Sheet stacking apparatus, image forming system, and conveyance control method

Abstract

A sheet stacking apparatus includes: a sheet stacker capable of stacking a sheet; a sheet conveyer that conveys the sheet to the sheet stacker; an openable member that can be opened/closed at time of taking out the sheet stacked on the sheet stacker; and a hardware processor that controls the sheet conveyer so as to convey the sheet to the sheet stacker in a case where an opened/closed state of the openable member is an intermediate state between a fully-opened state and a fully-closed state.

What is claimed is: 
     
         1 . A sheet stacking apparatus comprising:
 a sheet stacker capable of stacking a sheet;   a sheet conveyer that conveys the sheet to the sheet stacker;   an openable member that can be opened/closed at time of taking out the sheet stacked on the sheet stacker; and   a hardware processor that controls the sheet conveyer so as to convey the sheet to the sheet stacker in a case where an opened/closed state of the openable member is an intermediate state between a fully-opened state and a fully-closed state.   
     
     
         2 . The sheet stacking apparatus according to  claim 1 , wherein in a case where that opened/closed state of the openable member is the fully-closed state, the hardware processor controls the sheet conveyer to convey the sheet to the sheet stacker, whereas in a case where the opened/closed state of the openable member is the fully-opened state, the hardware processor controls the sheet conveyer so as not to convey the sheet to the sheet stacker. 
     
     
         3 . The sheet stacking apparatus according to  claim 1 , wherein
 the sheet stacker includes:   a first stacking tray capable of stacking the sheet conveyed from the sheet conveyer; and   a second stacking tray that receives the sheet stacked on the first stacking tray and is taken out of the sheet stacking apparatus in a state where the sheet is stacked on the second stacking tray, and   further provided are:   a first mover that moves the first stacking tray toward the second stacking tray; and   a second mover that moves the second stacking tray to the outside of the sheet stacking apparatus.   
     
     
         4 . The sheet stacking apparatus according to  claim 3 , further comprising a first detector that detects an opened/closed state of the openable member. 
     
     
         5 . The sheet stacking apparatus according to  claim 4 , wherein
 the first detector includes:   a fully-closed state detector that detects whether or not the opened/closed state of the openable member is the fully-closed state; and   a fully-opened state detector that detects whether or not the opened/closed state of the openable member is the fully-opened state, and   in a case where the fully-closed state detector detects that the opened/closed state of the openable member is not the fully-closed state and in a case where the fully-opened state detector detects that the opened/closed state of the openable member is not the fully-opened state, the hardware processor determines that the opened/closed state of the openable member is the intermediate state.   
     
     
         6 . The sheet stacking apparatus according to  claim 5 , further comprising
 a second detector that detects a position of the second stacking tray, wherein   in a case of determining that the opened/closed state of the openable member is the intermediate state, the hardware processor determines, in accordance with a detection result of the second detector, whether or not to convey the sheet to the sheet stacker.   
     
     
         7 . The sheet stacking apparatus according to  claim 6 , wherein
 the fully-closed state detector, the fully-opened state detector, and the second detector respectively include switches in each of which an ON/OFF state is switched in accordance with an opened/closed state of the openable member and a position of the second stacking tray.   
     
     
         8 . The sheet stacking apparatus according to  claim 7 , wherein the hardware processor controls the sheet conveyer on a basis of a combination of the ON/OFF states of the switches. 
     
     
         9 . The sheet stacking apparatus according to  claim 7 , wherein the switches are mechanical switches in each of which the ON/OFF state is switched by a mechanical motion. 
     
     
         10 . An image forming system comprising:
 an image forming apparatus that forms an image on a sheet; and   the sheet stacking apparatus according to  claim 1 , which stacks the sheet on which the image is formed by the image forming apparatus.   
     
     
         11 . A conveyance control method comprising:
 conveying a sheet to a sheet stacker capable of stacking a sheet; and   performing control to convey the sheet to the sheet stacker in a case where an opened/closed state of an openable member is an intermediate state between a fully-opened state and a fully-closed state at time of taking out the sheet stacked on the sheet stacker.