Feeding and unwinding device of multicolor printing machine

The feeding and unwinding device of the multicolor printing machine comprises a base, a first electric push rod is fixedly installed at the top of the base, a transverse plate is fixedly installed at the output end of the first electric push rod, placing frames are fixedly installed on the left side and the right side of the transverse plate, a motor box is fixedly installed on the right side of the base, and the motor box is fixedly installed on the right side of the base. A stepping motor is fixedly installed in an inner cavity of the motor box, a screw rod is fixedly installed on an output shaft of the stepping motor, screw blocks are in threaded connection with the left side and the right side of the surface of the screw rod, and a right-hand thread and a left-hand thread are formed in the left side and the right side of the surface of the screw rod correspondingly. According to the multi-color printing machine, the base, the placing frame, the first electric push rod, the transverse plate, the connecting