Abstract: A bobbin case wherein a cylindrical wall which surrounds the thread bobbin supports an externally mounted spring having a pan-shaped portion for a disc-shaped thread tensioning member provided with a flat thread-contacting surface which confronts a complementary portion of the external surface of the cylindrical wall. The bias of the spring upon the tensioning member, and hence the force with which the surface of the tensioning member urges the thread against the adjacent portion of the external surface of the cylindrical wall, is adjustable by a screw. The tensioning member is tiltably installed in the pan-shaped portion of the spring so as to adjust its inclination relative to the adjacent portion of the external surface of the cylindrical wall in dependency on the position of the thread.

Abstract: The presser-foot of the fabric presser device in a sewing machine is pivotable about an axis of a presser-bar in order to provide space in the stitching region of a needle in order to allow manipulations to be made to the needle. The fabric presser device is constructed such that the presser-foot can be pivoted or swung away from the region of the needle only when the needle and the presser-bar are in a raised or elevated position.

Abstract: A self-sustaining bobbin winding device for use in a sewing machine has a driving unit which carries the bobbin during winding of a thread onto its core, and such unit is driven by an electric motor which can be arrested in response to actuating of an electric switch. The switch is actuated by one arm of a three-armed lever another arm of which is caused to bear against the roll of convoluted thread on the rotating bobbin and initiates a stoppage of the motor when the bobbin has collected a preselected length of thread. The third arm of the lever can be depressed by hand to disengage the other arm from the convoluted thread and to actuate the switch at the will of the operator. A first thread cutting tool is provided on the third arm of the lever, and a second thread cutting tool is provided on the driving unit.