Abstract: A sewing thread (20) can be captured certainly with a thread capturing open eye (13a) of an open eye needle (13) and the stitches are formed in the inner space of a sewing machine bed (3). A handstitch and a locked stitch are formed, respectively, on the front surface and the back surface of a fabric workpiece (21) as a skip stitch set through cooperation of the open eye needle (13), a shuttle hook (200) and a thread draw out actuator (401). A feed dog (601) feeds the fabric workpiece by a stitch length (P1) for handstitch during a first stroke of the open eye needle (13), and feeds the fabric workpiece by an inter-stitch pitch (P2) between the handstitches during a second stroke of the open eye needle (13).

Abstract: A puckering preventing shuttle device of a sewing machine capable of providing high quality stitches without producing puckering by eliminating needle thread extraction resistance on the outer periphery of a rotating hook bobbin case holder to reduce the tension of a needle thread so as to keep a balance between the needle thread and a bobbin thread and also enabling the proper tightening of the threads even in an extra-soft fabric. The device comprises the rotating hook bobbin case holder (80) storing a bobbin case storing a bobbin around which the bobbin thread is wrapped and detachably fixed to a machine frame and locked to the machine frame by rotating hook bobbin case holder stopper (90) to stop its rotation and a rotating hook (70) in which the rotating hook bobbin case holder (80) is installed, having a sword tip (75), and rotated by a lower shaft.

Abstract: A sewing thread (20) can be captured certainly with a thread capturing open eye (13a) of an open eye needle (13) and the stitches are formed in the inner space of a sewing machine bed (3). A handstitch and a locked stitch are formed, respectively, on the front surface and the back surface of a fabric workpiece (21) as a skip stitch set through cooperation of the open eye needle (13), a shuttle hook (200) and a thread draw out actuator (401). A feed dog (601) feeds the fabric workpiece by a stitch length (P1) for handstitch during a first stroke of the open eye needle (13), and feeds the fabric workpiece by an inter-stitch pitch (P2) between the handstitches during a second stroke of the open eye needle (13).

Abstract: A puckering preventing shuttle device of a sewing machine capable of providing high quality stitches without producing puckering by eliminating needle thread extraction resistance on the outer periphery of a rotating hook bobbin case holder to reduce the tension of a needle thread so as to keep a balance between the needle thread and a bobbin thread and also enabling the proper tightening of the threads even in an extra-soft fabric. The device comprises the rotating hook bobbin case holder (80) storing a bobbin case storing a bobbin around which the bobbin thread is wrapped and detachably fixed to a machine frame and locked to the machine frame by rotating hook bobbin case holder stopper (90) to stop its rotation and a rotating hook (70) in which the rotating hook bobbin case holder (80) is installed, having a sword tip (75), and rotated by a lower shaft.

Abstract: In a cover stitch sewing machine which forms double chain stitch seams, needle threads are pulled out from the needle thread tensioning devices, passing over a thread hanging point on a needle thread pulling-up spring and the needle thread take-up completes drawing-up of the needle threads after needle thread loops of the respective needles are seized by the looper. The sewing material is then fed one feed pitch as the needles are moved down and the needle thread take-up draws out the needle threads, while the needle threads are pulled up at the thread hanging point by the elasticity of the needle thread pulling-up spring, thus preventing slack in the needle threads below the needle thread eyes. The threads which are connected with the needle thread loops, are drawn up by the thread hanging point of the needle thread take-up against the resiliency of the needle thread pulling-up spring.

Abstract: In a looper and cutter drive mechanism for sewing machine, an upper looper and a lower looper are respectively disposed below a throat plate, respective loop-taker points of these loopers are arranged in the same direction such that the loop-taker points pass a front side of the needle as seen in the stitching direction. The upper looper and the lower looper are driven such that the upper looper and the lower looper perform movements having traces on planes substantially parallel to each other. Due to such a constitution, the looper drive mechanism has both of the lockstitching function and the over-edge stitching function and can perform both functions by a single sewing machine.

Abstract: A packaging carton is made by folding a quadrilateral sheet S1 in a polyhedron having specified length, width and height with a flat flange F1 provided around its periphery so that a sealing cover can be bonded on the flange. The quadrilateral sheet comprises four inward folding lines V1 to V4 each being formed to pass two of four corner points C1 to C4 of a bottom plane B1 of the polyhedron having the specified length and width, and four outward folding lines M1 to M4 each being formed to be in parallel with each of the four inward folding lines with a distance therefrom equal to the specified height, and to have a length equal to a distance between the two of the four corner points L1 or L2 on the inward folding line in parallel therewith.

Abstract: A thread feeding apparatus for a sewing machine which has a simplified mechanism for accuracy of manufacturing and improved durability so as to accommodate high speed sewing. The thread feeding apparatus for the sewing machine has upstream grippers for respectively gripping an upper looper thread and a lower looper thread, closed by a stitch forming device at the time of the stitch forming and opened at the time of the cloth feeding, downstream grippers for gripping the respective threads introduced from the respective upstream grippers, opened at the time of the stitch forming so that the respective threads are pulled by the stitch forming device and closed at the time of cloth feeding, and reciprocators which are respectively driven in a synchronous manner with a left needle, a right needle, an upper looper and a lower looper, at the time of cloth feeding.

Abstract: A thread feeding device for a sewing machine, is simply constructed but can feed a plurality of looper threads individually in amounts necessary for each seam with adjustment of the tensions of the looper threads by one adjustment knob. The thread feeding device includes a shaft fixed on the machine body orthogonally of the feeding direction of a plurality of threads. A rotor is mounted on the shaft as to rotate intermittently in one direction only. A plurality of thread holders are provided on the rotor for holding and letting off the threads individually. In each thread holder the radius from the center of rotation of the rotor to the position where the thread is held is set to a value corresponding to the individual length of feed of the thread.

Abstract: Upper and lower loopers 2 and 3 are annular loopers. A pump 4 for supplying pressurized air is connected to thread introduction portions 7, which are connected to thread inlets of the loopers through annular conduits 5 and 6 and conduits 5' and 6'. The conduits 5' and 6' are slidable relatively to the conduits 5 and 6, and are connected to thread inlets of the loopers in the threading operation. In this state, the pressurized air is supplied from the pump 4 to the thread introduction portion 7, whereby the thread is transferred by the flow of the air and is fed to an outlet of the annular looper. A connecting portion moving plate 10 for connecting the conduits 5' and 6' is positioned in a disengaged position during the operation of the sewing machine by a stopper 18 and is positioned in an engaged position during a threading operation.

Abstract: A looper mechanism for use in a sewing machine which includes a needle moved substantially vertically through a needle plate while inclined in a feed direction of cloth. The looper mechanism includes a lower looper which performs an arcuate reciprocating motion crosswise to the locus of the needle at the lower side of the needle plate, and an upper looper which performs an elliptically-arcuate reciprocating motion crosswise to the locus of the lower looper at the side of the needle plate and crosswise to the locus of the needle at the upper side of the needle. A needle thread which is passed through the needle, an lower-looper thread passed through the lower looper and an upper-looper thread passed through the upper looper being cross with one another to perform sewing. At least one of the upper looper and the lower looper has a hollow structure through which a looper thread is passed from a thread inlet of the looper to a tapered thread outlet.

Abstract: A stitching mode changer for an overlock machine which enables stitching modes, i.e., ordinary overlock stitching, standard roll hemming, and special roll hemming, to be changed by a one-touch control operation and which is free from danger of an accident, e.g., breakage of a looper, due to erroneous operation. When a fabric feed dial is set to a feed rate for the ordinary overlock stitching, an adjusting member is flush with a needle plate, but, when the fabric feed dial is adjusted to a feed rate for the standard roll hemming, a cam that is secured to the dial rotates, so that a lever that abuts on the cam surface of the cam pivots, causing the adjusting member engaged with the lever to withdraw below the needle plate. The advance and withdrawal of the adjusting member are reliably effected by a combination of a spring and a retainer for guide, which are provided on a lower knife mount that supports the adjusting member.

Abstract: Disclosed is a button-hole sewing machine which includes an electric motor for driving the sewing machine; a machine body including a bed for holding a workpiece in cooperation with a workpiece clamping means; a stitch forming device for working button-holes in the workpiece and including a mechanism for driving a needle bar which supports a needle, a looper-spreader mechanism for driving a looper and a spreader, and a turning mechanism for turning the needle bar, the looper and the spreader. The needle bar driving mechanism includes a vertical reciprocation mechanism and a needle lateral vibrating mechanism; and an arm shaft for driving the up/down moving mechanism.

Abstract: Disclosed is a button-hole sewing machine which includes an electric motor for driving the sewing machine; a machine body including a bed for holding a workpiece in cooperation with a piece clamping means; a stitch forming device for working button-holes in the work piece and including mechanism for driving a needle bar which supports a needle, a looper-spreader mechanism for driving a looper and a spreader, and a turning mechanism for turning the needle bar, the looper and the spreader. The needle bar driving mechanism includes a vertical reciprocation mechanism and a needle lateral and an arm shaft for driving the up/down moving mechanism.