Sewing machine with threading device

Patent metadata

Field	Value
Publication number	US-11639570-B2
Application number	US-201917055374-A
Country	US
Kind code	B2
Filing date	Jun 13, 2019
Priority date	Jul 31, 2018
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

[Purpose] To obtain a sewing machine comprising a device with which it is possible to easily perform a threading operation in which a needle thread is inserted into the needle hole of the sewing machine needle, wherein the sewing machine comprises a threading device configured so that the needle thread does not drop onto or coil around an operation part (operation part) of the operation lever of the threading device when a thread-hooking operation is completed before insertion of the needle thread. [Configuration] The present invention comprises: a needle bar 52 ; a threading shaft 53 ; a thread-holding tool 71 ; a threading tool 72 provided at the bottom end of the threading shaft 53 ; an operation lever 4 that has an operation part 41 and moves the threading shaft 53 up and down and rotates the threading shaft in the circumferential direction; and a cutting tool 93 for the needle thread n. The present invention is configured such that a needle thread guide member A, in which an inclined part 1 is formed that guides the needle thread n from the thread-holding tool 71 to the cutting tool 93 , is provided between the thread-holding tool 71 and the cutting tool 93 , and the inclined part of the needle thread guide member A guides the needle thread n that has been cut by the cutting tool out of the operation range of the operation lever 4.

First claim

The invention claimed is:

1. A sewing machine equipped with a threading device, comprising: a needle bar to which a sewing machine needle is attached; a threading shaft supported such as to be movable up and down and rotatable in a circumferential direction; a thread holder provided at a lower end of the threading shaft; a threader provided at the lower end of the threading shaft and having a hook made to stick out through a needle hole to pass a thread through the needle hole; an operation lever having an operation part for operation and causing the threading shaft to move up and down and to rotate in the circumferential direction; a cutter for a top thread; and a top thread guide member provided between the thread holder and the cutter and formed with an inclined part that guides the top thread from the thread holder to the cutter, the inclined part of the top thread guide member being configured to guide the top thread that has been cut by the cutter to outside of an operation area of the operation lever.

2. The sewing machine equipped with a threading device according to claim 1 , wherein the inclined part of the top thread guide member is formed as an inclined surface that guides the top thread that is being threaded from the thread holder over to the cutter.

3. The sewing machine equipped with a threading device according to claim 2 , wherein the inclined surface has a side edge on a face plate side of a sewing machine body including a side edge portion located higher than the operation part, the side edge portion being inclined from a front side to a back side in Y-direction of the sewing machine body toward the face plate side in X-direction of the sewing machine body as viewed from above.

4. The sewing machine equipped with a threading device according to claim 3 , further comprising a plate-shaped auxiliary guide piece formed along X-direction at an end part on a front side in Y-direction of the inclined surface.

5. The sewing machine equipped with a threading device according to claim 2 , further comprising a plate-shaped auxiliary guide piece formed along X-direction at an end part on a front side in Y-direction of the inclined surface.

6. The sewing machine equipped with a threading device according to claim 1 , wherein the top thread guide member includes a vertical plate-shaped part having a circular arc curved surface and formed integrally to the operation lever with a longitudinal direction thereof extending along Y-direction.

7. The sewing machine equipped with a threading device according to claim 6 , wherein an auxiliary guide part is formed with an auxiliary slope from a column side to a face plate side along X-direction inclined to recede toward a back side in Y-direction.

Assignees

• Janome Sewing Machine Co Ltd
• Janome Corp

Inventors

• Azuma Toyohiro
• Sawada Takuya
• Maeda Koji

Classifications

• D05B87/02 Primary

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