Sewing machine clutch with removable locking pin
First Claim
1. A system for selectively securing a flywheel to a driveshaft, the driveshaft including a flange having an aperture, the flywheel having an aperture aligned with the flange aperture, the flywheel and driveshaft being held in an engaged relationship by the locking pin inserted into the flange aperture and the flywheel aperture when the apertures are aligned, the driveshaft further including a central aperture for receiving a retaining knob, the retaining knob retaining the flywheel on the driveshaft, the retaining knob including an aperture sized to receive the locking pin when the locking pin is not being used to engage the flywheel and the driveshaft.
1 Assignment
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Accused Products
Abstract
A sewing machine having a locking pin clutch mechanism allowing the user to selectively engage the flywheel or balance wheel for transmitting power to the main drive shaft. The locking pin may also have a line of weakness to function as a shear pin. The locking pin may be removable from the flywheel, and the flywheel retaining locking knob may include an aperture for storing the locking pin. In alternate embodiments, the locking pin may be held captive in the flywheel when the clutch is disengaged.
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Citations
23 Claims
- 1. A system for selectively securing a flywheel to a driveshaft, the driveshaft including a flange having an aperture, the flywheel having an aperture aligned with the flange aperture, the flywheel and driveshaft being held in an engaged relationship by the locking pin inserted into the flange aperture and the flywheel aperture when the apertures are aligned, the driveshaft further including a central aperture for receiving a retaining knob, the retaining knob retaining the flywheel on the driveshaft, the retaining knob including an aperture sized to receive the locking pin when the locking pin is not being used to engage the flywheel and the driveshaft.
- 7. A sewing machine including a main driveshaft having a flange, a flywheel selectively engaged to the main driveshaft, the flywheel providing rotational force to the main driveshaft when engaged to the main driveshaft by a locking pin inserted into an aperture in the flange and an aperture in the flywheel when the apertures are aligned, the flywheel being free to rotate with respect to the main driveshaft when the locking pin is removed, wherein the main driveshaft includes an aperture for receiving a retaining knob, the retaining knob including an aperture for receiving the locking pin when the locking pin is removed from the flywheel aperture.
- 9. A sewing machine including a main driveshaft having a flange, a flywheel selectively engaged to the main driveshaft, the flywheel providing rotational force to the main driveshaft when engaged to the main driveshaft by a locking pin inserted into an aperture in the flange and an aperture in the flywheel when the apertures are aligned, the flywheel being free to rotate with respect to the main driveshaft when the locking pin is removed wherein the flange is a bushing placed about the driveshaft and secured to the driveshaft to prevent rotation relative to the driveshaft, and the bushing includes a flange portion and a portion narrower than the flange, the flywheel being placed about the narrower portion.
- 18. A sewing machine including a main driveshaft, a bushing attached to the main drive shaft, the bushing having a flange, a flywheel selectively engaged with the bushing, the flywheel providing rotational force to the main driveshaft when engaged to the bushing by a locking pin inserted into an aperture in the flange and an aperture in the flywheel when the apertures are aligned, the flywheel being free to rotate with respect to the main driveshaft when the locking pin is removed from the aperture in the flange.
Specification