Abstract: An electrophotographic image forming apparatus has a controller configured to store a rotation amount of a motor since the tray is attached to a main body of the image forming apparatus as a stored rotation amount, and move, in response to receipt of a print instruction, a pressing plate by driving the motor in the first mode when a remaining rotation amount is equal to or larger than a particular threshold rotation amount, the remaining rotation amount being a difference between a target rotation amount which is a rotation amount necessary to move the pressing plate from a position when the tray is attached to the main body to the conveying position, and the stored rotation amount, or in the second mode when the remaining rotation amount is less than the particular threshold rotation amount.

Abstract: A sheet feeding device having sheet feed tray configured to support multiple sheets be movably inserted to a main body. A sheet feed roller is configured to contact the sheet supported by the sheet feed tray and rotate to apply a feeding force to feed the sheet in a sheet feed direction. The sheet feed roller is configured to contact the sheet feed tray when there is no sheet on the sheet feed tray. A push latch mechanism is arranged on a downstream side with respect to the sheet feed roller in the sheet feed direction. A state of the push latch mechanism is alternately switched between an engaged state and a disengaged state every time when a pressing force is applied to the push latch mechanism. A first spring is configured to exert an elastic force to move the sheet feed tray toward a near side.

Abstract: A sheet supply device detachably attachable to an image forming apparatus includes: a main body; a sheet supply roller; an external output gear; a clutch mechanism; and first and second transmission mechanisms. The main body is provided with a sheet supply tray on which a sheet is mountable. The sheet supply roller is in contact with a sheet mounted on the sheet supply tray and configured to rotate to supply the sheet toward the image forming apparatus. The external output gear is configured to output a driving force to an outside. The clutch mechanism is configured to transmit and interrupt a driving force from the image forming apparatus. The first transmission mechanism is configured to transmit the driving force received through the clutch mechanism to the sheet supply roller. The second transmission mechanism is configured to transmit the driving force received through the clutch mechanism to the external output gear.

Abstract: An image forming apparatus includes a photosensitive drum, a light exposure device, a developing device, a fixing unit disposed opposite to the light exposure device relative to the developing device, a sheet supply tray disposed below the developing device, an ejection tray disposed above the developing device and having a sheet receiving surface inclined downward, relative to a horizontal direction, toward the charger, and a sheet conveying path through which a sheet is conveyed from the sheet supply tray to the ejection tray. A lowest end portion of the sheet receiving surface is disposed below an upper end of the charger in the vertical direction. The charger is disposed opposite to the developing device relative to the lowest end portion of the sheet receiving surface.

Abstract: An image forming apparatus includes a photosensitive drum, a light exposure device, a developing device, a fixing unit disposed opposite to the light exposure device relative to the developing device, a sheet supply tray disposed below the developing device, an ejection tray disposed above the developing device and having a sheet receiving surface inclined downward, relative to a horizontal direction, toward the charger, and a sheet conveying path through which a sheet is conveyed from the sheet supply tray to the ejection tray. A lowest end portion of the sheet receiving surface is disposed below an upper end of the charger in the vertical direction. The charger is disposed opposite to the developing device relative to the lowest end portion of the sheet receiving surface.

Abstract: An image forming apparatus includes a photosensitive drum, a light exposure device, a developing device, a fixing unit disposed opposite to the light exposure device relative to the developing device, a sheet supply tray disposed below the developing device, an ejection tray disposed above the developing device and having a sheet receiving surface inclined downward, relative to a horizontal direction, toward the charger, and a sheet conveying path through which a sheet is conveyed from the sheet supply tray to the ejection tray. A lowest end portion of the sheet receiving surface is disposed below an upper end of the charger in the vertical direction. The charger is disposed opposite to the developing device relative to the lowest end portion of the sheet receiving surface.

Abstract: A sheet supply device detachably attachable to an image forming apparatus includes: a main body; a sheet supply roller; an external output gear; a clutch mechanism; and first and second transmission mechanisms. The main body is provided with a sheet supply tray on which a sheet is mountable. The sheet supply roller is in contact with a sheet mounted on the sheet supply tray and configured to rotate to supply the sheet toward the image forming apparatus. The external output gear is configured to output a driving force to an outside. The clutch mechanism is configured to transmit and interrupt a driving force from the image forming apparatus. The first transmission mechanism is configured to transmit the driving force received through the clutch mechanism to the sheet supply roller. The second transmission mechanism is configured to transmit the driving force received through the clutch mechanism to the external output gear.

Abstract: An electrophotographic image forming apparatus has a controller configured to store a rotation amount of a motor since the tray is attached to a main body of the image forming apparatus as a stored rotation amount, and move, in response to receipt of a print instruction, a pressing plate by driving the motor in the first mode when a remaining rotation amount is equal to or larger than a particular threshold rotation amount, the remaining rotation amount being a difference between a target rotation amount which is a rotation amount necessary to move the pressing plate from a position when the tray is attached to the main body to the conveying position, and the stored rotation amount, or in the second mode when the remaining rotation amount is less than the particular threshold rotation amount.

Abstract: A sheet feeding device having sheet feed tray configured to support multiple sheets be movably inserted to a main body. A sheet feed roller is configured to contact the sheet supported by the sheet feed tray and rotate to apply a feeding force to feed the sheet in a sheet feed direction. The sheet feed roller is configured to contact the sheet feed tray when there is no sheet on the sheet feed tray. A push latch mechanism is arranged on a downstream side with respect to the sheet feed roller in the sheet feed direction. A state of the push latch mechanism is alternately switched between an engaged state and a disengaged state every time when a pressing force is applied to the push latch mechanism. A first spring is configured to exert an elastic force to move the sheet feed tray toward a near side.

Abstract: An image forming apparatus includes a photosensitive drum, a light exposure device, a developing device, a fixing unit disposed opposite to the light exposure device relative to the developing device, a sheet supply tray disposed below the developing device, an ejection tray disposed above the developing device and having a sheet receiving surface inclined downward, relative to a horizontal direction, toward the charger, and a sheet conveying path through which a sheet is conveyed from the sheet supply tray to the ejection tray. A lowest end portion of the sheet receiving surface is disposed below an upper end of the charger in the vertical direction. The charger is disposed opposite to the developing device relative to the lowest end portion of the sheet receiving surface.

Abstract: An image forming apparatus includes a photosensitive drum, a light exposure device, a developing device, a fixing unit disposed opposite to the light exposure device relative to the developing device, a sheet supply tray disposed below the developing device, an ejection tray disposed above the developing device and having a sheet receiving surface inclined downward, relative to a horizontal direction, toward the charger, and a sheet conveying path through which a sheet is conveyed from the sheet supply tray to the ejection tray. A lowest end portion of the sheet receiving surface is disposed below an upper end of the charger in the vertical direction. The charger is disposed opposite to the developing device relative to the lowest end portion of the sheet receiving surface.

Abstract: An image forming apparatus including a fan cover including a wall portion disposed to overlap a rotational axis of a fan in an axis direction along the rotational axis, the wall portion extending in an orthogonal direction perpendicular to the axis direction, a first section disposed on one side relative to the wall portion in the orthogonal direction, the first section having a first opening disposed on one side relative to the fan in the axis direction and on the one side relative to the rotational axis in the orthogonal direction, and a second section disposed on an other side relative to the wall portion in the orthogonal direction, the second section having a second opening disposed on the one side relative to the fan in the axis direction and on the other side relative to the rotational axis in the orthogonal direction.

Abstract: An image forming apparatus includes an image forming unit, a pair of frames, a connecting member, a supply board, and a control board. The image forming unit includes a photosensitive body configured to carry developer and an exposure unit configured to scan and expose the photosensitive body to light. The pair of frames is disposed in a horizontal direction opposite to each other with the image forming unit being positioned therebetween. The connecting member extends in the horizontal direction and supports the exposure unit. The connecting member has each longitudinal end portion connected to each of the pair of frames. The supply board is configured to supply electric power to an electric motor. The control board is configured to control operation of the image forming unit. At least one of the control board and the supply board is supported to the connecting member.

Abstract: Image forming apparatus includes: image forming unit for forming an image on a sheet, and controller for controlling the image forming unit. The controller includes process modules to carry out: counting process for performing counting in accordance with the number of sheets printed by the image forming unit; first bias applying process for setting a developing bias to be applied to the developer carrier to a first bias if a count value in the counting process has not reached a predetermined threshold value; bias changing process for changing the developing bias to a second bias whose absolute value is smaller than that of the first bias if the count value has reached the threshold value; and delaying process for causing an execution timing of the bias changing process to be delayed if the number of sheets printed in a unit of time is not smaller than a reference number.

Abstract: An image forming apparatus includes a photosensitive drum, a light exposure device, a developing device, a fixing unit disposed opposite to the light exposure device relative to the developing device, a sheet supply tray disposed below the developing device, an ejection tray disposed above the developing device and having a sheet receiving surface inclined downward, relative to a horizontal direction, toward the charger, and a sheet conveying path through which a sheet is conveyed from the sheet supply tray to the ejection tray. A lowest end portion of the sheet receiving surface is disposed below an upper end of the charger in the vertical direction. The charger is disposed opposite to the developing device relative to the lowest end portion of the sheet receiving surface.

Abstract: Image forming apparatus includes: image forming unit for forming an image on a sheet, and controller for controlling the image forming unit. The controller includes process modules to carry out: counting process for performing counting in accordance with the number of sheets printed by the image forming unit; first bias applying process for setting a developing bias to be applied to the developer carrier to a first bias if a count value in the counting process has not reached a predetermined threshold value; bias changing process for changing the developing bias to a second bias whose absolute value is smaller than that of the first bias if the count value has reached the threshold value; and delaying process for causing an execution timing of the bias changing process to be delayed if the number of sheets printed in a unit of time is not smaller than a reference number.

Abstract: An image forming apparatus includes an image forming unit, a pair of frames, a connecting member, a supply board, and a control board. The image forming unit includes a photosensitive body configured to carry developer and an exposure unit configured to scan and expose the photosensitive body to light. The pair of frames is disposed in a horizontal direction opposite to each other with the image forming unit being positioned therebetween. The connecting member extends in the horizontal direction and supports the exposure unit. The connecting member has each longitudinal end portion connected to each of the pair of frames. The supply board is configured to supply electric power to an electric motor. The control board is configured to control operation of the image forming unit. At least one of the control board and the supply board is supported to the connecting member.

Abstract: An image forming apparatus includes a main body, sheet discharge unit, fixing unit, and conveying guide. The fixing unit thermally fixes a developer image deposited on a sheet to provide an image-fixed sheet. The conveying guide defines at least a part of a conveying path. The conveying guide guides one surface of the image-fixed sheet. The conveying guide includes a fixed guide unit and movable guide unit. The fixed guide unit guides end portions of the image-fixed sheet in a widthwise direction orthogonal to a conveying direction of the image-fixed sheet. The fixed guide unit is immovable relative to the main body. The movable guide unit is disposed adjacent to the fixed guide unit in the widthwise direction and movable relative to the fixed guide unit. The movable guide unit guides the image-fixed sheet in a first position. The movable guide unit exposes the conveying path in a second position.

Abstract: An image forming apparatus includes: a main body casing; a fixing unit accommodated in the casing and including a heating member and a pressing member; a first wall provided inside the casing at a position above the heating member and the pressing member and extending diagonally downward and forward; an uneven portion provided on the first wall at a position rearward of front end portion of the pressing member to restrain a dew droplet condensed on the first wall from running down along the first wall; a sheet ejection opening formed in the casing such that the recording sheet conveyed out from the fixing unit is ejected outside the casing through the sheet ejection opening; and an exhaust opening formed in the casing at a position rearward of the heating member such that air heated in the fixing unit is discharged outside the casing through the exhaust opening.

Abstract: An image forming apparatus including a fan cover including a wall portion disposed to overlap a rotational axis of a fan in an axis direction along the rotational axis, the wall portion extending in an orthogonal direction perpendicular to the axis direction, a first section disposed on one side relative to the wall portion in the orthogonal direction, the first section having a first opening disposed on one side relative to the fan in the axis direction and on the one side relative to the rotational axis in the orthogonal direction, and a second section disposed on an other side relative to the wall portion in the orthogonal direction, the second section having a second opening disposed on the one side relative to the fan in the axis direction and on the other side relative to the rotational axis in the orthogonal direction.