Sewing control device and sewing machine

Patent metadata

Field	Value
Publication number	US-2021269953-A1
Application number	US-202017111241-A
Country	US
Kind code	A1
Filing date	Dec 3, 2020
Priority date	Feb 28, 2020
Publication date	Sep 2, 2021
Grant date	—

Abstract

A sewing control device includes in a sewing machine having upper feed function a control device which controls feed of an object to be sewn. A lower feed amount setting motor sets a feed amount of a lower feed dog and an upper feed amount change motor changes a feed amount of an upper feed dog. A feed execution range, in which the feed of the object to be sewn is executed by an appropriate feed amount while the object to be sewn is sandwiched between the lower feed dog and the upper feed dog, and a feed non-execution range, in which the feed of the object to be sewn is not executed in a state in which the feed dogs do not act on the object to be sewn, are present. The feed amount of the upper feed dog can be changed only in the feed non-execution range during sewing.

First claim

1 . A sewing control device comprising, in a sewing machine having upper feed function, a control device which controls feed of an object to be sewn, wherein a lower feed amount setting motor for setting a feed amount of a lower feed dog and an upper feed amount change motor for changing a feed amount of an upper feed dog are controllably configured, a feed execution range, in which the feed of the object to be sewn is executed by an appropriate feed amount while the object to be sewn is sandwiched between the lower feed dog and the upper feed dog, and a feed non-execution range, in which the feed of the object to be sewn is not executed in a state in which the lower feed dog and the upper feed dog do not act on the object to be sewn, are configured to be present, and the control device controls the upper feed amount change motor such that the feed amount of the upper feed dog can be changed only in the feed non-execution range during sewing.

2 . The sewing control device according to claim 1 , wherein a phase sensor which detects a timing of an upper feed operation is provided and the control device discriminates between the feed execution range and the feed non-execution range by the phase sensor.

3 . The sewing control device according to claim 1 , wherein a coupling unit which couples the lower feed dog and the upper feed dog is provided, and the upper feed amount change motor changes the upper feed amount by changing a link ratio of the coupling unit.

4 . The sewing control device according to claim 1 , wherein a sewing speed detection unit which detects a sewing speed, an operation amount detection unit of a knee operation device which receives an operation from an operator during sewing, and a cloth thickness detection unit which detect a thickness of the object to be sewn during sewing are provided, and the control device controls the upper feed amount change motor on the basis of a change of at least one of signals from the sewing speed detection unit, the operation amount detection unit of the knee operation device, and the cloth thickness detection unit.

5 . The sewing control device according to claim 2 , wherein a sewing speed detection unit which detects a sewing speed, an operation amount detection unit of a knee operation device which receives an operation from an operator during sewing, and a cloth thickness detection unit which detects a thickness of the object to be sewn during sewing are provided, and the control device controls the upper feed amount change motor on the basis of a change of at least one of signals from the sewing speed detection unit, the operation amount detection unit of the knee operation device, and the cloth thickness detection unit.

6 . The sewing control device according to claim 3 , wherein a sewing speed detection unit which detects a sewing speed, an operation amount detection unit of a knee operation device which receives an operation from an operator during sewing, and a cloth thickness detection unit which detects a thickness of the object to be sewn during sewing are provided, and the control device controls the upper feed amount change motor on the basis of a change of at least one of signals from the sewing speed detection unit, the operation amount detection unit of the knee operation device, and the cloth thickness detection unit.

7 . A sewing machine comprising the sewing control device according to claim 1 .

8 . A sewing machine comprising the sewing control device according to claim 2 .

9 . A sewing machine comprising the sewing control device according to claim 3 .

10 . A sewing machine comprising the sewing control device according to claim 4 .

11 . A sewing machine comprising the sewing control device according to claim 5 .

12 . A sewing machine comprising the sewing control device according to claim 6 .

13 . The sewing control device according to claim 2 , wherein a coupling unit which couples the lower feed dog and the upper feed dog is provided, and the upper feed amount change motor changes the upper feed amount by changing a link ratio of the coupling unit.

Assignees

• Janome Sewing Machine Co Ltd

Inventors

• Takei Tatsuo
• Bamba Yoshitaka
• Maeda Koji

Classifications

• D05D2205/04

  Pedals · CPC title

• D05B27/08

  with differential feed motions · CPC title

• D05B27/06 Primary

  arranged above and below the workpieces · CPC title

• D05B21/002

  consisting of lateral displacement of the workpieces by a feed-dog or a fluted presser foot · CPC title

• D05D2205/06

  Handles (joysticks D05D2205/08) · CPC title