Sewing machine
AssigneeJanome Sewing Machine Co., Ltd.
InventorsShuzo Morimoto, Jun Mafune
Life of this patent
Estimating the term…
Abstract
A sewing machine moves a needle up and down relative to a cloth based on drive force from a rotating upper shaft to form a stitch. A first output generating unit reciprocates a first output point along an output axis so as to convert the rotational motion of the upper shaft into a linear motion. An assist rod that serves as a connection portion links the first output point with a needle bar. A needle-bar swing unit swings the needle bar. An output shaft moving unit moves a guide that is the output axis in a cloth feeding direction in accordance with the motion of the needle-bar swing unit. The assist rod changes the inclination in accordance with the movement of the output axis, and reciprocates the needle bar in substantially parallel with the output axis while maintaining the inclination.
Claims5
A sewing machine that moves, relative to a cloth, a needle attached to a needle bar up and down based on drive force from a rotating upper shaft to form a stitch, the sewing machine comprising:
- a needle-bar swing unit swinging the needle bar in an orthogonal direction to a cloth feeding direction;
- a first output generating unit reciprocating a first output point along an output axis that swings in accordance with a swing operation of the needle by the needle-bar swing unit;
- a link unit linking the first output point with the needle bar;
- and
- an output axis moving unit moving the output axis in the cloth feeding direction in accordance with an operation of the needle-bar swing unit,
- wherein the first output generating unit comprises:
- a crank provided at the upper shaft;
- a crank rod having one end connected with the crank and other end serving as the first output point;
- and
- an assist rod connected to the other end of the crank rod so as to be freely rotatable, and
- the link unit changes an inclination in accordance with the movement of the output axis, and moves up and down the needle bar in substantially parallel with the output axis while maintaining the inclination.
Dependencies are inferred from the claim text.