The needle moves forwards and backwards with the foot. Some machines have one or the other but not both walking parts. Biggest perk is it assist with feeding top and bottom fabrics through at the same rate, especially with more thickness of material. A standard machine with no walking funtion will tend to feed the bottom material slightly faster than the top because the feed dogs are only engaging the bottom fabric. If you dont stay on top of it, you will get to the end of a long seam and your ends will not line up. This can be very exaggerated on a 10 foot seam on a tipi.
Im not familiar with many juki machines so i cant give a comparison. My juki ddl552 does not have any walking function. My consew 206rb5 has walking fooy and needle. The juki hasnt been used since i bought the consew. The 552 also does not have reverse, so that impacts my use as well.
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I found a good YouTube that cleared it up for me.
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