299results about "Needle-threading devices" patented technology

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.

A threading device of sewing machine is disclosed, wherein the upper thread extended from a thread supply mounted on a sewing machine body may be easily and smoothly guided into engagement with a thread holder simultaneously when the threading device is operated to pass the upper thread through the eye of needle attached to the lower end of needle bar, the thread holder being arranged between the thread supply and the needle. The threading device comprises a vertically movable needle bar 16 having a needle attached to the lower end thereof, the needle having a needle eye, a needle bar support 1 for supporting the needle bar 16 such that the same may be vertically movable, a thread holder 20 mounted to the lower end of the needle bar 16, a threading member A1 having a thread engaging portion 5 and a threading hook 4b, a threading shaft 2 for having the threading member A1 secured to the lower end thereof, an operating section C for vertically moving and axially rotating the threading shaft 2 to pass the upper thread n through the needle eye 17a, the threading member A1 being so formed as to provide the thread engaging portion 5 for guiding the upper thread to the needle eye 17a, the needle holder 20 being formed with a groove 20b for holding the upper thread n, the groove 20b having an opening 20a at which the upper thread n is guided into the groove 20b from the rear side of the thread holder 20 while the thread engaging portion 5 is moved down with the upper thread n which is to be passed through the needle eye 17a.

Problem: To thread a looper with a one-touch operation. Solution: Provided is a looper threading and sewing switching mechanism (30) comprising a push-button (33) for push operation of a push-button shaft (32) from which a control pin (31) protrudes; a control groove cam (38) comprising first through fourth control groove cam sections (34 - 37) that receive the control pin; a link shift plate (40) that supports a thread guide section and that by using a first spring (39) is snapped toward a threading state in which a thread guide outlet of the thread guide section is in contact with a looper thread inlet; and a link positioning plate (82) comprising a peripheral surface (80) and an interlocking cutaway section (81) that rotate integrally with a main shaft (2) and with which a top section (41) of the push-button shaft comes into contact.

Disclosed is a needle threading machine of putting a thread through an eye of a needle provided in a sewing machine, the needle treading machine comprising a thread supplying unit supplying the thread along a predetermined thread guiding path; a thread catcher comprising a hook to hook the thread, and a hook supporter extended from the hook and supporting the hook; a thread catcher driver driving the thread catcher to reciprocate allowing the hook to be inserted in and return from the eye of the needle; and a thread guiding unit hooking the thread supplied from the thread supplying unit on the hook passed through the eye of the needle. Thus, the present invention provides a needle threading machine, in which a thread is stably hooked on a hook, thereby reducing a defective needle threading work and enhancing productivity.

The aim of the present invention is to provide a threading device for embroidery machinery realized in such a way that it performs threading accurately regardless of the type of thread, for embroidery machinery, etc. capable of performing the processing for change of colored thread automatically without intervention of an operator, for example, comprises a needle support mechanism (7), disposed movably facing the hooking member (61a), for preventing deflection of the needle (10), by correcting deflection of the needle (10), when inserting the hooking member (61a) formed in the shape of a hook at the tip of the thread pull-out mechanism (61) in the needle hole (10a).