Abstract: The present invention is a horizontal rotary hook for a sewing machine includes an inner bobbin case holder, an outer rotating hook made of a synthetic resin, a sliding surface formed on the rotating hook so as to be slid relative to the bobbin case holder with rotation of the rotating hook while an outer periphery of the bobbin case holder is placed on the rotating hook, an opening defined in an outer peripheral wall of the rotating hook so that a needle thread passes through the opening, and a beak mounted on an outer peripheral wall of the rotating hook for seizing a loop of the needle thread.

Abstract: A horizontal rotary hook for a sewing machine includes a bobbin case holder accommodating a bobbin, a rotating hook made of a synthetic resin, and accommodating the bobbin case holder and rotated in a predetermined direction, the rotating hook including a peripheral wall and a peripheral end, a needle-thread passing opening formed in the peripheral wall of the rotating hook so as to be defined at least by a peripheral end of the peripheral wall, and a reinforcing rib provided on the peripheral wall of the rotating hook so as to be located in the vicinity of the peripheral end defining the needle-thread passing opening.

Abstract: The present invention is a horizontal rotary hook for a sewing machine includes an inner bobbin case holder, an outer rotating hook made of a synthetic resin, a sliding surface formed on the rotating hock so as to be slid relative to the bobbin case holder with rotation of the rotating hook while an outer periphery of the bobbin case holder is placed on the rotating hook, an opening defined in an outer peripheral wall of the rotating hook so that a needle thread passes through the opening, and a beak mounted on an outer peripheral wall of the rotating hook for seizing a loop of the needle thread.

Abstract: A rotary shuttle device for a sewing machine, including an outer shuttle having a main body integrally provided with a base portion disposed at the driving shaft, a first supporting portion protruding from one side of the base portion to have a first partial track groove on an inner face thereof, and a second supporting portion protruding from the other side of the base portion opposite to the first supporting portion and having a second partial track groove on an inner face thereof; a track groove member is removably disposed between the first and second supporting portion and has a third partial track groove communicated with the first partial track groove of the first supporting portion and the second partial track groove of the second supporting portion; and a groove member is removably fixed to the second supporting portion of the main body.

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 rotary loop taker for a lock-stitch sewing machine having a detachable loop seizing point and detachable raceway-defining portion. The inwardly facing vertical wall in the middle and final portions of the bobbin case raceway is defined by a replaceable member that in all cases is formed separately from the annular frame. The lower ledge in the middle and final portions of the raceway is defined by a member that may be formed separately from the annular frame, or may be formed integrally with the frame. In the preferred embodiments of the rotary loop taker, the two members referred to may both be formed integrally with the detachable loop seizing point, or only the member that defines the vertical wall may be formed integrally with the loop seizing point. If desired, neither of the two members mentioned may be formed integrally with the detachable loop seizing point.

Abstract: A horizontal rotary hook has an outer rotating hook body provided with a mounting protrusion protruding from the outer circumference of the side wall thereof and provided with an upper mounting surface and a side mounting surface. A thread catching member is placed movably on the upper mounting surface of the mounting protrusion, the horizontal position of the thread catching member relative to the axis of the outer rotating hook body is determined by using a positioning jig, and then the thread catching member is fixed to the mounting protrusion of the outer rotating hook body by welding. A loop expanding member is joined to the thread catching member so as to stand perpendicularly to the upper surface of the thread catching member and a part of the loop expanding member is fixed to the side mounting surface of the mounting protrusion by welding.

Abstract: A front section of a hook point member, relative to a rotating direction, of a rotating hook assembly is replaceable. The member can be replaced with a new one when a hook point is worn. Also, the replaceable member is made of a material of high hardness, such that burr-like edges will not be formed, thereby making it possible to obtain good sewing performance for a long period of time. The hook point and a claw may be formed integrally and can be replaced when the hook point and/or the claw is worn.

Abstract: A fully rotating hook includes an inner bobbin case, an outer loop taker mounted about the bobbin case, the loop taker having a track groove formed therein, a rotating member for rotating the loop taker such that relative rotation occurs between the loop taker and the bobbin case, and a stopper member for preventing rotation of the bobbin case with the loop taker while the loop taker is rotating. The track groove of the loop taker is formed by at least one wall therein which is coated with a layer of synthetic resin material having a small coefficient of friction to reduce friction between a track projection member on the bobbin case and the track groove of the loop taker.

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 thread loop taker device for a zigzag sewing machine having a needle whose position is controlled by electronically stored data which cooperates with the thread loop taker device to thereby produce zigzag stitches. The thread loop taker device comprises a bobbin carrier, a rotational cylindrical member for supporting the bobbin carrier therein; a loop taker coaxial with and about the cylindrical member for rotation therewith, the loop taker having a beak extending from one end and in the direction of the rotation around a portion of the cylindrical member for catching a thread loop formed by the needle; cams rotating with the cylindrical member and engaging the opposite end of the loop taker for rotating the beak relative to the cylindrical member; and a pulse motor drivable in response to a change in the position of the needle so that, when this driving is transmitted to move the cams, the loop taker is actuated.

Abstract: A thread loop taker device for a zigzag sewing machine having a needle whose position is controlled by electronically stored data which cooperates with the thread loop taker device to thereby produce zigzag stitches. The thread loop taker device comprises a bobbin carrier, a rotational cylindrical member for supporting the bobbin carrier therein; a loop taker coaxial with and about the cylindrical member for rotation therewith, the loop taker having a beak extending from one end and in the direction of the rotation around a portion of the cylindrical member for catching a thread loop formed by the needle; cams rotating with the cylindrical member and engaging the opposite end of the loop taker for rotating the beak relative to the cylindrical member; and a pulse motor movable in two opposite directions in response to a change in the position of the needle so that, when this movement is transmitted to the cams, the loop taker is actuated.

Abstract: A loop taker (18) has a loop taker body (20) molded of resin in one piece, and a hook (22) made of metal. A rotary shaft (13) is fitted in the center of the loop taker (18), and a set screw (17) threadedly inserted in the end of this rotary shaft holds down the loop taker (18). A pin (36) fixedly installed on the rotary shaft (13) is fitted in a radially extending groove (37) in the loop taker (18), whereby the loop taker (18) is connected to the rotary shaft (13) so that it will not rotate relative to the rotary shaft.

Abstract: A loop taker (18) has a loop taker body (20) molded of resin in one piece, and a hook (22) made of metal. A rotary shaft (13) is fitted in the center of the loop taker (18), and a set screw (17) threadedly inserted in the end of this rotary shaft holds down the loop taker (18). A pin (36) fixedly installed on the rotary shaft (13) is fitted in a radially extending groove (37) in the loop taker (18), whereby the loop taker (18) is connected to the rotary shaft (13) so that it will not rotate relative to the rotary shaft.

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.

Abstract: A sewing machine loop taker is disclosed having a replaceable adjustable hook beak and needle guard fabricated as a integral element in which the dimensional relationships established in fabrication are not influenced by the means for securing or the provisions for adjustment of the element relatively to the loop taker.

Abstract: A loop taker mechanism and bobbin carrier for a sewing machine in which the bobbin carrier is formed of three components and is journalled in a rotary hook casing. An oscillating escapement yoke has two spaced beaks which cooperate with abutment faces on the carrier to prevent the carrier from rotating. One of the beaks carries an over-hanging guide plate which is wider than the beak and serves to prevent a thread loop from moving behind the beak and fouling the operation of the machine.