SINGER 331K4 - Manual (Page 15)

15
TO TIME THE FEED
CHECK:
Test feed assembly linkage for freedom of move­
ment. Action of feed dog must be regular and smooth
for maximum efficiency
When the feeding movement is correctly timed----------
• The feed dog stops moving toward the rear
just as the take-up lever reaches the top of its stroke.
• The feed dog drops below surface of throat
plate just as needle is about to enter material.
TIMING:
• Set the machine for longest stitch as instructed on
page 10.
• Turn up the cover plate at the rear of the machine
arm.
• Loosen set screw N in feed eccentric P, Fig. 34.
• Rotate feed eccentric P as required to obtain
desired timing.
• Securely tighten set screw N.
• Close cover plate at rear of arm.
TO SET THE FEED DOG AT THE
CORRECT HEIGHT
Before checking height of feed dog, set the machine
for longest stitch, as instructed on page 10.
When the feed dog is at its highest position, ap­
proximately the full depth of the rear teeth of the
feed dog should project above the top surface of
throat plate, as shown in Fig. 35.
Variations of feed dog height may be necessary to
balance the height with the presser foot pressure.
To adjust the height of the feed dog, loosen screw
O, Fig. 35 and raise or lower the feed bar R, Fig. 35,
as required.
When the feed dog is set to the desired height,
securely tighten screw O.
Fig. 34. Timing the Feed
FULL DEPTH
OF REAR TEETH
/
Fig. 35. Adjusting Height of Feed Dog