Patent ID: 8267345

Claim:
A paper roll mounting device comprising: a rotating shaft rotatably supported by two frames that face each other at a distance; a plurality of pairs of arms attached to the rotating shaft so as to face each other in an axis direction of the rotating shaft and configured to be individually movable in the axis direction; paper roll supporting means provided to an extremity of each of the arms so as to face each other in the axis direction; a male screw member supported parallel to the rotating shaft by the rotating shaft, and configured to penetrate both arms of one of the pairs of arms that face each other in the axis direction; a female screw member provided rotatably to each of the facing arms and coupled to the rotating shaft and configured to be thread-connected to the male screw member; and a female screw driving motor configured to individually rotary-drive the female screw member, wherein the paper roll mounting device, configured to enable a paper roll to be supported by the paper roll supporting means provided to each of the arms of one of the pairs of arms by rotary-driving the female screw member to individually move each of the arms in a direction parallel to the rotating shaft, is provided with: a female screw rotation amount signal output means provided to output a rotation amount signal corresponding to a rotation amount of the respective female screw member, individually on a female screw member basis, in response to rotation of the female screw member; and an arm stop position control unit configured to enable setting of a reference position for each of the arms, and, when changing a position of each of the arms in the axis direction of the rotating shaft, to enable input designation of a stop position of each of the arms, and to detect a current position of the arms with respect to the reference position by calculating a movement amount of the arms based on the rotation amount signal, and thereby move each of the arms to the designated stop position and cause each of the arms to stop at the designated stop position, thus making each of the arms stoppable at a desired position in the direction parallel to the rotating shaft.