Sewing machine

Patent metadata

Field	Value
Publication number	US-10465321-B2
Application number	US-201715404602-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Jan 14, 2016
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A sewing machine includes a sewing machine motor serving as a drive source for driving the vertical movement of a needle bar, a control part for controlling the sewing machine motor such that a sewing pitch coincides with a set value, and imaging part for imaging a seam formed in a workpiece at a needle drop position. The control part obtains the length of the most recent seam from an image of the most recent seam imaged by the imaging part and also compares the length of the most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

First claim

The invention claimed is:

1. A sewing machine, comprising: a sewing machine motor serving as a drive source for driving the vertical movement of a needle bar; and, a control part for controlling the sewing machine motor such that a sewing pitch coincides with a set value, wherein, there is further included an imaging part for imaging a seam formed in a workpiece at a needle drop position, and the control part obtains the length of a most recent seam formed in the workpiece from an image of the most recent seam imaged by the imaging part and also compares the length of the most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

2. The sewing machine according to claim 1 , wherein the imaging part includes multiple imaging devices having different imaging ranges with respect to the workpiece and being arranged around the needle bar.

3. The sewing machine according to claim 1 , wherein the imaging part includes multiple imaging devices having different imaging ranges with respect to the workpiece, and wherein the control part obtains the moving direction of the workpiece from images of the workpiece imaged by the multiple imaging devices, selects one of the multiple imaging devices according to the thus-obtained moving direction, obtains the length of the most recent seam from the image imaged by the selected imaging devices, and compares the length of the most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

4. The sewing machine according to claim 2 , wherein the control part obtains the moving direction of the workpiece from the images of the workpiece imaged by the multiple imaging devices, composes the images of the most recent seam imaged by the multiple imaging devices to obtain the length of the most recent seam, and compares the length of the most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

5. The sewing machine according to claim 3 , wherein the control part obtains the moving direction of the workpiece from the image of the workpiece imaged by any one of the multiple imaging devices.

6. The sewing machine according to claim 4 , wherein the control part obtains the moving direction of the workpiece from the image of the workpiece imaged by any one of the multiple imaging devices.

7. The sewing machine according to claim 1 , wherein the control part obtains the moving direction of the workpiece from the image of the workpiece imaged by the imaging part, according to the thus-obtained moving direction, identifies from multiple seams imaged by the imaging part a seam extending along the moving direction as the most recent seam, and compares the length of the identified most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

8. The sewing machine according to claim 2 , wherein the control part obtains the moving direction of the workpiece from the image of the workpiece imaged by the imaging part, according to the thus-obtained moving direction, identifies from multiple seams imaged by the imaging part a seam extending along the moving direction as the most recent seam, and compares the length of the identified most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

9. The sewing machine according to claim 3 , wherein the control part obtains the moving direction of the workpiece from the images of the workpiece imaged by the multiple imaging devices, according to the thus-obtained moving direction, identifies from multiple seams imaged by the multiple imaging devices a seam extending along the moving direction as the most recent seam, and compares the length of the identified most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

10. The sewing machine according to claim 4 , wherein the control part obtains the moving direction of the workpiece from the images of the workpiece imaged by the multiple imaging devices, according to the thus-obtained moving direction, identifies from multiple seams imaged by the multiple imaging devices a seam extending along the moving direction as the most recent seam, and compares the length of the identified most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

11. The sewing machine according to claim 5 , wherein the control part obtains the moving direction of the workpiece from the images of the workpiece imaged by the multiple imaging devices, according to the thus-obtained moving direction, identifies from multiple seams imaged by the multiple imaging devices a seam extending along the moving direction as the most recent seam, and compares the length of the identified most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

12. The sewing machine according to claim 6 , wherein the control part obtains the moving direction of the workpiece from the images of the workpiece imaged by the multiple imaging devices, according to the thus-obtained moving direction, identifies from multiple seams imaged by the multiple imaging devices a seam extending along the moving direction as the most recent seam, and compares the length of the identified most recent seam with the set value of the sewing pitch to thereby correct the number of rotations of the sewing machine motor.

Assignees

• Juki Kk

Inventors

• Yoshida Junichi
• Sugiyama Toshiki

Classifications

• D05B69/18

  electric {, e.g. foot pedals} · CPC title

• D05B19/14 Primary

  Control of needle movement, e.g. varying amplitude or period of needle movement · CPC title

• D05B69/26

  with automatic means to reduce speed of drive, e.g. in one or more steps · CPC title

• D05B19/08

  Arrangements for inputting stitch or pattern data to memory {; Editing stitch or pattern data} · CPC title