CN214375856U - Drive assembly of box and box - Google Patents

Abstract

The utility model discloses a driving component of a box and the box, wherein the box comprises a photosensitive drum connected with the driving component, the driving component comprises a connecting piece with a hollow cavity and a swing arm rotationally arranged in the connecting piece around a rotating shaft; the swing arm comprises a butted end and a driving force receiving end, the butted end is positioned at the front side of the driving force receiving end in the axial direction of the connecting piece, and the rotating shaft is positioned between the butted end and the driving force receiving end in the axial direction of the connecting piece; wherein when the abutted end receives the external abutting force to rotate to the radially outer side of the coupling, the driving force receiving end rotates to the radially inner side of the coupling to the rotational driving force receiving position, thereby being capable of receiving the driving force for rotating the coupling. The utility model discloses a drive assembly also can stably receive rotary driving force from electrophotographic imaging device's drive shaft even under long-term use.

Description

Drive assembly of box and box

Technical Field

The utility model relates to a box and drive assembly for installing to electrophotographic image forming apparatus.

Background

Process cartridges are widely used in electrophotographic image forming apparatuses such as printers, copiers, facsimile machines, and the like. Generally, a process cartridge includes a photosensitive drum, a photosensitive frame that rotatably supports the photosensitive drum, and a drive assembly connected to the photosensitive drum. After the process cartridge is mounted to an electrophotographic image forming apparatus having a drive shaft, a drive assembly receives a driving force for rotating the photosensitive drum in cooperation with the drive shaft.

Fig. 1 shows a drive shaft 100 of an electrophotographic image forming apparatus in the related art, the drive shaft 100 having a concave portion 101 and an abutting portion 102, the concave portion 101 being located on a front side of the abutting portion 102 in an axial direction of the drive shaft 100. Wherein the abutment portion 102 is arranged to circumferentially surround the drive shaft 100 and has a tapered surface 1021 at its front side. The number of the recesses 101 may be three, and the three recesses 101 are uniformly arranged in the circumferential direction of the drive shaft 100. The recess 101 has an inclined surface 1011 inclined with respect to the axial direction of the drive shaft 100, and the inclined surface 1011 has an inclined direction opposite to the tapered surface 1021.

There is a process cartridge in which a drive unit connected to a photosensitive drum has a cylindrical coupling member and an engaging portion in the coupling member, the engaging portion being connected to the coupling member through an elastic deformation portion. When the process cartridge is mounted, the engaging portion engages with the recess of the drive shaft, and the coupling member rotates the photosensitive drum in accordance with the rotation of the drive shaft. Such a process cartridge has a drawback in that with frequent stress of the driving assembly, there is a risk that the engaging portion and the coupling member are broken, thereby affecting stable transmission of the driving force.

Disclosure of Invention

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a cartridge for an electrophotographic image forming apparatus and a driving assembly thereof, which can stably receive a rotational driving force from a driving shaft of the electrophotographic image forming apparatus even when used for a long period of time.

The utility model discloses a first aspect provides a drive assembly of box, and wherein, the box includes the sensitization drum of being connected with drive assembly, and drive assembly includes:

a coupling piece having a hollow cavity;

the swing arm is rotatably arranged in the connecting piece around the rotating shaft; the swing arm comprises a butted end and a driving force receiving end, the butted end is positioned at the front side of the driving force receiving end in the axial direction of the connecting piece, and the rotating shaft is positioned between the butted end and the driving force receiving end in the axial direction of the connecting piece;

wherein when the abutted end receives the external abutting force to rotate to the radially outer side of the coupling, the driving force receiving end rotates to the radially inner side of the coupling to the rotational driving force receiving position, thereby being capable of receiving the driving force for rotating the coupling.

According to a particular embodiment of the first aspect of the invention, the rotation axis is arranged in the chord direction of the coupling member; and a gap is reserved between the rotating shaft and the shaft hole on the connecting piece and/or the shaft hole on the swing arm.

According to a specific embodiment of the first aspect of the present invention, the coupling member has a first rotation restricting portion located at a rear side of the rotating shaft in an axial direction of the coupling member; when the swing arm abuts against the first rotation restricting portion, the abutted end is further away from the rotation center of the coupling than the driving force receiving end.

According to a specific embodiment of the first aspect of the present invention, the coupling member has a second rotation restricting portion located on a front side of the rotating shaft in an axial direction of the coupling member; when the swing arm abuts against the second rotation restricting portion, the driving force receiving end is held at the rotational driving force receiving position.

According to a particular embodiment of the first aspect of the invention, the drive assembly further comprises a sleeve connected to the rotational member and a first resilient element arranged in the sleeve, the coupling being at least partially inserted in the sleeve, the first resilient element pushing the coupling outwards in an axial direction of the coupling.

Another aspect of the present invention provides a cartridge for mounting in an electrophotographic image forming apparatus, the electrophotographic image forming apparatus including a drive shaft having a concave portion and an abutting portion, the concave portion being located on a front side of the abutting portion in an axial direction of the drive shaft; the cartridge includes:

a frame;

a rotating member provided on the frame;

a drive assembly coupled to the rotating member for receiving a drive force from the drive shaft to rotate the rotating member;

the driving assembly comprises a connecting piece for inserting a driving shaft and a swing arm rotatably arranged in the connecting piece around a rotating shaft, wherein the swing arm comprises a butted end and a driving force receiving end, the butted end is positioned on the outer side of the driving force receiving end in the axial direction of the connecting piece, and the rotating shaft is positioned between the butted end and the driving force receiving end in the axial direction of the connecting piece; the abutted end can be abutted by the abutting part of the driving shaft, so that the swing arm rotates to move the driving force receiving end into the concave part of the driving shaft.

According to another aspect of the present invention, in a specific embodiment, the shaft is disposed in a chord direction of the coupling member; and a gap is reserved between the rotating shaft and the shaft hole on the connecting piece and/or the shaft hole on the swing arm.

According to a specific embodiment of another aspect of the present invention, the coupling member has a first rotation restricting portion located at a rear side of the rotating shaft in an axial direction of the coupling member; when the swing arm abuts against the first rotation restricting portion, the abutted end is further away from the rotation center of the coupling than the driving force receiving end.

According to a specific embodiment of another aspect of the present invention, the coupling member has a second rotation restricting portion located on a front side of the rotating shaft in an axial direction of the coupling member; after the driving force receiving end moves into the recess of the drive shaft, the second restriction portion and the abutting portion clamp the swing arm to prevent the swing arm from rotating about the rotation shaft.

According to another aspect of the present invention, in a specific embodiment, the driving assembly further includes a sleeve connected to the coupling member and a first elastic member disposed in the sleeve, the coupling member being at least partially inserted into the sleeve, the first elastic member pushing the coupling member outward in an axial direction of the coupling member.

According to another aspect of the present invention, one or more deflection restricting portions for restricting deflection of the drive shaft are provided on the inner peripheral wall of the coupling, and the drive force receiving member and the deflection restricting portion are provided in the circumferential direction of the coupling.

Wherein the deflection restricting portion may be fixedly provided on the inner circumferential wall of the coupling member.

Wherein the deflection limiting portion may also be movably connected with the coupling member, the drive assembly further comprising a second resilient element urging the deflection limiting portion radially inwardly of the coupling member.

According to another aspect of the present invention, in a preferred embodiment, the rotating member is a photosensitive drum, and the swing arm is located axially outside the photosensitive drum.

The utility model discloses in, drive assembly is including rotationally setting up the swing arm in the connector, and this swing arm gets into or shifts out the concave part through the rotation mode, even also has the structural strength of preferred under long-term the use, can receive rotary drive power from the drive shaft steadily.

To more clearly illustrate the objects, technical solutions and advantages of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Drawings

Fig. 1 is an axial sectional view of a driving shaft of an electrophotographic image forming apparatus in the related art;

FIG. 2 is a view showing the structure of an embodiment of the process cartridge according to the present invention;

FIG. 3 is a perspective view of embodiment 1 of the drive assembly;

FIG. 4 is an axial cross-sectional view of embodiment 1 of the drive assembly;

FIG. 5 is an axial perspective cross-sectional view of the coupling in embodiment 1 of the drive assembly;

FIG. 6 is an axial cross-sectional view of embodiment 2 of the drive assembly;

FIG. 7 is an axial projection view of embodiment 3 of the drive assembly;

FIG. 8 is a sectional view A-A of FIG. 7;

FIG. 9 is an axial projection view of embodiment 4 of the drive assembly;

FIG. 10 is an axial projection view of embodiment 5 of the drive assembly;

FIG. 11 is an assembled view of a deflection restricting section in embodiment 5 of the drive assembly;

FIG. 12 is a perspective view of a deflection limiting portion in embodiment 5 of the drive assembly;

FIG. 13 is an axial projection view of embodiment 6 of the drive assembly;

fig. 14a shows a first initial state of the swing arm during mounting of the process cartridge, in which the driving force receiving end is to abut against the front end of the driving shaft;

fig. 14b shows a second initial state of the swing arm during mounting of the process cartridge, in which the driving force receiving end will not abut against the front end of the driving shaft.

Fig. 15 shows a movement state when the swing arm is in contact with the drive shaft abutting portion in the process of mounting the process cartridge;

FIG. 16 shows the state of engagement of the swing arm with the recess of the drive shaft after the process cartridge is mounted in place;

fig. 17 shows a process in which the swing arm is moved out of the drive shaft recess when the process cartridge is detached;

FIG. 18 is a force analysis diagram of the swing arm being removed from the drive shaft recess;

fig. 19 shows a state after the swing arm is separated from the drive shaft recess when the process cartridge is detached.

Detailed Description

Referring to fig. 2, the process cartridge according to the embodiment of the present invention includes a photosensitive drum 20, a frame 10 rotatably supporting the photosensitive drum 20, and a driving assembly 30 connected to an axial end of the photosensitive drum 20. After the process cartridge is mounted to the electrophotographic image forming apparatus, the driving assembly 30 engages with a driving shaft 100 shown in fig. 1 in the electrophotographic image forming apparatus, and receives a driving force for rotating the photosensitive drum 20 from the driving shaft 100. Next, different structural embodiments of the driving assembly 30 will be described in detail.

Example 1

Fig. 3 to 5 show the structure of embodiment 1 of the drive assembly. As shown in fig. 3 to 5, in embodiment 1, the driving assembly 30 includes a coupling 31 having a hollow cavity, a swing arm 32 rotatably provided inside the coupling 31 about a rotation shaft 33; among them, the swing arm 32 is preferably located axially outside the photosensitive drum 20. The coupling 31 has a front end 31a and a rear end 31b in the axial direction, the rear end 31b being directly connected to the photosensitive drum 20, the front end 31a forming an opening portion 31c through which the drive shaft 100 is inserted into the coupling 31; the swing arm 32 includes an abutted end 322 and a driving force receiving end 321, the abutted end 322 being located on the front side of the driving force receiving end 321 in the axial direction of the coupling 31, and the rotating shaft 33 being located between the abutted end 322 and the driving force receiving end 321 in the axial direction of the coupling 31. The rotation shaft 33 is preferably provided in the chord direction of the coupling member 31.

As shown in fig. 5, a recessed portion 31e is formed on the inner peripheral wall 31d of the coupling member 31, and shaft holes 311 are formed on both opposite side walls of the recessed portion 31e, the shaft holes 311 being provided along the chord direction of the coupling member 31. The rotating shaft 33 may be integrally formed with the swing arm 32, and the tip of the rotating shaft 33 may be pressed into the shaft hole 311, thereby rotatably connecting the swing arm 32 to the link 31. The shaft hole 311 is formed in the recess 31e, and the diameter of the coupling 31 can be reduced, which is advantageous for the miniaturization of the driving assembly 30.

As shown in fig. 4, the gap between the shaft 33 and the shaft hole 311 is preferably set, i.e. the diameter of the shaft hole 311 is larger than that of the shaft 33, so that the shaft 33 can be shifted along the radial direction of the shaft hole 311, and the axial center 33O of the shaft 33 is correspondingly shifted from the axial center 311O of the shaft hole 311. In another embodiment not shown, a shaft hole may be formed in the swing arm 32, the rotating shaft 33 may be assembled into the shaft hole in the swing arm 32 and the shaft hole in the coupling 31, and a gap may be provided between the rotating shaft 33 and the shaft hole in the swing arm 32.

The coupling 31 has a first rotation restricting portion 312, and the first rotation restricting portion 312 is located on the rear side of the rotation shaft 33 in the axial direction of the coupling 31. Specifically, the first rotation restricting portion 312 is located in the recess 31e, and the first rotation restricting portion 312 is correspondingly recessed into the inner peripheral wall 31d of the coupling member 31 to facilitate miniaturization of the drive assembly 30. As shown in fig. 4, when the swing arm 32 abuts the first rotation restricting portion 312, the spacing d2 of the abutted end 322 from the rotation center 31O of the coupling 31 is larger than the spacing d1 of the driving force receiving end 321 from the rotation center 31O, that is, the abutted end 322 is farther from the rotation center 31O of the coupling 31 than the driving force receiving end 321. Thus, during the entry of the drive shaft 100 into the coupling member 31, the front end of the drive shaft 100 does not interfere with the abutted end 322, facilitating the entry of the drive shaft 100 into the predetermined engagement position in the coupling member 31.

The coupling 31 also has a second rotation restricting portion 313, and the second rotation restricting portion 313 is located on the front side of the rotating shaft 33 in the axial direction of the coupling 31. Specifically, the second rotation restricting portion 313 is also located in the recessed portion 31e, i.e., the second rotation restricting portion 313 is also recessed into the inner peripheral wall 31d of the coupling member 31, to facilitate miniaturization of the drive assembly 30. When the swing arm 32 abuts against the second rotation restricting portion 313, as will be described in detail later, the driving force receiving end 321 is held at the rotational driving force receiving position. In this rotational driving force receiving position, the driving force receiving end 321 enters the recess 101 of the drive shaft 100, thereby being able to receive the rotational driving force from the drive shaft 100 to rotate the coupling 31 and the photosensitive drum 20.

It should be noted that, although the structure of the driving assembly 30 is described in embodiment 1 by taking the example in which only one swing arm 32 is provided in the coupling 31, two or three swing arms 32 may be provided in the coupling 31. In the case where three swing arms 32 are provided in the coupling 31, the driving force receiving ends 321 of the three swing arms 32 can enter the three recesses 101 of the drive shaft 100, respectively, and the rotational driving force can be received from the drive shaft 100 more stably.

Example 2

As shown in fig. 6, the drive assembly 30 of embodiment 2 further includes a sleeve 34 connected to the coupling member 31, and the coupling member 31 is at least partially inserted into the sleeve 34. The sleeve 34 is directly connected to the photosensitive drum 20, and a main body portion of the sleeve 34 is disposed inside the photosensitive drum 20; the swing arm 32 is located axially outward of the photosensitive drum 20. The coupling 31 is indirectly connected to the photosensitive drum 20 through the sleeve 34, and transmits a rotational driving force to the photosensitive drum 20 through the sleeve 34.

A first elastic member 35 is provided in the sleeve 34, and the first elastic member 35 may be a spring for urging the coupling member 31 outward in the axial direction of the coupling member 31. The driving shaft 100 is inserted into the coupling 31 during the process of mounting the process cartridge to the electrophotographic image forming apparatus to generate an axial impact force on the driving assembly 30, and the first elastic member 35 can buffer the impact force applied to the driving assembly 30 by the driving shaft 100 during the process of mounting the process cartridge, thereby protecting the driving assembly 30.

Anti-deflection structure of driving assembly

As described above, the driving shaft 100 has three recesses 101 uniformly arranged along the circumferential direction thereof, and in the case where only one or two swing arms 32 are arranged inside the coupling 31, the swing arms 32 engage with one or two corresponding recesses 101 to transmit the rotational driving force, but in this case, during the rotation of the driving shaft 100, due to uneven force, the driving shaft 100 may deflect away from the swing arms 32 along the radial direction thereof, and once the magnitude of the deflection is too large, the driving force receiving end 321 of the swing arm 32 may be unhooked from the recess 101, so that the driving shaft 100 cannot further drive the driving assembly 30 to rotate.

In order to prevent the driving force receiving end 321 from coming out of the recess 101 in such a case, it is preferable to provide one or more deflection restricting portions in the coupling 31, which project from the inner peripheral wall 31d of the coupling 31 in the radial direction, so that the driving shaft 100 can be prevented from deflecting, and the driving force receiving end 321 is always held in the recess 101 of the driving shaft 100, stably receiving the rotational driving force.

The following describes in detail the drive assembly 30 provided with different deflection restricting portions with reference to embodiments 3 to 6.

Examples 3 to 4

In the drive assembly 30 according to embodiments 3 to 4, the deflection restricting portion 361 is fixedly provided on the inner peripheral wall 31d of the coupling member 31. Among them, the deflection restricting portion 361 may be integrally formed with the coupling member 31 so as to be fixedly provided on the inner circumferential wall 31d of the coupling member 31. The deflection restricting portion 361 may be fixedly connected to the coupling 31 by a connecting means such as a screw.

Fig. 7 is an axial projection view of embodiment 3 of the drive assembly. As shown in fig. 7, in embodiment 3, a swing arm 32 and a deflection restricting portion 361 are provided in the coupling 31 along the circumferential direction thereof, and the deflection restricting portion 361 is annularly distributed along the inner circumference of the coupling 31, and the surrounding angle is preferably more than 180 degrees. As shown in fig. 8, the axially outer side of the deflection restricting portion 361 has a guide slope 3611 to facilitate the entry of the drive shaft 100 into a predetermined engagement position in the coupling 31. It is easily understood that, in the case of one swing arm 32, a plurality of deflection restricting portions 361 may also be provided in the coupling 31.

Fig. 9 is an axial projection view of drive assembly embodiment 4. As shown in fig. 9, in embodiment 4, two swing arms 32 and one deflection restricting portion 361 are provided in the coupling 31 along the circumferential direction thereof, and the two swing arms 32 and the one deflection restricting portion 361 are distributed along the circumferential direction of the coupling 31.

Examples 5 to 6

In the drive assembly 30 according to embodiments 5 to 6, the inner peripheral wall 31d of the coupling member 31 is provided with the deflection restricting portion 362, and the deflection restricting portion 362 is movably connected to the coupling member 31. The drive assembly 30 further includes a second elastic element 363 that urges the deflection restricting portion 362 radially inward of the coupling 31, and the second elastic element 363 may be a spring. Further, a stopper may be provided in the coupling 31, and the stopper may abut against the deflection restricting portion 362 for controlling the projecting position of the deflection restricting portion 362 in the radial direction of the coupling 31.

Fig. 10 is an axial projection view of drive assembly embodiment 5. As shown in fig. 10, in embodiment 5, one deflection restricting portion 362 and two swing arms 32 are provided in the coupling 31 along the circumferential direction thereof, and the three are distributed along the circumferential direction of the coupling 31, so that the deflection of the drive shaft 100 can be restricted.

Fig. 11 and 12 show a specific structure of the deflection restricting portion 362 and the second elastic element 363, and an assembling step thereof. Specifically, the deflection restricting portion 362 includes a main body portion 3620 protruding from the inner peripheral wall of the coupling 31, and a mounting seat 3622 connected to the main body portion 3620, and a guide inclined surface 3621 is formed on the axially outer side of the main body portion 3620; the mounting seat 3622 is T-shaped and has a receiving cavity 3623, and the second elastic element 363 is disposed in the receiving cavity 3623. The inner circumferential wall of the coupling member 31 is provided with a mounting groove 314 and a guide groove 315, and the guide groove 315 is T-shaped with one end communicating with the mounting groove 314 and the other end extending to the opening portion of the coupling member 31.

The deflection limiting part 362 and the second elastic element 363 are installed to the installation groove 314 through the guide slot 315, and when the installation seat 3622 passes through the guide slot 315, the second elastic element 363 is compressed in the receiving cavity 3623 of the installation seat 3622; after the mounting seat 3622 enters the mounting groove 314, one end of the second elastic member 363 is ejected from the accommodation cavity 3623 to abut against the bottom wall of the mounting groove 314, thereby pushing the deflection restricting portion 362 inward in the radial direction of the coupling member 31.

FIG. 13 is an axial projection view of embodiment 6. As can be seen from fig. 13, embodiment 6 differs from embodiment 5 in that two deflection restricting portions 362 and one swing arm 32 are provided in the coupling 31 in embodiment 6 along the circumferential direction thereof.

Coupling process of swing arm and drive shaft

The engaging process of the swing arm 32 and the drive shaft 100 when the process cartridge is mounted to the electrophotographic image forming apparatus is explained with reference to fig. 14a to 16. As shown in fig. 14a, when the swing arm 32 is in a position contacting the second rotation restricting portion 313 after the drive shaft 100 enters the coupling 31, the drive shaft 100 first abuts against the driving force receiving end 321 of the swing arm 32 after entering the coupling 31, so that the swing arm 32 rotates in the direction R1, the driving force receiving end 321 retreats to the outside in the radial direction of the coupling 31, and the front end of the drive shaft 100 can pass over the driving force receiving end 321. As shown in fig. 14b, when the swing arm 32 is in a position contacting the first rotation restricting portion 312, the front end of the drive shaft 100 does not abut against the driving force receiving end 321 of the swing arm 32 after the drive shaft enters the coupling 31.

As shown in fig. 15, after the front end of the drive shaft 100 passes over the driving force receiving end 321 of the swing arm 32, as the drive shaft 100 continues to enter the coupling 31, the tapered surface 1021 of the abutment portion 102 abuts against the abutted end 322 of the swing arm 32, so that the swing arm 32 rotates in the direction R2, and the driving force receiving end 321 rotates radially inward of the coupling 31.

As shown in fig. 16, when the drive shaft 100 reaches the predetermined engagement position in the coupling 31, the swing arm 32 rotates in the R2 direction to abut against the second rotation restricting portion 313, and the drive force receiving end 321 rotates radially inward of the coupling 31 to enter the recessed portion 101. The swing arm 32 is thereafter sandwiched by the abutting portion 102 and the second rotation restricting portion 313, the rotation of the swing arm 32 about the rotating shaft 33 is prevented, and the driving force receiving end 321 is stably held in the recess 101.

Process for separating swing arm from drive shaft

The process of separating the swing arm 32 and the drive shaft 100 when the process cartridge is detached from the electrophotographic image forming apparatus will be described with reference to fig. 17 and 19.

As shown in fig. 17, when the process cartridge is removed, the driving force receiving end 321 of the swing arm 32 abuts against the inclined surface 1011 of the recess 101 as the coupling 31 moves to the front side of the driving shaft 100. As shown in fig. 18, at this time, the inclined surface 1011 has a force T1 acting on the driving force receiving end 321 of the swing arm 32, and due to the force T2 acting between the rotating shaft 33 and the shaft hole 311, the abutted end 322 will rotate in the R1 direction about the rotating shaft 33 as shown in fig. 17 according to the transmission of the moment, and the driving force receiving end 321 rotates toward the radial outside of the coupling 31. As shown in fig. 19, as the coupling 31 continues to move to the front side of the drive shaft 100, the driving force receiving end 321 eventually moves out of the recess 101, effecting separation of the swing arm 32 from the drive shaft 100.

In summary, in the embodiment of the present invention, the driving assembly 30 includes the swing arm 32 rotatably disposed in the coupling member 31, and the swing arm 32 enters or moves out of the concave portion 101 by a rotation manner, so as to have a better structural strength even under long-term use, and stably receive the rotational driving force from the driving shaft 100. In addition, the swing arm 32 can rotate without the assistance of a return spring, and has the advantage of simple and reliable structure.

Although the present invention has been described above by way of examples, it should be understood that the above examples are merely illustrative of the possible embodiments of the present invention and should not be interpreted as limiting the scope of the present invention, i.e. all equivalent permutations or variations that can be made by those skilled in the art in accordance with the present invention are intended to be covered by the scope of the present invention as defined by the appended claims.

Claims (14)

1. A drive assembly of a cartridge, the cartridge comprising a photosensitive drum connected to the drive assembly, characterized in that the drive assembly comprises:

a coupling piece having a hollow cavity;

a swing arm rotatably provided inside the link about a rotation shaft; the swing arm includes an abutted end and a driving force receiving end, the abutted end is located on a front side of the driving force receiving end in the axial direction of the coupling, and the rotating shaft is located between the abutted end and the driving force receiving end in the axial direction of the coupling;

wherein when the abutted end receives an external abutting force to rotate to a radially outer side of the coupling, the driving force receiving end rotates to a rotational driving force receiving position to a radially inner side of the coupling, thereby being able to receive a driving force to rotate the coupling.

2. The drive assembly of claim 1, wherein: the rotating shaft is arranged in the chord direction of the connecting piece; and a gap is reserved between the rotating shaft and the shaft hole on the connecting piece and/or the shaft hole on the swing arm.

3. The drive assembly of claim 1, wherein: the coupling has a first rotation restricting portion located on a rear side of the rotation shaft in an axial direction of the coupling; when the swing arm abuts against the first rotation restricting portion, the abutted end is farther from the rotation center of the coupling than the driving force receiving end.

4. The drive assembly of claim 1, wherein: the coupling member has a second rotation restricting portion located on a front side of the rotating shaft in an axial direction of the coupling member; when the swing arm abuts against the second rotation restricting portion, the driving force receiving end is held at the rotational driving force receiving position.

5. The drive assembly of claim 1, wherein: the drive assembly further includes a sleeve connected to the coupling, the coupling being at least partially inserted into the sleeve, and a first resilient element disposed within the sleeve, the first resilient element urging the coupling outward in an axial direction of the coupling.

6. A cartridge for mounting in an electrophotographic image forming apparatus including a drive shaft having a concave portion and an abutting portion, the concave portion being located on a front side of the abutting portion in an axial direction of the drive shaft; the cartridge includes:

a frame;

a rotating member provided on the frame;

a drive assembly coupled to the rotating member for receiving a drive force from the drive shaft to rotate the rotating member;

the method is characterized in that: the drive assembly includes a coupling into which the drive shaft is inserted, a swing arm rotatably provided inside the coupling about a rotational shaft, the swing arm including an abutted end and a driving force receiving end, the abutted end being located on a front side of the driving force receiving end in an axial direction of the coupling, the rotational shaft being located between the abutted end and the driving force receiving end in the axial direction of the coupling; the abutted end can be abutted by the abutting portion, so that the swing arm rotates to move the driving force receiving end into the concave portion.

7. The cartridge of claim 6, wherein: the rotating shaft is arranged in the chord direction of the connecting piece; and a gap is reserved between the rotating shaft and the shaft hole on the connecting piece and/or the shaft hole on the swing arm.

8. The cartridge of claim 6, wherein: the coupling has a first rotation restricting portion located on a rear side of the rotation shaft in an axial direction of the coupling; when the swing arm abuts against the first rotation restricting portion, the abutted end is farther from the rotation center of the coupling than the driving force receiving end.

9. The cartridge of claim 6, wherein: the coupling member has a second rotation restricting portion located on a front side of the rotating shaft in an axial direction of the coupling member; after the driving force receiving end moves into the recess, the swing arm is held by the second rotation restricting portion and the abutting portion to prevent the swing arm from rotating around the rotating shaft.

10. The cartridge of claim 6, wherein: the drive assembly further includes a sleeve connected to the rotary member, the coupling being at least partially inserted into the sleeve, and a first resilient element disposed within the sleeve, the first resilient element urging the coupling outward in an axial direction of the coupling.

11. The cartridge of claim 6, wherein: one or more deflection limiting parts for limiting the deflection of the driving shaft are convexly arranged on the inner peripheral wall of the coupling, and the swing arm and the deflection limiting parts are arranged along the circumferential direction of the coupling.

12. The cartridge of claim 11, wherein: the deflection restricting portion is fixedly provided on an inner peripheral wall of the coupling.

13. The cartridge of claim 11, wherein: the deflection limiting portion is movably connected with the coupling member, and the driving assembly further comprises a second elastic element which pushes the deflection limiting portion inwards in the radial direction of the coupling member.

14. The cartridge of claim 6, wherein: the rotating member is a photosensitive drum, and the swing arm is located on the axial outer side of the photosensitive drum.

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