The Singer 30-Stitch Electronic Sewing Machine 7422 is easy to use, but when it begins to drop stitches due to frequent use or fabric frequently bunches up, it is likely that the needle timing is off. For a stitch to be precise, the needle, hook and scarf need to be in sync with one another. Re-timing a sewing machine is a delicate process and requires careful attention and patience.
Slide the needle plate off of the sewing machine to the left with your hands. In the case just beneath the needle plate, remove the bobbin. With a flathead screwdriver, remove the bobbin case. Keep track of all parts. The hook is now exposed.
Set your Singer machine in the centre needle position.
Move the needle to its lowest point by rotating the hand wheel. The hook point should meet the scarf, which is the notch on the back of the machine, at .5mm on the needle. The hook should pick up your thread. If not, remove the bottom cover from your Singer by unscrewing the screws with a screwdriver.
Locate the lower driveshaft. The shaft is on the left side of the machine and is fit with gears. On the right side of the driveshaft, loosen the screws with a Phillips head screwdriver, and manually adjust the shaft by turning it, keeping the hand wheel secure with your other hand. You want the hook point to enter right behind the needle when you turn the hand wheel. Reset the screws with the screwdriver.
Reassemble your Singer sewing machine. Sew a seam to test that the stitches lock in the centre of your fabric.
Unplug your sewing machine from the electrical source before adjusting the timing.