Abstract: A photosensitive drum is rotatable about a drum axis extending in a first direction. A frame includes a first side plate located at first end in the first direction and a second side plate spaced from the first side plate in the first direction. The frame rotatably supports the photosensitive drum between the first side plate and the second side plate in the first direction. The frame holds a developer cartridge. A lock lever is pivotable about a pivot axis extending in a second direction intersecting with the first direction. The lock lever is movable between a lock position at which the developer cartridge is locked on the frame and a release position at which the developer cartridge is unlocked from the frame.

Abstract: A method for manufacturing a gear and a gear for a transmission, in which an outer peripheral gear part formed on an outer peripheral wall surface of a main body of a gear, an annularly-shaped concave portion annularly formed at a radial inner part on at least one axial end surface of the main body of the gear within the outer peripheral gear part thereof, a dog gear part formed on an outside peripheral wall surface at a central part formed on the annularly-shaped concave portion, and a taper part comprising an inner corn for being synchro formed on an inside peripheral wall surface formed on the annularly-shaped concave portion, are formed integrally by forging.

Abstract: A speed change gear with dog clutch pawls projected on a side surface of a gear body having a speed change gear part on an outer peripheral surface thereof, and a method and a device of manufacturing the same, in which the dog clutch pawls are provided with back tapers on at least engaging surface thereof, and the dog clutch pawls with back tapers and the change gear part are integrally molded by forging.

Abstract: A method for manufacturing a gear, wherein the gear is formed on a forging process by a die having an inner peripheral surface. A plurality of top surfaces corresponding to a bottom surface of the gear and both projected side surfaces corresponding to tooth surfaces of the gear and sandwiching the top surface connect smoothly to each other. The tooth surfaces and the bottom surface of the formed gear connect to each other smoothly. The forging process is carried out as a hot forging process in which the gear is formed by a hot forging die, or the forging process is carried out as a cold forging process in which the gear is formed by a cold forging die.

Abstract: In a gear product, a plurality of tooth having a crowning formed in a pattern unified to one pattern selected from fourteen patterns comprising four patterns in which a crowning is formed at one of an upper end part A or lower end part B of an upper inclined surface 91, an upper end part C or a lower end part D of a lower inclined surface 92, six patterns in which crownings are formed at two parts thereof and four patterns in which crownings are formed with three parts thereof, are formed at an equal pitch on an outer peripheral surface of a gear part. In a helical gear 9, a combination pattern of an upper part A of an upper side tooth surface 91 and a lower part D of a lower tooth surface 92 or a pair of an upper part C of the lower tooth surface 92 and a lower part D of the upper tooth surface 92 is formed by forging device.

Abstract: A speed change gear with dog clutch pawls projected on a side surface of a gear body having a speed change gear part on an outer peripheral surface thereof, and a method and a device of manufacturing the same, in which the dog clutch pawls are provided with back tapers on at least engaging surface thereof, and the dog clutch pawls with back tapers and the change gear part are integrally molded by forging.

Abstract: A method for manufacturing a gear, wherein the gear is formed on a forging process by a die having an inner peripheral surface, on which a plurality of top surface corresponding to a bottom surface of the gear and both projected side surfaces corresponding to tooth surfaces thereof and sandwiching the top surface connect smoothly each other, in which the tooth surfaces and the bottom surface of the formed gear connect to each other smoothly, wherein the forging process is carried out on hot forging process in which the gear is formed by a hot forging die having an inner peripheral surface including a plurality of the top surface corresponding to a bottom surface of the gear and both projected side surfaces corresponding to the tooth surfaces thereof and sandwiching the top surface, and wherein the forging process is carried out on cold forging process in which the gear is formed by a cold forging die having an inner peripheral surface including a plurality of a top surface corresponding to the bottom surface

Abstract: A clutch gear having a boss part with a spline which is formed on an outer peripheral surface of the boss part formed on an axial end surface of the clutch gear having jaw clutch teeth formed on an outer peripheral surface thereof, in which the boss part, with the spline formed on outer peripheral surface thereof, is formed integrally and coaxially with the clutch gear having the jaw clutch teeth formed on the outer peripheral surface thereof by forging, the diameter of the boss part is shorter than that of the clutch gear, and an end part of an effective portion of the spline comes to at least an end surface of the clutch gear.

Abstract: A transmission gear with a dog clutch gear in which the dog clutch gear has clutch teeth formed on an outer circumferential surface of a ring part and tapered inversely so that the tooth thickness of each tooth decreases gradually from a chamfer portion at a tip end toward a base end portion thereof, and the dog clutch gear is integrally fitted onto a boss portion of the transmission gear which portion is coaxially and integrally formed on a side surface of the transmission gear, characterized in that a flange is provided on the ring part to be located on the side corresponding to the base end portion of the clutch teeth, and plurality of surfaces between the ring part and the transmission gear is performed by welding.

Abstract: A method for manufacturing a gear and a gear for a transmission, in which an outer peripheral gear part formed on an outer peripheral wall surface of a main body of a gear, an annularly-shaped concave portion annularly formed at a radial inner part on at least one axial end surface of the main body of the gear within the outer peripheral gear part thereof, a dog gear part formed on an outside peripheral wall surface at a central part formed on the annularly-shaped concave portion, and a taper part comprising an inner corn for synchro formed on an inside peripheral wall surface formed on the annularly-shaped concave portion, are formed integrally by forging.

Abstract: A transmission gear with a dog clutch gear in which the dog clutch gear has clutch teeth formed on an outer circumferential surface of a ring part and tapered inversely so that the tooth thickness of each tooth decreases gradually from a chamfer portion at a tip end toward a base end portion thereof, and the dog clutch gear is integrally fitted onto a boss portion of the transmission gear which portion is coaxially and integrally formed on a side surface of the transmission gear, characterized in that a flange is provided on the ring part to be located on the side corresponding to the base end portion of the clutch teeth, and plurality of surfaces between the ring part and the transmission gear is performed by welding.

Abstract: A clutch gear having a boss part with a spline which is formed on an outer peripheral surface of the boss part formed on an axial end surface of the clutch gear having jaw clutch teeth formed on an outer peripheral surface thereof, in which the boss part, with the spline formed on outer peripheral surface thereof, is formed integrally and coaxially with the clutch gear having the jaw clutch teeth formed on the outer peripheral surface thereof by forging, the diameter of the boss part is shorter than that of the clutch gear, and an end part of an effective portion of the spline comes to at least an end surface of the clutch gear.