not very complex these days, they are electric . Saw a brand 'elvira' who has lots of digital version, sewing has become easier than back in the days, no more pedals:)
Present day sewing machines are complex electrical machines.
third class all the way
theory of sewing machine
sewing machine:) A sewing machine uses thread to fasten fabric together. A sowing machine plants seeds.
what is the function of the head of the sewing machine
A mechanical sewing machine.
the sewing machine brooklyn
what is the function of a pulley in a sewing machine
What does the tension disc do on the sewing machine
The Singer 2517 Sewing Machine is quiet.
If by "olden days" you're referring to prior to 1846 (when the sewing machine was invented), there was no sewing machine. All sewing was done by hand.
The difference between an electric sewing machine and a manual sewing machine is only the method of propulsion. The electric machine uses an electric motor, while the manual machine uses a hand crank or foot pump to power it. The actual sewing machine is the same.