Differential Feed - ELNA 745 Service Manual

HORIZONTAL FEED TIMING AGAINST CHAINSTITCH NEEDLE 15b
Note: It is essential to precisely check and adjust this timing.
This adjustment avoids bending the chain needle(s) when sewing through maximum thickness
of materials.
1. Remove: Mains lead - Machine base
2. Check height of feed dog and vertical feed timing. (See page 13 and 14)
3. Set Stitch Length at "4" and differential feed dial at the neutral position "1".
4. Bring needle bar to its heighest position.
5. Place a sheet of paper underneath the presser foot. Lower presser foot. (Fig.1)
6. Turn handwheel towards you (A2 direction in Fig. 4) to bring tip of "L0" needle into the
paper (See Fig. 2- 1 ).
Turn handwheel towards you further and bring tip of "L0" needle flush to the paper (See
Fig. 2- 2 ).
Then, turn handwheel backwards (A1 direction in Fig. 4) until tip of "L0" needle comes
into the paper slightly (See Fig. 2- 3 ).
7. Check if the needle point is set in the middle or in the front edge of the open hole on the
paper. See Figure 3 for correct setting.
8. If not, loosen screw "a" and hold the feed eccentric "3" in position. Then turn the
handwheel clockwise "A1" or counterclockwise "A2" as shown in Figure 4 in order to get
the correct setting and tighten screw "a".
9. Recheck the adjustment and if necessary re-adjust the position of feed eccentric "3".