Adjustable and variable transmission device suitable for invoice box delivery

The utility model discloses an adjustable variable transmission device suitable for invoice box delivery. The method is characterized in that the method is characterized by comprising the following steps; the conveying device is composed of a plurality of conveying units. The transmission unit comprises a pair of supporting main cross beams; the main supporting cross beam is composed of a plurality of branch supporting cross beams. The adjacent supporting branch cross beams are hinged with each other; inserting holes are formed in the end parts of the supporting branch cross beams at one end of the supporting main cross beam; a bulge matched with the insertion hole is arranged at the end part of the supporting sub-cross beam at the other end; a plurality of rotating shafts are jointly androtationally supported between the two supporting main cross beams, the rotating shafts are evenly distributed in the length direction of the supporting main cross beams in a straight state, a drivingmotor is arranged on one