Sewing machine
AssigneeSuzuki Manufacturing, Ltd.
InventorMitsuru Sato
Life of this patent
Estimating the term…
Abstract
Provided is a sewing machine capable of positioning feed dogs with a sufficient distance below the upper surface of a throat plate when the feed dogs are retracted. Feed dogs 3 protrude and retract from a throat plate 1. A horizontal feed drive unit 8 converts the rotation of a drive shaft 7 into a reciprocating motion in the horizontal direction and transmits the horizontal reciprocating motion to the feed dogs 3. A vertical drive unit 9 converts the rotation of the drive shaft 7 into a reciprocating motion in the vertical direction and transmits the vertical reciprocating motion to the feed dogs 3. A vertical position changing part moves turn-back points P at both ends of a forward path and a return path when the feed dogs 3 reciprocate in the horizontal direction below the throat plate 1.
Claims2
A sewing machine comprising:
- feed dogs which protrude and retract from an upper surface of a throat plate;
- a presser foot which faces a top of the feed dogs;
- a drive shaft which transmits power of a drive source;
- a horizontal feed drive unit which converts a rotation of the drive shaft into a reciprocating motion in a horizontal direction and transmits the reciprocating motion in the horizontal direction to the feed dogs;
- a vertical drive unit which converts the rotation of the drive shaft into a reciprocating motion in a vertical direction and transmits the reciprocating motion in the vertical direction to the feed dogs;
- a vertical travel distance changing part which changes a reciprocating travel distance of the feed dogs in the vertical direction;
- and a vertical position changing part which moves turn-back points at both ends of a forward path and a return path at the time of a horizontal reciprocating travel of the feed dogs to be below the upper surface of the throat plate in a case where the vertical travel distance changing part decreases a vertical travel distance of the feed dogs.
Dependencies are inferred from the claim text.