Sewing machine

Patent metadata

Field	Value
Publication number	US-11214903-B2
Application number	US-201916692419-A
Country	US
Kind code	B2
Filing date	Nov 22, 2019
Priority date	Nov 30, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A sewing machine includes a thread cutter. The thread cutter includes a cutter blade having a blade edge configured to cut a thread, and a movable member. The movable member includes a guide having a guide surface adjacent to the cutter blade. The guide is configured to receive force from the thread at the guide surface during the course of cutting the thread with the cutter blade and to move in a moving direction which is a longitudinal direction of the blade edge.

First claim

What is claimed is:

1. A sewing machine, comprising:
a thread cutter including:
a cutter blade having a blade edge configured to cut a thread; and
a movable member including a guide having a guide surface adjacent to the cutter blade, the guide being configured to receive force from the thread at the guide surface during the course of cutting the thread with the cutter blade by slidably moving the thread in a longitudinal direction of the blade edge and to move in a moving direction which is the longitudinal direction of the blade edge,
wherein the movable member includes a wire having elasticity and the guide is configured to move in the moving direction by being elastically deformed by the force received from the thread.

2. The sewing machine according to claim 1 , further comprising:
a needle plate; and
a feed unit configured to feed a workpiece placed on the needle plate in a feed direction,
wherein the guide surface is located closer to a downstream end of the needle plate in the feed direction than the cutter blade.

3. The sewing machine according to claim 1 , further comprising a needle plate having a needle hole,
wherein the guide surface is located closer to the needle hole than the cutter blade.

4. The sewing machine according to claim 1 , wherein when the guide surface and the blade edge of the cutter blade are projected onto a plane perpendicular to a thickness direction of the cutter blade, the guide surface crosses the blade edge, such that the guide surface and the blade edge define an acute angle.

5. The sewing machine according to claim 4 , wherein a portion of the guide surface closest to the blade edge is located upstream, in the moving direction, of a center of an exposed portion of the cutter blade in the longitudinal direction of the blade edge, the center of the exposed portion being exposed to an exterior of the sewing machine.

6. The sewing machine according to claim 1 , further comprising a horizontal arm including a face plate that covers an end portion of the sewing machine,
wherein the thread cutter is fixed at a fixing surface of the horizontal arm, and
wherein the guide is configured to elastically move in the longitudinal direction of the blade edge toward the horizontal arm based on the reception of the force from the thread.

7. The sewing machine according to claim 6 , wherein an angle defined by the blade edge and the face plate is an acute angle.

8. The sewing machine according to claim 6 , further comprising:
a protrusion protruding from the fixing surface in a direction in which the horizontal arm is elongated, and
a portion of the guide overlaps with the protrusion in a direction parallel to the face plate and perpendicular to a thickness direction of the cutter blade.

9. The sewing machine according to claim 4 , wherein when the guide surface is projected onto the plane perpendicular to the thickness direction of the cutter blade, the guide surface has an arch shape.

10. The sewing machine according to claim 9 , wherein the arch shape is convexly curved in a direction opposite to the moving direction.

11. The sewing machine according to claim 10 , wherein the movable member has a first end portion that is fixed at a head of a horizontal arm of the sewing machine and a second end portion that is a free end.

12. The sewing machine according to claim 11 , wherein the first end portion of the movable member is fixed such that the second end portion is urged toward the cutter blade in the thickness direction of the cutter blade.

13. A sewing machine, comprising:
a horizontal arm; and
a thread cutter fixed at a fixing surface of the horizontal arm, the thread cutter including:
a cutter blade having a blade edge configured to cut a thread; and
a movable member including a guide having a guide surface adjacent to the cutter blade, the guide being configured to move in a moving direction which is a longitudinal direction of the blade edge,

wherein the guide is configured to elastically move in the longitudinal direction of the blade edge toward the horizontal arm, and
wherein an angle defined by the blade edge and the fixing surface is an acute angle.

Assignees

• Brother Ind Ltd

Inventors

• Uyama Yoshiyuki
• Kato Masahisa

Classifications

• D05B73/12

  Slides; Needle plates · CPC title

• D05B65/003 Primary

  the thread being engaged manually against the cutting edge of a fixedly arranged knife · CPC title