| 摘要 |
PROBLEM TO BE SOLVED: To adapt the web roll unwinding of a central unwinding device to the high speed work of slitter of the like by removing a pulsation resulting from the fluctuation of unwinding speed caused corresponding to the eccentricity of the web roll and making central unwinding speed almost constant. SOLUTION: In unwinding a film F from web roll A eccentric to the axial center of a bobbin B, oedinary control rotation in the case of no eccentricity of the above web roll is corrected on the eccentric quantity (e) of the web roll, and a rotation angleθon the rotary center coordinate of the roll and the phase slip of an eccentric position to control the rotation of the unwinding drive motor M of an web roll A, and the number of revolutions is periodically varied to one revolution if the web roll to make the unwinding speed constant.
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