The purpose of the check spring is to maintain tension on the thread as the thread take up arm returns to the top of the stroke pulling the thread back out of the cloth.
The take-up arm follows the needle. As the needle leaves the cloth, the friction between the thread and the cloth forms a loop that the hook inside the machine catches, pulls around the lower/bobbin thread forming the locked stitch. As the take up arm returns to the top of the stroke the thread between the tensioner and the take up arm becomes slack. The check spring pulls on this slack to keep the thread taut.
Proper stitches can not be formed if the check spring is not set with sufficient "snap-back" or tension on the spring. Setting the "snap-back" is by feel. Adjust it from loose to tighter to get good stitches. It is a three way balance between the upper thread tensioner, the check spring and the bobbin tension.
The opening in a sewing machine table is normally adjustble to accomodate different sies of machines. You should always check the dimesions before ordering when possible.
The Yamata FY812 Heavy Duty Sewing Machine will work on denum.
Janome 11558 Heavy-duty Sewing Machine by BRADY will work.
No.
the first practical sewing machine is credited to the work of Englishman Thomas Saint in 1790
Yes
Sewing machines were invented during the first Industrial Revolution to decrease the amount of manual sewing work performed in clothing companies. Since the invention of the first working sewing machine, generally considered to have been the work of Englishman Thomas Saint in 1790, the sewing machine has vastly improved the efficiency and productivity of fabric and clothing industries.-Wikipedia
A sewing machine is a textile machine used to stitch fabric, cards and other material together with thread. Sewing machines were invented during the first Industrial Revolution to decrease the amount of manual sewing work performed in clothing companies. Since the invention of the first working sewing machine, generally considered to have been the work of Englishman Thomas Saint in 1790,[1] the sewing machine has vastly improved the efficiency and productivity of fabric, clothing and needle industries.Jordan Baird copyed this from wikipediahere is proofSewing machine
The Shark 80-Stitch Sewing Machine works with quilted material.
the tension is probably wrong. try tightening/losening it.
Check and see if the bobbin thread is wound/jamming the feeder, if so carefully remove the bobbin & the thread. Clean out any loose thread bits and any thread/fabric dust. If this doesn't work try cleaning and oiling your sewing machine. Once you have done these things rethread your sewing machine, check the bobbin to make sure the thread is on correct (if it is too loose or not on smoothly you may need to reload your bobbin), replace the bobbin in the holder and test on scrap fabric that you are sewing so as to set the tenion of the thread. Always refer to your sewing machines mannal also.
It is not advised as the sewing machine is designed to work with fabric, a much softer and suppler material than cardboard. You would risk major damage to your sewing machine and possibly voiding any warranty you may still have on it.