The utility model relates to a round corner hemming device for automatic hemming. It includes a mounting frame, a push rod, a crimping rod, a lower fixed seat, an upper fixed seat and a cylinder, a crimping rod is installed on the piston rod of the cylinder, a push rod is installed between the lower fixed seat and the upper fixed seat, the push rod is L-shaped, a push rod is equipped with a pusher at the front end of the push rod, the push rod is equipped with a push hand, the outer side of the pusher and the outer arm of the pusher constitute a push surface, the push rod is equipped with an inclined sliding convex at the other end of the pusher, a fixed rod is installed on the push rod, an inclined slip hole is installed on the upper fixed seat and a fixed rod is installed on one corner. A fixed rod is mounted on the push rod, a sliding hole is obliquely provided on the upper fixed seat, and a fixed rod is mounted on one corner of the upper fixed seat, and a thrust spring is provided between the two fixed rods. The rounded corner portion of the wrapping paper is folded upward by pushing the pushing surface of the push rod through an external transmission mechanism, and the rounded corner portion of the wrapping is pressed together on the skin shell by pushing the crimping lever through the cylinder, realizing automatic rounded corner wrapping.

The automatic skin shell machine includes a frame, a conveyor belt, an automatic paper discharging device, a cardboard guiding device and an automatic paper dropping device, the automatic paper discharging device consists of a spring-loaded pressure plate, a limit stopper, a cardboard limit slot, a pair of intermittently moving paper discharging friction wheels and a continuously moving transfer friction wheel; the cardboard guiding device consists of a pair of cardboard guiding stoppers and a cardboard locating friction wheel; the automatic paper dropping device consists of a gear mechanism motor, an active bevel gear, a driven bevel gear, a driven bevel gear and a driven bevel gear. The automatic paper dropping device is composed of gear mechanism motor, active bevel gear, driven bevel gear, driven bevel gear disk, connecting rod, and movable draw plate, and the action of the gear mechanism motor is controlled by the control unit. The utility model has a simple structure, changed the traditional semi-automatic shell machine, need to manually place the cardboard mode, but through the system of sensor signal feedback system and automatic control, to achieve accurate and rapid separation and delivery of cardboard, color paper and cardboard accurate positioning and cardboard automatic drop, greatly improving the production efficiency.