Transportation device

Abstract

A transportation device includes a pick-up unit having a first arm, a second arm that is rotatable about a second rotation section with respect to the first arm and is provided with a feeding roller fixed thereon, and a torsion coil spring that acts on the second rotation section so as to bias the feeding roller toward the paper sheets. The first arm has a first fixation section that fixes in place one end of the torsion coil spring, while the second arm has a second fixation section that fixes in place the other end of the torsion coil spring. A plurality of spring latches is disposed on at least one of the first fixation section and second fixation section so as to adjust a spring force of the torsion coil spring.

1 . A transportation device comprising:
 a transportation device body in which a transported medium is transported by a feeding roller;   a first arm that is mounted on the transportation device body so as to be rotatable about a first rotation section with respect to the transportation device body;   a second arm that is mounted on the first arm so as to be rotatable about a second rotation section with respect to the first arm and is provided with the feeding roller fixed on the side opposite the first rotation section with respect to the second rotation section;   a torsion coil spring that acts on the second rotation section so as to bias the feeding roller toward the transported medium;   a first fixation section that is provided with the first arm and fixes in place one end of the torsion coil spring;   a second fixation section that is provided with the second arm and fixes in place one end of the torsion coil spring; and   a plurality of spring latches that is disposed on at least one of the first fixation section and the second fixation section so as to adjust a spring force of the torsion coil spring.   
     
     
         2 . The transportation device according to  claim 1 , wherein the torsion coil spring biases the feeding roller toward the transported medium by means of resilient deformation of the torsion coil spring during the rotation of the second arm with respect to the first arm. 
     
     
         3 . The transportation device according to  claim 1 , further comprising:
 a loading surface arranged at a position opposite the feeding roller and on which the transported medium is loaded; and   a cover arranged at a position above the first rotation section opposite the transported medium so as to cover the first rotation section from the outside of rotation radius of the first rotation section, wherein a gap between the loading surface and the cover regulates the number of transported media to be loaded.   
     
     
         4 . The transportation device according to  claim 3 , wherein the cover is disposed to cover the range over which the first arm rotates when the feeding roller transports the transported medium. 
     
     
         5 . The transportation device according to  claim 1 , further comprising a straight arm provided at at least one of the start and end of winding of the torsion coil spring, wherein the plurality of spring latches is formed of a plurality of ribs and the arm is engaged with a rib such that a spring force of the torsion coil spring is adjusted by changing the rib with which the arm is engaged.