A sewing machine needle clamp includes a seat and a threading element. The seat includes an assembly rod disposed at an upper portion, and an installation groove disposed at one side away from the assembly rod. The threading element includes an assembly section adhered in the installation groove, a threading section extended from the assembly section, and a plurality of thread holes disposed at the threading section. The hardness of the threading element is greater than the hardness of the seat to prevent the threading element from wear caused by sewing operations. In the sewing machine needle clamp of the present invention, the seat and the threading element are manufactured and formed separately, so as solve the issue of crookedness of machine needle holes caused by a thermal process in a conventional needle clamp.

A sewing machine needle clamp includes a seat and a threading element. The seat includes an assembly rod disposed at an upper portion, and an installation groove disposed at one side away from the assembly rod. The threading element includes an assembly section adhered in the installation groove, a threading section extended from the assembly section, and a plurality of thread holes disposed at the threading section. The hardness of the threading element is greater than the hardness of the seat to prevent the threading element from wear caused by sewing operations. In the sewing machine needle clamp of the present invention, the seat and the threading element are manufactured and formed separately, so as solve the issue of crookedness of machine needle holes caused by a thermal process in a conventional needle clamp.

This sewing needle holding device (10) is provided with: a holder (24) which holds the base end side of a sewing needle (14) provided with, from the leading end side toward the base end side in the extension direction, a small diameter portion (16), an outer diameter varying portion (20a), and a large diameter portion (18); and a presser member (26) which is mounted to the holder (24). The holder (24) causes at least the small diameter portion (16) and the outer diameter varying portion (20a) of the sewing needle (14) to protrude from a holder leading-end surface (34). The presser member (26) has a counter portion (46) that faces the holder leading-end surface (34). The counter portion (46) has formed therein an insertion hole (50) through which the small diameter portion (16) can be inserted. At least a part of the insertion hole (50) is provided with a pressure-receiving surface (52) that comes into abutment with the outer diameter varying portion (20a).

This sewing needle holding device (10) is provided with: a holder (24) which holds the base end side of a sewing needle (14) provided with, from the leading end side toward the base end side in the extension direction, a small diameter portion (16), an outer diameter varying portion (20a), and a large diameter portion (18); and a presser member (26) which is mounted to the holder (24). The holder (24) causes at least the small diameter portion (16) and the outer diameter varying portion (20a) of the sewing needle (14) to protrude from a holder leading-end surface (34). The presser member (26) has a counter portion (46) that faces the holder leading-end surface (34). The counter portion (46) has formed therein an insertion hole (50) through which the small diameter portion (16) can be inserted. At least a part of the insertion hole (50) is provided with a pressure-receiving surface (52) that comes into abutment with the outer diameter varying portion (20a).

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.

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.

A needle mounting device mounts a punch needle for needle punching on a needle bar of a sewing machine. The needle mounting device includes an insertion portion, an engaging mechanism, and an affixing portion. The insertion portion has a bar shape and is configured to be inserted into a mounting portion provided in the needle bar for mounting a sewing needle. The engaging mechanism is able to engage with the needle bar at a different position from the insertion portion in an extension direction of the insertion portion. The affixing portion is configured to affix the punch needle.

A needle mounting device mounts a punch needle for needle punching on a needle bar of a sewing machine. The needle mounting device includes an insertion portion, an engaging mechanism, and an affixing portion. The insertion portion has a bar shape and is configured to be inserted into a mounting portion provided in the needle bar for mounting a sewing needle. The engaging mechanism is able to engage with the needle bar at a different position from the insertion portion in an extension direction of the insertion portion. The affixing portion is configured to affix the punch needle.

A sewing machine needle is attached, fixed or exchanged to a needle clamp firmly and easily. The needle clamp 5 for clamping the sewing machine needle 3 has an accommodating recessed part 7 which accommodates a needle shank 15 of the sewing machine needle, a clamp lever 19 which has a clamp arm 21 which engages to the needle shank, is freely opened and closed end is fixed to a clamp lever shaft 17 which is fitted loosely to an elongate hole 13b is bored at the needle clamp for the accommodating recessed part a needle clamp spring 23 which repels elastically the clamp lever to an outer direction of a straight line which links a central point N of the needle shank and a central point of the clamp lever shaft, and the cam 71 is provided in the needle clamp 5, and the cam follower 70 which engages to the cam 71 is provided in the clamp arm 21, and the elongate hole has three surfaces that the cam follower climbs over the cam and moves as the movement path of the clamp lever shaft which becomes a rotation center P of the clamp lever.

A sewing machine needle is attached, fixed or exchanged to a needle clamp firmly and easily. The needle clamp 5 for clamping the sewing machine needle 3 has an accommodating recessed part 7 which accommodates a needle shank 15 of the sewing machine needle, a clamp lever 19 which has a clamp arm 21 which engages to the needle shank, is freely opened and closed end is fixed to a clamp lever shaft 17 which is fitted loosely to an elongate hole 13b is bored at the needle clamp for the accommodating recessed part a needle clamp spring 23 which repels elastically the clamp lever to an outer direction of a straight line which links a central point N of the needle shank and a central point of the clamp lever shaft, and the cam 71 is provided in the needle clamp 5, and the cam follower 70 which engages to the cam 71 is provided in the clamp arm 21, and the elongate hole has three surfaces that the cam follower climbs over the cam and moves as the movement path of the clamp lever shaft which becomes a rotation center P of the clamp lever.