Paper feeding apparatus with paper size detectors

Abstract

A paper feeding apparatus includes a cassette main body that stacks a paper therein, a sidewall that moves in a width direction of the cassette main body, an end wall that moves in a longitudinal direction of the cassette main body, a first movable member that is connected at one end to the sidewall and rotates around a shaft axially fixed to the cassette main body in connection with the sidewall, a second movable member that is connected at one end to the end wall and rotates around a shaft axially fixed to the cassette main body in connection with the end wall, a first detection unit that has a plurality of detection members and detects the size of the paper in the width direction, and a second detection unit that has a plurality of detection members and detects the size of the paper in the longitudinal direction.

1 . A paper feeding apparatus comprising:
 a cassette main body that stacks a paper therein;   a sidewall that moves in a width direction of the cassette main body;   an end wall that moves in a longitudinal direction of the cassette main body;   a first movable member that rotates around a shaft axially fixed to the cassette main body in connection with the sidewall, has a first detection portion and is connected to the sidewall;   a second movable member that rotates around a shaft axially fixed to the cassette main body in connection with the end wall, has a second detection portion and is connected to the end wall;   a first detection unit that detects the size of the paper in the width direction according to the first detection portion;   a second detection unit that detects the size of the paper in the longitudinal direction according to the second detection portion;   a paper sensor that detects presence of the paper when the sidewall and the end wall are moved to positions to come into contact with the paper and is provided on wall surfaces near at least one of the sidewall and the end wall; and   a display that, when the paper sensor determines paper absence, displays information that at least one of the sidewall and the end wall is not set in accordance with the paper size.   
     
     
         2 . The apparatus of  claim 1 ,
 wherein, when the paper sensor determines paper presence, and the size of the paper detected by the first detection unit and the second detection unit is not consistent with a predetermined size, the display displays that the size of the paper is to be inputted.   
     
     
         3 . The apparatus of  claim 2 , further comprising:
 a storage unit that, when the paper size is inputted, stores combination information of a patterns detected by the first detection unit and a patterns detected by the second detection unit for the paper size in association with the paper size; and   a control unit that detects the paper size by comparing the patterns detected by the first detection unit and the patterns detected by the second detection unit with the combination information stored in the storage unit and displays result of detecting the paper size.   
     
     
         4 . The apparatus of  claim 3 ,
 wherein the control unit controls to convey the paper by paper feed rollers when the control unit detects that the paper size is correct.   
     
     
         5 . The apparatus of  claim 4 ,
 wherein, when the paper sensor determines paper absence and the control unit discriminates the paper size, the display displays information that the size of the paper stacked in the cassette main body is different from the paper size based on the combination information.   
     
     
         6 . The apparatus of  claim 1 ,
 wherein the paper sensor has an actuator.