Patent ID: 6776111
Filing Date: 2004-08-17
Classification: D05B

Abstract:
A bobbin case of a rotary shuttle device for a sewing machine, in which a bobbin for winding an under thread is rotatably disposed, comprising;a main body integrally provided with a body, and a side portion downwardly bent at a side of the body to form a thick portion at which a fixing hole and an adjusting hole is formed, and a thick portion at which a first and second supporting hole and a supporting piece for supporting and guiding the under thread are formed, the first and second supporting portions being divided by a boundary portion which is formed with a discharging hole for discharging the under thread pulled out of a bobbin from an inner portion of the side portion to an outside; a guide member formed with a coupling hole and a controlling hole which corresponds to the fixing hole and the adjusting hole and through which a fastening bolt and a controlling bolt are releasably screwed, wherein one end of the guide member is also formed with a first fixing piece and a second fixing piece which are respectively fixedly inserted into the first and second supporting hole formed at the side portion of the main body, and the second fixing piece forms a path, through which the under thread is passed, together with the supporting piece and wherein the discharging hole is formed with a first discharging opening and a second discharging opening through which the under thread pulled out of the bobbin is selectively passed according to a position of the under thread.