Sheet-conveying apparatus and image-reading apparatus

Abstract

Provided is a sheet-conveying apparatus including: a skew-feeding correction member having an abutting portion which is brought into contact with a conveyed sheet; and a positioning portion positioning the skew-feeding correction member and having a biasing member for biasing the skew-feeding correction member to a direction opposite to a direction to which the skew-feeding correction member rotates by the sheet. The sheet-conveying apparatus is set so that a formula M+M<M A is established when the sheet is pulled out, wherein a moment generated in the skew-feeding correction member due to a resultant force of tensions to upstream and downstream sides is assumed to be M A , a moment generated in the skew-feeding correction member due to a frictional force between the skew-feeding correction member and the sheet is assumed to be M, and a moment generated in the skew-feeding correction member due to the biasing member is assumed to be M S .

1 - 8 . (canceled) 
     
     
         9 . An image-reading apparatus, comprising:
 a sheet feeding portion that feeds a sheet stacked thereon;   an image-reading portion that reads an image of the sheet;   a curved sheet conveying path through which the sheet, which is fed by the sheet feeding portion and is conveyed to the image-reading portion, passes;   a pair of rotary members that is provided on the curved sheet conveying path and conveys a sheet;   a skew-feeding correction member that is provided to be rotatable coaxially with one rotary member of the pair of rotary members, the one rotary member provided on an interior side of the curved sheet conveying path, wherein the skew-feeding correction member has an abutting portion with which a leading edge of the sheet conveyed toward the pair of rotary members is brought into contact for skew-feeding correction and is rotated by the conveyed sheet; and   a positioning portion that has a biasing member for biasing the skew-feeding correction member to a direction opposite to a direction to which the skew-feeding correction member is pressed by the sheet to rotate, and that positions the skew-feeding correction member at a stand-by position at which the abutting portion abuts against the sheet upstream in a sheet-conveying direction with respect to a nip portion of the pair of rotary members.   
     
     
         10 . An image-reading apparatus according to  claim 10 , wherein the image-reading apparatus is configured so that, in order to pull out the sheet while preventing the skew-feeding correction member from rotating to a direction together with the sheet to be pulled out when the stopped sheet is pulled out to the direction opposite to the sheet-conveying direction under a state in which the skew-feeding correction member contacts with the stopped sheet.