Sewing device and looper positioning method

Patent metadata

Field	Value
Publication number	US-11834766-B2
Application number	US-202217676836-A
Country	US
Kind code	B2
Filing date	Feb 22, 2022
Priority date	Mar 26, 2021
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

There is provided a sewing device comprising a needle and a looper, the sewing device including a rotation shaft that rotates the looper, and a set bolt that has a conical distal end and positions the looper in an axial direction relative to the rotation shaft from a radial direction of the rotation shaft, in which the looper includes a through screw hole into which the set bolt is screwed, the rotation shaft includes a groove recessed from a peripheral surface of the rotation shaft, and the groove includes an inclined surface that the distal end of the set bolt contacts. In one aspect, in the sewing device, a cross section of the groove viewed in a direction along an axis of the rotation shaft has a V shape. As a result, a relative position between the needle and the looper can be positioned with significantly high accuracy.

First claim

What is claimed is:

1. A sewing device comprising a needle and a looper, the sewing device comprising:
a rotation shaft that rotates the looper: and
a set bolt that has a conical distal end and positions the looper in an axial direction relative to the rotation shaft from a radial direction of the rotation shaft, wherein
the looper includes a through screw hole into which the set bolt is screwed,
the rotation shaft includes a groove recessed from a peripheral surface of the rotation shaft, and
the groove includes an inclined surface that the conical distal end of the set bolt contacts.

2. The sewing device according to claim 1 , wherein a cross section of the groove viewed in a direction along an axis of the rotation shaft has a V shape.

3. The sewing device according to claim 1 , further comprising:
a mounting member that rotatably supports the rotation shaft to mount the looper,
wherein the conical distal end of the set bolt contacts the inclined surface so that the looper contacts a predetermined site of the mounting member.

4. The sewing device according to claim 1 , further comprising:
a mounting member that rotatably supports the rotation shaft to mount the looper, wherein
the conical distal end of the set bolt contacts the inclined surface so that he looper contacts a predetermined site of the mounting member,
the mounting member is fixed to a predetermined portion of the sewing device with a fixing bolt, and
an insertion hole into which the fixing bolt is inserted is a slotted hole extending in the axial direction of the rotation shaft.

5. The sewing device according to claim 1 , further comprising:
a mounting member that rotatably supports the rotation shaft to mount the looper, wherein
the conical distal end of the set bolt contacts the inclined surface so that the looper contacts a predetermined site of the mounting member,
the rotation shaft includes a protrusion protruding in the radial direction defined by the shaft, and
a recess corresponding to the protrusion is formed on a contact surface of the looper with the mounting member.

6. A looper positioning method for positioning, in a sewing device comprising a needle that reciprocates and a looper that rotates by a rotation shaft, the looper relative to the rotation shaft, the looper positioning method comprising:
a set bolt mounting step of mounting a set bolt having a conical distal end on a through screw hole formed in the looper toward the rotation shaft from its outer peripheral side; and
a position adjustment step of screwing the set bolt mounted on the through screw hole in the set bolt mounting step, adjusting a degree of screwing of the set bolt with the conical distal end contacting an inclined surface of a groove formed in the rotation shaft to be recessed from its peripheral surface, and adjusting a position of the looper relative to the rotation shaft.

7. The looper positioning method according to claim 6 , wherein in the position adjustment step; the set bolt is screwed until a boss in the looper contacts a predetermined contact surface of a mounting member that supports the rotation shaft.

8. The looper positioning method according to claim 6 , wherein
in the position adjustment step, the set bolt is screwed until a boss in the looper contacts a predetermined contact surface of a mounting member that supports tile rotation shaft,
further comprising an upper position adjustment step of displacing both the mounting member and the rotation shaft relative to a predetermined installation portion of the sewing device to positionally adjust the mounting member and the rotation shaft.

Assignees

• Honda Motor Co Ltd

Inventors

• Morimoto Taisuke
• Ikadai Yosuke
• Nakayama Kazuma
• Takamura Tohru

Classifications

• D05B1/06 Primary

  Single chain-stitch seams · CPC title

• D05B57/04

  rotary · CPC title

• D05B57/00 Primary

  Loop takers, e.g. loopers · CPC title

• D05B57/32 Primary

  in chain-stitch sewing machines · CPC title

• D05B57/30

  Driving-gear for loop takers · CPC title