CN211015028U

CN211015028U - Processing box

Info

Publication number: CN211015028U
Application number: CN201921226359.5U
Authority: CN
Inventors: 胡飞; 胡亮亮; 敖仕平; 郭卫东; 顾海丰
Original assignee: Jiangxi Yibo Electronic Technology Co Ltd
Current assignee: Jiangxi Yibo Electronic Technology Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-07-14
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses a processing box, detachable install to image forming device in, image forming device contains the drive shaft that has the concave part, processing box includes: a photosensitive drum; a frame supporting the photosensitive drum; the driving assembly is arranged at the axial tail end of the photosensitive drum and is used for being meshed with the driving shaft to receive driving force and drive the photosensitive drum to rotate; the drive assembly includes a flange and a power receiving portion accessible to the recess, the power receiving portion being capable of forcing the drive shaft to deflect during installation of the cartridge to the image forming apparatus, and a positioning member movable relative to the flange at least in an axial direction of the flange, the positioning member being configured to resist a tendency of the drive shaft to deflect axially.

Description

Processing box

Technical Field

The present invention relates to a driving force transmission mechanism used in an image forming apparatus and a process cartridge including the driving force transmission mechanism.

Background

The process cartridge is a cartridge detachably mountable to a main body of the image forming apparatus, and the cartridge includes, as an integral unit, an electrophotographic photosensitive member and at least one of processors such as a charger, a developer, a cleaner, and the like. Since the process cartridge is detachably mounted with respect to the image forming apparatus main body, maintenance of the apparatus is facilitated. An electronic image forming apparatus employing an electrophotographic image forming method is operated as follows: the charger is uniformly charged by light of the image forming apparatus, selective exposure is performed on the electrophotographic photosensitive member to form an electrostatic latent image, the latent image is developed with toner by a developer to form a toner image, and the formed toner image is transferred onto a recording medium by a transfer device to form an image on the recording material.

In the prior art, for example, taiwan patent publication No. TW201633019A, discloses a process cartridge, including a driving assembly, the drive assembly is used for driving the photosensitive drum arranged in the processing box to rotate, a drive shaft is arranged in the image forming device, the drive shaft having a recess disposed circumferentially thereon, the drive assembly having a flange engageable with the drive shaft to receive a driving force, the flange is provided with an engaging part which can enter the notch, the engaging part is supported by an elastically deformable supporting part, the supporting part is connected with the engaging part and the main body part of the flange, when the process cartridge is mounted in the image forming apparatus, the front end of the drive shaft presses the engaging portion to deform the supporting portion so that the front end of the drive shaft can pass over the engaging portion, when the process cartridge is mounted to a predetermined position, the engaging portion is pushed into the notch of the driving shaft by elastic potential energy accumulated after elastic deformation of the supporting portion to engage with the notch, thereby realizing transmission of driving force. However, since the support portion supporting the engagement portion needs to have elasticity and be thin in thickness, the engagement portion may be broken when transmitting the driving force to the main body portion of the flange, resulting in a case where the driving force cannot be transmitted.

In order to solve the problem that the supporting portion is thin and easy to break, chinese patent publication No. CN208239812U discloses a process cartridge, wherein the engaging portion is directly fixed on the flange main body or on the inner supporting member located inside the flange, the driving shaft is inclined with respect to the axial direction, when the process cartridge is installed in the image forming apparatus, the driving shaft is urged by the engaging portion to incline the driving shaft with respect to the rotation axis thereof by a certain angle to avoid the interference between the front end of the driving shaft and the engaging portion, the structure can solve the problem that the supporting portion is easy to break, in order to prevent the driving shaft from deflecting due to uneven force applied to the engaging portion during the rotation of the driving flange, an elastic urging portion opposite to the engaging portion is added to urge the driving shaft, but the elastic urging portion needs to urge by elastic force, there is a possibility that the urging effect is not ideal, and in addition, the elastic urging portion may increase the difficulty of the deflection of the driving shaft during the mounting and taking out of the process cartridge, causing inconvenience to the mounting and taking out of the process cartridge.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem above in the prior art, the utility model discloses a realize through following technical scheme: a process cartridge detachably mountable to an image forming apparatus including a drive shaft having a recess, comprising:

a photosensitive drum;

a frame supporting the photosensitive drum;

the driving assembly is arranged at the axial tail end of the photosensitive drum and is used for being meshed with the driving shaft to receive driving force and drive the photosensitive drum to rotate;

the drive assembly includes a flange and a power receiving portion accessible to the recess, the power receiving portion being capable of forcing the drive shaft to deflect during installation of the cartridge to the image forming apparatus, and a positioning member movable relative to the flange at least in an axial direction of the flange, the positioning member being configured to resist a tendency of the drive shaft to deflect axially.

Further, the drive shaft includes a front end portion at a front end and a circumferential surface adjoining the front end portion, and the positioning member has an overlapping area with the circumferential surface in the axial direction of the flange after the drive shaft is engaged with the power receiving portion.

Further, the driving assembly further includes a bottom cover covering the flange, and an elastic member is disposed between the positioning member and the bottom cover.

Further, the positioning member includes a positioning recess having a cylindrical recess.

Further, the flange is provided with a positioning member restricting portion that restricts a movement stroke of the positioning member in the axial direction of the flange.

Further, during mounting of the process cartridge to the image forming apparatus, the drive shaft contacts the positioning member and urges the positioning member to move in a direction opposite to the mounting direction of the process cartridge.

Furthermore, the power receiving part is provided with a positioning concave part which can be sleeved in at least one part of the driving shaft, and after the driving shaft is meshed with the power receiving part, the elastic component pushes the positioning concave part to be sleeved in one part of the front end of the driving shaft.

Further, the flange device also comprises a bottom cover covering the flange, and a positioning member deflection limiting part for limiting the movement of the positioning member in the axial direction perpendicular to the flange is arranged on the bottom cover or the flange.

Further, the engaging portion of the power receiving portion into the recess may be movable by a stroke in the axial direction of the flange relative to the recess during the process cartridge is taken out from the image forming apparatus.

Further, the drive shaft includes a front end portion at a front end and a circumferential surface adjoining the front end portion, the positioning member has an overlapping area m with the circumferential surface in the axial direction of the flange after the drive shaft is engaged with the power receiving portion, and the engaging portion of the power receiving portion entering the recess is movable relative to the recess by a distance n in the axial direction of the flange during the process cartridge is taken out from the image forming apparatus, the length of n being equal to or greater than the length of m as measured in the axial direction of the flange.

After adopting above technical scheme, through adopting the locating component card to go into the partly problem of solving the beat of drive shaft drive flange rotation in-process that solves drive shaft drive flange bottom, because the locating component has adopted the structure ring cover of whole ring cover to cover in the drive shaft, the problem of drive shaft beat that can be fine, in addition, the locating component adopts flexible structure, can not exert the power that stops its beat to the drive shaft at the in-process that handles the box and take out for it is more smooth and easy to handle the installation of box and take out.

Description of the drawings:

FIG. 1 is a schematic configuration diagram of a drive shaft of an image forming apparatus;

FIG. 2 is a schematic view of the overall structure of the process cartridge of the present invention;

FIG. 3 is a schematic view of a drive assembly of the present invention in preparation for engagement with a drive shaft of an image forming apparatus;

fig. 4 is an exploded view of the driving assembly of the present invention;

fig. 5 is a schematic top view of the flange according to the present invention;

fig. 6 is a cross-sectional view of the drive assembly of the present invention in the axial direction;

FIG. 7 is a schematic structural view of a recess portion of a drive shaft in the image forming apparatus;

FIG. 8 is a first process schematic of the present invention in which a drive assembly engages a drive shaft of an image forming apparatus;

FIG. 9 is a second process schematic of the present invention in which the drive assembly engages the drive shaft of the image forming apparatus;

fig. 10 is a schematic view illustrating a process of disengaging the driving unit from the driving shaft of the image forming apparatus according to the present invention.

The specific implementation mode is as follows:

in order to make the purpose of the embodiment of the present invention, the technical solution and the technical effect are clearer, and the following description will be made in conjunction with the accompanying drawings to clearly and completely describe the technical solution of the developing cartridge of the present invention. It should be understood that the described embodiment is only a preferred embodiment of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts are included in the protection scope of the present invention.

As shown in fig. 1, a schematic view of a driving shaft 100 of the image forming apparatus is shown. The drive shaft 100 is substantially cylindrical, and three recesses 100b (only one is shown) are uniformly distributed on the circumferential surface of the drive shaft 100, and a front end portion 100a is further provided at the front end of the drive shaft 100, the front end portion 100a having a round head shape without a notch formed thereon. One end of the driving shaft 100 is connected to a spring 101, and the driving shaft 100 can axially extend toward a1 direction or retract toward a2 direction under the elastic force of the spring 101. The drive shaft 100 has a certain clearance h from the image forming apparatus frame in the direction crossing the axial direction, and when the drive shaft 100 receives an external force in the direction crossing the axial direction, the rotational axis of the drive shaft 100 may be inclined with respect to the rotational axis thereof at a preset position, which is a position at which the drive shaft 100 is free from the external force and is naturally ejected by the spring 101.

As shown in fig. 2, the process cartridge 1 of the present embodiment includes: a frame 2 having a developer accommodating portion for storing a developer; a photosensitive drum 15 rotatably supported on the housing 2; and the driving component 3 is arranged at one axial tail end of the photosensitive drum 15 and is used for receiving the driving force transmitted by the driving shaft of the image forming device and driving the photosensitive drum 15 to rotate.

As shown in fig. 3-6, the drive assembly in this embodiment includes a positioning member 8 for positioning the drive shaft 100. The positioning member 8 is movably provided in the drive assembly, and preferably, the positioning member 8 is provided between the flange 301 and the bottom cover 7, an elastic member 9 is provided between the bottom cover 7 and the positioning member 8, the elastic member 9 is preferably a compression spring, a positioning concave portion 801 is provided on the positioning member 8, the positioning member 8 is provided at a position closer to the inner side of the photosensitive drum 15 (see fig. 2) than the power receiving portion 45 in the axial direction of the flange, a positioning member restricting portion 310 is provided on the flange 301, the positioning member restricting portion 310 protrudes in the axial direction of the flange 301 for preventing a problem of difficult machine taking caused by the positioning member 8 being too close to the power receiving portion 45 in the axial direction by contacting the positioning member 8 to restrict the position of the positioning member 8 in the axial direction of the flange, which will be described later. The power receiving portion 45 is fixedly disposed in the flange 301, and preferably, in order to enhance the bonding strength between the power receiving portion 45 and the flange 301, the power receiving portion 45 and the flange 301 may be integrally formed, and a driving shaft accommodating portion W for providing a swing space for the driving shaft 100 and accommodating the swung driving shaft 100 is disposed at a position of the flange 301 opposite to the power receiving portion 45. When the drive assembly of the present embodiment is mounted, the positioning member 8 is placed on the positioning member restricting portion 310, then the elastic member 9 is placed on the restricting member 8, and finally the bottom cover 7 is covered on the elastic member 9 and the bottom cover 7 is snapped into the flange 301 to complete the mounting of the drive assembly. The positioning member 8 is movable relative to the flange 301 at least in the axial direction of the flange 301 under the elastic force of the elastic member 9, and preferably, the elastic member 9 is configured to urge the positioning member 8 to move in the axial direction of the flange 301, but not limited thereto, and the technical effect of the present embodiment can be achieved even if the positioning member 8 moves in a direction forming an angle with the axial direction of the flange 301. The bottom cover 7 is provided with a positioning member deflection preventing limiting portion 710 for limiting the movement of the positioning member 7 in the direction perpendicular to the axial direction of the flange 301, and preferably, the limiting member deflection preventing limiting portion 710 is configured as an inner circumferential surface of the bottom cover 7, and the movement of the positioning member 7 in the direction perpendicular to the axial direction of the flange 301 is limited by the contact between the inner circumferential surface of the bottom cover 7 and the outer circumferential surface of the positioning member 8, but not limited thereto, and a protrusion may be protruded in the axial direction of the flange 301 to contact with the positioning member 8 to limit the movement of the positioning member 8 in the direction perpendicular to the axial direction of the flange 301, as long as the structure for limiting the movement of the positioning member 8 in the direction perpendicular to the axial direction of the flange 301 is realized. As shown in fig. 6 and 7, the recess 100b of the drive shaft 100 of the image forming apparatus has a drive surface 100b1 and a disengaging guide slope 100b2, and is a front end portion 100a of a circular arc shape at the front end, a circumferential surface 100c at a position where the drive shaft 100 abuts the front end portion 100a has an extending direction substantially parallel to the axis of the drive shaft and an extending direction substantially parallel to the axis of the drive shaft, and the positioning recess 801 of the positioning portion 8 has a swing restricting portion 801a engageable with the circumferential surface 100c, preferably the swing restricting portion 801a is configured as a cylindrical notch, and the swing of the drive shaft 100 in the drive assembly 3 with respect to its own rotation axis can be restricted by the contact of the swing restricting portion 801a with the circumferential surface 100c, preferably, a second swing restricting portion 801b of a circular arc shape is provided adjacent to the positioning surface 801a, the contact position of the second swing restricting portion 801b with the drive shaft 100 being different from the contact position of the swing restricting portion 801a with the drive shaft 100, the second swing restricting portion 801b is in contact with the arc-shaped front end portion 100a of the drive shaft 100, and the contact between the second swing restricting portion 801b and the front end portion 100a can further restrict the swing of the drive shaft 100 in the drive assembly, and can also restrict the position of the drive shaft 100 in the axial direction relative to the drive assembly.

The disengagement process of the drive assembly and the drive shaft of the present embodiment will be described with reference to the accompanying drawings.

Engagement of drive assembly with drive shaft

As shown in fig. 8 and 9, during the engagement of the drive assembly 3 with the drive shaft 100 in the axial direction, the power receiving portion 45 abuts against the front end portion 100a of the drive shaft 100 to force the drive shaft 100a to deflect toward the inner wall on the side close to the flange 301, in fig. 8, the drive shaft 100 is first abutted by the power receiving portion 45 in the deflection position shown by a in fig. 8, as the process cartridge is further mounted and advanced, the deflected drive shaft 100 continues to abut against the drive shaft 45 to maintain the deflection position and enters the deflection position shown by b in fig. 8, which is the position where the drive shaft 100 abuts against the wall near the positioning recess 801 of the positioning portion 8 and applies pressure to the positioning portion 8, in fig. 9, as the process cartridge is further mounted and the positioning portion 8 after the pressure is applied by the drive shaft 100 moves toward the bottom cover 7 against the elastic force of the elastic member 9, the elastic member 9 is elastically deformed to give the positioning portion 8 a tendency to move toward the direction approaching the drive shaft 100 by the elastic force, at this time, the process cartridge has been mounted in position, the drive shaft 100 is maintained at the yawing position shown by a in fig. 9 and is started to be rotated by the image forming apparatus about the direction R in the drawing, as the drive shaft 100 rotates, when the power receiving portion 45 is positionally aligned with the recess 100b of the drive shaft 100, the engaging portion 4501 on the power receiving portion 45 enters the recess 100b to effect engagement of the drive assembly with the drive shaft, the drive shaft 100 is at the righting position shown by b in fig. 9 under its axial centripetal force and the force applied to the drive shaft 100 by the positioning portion 8, the righting position is such that the positioning member 8 moves toward the drive shaft 100 by the urging force of the elastic member 9 to the positioning member 8 and the positioning recess 801 is caused to telescope into a part of the front end of the drive shaft 100, the swing restricting portion 801a of the positioning member 8 has an overlapping area m with the circumferential surface 100c of the drive shaft 100 in the axial direction of the flange, which ensures that the drive shaft 100 may be swung due to uneven circumferential force applied to the power receiving portion 45 when the drive shaft 100 is rotating in the drive assembly 3, in other words, if the drive shaft 100 has a tendency to swing during rotation of the drive assembly 3, the swing restricting portion 801a prevents the drive shaft 100 from having a tendency to swing by contacting the circumferential surface 100c of the drive shaft 100, so that the drive shaft 100 always maintains a righting position shown in b of fig. 9, which can be understood as the rotation axis of the drive shaft 100 is substantially coaxial with the rotation axis of the drive assembly 3. In addition, at the righting position, the second swing restricting portion 801b abuts on the front end portion 100a of the drive shaft 100 to further restrict the tendency of the drive shaft 100 to swing.

Disengagement of drive assembly from drive shaft

As shown in fig. 10, in order to facilitate disengagement of the drive unit from the drive shaft, when the process cartridge is taken out in the direction P shown by a in fig. 10, the engaging portion 4501 is moved in the axial direction of the flange 301 relative to the recessed portion 100b of the drive shaft 100 by a distance n, which is preferably set to be greater than or equal to the overlapping area m of the swing restricting portion 801a of the positioning member 8 and the circumferential surface 100c of the drive shaft 100 in the axial direction of the flange 301, and by this arrangement, when the lead-out inclined surface 4501a of the power receiving portion 45 comes into contact with the release guide inclined surface 100b2 of the drive shaft, the circumferential surface 100c of the drive shaft can be brought out of contact with the runout restricting portion 801a, that is, in the axial direction of the flange 301, without an overlapping area between the circumferential surface 100c and the runout restricting portion 801a, and at this time, as the process cartridge is further withdrawn, the drive shaft 100 is deflected into the deflected position shown as b in fig. 10 by the contact of the lead-out inclined surface 4501a of the power receiving portion 45 with the disengaging guide inclined surface 100b2 of the drive shaft, and the process cartridge is continuously withdrawn, and the drive shaft 100 maintains the deflected state until it is completely disengaged from the drive assembly and finally disengaged from the drive assembly.

The utility model provides a pair of processing box has adopted the locating component card to go into the partial beat problem of solving the rotatory in-process of drive shaft drive flange in the drive shaft bottom, because the locating component has adopted the structure ring cover of whole ring cover in the drive shaft, the problem of solution drive shaft beat that can be fine, in addition, the locating component adopts flexible structure, can not exert the power that prevents its beat to the drive shaft at the in-process of processing box installation and taking out for it is more smooth and easy to handle the box installation and take out.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A process cartridge detachably mountable to an image forming apparatus including a drive shaft having a recess, comprising:

a photosensitive drum;

a frame supporting the photosensitive drum;

characterised in that the drive assembly comprises a flange and a power receiving portion accessible to the recess, the power receiving portion being arranged to force the drive shaft to deflect during installation of the cartridge to the image forming device, the drive assembly further comprising a locating member movable relative to the flange at least in the direction of the axis of the flange, the locating member being arranged to resist the tendency of the drive shaft to deflect axially.

2. A process cartridge according to claim 1, wherein said drive shaft includes a front end portion at a front end and a circumferential surface adjoining said front end portion, and said positioning member has an overlapping area with said circumferential surface in an axial direction of said flange after said drive shaft is engaged with said power receiving portion.

3. A process cartridge according to claim 1, wherein said driving assembly further comprises a bottom cover covering said flange, and an elastic member is disposed between said positioning member and said bottom cover.

4. A process cartridge according to claim 1, wherein said positioning member includes a positioning recess portion having a cylindrical recess.

5. A process cartridge according to claim 1, wherein a positioning member regulating portion which regulates a moving stroke of said positioning member in an axial direction of said flange is provided on said flange.

6. A process cartridge according to claim 1, wherein said driving shaft contacts said positioning member and urges said positioning member to move in a direction opposite to the cartridge mounting direction during mounting of said process cartridge to said image forming apparatus.

7. A process cartridge according to claim 1, further comprising an elastic member urging said positioning member to move, said positioning member being provided with a positioning recess portion capable of fitting at least a part of said driving shaft, said elastic member urging said positioning recess portion to fit a part of a front end of said driving shaft when said driving shaft is engaged with said power receiving portion.

8. A process cartridge according to claim 1, further comprising a bottom cover covering said flange, wherein a positioning member runout restricting portion which restricts movement of said positioning member in a direction perpendicular to an axis of said flange is provided on said bottom cover or said flange.

9. A process cartridge according to claim 1, wherein the engaging portion of said power receiving portion into said recess is movable relative to said recess by a stroke in the axial direction of said flange during removal of said process cartridge from said image forming apparatus.

10. A process cartridge according to claim 1, wherein said drive shaft includes a front end portion at a front end and a circumferential surface adjoining said front end portion, said positioning member has an overlapping area m with said circumferential surface in the axial direction of said flange after said drive shaft is engaged with said power receiving portion, and an engaging portion of said power receiving portion into said recess is movable relative to said recess in the axial direction of said flange by a distance n, a length of n being equal to or greater than a length of m, measured in the axial direction of said flange, during removal of said process cartridge from said image forming apparatus.