An image forming apparatus of the present disclosure includes a developing device, a support frame, a developer supply mechanism, and a shutter member. The developing device has a developer bearing member that supplies a developer to the image bearing member. The support frame is capable of disposin
An image forming apparatus of the present disclosure includes a developing device, a support frame, a developer supply mechanism, and a shutter member. The developing device has a developer bearing member that supplies a developer to the image bearing member. The support frame is capable of disposing the developing device selectively at a mounting/demounting position and at a developing position. The shutter member opens a replenishment port formed at the connection portion in tandem with the movement of the developing device from the mounting/demounting position to the developing position and closes the replenishment port in tandem with the movement of the developing device from the developing position to the mounting/demounting position. A direction in which the developing device is moved is different from a direction in which the shutter member performs the opening/closing of the replenishment port.
대표청구항▼
1. An image forming apparatus, comprising: a developing device having a developer bearing member that is disposed so as to be opposed to an image bearing member on which an electrostatic latent image is formed and, at a region thereof opposed to the image bearing member, supplies a developer to the
1. An image forming apparatus, comprising: a developing device having a developer bearing member that is disposed so as to be opposed to an image bearing member on which an electrostatic latent image is formed and, at a region thereof opposed to the image bearing member, supplies a developer to the image bearing member;a support frame that supports the developing device and is capable of disposing the developing device selectively at a mounting/demounting position where the developer bearing member is separated from the image bearing member and at a developing position where a developer can be supplied to the image bearing member;a developer supply mechanism that supplies a developer to the developing device;and a shutter member that is fitted around a connection portion of the developer supply mechanism at which the developer supply mechanism is connected to the developing device, and opens a replenishment port formed at the connection portion in tandem with movement of the developing device from the mounting/demounting position to the developing position and closes the replenishment port in tandem with movement of the developing device from the developing position to the mounting/demounting position, where a direction in which the developing device is moved, is different from a direction in which the: shutter member performs the opening/closing of the replenishment port, whereinthe shutter member is a cylindrical member into which the connection portion is rotatably inserted and that has an opening portion formed on an outer peripheral surface thereof at a position that is to coincide with a position of the replenishment port,the developing device has a guide portion that has a substantially oval section and into which the shutter member is inserted, andthe developing device is moved to and fro between the mounting/demounting position and the developing position, so that the shutter member is relatively and horizontally moved while rotating within the guide portion, and thus opens/closes the replenishment port. 2. The image forming apparatus according to claim 1, wherein the shutter member has, on an outer side of a tip end portion thereof in an insertion direction thereof, a rib-shaped protrusion that extends in a radial direction from a center axis thereof and is provided in a protruding manner, and the guide portion has, on an inner wall surface thereof at a back in the insertion direction of the shutter member, a substantially L-shaped guide groove with which the protrusion is to be engaged, andthe shutter member rotates such that it is relatively and horizontally moved within the guide portion, with the protrusion being engaged with the guide groove. 3. The image forming apparatus according to claim 2, wherein when in a state of not being inserted into the guide portion, the shutter member is kept, by a biasing member, in such a posture that the protrusion is engageable with the guide groove. 4. The image forming apparatus according to claim 2, wherein the shutter member has, at part of an outer peripheral edge of a rear end portion thereof in the insertion direction, a flange portion that is provided in a protruding manner, and the guide portion has, at a lower portion of an opening edge thereof in front with respect to the insertion direction of the shutter member, a level difference portion with which, the flange portion is to be engaged, andthe shutter member rotates such that, when it is relatively and horizontally moved within the guide portion, the flange portion rides up on the level difference portion. 5. The image forming apparatus according to claim 1, wherein the shutter member has a lug portion that rotatably engages the shutter member with the connection portion and prevents the shutter member from coming off from the connection portion. 6. The image forming apparatus according to claim 1, wherein the developer supply mechanism is disposed at a position where it does not positionally coincide with a direction in which the developing device is mounted/demounted.
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이 특허에 인용된 특허 (9)
Kojima, Hisayoshi; Isobe, Hironobu; Matsuda, Kenji; Yahagi, Takashi, Cartridge having developer supply opening and image forming apparatus usable therewith.
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