The subject innovation relates to a tension adjusting device of new structure to expand the synthetic resin sheet by applying a proper tension to a synthetic resin sheet manufactured cut out the peripheral surface of the plastic billet linearly.
Tension adjuster according to the present invention when the above synthetic resin sheet (2) between the upper peripheral face of the lower circumferential surface and the habuji Chiba 51 and 52 of the upper support bar (60) to pass through, wherein the synthetic resin sheet (2 ) it is passed through a tension control device in a zigzag shape curved in the vertical direction.
Thus, the advantages that would be the synthetic resin sheet (2) is pulled stretched linearly to an appropriate tension as bent repeatedly in the vertical direction.
In particular, according to the thickness or material of the synthetic resin sheet (2), there is be a stress is to stick together to be applied when producing the above synthetic resin sheet (2), the tension control apparatus according to the present invention is use of the hatch driving means 70 and by lifting the lifting frame 40, the synthetic resin sheet (2) by appropriate adjustment of the tension applied to the bending angle at which the plastic sheet 2, a synthetic resin sheet (2) is adjustable so as to more accurately straighten linearly there is an advantage in that.