Janome MyLock 434D Serger is not working properly because the feed dogs are pushing the fabric away - toward the operator. They should be pulling it the other way. The lever on the left side of the machine seems to correct the direction but doesn't stay in position by itself.
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HOWEVER, when a machine's feed dogs do not drop, there is usually an accessory included with the machine that is a plate that covers the feed dogs so you can sew without the feed dogs moving your fabric.
Your owner's manual is probably the best source for this information.
Remove the needle plate and clean the feed dogs with a brush...remove any lint and bits of thread.
A couple of drops of sewing machine oil might help to loosen the feed dogs up. (maybe let the oil seep in and then turn the handwheel towards yourself to help things along.
One other thought:
If your machine has feed dog lowering capability you might want to move that lever/switch back and forth a couple of times.
The feed dogs might not appear to raise or lower, but some machines will only re-engage raised feed dogs when the machine starts to stitch.
Also...verify that the presser foot tension isn't too strong/heavy...and temporarily try using a longer stitch length setting.
If the fabric is not feeding, the feed dogs are probably not operating properly. Check that they have not been dropped below the needle plate (which is done when darning or free motion quilting). In this setting, the feed dogs never rise above the needle plate to grab and pull the fabric.
The other issue could be that the feed dogs are defective or perhaps seized.
Since you did not provide a model, I can provide only this assistance. It would be helpful to locate (search for make model manual) for your machine.
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.
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.
hi! there if your feed dog does not move the fabric forward or backward,if this is so try to run machine w/o the fabric check if feed dog move on cycle,the teeth should be moving upward and downward rotation pushing action on your fabric,the teeth should come out to the plate slot of feed dog.if not adjust upward, and adjust also the presser foot of needle.if your feed dog is not moving when machine running,thre is a mechanical disengage or loosen in shuttle assymble and feeder dog mechanism they link together ubder the machine,as the shuttle move on one stroke the feeder also move also with the needle.Chesk the adjustment and link mechanism.in addition to this try to clean feed dogs by brush chips thread and fabrics sometimes stored on mechanism of feed dogs and shuttle.