Feed device for sewing machine
AssigneeYamato Mishin Seizo Kabushiki Kaisha
InventorHisao Fujii
Life of this patent
Estimating the term…
Abstract
A feed device for a sewing machine incorporates an upper feed dog above a throat plate and a lower feed dog below the throat plate and conveys material fabrics to a needle drop point by way of sandwiching the material fabrics between the upper and lower feed dogs. The feed device incorporates an energizing member for energizing the upper feed dog in the direction of the throat plate and controls the sandwiching force between the upper and lower feed dogs by constraining the energizing force generated by the energizing member.
Claims18
An upper feed apparatus for a sewing machine, comprising:
- an upper feed dog for executing an operation for feeding material fabrics;
- energizing means for generating an energizing force acting on said upper feed dog in the direction of the material fabrics;
- and
- adjustment means for adjusting the magnitude of the energizing force acting on said upper feed dog independently of the height of the upper feed dog.
An upper feed apparatus for a sewing machine, comprising:
- an operating rod;
- a feed body which is held by said operating rod;
- an upper feed dog connected to said feed body, wherein said upper feed dog executes an operation for feeding material fabrics;
- a bracket which is secured to said operating rod;
- a pair of screws which are respectively coupled with said bracket;
- and
- a coil spring which is inserted between one of said pair of screws and said feed body and energizes said upper feed dog in the direction of the material fabrics;
- wherein the energizing force generated by said coil spring is controlled by adjusting the screwing length of at least one of said pairs of screws.
A feed device for a sewing machine for feeding material fabrics to a needle drop point, comprising:
- a lower feed dog which is provided below a throat plate;
- an upper feed dog which is provided above the throat plate;
- energizing means for generating an energizing force acting on said upper feed dog in the direction of the throat plate;
- and
- adjustment means for adjusting the magnitude of the sandwiching force between said upper and lower feed dogs by controlling the energizing force acting on said upper feed dog independently of the height of the upper feed dog.
An upper feed apparatus for a sewing machine, comprising:
- an operating rod;
- an upper feed member pivotably mounted on said operating rod, wherein said upper feed member executes an operation for feeding material fabrics;
- a bracket which is secured to said operating rod;
- a pair of screws which are respectively coupled with said bracket;
- and
- adjustable energizing means, inserted between one of said pair of screws and said upper feed member, for energizing said upper feed member in the direction of the material fabrics.
Dependencies are inferred from the claim text.