Abstract Winding apparatus for taking up a sheet into a roll state by the center drive has the winding tension controlled in such way that a winding radius is detected, that the detected signal is subjected to a calculation for comparison with a tension value under a tension gradient previously set, and that a signal of the calculated tension value is amplified. For the tension control, a theoretical equation is adopted in which the winding radius is a variable and in which certain conditions are taken into consideration. The winding tension control is accomplished by means of a torque actuator which is coupled with a winding shaft. In an arithmetic circuit, the detected winding radius is processed in an analog or digital system, and the comparison is made between the theoretical tension value evaluated and the appropriate tension value previously set. The tension control system is also applied to winding apparatus which jointly uses the center drive system and the surface friction drive system.
A winding tension control system comprising: a. a winding shaft for taking up a sheet into a roll state, b. detecting means for continually detecting the radius of a winding roll under a winding operation, c. an arithmetic circuit which calculates a tensile value at an arbitrary radius of said winding roll on the basis of a theoretical equation, d. a comparison control unit which multiplies a winding radiusdetecting signal obtained by said detecting means, by said tensile value calculated by said arithmetic circuit and which thus outputs a desired winding torque signal, and e. a torque actuator which controls a winding torque of said winding shaft by the output signal from said comparison control unit.
Claim 2
Dependent Claim
116 words
A winding tension control system comprising: a. a winding shaft for taking up a sheet into a roll state, b. detecting means for continually detecting the radius of a winding roll under a winding operation, c. an arithmetic circuit which calculates a tensile value at an arbitrary radius of said winding roll on the basis of a theoretical equation, d. a comparison control unit which multiplies a winding radiusdetecting signal obtained by said detecting means, by said tensile value calculated by said arithmetic circuit and which thus outputs a desired winding torque signal, and e. a torque actuator which controls a winding torque of said winding shaft by the output signal from said comparison control unit.
Claim 3
Dependent Claim
106 words
The winding tension control system as defined in claim 1, characterized in that said theoretical equation is given by: F F0 (1 - Beta (R - Rmin/Rmax - Rmin) ) for the calculation of said tensile value where R : radius of said winding roll, Rmin : radius of an initial winding, Rmax : Maximum radius of said winding roll, F0 : tension value at the initial winding, Beta : coefficient of a tapering tension as is expressed by (F0 - F1)F0 where F1 denotes a tension at the maximum winding radius, and theta : any positive rational number such as 1/2 , 1 and 2.