JP5743360B2 - Image forming apparatus and removable developer container mounted thereon - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a copying machine, a facsimile machine, a printer, and the like, and a detachable developer container mounted on the image forming apparatus, and in particular, a developer container that replenishes the developer by rotating the container body. The present invention relates to an opening / closing mechanism for the developer discharge port.

  2. Description of the Related Art Conventionally, a developing device mounted on an image forming apparatus is filled with a certain amount of developer (toner) in the developing device for easy maintenance, and is replaced when the developer is exhausted. However, the developing device cannot be replaced frequently from an economic point of view, and the capacity of the developer must be increased in order to form a certain number of images. . Therefore, in order to reduce the size of the developing device, the developer is supplied using a developer container such as a toner container or a toner cartridge provided separately from the developing device, or a developer supply mechanism such as an intermediate hopper. A type of developing device has been proposed.

  The developer is supplied to the developing device by supplying the developer directly from the developer containing container containing the developer to the developing device, or by connecting the developer containing container to the developer supplying mechanism. A developer in which a developer in a developer container is agitated and conveyed by a developer supply mechanism and supplied from a predetermined position to a developing device is known. Further, as disclosed in Patent Document 1, a technique for conveying a developer to a desired position by rotating the developer container itself without using a stirring and conveying member has been proposed.

  According to the method of rotating the developer container itself, it is not necessary to provide an agitating and conveying member inside the developer container, so that the amount of developer that can be accommodated in the developer container can be increased, and the developer container There is an advantage that the cost can be reduced. Further, since the rotation load of the agitating / conveying member is not applied when the developer is conveyed, deterioration of the developer due to mechanical stress can be suppressed.

  However, in the method of rotating the developer container itself as described above, the developer may leak from the developer discharge port formed in the developer container when the developer container is attached or detached, and the leaked development There has been a problem of adversely affecting workability and maintainability, such as contamination of the worker and the inside of the image forming apparatus by the agent.

  In view of this, there has been proposed a developer container that can easily handle the developer container filled with the developer without causing the developer to leak and can be easily replaced. For example, Patent Document 2 discloses that a toner container holding member having an inner wall portion that abuts a toner discharge port of a toner container at a predetermined position and closes the toner discharge port is connected to the toner container main body by a feed screw mechanism. A toner container provided to be movable along the direction of the rotation axis of the main body is disclosed.

  The toner container rotates the toner container main body with respect to the toner container holding member in a direction opposite to the rotation direction in which the toner is discharged from the toner container, so that the toner container and the inner wall of the toner container holding member are in contact with each other. The toner discharge port is closed, and the toner container main body is rotated relative to the toner container holding member in a rotation direction for discharging the toner from the toner storage portion. And the toner discharge port is opened.

JP-A-8-339115 JP 2008-225072 A

  However, in the configuration of Patent Document 2, there is no particular problem as long as the toner in the toner container main body is completely empty when the toner container is removed, but the toner container remains in a state where the toner remains in the toner container main body. When removing the toner container, if the toner container main body is reversely rotated to close the toner discharge port, the toner may be caught between the toner container and the toner container holding member. As a result, the feed screw mechanism for moving the toner container holding member relative to the toner container main body does not operate smoothly, and toner leakage may occur if the toner container is removed without completely closing the toner discharge port. .

  In view of the above problems, the present invention is capable of opening and closing the developer discharge port in conjunction with the attaching and detaching operation of the developer container for replenishing the developer by rotating the container body and the developer replenishing operation. An object of the present invention is to provide an image forming apparatus that does not cause leakage of developer when the container is attached and detached, and a detachable developer container that is mounted on the image forming apparatus.

  In order to achieve the above object, the present invention is an image forming apparatus including a developer container, a developer supply mechanism, and a drive mechanism. The developer container is detachable from the image forming apparatus main body. The developer container is formed in a cylindrical container main body that stores the developer and one end of the container main body, and the developer discharge container that discharges the developer in the container main body. The outlet, the engaging projection formed on the outer peripheral surface of the other end of the container body, and the container body can be rotated within a predetermined angle range, and the rotation with respect to the container body is regulated at both ends of the predetermined angle. And a shutter having an opening formed in a part of the surface facing the developer discharge port. The developer container discharges the developer from the developer discharge port by rotating the container body in the circumferential direction. The developer supply mechanism rotatably supports the developer container and supplies the developer discharged from the developer discharge port to the developing device. The drive mechanism has a ring-shaped coupling that engages with the engaging protrusion, and rotates the developer container in the developer supply direction by rotationally driving the coupling. The developer supply mechanism is provided with a torque limiter that engages with the shutter when the developer container is mounted. When the developer container is rotated in the developer supply direction, the container main body is rotated by a predetermined angle while the shutter is stationary by the torque limiter, the developer discharge port is opened, and the developer container is continuously rotated, thereby the shutter. With the developer discharge port opened, the developer rotates integrally with the container body to supply the developer from the developer discharge port. When the developer container is rotated in the direction opposite to the developer supply direction, the container main body rotates reversely by a predetermined angle while the shutter is stationary by the torque limiter, and the developer discharge port is closed.

  According to the present invention, in the image forming apparatus configured as described above, the developer supply mechanism is disposed on one end side of the container main body where the developer discharge port is formed, and the drive mechanism includes the engagement convex portion. It is arrange | positioned at the other end part side of the said container main body in which is formed.

  According to the present invention, in the image forming apparatus configured as described above, the driving mechanism can rotationally drive the developer container in a direction opposite to the developer supply direction, and the developer container can be moved in the developer supply direction. The developer discharge port is opened along with the rotating developer supply operation, and when the developer supply operation is stopped, the developer storage container is rotated by a predetermined angle in the direction opposite to the developer supply direction. It is characterized by closing the outlet.

  According to the present invention, in the image forming apparatus having the above-described configuration, the developer container and the drive mechanism are engaged and fixed by manually rotating the developer container in a developer supply direction by a predetermined angle, and the development is performed. The developer discharge port is opened, and the developer container is manually rotated by a predetermined angle in the direction opposite to the developer supply direction to release the engaged state between the developer container and the drive mechanism, and the developer. It is characterized by closing the outlet.

  The present invention also includes a cylindrical container body that is detachably mounted on the image forming apparatus having the above-described configuration, and that is formed at one end of the container body and discharges the developer in the container body. An agent discharge port, an engaging convex portion formed on the outer peripheral surface of the other end portion of the container main body and engaged with a coupling on the image forming apparatus main body side, and rotatable in a range of a predetermined angle with respect to the container main body. And a shutter that is mounted and has an opening formed in a part of a surface facing the developer discharge port, and discharges the developer from the developer discharge port by rotating the container body in the circumferential direction. It is a drug container.

  According to the first configuration of the present invention, since the developer discharge port is reliably closed by the shutter when the developer container is attached or detached, the inside and outside of the image forming apparatus due to the leakage of the developer from the developer discharge port. Contamination can be effectively prevented. In addition, since the developer container is rotated by rotating the coupling that engages with the engaging projection formed on the container body, the developer discharge port is opened and closed by the shutter. No special operation for opening and closing is required, and the workability for replacing the developer container is improved. In addition, since a mechanism for opening and closing the shutter is not required on the developer container side, the developer container as a replacement part has an inexpensive and simple configuration, and the maintenance cost can be reduced.

1 is a schematic cross-sectional view of an image forming apparatus 100 according to an embodiment of the present invention. Side sectional view of the developing device 4 mounted in the image forming apparatus 100 of the present invention. 1 is an external perspective view showing the positional relationship among the developing device 4, the toner container 5, and the intermediate hopper 6 in the image forming apparatus 100 of FIG. FIG. 1 is an external perspective view showing the positional relationship among the developing device 4, the toner container 5, and the intermediate hopper 6 in the image forming apparatus 100 as viewed from the back side of FIG. FIG. 4 is an external perspective view showing a state in which the toner container 5 is removed from the state of FIG. The perspective view which shows the state which the support frame 41 and the frame fixing member 50 arrange | positioned at the image forming apparatus 100 main body side connected. A perspective view of the support frame 41 and the development release lever 44 as viewed from below. FIG. 7 is a partially enlarged view around one nail portion 46. A perspective view of the frame fixing member 50 as viewed from above 1 is an exploded perspective view of a toner container 5 according to the first embodiment of the present invention. An enlarged view of one end side (cap 56a side) of the toner container 5 of FIG. 10 viewed from the back side. FIG. 6 is a perspective view of the toner container 5 mounted on the hopper upper part 6a as viewed from the inside of the hopper upper part 6a, and shows a state in which the toner discharge port 57 is closed. FIG. 6 is a perspective view of the toner container 5 mounted on the hopper upper part 6a as viewed from the inside of the hopper upper part 6a, and shows a state in which the toner discharge port 57 is opened. FIG. 4 is a partially enlarged view of a state in the middle of inserting the toner container 5 according to the second embodiment of the present invention into the image forming apparatus 100 as viewed from the front side of the image forming apparatus 100. The partial enlarged view which looked at the state which inserted the toner container 5 of 2nd Embodiment in the image forming apparatus 100 from the front side of the image forming apparatus 100 A partially enlarged view of the state in which the toner container 5 of the second embodiment is rotated to lock the toner container 5 and the coupling 33 as viewed from the front side of the image forming apparatus 100.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an image forming apparatus 100 according to an embodiment of the present invention. In the main body of the image forming apparatus (for example, a monochrome multifunction peripheral) 100, an image forming portion P for forming a monochrome image by each process of charging, exposure, development, and transfer is disposed.

  In the image forming unit P, along the rotation direction of the photosensitive drum 1 (counterclockwise direction in FIG. 1), the charging unit 2, the exposure unit 3, the developing device 4, the transfer roller 7, the cleaning device 8, and the static eliminating device. (Not shown) is provided. In the image forming unit P, the image forming process for the photosensitive drum 1 is executed while rotating the photosensitive drum 1 in the counterclockwise direction in FIG.

  The photosensitive drum 1 is formed, for example, by laminating a photosensitive layer on an aluminum drum, and the charging unit 2 charges the surface. Then, an electrostatic latent image in which charging is attenuated is formed on the surface that has received a laser beam from the exposure unit 3 described later. The above-mentioned photosensitive layer is not particularly limited. For example, amorphous silicon (a-Si) having excellent durability, or an organic photosensitive layer (high-resolution image can be obtained with little generation of ozone during charging). OPC) and the like are preferable.

  The charging unit 2 uniformly charges the surface of the photosensitive drum 1. For example, a corona discharge device that discharges by applying a high voltage using a thin wire or the like as an electrode is used as the charging unit 2. Instead of the corona discharge device, a contact-type charging device that applies a voltage in a state where a charging member typified by a charging roller is in contact with the surface of the photoreceptor may be used. The exposure unit 3 irradiates the photosensitive drum 1 with a light beam (for example, a laser beam) based on the document image data read by the image reading unit 18 to form an electrostatic latent image on the surface of the photosensitive drum 1.

  The developing device 4 forms toner images by attaching toner to the electrostatic latent image on the photosensitive drum 1. The toner is supplied to the developing device 4 from the toner container 5 via the intermediate hopper 6. Here, a single-component developer (hereinafter also simply referred to as toner) composed only of magnetic toner components is accommodated in the developing device 4. Details of the developing device 4, the toner container 5, and the intermediate hopper 6 will be described later.

  The transfer roller 7 transfers the toner image formed on the surface of the photosensitive drum 1 to the sheet conveyed through the sheet conveyance path 11 without disturbing the toner image. The cleaning device 8 includes a cleaning roller, a cleaning blade, and the like that are in linear contact with the longitudinal direction of the photosensitive drum 1, and removes residual toner remaining on the surface of the photosensitive drum 1 after the toner image is transferred to the paper. To do.

  The image reading unit 18 includes a scanner lamp that illuminates the document during copying, a scanning optical system equipped with a mirror that changes the optical path of reflected light from the document, and a condensing lens that focuses the reflected light from the document to form an image. And a CCD sensor or the like (both not shown) that converts the imaged image light into an electrical signal, and reads a document image and converts it into image data.

  When performing a copy operation, the image reading unit 18 reads the image data of the document and converts it into an image signal. On the other hand, in the image forming unit P, the photosensitive drum 1 that rotates counterclockwise in the drawing is uniformly charged by the charging unit 2, and the exposure unit 3 is based on the document image data read by the image reading unit 18. Emits a laser beam (light beam) onto the photosensitive drum 1 to form an electrostatic latent image based on the image data on the surface of the photosensitive drum 1. Thereafter, the developing device 4 attaches toner to the electrostatic latent image to form a toner image.

  A sheet is conveyed from the sheet storage unit 10 through the sheet conveyance path 11 and the registration roller pair 13 at a predetermined timing toward the image forming unit P on which the toner image is formed as described above. The toner image on the surface of the photosensitive drum 1 is transferred onto the sheet by the transfer roller 7. The sheet on which the toner image has been transferred is separated from the photosensitive drum 1, conveyed to the fixing unit 9, and heated and pressed to fix the toner image on the sheet.

  The paper that has passed through the fixing unit 9 is sorted in the transport direction by the transport guide member 16 disposed in the branching section of the paper transport path 11, and is sent as it is (or after being sent to the reverse transport path 17 and copied on both sides). The paper is discharged to the paper discharge unit 15 via the discharge roller pair 14.

  FIG. 2 is a side sectional view of the developing device 4. As shown in FIG. 2, a first storage chamber 21 and a second storage chamber 22 are formed in the developing container 20 by a partition wall (not shown) formed integrally with the developing container 20. A first stirring screw 23 is disposed in the first storage chamber 21, and a second stirring screw 24 is disposed in the second storage chamber 22. A toner supply port 20a is provided in an upper portion of the developing container 20, and is stored in the toner container 5 (see FIG. 1) according to a detection result of a toner sensor (not shown) that detects the amount of toner in the developing container 20. The toner thus supplied is supplied through the intermediate hopper 6 (see FIG. 1). In addition, a guide portion 26 to which a toner conveyance path 70 (see FIG. 4), which will be described later, is connected is provided so as to surround the toner supply port 20a.

  Each of the first stirring screw 23 and the second stirring screw 24 has a structure in which a spiral blade is provided around the support shaft, and is rotatably supported by the developing container 20 in a state of being parallel to each other. Yes. Note that there are no partition walls at both ends of the longitudinal direction of the developing container 20 (the direction perpendicular to the paper surface of FIG. 2), which is the axial direction of the first stirring screw 23 and the second stirring screw 24, and the first stirring screw. 23, the toner can be transferred between the second stirring screws 24. Thus, the first stirring screw 23 conveys the toner in the first storage chamber 21 to the second storage chamber 22 while stirring, and the second stirring screw 24 transfers the toner transferred to the second storage chamber 22. It is conveyed while stirring and supplied to the developing roller 25.

  The developing roller 25 is rotatably supported by the developing container 20 in a state parallel to the first stirring screw 23 and the second stirring screw 24. A magnet body 27 made of a permanent magnet having a plurality of magnetic poles is fixed inside the developing roller 25. A toner thin layer is formed by attaching (carrying) toner onto the surface of the developing roller 25 by the magnetic force of the magnet body 27. A part of the outer peripheral surface of the developing roller 25 is exposed from the developing container 20, and the exposed part is disposed so as to face the photosensitive drum 1 (see FIG. 1).

  Then, the developing roller 25 on which the toner thin layer is formed rotates according to the rotation of the photosensitive drum 1 to supply toner to the photosensitive layer of the photosensitive drum 1. The first stirring screw 23, the second stirring screw 24, and the developing roller 25 are rotationally driven at a predetermined speed by a motor (not shown) and a gear train. Further, magnetic seal members 28 for preventing leakage of toner from the gap between the developing container 20 and the developing roller 25 are disposed at both ends of the developing roller 25.

  The regulating blade 29 is formed such that its longitudinal direction is larger than the maximum developing width of the developing roller 25, and is arranged at a predetermined interval from the developing roller 25, so that the amount of toner supplied to the photosensitive drum 1 can be reduced. A layer thickness regulating portion 30 to be regulated is formed. The gap of the layer thickness regulating portion 30 is set to about 0.2 mm to 0.4 mm. As the material of the regulating blade 29, magnetic or non-magnetic SUS (stainless steel) or the like is used. Here, a permanent magnet 31 is attached to a magnetic regulating blade 29 to provide magnetism.

  The magnet body 27 has a plurality of magnetic poles (not shown) composed of N poles and S poles. Since the magnetic poles of the magnet body 27 are parallel to the regulating blade 29, the poles are concentrated on the tip of the regulating blade 29, and a magnetic field in a direction attracting the layer thickness regulating portion 30 is generated.

  By this magnetic field, a toner chain (magnetic brush) in which toner is continuous is formed between the regulating blade 29 and the developing roller 25. Then, the layer is regulated by passing through the layer thickness regulating unit 30, and a thin toner layer is formed on the developing roller 25. By arranging the permanent magnet 31 on the regulating blade 29, the regulating force is increased by the magnetic field generated in the layer thickness regulating section 30 as well as the interval between the layer thickness regulating sections 30, and a thin toner layer of several tens of μm is formed on the developing roller 25. Form. On the other hand, the toner that has not been used for forming the toner thin layer stays along the upstream side surface (lower side in FIG. 2) of the regulating blade 29. Thereafter, when the developing roller 25 rotates in the clockwise direction in FIG. 2 and the toner chain moves to a position facing the photosensitive drum 1, the toner chain forms a toner image with a certain distance from the surface of the photosensitive drum 1. Form.

  3 and 4 are external perspective views showing the positional relationship among the developing device 4, the toner container 5, and the intermediate hopper 6 in the image forming apparatus 100 of FIG. 1, and FIG. 5 is a diagram in which the toner container 5 is removed from the state of FIG. It is an external appearance perspective view which shows a state. 3 shows a state in which the developing device 4, the toner container 5, and the intermediate hopper 6 are viewed from the back side of the image forming apparatus 100 (the back side in FIG. 1).

  The developing device 4 is placed on a support frame 41 that is movable in the horizontal direction (arrow AA ′ direction) with respect to the main body of the image forming apparatus 100 (see FIG. 1). When the support frame 41 moves in the direction of arrow A, the developing device 4 is positioned so that the developing roller 25 faces the photosensitive drum 1 with a predetermined gap and toner can be supplied to the photosensitive drum 1 ( Hereinafter, it is arranged at a developing position). On the other hand, when the support frame 41 moves in the direction of the arrow A ′, the developing device 4 has a position where the developing roller 25 is separated from the photosensitive drum 1 and is detachable from the main body of the image forming apparatus 100 (hereinafter, referred to as an detaching position). Placed in.

  The developing device 4 arranged at the attaching / detaching position is attached to and detached from (attached to) the support frame 41 by being inserted or pulled out along the bottom surface of the support frame 41 in the direction perpendicular to the paper surface of FIG. Further, when the developing device 4 is disposed at the developing position, toner can be supplied from the developing device 4 to the photosensitive drum 1. A moving mechanism of the support frame 41 will be described later.

  The intermediate hopper 6 includes a hopper upper part 6a fixed to the main body of the image forming apparatus 100 and to which the toner container 5 is mounted, and a hopper lower part 6b connected to the hopper upper part 6a. In the hopper upper part 6a, a rotating shaft 61 on which the toner container 5 is rotatably supported and a paddle 63 that rotates around the rotating shaft 61 together with the toner container 5 are disposed. The hopper lower part 6b is connected to the toner supply port 20a of the developing device 4 so that a toner conveying path 70 for conveying the toner protrudes downward, and the inside of the hopper lower part 6b communicates with the inside of the toner conveying path 70. doing. The toner conveyance path 70 is formed of a material having rigidity, and a spiral (not shown) for transferring the toner in the intermediate hopper 6 to the developing device 4 is disposed in the toner conveyance path 70.

  The toner container 5 has four engaging projections 55b protruding from one end of the outer peripheral surface of a cylindrical container body 55, and engages with the engagement projection 55b on the image forming apparatus 100 body side. A ring-shaped coupling 33 and a motor 35 that rotationally drives the coupling 33 are arranged.

  The end of the toner conveying path 70 on the developing device 4 side is slidably inserted into the guide portion 26 of the developing device 4. With this configuration, the guide unit 26 functions as a link member that connects the developing device 4 to the toner conveyance path 70 so as to be horizontally movable. It can be reciprocated (translated) in the direction.

  Next, the moving mechanism of the support frame 41 will be described. 6 is a perspective view showing a state in which the support frame 41 and the frame fixing member 50 arranged on the main body side of the image forming apparatus 100 are connected. FIG. 7 shows the support frame 41 and the development release lever 44 from below. FIG. 8 is a partially enlarged view of the vicinity of one claw portion 46 in FIG. 7 (inside the broken line circle S in FIG. 7), and FIG. 9 is a perspective view of the frame fixing member 50 as viewed from above. In FIG. 6, the development release lever 44 is not shown.

  The development release lever 44 is fixed to one end of a shaft 45 that is rotatably supported below the support frame 41. Two claws 46 are provided in the vicinity of both ends of the shaft 45, and the shaft 45 and the claws 46 are rotated by operating the development release lever 44. On the back side of the support frame 41, a pair of rail portions 41 a, a pair of spring receiving portions 48 that receive one end of the coil spring 47, and a pair of protrusions 49 that are disposed to face the claw portions 46 are formed. Yes.

  The frame fixing member 50 is fixed to the main body side of the image forming apparatus 100, and a rail engagement groove 51 that engages with the rail portion 41 a of the support frame 41 and a spring space 53 that accommodates the coil spring 47 are formed. . That is, both ends of the coil spring 47 are in contact with the spring receiving portion 48 and the inner wall surface at the left end of the spring space 53, and normally, the spring receiving portion 48 of the support frame 41 approaches the frame fixing member 50 (arrow A). Direction) is acting.

  When the development release lever 44 is rotated in the arrow C direction from the state of FIG. 8, the shaft 45 and the claw portion 46 are also rotated in the same direction, and the tip of the claw portion 46 presses the side surface of the protrusion 49. As a result, the support frame 41 moves in the direction of the arrow A ′, and the developing device 4 (see FIG. 4) is disposed at the attachment / detachment position. Further, since the spring receiving portion 48 moves in the direction of the arrow A ′ together with the support frame 41, the coil spring 47 is pressed against the inner wall surface at the left end of the spring space 53 and compressed.

  Next, when the development release lever 44 is rotated in the direction of the arrow C ′ to return to the state shown in FIG. 8, the shaft 45 and the claw portion 46 are also rotated in the same direction. Separate. As a result, the compressed coil spring 47 expands and presses the spring receiving portion 48, so that the support frame 41 moves in the direction of arrow A, and the developing device 4 (see FIG. 4) is disposed at the developing position.

  10 is an exploded perspective view of the toner container 5 according to the first embodiment of the present invention, and FIG. 11 is an enlarged view of one end side (cap 56a side) of the toner container 5 of FIG. 10 viewed from the back side. . The toner container 5 includes a cylindrical container body 55 and caps 56 a and 56 b that are attached to both ends of the container body 55. A spiral conveyance rib 55 a is formed on the inner wall surface of the container main body 55, and is associated with four locations on the outer peripheral surface of the end portion (left end in FIG. 10) of the container main body 55 located on the front side of the image forming apparatus 100. The joint convex part 55b is protrudingly provided.

  Two fan-shaped toner discharge ports 57 are formed in the cap 56a on the intermediate hopper 6 side. Further, a shutter 58 having an opening 58a having substantially the same shape as the toner discharge port 57 is disposed outside the cap 56a. The cap 56b on the coupling 33 side is detachable from the container main body 55, and the cap 56b is removed to fill the container main body 55 with toner.

  When the toner container 5 supported by the rotating shaft 61 (see FIG. 5) of the intermediate hopper 6 is rotated forward (rotated counterclockwise in FIG. 10), the toner container 5 is accommodated in the container main body 55 by the advance of the phase of the transport rib 55a. The toner thus transferred gradually moves from the cap 56b side to the cap 56a side (intermediate hopper 6 side) along the axial direction (arrow F direction).

  The shutter 58 is a cylindrical member whose inner diameter is slightly larger than the outer diameter of the cap 56a, and projections 60 projecting inward are formed at two opposing edges of the inner peripheral surface. Are formed with notches 62 with which the protrusions 60 are engaged at two opposing ends of the outer peripheral surface. In FIG. 11, only one protrusion 60 is shown.

  12 and 13 are perspective views of the toner container 5 mounted on the hopper upper portion 6a of the intermediate hopper 6 as viewed from the inside of the hopper upper portion 6a. The coupling 33 is engaged with the engaging convex portion 55 b of the toner container 5 located on the front side of the image forming apparatus 100, and the end portion of the toner container 5 located on the rear side of the image forming apparatus 100 has a rotation shaft 61. Is rotatably supported. A torque limiter 65 is provided at a connecting portion between the shutter 58 and the rotating shaft 61, and the shutter 58 rotates around the rotating shaft 61 only when a predetermined torque or more is applied to the shutter 58.

  In a state where the toner container 5 is mounted on the hopper upper portion 6a, as shown in FIG. 12, the opening 58a of the shutter 58 is at a position rotated by approximately 90 ° with respect to the toner discharge port 57 of the cap 56a. 58 is closed. Further, the projection 60 (see FIG. 11) of the shutter 58 is located at the downstream end of the notch 62 (see FIG. 11) of the cap 56a with respect to the forward rotation direction (counterclockwise direction of FIG. 12) of the container body 55. Is engaged.

  When the coupling 33 is rotated forward by the motor 35 (see FIG. 11) from the state of FIG. 12, the container main body 55 and the cap 56a start to rotate around the rotation shaft 61. At this time, since the rotational torque applied to the torque limiter 65 is smaller than the torque required for the rotation of the torque limiter 65, the shutter 58 is kept stationary without being rotated with the container body 55 and the cap 56a.

  Then, as shown in FIG. 13, when the container main body 55 and the cap 56a rotate approximately 90 °, the toner discharge port 57 of the cap 56a and the opening 58a of the shutter 58 overlap, and the toner discharge port 57 is opened. Then, the upstream end of the notch 62 moves to the position of the protrusion 60 of the shutter 58 with respect to the normal rotation direction, and the rotational torque is transmitted to the torque limiter 65 from the container main body 55 and the cap 56a.

  Here, since the rotational torque transmitted to the torque limiter 65 is larger than the torque necessary for the rotation of the torque limiter 65, the shutter 58 rotates forward together with the container main body 55 and the cap 56a with the toner discharge port 57 opened. Therefore, by rotating the container main body 55 forward, the toner in the container main body 55 is supplied to the intermediate hopper 6 through the toner discharge port 57 and the opening 58a.

  On the other hand, when the supply of toner from the toner container 5 is to be stopped, the container main body 55 is obtained by rotating the coupling 33 reversely (rotating clockwise in FIG. 13) by the motor 35 (see FIG. 11) from the state of FIG. And the cap 56a also starts reverse rotation around the rotation axis 61. Thereby, the upstream end of the notch 62 with respect to the forward rotation direction (downstream with respect to the reverse rotation direction) is separated from the protrusion 60 of the shutter 58.

  Since the rotational torque of the container body 55 and the cap 56a is not transmitted to the torque limiter 65 until the upstream end of the notch 62 comes into contact with the protrusion 60 with respect to the reverse rotation direction, the shutter 58 is at the position shown in FIG. Only the container main body 55 and the cap 56a are reversely rotated. As a result, the opening 58a of the shutter 58 moves to the position of FIG. 12 where it does not overlap the toner discharge port 57 of the cap 56a, and the toner discharge port 57 is closed.

  According to the above configuration, when the toner container 5 is attached to the intermediate hopper 6 and removed from the intermediate hopper 6, the toner discharge port is reliably closed by the shutter 58, so that the toner leaks from the toner discharge port 57. Can effectively prevent toner contamination inside and outside the image forming apparatus 100.

  Further, since the toner discharge port 57 is opened and closed by the shutter 58 by the operation of rotating the toner container 5, no special operation for opening and closing the toner discharge port 57 is required, and the toner discharge port is attached when the toner container 5 is mounted. There is no possibility of forgetting to open 57 and failing to supply toner, or when replacing the toner container 5, forgetting to close the toner outlet and causing toner to leak out. Further, since a mechanism for opening and closing the shutter 58 is not required on the toner container 5 side, the toner container 5 has an inexpensive and simple configuration, and the maintenance cost can be reduced.

  Next, a configuration in which the toner discharge port 57 is opened and closed by manually rotating the shutter 58 when the toner container 5 is attached and detached will be described. 14 is a partially enlarged view showing a state in the middle of inserting the toner container 5 according to the second embodiment of the present invention into the image forming apparatus 100, and FIG. 15 shows the toner container 5 according to the second embodiment. FIG. 16 is a partially enlarged view showing a state in which the toner container 5 and the coupling 33 are locked from the state shown in FIG.

  In the toner container 5 of the present embodiment, the engaging convex portions 55 b are projected at two opposing positions on the outer peripheral surface of the container main body 55. Further, a ridge 67 extending in a spiral shape from the respective engaging projections 55 b along the outer peripheral surface of the container main body 55 is provided. On the other hand, on the coupling 33 side, an engagement rib 33a with which the protrusion 67 is engaged by rotating the container body 55 is formed. The configuration of other parts of the toner container 5 is the same as that of the first embodiment shown in FIG.

  When the toner container 5 is attached to the image forming apparatus 100, the toner container 5 is inserted into the coupling 33 from the end on the shutter 58 side, as shown in FIG. As shown in FIG. 15, in a state where the toner container 5 is completely inserted, the end portion of the shutter 58 is supported by the rotating shaft 61 (see FIG. 12), and the engaging convex portion 55b of the container body 55 is connected to the cup. It is arranged at a position overlapping the ring 33.

  In this state, when the cap 56b of the toner container 5 is gripped and manually rotated forward by a predetermined angle (rotated in the clockwise direction in FIG. 15), as shown in FIG. The engagement rib 33a of the ring 33 is screwed and the toner container 5 and the coupling 33 are engaged and fixed (locked). At this time, the container main body 55 and the cap 56a rotate forward by a predetermined angle (about 90 °) around the rotation shaft 61, but the shutter 58 connected to the torque limiter 65 does not rotate with the container main body 55 and the cap 56a. Stay stationary. Therefore, the toner discharge port 57 and the opening 58a overlap (see FIG. 13), and the toner discharge port 57 is opened.

  On the other hand, when the toner container 5 is removed from the hopper upper portion 6a, the cap 56b of the toner container 5 is grasped and manually rotated counterclockwise by a predetermined angle (rotated counterclockwise in FIG. 16). The threaded engagement with the mating rib 33a is released, and the locked state between the toner container 5 and the coupling 33 is released. At this time, the container main body 55 and the cap 56a rotate backward about the rotation axis 61 by a predetermined angle (about 90 °), but the shutter 58 connected to the torque limiter 65 does not rotate with the container main body 55 and the cap 56a. Stay stationary. Accordingly, the toner discharge port 57 and the opening 58a move to a position where they do not overlap (see FIG. 12), and the toner discharge port 57 is closed.

  As described above, if the shutter 58 is manually rotated, the toner container 5 is mounted on the intermediate hopper 6 and the intermediate hopper, similarly to the configuration in which the shutter 58 is rotated using the coupling 33 and the motor 35. When the toner is removed from the toner discharge port 6, the toner discharge port is reliably closed by the shutter 58, so that leakage of toner from the toner discharge port 57 can be reliably prevented.

  In addition, since the toner discharge port 57 is opened and closed by the shutter 58 in the operation of locking or unlocking the toner container 5, there is no fear of forgetting the opening and closing operation of the toner discharge port 57, and the shutter 58 on the toner container 5 side. Therefore, the toner container 5 is inexpensive and has a simple configuration. Furthermore, since it is not necessary to reversely rotate the coupling 33 in order to close the toner discharge port 57 with the shutter 58, the drive control of the motor 35 is simplified.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in the above-described embodiment, the configuration using the developing device 4 using the magnetic one-component developer as shown in FIG. 2 has been described. However, the present invention is not limited to this, and two configurations including a non-magnetic toner and a magnetic carrier are used. The developing device 4 using a component developer may be used. In this case, non-magnetic toner is accommodated in the toner container 5, and toner is supplied from the toner container 5 to the developing device 4 via the intermediate hopper 6 according to consumption of the toner in the developing device 4. Further, in the developing device 4 that supplies both toner and magnetic carrier and discharges excess developer, a two-component developer is accommodated in the toner container 5.

  That is, in the toner container 5 (developer storage container), a one-component developer composed only of toner, a two-component developer composed of toner and a magnetic carrier, or the toner in the two-component developer becomes “developer”. Shall be contained.

  In the above embodiment, the toner discharge port 57 is formed in the cap 56a fixed to the end of the container main body 55 on the intermediate hopper 6 side, but the end of the container main body 55 on the front side of the main body of the container main body 55 to which the cap 56b is attached. The toner discharge port 57 may be directly formed in the container main body 55 with only one opening being open and one end of the container main body 55 on the intermediate hopper 6 side closed.

  The present invention can be used in an image forming apparatus including a detachable developer container that replenishes developer by rotating a container body. By utilizing the present invention, it is possible to open and close the developer discharge port in conjunction with the attaching / detaching operation of the developer container or the developer replenishing operation, and the developer does not leak when the developer container is attached / detached. It is possible to provide a developer container having such a structure and an image forming apparatus including the developer container.

1 Photosensitive drum 4 Developing device 5 Toner container (developer container)
6 Intermediate hopper (developer supply mechanism)
6a Upper hopper 6b Lower hopper 20 Developing container 20a Toner supply port 25 Developing roller 33 Coupling (drive mechanism)
33a engagement rib 35 motor (drive mechanism)
41 Support Frame 55 Container Body 55a Conveying Rib 55b Engaging Projection 56a, 56b Cap 57 Toner Discharge Port (Developer Discharge Port)
58 Shutter 58a Opening 61 Rotating Shaft 65 Torque Limiter 67 Projection 70 Toner Transport Path 100 Image Forming Apparatus

Claims (5)

A cylindrical container body for containing the developer;
A developer outlet that is formed at one end of the container body and discharges the developer in the container body;
An engaging projection formed on the outer peripheral surface of the other end of the container body;
The container body can be rotated within a range of a predetermined angle, and is mounted so that rotation with respect to the container body is regulated at both ends of the predetermined angle, and an opening is formed in a part of the surface facing the developer discharge port A shutter, and
A detachable developer container for discharging the developer from the developer discharge port by rotating the container body in the circumferential direction;
A developer supply mechanism that rotatably supports the developer container and supplies the developer discharged from the developer discharge port to a developing device;
A drive mechanism that has a ring-shaped coupling that engages with the engaging projection, and rotates the developer container in the developer supply direction by rotating the coupling;
In an image forming apparatus comprising:
The developer supply mechanism is provided with a torque limiter that engages with the shutter when the developer container is mounted.
When the developer container is rotated in the developer supply direction, the container main body is rotated by a predetermined angle while the shutter is stationary by the torque limiter, the developer discharge port is opened, and the developer container is rotated. And the shutter is rotated integrally with the container body with the developer discharge port opened, and the supply of the developer from the developer discharge port is executed, and the developer container is 2. An image forming apparatus according to claim 1, wherein when rotating in a direction opposite to the developer supply direction, the container main body rotates in a reverse direction by a predetermined angle while the shutter is stationary by the torque limiter to close the developer discharge port.   The developer supply mechanism is disposed on one end side of the container body where the developer discharge port is formed, and the drive mechanism is disposed on the other end side of the container body where the engagement convex portion is formed. The image forming apparatus according to claim 1, wherein the image forming apparatus is disposed.   The drive mechanism is capable of rotating the developer container in a direction opposite to the developer supply direction, and the developer is accompanied by a developer supply operation for rotating the developer container in the developer supply direction. 2. The developer discharge port is closed by opening the discharge port and rotating the developer container a predetermined angle in the direction opposite to the developer supply direction when stopping the developer supply operation. Alternatively, the image forming apparatus according to claim 2.   The developer container is manually rotated by a predetermined angle in the developer supply direction so that the developer container and the drive mechanism are engaged and fixed, the developer discharge port is opened, and the developer container is 2. The engagement state between the developer container and the drive mechanism is released and the developer discharge port is closed by manually rotating a predetermined angle in a direction opposite to the developer supply direction. Alternatively, the image forming apparatus according to claim 2. The image forming apparatus according to any one of claims 1 to 4, wherein the image forming apparatus is detachably mounted.
A cylindrical container body for containing the developer;
A developer discharge port formed at one end of the container body for discharging the developer in the container body;
An engaging projection formed on the outer peripheral surface of the other end of the container body, and engaging with a coupling on the image forming apparatus body side;
A shutter that is rotatably mounted in a range of a predetermined angle with respect to the container main body, and has an opening formed in a part of a surface facing the developer discharge port;
A developer container that discharges the developer from the developer discharge port by rotating the container body in the circumferential direction.

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