Image forming apparatus

a technology of forming apparatus and forming plate, which is applied in the direction of electrical apparatus, thin material processing, article separation, etc., can solve the problems of image failure, erroneous detection of the sheet size of the sheet set on the manual feed tray, and fear of a decrease in usability

Inactive Publication Date: 2018-04-05
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration effectively prevents image failures and paper jams by ensuring accurate sheet size detection and user confirmation, enhancing usability and operational reliability.

Problems solved by technology

In this case, each time the user sets a sheet on the manual feed tray, the user needs to set the sheet size through the operation portion, and hence there has been a fear for a decrease in usability.
When a sensor arranged in the conveyance direction of the sheet fails, and a sheet to be subjected to copying or printing is set on the manual feed tray, the sheet size of the sheet set on the manual feed tray is erroneously detected.
As a result, remaining toner that has not been transferred onto the sheet is adhered to members of an image forming portion, which causes an image failure such as marking back during image forming processing on the subsequent sheet.
The sensor arranged in the conveyance direction of the sheet may fail and be stuck in an off state.
As a result, the sheet size determined by the image forming apparatus is smaller in length than the sheet size of the fed sheet in the conveyance direction, and it may be determined that a paper jam occurs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0027](Image Forming Apparatus)

[0028]FIG. 1 is a system block diagram of an image forming apparatus according to a first embodiment of the present invention, and FIG. 2 is a sectional view of an image forming apparatus 100 and a scanner portion 101 according to this embodiment. With reference to FIG. 1 and FIG. 2, a basic configuration is described. A control portion 300 illustrated in FIG. 1 includes a CPU 301, a ROM 302, a RAM 303, and an EEPROM 304. When, for example, an instruction (hereinafter referred to as “job”) to start a printing operation is input to the CPU 301 through a user interface (UI) of an operation portion 330 (hereinafter referred to simply as “operation portion 330”), the CPU 301 starts the printing operation. The CPU 301 can drive and control, via an I / O 307, a conveyance motor 145, a fixing motor 173, a conveyance motor 146, a manual feed conveyance motor 147, a discharge motor 148, and a discharge motor 149. Further, the CPU 301 can detect, via the I / O 307, ...

second embodiment

[0076](Manual Feed Size Detection Alarm Screen)

[0077]Referring to FIG. 9 and FIG. 10, the second embodiment is now described. FIG. 9 illustrates a screen for prompting the user to check temporary placement and the like. This screen is displayed when it is determined that the size detection for the sheet on the manual feed tray 210 cannot be normally carried out in the processing described with reference to FIG. 6. In this embodiment, the following cases are assumed as the case in which the size detection for the sheet cannot be normally carried out by the sensors arranged on the manual feed tray 210. A first case is a case in which at least one of the manual feed sheet length sensor 218 and the manual feed sheet length sensor 219 fails. A second case is a case in which a sheet other than the sheet subjected to the printing or an object (hereinafter referred to as “foreign matter”) is temporarily placed on the manual feed tray 210. The temporary placement refers to placement of a she...

third embodiment

[0084](Selection of Screen)

[0085]Referring to FIG. 11 and FIG. 12, a third embodiment of the present invention is now described. FIG. illustrates a screen displayed on the display portion 334 when the sheet size is determined to be indefinite after the size detection for the sheet is carried out by the sensors arranged on the manual feed tray 210. The screen of FIG. 11 is displayed when the CPU 301 determines that the sheet size is indefinite. This screen functions as a selecting unit configured to select, in advance, which of the manual feed sheet size display screen 500 and the manual feed sheet size designation screen 600 is to be displayed on the display portion 334 of the operation portion 330. A screen setting screen 1200 for selecting, in advance, the screen displayed when the sheet size on the manual feed tray 210 is indefinite includes two selection buttons. Specifically, the screen setting screen 1200 includes a selection button 1201 for selecting the manual feed sheet siz...

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PUM

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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.

Description

[0001]This application is a Continuation of U.S. application Ser. No. 14 / 857,013, filed Sep. 17, 2015, which claims the benefit of Japanese Patent Application No. 2014-207387, filed Oct. 8, 2014, which are hereby incorporated by reference herein in their entirety.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to an image forming apparatus configured to form an image on a fed sheet.Description of the Related Art[0003]Hitherto, an image forming apparatus such as a copying machine or a printer includes a sheet feeding cassette in an apparatus main body so that copying or printing can be carried out for a sheet continuously. A size and a type of the sheet to be used greatly depend on an environment in which a user uses the image forming apparatus. To address such a requirement, the image forming apparatus is provided with a plurality of sheet feeding cassettes. Even when the image forming apparatus includes a plurality of sheet feeding cassettes, th...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H04N1/00B65H1/26B65H7/02
CPCB65H2511/52B65H2511/515B65H2511/51B65H1/266H04N2201/0094H04N1/00482B65H2511/10B65H7/02B65H2553/82B65H2220/01B65H2220/03B65H2220/04
InventorTAKAHASHI, KEITAIWADATE, SHINNOSUKEKAI, TERUHITONISHIHARA, HIROTOKUMAGAI, KENZOSHIMURA, HIROMI
OwnerCANON KK