The band supply device of a packing machine

This invention aims to provide band supply device of a packing machine, which can select the band and draw back the band tied around the article. It is a simple setup that tautly pulls the band without adding stress to the band. The band is clasped in between a driving and an opposite drum. The two drums are rotated clockwise to place the band on the packing position. By counterclockwise rotating the two drums to the setup, packing band is drawn back. The driving drum remains on the swing arm. When the band is sent forward, the swing arm subjects a forward swinging force by compressing the opposite drum with the driving drum. The rotation center circumference of the driving drum is located at a farther back position and connects swing arm's center and opposite drum's center.