Needle threading device used in sewing machine
AssigneeBrother Kogyo Kabushiki Kaisha
InventorYoshihisa Shoji
Life of this patent
Estimating the term…
Abstract
The hook mechanism 30 and the first thread guide member 24 are attached to the lower end of the needle threading shaft 21 so as to be integrally with each other. The second thread guide member 26 is rotatably supported by the needle threading shaft 21. When the needle threading shaft 21 rotates in the clockwise direction C, the second thread guide member 26 is pivoted by the link mechanism 50 in the direction toward the hook mechanism 30 and away from the first thread guide member 24. As a result, the needle threading hook 32 reaches the sewing needle 11 and penetrates through the sewing needle eye 11a of the sewing needle 11. Also, an amount of the upper thread 23 required for threading the sewing needle 11 is automatically fed from the free end portion 23a of the upper thread 23 in a simple manner.
Claims16
A needle threading device used in a sewing machine comprising a needle bar extending in a vertical direction and supporting a sewing needle formed with an eye, the needle threading device comprising;
- a hook mechanism that is pivotable from an initial position to a pivoted position by a predetermined angle, the hook mechanism comprising a hook, wherein when the hook mechanism pivots to the pivoted position, the hook penetrates through the eye of the sewing needle;
- a first thread guide that is provided at a position separated from the hook mechanism by a predetermined distance;
- and
- a second thread guide that is provided at a position close to the first thread guide, wherein
- when the hook mechanism pivots to the pivoted position, the second thread guide pivots relative to the first thread guide so as to locate at a substantially opposite side of the sewing needle from the first thread guide.
A needle threading device used in a sewing machine comprising a needle bar stand and a needle bar supported by the needle bar stand, the needle bar extending in a vertical direction and supporting a sewing needle formed with an eye, the needle threading device comprising;
- a threading shaft that extends in the vertical direction, the threading shaft being supported by the needle bar stand at a position close to the needle bar so as to be rotatable and movable in the vertical direction, the threading shaft having a lower end;
- a hook mechanism that is attached to the lower end of the threading shaft, the hook mechanism comprising a hook;
- a pivot mechanism that lowers the threading shaft from a predetermined upper position to a predetermined lower position and rotates the threading shaft in a rotational direction by a predetermined angle at the predetermined lower position, wherein when the pivot mechanism rotates the threading shaft at the predetermined lower position, the hook mechanism is pivoted in the rotational direction together with the threading shaft, and the hook penetrates through the eye of the sewing needle;
- a first thread guide that is fixed at the lower end of the threading shaft at a position separated from the hook mechanism by a predetermined distance;
- a second thread guide that is pivotably supported by the lower end of the threading shaft, wherein when the threading shaft is at the predetermined upper position, the second thread guide is at a position close to the first thread guide;
- and
- a link mechanism that links the first thread guide and the second thread guide such that when the pivot mechanism rotates the threading shaft in the rotational direction, the second thread guide pivots relative to the first thread guide so as to locate at a substantially opposite side of the sewing needle from the first thread guide.
Dependencies are inferred from the claim text.