Brother vx 1120 Feeddog trouble

Consult the owner's manual. There should be instructions for how to darn with your machine. It would require either the feature that lowers/raises the feed dogs or a cover plate that attaches over the feed dogs.

If your machine came with the cover plate accessory, and the feed dogs are not rising to feed the fabric, then I suspect the machine has not been cleaned & oiled in quite some time and perhaps the feed dogs have seized. When you run the machine (remove the needle and presser foot), watch if the feed dogs actually drop below the needle plate, move toward the front of the machine, then rise above the needle plate and move toward the back of the machine. This is a repetitive motion that actually pulls the fabric through the machine. If this is not happening with your machine, it needs service.
...
Singer Stylist 776 Manual Page 8

When the feed dogs have been dropped, some machine feed dogs will not become activated (rise & move backward & forward) until stitching is begun.

Be sure the stitch length is set high enough to actually cause the feed dogs to move forward & backward.

If they still do not move and your machine is mechanical (not computerized), the old oil may have solidified and is preventing them from moving. A good cleaning and oiling may be required. Other than that, it may need service.

...

Check that the stitch length is set to make ~10 stitches per inch. This stitch is long enough to actually move the fabric. If the stitch length is set too short, the fabric will stay barely move and the needle will stitch almost in place.

Check that the feed dogs have not been dropped for darning or free motion quilting. In this position, they do not rise and are, therefore, unable to contact the fabric to pull it through the machine.

With the presser foot raised and using no fabric, hand rotate the handwheel and watch if the feed dogs actually drop down below the needle plate, move toward the front of the machine, then rise above the needle plate, and move toward the back of the machine. If the feed dogs are moving in this manner, then they are functioning properly.

Is there lint or gunk stuck in the feed dogs? This will restrict the ability of the feed dogs to grip the fabric.

Are the feed dogs worn? Are the little teeth worn so there are no sharp points?

What type fabric are you using? If it is very light-weight or slick fabric, the feed dogs will have a difficult time gripping the fabric. Most machines have a presser foot pressure adjustment so that more pressure is applied between the presser foot and the feed dogs. Consult your Owner's Manual. The adjustment is usually a dial either on the left side of the machine, on the front of the machine located above the needle bar, or on vintage machines it is usually a skrew located under the top lid above the needle bar.

...

it would be a good idea to have the feed dogs checked to see why
they are not moving the fabric

This is usually caused by the feed-dog ( the metal teeth in the area below the needle) being down instead of up - run your finger under there (over the teeth) if they do not stick up above the base line of the machine, they cannot feed the fabric. If this is the case, look in your manual (or and online manual for your machine) and find out how to put the feed dog up. Other than this, some machines have a plastic plate which fits over the feed dog, so that you can do free machine embroidery, if this is the case, you should be able to remove this and the fabric will feed through

the presser foot or what ever foot your sewing with does not feed the
fabric,, the feed dogs in the needle plate are what moves the fabric
to be sewed, the feet only hold the fabric against feed dog so the
machine can use the needle to sew the fabric.
if the fabric is not moving then the feed dogs have to be checked
can you see the feed dogs in the needle plate area are the up or
down?
do you have a manual for the machine?
a manual help to know where the feed dog lever is, I'm sending
you a link for a manual for the machine, so you can look for the feed
dog lever, if the feed dogs are up then there is something wrong
with the feed dogs & they need to be checked.
but if the feed dogs are down then look in the manual & see where
the feed dog lever is & put it in the up position & see if that brings
the feed dogs up to the sewing position, if the feed dogs do not
come up then the feed dogs need to be checked.

http://www.sewingpartsonline.com/instruction-manual-necchi-6015.aspx

check the feeddog lever to see if it's in the up position, if it's not try moving it to the up position. if the lever will not move, then the machine needs to be checked at a sewing machine shop

your stitch length may be set to zero

Have you changed the stitch length selector to zero ? If there is no lint trapped under the needle plate between the feed teeth, then the length selector is likely set too small,.

h! there,
fabric moves forward when machine run due to movement of feed dogs,feed dog has a teeth, when your foot presser goes down attached to fabrics the pressure hold the fabric between pressure foot and feed dogs that why when machine run feed dogs pushed fabric when recieved stitch.try to check adjustment of feed dogs it maybe set at rest or neutral.reset it to upward towards needle.check also bobbins thread if accumulation was build up under feed dogs.regard and have a nice day.