Please help guys I need the meanings of the following parts of a sewing machine, Very very very urgent.
Please tell me what:
A take-up lever does
balance wheel
foot control
bobbin winder
needle
reverse switch
thread guide
tension
presser foot
bobbin winder
foot control
feed dogs
pattern selector
stitch lenght and width control
spool pin
needle

If you can't tell me all the meanings of all the words, please try and help me with some. Please.