There can be various reasons for this. The needle may not be the correct one for the selected fabric, the needle may have been set too low, the fabric may not be properly guided or the bobbin case may be placed incorrectly. This is a standard fitting finger guard, this screws onto your foot shank with the foot shank screw, see other photo

Brother Sewing machines | Argos Brother Sewing machines | Argos

Compatible with all brother machines with the clip on feet, hold the button in place while sewing onto your item BROTHER Machine Embroidery Q Foot - 97E 950 NV955 NV700 1250 F440E F480 F540E M230E M240ED M280D XD0474151 If the upper thread of the machine keeps breaking where the needle enters the fabric, it could be that the needleplate or bobbin case have minor damages in the form of scratches and/or sharp edges. These minor damages can cause the thread to break after a few stitches. This presser foot shank is a HIGH shank snap-on, which screws onto your machine then allows clip on feet to be used.You can change the needle after turning off the product with the on/off switch. When cleaning the product you should disconnect it from the power supply.

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This varies between manufacturers, but in general a needle will last about 8 hours. It might take longer for the needle to break, but before that it will have become blunt and might damage the fabric. Home > Hobby & Leisure > Sewing Machines > Brother Sewing Machines > Brother LS14 Sewing Machine Manual Brother LS14 Sewing Machine