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1-5) Feeding is inappropriate. 5-A) Too high feed dog causes Lower the height of the feed dog (0.8 mm for standard size,
jumping at high speeds. 1.2 mm for B-SH) or increase the pressure to prevent the
material from jumping.
5-B) The tip of the feed dog is worn. Sharpen the tip of the feed dog with a diamond file or the
like, or replace the current feed dog with new one.
5-C) The pitch of the feed dog is too Replace the current feed dog with a new one having a
large. smaller pitch.
5-D) The inclination of the feed dog Change the positions of the top and bottom feeder bar pins
is inappropriate. nd make the tip side of the feed dog higher to perform
the material pulling function effectively.
5-E) The parallel level of the feed dog Replace the current feed tooth with new one.
is inappropriate.
5-F) The feeding speed is too high. Reduce the feeding speed.
5-G) Others Use a small gauge for a gap between the throat plate groove
and feed dog in the moving direction without interference
with the movement of the feed dog when a feeding pitch
is small.
2. Uneven material feed 2-1) Feeding is inappropriate. 1-A) The height of the feed dog is Lower the height of the feed dog (0.8 mm for standard size,
too high. 1.2 mm for B-SH) or increase the pressure to prevent the
material from jumping.
1-B) The feed trace is inappropriate. Adjust the timing of the vertical feed cam with reference to
3.-4) Feed trace and phase.
1-C) The tip of the feed dog is worn. Sharpen the tip of the feed dog.
1-D) The pitch of the feed dog is too Use a feed dog with a smaller pitch.
large.
1-E) The inclination of the feed dog Make the tip of the feed dog lower.
is inappropriate.
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