Unwinding device based on auto perching machine

The utility model provides an unwinding device based on auto perching machine, including a pair of yardage roll support and one set of permanent tension adjusting device, the parallel is arranged about the yardage roll support for support the cloth roller, make the yardage roll can be on the yardage roll support horizontal migration, the cloth roller both ends of cloth roller are provided with the draw -in groove for connect the axle among the permanent tension adjusting device, permanent tension adjusting device passes through elbow type fixing base and installs in the bottom of yardage roll support one side for it provides brake force to the yardage roll to unreel the in -process. This unwinding device can carry out permanent tension to the yardage roll at automatic perching in -process and unreel, plays the effect of buffer memory yardage roll simultaneously. The utility model has the advantages of unreel the tension invariant, the yardage roll is changed convenient fast, and simple structure presses close