Patent ID: 7536964
Filing Date: 2009-05-26
Classification: D05B

Abstract:
1. A sewing machine comprising: an upper looper formed with a thread hole at a tip portion thereof and disposed so as to be oscillatable; an upper looper shaft which oscillates the upper looper between an upper position and a lower position; switching means disposed in relation to the upper looper and the upper looper shaft such that the switching means is operable to switch a coupled state and a decoupled state between the upper looper and the upper looper shaft; moving means for moving the upper looper, which has been decoupled from the upper looper shaft by the switching means, to the lower position; a thread guiding pipe formed with a thread path through which an upper looper thread is insertable and having a thread discharging port, the thread guiding pipe being movable between a position, at which the thread discharging port is aligned with the thread hole of the upper looper in the lower position, and another position, at which the thread discharging port is moved away from the thread hole; and first operating means operable to decouple the upper looper and the upper looper shaft via the switching means, and to move the thread discharging port of the thread guiding pipe to the position at which the thread discharging port is aligned with the thread hole of the upper looper in the lower position.