Sewing machine
AssigneeSuzuki Manufacturing, Ltd.
InventorsTohru Sakuma, Mitsuru Sato
Life of this patent
Estimating the term…
Abstract
Provided is a sewing machine that can be reduced in size by employing a simple configuration for a feed dog drive device. A lateral feed drive unit (8) and a vertical drive unit (9) transmit rotation of a drive shaft (7) to a feed dog (3). The feed dog (3) is supported by a swingable feed base (5). A square piece (18) is provided at a lower end of a raising and lowering link (15) of the vertical drive unit (9). A guide member (19) including a guide groove (20) configured to guide the square piece (18) is disposed right under the feed base (5). An upper end of the raising and lowering link (15) is connected to a part of the feed base (5) between the swinging shaft (6) and the feed dog (3).
Claims4
A sewing machine comprising:
- a feed dog configured to project from and retract into a top surface of a throat plate;
- a presser foot facing an upper side of the feed dog;
- a press operation lever configured to separate the presser foot from and bring the presser foot into press contact with the feed dog in conjunction with lifting and lowering operations;
- and
- a feed dog drive device configured to drive the feed dog, the feed dog drive device including,
- a feed connecting rod having a distal end that supports the feed dog, the feed connecting rod extending in a lateral direction,
- a feed base configured to support the feed connecting rod movably in a longitudinal direction of the feed connecting rod,
- a swinging shaft configured to swingably support a base end of the feed base such that the feed dog provided in the distal end of the feed connecting rod is movable in an up-down direction,
- a drive shaft via which power from a drive source is transmitted,
- a lateral feed drive unit configured to convert rotation of the drive shaft into lateral feed motion and transmit the lateral feed motion to the feed dog, and
- a vertical drive unit configured to convert rotation of the drive shaft into vertical motion and transmit the vertical motion to the feed dog, wherein:
- the drive shaft is disposed below the feed base:
- the vertical drive unit includes,
- an eccentric cam configured to be rotated by the drive shaft,
- an advance and retreat arm configured to advance and retreat in the lateral direction by the eccentric cam,
- a raising and lowering link having a lower end connected to the advance and retreat arm via a lower-part connecting shaft, and an upper end connected to the feed base via an upper-part connecting shaft,
- a square piece provided coaxially with the lower-part connecting shaft of the raising and lowering link,
- a guide member having a guide groove by which the square piece is linearly guided,
- a pivot shaft configured to turnably support the guide member, and
- a guide member pivot mechanism configured to change a moving distance of the feed dog in a state projecting from the throat plate by changing an inclination angle of the guide groove by turning the guide member;
- the guide member is disposed on one side from the drive shaft and right under the feed base;
- and
- the raising and lowering link is connected to a part of the feed base between the swinging shaft and the feed dog.
Dependencies are inferred from the claim text.