JP5657770B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus, development processing is performed by supplying toner from a developing unit to an electrostatic latent image formed on the surface of a photosensitive drum or the like. Further, the toner used for such development processing is supplied to the developing device from a toner container that is detachably attached to the developing device. Therefore, the developing device is provided with a supply port for receiving toner from the toner container. This replenishing port is usually covered with an openable / closable shutter (see Patent Document 1).

  A configuration example of a conventional shutter is shown in FIG. The shutter 121 includes an inclined surface 122 that is obliquely upward, and has a substantially triangular shape when viewed from the side. The shutter 121 is slidable linearly between a position where the replenishing port 124 provided in the developing device 123 is closed (see a two-dot chain line) and a position where the replenishing port 124 is opened (see a solid line). When a toner container (not shown) is not attached to the developing device 123, the toner container is biased to a position where the supply port 124 is closed by a pair of coil springs 125 provided on both sides of the supply port 124.

  In this state, as shown by an arrow in FIG. 16, when a toner container (not shown) is attached to the developing device 123 from above, the toner container presses the inclined surface 122 of the shutter 121 from above and closes the supply port 124. The shutter 121 slides linearly from the position where the supply port 124 is opened to the position where the supply port 124 is opened.

Japanese Patent Laid-Open No. 2005-134452

  However, in such a configuration using a linearly sliding shutter, biasing members such as coil springs must be arranged on both sides of the replenishing port in order to ensure the operational stability of the shutter. Is required. Therefore, an increase in the number of parts and an increase in manufacturing cost have been caused.

  In view of the above circumstances, an object of the present invention is to reduce the number of urging members and reduce the manufacturing cost while ensuring the operational stability of the shutter.

  The image forming apparatus according to the present invention includes a toner container having a container main body provided with a discharge port for discharging toner, a developing device main body provided with a replenishing port for receiving toner discharged from the discharge port, and the developing device. A developing device having a shutter that opens and closes the supply port by rotating along the outer surface of the main body, a seal member provided around the supply port and in contact with the shutter, and a position for closing the supply port An urging member that urges the shutter, and a container that is rotatably attached to the container body to open and close the discharge port, and to open the replenishment port against the urging force of the urging member. And a container-side shutter that presses the shutter.

  In the image forming apparatus according to the aspect of the invention, the shutter includes a fulcrum portion that is a center of rotation of the shutter, and an opening / closing portion that opens and closes the supply port according to the rotation around the fulcrum portion. The portion of the shutter that is farther from the fulcrum than the opening / closing portion may be pressed.

  By adopting such a configuration, it is possible to open and close with less force than when pressing the opening / closing part of the shutter with the pressing member or when pressing the part closer to the fulcrum than the opening / closing part of the shutter with the pressing member. The part can be displaced.

  In the image forming apparatus according to the aspect of the invention, the shutter includes a fulcrum portion that is a center of rotation of the shutter, and an opening / closing portion that opens and closes the supply port according to the rotation around the fulcrum portion. The portion closer to the fulcrum portion than the opening / closing portion of the shutter may be pressed.

  By adopting such a configuration, it is possible to make the displacement amount of the opening / closing portion larger than the displacement amount of the portion pressed by the shutter.

  According to the present invention, it is possible to reduce the manufacturing cost by reducing the number of urging members while ensuring the operational stability of the shutter.

1 is a schematic diagram illustrating an outline of a printer according to a first embodiment of the present invention. FIG. 3 is a perspective sectional view from the rear side showing the toner container in the printer according to the first exemplary embodiment of the present invention. FIG. 4 is a perspective cross-sectional view from the left rear side showing a state in which the container side shutter opens the discharge port and the developing device side shutter opens the supply port in the printer according to the first embodiment of the present invention. FIG. 4 is a right side view illustrating a state where a lever gripping portion is tilted forward in the toner container of the printer according to the first exemplary embodiment of the present invention. FIG. 4 is a right side view illustrating a state in which a lever gripping portion is tilted backward in the toner container of the printer according to the first exemplary embodiment of the present invention. FIG. 3 is an exploded perspective view showing a toner container in the printer according to the first embodiment of the present invention. FIG. 3 is a perspective view from the lower right side showing the toner container in the printer according to the first embodiment of the present invention. FIG. 2 is a schematic diagram showing an outline of an image forming unit in the printer according to the first embodiment of the present invention. FIG. 3 is a perspective view from the right front side illustrating a state in which the toner container is mounted on the developing device in the printer according to the first exemplary embodiment of the present invention. FIG. 3 is a perspective view from the left front side showing the image forming unit in the printer according to the first embodiment of the present invention. FIG. 3 is a perspective view showing the vicinity of a supply port in the developing device of the printer according to the first embodiment of the present invention. It is AA sectional drawing of FIG. FIG. 3 is a perspective cross-sectional view from the left rear side showing a state in which the container side shutter closes the discharge port and the developing device side shutter closes the supply port in the printer according to the first embodiment of the present invention. (A) is a schematic diagram showing the amount of displacement of the opening / closing portion when a portion separated from the fulcrum portion is pressed rather than the opening / closing portion of the developing device side shutter, and (b) is from the opening / closing portion of the developing device side shutter. It is a schematic diagram which shows the displacement amount of an opening-and-closing part when the part which approached the fulcrum part is pressed. FIG. 6 is a perspective view showing the vicinity of a supply port in a developing device of a printer according to a second embodiment of the present invention. It is a perspective view which shows the structural example of the conventional shutter.

<First Embodiment>
First, the overall configuration of the electrophotographic printer 1 will be described with reference to FIG. FIG. 1 is a schematic diagram illustrating an outline of a printer according to a first embodiment of the present invention. Hereinafter, the left side in FIG. 1 is the front side (front side) of the printer 1.

  The printer 1 includes a box-shaped printer main body 2. A paper feed cassette 3 for storing paper (not shown) is accommodated in the lower portion of the printer main body 2, and a paper discharge tray is disposed on the upper surface of the printer main body 2. 4 is provided. An upper cover 5 is attached to the upper surface of the printer main body 2 so as to be openable and closable in front of the paper discharge tray 4, and a toner container 6 is stored below the upper cover 5.

  An exposure unit 7 composed of a laser scanning unit (LSU) is disposed below the discharge tray 4 above the printer body 2, and an image forming unit 8 is provided below the exposure unit 7. Yes. The image forming unit 8 is rotatably provided with a photosensitive drum 10 as an image carrier. Around the photosensitive drum 10, a charger 11, a developing device 12, a transfer roller 13, and a cleaning device are provided. The apparatus 14 is disposed along the rotation direction of the photosensitive drum 10 (see arrow X in FIG. 1).

  A paper transport path 15 is provided inside the printer main body 2. A paper feed unit 16 is provided at the upstream end of the conveyance path 15, and a transfer unit 17 configured by the photosensitive drum 10 and the transfer roller 13 is provided at a middle portion of the conveyance path 15. Is provided with a fixing device 18, and a paper discharge unit 20 is provided at the downstream end of the conveyance path 15. A reverse path 21 for double-sided printing is formed below the transport path 15.

  Next, an image forming operation of the printer 1 having such a configuration will be described.

  When the printer 1 is turned on, various parameters are initialized, and initial setting such as temperature setting of the fixing device 18 is executed. Then, when image data is input from a computer or the like connected to the printer 1 and an instruction to start printing is given, an image forming operation is executed as follows.

  First, after the surface of the photosensitive drum 10 is charged by the charger 11, exposure corresponding to the image data is performed on the photosensitive drum 10 by laser light from the exposure device 7 (see the two-dot chain line P in FIG. 1). The electrostatic latent image is formed on the surface of the photosensitive drum 10. Next, the electrostatic latent image is developed by the developing device 12 into a toner image with toner.

  On the other hand, the sheet taken out from the sheet cassette 3 by the sheet feeding unit 16 is conveyed to the transfer unit 17 in synchronization with the above-described image forming operation, and the toner image on the photosensitive drum 10 is transferred to the sheet by the transfer unit 17. Is transferred to. The sheet on which the toner image has been transferred is conveyed downstream in the conveyance path 15 and enters the fixing device 18 where the toner image is fixed on the sheet. The paper on which the toner image is fixed is discharged from the paper discharge unit 20 to the paper discharge tray 4. The toner remaining on the photosensitive drum 10 is collected by the cleaning device 14.

  Next, the toner container 6 will be described in detail mainly with reference to FIGS. FIG. 2 is a perspective cross-sectional view from the rear side showing the toner container in the printer according to the first embodiment of the present invention. FIG. 3 is a perspective cross-sectional view from the left rear side showing a state where the container side shutter opens the discharge port and the developing device side shutter opens the supply port in the printer according to the first embodiment of the present invention. It is. FIG. 4 is a right side view showing a state where the lever gripping portion is tilted forward in the toner container of the printer according to the first embodiment of the present invention. FIG. 5 is a right side view showing a state in which the lever gripping portion is tilted backward in the toner container of the printer according to the first embodiment of the present invention. FIG. 6 is an exploded perspective view showing the toner container in the printer according to the first embodiment of the present invention. FIG. 7 is a perspective view showing the toner container from the lower right side in the printer according to the first embodiment of the present invention.

  An arrow Fr appropriately attached to each figure indicates the front side (front side) of the printer 1 (the same applies to FIG. 8 and subsequent figures). Since FIG. 2 is a perspective sectional view from the rear side, the left-right relationship on the drawing and the actual left-right relationship are reversed. That is, the right side of the drawing in FIG. 2 is the left side of the toner container 6, and the left side of the drawing in FIG. 2 is the right side of the toner container 6.

  As shown in FIG. 1, the toner container 6 is disposed below the upper cover 5 of the printer body 2. The toner container 6 is detachably attached to the developing device 12, and when the toner is used up, the toner container 6 can be replaced by opening the upper cover 5 (see the two-dot chain line in FIG. 1). ).

  As best shown in FIG. 2, the toner container 6 includes a box-shaped container main body 22 having an open upper surface, a transport screw 23 accommodated in a rear lower portion of the container main body 22, and a substantially center of the container main body 22. A stirring paddle 24 accommodated in the container body, a lid 25 covering the upper surface of the container body 22, a lever 26 attached to the right end of the container body 22, and a transmission member disposed at the right end of the container body 22 together with the lever 26. 27 and a container-side shutter 28 attached to the lower right end of the container body 22. The transmission member 27 is not shown except for FIGS.

  The container body 22 contains toner and has a shape that is long in the left-right direction. A toner filling port 31 is formed in the left end wall 30 of the container body 22, and the toner filling port 31 is closed by a cap 32. A main body side flange portion 33 is provided on the outer periphery of the upper end of the container main body 22.

  A cylindrical discharge duct 34 protrudes rightward from the lower right end of the container body 22, and an opening 36 is formed at the right end of the discharge duct 34. As best shown in FIG. 3, a discharge port 35 for discharging the toner is formed at the bottom of the discharge duct 34. A seal member 37 is attached to the lower outer periphery of the discharge duct 34, and a communication port 38 is formed in the seal member 37 at a position corresponding to the discharge port 35.

  As shown in FIG. 4, a cylindrical boss 42 having a communication hole 41 projects from the center of the right end wall 40 of the container body 22 toward the right side (outside). On the right surface (outer surface) of the right end wall 40 of the container main body 22, a first restriction rib 43 projects from the rear upper side of the boss 42. On the right surface of the right end wall 40 of the container body 22, a second restriction rib 44 projects from the front upper side of the boss 42. A concave portion 45 is provided on the upper portion of the second restriction rib 44. A cylindrical projection 46 is provided below the first regulating rib 43 on the right surface of the right end wall 40 of the container body 22.

  As best shown in FIG. 2, the conveying screw 23 has a long shape in the left-right direction. The conveying screw 23 includes a rod-shaped rotating shaft 47 and a spiral fin 48 provided concentrically on the outer periphery of the rotating shaft 47. The left end portion of the rotation shaft 47 is pivotally supported on the left end wall 30 of the container body 22. The right side portions of the rotating shaft 47 and the spiral fin 48 are inserted into the discharge duct 34. The right end portion of the rotating shaft 47 protrudes to the right from the discharge duct 34 through the opening 36, and a conveying gear 50 is fixed to the protruding portion.

  The stirring paddle 24 is disposed on the upper front side of the conveying screw 23 and has a shape that is long in the left-right direction. The stirring paddle 24 includes a support frame 51 having a frame plate shape, and a sheet-like stirring blade 52 supported by the support frame 51. The left and right ends of the support frame 51 are pivotally supported on the left end wall 30 and the right end wall 40 of the container main body 22 via bearings 49 (refer to FIG. 3, hereinafter referred to as “bearings 49 of the stirring paddle 24”). Yes. As shown in FIG. 4 and the like, the bearing 49 of the stirring paddle 24 attached to the right end wall 40 is provided with an engagement receiving portion 53 at a position corresponding to the communication hole 41 of the boss 42.

  The stirring blade 52 is made of a synthetic resin sheet such as Lumirror (trade name), for example. As shown in FIG. 2 and the like, one side of the stirring blade 52 is fixed to the support frame 51 along the left-right direction. The stirring blade 52 is provided with a plurality of cut grooves 54.

  A lid body side flange portion 55 having a shape corresponding to the body side flange portion 33 of the container body 22 is provided at the lower end of the lid body 25, and the body side flange portion 33 and the lid body side flange portion 55 are ultrasonically welded. Thus, the container body 22 and the lid body 25 are integrated. A recess 56 is formed in the center of the lid 25 in the left-right direction.

  As shown in FIG. 4 and the like, the lever 26 includes a lever body 57 having a circular outline in a side view. The lever main body 57 includes a cylindrical small-diameter cylindrical portion 58, a cylindrical large-diameter cylindrical portion 60 provided on the outer periphery of the small-diameter cylindrical portion 58, and extends radially to connect the small-diameter cylindrical portion 58 and the large-diameter cylindrical portion 60. And four connecting portions 61. The small-diameter cylindrical portion 58 is attached to the outer periphery of a boss 42 provided on the right end wall 40 of the container body 22, whereby the lever 26 is rotatably supported by the container body 22.

  A gripping part 62 projects from the upper part of the large-diameter cylindrical part 60. The upper end of the grip portion 62 extends to the right side of the lid body 25. The holding portion 62 is regulated in the forward tilt angle by the second regulating rib 44 (see FIG. 4), and the backward tilt angle is regulated by the first regulating rib 43 (see FIG. 5). A protruding piece 63 is provided on the upper portion of the large-diameter cylindrical portion 60 in front of the grip portion 62. As shown in FIG. 5, the projecting piece 63 is engaged with the concave portion 45 of the second regulating rib 44 in a state where the gripping portion 62 is tilted backward. A lever side gear 64 is provided on the outer periphery of the rear lower portion of the large diameter cylindrical portion 60.

  As best shown in FIG. 6, the transmission member 27 includes a disk-shaped transmission member main body 65. On the right surface (outer surface) of the transmission member main body 65, a transmission coupling 66 having a triangular prism shape in a side view is projected. An engagement piece 67 projects from the left surface (inner surface) of the transmission member main body 65. The engagement piece 67 is inserted into the communication hole 41 provided in the boss 42 of the container body 22 and is engaged with an engagement receiving portion 53 (see FIG. 4 and the like) provided in the bearing 49 of the stirring paddle 24. . As a result, the transmission member 27 and the stirring paddle 24 are connected to rotate integrally.

  As shown in FIG. 6, a transmission gear 68 is provided on the outer periphery of the transmission member main body 65. This transmission gear 68 meshes with a conveyance gear 50 (shown in a state separated from the rotation shaft 47 in FIG. 6) fixed to the rotation shaft 47 of the conveyance screw 23, and with the rotation of the transmission member 27. Thus, the conveying screw 23 is rotated.

  The container-side shutter 28 has a cylindrical shape and is rotatably mounted on the outer periphery of the discharge duct 34 of the container body 22. A discharge opening 70 is formed on the lower surface of the container-side shutter 28. As best shown in FIG. 3, the discharge opening 70 is provided at a position corresponding to the discharge port 35 of the container body 22 and the communication port 38 of the seal member 37.

  As shown in FIG. 4 and the like, the container-side shutter 28 is provided with a substantially fan-shaped guide piece 71 protruding forward. An arcuate guide hole 72 is provided in the guide piece 71, and the protrusion 46 of the container body 22 is engaged with the guide hole 72.

  As best shown in FIG. 2, the container-side shutter 28 is provided with a cylindrical bearing portion 73, and the right end portion of the rotation shaft 47 of the conveying screw 23 is pivotally supported on the bearing portion 73. . A gear storage portion 74 is provided on the right side of the bearing portion 73, and the transport gear 50 is stored in the gear storage portion 74. As best shown in FIG. 7, a communication opening 75 is formed in the gear storage portion 74, and the conveyance gear 50 can be stored in the gear storage portion 74 via this communication opening 75. Yes.

  The container side shutter 28 is provided with a shutter side gear 76. The shutter side gear 76 meshes with the lever side gear 64 of the lever 26, and the container side shutter 28 rotates in the opposite direction to the lever 26 as the lever 26 rotates. A lock piece 77 is provided at the right end of the container-side shutter 28. The lock piece 77 includes a pair of opposed flat portions 78 and a pair of curved surface portions 79 that connect both ends of the flat portion 78, and has an oval cross-sectional shape. On the outer periphery of the lower part of the container-side shutter 28, a pressing protrusion 80 is provided to the right of the discharge opening 70, and a window 81 is provided above the pressing protrusion 80.

  Next, the developing device 12 will be described in detail with reference to FIGS. 3 and 8 to 13. FIG. 3 is a left rear side showing the state where the container side shutter opens the discharge port and the developer unit side shutter opens the supply port in the printer according to the first embodiment of the present invention as described above. FIG. FIG. 8 is a schematic diagram showing an outline of the image forming unit in the printer according to the first embodiment of the present invention. FIG. 9 is a perspective view from the right front side showing a state in which the toner container is mounted on the developing device in the printer according to the first embodiment of the present invention. FIG. 10 is a perspective view from the left front side showing the image forming unit in the printer according to the first embodiment of the present invention. FIG. 11 is a perspective view showing the periphery of the supply port in the developing device of the printer according to the first embodiment of the present invention. 12 is a cross-sectional view taken along the line AA in FIG. FIG. 13 is a perspective cross-sectional view from the left rear side showing a state where the container-side shutter closes the discharge port and the developer-side shutter closes the supply port in the printer according to the first embodiment of the present invention. It is.

  As shown in FIG. 8, the developing device 12 is integrated with the photosensitive drum 10, the charger 11, and the cleaning device 14 to constitute an image forming unit 82. The developing device 12 includes a box-shaped developing device main body 83. A partition wall 84 extending in the vertical direction is provided in the center of the inside of the developing device main body 83, and stirring members 85 are accommodated in front and rear of the partition wall 84, respectively. Each stirring member 85 is rotatably supported by the developing device main body 83. A developing roller 86 is housed inside the developing device main body 83 at the rear lower side of the rear stirring member 85. The developing roller 86 is rotatably supported by the developing device main body 83 and is in contact with the surface of the photosensitive drum 10. As shown in FIG. 9, the toner container 6 is detachably mounted on the upper surface side of the developing device main body 83.

  As shown in FIG. 3 and the like, a replenishing port 88 is formed in the upper wall 87 of the developing device main body 83 in the vertical direction. A seal member 90 is fixed around the supply port 88 on the upper surface of the upper wall 87 of the developing device main body 83 (a part of the outer surface of the developing device main body 83). The seal member 90 is formed of an elastic member such as a sponge, for example. As shown in FIGS. 10 and 11, a replenishment opening 91 is formed in the seal member 90 at a position corresponding to the replenishment port 88 of the developing device main body 83. The front end portion of the seal member 90 is placed on a pedestal portion 92 projecting from the upper wall 87 of the developing device main body 83, and is curved in an arc shape toward the front upper side.

  As shown in FIG. 11, a restriction projection 89 is provided on the upper surface of the upper wall 87 of the developing device main body 83 at the rear of the seal member 90. On the upper surface of the upper wall 87 of the developing device main body 83, a spring accommodating portion 93 is formed on the right side of the seal member 90 along the front-rear direction. The spring accommodating portion 93 accommodates a coil spring 94 as an urging member, and the rear end portion of the coil spring 94 is in contact with the rear surface of the spring accommodating portion 93. The rear part of the coil spring 94 is covered with an arch-shaped spring holding piece 95 installed above the spring accommodating part 93.

  On the upper surface of the upper wall 87 of the developing device main body 83, an engaging portion 96 projects from the seal member 90 to the left along the front-rear direction. An engaging groove 97 is formed in the engaging portion 96 along the front-rear direction (see FIG. 12).

  As shown in FIG. 10 and the like, a developing device side shutter 98 is attached to the upper surface side of the upper wall 87 of the developing device main body 83. The developing device side shutter 98 has a flat plate shape that is long in the left-right direction. A fulcrum portion 100 is provided at the left end portion of the developing device side shutter 98, and the developing device side shutter 98 rotates in the front-rear direction along the upper surface of the upper wall 87 of the developing device main body 83 around the fulcrum portion 100. It has become. A gently bent portion 101 is formed at the central portion in the left-right direction of the developing device side shutter 98.

  As shown in FIG. 11, a thin opening / closing part 102 is provided on the right side of the developing device side shutter 98. The lower surface of the opening / closing portion 102 is in contact with the upper surface of the seal member 90, and the replenishment port 88 of the developing device main body 83 and the seal member 90 are replenished as the developing device side shutter 98 rotates around the fulcrum portion 100. The opening / closing part 102 opens and closes the opening 91. Hereinafter, the position (see FIG. 3) where the toner replenishing port 88 of the developing device main body 83 and the replenishment opening 91 of the seal member 90 are opened is referred to as the open position of the opening / closing portion 102, and the toner replenishing port 88 of the developing device main body 83 and The position where the replenishment opening 91 of the seal member 90 is closed (see FIG. 13) is referred to as the closing position of the opening / closing section 102.

  As shown in FIG. 11, the developer-side shutter 98 is provided with a rectangular notch 103 on the right side of the opening / closing part 102, and an abutment piece 104 projects from the notch 103. . As shown in FIG. 10, the contact piece 104 is provided at a position farther from the fulcrum part 100 than the opening / closing part 102.

  As shown in FIG. 11, a spring receiving portion 105 is provided behind the contact piece 104. A front end portion of a coil spring 94 is attached to the spring receiving portion 105, whereby the opening / closing portion 102 of the developing device side shutter 98 is biased to the closed position. The developing device side shutter 98 is provided with an arch-shaped spring holding portion 106 behind the spring receiving portion 105, and the upper side of the coil spring 94 is covered by the spring holding portion 106.

  As shown in FIG. 12, the developing device side shutter 98 is provided with a communication hole 109 on the left side of the opening / closing part 102, and is directed from the communication hole 109 toward the developing device main body 83 side (lower side in the present embodiment). An L-shaped hook 107 is projected. The hook 107 is inserted into an engaging groove 97 provided in the engaging portion 96 of the developing device main body 83 and is engaged with the engaging portion 96.

  As shown in FIG. 10, a driving mechanism 110 is provided at the right end of the developing device main body 83. The driving mechanism 110 is provided with a driving coupling 111 having a triangular cylindrical shape in a side view connected to driving means (not shown) such as a motor.

  When the toner container 6 is mounted on the developing device 12 with the gripping portion 62 of the lever 26 tilted forward as shown in FIG. 9, the container-side shutter as shown in FIG. 28 pressing projections 80 abut against the abutting piece 104 of the developing device side shutter 98. At this time, as shown in FIG. 13, the discharge port 35 of the container body 22 is closed by the container side shutter 28, and the replenishment port 88 of the developing device body 83 is closed by the opening / closing part 102 of the developing device side shutter 98. . Therefore, the communication between the inside of the container main body 22 and the inside of the developing device main body 83 is blocked.

  In this state, as shown by an arrow Y in FIG. 4, when an operator such as a user or a serviceman tilts the gripping portion 62 of the lever 26 to the rear side, the lever 26 is centered around the boss 42 of the container body 22. It rotates in the direction (clockwise on the drawing) (see FIG. 5). With this rotation, as indicated by an arrow Z in FIG. 4, the container-side shutter 28 connected to the lever 26 rotates in one direction (counterclockwise in the drawing) with respect to the container body 22 (see FIG. 5). ). By the rotation of the container side shutter 28, the discharge opening 70 of the container side shutter 28 is moved directly below the discharge port 35 of the container body 22 and the communication port 38 of the seal member 37, as shown in FIG. 3. That is, the container side shutter 28 opens the discharge port 35 of the container body 22.

  As the container-side shutter 28 rotates, the pressing protrusion 80 of the container-side shutter 28 presses the contact piece 104 of the developer-side shutter 98 backward as shown in FIGS. With this pressing, the developing device side shutter 98 rotates rearward about the fulcrum portion 100, and the opening / closing portion 102 of the developing device side shutter 98 is displaced from the closed position to the open position as shown in FIG. That is, the developing device side shutter 98 opens the supply port 88 of the developing device main body 83. As described above, the discharge port 35 of the container main body 22 and the replenishment port 88 of the developing device main body 83 are opened, so that the inside of the container main body 22 and the inside of the developing device main body 83 communicate with each other.

  The driving coupling 111 is connected to the transmission coupling 66 in conjunction with the rotation of the lever 26 described above. In this state, when driving means such as a motor connected to the driving coupling 111 rotates, the rotation is transmitted to the transmission member 27 via the driving coupling 111 and the transmission coupling 66, and the transmission member 27 is Rotate. When the transmission member 27 rotates in this way, the agitation paddle 24 connected to the transmission member 27 rotates, and the toner in the container body 22 is conveyed toward the conveyance screw 23 while being agitated. Further, when the transmission member 27 rotates as described above, this rotation is transmitted to the rotation shaft 47 of the conveyance screw 23 via the transmission gear 68 and the conveyance gear 50, and the conveyance screw 23 rotates. Along with this, the toner in the container main body 22 is discharged from the discharge port 35 and introduced into the inside of the developing device main body 83 through the supply port 88. The toner introduced into the inside of the developing device main body 83 is stirred by each stirring member 85 and then conveyed to the developing roller 86 and supplied from the developing roller 86 to the photosensitive drum 10.

  In the present embodiment, as described above, the replenishing port 88 is opened and closed using the rotary developer-side shutter 98. Accordingly, it is possible to sufficiently ensure the operational stability of the developing device side shutter 98 while adopting a configuration in which the coil spring 94 is disposed only on one side (right side in the present embodiment) of the supply port 88. ing. Therefore, the number of coil springs 94 can be reduced as compared with the case where the developer-side shutter that slides linearly is used, and the manufacturing cost can be reduced.

  Further, since a seal member 90 provided around the replenishing port 88 and contacting the developing device side shutter 98 is fixed to the developing device main body 83, toner leakage between the toner container 6 and the developing device 12 is prevented. The developing device side shutter 98 can be reliably operated. Further, the developing device main body 83 is provided with an engaging portion 96 along the rotation direction (front-rear direction) of the developing device side shutter 98, and the developing device side shutter 98 is engaged with the developing device main body 83 so as to protrude. A hook 107 that engages with the portion 96 is provided. For this reason, it is possible to prevent the developing device side shutter 98 from being lifted and to ensure that the developing device side shutter 98 is in close contact with the seal member 90.

  Further, the pressing protrusion 80 of the container side shutter 28 presses the contact piece 104 provided at a position farther from the fulcrum part 100 than the opening / closing part 102. Therefore, when the opening / closing portion 102 of the developing device side shutter 98 is pressed by the pressing protrusion 80 of the container side shutter 28, or the portion closer to the fulcrum portion 100 than the opening / closing portion 102 of the developing device side shutter 98 is pressed by the container side shutter 28. Compared to the case where the projection 80 is pressed, the opening / closing part 102 can be displaced with a small force.

  On the other hand, in another different embodiment, a portion closer to the fulcrum portion 100 than the opening / closing portion 102 of the developing device side shutter 98 may be pressed by a pressing member such as the container side shutter 28. The effect in this case will be described with reference to FIG. FIG. 14A is a schematic diagram showing the amount of displacement of the opening / closing portion when a portion separated from the fulcrum portion is pressed rather than the opening / closing portion of the developing device side shutter, and FIG. 14B is a developing device side shutter. It is a schematic diagram which shows the displacement amount of an opening / closing part when the part which approached the fulcrum part rather than the opening / closing part of this is pressed. In addition, the arrow F of Fig.14 (a) and FIG.14 (b) has shown the press location by a press member, respectively.

  As shown in FIG. 14A, when a pressing member presses a portion farther from the fulcrum portion 100 than the opening / closing portion 102 of the developing device side shutter 98, the displacement of the pressed portion of the developing device side shutter 98 is changed. The displacement amount L2 of the opening / closing part 102 is smaller than the amount L1. On the other hand, as shown in FIG. 14B, when the portion closer to the fulcrum portion 100 than the opening / closing portion 102 of the developing device side shutter 98 is pressed by the pressing member, the developing device side shutter 98 is It becomes possible to make the displacement amount L2 of the opening / closing part 102 larger than the displacement amount L1 of the pressed portion. In another different embodiment, the opening / closing part 102 of the developing device side shutter 98 can be pressed by a pressing member.

  In the present embodiment, the case where the developer-side shutter 98 is pressed by the rotary container-side shutter 28 has been described. However, in another different embodiment, the developer-side shutter 98 is linearly slid by the container-side shutter 28. You may press. Further, a configuration in which the developing device side shutter 98 is pressed by the container main body 22 of the toner container 6 may be employed.

  In the present embodiment, the case where the configuration of the present invention is applied to the printer 1 has been described. However, in another different embodiment, the configuration of the present invention is applied to an image forming apparatus other than the printer 1 such as a copying machine, a facsimile machine, or a multifunction peripheral. It may be applied.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 15 is a perspective view showing the periphery of the supply port in the developing device of the printer according to the second embodiment of the present invention. In addition, about the structure similar to 1st Embodiment, the same number as 1st Embodiment is attached | subjected on drawing, and description is abbreviate | omitted.

  On the upper surface of the upper wall 87 of the developing device main body 83, a groove-like toner collecting portion 112 is recessed adjacent to the supply port 88 of the developing device main body 83. The toner recovery unit 112 has a rectangular parallelepiped shape.

  At the front edge of the opening / closing part 102 of the developing device side shutter 98, a toner conveying part 113 that is inclined rearward toward the right is provided. The toner conveying unit 113 is inclined with respect to the rotation direction of the developing device side shutter 98 (the front-rear direction in the present embodiment; see the two-dot chain line A in FIG. 15).

  In such a configuration, when the opening / closing part 102 moves from the open position to the closed position as the developing device side shutter 98 rotates (see the two-dot chain line in FIG. 15), the periphery of the supply port 88 (for example, a seal member) The toner adhering to the upper surface 90 is conveyed by the toner conveying unit 113 to the toner collecting unit 112.

  By adopting such a configuration, it is possible to prevent the surroundings of the supply port 88 from being contaminated by toner without providing a member for cleaning the periphery of the supply port 88 separately from the developing device side shutter 98. It becomes possible.

  In the present embodiment, the case where the toner collection unit 112 is provided on the right side of the replenishment port 88 (the side away from the fulcrum unit 100 in the developer-side shutter 98) has been described. You may provide in the left side (the side which approaches the fulcrum part 100 in the developing device side shutter 98) of the supply port 88. FIG. In this case, it is necessary to incline the toner conveying portion 113 backward toward the left.

1 Printer (image forming device)
6 Toner container (toner container)
12 Developing Device 22 Container Body 28 Container Side Shutter 35 Discharge Port 83 Developing Device Body 88 Supply Port 90 Seal Member 94 Coil Spring (Biasing Member)
98 Developer side shutter 100 Support point 102 Opening / closing part

Claims (1)

A toner container having a container body provided with a discharge port for discharging toner;
A developing unit having a replenishing port provided with a replenishing port for receiving toner discharged from the discharge port; and a shutter that opens and closes the replenishing port by rotating along an outer surface of the developing unit body;
A seal member provided around the replenishing port and in contact with the shutter;
A biasing member that biases the shutter to a position for closing the replenishing port;
A container-side shutter that is rotatably mounted on the container body, opens and closes the discharge port, and presses the shutter at a position that opens the supply port against the biasing force of the biasing member ,
The shutter includes a fulcrum part that is the center of rotation thereof, and an opening / closing part that opens and closes the replenishing port with rotation about the fulcrum part.
The image forming apparatus , wherein the container-side shutter presses a portion closer to the fulcrum portion than the opening / closing portion of the shutter .