A winding apparatus, in which paper fed along a paper feed path is guided by a free roll provided for a swingable arm so as to be passed onto a winding core, the winding core being rotated to wind up the paper into a paper roll thereon, the apparatus comprises: a swing support member on which said arm is swingably supported at its base end portion so that its free end portion may move towards and away from said winding core, the swing support member being positioned at one of sides of the winding core which is closer to the paper feed path and so that it may not interfere with the paper roll maximized in diameter; a free roll rotatably mounted on said arm and mid between said base and free end portions so as not to contact with the paper roll maximized in diameter; a body of rotation mounted at said free end portion of the arm for contacting with said paper roll; and a turning force imparting means for imparting a turning force to said arm to swing it so as to press said body of rotation against said paper roll, characterized in that: on said arm and mid between said base and free end portions there are mounted a first free roll closer to said base end portion and a second free roll closer to said free end portion to provide; a first paper winding path along which the paper guided by the first free roll is passed onto the winding core so that its reverse side may be in contact with said winding core; and a second paper winding path along which the paper guided by the first and second free rolls (16 and 17) is passed onto the winding core so that its obverse side may be in contact with said winding core, said first and second paper winding paths being switchable into one from other; and said winding core is adapted to rotate forwards and backwards. a swing support member on which said arm is swingably supported at its base end portion so that its free end portion may move towards and away from said winding core, the swing support member being positioned at one of sides of the winding core which is closer to the paper feed path and so that it may not interfere with the paper roll maximized in diameter; a free roll rotatably mounted on said arm and mid between said base and free end portions so as not to contact with the paper roll maximized in diameter; a body of rotation mounted at said free end portion of the arm for contacting with said paper roll; and a turning force imparting means for imparting a turning force to said arm to swing it so as to press said body of rotation against said paper roll, characterized in that: on said arm and mid between said base and free end portions there are mounted a first free roll closer to said base end portion and a second free roll closer to said free end portion to provide; a first paper winding path along which the paper guided by the first free roll is passed onto the winding core so that its reverse side may be in contact with said winding core; and a second paper winding path along which the paper guided by the first and second free rolls (16 and 17) is passed onto the winding core so that its obverse side may be in contact with said winding core, said first and second paper winding paths being switchable into one from other; and said winding core is adapted to rotate forwards and backwards. on said arm and mid between said base and free end portions there are mounted a first free roll closer to said base end portion and a second free roll closer to said free end portion to provide; a first paper winding path along which the paper guided by the first free roll is passed onto the winding core so that its reverse side may be in contact with said winding core; and a second paper winding path along which the paper guided by the first and second free rolls (16 and 17) is passed onto the winding core so that its obverse side may be in contact with said winding core, said first and second paper winding paths being switchable into one from other; and said winding core is adapted to rotate forwards and backwards.