865results about "Loop takers" patented technology

Pressurized gas for carrying looper thread by gas is generated by gas supply pump operated by changing over a sewing-machine motor, which drives stitch forming device, looper threading is performed through loopers by one-touch operation. Gas carrying threading device of sewing machine, comprising: looper thread introduction mechanism inserts looper thread guided to loopers; hollow looper thread guide extends from looper thread introduction mechanism to looper thread inlets and has looper thread guide outlets; gas supply pump for performing looper threading by carrying looper thread by gas from looper thread introduction area through hollow looper thread guide to looper thread loop-taker point outlets; clutch for transmitting power from sewing machine motor M to drive shaft which drives stitch forming device including loopers at time of stitch formation or to gas supply pump at time of looper threading.

An overlock sewing machine has a movable cutter which is activated in association with rotation of a main drive shaft to cooperate with a fixed cutter provided in the same plane with an upper surface of a needle plate, to thereby cut a work while the work is being stitched. A link mechanism includes a drive link having one end rotatably connected to a mount and the other end is connected to the movable cutter and a swingable link having an arcuate guide groove extending between one end and a center axis thereof around which the swingable link is swingingly moved. The drive link has a point between opposite ends thereof operatively connected to the arcuate guide groove of the swingable link. An operating device includes an operating shaft which is operatively connected to the point of the drive shaft so that the point of the drive link may be substantially moved along the arcuate guide groove of the swingable link between said one end and center axis thereof by manipulation of an operating knob. The drive link having the point thereof moved to one end of the swingable link will be swingingly reciprocated to activate the movable cutter, and having the point thereof moved to the central axis of the swingable link will move the movable cutter to an inoperative position below the needle plate where the movable cutter is held at standstill.

The sewing machine has a looper (8) which is powered to rotate around a vertical axis, incorporating a bobbin capsule (21) with lifter cams (31). A capsule lifter (33) has a lifter lever (32) to make contact with the cams, and a feeler lever (40). The feeler lever lies against a cam disk surface (42) of an axial cam disk (39), fitted to a transmission shaft with its power taken from the looper drive shaft (10).

A method and apparatus for preventing a seam from raveling in a double chain stitch sewing machine according to the present invention are applied to sewing of cloth by a double chain stitch sewing machine. Near the sewing end point for forming a double chain stitch by collaboration of a plurality of needles and a looper, the looper thread consecutive to the looper from the cloth is hooked and engaged on the hook at the left side of the needles. After driving the sewing machine for a half stitch or one stitch in this state, the looper thread hooked on the hook is cut off. Simultaneously with this cutting or before or after the cutting, the needle thread loop consecutive to the needles from the sewing end of the cloth through the looper is cut off between the looper and the cloth. Further, capturing the cut looper thread consecutive to the looper from the cloth, the end of the cut looper thread is pulled out from the final needle thread loop at the end of sewing. Therefore, raveling of thread from the sewing end point is prevented, and the length of the thread end consecutive to the sewing end point is short, so that sewn products of good appearance may be obtained.

A thread tension guide apparatus for a sewing machine is provided to inhibit the heat emission of a tension discharge actuator, thereby enhancing the efficiency of the sewing work. The thread tension guide apparatus comprises a tension releasing device. In the tension releasing device, an output shaft protruded by the operation of a tension releasing solenoid separates a pair of thread control dishes and releases the tension of the upper thread. In the thread control dish, the tension releasing device drives to the tension release state and thereafter the tension release state is maintained by a tension maintaining device. At the state that the tension releasing state is continuously maintained by the tension releasing device, a stop device stops the operation of the tension releasing solenoid. The tension maintaining device comprises a tension releasing actuator for switching a combination member. A control box(6) is installed at the lower right end of a sewing machine table(4).

A sewing machine includes a rotating hook, a lower shaft rotating the rotating hook in synchronization with vertical movement of the needlebar, a lower shaft gear including a helical gear and slidably mounted on the lower shaft, a hook gear including a helical gear capable of mesh engagement with the lower shaft gear and mounted on the rotating hook, a drive force transmission mechanism supporting the lower shaft so that the lower shaft is axially moveable and transmits rotation of the lower shaft to the lower shaft gear, a cam mechanism axially moving the lower shaft gear to adjust at least one of a left encounter timing for seizure of the needle thread loop by the hook beak when the needle occupies a left needle location and a right encounter timing for seizure of the needle thread loop by the hook beak when the needle occupies a right needle location.

The invention belongs to the technical field of machinery and discloses an industrial sewing machine. A needle holder is driven to do vertical reciprocation by a swing rod and is driven to rotate around the needle holder axis by a needle holder rotation motor. A rotary hook and a hook carrier are mounted on a hook carrier assembly which comprises a shell, a rotary disc, a circular rotary seat, a belt pulley ring, a rotary hook motor, an assembly bearing and a slip ring. The rotary hook assembly is driven to do horizontal rotation by a rotary hook motor. Cloth to be sewn is clamped by a cloth feeding mechanism to do plane moving between the needle holder and the rotary hook. The needle holder rotation motor, the rotary hook carrier motor and the rotary hook motor are connected to a programmable logic controller on a table through the slip ring. The programmable logic controller drives the needle holder and the rotary hook carrier assembly to do rotation with same phase and same angular velocity. Products sewn by the industrial sewing machine have stable and firm stitches, and the industrial sewing machine is particularly suitable for sewing leather/cloth products in variable curved shapes.

A threading to a looper is performed with one-touch operation. A looper threading/sewing changeover mechanism 30 including a push button 33 for a pressing operation of a push button shaft 32 that a control pin 31 is protruded and provided, a control groove cam 38 which includes a first control groove cam portion 34—a fourth control groove cam portion 37 which receive the control pin, a connecting movement plate 40 which supports a thread guide portion and which is elastically repelled toward a threading state that a thread guide outlet of the thread guide portion contacts to a looper thread inlet of the looper by a first spring 39, and a connecting positioning plate 82 which rotates together with a main shaft 2 integrally and has a peripheral surface 80 that a tip portion 41 of the push button shaft contacts and has a notch portion 81 that the tip portion of the push button shaft is fitted is provided.

A sewing machine includes an upper looper formed with a thread hole, an upper looper shaft which oscillates the upper looper between an upper position and a lower position, switching means operable to switch a coupled state and a decoupled state between the upper looper and the upper looper shaft, moving means for moving the upper looper, which has been decoupled from the upper looper shaft by the switching means, to the lower position, a thread guiding pipe formed with a thread discharging port, and first operating means operable to decouple the upper looper and the upper looper shaft via the switching means, and to move the thread discharging port of the thread guiding pipe to a position at which the thread discharging port is aligned with the thread hole of the upper looper in the lower position.

The present invention is to improve sewing efficiency through omitting the regulating work of the installation position of a kettle (or a beating ring device) generated through the thickness of the matter to sewing or the rotation delay of sewing speed as well as a kettle (or a beating ring device). A sartorius comprises an upper axis, which keeps a needle of a sewing needle move up and down; a lower axis, driving a sewing catching unit which catches the upper thread of the sewing needle to swing with the lower thread; a drive source, applying rotary drive on the upper axis and the lower axis; an upper axis rotary part, rotating along with the upper axis; a lower axis rotary part, rotating along with the lower axis; a drive transferring part, which loop shaped frames set on the upper axis rotary part and the lower axis rotary part, at the same time transfers the rotary drive of a rotary part rotated by means of the drive source to another rotary part, the drive transferring part ensures the length rate of two frame parts connecting with the position between the upper axis and the lower axis rotary part to be alter automatically through outside force.

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).

A looper threading apparatus includes a threading member capable of holding a thread in a tip portion and inserting the thread through a thread hole, a guide member for movably accommodating the threading member and guiding the threading member to the thread hole, and a support member for supporting the guide member to freely approach and separate from the thread hole provided on an extended line of the threading member accommodated by the guide member. Moreover, there is provided a moving mechanism for moving the threading member and the guide member along an axis of the thread hole provided on the extended line. The moving mechanism moves the guide member and the threading member with respect to the thread hole provided on the extended line in such a manner that the tip portion of the threading member penetrates through the thread hole.

The sewing machine of the present invention has a needle bar crank linked to a main shaft, a vertical movement transmission mechanism linked to the needle bar crank, and a needle swing mechanism for swinging the needle bar. The up and down movement transmission mechanism includes: a ring-shaped member having a space defined by a ring-shaped inner peripheral surface, through which the needle bar passes; and a pair of upper and lower needle bar frame members, which are fixed on the outside of the needle bar, and Arranged on the upper and lower sides of the ring member. The ring member is journally connected to the needle bar crank. A clearance for swinging is ensured between the annular inner peripheral surface of the space of the annular member and the outer periphery of the needle bar. The needle bar can swing without being in contact with the annular inner peripheral surface within the swing gap.

The invention belongs to the technical field of quilting machines, and particularly relates to a numerical-control sewing and embroidering quilting machine provided with a horizontal multi-needle machine head. The numerical-control sewing and embroidering quilting machine comprises a frame, wherein the frame comprises a rack and an upper frame which is arranged at the upper end of the rack; the frame is provided with the multi-needle machine head capable of moving longitudinally; a rotating shuttle mechanism is arranged under the multi-needle machine head; the frame is provided with a first driving mechanism for driving the multi-needle machine head and the rotating shuttle mechanism to move synchronously; the multi-needle machine head is connected with the upper frame in a sliding manner; the rotating shuttle mechanism is connected with the rack in the sliding manner; the frame is also provided with a second driving mechanism for driving a fabric to be fed horizontally. The multi-needle machine head of the numerical-control sewing and embroidering quilting machine is arranged in a direction vertical to the feeding direction of the fabric, so that two adjacent needles have no interference in sewing trace during sewing, no wired node is formed in a spliced point, and thus the node is unlikely to loosen, and the quality and the attractive appearance of the product are guaranteed; a plurality of sewing needles work simultaneously, so the production efficiency is improved.

The invention discloses a process for manufacturing a rotating shuttle inner shuttle bottom supporting structure, which comprises the following steps of powder molding, sintering and blast sanding, wherein in the step of powder molding, iron-based alloy powder is prepared into a rotating shuttle inner shuttle blank by using a metallurgy powder molding method; a strip-shaped plate is prepared at the bottom of the rotating shuttle inner shuttle blank, and supporting plates are respectively arranged between one side of the strip-shaped plate and a side wall of the rotating shuttle inner shuttle blank and the other side of the strip-shaped plate and the side wall of the rotating shuttle inner shuttle blank respectively; the rotating shuttle inner shuttle blank is subjected to a step of punching molding after the steps of sintering and blast sanding; in the step of punching molding, the supporting plates at the bottom are punched and separated from the rotating shuttle inner shuttle in a punching mode. In the process for manufacturing the rotating shuttle inner shuttle bottom supporting structure, a rotating shuttle inner shuttle is manufactured by the powder metallurgy technology, and the supporting plate structure is prefabricated, so that a product does not deform during sintering and molding. Therefore, the sintered product has high hardness and strength and more uniform texture.

The present invention relates to shuttle driving device of a sewing machine, wherein the arrangement space of two shuttles is adjusted through moving a shuttle seat. A shuttle driving shaft of the shuttle seat and a lower shaft in a base are sustained to a transmission state in the moving range of the shuttle seat. The shuttle seat is a small component configured in the base. An operator can easily adjust the arrangement space through moving the shuttle seat. The shuttle seat moves at a state when the connection between the shuttle driving shaft and the lower shaft is sustained. An operator can adjust the arrangement space of two shuttles at a state that the rotation positions of shuttles are unchanged.

This invention provides a thread adjusting device of sewing machine, which is capable of stably giving minute tension to the top thread provided to the needle through a balance, and is capable of sewing thin cloth, soft cloth with good quality but without generating stitch defect. The thread adjusting device comprises an auxiliary thread adjusting device for giving preparation tension to the top thread provided to a rotation resistance main thread adjusting device (4), including: a rotary cylinder (51) that winds and keeps several rings top threads in the peripheral width direction in a spaced way, an extruding spring (53) applying thrust to the rotary cylinder (51) and a regulating knob that adjusts the spring of the extruding spring (53). In addition, a guide groove is formed in a thread passage component (8) extending in the width direction of the rotation cylinder (41). The top thread (2) wound on the rotation cylinder (51) is hanged in the guide groove. The perimeter of the top thread (2) is gradually shortened from the thread supply source to the main thread adjusting device (4).