed inside said element and capable of assuming a position in which the ''''U'''' shaped element are forced against a cylindrical surface of said balance wheel freely rotatable on said main shaft, and another position in which the two arms of the U-shaped element separate from the cylindrical surface of the balance wheel, and return to their positions of rest by their own elasticity combined with the action of a return spring, said cam being free to rotate but not to move axially with respect to the shaft, the two positions of the cam being delimited by the opposite ends of a circumferential groove on said disc and engaged by a tooth provided on the front part of said cam.
Claim 2
Independent Claim
165 words
A device for connecting the balance wheel with the main shaft in sewing machines, comprising a metallic disc within the balance wheel rigidly connected with the main shaft, a U-shaped flexible element, connected in its lower part with said disc, and an elliptically shaped cam placed inside said element and capable of assuming a position in which the ''''U'''' shaped element are forced against a cylindrical surface of said balance wheel freely rotatable on said main shaft, and another position in which the two arms of the U-shaped element separate from the cylindrical surface of the balance wheel, and return to their positions of rest by their own elasticity combined with the action of a return spring, said cam being free to rotate but not to move axially with respect to the shaft, the two positions of the cam being delimited by the opposite ends of a circumferential groove on said disc and engaged by a tooth provided on the front part of said cam.