Swing controller

Abstract

A swing controller includes a swing member including a swing shaft on which the swing member swings and a contact portion, and a torsion coil spring. The torsion coil spring includes a rotation support shaft on which the torsion coil spring rotates, a fixed first arm, and a second arm on which the contact portion slides. The rotation support shaft is at a position different from a position of the swing shaft. When the swing member swings in a predetermined direction, a reaction force in a direction opposite to the predetermined direction is applied to the swing member by a friction force between the contact portion and the second arm.

1 . A swing controller comprising:
 a swing member including a swing shaft on which the swing member swings and a contact portion;   a torsion coil spring including:
 a rotation support shaft on which the torsion coil spring rotates, the rotation support shaft being disposed at a position different from a position of the swing shaft; 
 a fixed first arm; and 
 a second arm on which the contact portion slides, 
   wherein, when the swing member swings in a predetermined direction, a reaction force in a direction opposite to the predetermined direction is applied to the swing member by a friction force between the contact portion and the second arm.   
     
     
         2 . The swing controller according to  claim 1 , further comprising:
 a feed roller to feed a medium; and   a separation roller disposed oppose the feed roller,   wherein the swing member supports the separation roller to swing the separation roller away from the feed roller when the swing member swings in the predetermined direction.   
     
     
         3 . The swing controller according to  claim 1 , further comprising processing circuitry configured to determine whether a medium is present at the location of the swing member based on a position of the swing member. 
     
     
         4 . The swing controller according to  claim 2 , further comprising an elastic member disposed separate from the torsion coil spring, the elastic member applying a force to the swing member in the direction opposite to the predetermined direction. 
     
     
         5 . The swing controller according to  claim 2 , further comprising a plate configured to contact a surface of the separation roller and prevent the separation roller from rotating when the swing member swings in the predetermined direction. 
     
     
         6 . The swing controller according to  claim 2 , further comprising processing circuitry configured to:
 determine a rotation direction of the separation roller; and   stop the separation roller from rotating based on a frequency of changes in the rotation direction of the separation roller.