Media conveying apparatus, media conveying method, and non-transitory recording medium

Abstract

A media conveying apparatus includes first and second rollers, first and second sensors, and circuitry. The rollers are spaced apart in an orthogonal direction orthogonal to a medium conveyance direction, to rotate independently to convey the medium. The first and second sensors are disposed downstream from the first and second rollers, respectively, in the medium conveyance direction. The circuitry sets circumferential speeds of the first and second rollers to a first speed and a second speed higher than the first speed, respectively, to correct a skew of the medium when the first sensor detects the medium before the second sensor. The sensors are disposed in a same position when viewed in the orthogonal direction. The position of the first sensor in the orthogonal direction is the same as a rotational center position of the medium that rotates at a speed ratio of the second speed to the first speed.

1 . A media conveying apparatus comprising:
 a first roller and a second roller spaced apart in a direction orthogonal to a medium conveyance direction in which a medium is conveyed, to rotate independently to convey the medium;   a first sensor disposed downstream from the first roller in the medium conveyance direction;   a second sensor disposed downstream from the second roller in the medium conveyance direction; and   circuitry configured to set a circumferential speed of the first roller to a first speed and a circumferential speed of the second roller to a second speed higher than the first speed to correct a skew of the medium when the first sensor detects the medium before the second sensor detects the medium,   the first sensor and the second sensor being disposed in a same position when viewed in the direction orthogonal to the medium conveyance direction,   the position of the first sensor in the direction orthogonal to the medium conveyance direction being the same as a rotational center position of the medium that rotates at a speed ratio of the second speed to the first speed.   
     
     
         2 . The media conveying apparatus according to  claim 1 ,
 wherein the first sensor is disposed within a predetermined range from a position outside the first roller in the direction orthogonal to the medium conveyance direction by a distance L calculated by L=D/(α−1),   where α represents a ratio of the second speed to the first speed and D represents a distance between the first roller and the second roller.   
     
     
         3 . The media conveying apparatus according to  claim 2 ,
 wherein the first sensor is disposed downstream from the first roller in the medium conveyance direction by a distance A that satisfies A≥(L+D)·tan θb,   where θb represents a maximum angle of inclination of the medium for which the media conveying apparatus supports skew correction.   
     
     
         4 . A media conveyance method comprising:
 conveying a medium with a first roller and a second roller spaced apart in a direction orthogonal to a medium conveyance direction, in which the medium is conveyed, to rotate independently to convey the medium; and   setting a circumferential speed of the first roller to a first speed and a circumferential speed of the second roller to a second speed higher than the first speed to correct a skew of the medium when a first sensor disposed downstream from the first roller in the medium conveyance direction detects the medium before a second sensor disposed downstream from the second roller in the medium conveyance direction detects the medium,   the first sensor and the second sensor being disposed in a same position when viewed in a direction orthogonal to the medium conveyance direction, the position of the first sensor in the direction orthogonal to the medium conveyance direction being the same as a rotational center position of the medium that rotates at a speed ratio of the second speed to the first speed.   
     
     
         5 . A non-transitory recording medium storing a plurality of instructions which, when executed by one or more processors, causes the one or more processors to perform a method for controlling a media conveying apparatus, the method comprising:
 setting a circumferential speed of a first roller to a first speed and a circumferential speed of a second roller to a second speed higher than the first speed to correct a skew of a medium when a first sensor detects the medium before a second sensor detects the medium,   the first roller and the second roller being spaced apart in the media conveying apparatus in a direction orthogonal to a medium conveyance direction in which the medium is conveyed, to rotate independently to convey the medium,   the first sensor being disposed downstream from the first roller in the medium conveyance direction in the media conveying apparatus,   the second sensor disposed downstream from the second roller in the medium conveyance direction in the media conveying apparatus,   the first sensor and the second sensor being disposed in a same position when viewed in the direction orthogonal to the medium conveyance direction,   the position of the first sensor in the direction orthogonal to the medium conveyance direction being the same as a rotational center position of the medium that rotates at a speed ratio of the second speed to the first speed.