Automatic band-retracting tightening machine has tensioning operation section and releasing retraction section for tensioning and releasing size ribbon where back axle of framework has rotational retraction brake plate

摘要

The invention relates to a tensioning device. Wherein, the framework of tensioning device has a tensioning operation section and a releasing retraction section for tensioning and releasing size ribbon; the back axle of framework has a rotational retraction brake plate and a double twisted spring of brake plate; the front part of handle has a eccentric protrude arc for pushing brake plate and small baffle plate; the main axle has a retraction disc with ratchet wheel at two ends and a retraction device to retract size ribbon via swirl spring; the big baffle plate of handle has a big baffle plate and a double twisted spring that forcing big baffle plate; the big baffle plate has press key and the compress feet for initiating the retraction brake plate. Said invention has the function of general tensioning device that bounding goods and it can automatically retraction size ribbon while it can freely adjust the retraction speed or stop retraction in the process of retracting size ribbon, to avoid metallic hook rebounding. And it has simple operation and high safety.