Merrow Class 70 - Merrow Class 70 Y Type Feed; Class 70 Y Type Feed Application; Class 70 Y Type Feed Disassembly; Class 70 Y Type Feed Disassembly Steps

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
THE MERROW MACHINE COMPANY
"Y" TYPE FEED MECHANISM
62 . The "Y" Type Feed Mechanism is used on Merrow Styles 70-Y3B, 70-ABBY, 70-ABBY-1
and 70-ABBY-4. The following
sections dealing with this feed mechanism apply only to these
styles.
63. DISASSEMBLY
a. Remove the Work Plate Support M-29 -5 by f ir st removing Screws (2) 52 -3 /16 then
moving
the Support to the rear. The Work Plate and Fabric Guard may be lefl on the
Work Pl
ate Support. Remove Needle Plate, Lower Looper Thread Tube and Feed
Dogs.
b. Remove Nut 2-3 / 16 from end of Lower Shaft and Feed Eccentric 6-82-(4-5 -6- 7-etc.).
c. Remove Ma ch in e Base A-19-Assy-2 by removing Screws 83-3 / 16 (2) and one Screw
103-3/16. Feed Adjusting Lever M-357-1 must be fully depressed to expose Screw
11103-3/ 16 and allow its removal.
d. Working from the bottom of the machine unscrew Screws (2) 71-3 / 16 which hold Feed
Link Pivot Support M-358-1 to the Machine Frame. Now the whole feed assembly may
be removed from the machine by sliding it to the l eft.
e. The Feed Carrier may be separated by taking off Nut 2-3 / 16, F.C. Bolt 6-77-E and
Bushing 6-79-D which connect it to the F .C. Link (rear) M-76-4 .
f. The F. C. Links, front M-76-3 and rear M-76-4 are removed by rotating Feed Link
Pivot M-351-1 to a position where it is totally below the mounting surface of F. L. P.
Support M -358-1 and sliding out F . L. Pivot Pin M-352-1.
g. The F. L. Pivot is removed by taking off Nut 4-3 / 16 and F. L. P.A. Spacer Bolt
M-355-1, then F . L. P. A. Spacer can be slipped out of the Feed Link Pivot.
h. Feed Link Pivot Arm (inner) M-353-1 will now slide out of F. L. P. Support M-358- 1
and
F. L. P. Arm (outer) M-353-2 will slide out when Set Screw 77-3 / 16 is removed
from F. L. Pivot Arm Actuator M-356-1.
64. ADJUSTMENT
16
a. The Feed Stroke of the "Y" Mechanism is adjustab le to produce stitch length varia-
tions in ratios up to 4 or 5 to 1. The normal stitch spacing is set by the Feed Ec-
centric (6-82-4, 5, 6, 7, 8, etc.) . The multiple stitch is achieved by a stroke change
actuated by depressing the Feed Adjusting Lever, M-357-1.
b. The maximum and minimum positions of the Feed Adjusting Lever are cont r oll:--d for
Stop Screws 1110 5-3 / 16 and 106-3/16, Stop Screw 11 105-3 /16 protrudes from the front
of the F . L. Pivot Support M-358-1 is used to set the F. A. Lever for the maximum
number of stitches desired at the se l vages . Set Screw 11106- 3 /16 which protrudes
from the rear of F . L. Pivot Support M->j58-l sets the number of stitches desired in
the body of the seam. It is possible to make fewer stitches than the rating of the Feed
Eccentric.
c. Tension Spring Adjustment Screw 116-3/8 IS used to adjust the spring which returns
the feed adjusting lever to its norma l position.