Medium stacking device and image forming apparatus

Abstract

A medium stacking device includes a medium stacking part stacking a medium, and a first movement part movably provided with respect to the medium stacking part. The first movement part has a first medium restriction part restricting a position of the medium, and a first movement restriction parts including a plurality of restriction members, each of which engaging with the medium stacking part and restricting a direction of the movement of the first movement part.

1 . A medium stacking device, comprising:
 a medium stacking part stacking a medium; and   a first movement part movably provided with respect to the medium stacking part;   
       wherein
 the first movement part has
 a first medium restriction part restricting a position of the medium, and 
 a first movement restriction part including a plurality of restriction members, each of which engaging with the medium stacking part and restricting a direction of the movement of the first movement part. 
 
 
     
     
         2 . The medium stacking device according to  claim 1 , wherein
 the restriction members are provided substantially in parallel with respect to a medium carrying direction, and   the restriction members substantially vertically extend with respect to the medium carrying direction.   
     
     
         3 . The medium stacking device according to  claim 1 , wherein
 each of the restriction members includes an abutment part, and   the medium stacking part has a support part contacting the abutment part.   
     
     
         4 . The medium stacking device according to  claim 3 , wherein
 each of the restriction members has a bias part for biasing the abutment part against the support part.   
     
     
         5 . The medium stacking device according to  claim 1 , further comprising:
 a gear part rotatably held by the medium stacking part, wherein one of the restriction members has a tooth part engaging with the gear part.   
     
     
         6 . The medium stacking device according to  claim 2 , wherein
 the first movement restriction part has two of the restriction members, and one of the restriction members is positioned at an upstream side along the medium carrying direction, the other of the restriction members is positioned at a downstream side along the medium carrying direction.   
     
     
         7 . The medium stacking device according to  claim 1 , comprising:
 a second movement part disposed so as to face the first movement part and movably provided with respect to the medium stacking part, wherein   the second movement part has
 a second medium restriction part restricting the position of the medium, and 
 a second movement restriction part including a plurality of other restriction members, each of which engaging with the medium stacking part and restricting a direction of the movement of the second movement part. 
   
     
     
         8 . The medium stacking device according to  claim 7 , wherein
 the restriction members of the first medium restriction part and the restriction members of the second medium restriction part are provided substantially in parallel each other, and   the restriction members of the first movement restriction part substantially vertically extend with respect to the medium carrying direction and toward the second medium restrict part,   the restriction members of the second movement restriction part substantially vertically extend with respect to the medium carrying direction and toward the first medium restriction part.   
     
     
         9 . The medium stacking device according to  claim 8 , wherein
 each of the first movement restriction part and the second movement restriction part includes an abutment part, and   the medium stacking part has two support parts, one support part contacting the abutment part of the first movement restriction part, the other support part contacting the abutment part of the second movement restriction part.   
     
     
         10 . The medium stacking device according to  claim 9 , wherein
 each of the first movement restriction part and the second movement restriction part has a bias part for biasing one of the abutment parts into the corresponding support part .   
     
     
         11 . The medium stacking device according to  claim 8 , further comprising:
 a first gear part and a second gear part rotatably held by the medium stacking part and provided along the medium carrying direction and at a substantially middle of the first and second medium restriction parts, wherein   the restriction members of the first movement restriction part respectively have a tooth part engaging with the first gear part and another tooth part engaging with the second gear part, and   the restriction members of the second movement restriction part respectively have a tooth part engaging with the first gear part and another tooth part engaging with the second gear part.   
     
     
         12 . The medium stacking device according to  claim 7 , wherein
 the first movement part and the second movement part have an identical shape.   
     
     
         13 . The medium stacking device according to  claim 8 , further comprising:
 a transferring part engaging with the first gear part and the second gear part and linking the first gear part to the second gear part.   
     
     
         14 . An image forming apparatus, comprising:
 the medium stacking part according to  claim 1 .