An image forming apparatus includes an image forming engine, a re-conveyance path configured to guide a sheet, on which an image is formed by the image forming engine, to be switched back and re-conveyed toward the image forming engine, a discharge tray, a discharge path configured to guide the sheet in a sheet discharge direction toward the discharge tray, a stack lever configured to contact a top surface of the sheet on the discharge tray and press the sheet toward the discharge tray, and a guide member configured to form a part of the re-conveyance path, extend up to a position downstream of the stack lever in the sheet discharge direction above the stack lever, and guide the sheet being conveyed along the re-conveyance path, between the guide member and the stack lever.

An image forming apparatus employing an electrophotographic image forming unit and an inkjet image forming unit, thereby being capable of printing an image on each of a front surface and the back surface of a recording medium.

A sheet conveying apparatus includes a paper re-feeding path, a switching member, a reversing roller, a paper discharge roller, a motor, and a revolution control mechanism. The switching member can be switched between a first position and a second position. The reversing roller can reverse a revolving direction thereof between a first revolving direction and a second revolving direction. The paper discharge roller revolves in a third revolving direction for conveying the sheet in a third conveying direction. The motor reverses the revolving direction of the reversing roller and switches the position of switching member by reversing the revolving direction thereof. The revolution control mechanism revolves the paper discharge roller in the third revolving direction with the revolution of the motor, regardless of the reversing of the revolving direction of the motor.

A sheet conveying apparatus installed in an image forming apparatus according to the present disclosure includes a first guide member provided to a rear cover and configured to guide a sheet along a conveying path, a second guide member provided to the rear cover and configured to be movable between a first position where the sheet is guided to a nip of intermediate discharging rollers and a second position farther from the nip in a sheet conveying direction than the first position, and a movement mechanism configured to move the second member. When the rear cover is moved from a closed position toward an opened position, the movement mechanism moves the second guide member from the first position to the second position.

After outputting a first start signal for causing an image forming unit to start formation of an image for a first side of an i-th sheet, a controller causes a feeding member to start feeding of the i-th sheet, and determines whether or not the i-th sheet has already been detected by a detector. In a case where the i-th sheet has been detected before a first predetermined time has elapsed, the controller outputs a second start signal for causing the image forming unit to start formation of an image for second side of an (i1)th sheet. In a case where the i-th sheet has not been detected before the first predetermined time has elapsed, the controller outputs the second start signal after the i-th sheet is detected.

The image forming apparatus includes a main body, a pick-up device to pick up a printing medium, a developing device to develop an image on a side of the printing medium picked up by the pick-up device, a fixing device to fix the image developed on the side of the printing medium, a paper reverse device to guide the printing medium from a transfer direction of the printing medium passing through the fixing device, through a reverse path to the developing device and the fixing device, to develop and fix another image on other side of the printing medium, a discharging device to discharge the printing medium outside the main body, a post-processing device provided in the main body, and a post-processing path selection device rotatable to a first position to guide the printing medium through a discharge path to guide the printing medium passing through the fixing device to the discharging device and a second position to guide the printing medium from the discharge path to a post-processing path branched from the discharge path, to guide the printing medium to the post-processing device.

The number of circulatable sheets and the conveying speed of a sheet are decided by referring to a storage unit which stores the number of circulatable sheets and the conveying speed of a sheet in correspondence with the type and size of a sheet, and the resolution of an image to be printed. It is determined whether the conveying speed of the feed surface of a sheet to be fed next to the printing unit and that of a feed surface to be refed next to the printing unit coincide with each other. It is determined whether the conveying speed of the feed surface of the sheet to be fed next to the printing unit and that of the feed surface or the refeed surface of a sheet immediately previously fed to the printing unit differ from each other.

An image forming apparatus employing an electrophotographic image forming unit and an inkjet image forming unit, thereby being capable of printing an image on each of a front surface and the back surface of a recording medium,

An image forming apparatus includes a transfer portion to transfer a toner image to a sheet, a fixing portion to fix the toner image, a reverse conveyance portion to perform a reverse conveyance operation in which the sheet is conveyed to a first direction and thereafter conveyed to a second direction that is opposite to the first direction, and a reverse guide configured to guide the sheet in the reverse conveyance operation. A conveyance guide pair forms a conveyance path through which the sheet subjected to the reverse conveyance operation passes, and guides the sheet toward the transfer portion, and an air blowing portion blows air toward the conveyance path. In addition, a ventilation portion is provided through which air blowing from the air blowing portion toward the reverse guide passes, the air having passed through the ventilation portion flowing along the reverse guide.

An image forming system includes an image former that forms an image on a sheet, a reader that reads the image formed on the sheet by the image former, and a hardware processor that controls a conveyance speed of the sheet at the reader in accordance with a physical property value of the sheet.