CN105700305B

CN105700305B - Drive assembly for processing box, photosensitive drum unit, processing box and image forming device

Info

Publication number: CN105700305B
Application number: CN201610179379.6A
Authority: CN
Inventors: 罗琴; 刘金莲
Original assignee: Ninestar Corp
Current assignee: Ninestar Corp
Priority date: 2014-11-13
Filing date: 2014-11-13
Publication date: 2021-07-23
Anticipated expiration: 2034-11-13
Also published as: CN105589318B; CN105589318A; CN108614402A; CN108614402B; CN105700305A; WO2016074559A1

Abstract

The present invention provides a driving assembly for a process cartridge, comprising: the driving part comprises an engagement part, and the self-adaptive adjustment part automatically adjusts whether the driving part needs to rotate around the axis of the driving part in the installation process of the photosensitive drum unit; and a photosensitive drum, a process cartridge, and an image forming apparatus that drive the driving assembly. The self-adaptive adjusting part can ensure that the driving component can be more easily installed in the image forming device while smoothly transmitting power.

Description

Drive assembly for processing box, photosensitive drum unit, processing box and image forming device

Technical Field

The present invention relates to a drive assembly for a process cartridge, and a photosensitive drum unit including the drive assembly, a process cartridge, and an image forming apparatus including the process cartridge.

Background

The laser printing technology is very popular with users due to the advantage of printing cost. A laser printer (one of image forming apparatuses) in the related art has a detachable process cartridge mounted therein, and a process cartridge is provided with a rotary member including at least one of a developing member, a photosensitive drum, and a charging member, which is an essential component of the process cartridge, and which is directly or indirectly driven by a rotational force applied by a driving mechanism in the laser printer after being mounted to the laser printer.

As shown in fig. 1 and 2, one of the conventional methods for engaging the rotating member with the driving mechanism in the laser printer is: a protrusion 0002 is arranged on a driving mechanism in the laser printer 0001, a coupling component 0007 is arranged at the end part of a rotating component 0006 in the processing box, and the end part of the rotating component 0006 is connected with the coupling component 0007 through a universal ball; when the door 0005 of the laser printer is opened to mount the process cartridge to the cartridge mounting part 0003 of the laser printer 0001, the coupling member 0004 is inclined forward along the guide rail 0004 (as shown in fig. 2 (a)) so as to be engaged with the protrusion 0002 well, and when the process cartridge is mounted to a predetermined position, the coupling member 0004 is engaged with the protrusion 0002 coaxially (as shown in fig. 2 (b)) so that the coupling member 0007 can transmit power to the rotating member 0006 well; when the process cartridge is taken out, the coupling member 0004 and the projection are also directly inclined as shown in fig. 2(a), so that the process cartridge can be easily taken out from the laser printer.

The inventor finds that the engagement mechanism has the following defects in the process of implementing the invention: the coupling member 0007 is not well fitted to the predetermined trajectory and is engaged with the protrusion 0002 of the driving mechanism, that is, the engaging claw of the coupling member 0004 is not well engaged with the transfer pin of the protrusion 0002, which may affect the normal fitting of the process cartridge. And the rotating component can not be well ensured to be coaxial with the axis of the driving component in the rotating process, so that the printing quality is problematic.

Disclosure of Invention

The invention provides a photosensitive drum unit, which aims to solve the technical problem that the printing quality is poor due to the fact that the central axis of a rotating component and the axis of a driving component are coaxial in the rotating process of the rotating component cannot be guaranteed by a driving component for an existing processing box.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a driving assembly for a process cartridge includes: the drive division, with shaft coupling and control that the drive division is connected the flexible part of shaft coupling and drive division axial extension, the drive division includes the meshing part, and characterized by still includes the self-adaptation adjustment part, the self-adaptation adjustment part is in the sensitization drum unit installation automatic adjustment whether the drive division needs to rotate around the drive division axis.

Preferably, the self-adaptive adjusting portion automatically adjusts whether the driving portion needs to rotate around the driving portion axis during the mounting of the driving component, and determines whether the driving portion needs to rotate around the driving portion axis by abutting against a guide rail in the image forming apparatus:

when the self-adaptive adjusting part abuts against a guide rail in the image forming device in the installation process of the driving component, the driving part rotates around the axis of the driving part;

when the adaptive adjusting part is not abutted with a guide rail in the image forming device in the installation process of the driving component, the driving part does not rotate around the axis of the driving part.

Preferably, the adaptive adjustment portion is provided on the engagement portion.

Preferably, the engaging portion is a pair of engaging claws arranged symmetrically in the axial direction of the driving portion.

Preferably, the driving portion is provided with a recess, and the pair of engaging claws is provided on a circumferential surface of the recess and extends in the axial direction of the driving portion; the self-adaptive adjusting portion is a pair of extending portions which are provided on the circumferential surface of the groove and symmetrically distributed along a direction perpendicular to the axial direction of the driving portion, and the pair of extending portions and the pair of engaging claws are arranged at substantially 90 ° to each other on the circumferential surface of the groove.

Preferably, a unidirectional rotation control mechanism for controlling the unidirectional rotation of the driving part is further arranged between the coupler and the driving part.

Preferably, the driving part further comprises a stud, two grooves are symmetrically arranged on the stud, each groove is respectively provided with a first plane, a second plane and a first cambered surface, and the first plane is approximately perpendicular to the axis of the driving part; the second plane is substantially parallel to the drive section axis; the first cambered surface is arranged at a position opposite to the first plane, one end of the coupler, which is connected with the protruding column of the driving part, is provided with a pair of through holes, the unidirectional rotation control mechanism comprises a pair of springs and a pair of columns, one ends of the columns are respectively arranged in the coupler through holes, and the springs are sleeved on the outer sides of the columns; the other ends of the pair of cylinders are respectively matched with the two grooves on the protruding columns of the driving part.

Preferably, the driving part further comprises a protrusion and a connecting column connecting the protrusion and the engaging part, the protrusion of the driving part is directly arranged as a part of the coupling, and the adaptive adjusting part is arranged on a side wall of the connecting column.

Preferably, the adaptive adjustment part is two protruding teeth symmetrically arranged.

Preferably, a unidirectional rotation control mechanism for controlling the unidirectional rotation of the driving part is further arranged in the driving assembly.

Preferably, the unidirectional rotation control mechanism is a ratchet mechanism capable of unidirectional rotation.

In another aspect, the present invention further provides a photosensitive drum unit, including a photosensitive drum and a driving assembly, where the photosensitive drum includes a hollow cylinder, and a layer for forming an electrostatic latent image is disposed on the surface of the cylinder; the device is characterized in that the driving component is any one of the driving components; and the other end of the driving component opposite to the driving part is provided with a sleeve, and the outer side of the sleeve is directly sleeved in the hollow cylinder.

In another aspect, the present invention preferably further provides a process cartridge including a frame and a photosensitive drum unit, wherein the photosensitive drum unit is any one of the photosensitive drum units described above, and the photosensitive drum unit is supported by the frame.

In another aspect, the present invention also provides an image forming apparatus including an image forming device provided therein with a process cartridge mounting portion, a guide rail guiding mounting of a process cartridge, and a drive mechanism, and a process cartridge detachably mounted to the process cartridge mounting portion of the image forming device; the process cartridge is the above preferred process cartridge.

Preferably, any one of the above-mentioned driving assemblies is arranged in the processing box; and an adaptive adjustment portion in the drive assembly automatically adjusts whether the drive portion needs to rotate around a drive portion axis when the process cartridge is loaded into the image forming apparatus, and determines whether the drive portion needs to rotate around the drive portion axis by abutting against a guide rail in the image forming apparatus:

the driving part rotates around the axis of the driving part when the self-adaptive adjusting part abuts against a guide rail in the image forming device in the mounting process of the processing box;

when the adaptive adjusting part is not abutted with a guide rail in the image forming device in the process of mounting the processing box, the driving part does not rotate around the axis of the driving part.

After the technical scheme is adopted, the engagement part on the driving part can not interfere with the driving part in the image forming device in the mounting process through the self-adaptive adjusting part on the driving assembly, so that the engagement part can be well engaged with the driving part in the image forming device; and the driving part is not inclined when being installed, so that the power can be well transmitted to the rotating part in the processing box, and the good printing effect of the image forming device is ensured. Furthermore, the coupling connected with the driving part is arranged to be a cross coupling, and particularly, the inclined plane matched with the groove and the protrusion in the cross coupling adopts an inclined plane, so that the driving part can have a larger stroke along the axial direction in the process of axial translation, and the driving part is more favorably separated from the driving part in the image forming device.

Drawings

FIG. 1 is a partial view of a prior art laser printer;

FIGS. 2(a) and 2(b) are schematic views showing a photosensitive element on a third process cartridge of the related art engaged with a driving gear in an image forming apparatus;

fig. 3 is a schematic structural diagram of a process cartridge according to an embodiment of the present invention;

FIG. 4 is an exploded view of the cartridge of FIG. 3;

FIG. 5 is a cross-sectional view of a driving assembly and a supporting member of a process cartridge according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a photosensitive drum assembly according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a driving assembly according to an embodiment of the present invention;

fig. 8 is an exploded view of a driving assembly according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a driving portion of a driving assembly according to an embodiment of the present invention;

FIG. 10 is a schematic structural view of a first coupling member of a drive assembly according to an embodiment of the present invention;

FIG. 11 is a schematic view of a sleeve of a drive assembly according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a clamp spring in a driving assembly according to a first embodiment of the present invention;

fig. 13 is an exploded view of a driving assembly according to a second embodiment of the present invention;

fig. 14 is a schematic structural diagram of a driving portion in a driving assembly according to a second embodiment of the present invention;

fig. 15 is a schematic structural diagram of a power transmission column in a driving assembly according to a second embodiment of the present invention;

fig. 16 is an assembly view of a power transmission column, a buckle and a spring in a driving assembly according to a second embodiment of the present invention;

fig. 17 is a schematic structural diagram of a sleeve in a driving assembly according to a second embodiment of the present invention;

fig. 18 is a schematic structural view of an image forming apparatus according to a third embodiment of the present invention;

FIG. 19 is a schematic view of a guide rail in an image forming apparatus according to a third embodiment of the present invention;

fig. 20 is a schematic structural view of a protrusion in an image forming apparatus according to a third embodiment of the present invention;

fig. 21 is a schematic structural view of a process cartridge in a first state in an image forming apparatus according to a third embodiment of the present invention;

FIG. 22 is an enlarged partial schematic view of FIG. 21;

fig. 23 is a schematic structural view of a process cartridge in a second state in an image forming apparatus according to a third embodiment of the present invention;

FIG. 24 is an enlarged partial schematic view of FIG. 23;

FIG. 25 is a schematic structural view of a process cartridge in a third state in an image forming apparatus according to a third embodiment of the present invention;

fig. 26 is a partial schematic view of a process cartridge in a first state in an image forming apparatus according to a fourth embodiment of the present invention;

fig. 27 is a partial schematic view of a process cartridge in a second state in an image forming apparatus according to a fourth embodiment of the present invention.

Detailed Description

In order to make the technical solutions related to the present invention easier and clearer for those skilled in the art to understand, the following description is made with reference to specific embodiments.

Example one

As shown in fig. 3 to 5, a process cartridge 1 according to one embodiment of the present invention is provided, in which the process cartridge 1 is detachably mounted in an image forming apparatus (the fifth embodiment will be described in detail). As shown in fig. 3, the process cartridge 1 includes a cartridge frame 2, a driving unit 4 for receiving a driving force in the image forming apparatus, and a supporting member 3 provided at a side wall of the cartridge frame 2, the supporting member 3 being provided with a through hole through which a driving portion 40 of the driving unit 4 is passed, at least a portion of the driving portion being exposed to the outside of the cartridge frame 2.

As shown in fig. 4 and 5, the process cartridge 1 includes a toner hopper 21 for accommodating toner (a kind of developer), a waste toner hopper 22 for accommodating waste toner, and a photosensitive drum unit 5; the powder bin 21 and the waste powder bin 22 are respectively provided with crescent arcs 21d and 22d for supporting the supporting part 3; the inner wall of the supporting part 3 is provided with guide

inclined planes

31 and 32 for limiting the swing of the driving component 4, the powder bin 21 is provided with extending

parts

21a and 21b, the waste powder bin 22 is provided with through

holes

22a and 22b, and the extending

parts

21a and 21b and the through

holes

22a and 22b are hinged together through pins respectively; one end of the photosensitive drum unit 5 is supported by the supporting member 3, and the other end is fixedly connected to the through hole 22c of the waste powder bin 22 by a pin. The driving assembly 4 receives the driving force from the image forming device to drive the photosensitive drum to rotate, and the helical gear 4a arranged outside the sleeve 44 of the driving assembly 4 can transmit the driving force to the magnetic roller 21e through the gear 21c at the end of the magnetic roller 21e, and the magnetic roller 21e and the axis of the photosensitive drum are always kept in a basically parallel state.

As shown in fig. 5, in the driving unit 4, a driving portion 40 receiving the driving force of the image forming apparatus is sleeved in a sleeve 44 through a coupling, and a spring 45 is provided between the coupling and the inner wall of the sleeve 44, so that the driving portion 40 can axially extend and contract relative to the inner wall of the sleeve 44; it is convenient that the process cartridge 1 can be well mounted into the image forming apparatus.

As shown in fig. 6, the present embodiment provides a photosensitive drum unit 5 including a photosensitive drum 50 capable of transferring an image to an image medium (such as a sheet of paper), a driving unit 4 provided at an end of the photosensitive drum 50, the photosensitive drum including a hollow cylindrical body on the surface of which a layer for forming an electrostatic latent image is provided; the rotational axis of the drive assembly 4 and the rotational axis of the photosensitive drum 50 are substantially coaxial; the structure of the drive assembly 4 will be described in detail below.

As shown in fig. 7 and 8, the driving unit 4 includes a driving portion 40 for receiving the driving force of the image forming apparatus, and a sleeve 44 of the driving unit 4 for engaging with the driving portion 40, wherein the diameter of the outer wall 4b of the sleeve 44 is approximately equal to the inner diameter of the photosensitive drum 50, so that the sleeve of the driving unit can be fitted into the photosensitive drum 50 by press-fitting, and the driving unit 4 does not come off from the photosensitive drum 50.

As shown in fig. 8 and 9, the engagement portion 40 of the present embodiment is preferably capable of engaging with the protrusion 1002 of the image forming apparatus shown in fig. 20, and the protrusion 1002 includes a driving rod 1002d connected to the motor, a tapered ball head 1002a provided at the front end of the driving rod 1002d, and driving

pins

1002b and 1002c provided at both sides of the driving rod 1002 d. The driving component 4 comprises an engaging part 40, and an engaging part for receiving driving force and an adaptive adjusting part for adjusting the rotation of the engaging part are arranged on the engaging part 40; preferably, the driving portion 40 is provided with a plurality of grooves 40e, the engaging portion is two

engaging claws

40c, 40d symmetrically arranged in the axial direction of the driving portion, and the engaging

claws

40c, 40d are provided on the circumferential surface of the groove 40e, and the engaging

claws

40c, 40d may extend in the axial direction of the driving portion 40; thus, when the driver 40 is engaged with the projection 1002, the tapered ball 1002a is positioned in the groove 40e, and the driving pins 1002b and 1002c are engaged with the engaging

claws

40c and 40d, respectively, so that the projection 1002 receives power from the motor and transmits the power to the driver 40. Preferably, the adaptive adjustment portion on the driving portion 40 is an

extended portion

40a, 40b provided on the circumferential surface of the recess 40e and along a direction perpendicular to the axial direction of the driving portion, the

extended portion

40a, 40b and the engaging

claw

40c, 40d are arranged at substantially 90 ° to each other on the circumferential surface of the recess 40 e.

Preferably, two grooves are symmetrically arranged on the stud of the driving part 40, each groove is provided with a first plane 403, and the first plane is approximately perpendicular to the axis of the driving part; a second plane 404 substantially parallel to the drive portion axis; a first arc surface 405 is disposed opposite the first plane.

As shown in fig. 5 and 8, the driving part is sleeved in the sleeve 44 through a coupler, and a telescopic component for controlling the driving part 40 and the coupler to axially extend and retract is arranged between the coupler and the sleeve 44, preferably, the telescopic component is a spring 45 sleeved at the end part of the coupler, one end of the spring is abutted against the inner wall of the sleeve, and the other end of the spring is abutted against the coupler; and the end part of the coupler is provided with a groove 43a, and the coupler is clamped on the sleeve 44 through the clamping of the E-shaped clamp spring and the groove 43a as shown in figure 12, so that the driving part 40 and the coupler are prevented from being separated from the sleeve 44.

As shown in fig. 8, the coupling is a cross coupling including a first member 41, a second member 42, and a third member 43, the first member 41 includes an i-shaped protrusion 41a protruding therefrom, the second member 42 includes a slide groove 42b engaged with the protrusion 41a of the first member and a protrusion 42a opposite to the slide groove 42, the third member 43 includes a groove 43E engaged with the protrusion 42a of the second member, pins 43c, 43d transmitting power to a sleeve 44, a cylindrical body 43b of a socket spring 45, and a groove 43a engaged with an E-shaped snap spring 51. As shown in fig. 5, the sliding surface between the groove 43e and the protrusion 42a is preferably inclined to the axis of the driving portion, so that the driving portion 40 can have a larger stroke along the axial direction during the axial translation, and the driving portion 40 can be more easily disengaged from the protrusion 1002 in the image forming apparatus.

As shown in fig. 8 and 11, the sleeve 44 is provided with a helical gear 4a outside to accommodate a cavity 44b of the coupler, and a through hole 44d is provided in the sleeve 44 for allowing the coupler upper cylinder 43a to pass through, and two

symmetrical grooves

44a and 44e are provided on the inner wall of the sleeve 44, and the grooves are respectively matched with

pins

43c and 43d on the coupler for transmitting power, so as to transmit the rotation force of the driving part 40 to the sleeve 44, thereby driving and driving the photosensitive drum 50 to rotate.

As shown in fig. 8 and 10, preferably, a mechanism for controlling the unidirectional rotation of the driving portion 40 is further disposed between the coupling and the driving portion 40, the mechanism includes springs 46 and 47 disposed in through holes 41d and 41e of the first member 41 of the coupling, and cylinders 48 and 49, one ends of the cylinders 48 and 49 are respectively inserted into the through holes 41d and 41e, the other ends of the cylinders 48 and 49 are respectively and symmetrically provided with two grooves matching with the studs, one ends of the springs 46 and 47 are respectively sleeved in the cylinders 48 and 49, and the other ends of the springs are in contact with the surface of the second member 42; thus, when the drive portion 40 is moved in the direction a in fig. 9, rotation of the drive portion 40 is prevented because the cylinders 48, 49 abut the first plane, which is substantially parallel to the drive portion axis; however, when the driving portion 40 moves in the direction B of fig. 9, the first cambered surface 405 may apply a force to the cylinders 48, 49 in the direction B, so that the cylinders 48, 49 continuously press the springs 46, 47, and thus the cylinders do not prevent the driving portion from rotating in the direction B. The mechanism can control the driving part 40 to rotate in one direction. Preferably, the end of the driving part 40 can pass through the through hole 41f of the first member 41, and then the driving head is prevented from being released from the coupling by the E-shaped clip spring.

Example two

As shown in fig. 13 to 17, another driving assembly is provided, which is otherwise the same as the first embodiment, and includes a driving part 140, a coupling, a control mechanism for controlling the driving part to rotate in one direction, a sleeve 148 for accommodating the coupling, and a telescopic mechanism for controlling the coupling and the driving part to axially extend and retract. Preferably, the driving portion 140 includes a power receiving engaging portion for receiving power from the protrusion 1002 of the image forming apparatus, the engaging portion having the same engaging claws 140a as in the first embodiment, the engaging claws being symmetrically arranged on the circumferential surface of one of the recesses; different from the first embodiment, the driving part comprises an engaging part, a protrusion 140d and a connecting column 140c connecting the protrusion 140d and the engaging part, the protrusion 140d of the driving part is directly arranged as a part of the coupling, and the adaptive adjusting part is arranged on the side wall of the connecting column and is two protruding teeth 140b which are symmetrically arranged. The coupling of the present embodiment may omit the first member in the first embodiment, and also include the second member 141 and the third member 142, and the second member 141, the third member 142, and the protrusion 140d are connected by the cross coupling. It should be noted that the second member 141 of the coupling is only for allowing the driving portion and the sleeve (photosensitive drum) to slide in more directions, and if the technical solution provided by this embodiment is simplified, the second member 141 can be omitted.

As shown in fig. 13, a support cap 146 for supporting the third member 142 is further disposed between the coupling and the sleeve 148, or the support cap 146 and the third member 142 may be integrally formed, but in this embodiment, both are preferably formed as a single body for facilitating installation of a spring in the below-described ratchet mechanism. Between the support cap 146 and the sleeve 148a spring 147 is arranged, which is identical to the first embodiment. The end of the support cap 146 is also secured to the outside of the sleeve by an E-clip.

As shown in fig. 13, 15, 16 and 17, in the present embodiment, the sleeve 148 is fixedly connected to the photosensitive drum, and the protrusion 140d at the end of the driving portion 140 is provided as a part of the coupling, so that the driving portion 140 cannot rotate around the coupling, but the driving portion can be controlled to rotate unidirectionally around the sleeve by controlling the coupling to rotate unidirectionally around the driving sleeve, while the sleeve and the photosensitive drum are fixedly connected, so that the driving portion 140 can rotate unidirectionally around the photosensitive drum. Preferably, in the embodiment, the coupling is controlled to rotate around the sleeve in a single direction by the ratchet mechanism; specifically, the ratchet mechanism includes a spring 145 disposed in a slide groove 142c at an end of the third member 142, and

parts

143 and 144 rotatable around

inner arcs

142b and 142d of the third member 142, respectively, one end of the

parts

143 and 144 being provided with arc surfaces corresponding to the

arcs

142b and 142d, and the other end thereof being provided with a flat surface abutting against the sleeve 148. As shown in fig. 16, the spring 145 causes the

discrete pieces

143, 144 to be at least partially external to the third member 142. As shown in fig. 17, the sleeve 148 includes a housing portion 148a housing the coupling, a gear 148 d; the grooves are symmetrically arranged on the inner wall of the sleeve 148 and comprise a first plane 148b parallel to the axial direction of the sleeve and an arc surface 148c arranged opposite to the first plane 148 b. Thus when the drive assembly is assembled the flat faces of the ends of the

parts

143, 144 lie in the recesses in the sleeve 148 and when the coupling is rotated in direction C of figure 17 the flat faces of the ends of the

parts

143, 144 abut the first flat faces 148b of the recesses in the sleeve so that rotation of the coupling member in direction C is prevented; when the coupling is rotated in direction D of fig. 17, the arcuate surface 148c in the sleeve presses against the

parts

143, 144, which further press against the spring 145; this allows the coupling to rotate unidirectionally within sleeve 148.

It should be noted that the adaptive adjustment part in this embodiment may also be set to be the same as that in the first embodiment; the mechanism for controlling the unidirectional rotation of the driving unit 140 may be the same as that of the first embodiment.

EXAMPLE III

As shown in fig. 18 to 25, there is provided an image forming apparatus including an image forming device and a process cartridge detachably mountable to the image forming device; the process cartridge is preferably the process cartridge provided in the first embodiment, and the image forming apparatus 1000 includes a process cartridge mounting portion 1001 to which the process cartridge can be mounted; the driving mechanism comprises a motor for providing power for rotating elements in the processing box, such as a photosensitive drum and a magnetic roller (or a developing roller), and also comprises a protrusion 1002 directly matched with a driving component in the processing box, and power is transmitted between the protrusion 1002 and the motor through a gear or a belt; the image forming apparatus further includes a guide 1003 guiding the mounting of the process cartridge and a cover 1004 for allowing the process cartridge to be stably mounted in the process cartridge mounting portion 1001. Preferably, the guide rail 1003 includes a first step surface 1003a, a second step surface 1003b parallel to the first step surface in the horizontal direction, a third step surface 1003c contiguous to the second step surface 1003b and inclined to the second step surface 1003b, and a dimension of the third step surface 1003c in the axial direction of the photosensitive drum in the cartridge is gradually increased along the cartridge mounting direction; the guide 1003 is further provided with a circular arc portion 1003d, and when the process cartridge is completely mounted in the image forming apparatus, the front end of the process cartridge abuts against the circular arc portion 1003 d. Preferably, the projection 1002 includes a drive rod 1002d, a tapered ball head 1002a disposed at a front end of the drive rod 1002d, and drive

pins

1002b, 1002c disposed on both sides of the drive rod 1002 d.

Preferably, the driving assembly in the process cartridge in this embodiment is the driving assembly 4 described in embodiment two.

As shown in fig. 21, 22, which are schematic structural views of the process cartridge 1 mounted in the image forming apparatus in the first state; if there is no adaptive adjustment portion on the drive unit 4, the engaging claw 40c or the engaging claw 40d of the drive portion 40 is located forward in the axial direction of the drive portion 40 in the cartridge mounting direction, and the engaging

claws

40c, 40d are convex in the axial direction of the drive portion, so that the engaging claw 40c or the engaging claw 40d interferes with the tapered ball 1002a at the front end of the drive portion 1002 during mounting, which affects mounting of the cartridge 1. Therefore, the driving portion 4 of this embodiment is preferably provided with two extending

portions

40a, 40b as the adaptive adjusting portions, so that the engaging

claws

40c, 40d are automatically adjusted to the positions where they do not interfere with the tapered ball 1002a by the collision of the extending

portion

40a or 40b with the third step surface 1003c on the guide rail during the process cartridge mounting.

As shown in fig. 23, 24, which are schematic structural views of the process cartridge 1 mounted in the image forming apparatus in the second state; in this state, the extending portion 40a or the extending portion 40b is located forward in the axial direction of the driving portion 40 in the cartridge mounting direction; therefore, the

engagement claws

40c and 40d do not interfere with the tapered ball 1002a, and therefore the extending

portions

40a and 40b as the adaptive adjustment portions do not need to adjust the state of the driving portion 40 by means of a guide rail. As described in detail in the second embodiment, a mechanism for controlling the unidirectional rotation of the driving portion 40 is further disposed between the coupler and the driving portion 40 in the driving assembly 4, and preferably, the direction in which the driving portion 40 can rotate in one direction is clockwise in fig. 22; the driving portion 40 is not rotated at will during the mounting process, which is more advantageous for controlling the engaging

claws

40a, 40b of the driving portion 40 to rotate according to a predetermined trajectory.

As shown in fig. 25, the process cartridge 1 is fully mounted in the image forming apparatus 1000, and the driving portion 40 in the driving unit 4 is engaged with the protrusion 1002, and specifically, the engaging

claws

40c, 40d on the driving portion 40 are engaged with the driving

pins

1002b, 1002c on the protrusion 1002.

Preferably, the driving unit 4 is provided with a cross coupling so that when the process cartridge 1 is pulled out of the image forming apparatus, the driving unit 40 can be separated from the projection 1002 with a buffer later than the process cartridge frame is separated from the guide 1003d, which is more advantageous for separation of the driving unit 40. Further, the sliding surface between the groove 43e and the protrusion 42a is inclined to the axis of the driving portion, so that the driving portion 40 can have a larger stroke along the axial direction during the axial translation process, and the driving portion 40 can be more easily disengaged from the protrusion 1002 in the image forming apparatus.

Example four

As shown in fig. 26 and 27, there are provided partial schematic views of another image forming apparatus, the fourth embodiment and the third embodiment including the same image forming device 1000 and the same process cartridge frame; the difference is that the driving component in the processing box provided by the embodiment is the driving component in the second embodiment; specifically, the adaptive adjusting part is a protruded tooth 140b arranged on the side wall of the driving part 140, and the protruded tooth 140b can adjust the state of the engaging claw with the step surface 1003c on the guide rail 1003 as well; and a thorn wheel mechanism for adjusting the unidirectional rotation of the driving part is also arranged in the driving component. The engaging claw 140a at the end of the driving member can be well engaged with the driving pin on the projection 1002 after the process cartridge is completely mounted to the image forming apparatus; and has the same advantageous effects as in example five.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced, for example, the driving assembly may also drive other rotating elements in the process cartridge, such as a developing element or an agitating element; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A drive assembly for a process cartridge detachably mountable to an image forming apparatus including a guide rail guiding mounting of the process cartridge, the drive assembly comprising: the driving part is arranged in the sleeve and transmits power to the sleeve, the driving part comprises a meshing claw for receiving the power and a connecting column connected with the meshing claw,

the method is characterized in that: the side wall of the connecting column is provided with a self-adaptive adjusting part, the self-adaptive adjusting part is two protruded teeth symmetrically arranged relative to the rotating axis of the connecting column, and the self-adaptive adjusting part enables the driving part to rotate relative to the sleeve when the processing box is contacted with the guide rail in the installation process.

2. The driving assembly according to claim 1, wherein a projection for transmitting a rotational power is provided in the image forming apparatus, the projection includes a driving lever and a tapered ball provided at a front end of the driving lever, and the adaptive adjustment portion rotates the driving portion from a position where the engaging pawl on the driving portion interferes with the tapered ball of the front end of the driving lever in the image forming apparatus to a position where the engaging pawl does not interfere with the tapered ball of the front end of the driving lever in the image forming apparatus after contacting with the guide rail of the image forming apparatus to rotate the driving portion.

3. The drive assembly as claimed in claim 1 or 2, wherein the adaptive adjustment portion projects in a direction perpendicular to the drive portion axial direction.

4. The drive assembly according to claim 1 or 2, wherein the drive portion is further provided with a groove, and the engagement claws are provided in a pair and are arranged on a circumferential surface of the groove symmetrically with respect to a rotational axis of the drive portion.

5. A drive assembly according to claim 1 or 2, wherein said two lobes are arranged symmetrically on the side wall of said connecting column with respect to the rotational axis of said drive part.

6. A drive assembly according to claim 3, wherein the distance from the axis of the drive portion to the outer surface of the connection column on which the adaptive adjustment portion is provided is greater than the distance to said axis to the outer surface of the connection column on which the adaptive adjustment portion is not provided.

7. A drive assembly according to claim 2, wherein the adaptive adjusting portion brings the engaging pawl of the drive portion into a position to avoid interference with a leading end tapered ball of the drive lever in the image forming apparatus when the engaging pawl of the drive portion is in the mounting direction of the process cartridge when the engaging pawl is in contact with the guide rail in the image forming apparatus during mounting of the process cartridge, and the engaging pawl of the drive portion is in a position to avoid interference with the leading end tapered ball of the drive lever in the image forming apparatus when the adaptive adjusting portion is in the mounting direction of the process cartridge.

8. The drive assembly as claimed in any one of claims 1 to 6, further comprising a unidirectional rotation control mechanism for controlling unidirectional rotation of the drive portion about the sleeve.

9. The drive assembly as recited in claim 8, wherein said drive portion is rotatable about said sleeve when said drive portion is rotated in a clockwise direction by said unidirectional rotation control mechanism.

10. The drive assembly as recited in claim 9, wherein said drive portion is adapted to transmit power to said sleeve when said drive portion is rotated in a counterclockwise direction by said unidirectional rotation control mechanism.

11. The drive assembly as claimed in claim 8, wherein the drive portion further comprises a stud, two grooves are symmetrically disposed on the stud, each of the grooves is respectively provided with a first plane, a second plane and a first cambered surface, and the first plane is substantially perpendicular to the drive portion axis; the second plane is substantially parallel to the drive section axis; the first cambered surface is arranged at a position opposite to the first plane, the driving assembly further comprises a coupler, one end of the coupler, which is connected with the protruding column of the driving part, is provided with a pair of through holes, the unidirectional rotation control mechanism comprises a pair of springs and a pair of cylinders, one ends of the cylinders are respectively arranged in the coupler through holes, and the springs are sleeved on the outer sides of the cylinders; the other ends of the pair of cylinders are respectively matched with the two grooves on the protruding columns of the driving part.

12. The utility model provides a photosensitive drum unit, photosensitive drum unit includes the photosensitive drum, the photosensitive drum includes hollow cylinder the cylinder surface is provided with the picture layer that forms electrostatic image, its characterized in that still includes the drive assembly of any of claims 1 to 6,8, the sleeve sets up drive assembly with the opposite other end of drive division, the outside of sleeve directly cup joints the inside of hollow cylinder.

13. A process cartridge comprising a frame, characterized by further comprising the photosensitive drum unit according to claim 12, the photosensitive drum unit being supported by the frame.

14. The process cartridge according to claim 13, detachably mountable to an image forming apparatus including a driving mechanism including a projection for transmitting a rotational power, the projection including a driving lever and a tapered ball provided at a front end of the driving lever, wherein the adaptive adjustment portion rotates the driving portion relative to the sleeve when coming into contact with a guide rail in the image forming apparatus during mounting of the process cartridge, while the engagement claw rotates from a position interfering with the tapered ball of the front end of the driving lever in the image forming apparatus to a position not interfering with the tapered ball of the front end of the driving lever in the image forming apparatus.