Sewing machine
First Claim
Patent Images
1. A sewing machine comprising:
- a needle bar to which a sewing needle is secured;
a needle-bar drive motor which reciprocates said needle bar;
a hook;
a hook drive motor which rotates said hook;
a speed detector which detects a rotation speed of said needle-bar drive motor;
an information obtaining device which obtains information indicating that the rotation speed of said needle-bar drive motor will change; and
a control device which controls, based on the detected rotation speed of said needle-bar drive motor and the obtained information, said hook drive motor at least when the detected rotation speed of said needle drive motor is greater than a reference value so that said hook is rotated in synchronism with the reciprocation of said needle bar.
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Accused Products
Abstract
A sewing machine including a needle bar to which a sewing needle is secured, a needle-bar drive motor which reciprocates the needle bar, a hook, a hook drive motor which rotates the hook, a speed detector which detects a rotation speed of the needle-bar drive motor, an information obtaining device which obtains information indicating that the rotation speed of the needle-bar drive motor will change, and a control device which controls, based on the detected rotation speed of the needle-bar drive motor and the obtained information, the hook drive motor so that the hook is rotated in synchronism with the reciprocation of the needle bar.
18 Citations
16 Claims
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1. A sewing machine comprising:
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a needle bar to which a sewing needle is secured; a needle-bar drive motor which reciprocates said needle bar; a hook; a hook drive motor which rotates said hook; a speed detector which detects a rotation speed of said needle-bar drive motor; an information obtaining device which obtains information indicating that the rotation speed of said needle-bar drive motor will change; and a control device which controls, based on the detected rotation speed of said needle-bar drive motor and the obtained information, said hook drive motor at least when the detected rotation speed of said needle drive motor is greater than a reference value so that said hook is rotated in synchronism with the reciprocation of said needle bar. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification