Patent ID: 8640637
Filing Date: 2014-02-04
Classification: D05B,D05D

Abstract:
1. A sewing-machine bobbin thread tension controller, comprising: an outer shuttle that has a circular-arc inner peripheral surface and includes a guide groove formed on a front side which is one side of the inner peripheral surface in an axial direction; a middle shuttle that rotates along the guide groove of the outer shuttle, to thus hook a needle thread, and that includes a middle shuttle presser that is provided on a front side of the outer shuttle in order to prevent the middle shuttle accommodated in the outer shuttle from falling from the outer shuttle; a bobbin that has a hole through which the shaft of the middle shuttle passes, that is axially supported in the middle shuttle as a result of the shaft being inserted into the hole, and that has a first magnet provided on a rear surface which is a surface opposing a rear portion of the middle shuttle when the bobbin is axially supported by the shaft; and a bobbin thread tension control mechanism that includes