Paper feeder and image forming device

Abstract

A paper feeder includes a sheet container including a platen member on which sheet-like recording media is placed, the platen member having one end portion on an upstream side of a paper feed direction rotatably supported to a spindle, such that the other end portion on a downstream side of the paper feed direction is lifted, and a paper feed member which draws and feeds the sheet-like recording media, and the sheet container includes a stepped portion which presses down the downstream side of the paper feed direction of the platen member when inserting the sheet container in the direction opposite to the paper feed direction, and a sliding portion which maintains the pressing down.

1 . A paper feeder, comprising:
 a sheet container including a platen member on which sheet-like recording media is placed, the platen member having one end portion on an upstream side of a paper feed direction rotatably supported to a spindle, such that the other end portion on a downstream side of the paper feed direction is lifted; and   a paper feed member which draws and feeds the sheet-like recording media,   the sheet container including a stepped portion which presses down the downstream side of the paper feed direction of the platen member when inserting the sheet container in the direction opposite to the paper feed direction, and a sliding portion which maintains the pressing down.   
     
     
         2 . The paper feeder according to  claim 1 , wherein the stepped portion and the sliding portion are pressed to a locking member by a biasing member which elastically supports the platen member. 
     
     
         3 . The paper feeder according to  claim 1 , wherein the stepped portion and the sliding portion are integrally provided in the platen member. 
     
     
         4 . The paper feeder according to  claim 2 , wherein the stepped portion and the sliding portion are integrally provided in the platen member. 
     
     
         5 . The paper feeder according to  claim 1 , wherein the stepped portion is provided above a straight line connecting the spindle of the platen member and a leading end of the platen member. 
     
     
         6 . The paper feeder according to  claim 1 , wherein a relationship of Ls/L>f/F is satisfied where a biasing force of the platen member to the paper feed member is F, a sliding load in the platen member and the sliding portion is f, a distance from the spindle of the platen member to a biasing position is Ls, and a distance from the spindle to the stepped portion is L. 
     
     
         7 . The paper feeder according to  claim 1 , wherein the sheet container includes a control member which controls a top sheet of the sheet-like recording media, and a relationship of Lt/L>Y/y is satisfied where a height from a surface from which the sheet-like recording media is fed in the platen member to the control member is Y, a height of the stepped portion y, a distance from the spindle of the platen member to a leading end position of the platen member is Lt, and a distance from the spindle to the stepped portion is L. 
     
     
         8 . The paper feeder according to  claim 1 , wherein the stepped portion is formed in a circular shape and the circular stepped portion is concentric with the spindle of the platen member. 
     
     
         9 . An image forming device comprising the paper feeder set forth in  claim 1 .