Patent Application
20210026296
This application is based on and claims the benefit of priority from Japanese Patent application No. 2019-134816 filed on Jul. 22, 2019, which is incorporated by reference in its entirety.
The present disclosure relates to an attachment and detachment structure of a toner container and an image forming apparatus.
A toner bottle may be provided with a powder loosening means which applies external force to a toner to loosen the toner when it is attached to a tonner replenishment device. The toner loosening means is formed by a flexible member provided near a discharge port of a toner discharge path. With the attachment operation of the toner bottle, the flexible member is deformed to loosen the toner near the discharge port.
The above toner bottle has a problem in which its strength is decreased because a part of the toner discharge path is formed by the flexible member.
In accordance with one aspect of the present disclosure, an attachment and detachment structure attaches and detaches a toner container to and from an attachment unit. The toner container includes a container main body, a rotational member and a power transmission body. The container main body contains a toner. The rotational member rotates around an axis to agitate the toner contained in the container main body. The power transmission body is provided outside the container main body and rotates around an axis to transmit a rotational force to the rotational member. The attachment unit includes a contact body which comes into contact with the power transmission body on attachment process and detachment process of the toner container to and from the attachment unit and rotates the power transmission body. The power transmission body comes into contact with the contact body on the attachment process of the toner container to the attachment unit, and is rotated around the axis to rotate the rotational member around the axis.
In accordance with one aspect of the present disclosure, an image forming apparatus includes the attachment and detachment structure of the toner container to and from the attachment unit, and an image forming part which forms an image using the toner contained in the toner container.
The above and other objects, features, and advantages of the present disclosure will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present disclosure is shown by way of illustrative example.
Hereinafter, with reference to the attached drawings, the embodiment of the present disclosure will be described. “Fr”, “Rr”, “L”, “R”, “U” and “D” marked in each figure respectively show “front”, “rear”, “left”, “right”, “upper” and “lower”. In the specification, although terms showing direction and position are used, these terms are used for convenience of description, and do not limit the technical scope of the present disclosure.
[Outline of printer] With reference to
The printer 1 includes an apparatus main body 2 constituting an approximately parallelepiped outer appearance. In the lower portion of the apparatus main body 2, a sheet feeding cassette 3 storing a paper sheet is detachably provided. On the upper face of the apparatus main body 2, a discharge tray 4 is provided. The sheet S is not limited to the paper sheet, but may be a resin sheet or the others.
The printer 1 includes a sheet feeding device 5, an image forming unit 6 and a fixing device 7 which are provided in the apparatus main body 2. The sheet feeding device 5 is provided at the upstream end portion of a conveyance path 8 extending from the sheet feeding cassette 3 to the discharge tray 4. The fixing device 7 is provided on the downstream portion the conveyance path 8, and the image forming unit 6 is provided on the conveyance path 8 between the sheet feeding device 5 and the fixing device 7.
The image forming unit 6 includes a photosensitive drum 10, a charging device 11, a development device 12, a toner container 13, a transferring roller 14, a cleaning device 15 and an optical scanning unit 16. The charging device 11, the development device 12, the transferring roller 14 and the cleaning device 15 are disposed around the photosensitive drum 10 in a transferring process (refer to the arrow X).
The photosensitive drum 10 is formed into a cylindrical shape long in the left-and-right direction, and coupled with a drive motor (not shown) via a gear train. The charging device 11 has a charging roller (not shown) which rotates around an axis while coming into contact with the photosensitive drum 10 to charge the surface of the photosensitive drum 10 (a contact charging type).
The development device 12 has a development roller 12A (not shown) facing the photosensitive drum 10 with an interval. The development roller 12A is applied with development vias from a power source (not shown), and supplies a toner on the photosensitive drum 10 while rotating around an axis. The toner container 13 is detachably attached to the front portion of the upper face of the development device 12. The toner container 13 contains the black toner, for example, and the toner is replenished from the toner container 13 to the development device 12. The toner may be a two-component developer containing the toner and a carrier or a one-component developer containing a magnetic toner.
The transferring roller 14 comes into pressure-contact with the photosensitive drum 10 with predetermined pressure, and presses the sheet conveyed along the conveyance path 8 on the photosensitive drum 10. The cleaning device 15 brings a blade 15A contact with the surface of the photosensitive drum 10 to remove the toner remaining on the surface of the photosensitive drum 10.
The optical scanning unit 16 emits scanning light on the photosensitive drum 10, and forms an electrostatic latent image on the surface of the charged photosensitive drum 10.
[Image forming processing] An operation of the printer 1 will be described. A controller (not shown) of the printer 1 controls each device suitably to perform an image forming processing as follows. The charging device 11 charges the surface of the photosensitive drum 10 at a predetermined potential. The photosensitive drum 10 receives the scanning light (refer to the arrow P in
[Attachment and detachment structure of toner container] Next, with reference to
As shown in
The attachment and detachment structure 17 includes the toner container 13 and the development device 12.
<Toner container> As shown in
(Container main body) The container main body 20 is made of synthetic resin, for example, and formed into an approximately parallelepiped shape (a hollow box-like shape) long in the left-and-right direction. The container main body 20 has a storage part 20A formed into a box-like shape whose upper face is opened, and a lid part 20B closing the upper opened face of the storage part 20A. The container main body 20 contains the toner.
The right rear portion of the container main body (the storage part 20A) is formed into an approximately cylindrical shape, and on the lower face of the cylindrical right rear portion, a discharge port 24 through which the toner is discharged is formed. In the cylindrical right rear portion, an approximately cylindrical shutter 25 is provided so as to be rotatable around an axis. The shutter 25 is rotated in one direction to open the discharge port 24 while it is rotated in the other direction to close the discharge port 24. The shutter 25 is operated using a lever by a user (operator) (the operation is not described).
(Conveyance screw) As shown in
(Agitation member) As shown in
The agitation shaft 22A is made of synthetic resin, for example, and formed into an approximately rod-like shape long in the left-and-right direction. Both the left and right end portions of the agitation shaft 22A are each formed into an approximately rod-like shape thinner than the center portion, and are rotatably supported by the left and right side walls of the storage part 20A. In detail, the right end portion of the agitation shaft 22A is supported by the right side wall of the storage part 20A via the ratchet structure 23 described later. The right end portion of the agitation shaft 22A penetrates the right side wall of the storage part 20A and protrudes rightward. To the right end portion of the agitation shaft 22A protruding outside the container main body 20 (the storage part 20A), an agitation gear 35 (a power transmission body) is provided. The agitation blade 22B is a film made of synthetic resin, for example, and formed into an approximately rectangular shape. The base end portion of the agitation blade 22B is fixed to the agitation shaft 22A, and the agitation blade 22B extends outwardly in the radial direction from the agitation shaft 22A. The agitation blade 22B has a plurality of slits from its tip edge toward the base end. The agitation member 22 is rotated around an axis and has a function to agitate the toner contained in the container main body 20.
(Ratchet mechanism) As shown in
(First cylindrical member) The first cylindrical member 30 is made of synthetic resin or metal, for example, and formed into an approximately cylindrical shape. The first cylindrical member 30 is provided so as to cover the circumferential face of the right end portion of the agitation shaft 22A, and rotatably supported by the right side wall of the container main body 20. The first cylindrical member 30 has a first through hole 30A through which the right end portion of the agitation shaft 22A is passed (refer to
On the right end face (a face facing the second cylindrical member 31) of the first cylindrical member 30, a plurality of first claw parts 34 is provided side by side in the rotational direction. Each first claw part 34 is a projection inclined in one direction of the rotational direction, and has an upright face 34A parallel to the axial direction on one side of the rotational direction and an inclined face 34B crossing to the axial direction on the other side of the rotational direction (refer to
(Second cylindrical member) The second cylindrical member 31 is made of synthetic resin or metal, for example, and formed into an approximately cylindrical shape. The second cylindrical member 31 is provided so as to cover the circumferential face of the right end portion of the agitation shaft 22A protruding outside the container main body 20, and disposed on a right side of the first cylindrical member 30. The second cylindrical member 31 has a second through hole 31A through which the right end portion of the agitation shaft 22A is passed (refer to
Around the outer circumferential face of the second cylindrical member 31, the agitation gear 35 is formed integrally. The agitation gear 35 is a so-called spur gear, and provided on the same axis as the second cylindrical member 31.
On the left end face (a face facing the first cylindrical member 30) of the second cylindrical member 31, a plurality of second claw parts 36 is provided side by side in the rotational direction. Each second claw part 36 is a projection inclined in one direction of the rotational direction, and has an upright face 36A parallel to the axial direction on one side of the rotational direction and an inclined face 36B crossing to the axial direction on the other side of the rotational direction (refer to
(Pressing spring) The pressing spring 32 is a compression spring, and disposed between the right step part 22C of the agitation shaft 22A and the left end face of the first cylindrical member 30. The pressing member 32 has a function to bias the first cylindrical member 30 to the second cylindrical member 31.
<Development device> As shown in
At the right end of the front end portion of the attachment part 41 of the development device 12, a rack 43 (a contact body) is provided in an upright posture. A plurality of teeth of the rack 43 faces rearward (to a side of the attachment part 41). The rack 43 is provided so as to be engaged with (come into contact with) the agitation gear 35 on the attachment and detachment process of the toner container 13 to the development device 12 (the attachment part 41).
[Attachment and detachment of toner container] Next, as shown in
<Attachment of toner container> The toner container 13 is attached to the attachment part 41 when a new printer 1 is firstly used. Alternatively, the toner container 13 is replaced with a used toner container when it is empty (an amount of the toner remaining in the toner container becomes small). By the way, the toner contained in the container main body 20 of the toner container 13 may be solidified owing to its gravity or vibration at transporting (in detail, the toner is not solidified completely and aggregated to form a block of the toner in many cases). If the toner container 13 containing the solidified toner is attached to the attachment part 41 and then the conveyance screw 21 and the agitation member 22 are driven, the solidified toner obstructs the rotation of the conveyance screw 21 and the others. This increases torque of the conveyance screw 21 and the others abnormally, and it becomes difficult to replenish a predetermined amount of the toner to the development device 12. Then, the attachment and detachment structure 17 of the toner container 13 according to the present embodiment is configured to loosen the toner contained in the container main body 20 during the attachment process of the toner container 13 to the development device 12, that is, before the attachment of the toner container 13 is completed.
Firstly, an operator detaches the exterior cover from the apparatus main body 2 (the discharge tray 4) (refer to
The ratchet mechanism 23 connects the agitation gear 35 to the agitation member 22 on the attachment process of the toner container 13 to the attachment part 41 of the development device 12. Specifically, as shown in
As described above, on the attachment process of the toner container 13 to the development device 12, the agitation member 22 is rotated to loosen the toner solidified in the container main body 20.
When the toner container 13 is placed (attached) to the attachment part 41, the driving gear 26 is coupled with a driving source M via a driving force transmission mechanism containing a gear train and the others (not shown). In the state where the toner container 13 is attached to the attachment part 41, the agitation gear 35 is separated away from the rack 43 and coupled with the driving gear 26 via a coupling transmission mechanism containing a gear train and the others (not shown). That is, the agitation gear 35 is indirectly coupled with the driving source M. Furthermore, the shutter 25 of the toner container 13 faces the replenishment port 42 of the attachment part 41. Next, the operator operates the lever to open the shutter 25 to communicate the discharge port 24 with the replenishment port 42.
In the above described manner, the attachment of the toner container 13 to the attachment part 41 of the development device 12 is completed. In this state, the toner contained in the container main body 20 is loosened so that it becomes possible to replenish the toner from the toner container 13 to the development device 12 smoothly.
<Detachment of the toner container> Next, a case where the toner container 13 is detached (separated) from the development device 12, such as a case where the empty toner container 13 in which the toner is consumed is replaced, will be described.
Firstly, the operator detaches the exterior cover from the apparatus main body 2 to expose the toner container 13 attached to the attachment part 41 of the development device 12. Next, the operator operates the lever so as to close the discharge port 24 by the shutter 25. After that, when the operator pulls up the toner container 13, the driving gear 26 is separated away from the driving force transmission mechanism, the agitation gear 35 is separated away from the coupling transmission mechanism and then engaged with the rack 43. When the operator further pulls up the toner container 13, as shown by the dotted line arrow in
The ratchet mechanism 23 separates the agitation gear 35 from the agitation member 22 on the detachment process of the toner container 13 from the attachment part 41 of the development device 12. Specifically, when the agitation gear 35 is rotated in an opposite direction to the rotational direction at the attachment process, each second claw part 36 of the second cylindrical member 31 is slid on the inclined face 34B of each first claw part 34 while pushing the first cylindrical member 30 against the biasing force of the pressing spring 32 (refer to
When the toner container 13 is drawn out from the attachment part 41 completely, the agitation gear 35 is separated away from the rack 43. In the above described manner, the detachment of the toner container 13 from the attachment part 41 of the development device 12 is completed.
The attachment and detachment structure 17 of the toner container 13 according to the above described present embodiment is configured such that the agitation gear 35 is rotated around the axis while engaging with the rack 43 (while the driving force transmission body coming into contact with the contact body) on the attachment process of the toner container 13 to the development device 12. According to the configuration, it becomes possible to rotate the agitation member 22 connected to the agitation gear 35 as the toner container 13 is attached. Thereby, it becomes possible to loosen the solidified toner before the attachment of the toner container 13 to the development device 12 is completed.
According to the attachment and detachment structure 17 of the toner container 13 according to the present embodiment, because the ratchet mechanism 23 connects the agitation gear 35 to the agitation member 22 only at the attachment of the toner container 13, it becomes possible to rotate the agitation member 22 and to loosen the toner as the toner container 13 is attached.
Furthermore, because the ratchet mechanism 23 separates the agitation gear 35 away from the agitation member 22 at the detachment of the toner container 13, the rotational torque of the agitation member 22 is not transmitted to the agitation gear 35 at the detachment of the toner container 13. Then, the operator can detach the toner container 13 smoothly with small force (improvement of workability).
The attachment and detachment structure 17 of the toner container 13 according to the present embodiment is configured such that the agitation gear 35 has a function to be indirectly connected to the driving gear 26 after the attachment of the toner container 13 and also a function to be engaged with the rack 43 on the attachment process of the toner container 13. In the above manner, the agitation gear 35 is used for the two purposes. Thereby, because it is not required to provide the gear to be engaged with the driving gear 26 separately from the agitation gear 35 to be engaged with the rack 43, it becomes possible to make the attachment and detachment structure 17 simple and to reduce the manufacturing cost.
According to the attachment and detachment structure 17 of the toner container 13 according to the present embodiment, using the agitation gear 35 and the rack 43 makes it possible to change the movement of the toner container 13 along the attachment and detachment direction (the upper-and-lower direction) into the rotational movement of the agitation gear 35 (the rotational member) effectively.
The above described attachment and detachment structure 17 of the toner container 13 according to the present embodiment employs the agitation gear 35 as a driving force transmission body and the rack 43 as an example of the contact body, but the present disclosure is not limited thereto. As shown in
In the attachment and detachment structure 17 of the toner container 13 according to the present embodiment (containing the modified example, hereinafter the same), the ratchet mechanism 23 is provided such that the agitation gear 35 and the roller 50 (hereinafter, called the agitation gear 35 and the others) are connected to the agitation member 22 only at the attachment of the toner container 13, but the present disclosure is not limited thereto. For example, the ratchet mechanism 23 may be omitted (not provided) (the example is not shown). In this case, the agitation gear 35 and the others are rotated around the axes while coming into contact with the rack 43 or the frictional plate 51 (hereinafter, called the rack 43 and the others) on the attachment and detachment process (both the attachment process and the detachment process) of the toner container 13 to the development device 12.
In the attachment and detachment structure 17 of the toner container 13 according to the present embodiment, the agitation gear 35 and the others are indirectly coupled with the driving source M via the coupling transmission mechanism and the driving gear 26, but the present disclosure is not limited thereto. The agitation gear 35 and the others may be directly coupled with the driving source M (the example is not shown).
In the attachment and detachment structure 17 of the toner container 13 according to the present embodiment, the development device 12 is shown as an example of the attachment unit, but the present disclosure is not limited thereto. A special attachment unit for attaching the toner container 13 may be provided between the toner container 13 and the development device 12 (the example is not shown).
In the attachment and detachment structure 17 of the toner container 13 according to the present embodiment, the agitation member 22 is shown as an example of the rotational member, but the present disclosure is not limited thereto. For example, as another example of the rotational member, the conveyance screw 21 may be employed, and as another example of the power transmission body, the driving gear 26 may be employed. That is, the driving gear 26 may be rotated while engaging with the rack 43 to rotate the conveyance screw 21. In this case, the ratchet mechanism 23 may be preferably provided between the conveyance screw 21 and the driving gear 26 (the example is not shown). Furthermore, one of the driving gear 26, and the agitation gear 35 and the others may come into contact with the rack 43 and the others, and both the agitation member 22 and the conveyance screw 21 may be rotated (the example is not shown).
It should be noted that the description of the above embodiment shows one aspect of the attachment and detachment structure of the toner container and the image forming apparatus according to the present disclosure, and the technical scope of the present disclosure is not limited to the above embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-134816 | Jul 2019 | JP | national |
