■ Preparation for operation: 1. Safety prec�utions: 1 ) When turning the power on, keep y our hands and fingers away from the area around/under the needle and the area around the pulley. Power must be turned off when the machine is not in use, or when the operator leaves the seat. 3) Power must be turned off when tilting the machine head, installing or removing the "V"...
■ Cautions on use 1. Oiling (1) (Fig.l) Filling the oil reservoir with oil up to "H" mark. Oil level should be periodically checked. If oil; level is found below "L"; level replenish oil to "H" level. Use white spindle oil. 2.
2. Winding of bobbin thread (Fig.5) Note: When bobbin thread is wound, keep the presser foot lifted. Adjustment: Tension of wound thread: Slack winding is recommended for polyester thread and nylon thread. Conically wound thread Move the thread guide toward smaller diameter of wound thread layer. Length of wound thread Loosen the thread length adjusting screw to increase length of thread and tighten the screw to decrease length of thread.
Needle thread tension should be adjusted in reference to bobbin thread tension. 7. Needle thread tension (Fig.11) To adju�t needle thread tension, turn each tension adjusting nut. Needle thread tension can be also adjusted for special fabric and thread by changing intensity and movable range of slack thread adjusting spring.
1 ) Lean the machine head backward. 2) Turn the hand wheel by hand and stop when the feed dog rises to the maxinrum height. Loosen the feed setscrew. Vertically move the feed bar (in the direction indicated by arrow in the figure) to adjust it to - a dequate height.
13. Safety clutch device (Fig.20.21) Safety clutch device is installed to prevent the hook and cog belt from damage in case the thread is caught into the hook when the machine is loaded abnormally during operation. 1) Function of safety clutch A.
1 ) Loosen the special bolt. 2) The vertical strokes of the presser feet become maximum when the crank rod is moved upward and set. The vertical strokes become minimum when the nut is moved downward and set. After the adjustment, fully tighten the special bolt. The vertical strokes of the presser feet can be adjusted within·...