Medium conveying apparatus

Abstract

A medium conveying apparatus includes a motor, a first shaft, a conveyance roller, a second shaft, a driven roller, and a presser. The motor generates a driving force. The first shaft is rotated by the driving force. The first shaft extends linearly in a direction perpendicular to a medium conveyance direction. The conveyance roller is fixed to the first shaft to convey a medium. The driven roller is mounted on the second shaft to rotate following the conveyance roller. The presser presses a center portion of the second shaft in a direction perpendicular to the medium conveyance direction to a downstream side in the medium conveyance direction.

1 . A medium conveying apparatus, comprising:
 a motor to generate a driving force;   a first shaft extending linearly in a direction perpendicular to a medium conveyance direction to be rotated by the driving force;   a conveyance roller fixed to the first shaft to convey a medium;   a second shaft;   a driven roller mounted on the second shaft to rotate following the conveyance roller; and   a presser to press a center portion of the second shaft in a direction perpendicular to the medium conveyance direction to a downstream side in the medium conveyance direction.   
     
     
         2 . The medium conveying apparatus according to  claim 1 ,
 wherein the second shaft is non-rotatable, and the driven roller is mounted to be rotatable with respect to the second shaft.   
     
     
         3 . The medium conveying apparatus according to  claim 1 ,
 wherein the second shaft is rotatable, and the driven roller is fixed to the second shaft to rotate according to a rotation of the second shaft.   
     
     
         4 . The medium conveying apparatus according to  claim 1 ,
 wherein the second shaft is disposed upstream from the first shaft in the medium conveyance direction, and   the presser presses the center portion of the second shaft in the direction perpendicular to the medium conveyance direction to the downstream side in the medium conveyance direction and toward the first shaft.   
     
     
         5 . The medium conveying apparatus according to  claim 4 , further comprising:
 a third shaft extending linearly in a direction perpendicular to the medium conveyance direction to be rotated by the driving force;   a second conveyance roller fixed to the third shaft to convey a medium;   a fourth shaft disposed downstream from the third shaft in the medium conveyance direction;   a second driven roller mounted on the fourth shaft to rotate following the second conveyance roller; and   another presser to press a center portion of the fourth shaft in a direction perpendicular to the medium conveyance direction toward the third shaft in a direction perpendicular to a medium conveyance surface.   
     
     
         6 . The medium conveying apparatus according to  claim 1 , further comprising an angle adjuster,
 wherein the presser has an inclined surface abutting against the second shaft, and the angle adjuster adjusts an inclination angle of the inclined surface.   
     
     
         7 . The medium conveying apparatus according to  claim 6 , further comprising:
 processing circuitry configured to determine a thickness of the medium conveyed,   wherein the angle adjuster adjusts the inclination angle of the inclined surface based on the thickness determined by the processing circuitry.   
     
     
         8 . The medium conveying apparatus according to  claim 1 , further comprising:
 a pressing force adjuster to adjust a pressing force with which the presser presses the driven roller toward the conveyance roller.   
     
     
         9 . The medium conveying apparatus according to  claim 8 , further comprising:
 processing circuitry to determine a thickness of the medium conveyed,   wherein the pressing force adjuster adjusts the pressing force based on the thickness determined by the processing circuitry.   
     
     
         10 . A medium conveying apparatus, comprising:
 a motor to generate a driving force;   a first shaft extending linearly in a direction perpendicular to a medium conveyance direction to be rotated by the driving force;   a conveyance roller fixed to the first shaft to convey a medium;   a second shaft inclined such that a center portion of the second shaft in a direction perpendicular to the medium conveyance direction is located downstream from end portions of the second shaft in the medium conveyance direction; and   a driven roller mounted on the second shaft to rotate following the conveyance roller.