Image forming apparatus

Abstract

Provided is an image forming apparatus, including: a manual feed tray on which a recording material is stacked; a first detecting unit; a second detecting unit arranged on an upstream side of the first detecting unit; a third detecting unit arranged on an upstream side of the second detecting unit; a fourth detecting unit detecting a length of the recording material; a display portion; and a control portion determining a size of the recording material based on detection results and causing the display portion to display a first screen displaying the determined size, wherein the control portion causes the display portion to display a second screen for designating the size, when, among the first to third detecting units, a detecting unit located on a downstream side does not detect presence of the recording material and another detecting unit located on an upstream side of the detecting unit, detects the presence.

What is claimed is: 
     
         1 . An image forming apparatus comprising:
 a manual feed tray on which recording material is to be manually stacked;   a first detector configured to detect a presence or absence of the recording material on the manual feed tray;   a second detector arranged on an upstream side of the first detector in a conveyance direction of the recording material, the second detector configured to detect a presence or absence of the recording material on the manual feed tray;   a third detector arranged on an upstream side of the second detector in the conveyance direction of the recording material, the third detector configured to detect a presence or absence of the recording material on the manual feed tray;   a display portion configured to display information; and   a controller configured to determine a size of the recording material based on detection results of the first detector, the second detector and the third detector, and to cause the display portion to display the determined size of the recording material,   wherein the controller is further configured to cause the display portion to display a message representing that the size of the recording material has not been detected in a case that, among the first detector, the second detector and the third detector, a detection result of a downstream-side detector located on a downstream side in the conveyance direction does not represent the presence of the recording material and a detection result of an upstream-side detector located on an upstream side of the downstream-side detector with respect to the conveyance direction represents the presence of the recording material.   
     
     
         2 . The image forming apparatus according to  claim 1 , wherein the controller is further configured to cause the display portion to display the message in a case that detection results of the first detector and the third detector represent the presence of the recording material and a detection result of the second detector does not represent the presence of the recording material. 
     
     
         3 . The image forming apparatus according to  claim 1 , wherein the controller is further configured to cause the display portion to display the message in a case that a detection result of the first detector does not represent the presence of the recording material and a detection result of the second detector represents the presence of the recording material. 
     
     
         4 . The image forming apparatus according to  claim 1 , wherein the controller is further configured to cause the display portion to display another message for prompting to check the recording material on the manual feed tray along with the message. 
     
     
         5 . The image forming apparatus according to  claim 1 , wherein the controller is further configured to cause the display portion to display the determined size of the recording material in a case that detection results of all of the first detector, the second detector and the third detector represent the presence of the recording material. 
     
     
         6 . The image forming apparatus according to  claim 1 , wherein the controller is further configured to cause the display portion to display the determined size of the recording material in a case that, among detection results of the first detector, the second detector and the third detector, a detection result of a downstream-side detector located on a downstream side in the conveyance direction represents the presence of the recording material and a detection result of an upstream-side detector located on an upstream side of the downstream-side detector with respect to the conveyance direction does not represent the presence of the recording material. 
     
     
         7 . The image forming apparatus according to  claim 6 , further comprising a fourth detector configured to detect a length of the recording material on the manual feed tray in a direction orthogonal to the conveyance direction, wherein the controller is configured to determine the size of the recording material based on the detection results of the first detector, the second detector, the third detector, and the fourth detector. 
     
     
         8 . The image forming apparatus according to  claim 7 , wherein:
 the manual feed tray has regulating plates configured to regulate both end portions of the recording material in the direction orthogonal to the conveyance direction, and   the fourth detector is configured to output a value corresponding to positions of the regulating plates in conjunction with an operation of the regulating plates.