An apparatus (un-interleaver) for unwinding a roll of material interleaved with another material, and for separating the materials, includes a first platform, a second platform, a tension-sensor, an edge-sensor, and a controller. The controller monitors signals generated by the tension sensor and the edge sensor, and in response to the signals: a) causes the speed at which the second platform rotates to change to maintain a predetermined tension in the second material as the second material travels from the first platform toward the second platform, and b) causes the second platform to move relative to the first platform to align the edge of the second material traveling toward the roll of second material with the edge of the second material in the roll.

The separator production method in accordance with an embodiment of the present invention includes a coated article winding off step of winding off, from a core, a separator original sheet which has been taken up in a coated article taking up step of winding the separator original sheet on an outer peripheral surface of the core while oscillating the core in a rotation axis direction, and the core is oscillated in the rotation axis direction in the coated article winding off step.

There is provided a winding device, including: a winding part that winds a longitudinal recording medium in which an image is formed: a suppressing member that suppresses generation of a strain in the longitudinal recording medium wound by the winding part; and an operation part that operates the suppressing member in a case where the strain in the longitudinal recording medium wound by the winding part is a threshold value or more.