Abstract: An image forming apparatus includes an image bearing member, a developing portion, a transfer member, a conveyance portion, a guide member disposed on the same side as the image bearing member with respect to a conveyance path, the guide member being configured to guide the sheet conveyed by the conveyance portion toward the transfer portion, a rotary member disposed to oppose the guide member and configured to be movable between a first position and a second position, and an urging portion. An urging force of the urging portion is set such that the rotary member is positioned at the first position in a case where a first sheet having a first stiffness is conveyed, and such that the rotary member is positioned at the second position by being pushed by a second sheet having a second stiffness.

Abstract: An image forming apparatus includes an image bearing member, a developing portion, a transfer member, a conveyance portion, a guide member disposed on the same side as the image bearing member with respect to a conveyance path, the guide member being configured to guide the sheet conveyed by the conveyance portion toward the transfer portion, a rotary member disposed to oppose the guide member and configured to be movable between a first position and a second position, and an urging portion. An urging force of the urging portion is set such that the rotary member is positioned at the first position in a case where a first sheet having a first stiffness is conveyed, and such that the rotary member is positioned at the second position by being pushed by a second sheet having a second stiffness.

Abstract: The image formation apparatus has a plurality of cooling fans inside the main body of the apparatus and comprises an error detecting function of detecting occurrence of an error such as a sheet jam, and switches between operation and non-operation of the cooling fans or changes a rotation number thereof in operation according to a form of a detected error. Thus, it allows optimization of in-apparatus the temperature in the apparatus control on error occurrence and temperature control of each inside portion of the apparatus on sheet jam occurrence so as to solve various problems relating to in the apparatus temperature status on the error occurrence.

Abstract: The image formation apparatus has a plurality of cooling fans inside the main body of the apparatus and comprises an error detecting function of detecting occurrence of an error such as a sheet jam, and switches between operation and non-operation of the cooling fans or changes a rotation number thereof in operation according to a form of a detected error. Thus, it allows optimization of in-apparatus the temperature in the apparatus control on error occurrence and temperature control of each inside portion of the apparatus on sheet jam occurrence so as to solve various problems relating to in the apparatus temperature status on the error occurrence.

Abstract: An image forming apparatus includes a plurality of image forming units, each having an image carrier for transferring images of each color to a transfer medium. Each of the image forming units has an exposing device for exposing the image carrier, and wherein the image forming units adjacent to one another are in contact with one another.

Abstract: The present invention provides an image heating apparatus that has a movable member, a guide member for guiding a movement of the movable member, and a back up member for forming a nip portion with the guide member via the movable member, wherein a recording material bearing an image at said nip portion is pinched and conveyed, the image on the recording material is heated by a heat from the movable member side, and wherein the guide member has a recess portion in a guide portion different from the nip portion.

Abstract: The present invention relates to an image forming apparatus comprising a plurality of image forming units, each having an image carrier for transferring images of each color to a transfer medium. Each of the image forming units has an exposing means for exposing the image carrier, and wherein the image forming units adjacent to one another are in contact with one another.

Abstract: The present invention provides an image heating apparatus that has a movable member, a guide member for guiding a movement of the movable member, and a back up member for forming a nip portion with the guide member via the movable member, wherein a recording material bearing an image at said nip portion is pinched and conveyed, the image on the recording material is heated by a heat from the movable member side, and wherein the guide member has a recess portion in a guide portion different from the nip portion.

Abstract: An image forming apparatus having a cartridge includes an image forming device acting on an image bearing member and a driving force transmitting device which is adapted to transmit a driving force from an apparatus side to a cartyridge side and which is separable from the image forming device. The apparatus also includes a drive source. The image forming device and the driving force transmitting device are integrally mountable to the apparatus.

Abstract: The present invention provides a sheet supply apparatus comprising a sheet containing device for containing a plurality of sheets, a sheet positioning member provided in the sheet containing device to position the sheets in a widthwise direction thereof by abutting against a side edge of the contained sheets, and a supply device for feeding out the sheets positioned by the sheet positioning member. Wherein the sheet positioning member is previously inclined at a predetermined angle toward a direction opposite to a direction that the sheet positioning member may be inclined by the deflection of the sheet containing device due to the weight of the sheets contained in the sheet containing device.

Abstract: A process cartridge integrally supports an electrophotographic photosensitive member and a plurality of developing units and removable with respect to an image forming apparatus. The driving force from the image forming apparatus can be selectively transmitted to any one of the developing units and the transmission of the driving force to all of the developing units is blocked during the non-image forming process. Thus, the operability of dismounting of the cartridge from the image forming apparatus is improved.