is engaged as shown in fig2 the amount by which the horn 14 of the present invention protrudes from bobbin case 13 is less than that of the conventional horn 101 of fig6 also unlike the conventional horn 101 horn 14 of the present invention has no thread hole hence the bobbin thread 15 wound on the bobbin 12 is merely led out of the bobbin case 13 irrespective of the horn 14 the length of the horn 14 is determined from the position of the driver 9 fig1 that is the horn 14 of the bobbin case 13 is designed such that the upper end of the horn 14 comes below the upper surface of the driver 9 when the angle of rotation of the arm shaft 1 is in a range of 5 u00b0 to 35 u00b0 with the top dead point of the needle bar as a reference 0 u00b0 the counter balance 21 is coupled to the left end of the arm shaft 1 in front of the counter balance 21 a thread take up lever needle bar crank needle bar crank rod needle bar and needle are provided the throat plate 31 is provided above the shuttle race body 8 the thread cutting device 32 and the thread control panel or shuttle race cap 41 are provided between the throat plate 31 and the shuttle race body 8 in such a manner that the thread control panel.