taker raceway 16 and by preventing the base 12 from rotating with the rotary loop taker 18 so that the gaps 28 and 30 may periodically overlap it will be appreciated that the needle thread loop can enter between the base 12 and the rotary loop taker 18 when the gaps 28 and 30 overlap and after being drawn completely about the bobbin the needle thread loop may be withdrawn from between the base 12 and the rotary loop taker 18 when the gaps 28 and 30 again overlap the bobbin case 10 is also provided with a bobbin case cover 32 which can serve many purposes such as that of latching the bobbin in place on the base 12 that of providing a smooth snag free outer shell over which the needle thread loop can pass and that of supporting a bobbin thread tensioning means the cover 32 and the base 12 together thus provide a bobbin case 10 which is required to be restrained against rotation with the rotating loop taker to provide for such rotation restraint as best illustrated in fig1 the bobbin case 10 is formed with a pair of spaced abutments 34 and 36 each disposed substantially radially of the path of motion of the rotary loop taker and arranged.