Sewing machine
AssigneeJanome Sewing Machine Co., Ltd.
InventorMakoto NAKAJIMA
Life of this patent
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Abstract
The present invention provides a sewing machine that can actuary detect a physical amount of a movement of a fabric without depending on an estimated value. Thus, thread tension can be precisely adjusted. A sewing machine 1 includes a spherical body 22a exposed partly from a needle plate 2. The spherical body 22a is rotated following a feed of a fabric 100. The rotation of the spherical body 22a is detected by rotary encoders 22c, 22d. A physical amount of the movement of the fabric 100 is calculated based on a detection result of the rotary encoders 22c, 22d. The physical amount of the movement of the fabric 100 is, for example, a moving amount and a moving speed.
Claims7
A sewing machine for forming stitches on a fabric by passing a needle through the fabric to interlace an upper thread and a lower thread with each other, comprising:
- a needle plate on which the fabric is placed;
- a spherical body that is exposed partly from the needle plate, the spherical body being rotated following a feed of the fabric;
- an encoder that detects a rotation of the spherical body;
- and
- a calculator that calculates a physical amount of a movement of the fabric based on a detection result of the encoder.
Dependencies are inferred from the claim text.