The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 2026
Filed:
Jul. 18, 2025
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Yasunori Suzuki, Nagoya, JP;
Kentaro Torii, Nagoya, JP;
Shinya Fujihara, Obu, JP;
Yoshihiro Minematsu, Nagoya, JP;
Masashi Tokura, Nagoya, JP;
Kazuki Kurokawa, Nagoya, JP;
BROTHER KOGYO KABUSHIKI KAISHA, Nagoya, JP;
Abstract
A controller performs a free motion sewing operation of driving a sewing machine motor to move a needle bar up and down in a state where an upper end of a feed dog is located below a needle plate. The controller performs a thread tension control operation of, while performing the free motion sewing operation, controlling an actuator to adjust a length of a spring during a first period to a first length and to adjust the length of the spring during a second period to a second length shorter than the first length. The first period is at least part of a needle up period in which a lower end of a sewing needle is located above the needle plate. The second period includes at least part of a needle down period in which the lower end of the sewing needle is located below the needle plate.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile