Patent ID: RE44947

Claim:
A sheet feeding device feeding sheets stored in a sheet storage portion of a sheet cassette, wherein the sheet cassette comprises: a first cassette portion; a second cassette portion slidably connected with the first cassette portion in order to change the size of the sheet storage portion according to the size of a sheet to be stored; a rear end regulating member which is movably provided in the second cassette portion, and which regulates the rear end of a sheet stored in the sheet cassette; a first fixed portion which is able to fix the first cassette portion and the second cassette portion in a state in which the sheet cassette size of the sheet storage portion is shortened or extended by sliding of the second cassette portion; an operating portion provided on the rear end regulating member which releases the fixing by the fixed portion, wherein the fixing of the fixed portion is released by either an operation of which the operating portion is press-operated in a shortening direction where the second cassette portion is slid to shorten the sheet cassette or an operation of which the operating portion is press-operated in an extending direction where the second cassette portion is slid to extend the sheet cassette; a second fixed portion which fixes the rear end regulating member to the second cassette portion at a position corresponding to the size of a sheet to be stored; an operating portion provided on the rear end regulating member which releases the fixing of the first cassette portion and the second cassette portion by the first fixed portion and which releases the fixing of the rear end regulating member and the second cassette portion by the second fixed portion; and a third fixed portion which fixes the rear end regulating member and the second cassette portion in such a way that the second cassette portion and the rear end regulating member slide and move on the first cassette portion as one body, wherein, when the second cassette portion is slid to shorten the sheet cassette size of the sheet storage portion and is positioned at a predetermined position, the third fixing portion is released by engaging a fixing releasing member provided on the first cassette portion so as to release the fixing between the rear end regulating member and the second cassette portion, and when the third fixed portion is released at the predetermined position , the second fixed portion is configured to release the fixing of the rear end regulating member by either the an operation of which the operating portion is press-operated in the shortening direction or the operation of which the operating portion is press-operated in the extending direction .