| 摘要 |
PURPOSE: To achieve a steady state within a short time by continuously increasing the line speed of a film and calculating the change with the elapse of time of the width of the film from the measured value of the width change of the film from a roll longitudinal stretching machine and the line speed and automatically controlling the width of a stenter rail on the basis of the signal of the change with the elapse of time. CONSTITUTION: A light detector 4 and a floodlight projector 5 are arranged at the proper position of the roll groups 1, 1... constituting a roll longitudinal streching machine to measure the continuously changing width of a film and the measuring signal f1 is inputted to a film width measuring device 6. The output signal f2 of the measuring device 6 is inputted to an operational controller 7 and a line speed signal f3 from the motor of the proper drive roll among the roll groups 1, 1... is inputted to the operational controller 7. A stenter rail width altering motor 8 is automatically controlled by the signal f4 of the change with the elapse of time of the film width outputted from the operational controller 7 to alter the width of a stenter rail 3 corresponding to the film width. By this constitution, the line speed of the film is continuously increased and a steady state can be achieved within a short time. |
