Lewis 150-2 - Page 10

9
Adjust tension spring No. 21-377 with nut No. 20-120.
Normal setting is when the end of screw for adjusting
tensions No. 18-909 is about 3/32 inch from the end of nut
No. 20-120.
Before making any adjustment of the ridge forming disc~
turn the machine over by hand several times and observe
closely the action of the disc. It is to be noted that the disc
oscillates back and forth but that it does not always come
forward to the same place. When the disc is in its extreme
forward position~ a penetrating stitch is made. On the
following stitch~ the disc does not come as far forward~ and
a skip stitch is made (see Figs. 8~ 9~ Plate 1). Please note
that the machine should be in the skip stitch position before
making the adjustments on the ridge forming disc. After the
adjustments have been completed and after tightening all
screws~ again turn the machine over by hand and check to
see that the disc lines up with the needle on all strokes.
To adjust the disc to the slot in the presser foot~ loosen
set screw No. 1022 L in collar No. 39-118 and clamp screw
No. 1158 Lin crank Nb. 448-131 and set disc to center of
opening in presser foot; at the same time set the disc so that
when the p<;>int of the needlP. is at the center of the slot in
presser foot and at center of the disc~ the point of the needle
will pass over the lower step of the disc. This setting is
made when the disc is on the skip stitch stroke. Tighten
clamp screw No. 1158 L in crank No. 448-131 and set screw
No. 1022 Lin collar No. 39-118 and set the collar to take up
all end play in the ridge forming disc shaft. When using disc
No. 44-304~ the needle position should be equalized between
the front and back steps on the disc.
To remove the ridge forming disc~ depress the left hand
feed plate holder~ remove the nut No. 20-80 on end of disc
shaft and remove the washer No. 40-144 and disc. When re-
assembling the disc~ care must be taken that the key in
flange No. 107-44 engages the slot in the disc. Assemble the
washer No. 40-144 and nut No. 20-80 and tighten firmly.
RIDGE FORMING DISC REGULATOR (Refer to Plate 1A)
The dialed regulator located on top of the Cylinder Base
raises and lowers the ridge forming disc to get the correct
needle penetration in the work being done to form a blind
stitch. The word "More" indicates more depth and "Less"
indicates less depth of needle penetration.
From the library of: Superior Sewing Machine & Supply LLC