Abstract: An image forming apparatus includes: a first image former that forms a first image in an image forming region of a recording medium; and a second image former that forms a second image in a margin region to cause a height difference between the image forming region where the first image is formed and the margin region to be reduced.

Abstract: An optional device is for an electrical machine. The optional device is mountable to the electrical machine without electrical connection to the electrical machine. The optional device includes a duct, an air flow sensor, an air purifier, and a controller. Through the duct, an air flow containing an exhaust gas from the electrical machine is guided. The air flow sensor is configured to detect presence or absence of the exhaust gas from the electrical machine. The air purifier is configured to purify the exhaust gas and discharge the purified exhaust gas into an atmosphere. The controller is configured to control an operation of the air purifier based on an output from the air flow sensor.

Abstract: Provided is an image forming apparatus provided with a sheet accommodating member that accommodates a sheet and is capable of being inserted into and withdrawn from an apparatus main body, and the image forming apparatus includes: a moving member movably supported in the sheet accommodating member; a charge member that is charged with energy by a movement of the moving member; and a retractor that retracts the sheet accommodating member into the apparatus main body by the energy charged in the charge member, when the sheet accommodating member is inserted into the apparatus main body.

Abstract: Provided is an image forming apparatus provided with a sheet accommodating member that accommodates a sheet and is capable of being inserted into and withdrawn from an apparatus main body, and the image forming apparatus includes: a moving member movably supported in the sheet accommodating member; a charge member that is charged with energy by a movement of the moving member; and a retractor that retracts the sheet accommodating member into the apparatus main body by the energy charged in the charge member, when the sheet accommodating member is inserted into the apparatus main body.

Abstract: An air flow sensor includes a case, a to-be-detected object, and a detector. The case includes an intake port and an exit port through which air is to flow. The to-be-detected object is located at a first position in the case when the air flowing from the intake port to the exit port has lower than a predetermined level of pressure, and is movable from the first position receiving the air when the air has equal to or higher than the predetermined level of pressure. The detector is disposed outside the case and is configured to detect a movement of the to-be-detected object and output an electrical signal.

Abstract: An electrical machine includes an exhaust fan and an exhaust port on which an optional device is mounted. The optional device includes a duct, an electric fan, and an air flow sensor. Through the duct, an exhaust gas from the exhaust port is guided. The electric fan draws in the exhaust gas flowing through the duct and discharges the exhaust gas into an atmosphere. The air flow sensor detects presence or absence of the exhaust gas flowing from the electrical machine. The air flow sensor includes an air path partitioned from an inside of the duct by a partition wall. The air path includes an exhaust gas and an exit port. The exhaust gas intake port includes an opening facing the exhaust gas. The exit port communicates with the atmosphere at a position outside the duct.

Abstract: A toner supply device includes a toner storage, a supply opening, a toner conveyer, a toner supply opening, and an air passage. The toner storage stores toner. Through the supply opening, the toner is supplied to a developing device. The toner conveyer includes an area of space different from an area of space of the toner storage. The toner conveyer conveys the toner stored in the toner storage to supply the toner from the supply opening to the developing device. Through the toner supply opening, the toner is supplied from the toner storage to the toner conveyer. The air passage is at a position different from the toner supply opening. The air passage connects the toner storage to the toner conveyer so as to allow air flowing through the supply opening into the toner conveyer to be supplied to the toner storage through the air passage.

Abstract: A sheet conveying device includes: a curved conveyance path; and a pair of downstream side rollers that lies on the downstream side with respect to the curved conveyance path, and catches the sheet conveyed from the upstream side with respect to the curved conveyance path and reaching the curved conveyance path, wherein the curved conveyance path includes a movable guide movable between a first position and a second position, at the first position, the movable guide forms an outer circumferential wall of the curved conveyance path, and guides a tip of the sheet in such a direction that the sheet conveyed to the curved conveyance path travels toward the pair of downstream side rollers, and at the second position, a summit portion of a curve of the outer circumferential wall is retracted toward the outside in a radial direction of the curve with respect to the first position.

Abstract: An optional device is for an electrical machine. The electrical machine includes an exhaust fan and an exhaust port on which the optional device is mounted. The optional device includes a duct, an electric fan, and an air flow sensor. Through the duct, an exhaust gas from the exhaust port is guided. The electric fan draws in the exhaust gas flowing through the duct and discharges the exhaust gas into an atmosphere. The air flow sensor detects presence or absence of the exhaust gas flowing from the electrical machine. The air flow sensor includes an air path partitioned from an inside of the duct by a partition wall. The air path includes an exhaust gas and an exit port. The exhaust gas intake port includes an opening facing the exhaust gas. The exit port communicates with the atmosphere at a position outside the duct.

Abstract: An air flow sensor includes a case, a to-be-detected object, and a detector. The case includes an intake port and an exit port through which air is to flow. The to-be-detected object is located at a first position in the case when the air flowing from the intake port to the exit port has lower than a predetermined level of pressure, and is movable from the first position receiving the air when the air has equal to or higher than the predetermined level of pressure. The detector is disposed outside the case and is configured to detect a movement of the to-be-detected object and output an electrical signal.

Abstract: An optional device is for an electrical machine. The optional device is mountable to the electrical machine without electrical connection to the electrical machine. The optional device includes a duct, an air flow sensor, an air purifier, and a controller. Through the duct, an air flow containing an exhaust gas from the electrical machine is guided. The air flow sensor is configured to detect presence or absence of the exhaust gas from the electrical machine. The air purifier is configured to purify the exhaust gas and discharge the purified exhaust gas into an atmosphere. The controller is configured to control an operation of the air purifier based on an output from the air flow sensor.

Abstract: A sheet conveying device includes: a curved conveyance path; and a pair of downstream side rollers that lies on the downstream side with respect to the curved conveyance path, and catches the sheet conveyed from the upstream side with respect to the curved conveyance path and reaching the curved conveyance path, wherein the curved conveyance path includes a movable guide movable between a first position and a second position, at the first position, the movable guide forms an outer circumferential wall of the curved conveyance path, and guides a tip of the sheet in such a direction that the sheet conveyed to the curved conveyance path travels toward the pair of downstream side rollers, and at the second position, a summit portion of a curve of the outer circumferential wall is retracted toward the outside in a radial direction of the curve with respect to the first position.

Abstract: A toner supply device includes a toner storage, a supply opening, a toner conveyer, a toner supply opening, and an air passage. The toner storage stores toner. Through the supply opening, the toner is supplied to a developing device. The toner conveyer includes an area of space different from an area of space of the toner storage. The toner conveyer conveys the toner stored in the toner storage to supply the toner from the supply opening to the developing device. Through the toner supply opening, the toner is supplied from the toner storage to the toner conveyer. The air passage is at a position different from the toner supply opening. The air passage connects the toner storage to the toner conveyer so as to allow air flowing through the supply opening into the toner conveyer to be supplied to the toner storage through the air passage.