Abstract: A sewing machine for automatic thread taking-up and threading comprising a guide groove for guiding a needle thread to a threading preparatory position in the vicinity of a needle bar via a thread taking-up preparatory position intersecting a thread take-up moving area, a sewing machine motor driver for extracting the needle thread along the thread take-up moving area and for instructing a thread take-up to catch the needle thread, a pulse motor driver for threading the needle thread to an eye of a needle, a threading switch for generating signals, and an electronic control circuit for controlling the pulse motor driver and the sewing machine driver at prescribed timings in response to the signals from the threading switch. In the sewing machine, an operator has only to prepare a needle thread along the guide groove and push the threading switch.

Abstract: A sewing machine for automatic thread take-up and threading, which comprises a guide groove for guiding a needle thread from a bobbin to a threading preparatory position via a thread take-up preparatory position, a sewing machine motor driver and a sewing machine motor for extracting the needle thread at the thread take-up preparatory position along the thread take-up moving area and for taking up the needle thread using a thread receiver and/or a thread take-up, and a thread positioning member for keeping the end of the needle thread guided to the threading preparatory position and for positioning the needle thread in front of or at the rear of the eye of a needle, a threading member for performing the threading operation of the needle thread, and a prohibiting member for prohibiting the threading operation until the thread take-up operation is over. In the sewing machine, the thread take-up operation and the heading operation are automatically and successively performed.

Abstract: A sewing machine comprising a threading device and a needle-bar raising means. A threading switch is operated and a sewing machine motor is stopped. Subsequently, thread is passed onto a linkage, a needle bar is disconnected from an arm shaft, and the needle bar is raised to a given position. After the needle bar is set in its uppermost position, thread stretched out from the linkage 38 to the front of an eye in a needle is passed through the eye in the needle. If the end of thread is manually held in front of the eye in the needle to stretch out prior to threading operation, the needle bar does not lower, thus enhancing operational safety and preventing thread from loosening.

Abstract: A threading mechanism where a thread catcher hook is reciprocated between two needles by a movable means. Although the two juxtaposed needles are separated horizontally and vertically, position aligning means places the hook opposite either needle eye, thereby facilitating threading both needles and greatly improving sewing efficiency.

Abstract: A thread securing device in a sewing machine wherein an upper thread located along a thread guiding path is caught during the travel of a thread take-up member to effect automatic hooking of the thread thereto. The thread securing device includes a thread saving member capable of saving an amount of the upper thread corresponding to a predetermined amount of the upper thread to be taken up by the thread take-up member during its movement from a thread loosening position to a thread take-up position, and capable of feeding the saved amount of the upper thread freely in accordance with the thread take-up movement of the thread take-up member; and an actuating member adapted to catch the upper thread extending along the thread guiding path when the thread take-up member is not holding the upper thread and then supply an amount of the upper thread corresponding to the predetermined amount, to the thread saving member.

Abstract: In a device for disconnecting a needle bar from a needle-bar connecting stud on a sewing machine, a drive source drives a moving board. The moving board lowers a predetermined distance until a threading hook goes through an eye in a needle. A disconnecting member rotates a clutch click and disconnects the clutch click from a needle-bar connecting stud. The needle bar thus disengages from the needle-bar connecting stud. The moving board further lowers, an actuating rod lowers, the actuating rod in turn lowers a threading rod, the threading rod further rotates, and the threading hook goes through the eye. The needle is thus threaded. The disconnecting operation and the threading operation are carried out by using the drive source in common. Consequently, the device is simple in structure and compact in size. Since the needle bar only rises to disengage from the needle-bar connecting stud, no scratches are given on the fabric.

Abstract: A needle for forming the longitudinal stitching seam of a necktie has a needle point to which a wire is attached, the wire being capable of being rolled up on the needle spool of the necktie sewing machine. To reduce the complexity of the device required to thread a yarn into the needle point, the latter is formed with a hook whose outer surface is flush with the surface of the needle point and beneath which is provided a recess extending beyond the hook in the direction of the wire.

Abstract: The upper end portion (44) of a needle (10) is received within a blind socket (38) which extends axially upwardly into a lower end portion of a needle bar (12). A set screw (42) is received within a set screw opening (40) which intersects the socket (38). The set screw (42) is tightened to secure the needle (10) to the needle bar (12). The lower end portion of needle bar (12) includes an inclined side surface (24). Side surface (24) truncates the lower end portion of the needle bar (12). A circumferential groove (34) is provided on the remaining part of the lower end portion of needle bar (12), closely adjacent a lower end surface (30). A chamfer (32) is provided at the periphery of the end surface (30). Chamfer (32) functions to cam a snap ring (36) onto the lower end portion of needle bar (12) and into the groove (34). The inclined side surface (24) and a confronting portion of ring (26) defines a thread guide eye (46).

Abstract: The invention discloses an overlock sewing machine equipped with a threading unit of very simple configuration, which comprises a shaft having a threading member fixed thereon and a mechanism (including arm and disc elements) for determining the rotation timing of the shaft.

Abstract: A sewing machine with an automatic threader comprises a threading hook for threading a needle, a thread carrying member for passing a thread through a thread take-up spring, a thread holding device for extending the thread from a thread take-up lever near to the thread eye of the needle so that the threading hook is able to catch the thread, an actuating lever for moving the thread holding device releasably holding the thread near to the needle and making the thread holding device transfer the thread to the threading hook, and an operating member for operating the thread carrying member and the actuating lever. These components of the automatic threader are interlocked with each other so that the thread is extended to the threading hook and is passed through the thread eye of the needle automatically by the single downward stroke of the operating member.

Abstract: A sewing machine is disclosed herein. The sewing machine comprises a looper rockably supported on the frame of the machine below the throat plate for rocking movement in response to the rotation of the machine shaft and having first and second thread holes, a thread transfer mechanism adapted to move the leading end of a looper thread to a position facing the second thread hole after the leading end of the thread has passed through the first thread hole and a threading device adapted to pass the leading end of the looper thread through the second thread hole.

Abstract: Semiautomatic threading of bonding wire into the guide hole of a wire bonding tool is accomplished by holding the end of the wire in a reference position while its standing part is disposed in the wire feed mechanism of the machine and by activating the feed mechanism after the tool and work positioning mechanism of the machine have placed the bonding tool in line with the wire proximate to the wire end. A preferred apparatus for holding the end of the wire in place is a structure which forms a ledge and has a notch in the edge of that ledge.

Abstract: A manually operable needle threading device comprises a housing having a recess for positioning the eye of a needle to be threaded in alignment with the path of a displaceable thread pusher member in the housing, whereby displacement of the pusher member from a retracted to an extended position pushes a portion of a thread between the needle and pusher member through the needle eye. The pusher member displaces the portion of thread between gripping fingers on the housing which hold the thread portion upon displacement of the pusher member from the extended to the retracted position. The portion of thread remains attached to the threading device upon separation of the needle therefrom until a loose end of the thread passes through the needle eye to complete the threading operation, after which the thread portion is released from the threading device. In one embodiment the housing is of pistol-like configuration facilitating handling and operation of the threading device.

Abstract: A threader for a mounted sewing machine needle having an eye adjacent the pointed lower end thereof includes a base plate adapted to be received beneath the foot of the machine, and a housing providing a positioning recess for aligning the needle threader with the sewing machine needle eye. The housing supports a pair of reciprocable thread pusher members at right angles to one another, and when the device is aligned with the needle eye, the first pusher member is displaceable from a retracted to an extended position to push a strand of thread through the needle eye from one side thereof to the other. When the first pusher member is returned to the retracted position, the second thread pusher member is displaceable from a retracted to an extended position to engage a loop of thread on the other side of the needle eye and to displace the thread laterally of the needle to a position where it can be easily grasped by the user's fingers.

Abstract: There is disclosed a needle threader comprizing a support provided with a needle accommodating notch and a thread guide groove, and a pair of resilient rollers rotatably mounted on the support and contacting at the respective peripheral edges with each other. In the needle threader, an eye of a needle accommodated in the needle accommodating notch is located on a tangent line passing through the contact portion of the pair of resilient rollers. A thread introduced via the thread guide groove towards the proximity of the contact portion of the pair of resilient rollers is gripped by and transferred through rotation of the resilient rollers, resulting in the thread being passed through the eye of the needle.

Abstract: A needle threading device for sewing machines includes a thread guide which is pivotably mounted on a mounting plate parallel to the needle bar; a projection at the end of the thread guide is displaceable against the needle, and a thread inserting element operated by a pushbutton is slidably mounted for alignment with the thread guide to push the thread through the needle eye.

Abstract: A device for threading the stitch forming instrumentalities of a sewing machine from a thread supply up to a sewing needle. A lever is pivotally mounted in the sewing machine frame and is located at the sewing head which when pulled outwardly, thread, which has been placed across the lever, is drawn into a loop and is urged, by the lever, into a tension device, into a thread take-up lever, and under a check spring assembly.

Abstract: A pneumatic needle threading assist is disclosed which has a thread collecting chamber in which, due to the air flow therethrough, thread having passed through the eye of a sewing needle, is therein deposited in a series of spiral loops limiting the amount of thread in the vacuum line and preventing the vacuum source from being contaminated with the thread.

Abstract: A pump is disclosed having a housing with a recess therein, an elastomeric diaphragm stretched across said recess forming a pump cavity in which the medium being pumped is circulated, and inlet and outlet valves. An electronically controlled linear actuator is attached to the diaphragm within the pump cavity thereby allowing compactness in the construction of the pump and improved heat dissipation from the linear actuator. The pump fits within the frame of a sewing machine and creates an air vacuum for assisting in needle threading.

Abstract: A needle threader assist which uses a needle threader having a conical opening for guiding thread through a bore thereof into the eye of a sewing needle supported by a sewing machine. Support means are provided with the needle threader which when moved to an operative position, unlatches the needle bar from its drive means and elevates it to an uppermost position and simultaneously moves the needle bar to a predetermined lateral position, permitting the bore of the needle threader to be readily located axially with the eye of the sewing needle.

Abstract: A pump for needle threading is disclosed having a housing with a recess therein, an elastomeric diaphragm stretched across said recess forming a pump cavity in which the medium being pumped is circulated, and inlet and outlet valves. An electronically controlled linear actuator is attached to the diaphragm within the pump cavity thereby allowing compactness in the construction of the pump and improved heat dissipation from the linear actuator.

Abstract: A pump actuating mechanism which allows a sewing machine motor to be used for operating a pneumatic pump. The mechanism utilizes two oppositely arranged, single direction, overrunning clutches, one connected to the sewing machine drive and the other connected to a pump linkage. An electrical switch is used to reverse the direction of the motor rotation thereby disengaging the motor from the sewing machine drive and engaging the motor with the pump linkage.

Abstract: A device which introduces compressed air at an angle to thread placed in a split tube. When this split tube is placed adjacent to the eye of a sewing needle, the compressed air will shift the thread through the tube and thence through the needle eye. The split is provided in the tube to allow the device to be removed from the thread after the needle has been threaded. Frictioning means may be included for holding the thread in the tube until the compressed air is introduced.

Abstract: A thread feeder for sewing machines is disclosed which feeds the thread from one of the bobbins to an automatic threading machine. It includes a movable table over the sewing machine, bobbins mounted thereon, thread tension regulators for adjusting tension to the thread from the bobbin, and feed rollers for feeding the thread from the thread tension regulator to the automatic threading device on a sewing machine. By such an arrangement, threads of different color or material can be fed conveniently one after another in a desired order.

Abstract: An automatic threading device for sewing machines is disclosed which can thread the needle thereon automatically. It carries with a stream of air the thread from a thread feeder through the thread take-up at standstill, guides it to the front of the needle hole, and passes it through the needle by means of a threading tool.

Abstract: A sewing needle threader using the presser foot of a sewing machine as a housing is disclosed. A movable rod is slidably mounted in the housing and contains a tiny hook adapted for insertion through the eye of a needle on one end of the rod. A spring is coiled around the rod and confined between defining walls of a chamber of the housing into which the other end of the rod projects. The rod is adapted to attach to a pivotally mounted handle located outside of housing. The handle may be placed in a raised position when not in use and may be lowered into alignment with the rod for advancing the hook through the front of the housing into engagement with the eye of a needle. In another embodiment the housing is adapted for use in threading hand held needles.