JP5352725B2 - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To open and close a shutter member on a first unit side in response to attachment-detachment of a second unit. <P>SOLUTION: A toner container 50 (second unit) comprises: a container body 51 having a toner discharge port 511; and a shutter member of the toner discharge port 511 and is assembled in a developing device 33 with a direction orthogonal to the shaft direction of a developing roller 331 as an assembling direction and the shutter member is displaced associated with the assembling to open the toner discharge port 511. The developing device 33 (first unit) comprises: a developing housing 60 including a toner supply port 60H; and a developing shutter plate 62 (shutter member on the first unit side) which can be displaced to a closing position for closing the toner supply port 60H and an opening position for opening the toner supply port 60H. The container body 51 has a first pressing plate 542, the developing shutter plate 62 has a skew convex 622, and the skew convex 622 converts a pressing force of the toner container 50 into a displacement force of the developing shutter plate 62 to displace the developing shutter plate 62 from a closing position to an opening position. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to an image forming apparatus.

  As an image forming apparatus such as a printer, a developing device (first unit member) is arranged around a photosensitive drum, and an electrostatic latent image formed on the photosensitive drum is developed with toner by this developing device. It has been. A toner container (second unit member) is detachably attached to the developing device, and toner is supplied from the toner container to the developing device as the toner decreases.

  As a developing device provided with this type of toner container, for example, a device described in Patent Document 1 is known. The developing device described in this document 1 includes a cylindrical toner container mounting portion extending in parallel with the axial direction of the developing roller (rotating member), and replenishment toner is accommodated in the toner container mounting portion. A toner container is removably assembled. When assembling the toner container, the user inserts the toner container from one end side of the toner container mounting portion into the inside thereof, and then rotates the toner container in a specific direction. By this rotation, the toner supply port (developer supply port) on the developing device side and the toner discharge port on the toner container side coincide with each other, and the shutter member blocking the toner supply port is the inner peripheral surface of the toner container mounting portion. Move in the circumferential direction. As a result, toner can be supplied from the toner container to the developing device.

  Note that in many conventional image forming apparatuses, a direction parallel to the axial direction of the photosensitive drum or the developing roller is a front-rear direction of the apparatus, and a user stands in front of the apparatus and performs various operations. The developing device described in Patent Document 1 is proposed for this type of image forming apparatus.

JP 7-199623 A

  In recent years, some image forming apparatuses such as small printers have a direction orthogonal to the axial direction of the developing roller as the front-rear direction of the apparatus. In this type of image forming apparatus, from the viewpoint of improving the detachability of the toner container, it is conceivable that the toner container is assembled to the developing device from the front side of the device (a horizontal direction orthogonal to the axial direction of the developing roller). ing.

  In this type of image forming apparatus, the structure of a toner container or the like described in Patent Document 1 cannot be directly applied. In particular, it is difficult to open and close the shutter member on the developing device side by rotating the toner container once stored in the device from the outside of the device. Therefore, another structure is required for opening and closing the shutter member as the toner container is attached and detached.

  The present invention has been made in view of such circumstances, and an image forming apparatus in which a second unit is attached to and detached from a first unit along a direction orthogonal to the axial direction of a rotating member included in the first unit. An object of the present invention is to allow the shutter member provided on the first unit side to be appropriately opened and closed as the second unit is attached to and detached from the first unit.

  In order to solve the above problem, the applicant holds the shutter member on the first unit so that the second unit can be displaced in the assembly direction of the second unit (perpendicular to the axial direction of the rotating member). With the assembly of the second unit, it was considered to push the shutter member in the assembly direction to open the developer supply port. However, it may be difficult to secure a space for driving the shutter member in the assembling direction, such as an image carrier (photosensitive drum) disposed behind the first unit. There is a problem that the size cannot be secured sufficiently. Such a problem is solved by the image forming apparatus of the present invention having the following configuration.

  That is, an image forming apparatus according to an aspect of the present invention includes a first unit including a rotating member, and a second unit that is detachably assembled to the first unit and replenishes the first unit with developer. In the image forming apparatus, the second unit includes a second unit main body having a developer discharge port at a predetermined position, and a second unit side shutter member that opens and closes the developer discharge port, and the shaft of the rotating member Assembling direction to the first unit with the direction orthogonal to the direction as the assembling direction, and the second unit side shutter member is displaced along with the assembling to open the developer discharge port. The first unit accommodates the rotating member and is disposed at an end portion on one side of the intermediate portion of the first unit in the axial direction of the rotating member. A first unit main body provided with a developer replenishing port which is provided at a position and receives the developer from the second unit, and a second unit mounting portion which is disposed in the first unit main body and to which the second unit is assembled. A first position held by the first unit main body so as to be displaceable in a direction parallel to the axial direction of the rotating member and closing the developer supply port, and the one side in the axial direction of the rotating member. A first unit side shutter member which is displaceable over a second position where the developer replenishing port is opened at a position displaced to the opposite side of the end, and the first unit side shutter member An urging member for urging the position of the first unit, and the second unit main body and the first unit side shutter member are assembled in the second unit mounting portion. The at least one contact portion of the contact portions is inclined with respect to the assembly direction as a contact surface with which the other contact portion abuts. A slanting surface that travels, and converts the force by which the second unit is pressed during the assembly process into a force that displaces the first unit side shutter member from the first position to the second position. By forming the oblique surface as described above, each of the contact portions resists the urging force of the urging member as the second unit moves in the assembling direction in the assembling process. The first unit side shutter member is displaced from a first position to a second position.

  In this image forming apparatus, the second unit is assembled to the second unit mounting portion of the first unit along a direction (assembly direction) orthogonal to the axial direction of the rotating member. At this time, when the second unit is moved in the assembling direction, the abutting portion on the second unit side abuts on the abutting portion of the first unit side shutter member, and the first unit side shutter member is orthogonal to the assembling direction. The first position is displaced from the first position along the direction to the second position, whereby the developer replenishing port of the first unit is opened, and the developer can be replenished from the second unit to the first unit. On the other hand, when the second unit is removed, the first unit-side shutter member is returned to the first position by the urging force of the urging member, thereby closing the developer supply port. Therefore, according to this image forming apparatus, the developer supply port can be appropriately opened and closed as the second unit is attached to and detached from the first unit. In addition, since the first unit-side shutter member is displaced in a direction perpendicular to the assembly direction of the second unit, the displacement of the first unit-side shutter member is reduced without being restricted by an image carrier (photosensitive drum) or the like. Therefore, it is possible to secure a relatively large developer supply port.

  In particular, at least one contact portion of the contact portions has an oblique surface, and the second unit is subjected to a second force from the first position during the second unit assembly process. Is converted to a force that displaces the first unit-side shutter member at the position of the first unit, so that the second unit is assembled using a force that is pressed from the outside when the second unit is assembled with a relatively simple configuration. The one-unit shutter member can be displaced. Further, the first unit includes a developer supply port at a position closer to one end than the intermediate portion in the axial direction of the rotating member, and the first unit-side shutter member is disposed on the one side in the axial direction. Since the position displaced to the side opposite to the end portion is the second position, it is possible to secure a larger displacement allowance for the first unit side shutter member. Therefore, it is possible to provide a larger developer replenishing port in the axial direction than in the case where the developer replenishing port is formed at the axially intermediate portion of the rotating member.

  In the image forming apparatus, the second unit-side shutter member is displaced in a direction opposite to the assembly direction as the second unit is assembled to the first unit, whereby the developer discharge port. It is preferable to open the door.

In this case, the first unit main body of the first unit includes a guide portion that guides the second unit in the process of assembling the second unit to the second unit mounting portion.
The guide unit is in contact with the second unit side shutter member of the second unit guided along the guide unit, so that the second unit side shutter member is in a direction opposite to the assembly direction. It is preferable that a protrusion that is displaced to open the developer discharge port is formed.

  The present invention relates to an image forming apparatus in which a second unit is attached to and detached from a first unit along a direction orthogonal to the axial direction of a rotating member included in the first unit, and the first unit provided on the first unit side. The side shutter member can be appropriately opened and closed as the second unit is attached to and detached from the first unit.

1 is a cross-sectional view showing an internal structure of an image forming apparatus according to an embodiment of the present invention. FIG. 3 is a plan view showing a developing device and a toner container incorporated in the image forming apparatus. FIG. 3 is a perspective view of a developing device and a toner container shown in FIG. 2. It is a perspective view of a developing device alone. It is a top view which shows the internal structure of a developing device. FIG. 6 is a perspective view of a toner container alone. FIG. 3 is an enlarged view of a main part of the developing device showing the container mounting portion and the vicinity thereof (a state where the developing shutter plate is in the closed position). FIG. 3 is an enlarged view of a main part of the developing device showing a container mounting portion and the vicinity thereof (a state where the developing shutter plate is in an open position). FIG. 4 is an enlarged view of a main part of the developing device showing a state where the gear holder is in a retracted position. FIG. 4 is an enlarged view of a main part of the developing device and the toner container showing a state in which the toner container is assembled. FIG. 6 is a schematic diagram of the developing device and the toner container showing a process of assembling the toner container to the developing device (displacement state of the developing shutter plate).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an internal structure of an image forming apparatus 1 according to an embodiment of the present invention. Here, a monochrome printer is illustrated as the image forming apparatus 1, but the image forming apparatus may be a copying machine, a facsimile machine, or a multifunction machine having these functions, and an image forming apparatus that forms a color image. It may be.

  The image forming apparatus 1 includes a main body housing 10 having a substantially rectangular parallelepiped housing structure, a paper feeding unit 20, an image forming unit 30, a fixing unit 40, and a toner container 50 (in the present invention) accommodated in the main body housing 10. Corresponding to the second unit).

  A front cover 11 is provided on the front side (right side in FIG. 1) of the main body housing 10, and a rear cover 12 is provided on the rear side. By opening the front cover 11, the user can take out the toner container 50 from the front side of the main body housing 10 when the toner runs out. The rear cover 12 is a cover that is opened at the time of sheet jam or maintenance. The units of the image forming unit 30 and the fixing unit 40 can be taken out from the rear side of the main body housing 10 by opening the rear cover 12. Further, on the upper surface of the main body housing 10, a paper discharge unit 13 for discharging the sheet after image formation is provided.

  The paper feeding unit 20 includes a paper feeding cassette 21 that accommodates a sheet on which image forming processing is performed. The paper feed cassette 21 can be pulled out from the front side of the main body housing 10 in the front direction. The sheet feeding cassette 21 is provided with a sheet accommodating space for accommodating the bundle of sheets, a lift plate for lifting the bundle of sheets for feeding. A sheet feeding portion 21 </ b> A is provided at an upper portion on the rear end side of the sheet feeding cassette 21. In the sheet feeding portion 21A, a pickup roller (not shown) for feeding the uppermost sheet of the sheet bundle in the sheet feeding cassette 21 one by one is disposed.

  The image forming unit 30 performs an image forming process for forming a toner (developer) image on a sheet fed from the paper feeding unit 20. The image forming unit 30 includes a photosensitive drum 31, a charging device 32, an exposure device (not shown in FIG. 1), and a developing device 33 (first unit of the present invention) disposed around the photosensitive drum 31. And a transfer roller 34 and a cleaning device 35.

  The photosensitive drum 31 rotates around its axis, and an electrostatic latent image and a toner image are formed on its peripheral surface. As the photosensitive drum 31, a photosensitive drum using an amorphous silicon (a-Si) material can be used. The charging device 32 uniformly charges the surface of the photosensitive drum 31, and includes a charging roller that contacts the photosensitive drum 31. The exposure apparatus has a laser light source and optical equipment such as a mirror and a lens, and irradiates the peripheral surface of the photosensitive drum 31 with light modulated based on image data given from an external device such as a personal computer. An electrostatic latent image is formed.

  The developing device 33 supplies toner to the peripheral surface of the photosensitive drum 31 in order to develop the electrostatic latent image on the photosensitive drum 31 to form a toner image. The developing device 33 includes a developing roller 331 (corresponding to a rotating member of the present invention) that carries toner to be supplied to the photosensitive drum 31, and a developing housing 60 (see FIGS. 2 to 5; the first unit body of the present invention). A first conveying screw 332 and a second conveying screw 333 that circulate and convey the developer (toner) while stirring the developer (toner). The developing device 33 will be described in detail later.

  The transfer roller 34 is a roller for transferring a toner image formed on the peripheral surface of the photosensitive drum 31 onto a sheet, and forms a transfer nip portion with the photosensitive drum 31. The transfer roller 34 is given a transfer bias having a polarity opposite to that of the toner. The cleaning device 35 has a cleaning roller and the like, and cleans the peripheral surface of the photosensitive drum 31 after the toner image is transferred.

  The fixing unit 40 performs a fixing process for fixing the transferred toner image on the sheet. The fixing unit 40 includes a fixing roller 41 having a heating source therein, and a pressure roller 42 that is pressed against the fixing roller 41 and forms a fixing nip portion with the fixing roller 41. When the sheet on which the toner image has been transferred is passed through the fixing nip portion, the toner image is fixed on the sheet by heating by the fixing roller 41 and pressing by the pressure roller 42.

  The toner container 50 stores toner to be supplied to the developing device 33. The toner container 50 includes a container main body 51 (corresponding to the second unit main body of the present invention) in which toner is stored, and a transport screw 52 that transports the toner stored in the container.

  The container main body 51 includes a toner accommodating portion 51a that mainly stores toner, a cylindrical portion 51b that protrudes from a lower portion of one side surface (the rear surface in FIG. 1) of the toner accommodating portion 51a, and a toner accommodating portion 51a. And a lid member 51c covering the other side surface (see FIG. 6). The conveying screw 52 includes a shaft 521 that extends in the direction in which the toner accommodating portion 51 a and the cylindrical portion 51 b are arranged, and a blade portion 522 that protrudes in a spiral shape on the outer periphery of the shaft 521. The toner stored in the toner container 50 is transported from the toner accommodating portion 51a to the cylindrical portion 51b when the transport screw 52 is driven to rotate, and the toner discharge port 511 provided on the lower surface of the front end of the cylindrical portion 51b. (Corresponding to the developer discharge port of the present invention) is supplied into the developing device 33. The detailed configuration of the toner container 50 will be described in detail later.

  In the main body housing 10, a main conveyance path 22F and a reverse conveyance path 22B are provided to convey the sheet. The main conveyance path 22 </ b> F passes through the image feeding unit 21 and the fixing unit 40 from the sheet feeding unit 21 </ b> A of the paper feeding unit 20, and the paper discharge port 14 provided to face the paper discharge unit 13 on the upper surface of the main body housing 10. It extends to. The reverse conveyance path 22B is a conveyance path for returning a sheet printed on one side to the upstream side of the image forming unit 30 in the main conveyance path 22F when performing duplex printing on the sheet.

  A registration roller pair 23 is disposed in a position upstream of the transfer nip portion between the photosensitive drum 31 and the transfer roller 34 in the main transport path 22F. After the sheet is temporarily stopped by the registration roller pair 23 and skew correction is performed, the sheet is sent out to the transfer nip portion at a predetermined timing for image transfer. A plurality of transport rollers for transporting the sheet are disposed at appropriate positions on the main transport path 22F and the reverse transport path 22B. For example, a pair of paper discharge rollers 24 is disposed in the vicinity of the paper discharge port 14.

  The reverse conveyance path 22 </ b> B is formed between the outer side surface of the reverse unit 25 and the inner surface of the rear cover 12 of the main body housing 10. A transfer roller 34 and one roller of the registration roller pair 23 are mounted on the inner surface of the reversing unit 25. The rear cover 12 and the reversing unit 25 can be rotated about the axis of the fulcrum 121 provided at the lower end thereof. When a sheet jam occurs in the reverse conveyance path 22B, the rear cover 12 is opened. When a sheet jam occurs in the main conveyance path 22F, or when the unit of the photosensitive drum 31 and the developing device 33 are taken out, the reversing unit 25 is opened in addition to the rear cover 12.

  Next, the structures of the developing device 33 and the toner container 50 will be described with reference to FIGS. 2 is a plan view showing the assembled state of the developing device 33 and the toner container 50, FIG. 3 is a perspective view thereof, FIG. 4 is a perspective view of the developing device 33 alone, and FIG. 5 is an internal structure of the developing device 33. FIG. 6 is a perspective view of the toner container alone, FIGS. 7 to 9 are enlarged views of main parts of the developing device 33, and FIG. 10 is a developing device and a toner showing a state in which the toner container is assembled to the developing device. FIG. 11 is a schematic diagram of the developing device and the toner container, showing a process in which the toner container is assembled to the developing device.

  The developing device 33 includes a developing housing 60 having a box shape that is long in one direction (the axial direction of the developing roller 331). The developing housing 60 has an opening extending in the longitudinal direction, and a part of the peripheral surface of the developing roller 331 is exposed from the opening. In the present embodiment, the developing housing 60 is assembled to the main body housing 10 so that the longitudinal direction thereof coincides with the left-right direction of the main body housing 10.

  Referring to FIG. 5, the development housing 60 includes an internal space 600. In the case of the two-component development method, the internal space 600 is filled with a developer composed of toner and carrier. The carrier is agitated and mixed with the toner in the internal space 600 to charge the toner and convey the toner to the developing roller 331. The toner is sequentially supplied to the developing roller 331 and consumed, and the consumed amount is appropriately supplied from the toner container 50.

  The internal space 600 of the developing housing 60 is partitioned into a first passage 602 and a second passage 603 that are long in the left-right direction by a partition plate 601 extending in the left-right direction. The partition plate 601 is shorter than the width in the left-right direction of the developing housing 60, and the first communication portion 604 and the second communication portion that connect the first passage 602 and the second passage 603 to the right end and the left end of the partition plate 601, respectively. 605 is provided. As a result, a circulation path reaching the first passage 602, the first communication portion 604, the second passage 603, and the second communication portion 605 is formed inside the developing housing 60.

  A first conveyance screw 332 is accommodated in the first passage 602, and a second conveyance screw 333 is accommodated in the second passage 603. The first and second conveying screws 332 and 333 each include a shaft and a blade portion projecting in a spiral shape on the outer periphery of the shaft. The first conveying screw 332 is driven to rotate around the shaft to convey the developer in the direction of arrow a in FIG. On the other hand, the second conveying screw 333 is driven to rotate around the shaft, thereby conveying the developer in the direction of arrow b. Accordingly, when the first and second conveying screws 332 and 333 are driven to rotate, the developer is circulated and conveyed along the above-described circulation path.

  4 and 7, the top plate 60T of the developing housing 60 includes a container mounting portion 61 (corresponding to the second unit mounting portion of the present invention) near the left end thereof. The container mounting portion 61 has a toner supply port 60H (corresponding to the developer supply port of the present invention) for receiving the toner supplied from the toner container 50 into the housing. In a state where the toner container 50 is assembled to the portion 61, the toner supply port 60H and the toner discharge port 511 of the toner container 50 are aligned vertically.

  The toner replenishing port 60H is located above the left end of the first passage 602 of the developing housing 60. Accordingly, the toner newly supplied from the toner supply port 60 </ b> H falls into the first passage 602, is mixed with the existing developer, and is conveyed by the first conveying screw 332 in the direction of arrow a. At this time, the toner is stirred with the carrier and charged. Next, the toner enters the second passage 603 from the downstream end of the first passage 602 through the first communication portion 604 and is conveyed in the direction of arrow b by the second conveying screw 333. During this conveyance, the toner is similarly charged, while a part is supplied to the peripheral surface of the developing roller 331. The remaining toner and carrier are returned to the upstream end of the first passage 602 via the second communication portion 605.

  On the top surface of the top plate 60T of the developing housing 60, a developing shutter plate 62 (corresponding to the first unit side shutter member of the present invention) that can slide in the left-right direction is disposed. The developing shutter plate 62 is located at the container mounting portion 61 and covers the toner supply port 60H, thereby closing the toner supply port 60H (the position shown in FIG. 7; corresponding to the first position of the present invention). ) And an open position (position shown in FIGS. 4 and 8; corresponding to the second position of the present invention) that moves rightward from this position and opens the toner supply port 60H. .

  The developing shutter plate 62 includes a guide protrusion 621 that protrudes downward. The guide protrusion 621 is inserted into a slit-shaped guide groove 611 formed in the top plate 60T and extending in the left-right direction. The top plate 60T is formed with ribs 623 extending in the left-right direction and covering a part of the developing shutter plate 62 from above. As a result, the developing shutter plate 62 slides stably in the left-right direction along the guide groove 611 while being pressed from above by the rib 623.

  The developing shutter plate 62 is always urged by an urging spring 625 (corresponding to the urging member of the present invention) so as to be always in the left direction, that is, in the closed position. The urging spring 625 is a coil spring, and each end is attached to a spring seat (not shown) provided on the right edge of the developing shutter plate 62 and the rib 624 adjacent to the developing shutter plate 62.

  On the upper surface of the developing shutter plate 62, an oblique protrusion 622 (corresponding to an abutting portion of the first unit side shutter member in the present invention) that is inclined in an oblique direction with respect to the front-rear direction is projected. The oblique ridge 622 is an external force applied to the oblique ridge 622 from the front side, that is, a pressing force when the toner container 50 is assembled to the developing device 33, ie, a leftward driving force of the developing shutter plate 62, that is, The developing shutter plate 62 is converted into a force that displaces the developing shutter plate 62 from the first position to the second position. In this embodiment, the front surface of the oblique ridge 622 corresponds to the oblique surface of the present invention.

  A guide portion 612 of the toner container 50 is disposed on the left side of the container mounting portion 61 of the developing housing 60. The guide portion 612 guides the toner container 50 when the toner container 50 is assembled to the container mounting portion 61. The guide portion 612 protrudes from the top surface of the top plate 60 </ b> T of the developing housing 60 and extends in the front-rear direction. Consists of.

  On the left side of the guide portion 612, a shaft member 63 for transmitting a rotational driving force from a motor (not shown) to the toner container 50, a gear holder 65, and a biasing spring (not shown) are arranged.

  The shaft member 63 is fixed to a rotating shaft 631 that extends in the front-rear direction and is rotatably supported by a support portion 64 disposed on the top plate 60T, and one end (the front side in FIG. 7) of the rotating shaft 631, A coupling 632 to which a rotational driving force from the motor is applied, and an intermediate gear 633 made of a spur gear fixed to the other end of the rotating shaft 631 are included.

  The gear holder 65 includes a holder main body 652 that is swingably supported by the rotating shaft 631 of the shaft member 63, and a spur gear that is rotatably supported by the holder main body 652 while meshing with the intermediate gear 633. Output gear 651. The gear holder 65 includes a meshing position (position shown in FIG. 7) where the output gear 651 meshes with a container gear 52G, which will be described later, in the toner container 50 assembled to the container mounting portion 61, and the output gear 651 outside (left side) from this position. ) To the retracted position (position shown in FIG. 9). The gear holder 65 is urged by an urging spring so as to be always in the meshing position. This urging spring is a torsion coil spring and is mounted on the rotary shaft 631 at a position between the support portion 64 and the gear holder 65, and both ends thereof are engaged with the support portion 64 and the holder main body 652.

  The transmission gear 651 of the gear holder 65 and the intermediate gear 633 of the shaft member 63 reduce the rotational speed of the rotational driving force applied from the motor to the shaft member 63 to a predetermined rotational speed to be applied to the toner container 50. To do.

  The holder main body 652 of the gear holder 65 is formed with a contact portion 653 with which the toner container 50 contacts when the toner container 50 is attached to the container mounting portion 61. The contact portion 653 generates an external force applied to the contact portion 653 from the front side by rotating the gear holder 65 counterclockwise (counterclockwise when viewed from the front), that is, the gear holder 65 from the meshing position to the retracted position. A contact surface inclined in an oblique direction with respect to the front-rear direction so as to be converted into a displacement force is provided.

  As shown by an arrow A in FIG. 2, the toner container 50 has a toner container 51a and a cylindrical portion 51b aligned in the front-rear direction, as shown by an arrow A in FIG. ) To the developing device 33 from the cylindrical portion 51b side. Accordingly, in a state where the toner container 50 is mounted on the developing device 33, the toner inside the container is supplied to the developing device 33 while being transported from the front side to the rear side as the transport screw 52 rotates.

  A first pressing plate 542 (corresponding to the contact portion of the second unit main body in the present invention) for pressing the developing shutter plate 62 of the developing housing 60 is provided below the leading edge of the cylindrical portion 51b of the toner container 50. A second pressing plate 544 for pressing the holder main body 652 of the gear holder 65 is attached to the left side of the cylindrical portion 51b slightly rearward of the tip. In addition, a container gear 52G made of a spur gear for inputting rotational driving force to the conveying screw 52 is exposed and arranged at the distal end surface of the cylindrical portion 51b. The container gear 52G is disposed on the same axis as the shaft 521 of the conveying screw 52, and is connected to the tip of the shaft 521 so as to be rotatable integrally with the shaft 521.

  When the toner container 50 is attached to the developing device 33, the user inserts the toner container 50 into the image forming apparatus 1 from the front and attaches it to the container mounting portion 61 of the developing housing 60. At this time, the user inserts the protruding portion 613 formed on the guide portion 612 into the groove portion 545 (see FIG. 6) formed on the side portion of the cylindrical portion 51b, and the toner container 50 is predetermined along the guide portion 612. Enter to the assembly position.

  When the cylindrical portion 51b of the toner container 50 enters from the front to the rear with respect to the container mounting portion 61, the cylindrical portion 51b interferes with the gear holder 65 disposed at the meshing position, and the gear holder 65 is moved to the retracted position. (See FIG. 9; the toner container 50 is omitted in FIG. 9). Specifically, the second pressing plate 544 comes into contact with the contact surface of the contact portion 653 from the front, so that the gear holder 65 rotates counterclockwise around the rotation shaft 631 against the urging force of the urging spring. It is turned counterclockwise (when viewed from the front). This avoids interference between the container gear 52G at the tip of the cylindrical portion 51b and the output gear 651 of the developing device 33.

  When the toner container 50 enters a predetermined assembly position, as shown in FIG. 10, the second pressing plate 544 passes through the position of the contact portion 653, so that the contact state is released, and the gear holder 65 returns to the meshing position by the biasing force of the biasing spring. As a result, the output gear 651 meshes with the container gear 52G, and the rotation driving force can be transmitted from the developing device 33 to the toner container 50.

  On the other hand, when the cylindrical portion 51b of the toner container 50 enters from the front to the rear with respect to the container mounting portion 61, the first pressing plate 542 of the toner container 50 interferes with the developing shutter plate 62 disposed at the closed position. Then, the developing shutter plate 62 is moved to the right. Specifically, as shown in FIGS. 11A and 11B, the first pressing plate 542 comes into contact with the skew projecting ridge 623 projecting from the upper surface of the developing shutter plate 62, and the biasing spring 62. The developing shutter plate 61 is pushed rightward against the urging force. When the toner container 50 enters the predetermined assembly position (FIG. 11C), the developing shutter plate 62 reaches the open position and the toner supply port 60H is opened, and the toner supply port 60H. Thus, the toner discharge port 511 of the toner container 50 is opposed to the toner container 50, so that the toner can be supplied from the toner container 50 to the developing device 33. Although not shown, the toner container 50 includes a shutter member (corresponding to the second unit-side shutter member of the present invention) that opens and closes the toner discharge port 511, and is attached when the toner container 50 is attached. As the cylindrical portion 51b of the toner container 50 advances from the front to the rear, the shutter member is pushed forward by the protrusion 613 formed on the guide portion 612, thereby the toner discharge port. 511 is opened.

  On the other hand, when the toner container 50 is removed from the container mounting portion 61, the developing shutter plate 62 is returned to the closed position by the urging force of the urging spring 625, whereby the toner supply port 60H is closed.

  As described above, according to the image forming apparatus 1, when the toner container 50 is attached to or detached from the developing device 33, the toner supply port 60 </ b> H can be opened / closed along with the attachment / detachment. In particular, in the image forming apparatus 1, the toner supply opening 60 </ b> H is generated when the developing shutter plate 62 is displaced in the left-right direction, that is, in a direction orthogonal to the assembly direction of the toner container 50 (a direction parallel to the axial direction of the developing roller 331). Therefore, the amount of displacement of the developing shutter plate 62 is less likely to be restricted than when the developing shutter plate 62 is displaced in the front-rear direction. Specifically, when the developing shutter plate 62 is displaced in the front-rear direction, the amount of displacement of the developing shutter plate 62 is limited by the presence of the photosensitive drum 31, but there is no such limitation. Accordingly, it is possible to secure a large displacement allowance of the developing shutter plate 62, thereby making it possible to smoothly supply the toner from the toner container 50 to the developing device 33 by making the toner supply port 60H relatively large. Is possible.

  In addition, in the image forming apparatus 1, as the toner container 50 is assembled, the first pressing plate 542 assembled to the toner container 50 is brought into contact with the skew projecting ridge 622 formed on the developing housing 60. Since the developing shutter plate 62 is displaced along the guide groove 611 of the developing housing 60, there is an advantage that the above-described effects can be obtained with a very simple configuration.

  The image forming apparatus 1 according to the embodiment of the present invention has been described above. However, the present invention is not limited to this, and for example, the following modified embodiment can be taken.

  (1) In the above-described embodiment, the developing shutter plate 62 moves when the first pressing plate 542 of the toner container 50 abuts on the oblique protrusion 622 formed on the developing shutter plate 62. The end surface (left end surface) itself may be a slanted surface inclined with respect to the front-rear direction, and the first pressing plate 542 of the toner container 50 may be in contact with the slanted surface.

  Further, a first pressing plate 542 having a skew surface corresponding to the skew projecting ridge 622 (parallel to the skew projecting strip 622) is attached, and the skew projecting strip 622 and the first pressing plate 542 are provided. It is good also as a structure which carries out surface contact. According to this configuration, the first pressing plate 542 can be displaced more smoothly while pressing the oblique protrusion 622 more smoothly.

  Further, the relationship between the developing shutter plate 62 and the toner container 50 in the above embodiment may be reversed. That is, the developing shutter plate 62 is applied with, for example, a shaft-shaped protrusion instead of the skew projection 622, while the first pressing plate 542 has a skew surface inclined with respect to the front-rear direction. The developer shutter plate 62 is displaced by bringing the inclined surface of the first pressing plate 542 and the shaft-like protrusion of the developing shutter plate 62 into contact with each other.

  (2) In the embodiment described above, the developing shutter plate 62 is held by the developing housing 60 so as to be movable in the left-right direction, and then the toner container 50 is applied to the oblique ridges 622 formed on the developing shutter plate 62. The toner replenishing port 60H is opened by the contact of the first pressing plate 542, but the mechanism for opening and closing the toner replenishing port 60H is configured to change the movement of the toner container 50 in the front-rear direction and the lateral direction of the developing shutter plate 62. Any mechanism other than the above embodiment may be used as long as it can be converted into motion.

  (3) In the above embodiment, the toner replenishing port 60H is formed at a position near the left end of the developing device 33, and the developing shutter plate 62 is displaced toward the right side of the developing device 33 to open and close the toner replenishing port 60H. However, the toner replenishing port 60 </ b> H may be provided in an intermediate portion in the left-right direction of the developing device 33. However, as in the above-described embodiment, the toner supply port 60H is provided at a position closer to one end (left end) than the middle portion in the left-right direction in the developing device 33, and the developing shutter plate 62 is connected to the other end. Since the displacement of the developing shutter plate 62 can be ensured to be larger according to the configuration that is displaced toward the portion (right end portion), compared with the case where the toner replenishing port 60H is provided in the intermediate portion in the left-right direction. There is an advantage that the toner replenishing port 60H can be provided larger in the left-right direction.

  (4) In the above-described embodiment, the toner container 50 is attached to the developing device 33 and has a shape elongated in the front-rear direction. The toner screw 50 is provided in the toner discharge port 511 by the transport screw 52 disposed in the front-rear direction. Although the toner is conveyed, the specific configuration of the toner container is not limited to this. For example, the container main body includes a container main body that extends in parallel with the developing roller, and a conveying screw that is disposed in the container main body and extends in the longitudinal direction of the container main body. The toner may be guided to a toner discharge port formed at a specific position in the longitudinal direction.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Main body housing 20 Paper feeding part 30 Image forming part 40 Fixing part 50 Toner container 542 1st press plate 544 2nd press plate 60 Developing housing 60H Toner replenishing port 62 Developing shutter plate 622 Skew ridge

Claims (3)

An image forming apparatus including a first unit including a rotating member, and a second unit removably assembled to the first unit and replenishing the first unit with developer.
The second unit includes a second unit main body having a developer discharge port at a predetermined position, and a second unit side shutter member that opens and closes the developer discharge port, and a direction orthogonal to the axial direction of the rotating member. Is assembled to the first unit along the assembly direction as the assembly direction, and the second unit side shutter member is displaced along with the assembly to open the developer discharge port,
The first unit accommodates the rotating member, and is provided at a position closer to an end portion on one side than an intermediate portion of the first unit in the axial direction of the rotating member and is developed from the second unit. A first unit main body provided with a developer replenishing port for receiving the developer, a second unit mounting portion which is disposed in the first unit main body and to which the second unit is assembled, and is displaced in a direction parallel to the axial direction of the rotating member. The first position held by the first unit main body and closing the developer replenishing port so as to be possible, and the position displaced to the opposite side from the one end in the axial direction of the rotating member, A first unit-side shutter member that is displaceable over a second position that opens the developer supply port, and a biasing member that biases the first unit-side shutter member toward the first position. , Equipped with a,
The second unit main body and the first unit side shutter member respectively include contact portions that contact each other in the process of assembling the second unit to the second unit mounting portion.
At least one of the contact portions includes a contact surface that is inclined with respect to the assembly direction as a contact surface with which the other contact portion contacts, and in the assembly process, The oblique surface is formed so as to convert a force of pressing the second unit into a force of displacing the first unit side shutter member from the first position to the second position. Each abutting portion moves the first unit-side shutter member from the first position against the urging force of the urging member as the second unit moves in the assembling direction in the assembling process. 2. An image forming apparatus that is displaced to the position of 2. The image forming apparatus according to claim 1.
The second unit side shutter member opens the developer discharge port by being displaced in a direction opposite to the assembly direction as the second unit is assembled to the first unit. Image forming apparatus. The image forming apparatus according to claim 2.
The first unit main body of the first unit includes a guide portion for guiding the second unit in the process of assembling the second unit to the second unit mounting portion,
The guide unit is in contact with the second unit side shutter member of the second unit guided along the guide unit, so that the second unit side shutter member is in a direction opposite to the assembly direction. An image forming apparatus characterized in that a protrusion is formed to displace and open the developer discharge port.

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