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US 4,398,481 AGranted
Zigzag mechanism for a sewing machine
AssigneeHusqvarna Aktiebolag
InventorLars-Erik Gustavsson
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AssigneeHusqvarna Aktiebolag
InventorLars-Erik Gustavsson
Estimating the term…
A frame of a needle bar mechanism is mounted in a sewing machine arm and supports the swingable needle bar holder to enable zigzag motion of the needle. A stepping motor is mounted in the frame and connected by a link from the shaft of the motor to the needle bar holder. The motor is controlled by stitch codes supplied by 8 amplifier circuits and automatic control devices. The link is formed so that the driving arrangement can be calibrated and an elastic engagement is provided between the motor shaft and the needle bar holder. The transfer distance through only one link is short so the friction loss is small. This, in combination with a small holding torque of the needle bar, restricts the dimension of the stepping motor.
In a zigzag mechanism for a sewing machine wherein a needle bar holder is mounted to be laterally swingable, a stepping motor has a gear, and coupling means are provided between the gear and the needle bar holder to swing the needle bar holder about its swinging axis, thereby to enable zigzag sewing;
Dependencies are inferred from the claim text.