INSIDE MOTOR 7400 SERIES

The electric motor is connected to a drive wheel by way of a drive belt. The drive wheel rotates the long upper drive shaft, which is connected to several different mechanical elements. The end of the shaft turns a crank, which pulls the needle bar up and down. The crank also moves the thread-tightening arm.. It provides consistent speed control, quiet operation, and durability, making these models reliable for both beginner and intermediate sewists.