# US 2019/0094756 A1 · Image forming apparatus with removable developer container > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0094756 A1 - Document ID: US20190094756A1 - Status: Published application - Kind: A1 - Application number: 16/139,457 - Filed: 2018-09-24 - Published: 2019-03-28 - Earliest claimed: 2017-09-28 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Hiroyuki Eda - Web page: https://patentgrep.com/patent/US20190094756A1 ## CPC - G03G 15/0865: {Arrangements for supplying new developer} - G03G 15/5016: {User-machine interface; Display panels; Control console} - G03G 15/602: {for transporting} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An image forming apparatus prevents sheets from remaining inside the image forming apparatus even when a container that is not empty is replaced with another container. The image forming apparatus includes a mount to which a container containing developer is mounted, and a replenishing unit replenishing an image forming unit with the developer from the mounted container. In a case where the mounted container is replaced with another one without replacement of the container necessary during image formation of the image forming unit, a controller suspends feeding of a sheet, discharges the sheet remaining in a conveying path, and disables an image forming operation. A display displays a screen for prompting replacement of the mounted container if replacement of the container is necessary, and displays a screen for prompting re-mounting of the replaced container in a case where the mounted container is replaced without replacement of the container necessary. ## Claims ### Claim 1 An image forming apparatus comprising: a conveying unit configured to feed a sheet to convey the sheet along a conveying path; an image forming unit configured to form an image on the sheet using a developer; a mount to which a container is mounted, the container containing the developer; a replenishing unit configured to replenish the image forming unit with the developer from the mounted container; a controller configured to judge whether or not replacement of the mounted container is necessary, and in a case where the mounted container is replaced with another one without replacement of the container necessary during image formation operation by the image forming unit, (i) suspend feeding of the sheet by the conveying unit, (ii) discharge the sheet remaining in the conveying path, and (iii) disable an image forming operation of the image forming unit; and a display configured to display a screen for prompting replacement of the mounted container if replacement of the container is necessary, and display a screen for prompting re-mounting of the replaced container in a case where the mounted container is replaced with another one without replacement of the container necessary. ### Claim 2 (depends on 1) The image forming apparatus according to claim 1, wherein the image forming unit forms the image on the sheet remaining in the conveying path before the controller disables the image forming operation, in a case where the mounted container is replaced with another one without replacement of the mounted container necessary during the image forming operation by the image forming unit. ### Claim 3 (depends on 1) The image forming apparatus according to claim 1, further comprising a sensor configured to detect the developer in the image forming unit, wherein the controller carries out a replenishing process in a case where the sensor detects the developer in the image forming unit, and the controller judges that replacement of the mounted container is necessary in a case where the replenishing process is carried out by a predetermined number of turns without the sensor detecting the developer in the image forming unit. ### Claim 4 (depends on 1) The image forming apparatus according to claim 1, wherein the controller causes the image forming unit to resume the image forming operation in a case where the image forming unit is re-mounted with a screen for prompting re-mounting of the replaced container being displaced on the display. ### Claim 5 (depends on 1) The image forming apparatus according to claim 1, wherein the display displays another screen in a case where the replaced container is re-mounted with a screen for prompting re-mounting of the replaced container being displaced on the display. ### Claim 6 (depends on 1) The image forming apparatus according to claim 1, wherein the display hides the screen for prompting re-mounting of the replaced container in a case where the replaced container is re-mounted with a screen for prompting re-mounting of the replaced container being displaced on the display. ### Claim 7 (depends on 1) The image forming apparatus according to claim 1, further comprising a reader configured to read identification information of the container mounted in the mount, wherein the controller judges whether or not the mounted container is replaced, based on the identification information read by the reader. ### Claim 8 (depends on 1) The image forming apparatus according to claim 1, further comprising a sensor configured to detect the developer in the image forming unit, wherein the image forming unit enables the image forming operation until the sensor does not detect the developer in the image forming unit in a case where the container has been removed from the container. ### Claim 9 (depends on 1) The image forming apparatus according to claim 1, further comprising a sensor configured to detect the developer in the image forming unit, wherein the display displays a screen for prompting mounting of the container on the mount in a case where the sensor has not detected the developer in the image forming unit with the container removed from the mount. ### Claim 10 (depends on 1) The image forming apparatus according to claim 1, wherein the controller causes the image forming unit not to suspend the image forming operation even if the mounted container is removed without replacement of the container necessary during image formation operation by the image forming unit. ### Claim 11 (depends on 1) The image forming apparatus according to claim 1, wherein the display does not display the screen for prompting mounting of the replaced container even if the mounted container is removed without replacement of the container necessary during image formation operation by the image forming unit.