Sewing machine

Patent metadata

Field	Value
Publication number	US-10415167-B2
Application number	US-201614986803-A
Country	US
Kind code	B2
Filing date	Jan 4, 2016
Priority date	Jan 7, 2015
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A sewing machine, in which a presser foot and a throat plate are detachable, includes a feed dog bracket, a feeding dog and a mounting portion. The feed dog bracket is driven according to a transfer direction of a fabric. The feeding dog transfers the fabric on the throat plate. The mounting portion detachably mounts the feeding dog on the feed dog bracket. The feeding dog includes a cam portion which is mounted on the mounting portion. The cam portion includes first, second and third cam surfaces. The first cam surface has a surface-contact with a first receiving surface of the mounting portion. The second cam surface has a line-contact with an end portion of a second receiving surface of the mounting portion. The third cam surface is pressed by a pressing member of the mounting portion.

First claim

What is claimed is:

1. A sewing machine in which a presser foot and a throat plate are detachable in accordance with a stitch pattern, the sewing machine comprising:
a feed dog bracket that is driven according to a transfer direction in which a fabric is transferred;
a feeding dog that transfers the fabric on the throat plate; and
a mounting portion that detachably mounts the feeding dog on the feed dog bracket,
wherein the feeding dog includes a cam portion which is mounted on the mounting portion, and
wherein the mounting portion includes:
a planar first receiving surface and a second receiving surface on which the cam portion is inserted and which are formed in positions opposing to each other; and
a pressing member which presses the inserted cam portion which is inserted between the first and second receiving surfaces, in an insertion direction, and wherein the cam portion includes:
a first cam surface which is a planar surface, which has a planar, surface-contact with the planar first receiving surface such that the feeding dog is maintained horizontal, and which is configured to slide on the planar first receiving surface;
a second cam surface which has a line-contact with an end portion of the second receiving surface in a direction perpendicular to the insertion direction in which the cam portion is inserted and which is an inclined surface with respect to the first cam surface; and
a third cam surface which is pressed by the pressing member,
wherein between the first cam surface and the second cam surface is a continuous surface having an arc shape section.

2. The sewing machine according to claim 1 , wherein a direction in which the pressing member presses the third cam surface is divided into a pressing direction in which the first cam surface presses the first receiving surface and the insertion direction in which the cam portion is inserted between the first and second receiving surfaces.

3. The sewing machine according to claim 1 , wherein the cam portion is arranged at an end portion of the feeding dog in the insertion direction.

4. The sewing machine according to claim 2 , wherein the cam portion is arranged at an end portion of the feeding dog in the insertion direction.

5. The sewing machine according to claim 1 , wherein the insertion direction of the cam portion is parallel to a direction in which the fabric is transferred by the feeding dog.

6. The sewing machine according to claim 2 , wherein the insertion direction of the cam portion is parallel to a direction in which the fabric is transferred by the feeding dog.

7. The sewing machine according to claim 1 , wherein the mounting portion includes a positioning member which positions the feeding dog on the mounting portion, in a direction which is parallel to the first receiving surface and which is intersected with the insertion direction.

8. The sewing machine according to claim 2 , wherein the mounting portion includes a positioning member which positions the feeding dog on the mounting portion, in a direction which is parallel to the first receiving surface and which is intersected with the insertion direction.

9. The sewing machine according to claim 1 , wherein the continuous surface is formed at an end portion of the first cam surface in the insertion direction.

10. The sewing machine according to claim 2 , wherein the continuous surface is formed at an end portion of the first cam surface in the insertion direction.

11. The sewing machine according to claim 1 , wherein the pressing member includes a pressure contact portion which presses the third cam surface, and
wherein the cam portion has further includes a second continuous surface between the first cam surface and the third cam surface, the second continuous surface having an arc shaped section.

12. The sewing machine according to claim 2 , wherein the pressing member includes a pressure contact portion which presses the third cam surface, and
wherein the cam portion has further includes a second continuous surface between the first cam surface and the third cam surface, the second continuous surface having an arc shaped section.

13. The sewing machine according to claim 11 , wherein the pressing member is a spring member which has the pressure contact portion.

14. The sewing machine according to claim 12 , wherein the pressing member is a spring member which has the pressure contact portion.

15. The sewing machine according to claim 11 , wherein the pressing member is a latch mechanism which has the pressure contact portion.

16. The sewing machine according to claim 12 , wherein the pressing member is a latch mechanism which has the pressure contact portion.

17. The sewing machine according to claim 1 , wherein the pressing member is a lever member which switches a position where the pressing member presses the third cam surface and a position where the pressing member is retreated from the third cam surface.

18. The sewing machine according to claim 2 , wherein the pressing member is a lever member which switches a position where the pressing member presses the third cam surface and a position where the pressing member is retreated from the third cam surface.

Assignees

• Juki Kk

Inventors

• Fukuba Naofumi
• Kuramashi Daishi

Classifications

• D05B27/08

  with differential feed motions · CPC title

• D05B27/02

  with feed dogs having horizontal and vertical movements · CPC title

• D05B29/12 Primary

  Presser-foot attachment · CPC title

• D05B27/04 Primary

  arranged above the workpieces · CPC title

• D05D2209/08

  elastic, e.g. rubber spring · CPC title