Paper post-processing apparatus

Abstract

A paper post-processing apparatus comprises a processing tray section; a post-processing section; a paper discharge tray section; a first chuck section configured to hold the rear end of the paper standing by in the buffer section; a second chuck section configured to hold the rear end of the paper loaded on the processing tray; and a third chuck section configured to hold the rear end of the paper loaded on the paper discharge tray; wherein a next paper is fed onto the paper held by the first chuck section in the buffer section, a paper is fed onto the paper held by the second chuck section from the buffer section in the processing tray section, and a paper is discharged onto the paper on the paper discharge tray held by the third chuck section from the processing tray section in the paper discharge tray section.

What is claimed is: 
     
         1 . A paper post-processing apparatus, comprising:
 a buffer section configured to hold a standby paper fed from an image forming apparatus;   a processing tray section arranged below the buffer section and configured to include a processing tray to which a paper is fed from the buffer section, and be capable of conveying the paper fed from the buffer section and loaded on the processing tray towards a paper discharge direction;   a post-processing section configured to carry out a post-processing on the paper loaded on the processing tray;   a paper discharge tray section configured to include a paper discharge tray to which a paper bundle loaded on the processing tray and subjected to the post-processing is discharged;   a first chuck section configured to hold the rear end of the paper standing by in the buffer section;   a second chuck section configured to hold the rear end of the paper loaded on the processing tray; and   a third chuck section configured to hold the rear end of the paper loaded on the paper discharge tray; wherein   a next paper is fed onto the paper held by the first chuck section in the buffer section, a paper is fed onto the paper held by the second chuck section from the buffer section in the processing tray section, and a paper is discharged onto the paper on the paper discharge tray held by the third chuck section from the processing tray section in the paper discharge tray section.   
     
     
         2 . The paper post-processing apparatus according to  claim 1 , wherein
 the buffer section feeds a plurality of papers loaded on the standby tray to the processing tray by letting the papers fall.   
     
     
         3 . The paper post-processing apparatus according to  claim 1 , wherein
 the buffer section feeds a next paper, in a state of contacting the front end of the paper held by the first chuck section with the paper on the processing tray, onto the paper held by the first chuck section.   
     
     
         4 . The paper post-processing apparatus according to  claim 1 , wherein
 the second chuck section has a structure in which the paper is pressed from above.   
     
     
         5 . The paper post-processing apparatus according to  claim 1 , wherein
 the third chuck section has a paper abutting section which abuts the surface of the rear end of the paper loaded on the paper discharge tray so as to hold the paper through an upward movement of a paper discharge tray which is capable of moving in the vertical direction.   
     
     
         6 . The paper post-processing apparatus according to  claim 2 , wherein
 the second chuck section has a structure in which the paper is pressed from above.   
     
     
         7 . The paper post-processing apparatus according to  claim 3 , wherein
 the second chuck section has a structure in which the paper is pressed from above.   
     
     
         8 . The paper post-processing apparatus according to  claim 2 , wherein
 the third chuck section has a paper abutting section which abuts the surface of the rear end of the paper loaded on the paper discharge tray so as to hold the paper through an upward movement of a paper discharge tray which is capable of moving in the vertical direction.   
     
     
         9 . The paper post-processing apparatus according to  claim 3 , wherein
 the third chuck section has a paper abutting section which abuts the surface of the rear end of the paper loaded on the paper discharge tray so as to hold the paper through an upward movement of a paper discharge tray which is capable of moving in the vertical direction.   
     
     
         10 . The paper post-processing apparatus according to  claim 4 , wherein
 the third chuck section has a paper abutting section which abuts the surface of the rear end of the paper loaded on the paper discharge tray so as to hold the paper through an upward movement of a paper discharge tray which is capable of moving in the vertical direction.