205results about "Thread-laying mechanisms" patented technology

A threading device of a sewing machine includes a thread inserting base formed with a thread path hole having a thread inserting port opened toward an outer side of a sewing machine frame, and further formed with an air path hole which joins the thread path hole in the vicinity of the thread inserting port, an air supply device coupled to the air path hole to supply compressed air, and illuminating means provided on the sewing machine frame to irradiate a joining portion of the thread path hole and the air path hole. The thread inserting base includes a transparent member through which at least the joining portion of the thread path hole and the air path hole can be visually recognized.

The invention provides a wire grip of a sewing machine, pertaining to the sewing machine field, which solves the problem that: an ordinary computer controlled flat bed sewing machine tends to cause a nest-shaped stitch. The wire grip of the sewing machine is positioned on a machine head of the sewing machine and between a small wire clamping nut and a wire clamping device; the wire grip consists of a wire drawing head arranged on the machine head and a drive device that can ensure the wire drawing head to slide to and fro along the level direction, and the wire drawing head is provided with a through hole for passing a sewing wire. The wire grip of the sewing machine has the advantages that the nest shaped stitch does not be produced during the sewing process, so the stitch is beautiful; moreover, the wire grip has the advantages of simple whole structure, convenient operation and using, low manufacturing cost, and good working stability.

A sewing machine includes a looper formed with a thread hole, a looper shaft holding the looper, and a thread pipe fixed to the looper shaft. The thread pipe includes a thread inserting port at one end and a thread discharging port at the other end. The sewing machine further includes a nozzle from which air is sprayed toward the thread inserting port, a switching mechanism operable to disconnect the looper from the looper shaft when the looper is at a front position, and a moving member which moves the looper to a rear position when the looper is disconnected from the looper shaft by the switching mechanism. When the looper is disconnected from the looper shaft and is moved to the rear position, the thread discharging port matches the thread hole, and the thread inserting port becomes close to the nozzle.

A sewing machine includes a sewing needle having an eye, a threading hook passed through the eye of the needle, a traveling mechanism for traveling the threading hook so that the threading hook is advanced through the eye of the needle and retreated through the eye of the needle, a thread holding member for holding the thread, a moving mechanism for moving the thread holding member between a first position where the thread holding member is close to the threading hook having been advanced through the eye of the needle and a second position where the thread holding member is away from the threading hook having been advanced through the eye of the needle, and a speed reducing mechanism for reducing a moving speed of the thread holding member while the thread holding member is holding the thread and being moved near the threading hook having been advanced through the eye of the needle.

This invention is related to a thread wiping device of sewing machine. This invention includes a fixing component that allows a needle rod to pass through a sewing needle and is combined at the lower part of a sewing head of the sewing machine; a fastening component combined at the fixing component; a power generating mechanism combined at the fastening component so as to generate the driving force; a power transmission mechanism connecting the power generating mechanism and transmitting the power; and a thread wiping hook that convolutes in a set angle along the driving of the power transmission mechanism. According to this invention, the thread wiping hook is enable to convolute in the set angle after the fastening component connecting with the thread wiping hook to rotate about the needed angle by using the needed rod as the center, therefore, the broken thread can be easily extracted from the sewing material in any direction so that the sewing quality is improved.

A lower end of a thread guide lever, which is rockably attached to a lower looper and supports a thread pipe, and an air ejecting unit, which faces a thread inserting hole of the thread pipe and ejects air toward the thread inserting hole, are coupled via a coupling member so that they are interlocked with each other. The coupling member is moved such that a discharging port of an air nozzle is positioned at an ejecting position close to the thread inserting hole when a thread discharging hole is positioned at a threading position which is coincident with a thread hole of a lower looper, and such that the air nozzle is moved to a standby position when the thread discharging hole is moved to a retreating position.

The present invention provides an air suction device for a threading apparatus that creates an air flow to be directed toward a needle eye in order to guide a yarn through the eye. The air suction device is comprised of: (a) an air device externally provided for generating reduced pressure; (b) an air suction pipe connected to the external air device; and (c) an air path leading to a front portion of the air suction pipe. The air path is comprised of a pair of leaf springs to horizontally hold a needle, and upper and lower elastic members which run parallel between the pair of leaf springs. To effectively direct air into the needle eye, an air-tight environment is provided around the needle eye: (1) air entry above and beneath the needle eye is prevented by the body of the needle; (2) air entry from both sides of the needle is prevented by the pair of leaf springs that hold the needle; and (3) air inflow behind the needle is prevented by rear-positioned elastic members which tightly fit the needle.

A needle threader for a sewing machine includes a threading mechanism including a threading hook mounted on a lower end of a threading shaft and a thread guide member. The threading hook and the thread guide member are movable among a thread guide preparation position where the threading hook and the thread guide member are located near a height position of a needle clamp, a threading operation position where a threading operation is carried out with the threading hook being level with an eye of a needle, and a retreat position which is located above the thread guide preparation position and to which the threading hook and the thread guide member are retreated. A vertical moving mechanism moves the threading shaft vertically so that the threading mechanism is moved between the thread guide preparation position and the threading operation position.

A sewing machine includes a head on which a needle bar for fixing a needle is mounted, a thread cutting blade mounted in the head so as to be capable of cutting an end of a thread which is threaded so as to be passed through an eye of the needle, and a holder mounted in the head so as to be capable of holding the thread end after the thread end has been cut by the thread cutting blade. The thread cutting blade is positioned so that a first amount of thread from the eye of the needle mounted in the head to the thread end held by the holder equals a second amount of thread by which the thread end is drawn to an underside of a cloth in a stitch formed immediately after start of a sewing operation.

A threading device of a sewing machine is provided. The threading device includes a threading hook which moves forward to enter an eye of a needle to catch a needle thread, and moves rearward with the needle thread being caught to insert the needle thread through the eye, a threading shaft which holds the threading hook, an operating member which is operated to move the threading shaft, a threading operation mechanism which transmits the movement of the threading shaft to the threading hook to move the threading hook back and forth, and a restricting device which makes the threading operation mechanism inoperable when the spreader mechanism is attached to the sewing machine main body, and makes the threading operation mechanism operable when the spreader mechanism is detached from the sewing machine main body.

When performing the threading to the looper by one-touch operation, the abnormal changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism during the gas supply operation of the gas supply pump is prohibited. The device comprises: a clutch (60) for transmitting the power from the sewing machine motor (M) to the drive shaft (5) that drives the stitch forming device (30) including the looper (7, 8, 9) at the time of the stitch formation or to the gas supply pump (41) at the time of the looper threading respectively; a looper threading/stitch forming changeover mechanism (90) for changing over the clutch so that the transmission of the power to the stitch forming device is interrupted and the power is transmitted to the gas supply pump at the time of the looper threading and the power is transmitted to the stitch forming device and the transmission of the power to the gas supply pump is interrupted at the time of the stitch formation; and a changeover prohibition mechanism (160) for prohibiting the abnormal changeover to the stitch forming state of the looper threading/stitch forming changeover mechanism during the gas supply operation of the gas supply pump.

A sewing machine (M) comprising: a needle (1) through which a thread (T) is passed through a needle hole formed at a front end and which sews an object to be sewn placed on a needle plate by moving up and down, And the thread cutting device that cuts the thread (T) after the specified amount of sewing is completed, and the thread (T) is cut across the needle (1) and the object to be sewn after the thread (T) is cut by the thread cutting device. ) a thread wiper (2) drawn out from the object to be sewn, and a tension applying mechanism (3) that applies tension to the thread (T) inserted in the needle hole, and a thread tension control mechanism; wherein; the thread The tension control mechanism controls the action of the thread tension applying mechanism (3), so that when the thread (T) is pulled out from the sewing object by the thread wiper (2), tension is applied to the thread, and the thread (T) ) is pulled out from the object to be sewn to release the tension applied to the thread. In this sewing machine, the length of the thread coming out from the needle hole of the machine needle after the thread is cut can be optimized.

Provided is a thread feeding device of a sewing machine capable of selecting optimum thread-reeling-out control. In the thread feeding device of the sewing machine capable of selecting a first thread path R1 reaching a needle 9 through a swinging thread take-up lever 14 and a needle-bar take-up lever 16 from a bobbin 5 and a second thread path R2 reaching the needle 9 through the swinging take-up lever 14 from the bobbin 5, there is provided a swinging take-up lever thread receiver 17 arranged at the position separated from a thread-reeling hole 14bc of the swinging take-up lever 14 to the needle side, and a needle thread T selecting the second thread path is disposed can be engaged with the receiver 14.

A sewing machine includes a thread take-up lever and a thread tension regulator each disposed along a predetermined needle thread passage from a thread bobbin to a needle, an arm having a front face, and a movable controller disposed in the front of the arm so as to be movable at least within a predetermined range. The movable controller does not protrude out of the front face of the arm when moved in the predetermined range. The needle thread is engaged with at least one of the thread take-up lever and the thread tension regulator when the movable controller is moved within the predetermined range while the needle thread has been drawn from the thread bobbin near to the needle substantially along the predetermined needle thread passage.

The present invention provides a detachable threader, which permits an upper holder block to be connected separately with a brake and a base; and the brake is linked with a propeller; a threading sheet is fixed on the propeller; with the orientation pin and restoring spring on the base, the upper holder block can be controlled in a manner to make the threading sheet move freely in the threading groove of the needle stand; additionally, a V-shaped groove is arranged at the bottom of the adapting hole; after the needle is inserted into the adapting hole, it can align automatically the needle hole with the threading groove; moreover, the base is linked with the detachable pedestal, wherein the inner space with an oblique surface is used to accommodate the needle and stitch.

A sewing machine includes a plurality of thread hooking sections including a thread take-up lever and a thread tension regulator, and a thread guide thread hook mechanism having a thread hook member which is moveable nearly parallel to the vertical surface from a stand-by position to a thread hooking position. The sewing machine is configured to hook the extent of the needle thread from a thread transferring member moved to the vicinity of the eye to the thread take-up lever to hook it onto the needle bar thread guide.

A threading device of a sewing machine having a plurality of needles is provided. The threading device is configured to insert a thread through an eye of any one of the needles. The threading device includes a threading hook which moves forward to enter the eye of one of the needles and moves backward to catch and insert the thread through the eye, a threading mechanism which moves the threading hook to insert the thread, a selecting portion operable to select, among the plurality of needles, a needle through which the thread is to be inserted, a positioning mechanism which moves the threading hook to a position corresponding to the needle selected by operating the selecting portion, and a selected needle indicating device which distinguishably indicates the needle with respect to which the threading hook has been positioned by operating the selecting portion.

This sewing machine 1 includes a thread tension device 17 for applying pressing force to the needle thread, a needle thread handling member 29 for handling the needle thread guided from the thread tension device 17, air cylinders 26, 27 for moving the needle thread handling member 29 from the foremost position P10 through the middle position P30 to the last position P20, a needle thread cutting knife 14 for cutting the needle thread, and a control device 50 for controlling the air cylinders 26, 27. The needle thread is guided from the needle thread handling member 29 to a needle thread take-up lever 18 to finally reach a thread passing hole 6a of a needle 6. Immediately before the start of sewing, the needle thread handling member 29 is moved from the foremost position P10 to the last position P20. After the end of sewing, the needle thread handling member 29 is moved from the last position P20 to the middle position P30. After that, the pressing force to the needle thread is increased by the thread tension device. Subsequently, the needle thread handling member 29 is moved from the middle position P30 to the foremost position P10.