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5
4
3
Fig.19
18 .. TIMING OF TH·E VIBRATING PRESSER FOOT (Fig.19)
This is the normal timing when
turn
the pulley toward you, after lowing the presser bar lifter, the vibrating
presser foot should reach the feed dog earlier than the needle eye comes to, and when the needle raises, the
vibrating presser foot should leave the feed dog after the needle eye has left the feed dog. This is due the reason
that the vibrating presser foot must tightly hold the goods while the needle is passing the goods for avoiding
irregular stitches. To adjust this, set the lift of the alternating presser feet to equal, loosen the two screws ( 4) and
adjust the rotating position of the cam faster or slower as may be desired, and tighten the screws.
19 .. ADJUSTING THE THREAD TAKE-UP SPRING (Fig.20)
Normally, the thread take-up spring
(I )
should hold slack of the upper thread until the needle reaches to the
goods, and it should pause while raising of the needle and passing the upper thread through the bobbin case.
1) For more control action -on the thread
Loosen the stop screw (2), move
the. stop (3) to the right (for less action,
move to left). Tighten the screw.
2) To adjust the tension spring
Loosen the nut (4) and screw (5),
turn
the tension stud ( 6) slightly to the
left to strengthen the tension (to lighten
the tension, turn to the right) with a
screw driver. Tighten the screw and nut
upon completion of adjustment.
- 9 -
Fig.20
3
2
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