Image forming apparatus and image forming system

An image forming apparatus to which a toner container is detachably attached and which performs image formation for forming a toner image on a recording material, the image forming apparatus comprising:

• a photosensitive drum;
• a developing container configured to store toner, the developing container provided with a replenishment opening through which the toner is supplied from the toner container to the developing container;
• a developing roller configured to supply the toner stored in the developing container to the photosensitive drum;
• a detection portion configured to detect an amount of the toner stored in the developing container;
• a display portion configured to perform display depending on a detection result of the detection portion, about an amount of the toner in the developing container;
• and
• a control portion configured to control the display portion,
• wherein the control portion controls the detection portion to execute a first detection to reflect, on a display of the display portion, a decrease in the amount of the toner in the developing container due to the image formation, and second detection to reflect, on the display of the display portion, an increase in the amount of the toner in the developing container due to the toner supply,
• wherein the control portion controls the display portion to perform a first display and a second display different from the first display depending on the detection result of the detection portion, and
• wherein the amount of the toner in a case where a display depending on the detection result of the second detection switches from the second display to the first display in the display portion is smaller than the amount of the toner in a case where a display depending on the detection result of the first detection switches from the first display to the second display in the display portion.

An image forming system that performs image formation for forming a toner image on a recording material, the image forming system comprising:

• a toner container configured to store toner;
• and
• an image forming apparatus to which the toner container can be attached, the image forming apparatus comprising:
• an attachment portion to which the toner container can be attached;
• a photosensitive drum;
• a developing container configured to store toner, the developing container provided with a replenishment opening for receiving toner supply from the toner container attached to the attachment portion;
• a developing roller configured to supply the toner stored in the developing container to the photosensitive drum;
• a detection portion configured to detect an amount of the toner stored in the developing container;
• a display portion configured to perform display, depending on a detection result of the detection portion, about an amount of the toner in the developing container;
• and
• a control portion configured to control the display portion,
• wherein the display portion is controlled to, in a case where the detection result is greater than or equal to a first threshold, display a first display, and in a case where the detection result is less than the first threshold and greater than or equal to a second threshold smaller than the first threshold, display a second display different from the first display, and
• wherein a difference between the amount of toner corresponding to the first threshold and the amount of toner corresponding to the second threshold is less than an amount of toner stored in the toner container in an unused state.