Needle plate detachable mechanism and sewing machine having needle plate detachable mechanism
AssigneeJanome Sewing Machine Co., Ltd.
InventorsOsamu Yanagisawa, Hideo Suzuki, Shinichi Kato, Jun Mafune
Life of this patent
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Abstract
In order to prevent a replacement of the needle plate in the situation not suitable for replacing the needle plate, a needle plate detachable mechanism has a needle plate fixing unit for fixing a needle plate on a sewing machine body; a releasing unit for releasing a fixed state of the needle plate; and a fixing-release limiting unit for limiting a release of the fixed state of the needle plate when the needle is positioned below an upper surface of the needle plate or when the sewing machine motor is driven.
Claims7
A needle plate detachable mechanism of a sewing machine which forms a seam by vertically driving a needle by a driving force of a sewing machine motor, the needle plate detachable mechanism comprising:
- a needle plate fixing unit for fixing a needle plate on a sewing machine body;
- a releasing unit for releasing a fixed state of the needle plate;
- a fixing-release limiting unit for limiting a release of the fixed state of the needle plate
- a detector for detecting a vertical position of the needle;
- and
- a controller which is electrically connected with the sewing machine motor, the detector and the fixing-release limiting unit to determine an operation of the fixing-release limiting unit, wherein
- the controller operates the fixing-release limiting unit for limiting the release of the fixed state of the needle plate when a needle tip of the needle is positioned below an upper surface of the needle plate based on the vertical position of the needle detected by the detector, and
- the controller operates the fixing-release limiting unit for limiting the release of the fixed state of the needle plate when the sewing machine motor is driven.
Dependencies are inferred from the claim text.