Threading device of sewing machine

Patent metadata

Field	Value
Publication number	US-10344412-B2
Application number	US-201615055383-A
Country	US
Kind code	B2
Filing date	Feb 26, 2016
Priority date	Mar 30, 2015
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A threading device of a sewing machine includes: a needle bar which is supported on a sewing machine body so as to be slidable in an up-down direction and to a distal end of which a needle having a needle hole is attached; a threading shaft member which is movably supported on the sewing machine body in parallel to the needle bar; a guiding member provided at a lower end of the threading shaft member so as to guide a thread to the needle hole; and an air supplying member that supplies air to the guiding member. The guiding member includes: a guiding path portion of which the path width gradually narrows toward the needle hole such that the air supplied from the air supplying member is guided toward the needle hole.

First claim

The invention claimed is:

1. A threading device of a sewing machine, comprising:
a needle bar which is supported on a sewing machine body so as to be slidable in an up-down direction and to a distal end of which a needle having a needle hole is attached;
a threading shaft member which is movably supported on the sewing machine body in parallel to the needle bar;
a guiding member provided at a lower end of the threading shaft member so as to guide a thread to the needle hole; and
an air supplying member that supplies air to the guiding member,
wherein the guiding member includes:
a guiding path portion of which a path width gradually narrows toward the needle hole such that the air supplied from the air supplying member pushes air guided toward the needle hole and of which an upper surface is open; and
a needle receiving portion which is formed continuously, within the guiding member, to the guiding path portion so as to determine a position of the needle hole, and

the needle and the thread passed through the needle hole are, after threading, removed through the open upper surface of the guiding member.

2. The threading device of a sewing machine according to claim 1 , wherein a linear narrow groove portion is formed in the guiding path portion of the guiding member, and the needle receiving portion is formed continuously to the narrow groove portion.

3. The threading device of a sewing machine according to claim 1 , wherein an opening of the guiding path portion of the guiding member facing the needle hole of the needle disposed in the needle receiving portion has a width equal to or smaller than a width of the needle hole.

4. The threading device of a sewing machine according to claim 2 , wherein the narrow groove portion of the guiding path portion of the guiding member facing the needle hole of the needle disposed in the needle receiving portion has a width equal to or smaller than the width of the needle hole.

5. The threading device of a sewing machine according to claim 1 , wherein a position of a bottom of an opening of the guiding path portion of the guiding member is identical to a position of the lower end of the needle hole of the needle disposed in the needle receiving portion.

6. The threading device of a sewing machine according to claim 2 , wherein a position of a bottom of an opening of the guiding path portion of the guiding member is identical to a position of the lower end of the needle hole of the needle disposed in the needle receiving portion.

7. The threading device of a sewing machine according to claim 1 , wherein the threading shaft member movably supported on the sewing machine body in parallel to the needle bar is selectively rotatable to a position such that the needle receiving portion of the guiding member at the lower end of the guiding member will receive the needle attached to the needle bar when the needle bar is in a down position.

8. The threading device of a sewing machine according to claim 7 , wherein, when the needle attached to the needle bar is received by the needle receiving portion of the guiding member, the needle hole of the needle is aligned with an opening in a most narrow portion of the guiding path portion of the guiding member, such that a thread pushed along the guiding path will enter the needle hole of the needle.

9. The threading device of a sewing machine according to claim 8 , wherein, when the air supplying member supplies air to the guiding member as a jet of air that is expelled from the air supplying member and pushes the thread along the guiding path toward the needle hole of the needle in the needle receiving portion of the guiding member.

10. The threading device of a sewing machine according to claim 7 , wherein the needle and the thread that was passed through the needle hole are removed through the open upper surface of the guiding member by raising the needle bar to lift the needle upward out of the needle receiving portion of the guiding member and the thread that was threaded into the needle hole upward out of the open upper surface of the guiding member and then the threading shaft member is selectively rotated to a position that will not interfere with an up-down motion of the needle bar.

11. The threading device of a sewing machine according to claim 1 , where the air supplied to the guiding member is supplied by an air pump.

12. The threading device of a sewing machine according to claim 11 , wherein the air pump is operated electrically.

13. The threading device of a sewing machine according to claim 11 , wherein the air pump is operated manually by a user of the sewing machine.

14. A sewing apparatus that supports the threading device according to claim 1 , the sewing apparatus further comprising: a support mechanism for the needle bar; and a support for the threading shaft member which is movably supported on the sewing machine body in parallel to the needle bar.

15. A sewing machine that has mounted thereon the threading device according to claim 1 .

16. A method of threading a needle mounted on a sewing machine, the method comprising:
lowering a needle bar supported on a sewing machine body of the sewing machine so as to be slidable in an up-down direction, a needle having a needle hole being attached to a distal end of the needle bar, the needle bar being lowered so as to position a lower tip of the needle into a needle receiving portion of a guiding member mounted on the sewing machine; and
positioning a thread into an open upper surface of the guiding member, wherein the guiding member includes:
a guiding path portion of which a path width gradually narrows toward the needle hole of the attached needle such that air supplied from an air supplying member is guided toward the needle hole of the attached needle mounted on the needle bar, wherein an upper surface of the guiding path is open; and
the needle receiving portion which is formed continuously, within the guiding member, to the guiding path portion so as to determine a position of the needle hole,
wherein a jet of air is expelled from a tip of the air supplying member to push the positioned thread along the guiding path portion toward the needle and through the needle hole of the attached needle.

17. The method of threading a needle mounted on a sewing machine according to claim 16 , wherein the guiding path portion of the guiding member includes a linear narrow groove portion formed in the guiding path portion of the guiding member, and the needle receiving portion is formed continuously to the narrow groove portion, the method further comprising raising the needle bar so as to lift the needle as threaded upward and out of the needle receiving portion of the guiding member and to lift the thread that was threaded into the needle hole upward out of the open upper surface of the guiding member.

18. The method of threading a needle mounted on a sewing machine according to claim 17 , wherein the guiding member is mounted at a lower end of a threading shaft member which is movably supported on the sewing machine body in parallel to the needle bar, the method further comprising rotating the threading shaft member to a position that will not interfere with an up-down motion of the needle bar.

19. The method of threading a needle mounted on a sewing machine according to claim 16 , wherein the jet of air is provided from an air pump that is operated electrically.

20. The method of threading a needle mounted on a sewing machine according to claim 16 , wherein the jet of air is provided f

Assignees

• Janome Sewing Machine Co Ltd

Inventors

• Ebata Yoshikazu
• Ninomiya Masashi

Classifications

• D05D2207/04

  Suction or blowing devices · CPC title

• D05B87/02 Primary

  with mechanical means for moving thread through needle {or looper} eye · CPC title

• D05B81/00

  Sewing machines incorporating devices serving purposes other than sewing, e.g. for blowing air, for grinding · CPC title