Bottom knob is feeddog drop- (darn) up (norm)
White button in senter of longer fingered control in the center is the needle position Left, Middle, Right
The long fingered silder knob is the stitch width
The top knob is the stich length
On many of these machines you have to reset the stitch width to 0 before making any other stich adjustments or it will not more or damage the intererior levers.
Go to Yahoo group japanese sewing machine collectors- someone may have a manual