Sewing machine
AssigneeJanome Sewing Machine Co., Ltd.
InventorsShuzo MORIMOTO, Jun MAFUNE
Life of this patent
Estimating the term…
Abstract
A needle bar 4 is supported by a needle bar supporter in a manner freely movable up and down relative to a frame. A crank 2 is fixed to an upper shaft 1, rotates with the upper shaft 1, and an output end thereof moves circularly. A crank rod 3 is connected to the crank 2 in a freely rotatable manner. A connection rod 8 is connected to an intermediate portion of the crank rod 3 in a freely rotatable manner, and is connected to the needle bar 4 in a freely rotatable manner. A length of the needle bar 4 and a length from a connecting position of the connection rod 8 and the crank rod 3 to a slider 7 differ. When the crank 2 circularly moves, the connecting position of the connection rod 8 and the crank rod 3 draws a trajectory of an ellipse.
Claims9
A sewing machine comprising:
- a needle bar supported by a needle bar supporter in a manner freely movable up and down relative to a frame;
- an upper shaft supported in a direction horizontal to the frame, and rotated by a motor;
- a crank fixed to the upper shaft, and having an output end that rotates;
- a crank rod having an input end connected to the output end of the crank in a freely rotatable manner;
- a slider provided to an output end of the crank rod in a manner freely movable up and down relative to the frame;
- and
- a connection rod having an input end connected to an intermediate portion between the input end of the crank rod and the output end of the crank rod in a freely rotatable manner, and having an output end connected to the needle bar in a freely rotatable manner,
- wherein a length of the needle bar and a length from a connecting position of the connection rod and the crank to the slider differ.
Dependencies are inferred from the claim text.