Abstract: A rotary loop taker is provided having a frame with a rotational axis and including an annular part and a support extending radially from the rotational axis to the annular frame part. A loop seizing point is removably maintained in an operative position on the frame through a fixed projection on one of the loop seizing point and annular part of the frame, a first receptacle for the first projection on the other of the loop seizing point and annular part of the frame, a second fixed projection on one of the loop seizing point and annular part of the frame, and a second receptacle for the second projection on one of the loop seizing point and annular part of the frame.

Abstract: A bobbin basket for use with a rotary loop-taker in a lock-stitch sewing machine is disclosed. The basket is integrally formed of plastic, with damage resistant members for reducing wear and impact damage at specified locations. The extent of each such location may be only a small fraction of the potential area of wear and damage. Inserts are disclosed for the needle thread stop, the needle thread pick-up notch, the upstream side wall of a rotation-restraining notch, the bearing rib, and the downstream side wall of the rotation-restraining notch.

Abstract: A composite rotary loop taker which includes a loop seizing point mounted on a substantially annular frame, for use in a lock-stitch sewing machine. The loop seizing point forms a smoothly curved junction with the leading edge of a crosswise member between the opposite sides of a rotatably mounted substantially annular frame, said smoothly curved junction adapted to receive a thread loop and expand the loop over a stationary bobbin basket to form a lock stitch. Preferably, the loop seizing point, downwardly extending lug toward the smoothly curved junction and an inwardly extending foot therefrom are metal, together with a crosswise reinforcing member and a partially circumferential supporting wall on the opposite side of the annular frame.

Abstract: A horizontal lock-stitch bobbin basket includes a cylindrical side wall, a laterally extending flange formed at the top of the side wall, and a rotation restraining notch formed in the top face of the flange. An elongated bore is defined by the side wall adjacent the restraining notch to provide for needle clearance. The bobbin basket is made of plastic and includes a needle guarding member the (1) protects the area of the bobbin basket adjacent to the bore from being accidentally damaged by the needle of a sewing machine, and (2) deflects the needle into the elongated bore.

Abstract: A rotary loop taker which includes a replaceable loop seizing point mounted on a substantially annular frame, for use in a lock-stitch sewing machine. The loop seizing point has a supporting lug that extends downwardly from immediately behind the base portion of the tapered forward end of the loop seizing point. The supporting lug forms a smoothly curved junction with the base portion of the tapered forward end of the loop seizing point. The rearwardmost position on the smoothly curved junction to which said needle thread loop is pulled by the rotating loop taker lies a first distance from the nearest point on the crack formed by the supporting lug and the wall of the annular frame against which the lug abuts that is sufficient to produce a second distance measured normal to the taut needle thread loop that will avoid snagging the needle thread in the crack just referred to during operation of the sewing machine.

Abstract: A rotary loop taker, for use in a lock-stitch sewing machine, which has a detachable and replaceable hook or loop seizing point. A lug extending downwardly from the main body of the replaceable loop seizing point abuts one end wall of a cut-away portion of the annular frame of the rotary loop taker, and carries a foot that extends inwardly from the annular frame toward the rotatable shaft of the device. The inwardly extending lug foot desirably nests in a notch in the crosswise support member on which the annular frame of the rotary loop taker rests, preferably forming a snug fit with the upper surface of the crosswise support member. The preferable form and dimensions of the loop seizing point and the foot extending inwardly from the downwardly extending lug are disclosed. Ledges formed in the inner wall of the replaceable loop seizing point define the initial portion of the raceway for the bobbin case with which the rotary loop taker is used.