Medium conveying device and image forming apparatus

Abstract

The medium conveying device, comprises (1) a feeder configured to feed a print medium in a conveyance direction; (2) a stacker configured to stack the print medium fed by the feeder; (3) a first guide arranged in downstream side of the print medium in the conveyance direction, the first guide including a first guide surface configured to guide a downstream edge of the print medium stacked on the stacker; and (4) a second guide arranged to be movable with respect to the first guide, the second guide including a second guide surface configured to guide the downstream edge of the print medium stacked on the stacker, wherein the second guide configured to move with respect to the first guide such that the second guide surface protrudes with respect to the first guide surface in an upstream direction as the stacked amount of the print medium stacked on the stacker decreases.

1 . A medium conveying device comprising:
 a feeder configured to feed a print medium in a conveyance direction;   a stacker configured to stack the print medium fed by the feeder;   a first guide arranged in downstream side of the print medium in the conveyance direction, the first guide including a first guide surface configured to guide a downstream edge of the print medium stacked on the stacker; and   a second guide arranged to be movable with respect to the first guide, the second guide including a second guide surface configured to guide the downstream edge of the print medium stacked on the stacker,   wherein the second guide configured to move with respect to the first guide such that the second guide surface protrudes with respect to the first guide surface in an upstream direction as the stacked amount of the print medium stacked on the stacker decreases.   
     
     
         2 . The medium conveying device according to  claim 1 , wherein
 the first guide surface is arranged to incline with respect to the conveyance direction,   the second guide moves with respect to the first guide such that the second guide surface inclines with respect to the first guide surface in the upstream direction as the stacked amount of the print medium stacked on the stacker decreases.   
     
     
         3 . The medium conveying device according to  claim 1 , further comprising
 an urging member that urges the second guide toward the direction projecting from the first guide surface.   
     
     
         4 . The medium conveying device according to  claim 3 , wherein the second guide further comprising:
 an arm part that extends toward downstream side of the conveyance direction from the second guide surface, and   an arm fulcrum that is provided in the arm part,   wherein when the stacked amount of the print medium stacked on the stacker becomes smaller than a predetermined amount, the second guide surface rotates toward the direction projecting from the first guide surface.   
     
     
         5 . The medium conveying device according to  claim 1 , further comprising
 a swinging member configured to swing the second guide with respect to the first guide,   wherein the swinging member is driven to swing the second guide at least one or more times while the print medium is conveyed.   
     
     
         6 . The medium conveying device according to  claim 1 , wherein the feeder further comprising:
 a first roller that stretches a feeding belt and drives the feeding belt, and   a second roller that stretches the feeding belt,   wherein the feeder is arranged in vertically downward side of the stacker,   wherein the feeding belt contacts a bottommost print medium among a plurality of print medium stacked on the stacker.   
     
     
         7 . The medium conveying device according to  claim 6 , wherein
 the second guide moves such that the second guide surface is closer to the feeding belt than the first guide surface.   
     
     
         8 . The medium conveying device according to  claim 6 , further comprising
 a swinging member configured to separate or contact the second guide with respect to the feeding belt,   wherein the second guide is arranged so as to be contacted and separated with respect to the feeding belt.   
     
     
         9 . The medium conveying device according to  claim 8 , wherein
 the urging member is a cam,   the second guide is separated from the feeding belt at a predetermined cycle.   
     
     
         10 . An image forming apparatus provided with the medium conveying device of  claim 1 ,
 wherein the image forming apparatus performs a desired printing on the print medium conveyed from the medium conveying device.