| 摘要 |
<p>PURPOSE:To prevent concentration unevenness in a subscanning direction from being generated in a picture, formed in a recording medium, by connecting a feed speed fixing device, which generates load stress possible to fluctuate, to a drive roller. CONSTITUTION:In a feed speed fixing device 45, a pulse speed, output by a pulse generator 44, is controlled to variably set rotational torque generated in the reverse direction to the direction of rotation of a main drive roller 27 by a stepping motor 42. An encoder 50, connected with a rotational speed unevenness measuring system 49, is connected to the stepping motor 42, and a frequency component of rotational speed unevenness, acting on the main drive roller 27, is previously analyzed in FFT by the rotational torque of this stepping motor 42, so that a film 7 can be high accurately subscan-moved by freely setting a peak frequency of this rotational speed unevenness.</p> |
