Rewinding device of printing ink spot color sample coating machine for cigarette aluminum-foil paper

The utility model discloses a back-rolling device of a printing ink spot color sample coating machine for cigarette aluminum-foil paper, relates to the field of printing, and solves the technical problem that a sample taking mode of an existing printing ink spot color sample coating machine for cigarette aluminum-foil paper is easy to damage appliances and stain samples. The device comprises a machine body, an air expansion shaft, a material collecting roller and a coloring plate roller, a supporting seat is fixedly installed at the top end of the machine body, a containing groove is formed in the middle of the machine body, the air expansion shaft is arranged at one end of the containing groove, the material collecting roller and the coloring plate roller are rotatably installed in the containing groove, and positioning structures used for positioning the material collecting roller are arranged on the two sides of the material collecting roller. A pneumatic brake used for braking the material collecting roll