Show the cutting knives on Elna Serger - Brother 929D Mechanical Sewing Machine

Instruction Manual Elna 704DEX

https://docs.google.com/document/d/1TPuvb3cyHyctWIdeA6mUsij8kePwOUt60VowTFEvdos/edit

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Elna Serger 704 DEX Instructional Video ELV 704DEX VHS 53M

Elna Pro 704 Dex Sewing Machine Instruction Manual

Threading Elna 704DEX Serger

it's possible that there need to be a adjustment to the serger or there could be a damaged or broken part in it, having it checked would be a good idea

to change how much fabric is cut you need to move the cutting blade either left or right, this overlocker is one of the first so I think this process was pretty manual, ie using a screw driver to release and reposition the right hand blade.

it may be worthwhile buying a manual for this while you still can get them, this model was released back in 1987 in UK. Instruction Manual Elna L1 Serger

Perhaps the knives have been put in wrongly, check your manual.

you might want to replace the knives
you might have the serger checked for a timing problem
Serger thread breaks


1. Is the serger threaded correctly?


2. Is the needles inserted correctly?


3. Is one of the needles bent or damaged?


4. Is the tension adjusted too tightly?


5. Is the tension adjusted to accommodate thickness of thread being used?


6. Are you using inferior quality thread?


7. Is the thread feeding of the cone/spool freely?


8. Is the needle size correct for the type of fabric being used?


9. Are the needles being used the correct one for the serger?


10. If all of the above suggestions don't help then the serger needs to be checked for a timing problem at a sewing machine repair shop.

knives may need to be replaced and the serger needs to be checked for a timing problem

the knives probably need to be replaced

Right from Brother at 1-800-276-8437 you can order it. Also, www.sewingpartsonline.com for around $7. I think that your Serger is a 1034D, are you sure that Brother didn't give you one in your accessory bag?

For now, it works only satisfactorily:
I applied alcohol to further clean both blades,
dried and then oiled them. There seemed to be a slight gap between blades;
the fabric was dragged into the gap instead of being cut.

A new set of knives may be the fix you need. Sharp knives on a serger make a world of difference. I bought a new one for ours but I think a person could put a keen edge on the old one if they so desired.