Rotary shuttle device for sewing machine

A rotary shuttle device for a sewing machine, comprising an outer shuttle disposed at a driving shaft of a power generating unit of the sewing machine, a bobbin rotatably disposed in an inner shuttle so that an under thread is wound thereon, a bobbin case for receiving the bobbin and a bracket disposed around the outer shuttle, wherein the outer shuttle comprises:

• a main body integrally provided with a base portion disposed at the driving shaft, a first supporting portion which protrudes at one side of the base portion to have a first partial track groove on an inner face thereof, and a second supporting portion which protrudes at the other side of the base portion to be opposite the first supporting portion and having a second partial track groove on an inner face thereof;
• a track groove member removably disposed between the first and second supporting portion and having a third partial track groove in communication with the first partial track groove of the first supporting portion and the second partial track groove of the second supporting portion;
• and
• a groove member removably fixed to the second supporting portion of the main body, and having a pointed end, a groove through which the under thread wound on the bobbin passes while being contacted therewith and a fourth partial track groove in communication with the second partial track groove of the second supporting portion,
• wherein:
• the main body has a first locking groove provided at an end of the first supporting portion, a second locking groove provided at one end of the second supporting portion corresponding to the end of the first supporting portion, and a third locking groove provided at the other end of the second supporting portion,
• the track groove member having a first locking side provided at one end thereof to be removably coupled to the first locking groove of the first supporting member, and a second locking side formed at the other end thereof to be removably coupled to the second locking groove of the second supporting portion, and
• the groove member having a third locking side provided at an end thereof to be removably coupled to the third locking groove of the second supporting portion of the main body.

A rotary shuttle device for a sewing machine, comprising an outer shuttle disposed at a driving shaft of a power generating unit of the sewing machine, a bobbin rotatably disposed in an inner shuttle so that an under thread is wound thereon, a bobbin case for receiving the bobbin and a bracket disposed around the outer shuttle, wherein the outer shuttle comprises:

• a main body integrally provided with a base portion disposed at the driving shaft. a first supporting portion which protrudes at one side of the base portion to have a first partial track groove on an inner face thereof, and a second supporting portion which protrudes at the other side of the base portion to be opposite the first supporting portion and having a second partial track groove on an inner face thereof;
• a track groove member removably disposed between the first and second supporting portion and having a third partial track groove in communication with the first partial track groove of the first supporting portion and the second partial track groove of the second supporting portion;
• and
• a groove member removably fixed to the second supporting portion of the main body, and having a pointed end, a groove through which the under thread wound on the bobbin passes while being contacted therewith and a fourth partial track groove in communication with the second partial track groove of the second supporting portion,
• wherein:
• the main body has a first coupling portion formed at an end of the first supporting portion, a second coupling portion formed at one end of the second supporting portion corresponding to the end of the first supporting portion, and a third coupling portion formed at the other end of the second supporting portion, and the first, second and third coupling portions being respectively provided with a coupling hole,
• the track groove member having a first fastening portion provided at one end thereof, and a second fastening portion provided at the other end thereof, and the first fastening portion having a fastening hole in communication with the coupling hole of the first coupling portion of the first supporting portion and coupled to the coupling hole by a bolt, and the second fastening portion having a fastening hole in communication with the coupling hole of the second coupling portion of the second supporting portion and coupled to the coupling hole by the bolt, and
• the groove member having a third fastening portion formed at an end thereof, and the third fastening portion having a fastening hole in communication with the coupling hole of the third coupling portion of the second supporting portion and coupled to the coupling hole by the bolt.