TAPE TENSIONING MECHANISM OF TAPE RUNNING DEVICE

摘要

PURPOSE:To keep the tension approximately constant independently of the winding diameter of a tape by providing an arm turning fulcrum position so that the directio of the force moving a tension pin is approximately orthogonal to a tension arm when the winding diameter of the tape is maximum. CONSTITUTION:A tension arm 11 to which a tension pin 13 is attached is supported on a shaft 12 freely turnably, and a brake band is stretched between the arm 11 and a reel base, and the pin 13 is moved to adjust the tension. The shaft 12 as the turning fulcrum of the tension arm 11 is set to such position that the direction of the force moving the pin 13, namely, a vector t3 is approximately orthogonal to the direction of the arm indicated by a line 36 when the winding diameter of the tape is maximum. Thus, when the winding diameter is changed from the maximum position, the force is applied in such direction that the pin 13 is difficult to turn, and the tension difference between the maximum winding diameter and the minimum diameter is reduced, and a certain tension is always kept independently of the winding diameter.