Sewing machine
AssigneeJuki Corporation
InventorsAtsushi Shiraishi, Naofumi Fukuba, Daishi Kuramashi
Life of this patent
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Abstract
A sewing machine includes a movement amount detector which is configured to detect a movement amount of a workpiece, a motor which is a rotation driving source of an upper shaft configured to provide a vertical motion to a needle bar, and a control device which is configured to control the motor based on detection of the movement amount detector to maintain a constant stitch length. The movement amount detector is supported to be capable of being raised and lowered around a stitch position. The sewing machine includes a pressing unit configured to provide an upward elastic force such that a detection surface of the movement amount detector protrudes from an upper surface of a throat plate.
Claims6
A sewing machine comprising:
- a movement amount detector which is configured to detect a movement amount of a workpiece;
- a motor which is a rotation driving source of an upper shaft configured to provide a vertical motion to a needle bar;
- and
- a control device which is configured to control the motor based on detection of the movement amount detector to maintain a constant stitch length,
- wherein the movement amount detector is a two-dimensional image sensor,
- wherein the movement amount detector is supported in a throat plate to be capable of being raised and lowered within the throat plate around a stitch position, the sewing machine further comprising:
- a pressing unit disposed beneath the movement amount detector and configured to provide an upward elastic force such that a detection surface of the movement amount detector protrudes from an upper surface of the throat plate.
Dependencies are inferred from the claim text.