Needle bar stopper for use in a sewing machine
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsYasuhiko Kawaguchi, Akio Takahashi, Masaki Shimizu, Minoru Sakanobe
Life of this patent
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Abstract
A needle bar stopper is provided in a sewing machine having a main shaft and a needle bar which moves vertically upon reception of a driving force from the main shaft. The needle bar stopper comprises a transmission prohibiting unit, including a needle bar stopping solenoid, which prohibits transmission of the driving force from the main shaft to the needle bar and a braking unit, including a needle bar stopping solenoid, which applies a braking force to the needle bar when transmission of the driving force is prohibited by the transmission prohibiting unit. The needle bar stopper can stop the needle bar reliably by use of the braking unit.
Claims18
A needle bar stopper for use in a sewing machine having a main shaft and a needle bar which moves vertically upon reception of a driving force from the main shaft, the needle bar stopper for stopping the needle bar comprising:
- a transmission prohibiting unit which prohibits transmission of the driving force from the main shaft to the needle bar;
- and
- a braking unit which applies a braking force to the needle bar when transmission of the driving force from the main shaft to the needle bar is prohibited, wherein the needle bar stopper further comprises a moving direction detector which detects the needle bar moving direction, and the braking unit is controlled to operate based on a result of detection by the moving direction detector.
A needle bar stopping mechanism for use in a sewing machine having a loop catcher, the needle bar stopping mechanism comprising:
- a needle bar having a linking pin;
- a needle bar drive mechanism having an engaging portion for selectively engaging the linking pin;
- a needle bar braking mechanism for applying a braking force to the needle bar;
- a synchronization detector for detecting asynchronous behavior between operation of the needle bar and the loop catcher;
- and
- a needle bar direction of movement sensor for determining a direction of movement of the needle bar.
A needle bar stopper for use in a sewing machine having a main shaft and a needle bar which moves vertically upon reception of a driving force from the main shaft, the needle bar stopper for stopping the needle bar comprising:
- transmission prohibiting means for probiting transmission of the driving force from the main shaft to the needle bar;
- and
- braking means for applying a braking force to the needle bar when transmission of the driving force from the main shaft to the needle bar is prohibited, wherein the braking means has a member having a high coefficient of friction that is pressed against the needle bar to apply a braking force.
Dependencies are inferred from the claim text.