CN220455673U - Processing box - Google Patents

Abstract

The utility model discloses a processing box, which is detachably installed in an electronic imaging device, comprising: the end cover is provided with an arc-shaped positioning part; the drum unit is fixedly connected with the end cover and rotatably supports the photosensitive drum; the developing unit is movably connected with the end cover and is provided with a developing coupler and a developing roller, and the developing coupler receives the driving force of the electronic imaging equipment to drive the developing roller to rotate; and a projection on the developing unit connected to the arc-shaped positioning portion, the projection being movable within the range of the arc-shaped positioning portion to move the developing unit relative to the drum unit between a first position and a second position. The processing box provided by the utility model has the advantages that the protruding part is matched with the arc-shaped positioning part, so that the freedom degree of movement of the developing unit is increased, the position of the developing unit can be conveniently and freely adjusted in the printing process, the contact or separation effect of the developing roller and the photosensitive drum is better, and the stability of the printing quality is improved.

Description

Processing box

Technical Field

The utility model relates to the technical field of electronic imaging equipment, in particular to a processing box.

Background

The positioning mode of the existing processing box generally adopts a positioning part (positioning hole) arranged on a developing bearing of a developing unit, a developing coupler on the developing unit penetrates through the positioning hole and is connected with a connecting hole on an end cover, and the developing unit moves under the support of the positioning hole and the connecting hole, so that a developing roller rotates around the positioning hole to contact a photosensitive drum. This positioning completely limits the freedom of movement of the developing unit, and does not facilitate free adjustment of the position of the developing unit during printing.

Disclosure of Invention

According to an aspect of the present utility model, there is provided a process cartridge detachably mountable to an electronic imaging device, comprising:

the end cover is provided with an arc-shaped positioning part;

the drum unit is fixedly connected with the end cover, a photosensitive drum is rotatably supported on the drum unit, and one end of the photosensitive drum is provided with a photosensitive coupler for receiving the driving force of the electronic imaging equipment to drive the photosensitive drum to rotate;

the developing unit is movably connected with the end cover and is provided with a developing coupler and a developing roller, and the developing coupler receives the driving force of the electronic imaging equipment to drive the developing roller to rotate;

a projection on the developing unit connected to the arc positioning portion, the projection being movable within the range of the arc positioning portion to move the developing unit relative to the drum unit between a first position and a second position; the developing roller is in contact with the photosensitive drum at the first position; in the second position, the developing roller is separated from the photosensitive drum.

In some embodiments, an arc center of the arc positioning portion is directed toward a rotation axis of the developing coupling.

In some embodiments, the arc center of the arc positioning portion is disposed coaxially with the rotational axis of the developing coupling.

In some embodiments, the number of arcuate positioning portions is at least two.

In some embodiments, the two arc-shaped positioning portions are located on the upper side and the lower side of the rotation axis of the developing coupling, respectively.

In some embodiments, the end cover is provided with a through hole and a notch, the photosensitive coupling is at least partially exposed from the through hole, the developing coupling is at least partially exposed from the notch, and the developing coupling and the end cover have no contact part.

In some embodiments, one end of the developing unit is fixedly provided with a developing bearing, and the protruding portion is provided on the developing bearing.

In some embodiments, the developing coupling is rotatably fixedly mounted on the developing bearing.

In some embodiments, the developing unit is provided with a force receiving component, and the force receiving component can receive the separating force of the electronic imaging device to drive the developing unit to move from a first position to a second position;

the protruding portion moves from one end to the other end of the arc-shaped positioning portion in the process that the developing unit moves from the first position to the second position.

In some embodiments, the force receiving member is movably disposed to the developing unit.

The utility model has the beneficial effects that: the processing box provided by the utility model has the advantages that the protruding part is matched with the arc-shaped positioning part, so that the freedom degree of movement of the developing unit is increased, the position of the developing unit can be conveniently and freely adjusted in the printing process, the contact or separation effect of the developing roller and the photosensitive drum is better, and the stability of the printing quality is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of a process cartridge according to some embodiments of the present utility model at one angle;

FIG. 2 is a schematic view of the overall structure of a process cartridge according to another aspect of some embodiments of the present utility model;

FIG. 3 is a partially exploded view of a process cartridge according to some embodiments of the present utility model;

FIG. 4 is a schematic view of a development bearing of a process cartridge according to some embodiments of the present utility model;

FIG. 5 is a schematic view of a drive side end cap of a process cartridge according to some embodiments of the present utility model;

fig. 6 is a schematic view illustrating a structure of a process cartridge according to still another aspect of some embodiments of the present utility model.

Detailed Description

The present utility model will now be described in further detail with reference to the accompanying drawings, wherein the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and include, for example, either fixedly attached, detachably attached, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the above description, descriptions of the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The description of the orientation in the following description is specified as:

a1 and A2 are first directions, the direction indicated by A1 is the positive direction of the first direction, the direction indicated by A2 is the negative direction of the first direction, and the first direction is defined as the length direction of the processing box;

the directions B1 and B2 are second directions, the direction B1 refers to the positive direction of the second direction, the direction B2 refers to the negative direction of the second direction, and the second direction is defined as the width direction of the processing box;

the directions C1 and C2 are the third direction, the direction C1 is the positive direction of the third direction, the direction C2 is the negative direction of the third direction, and the third direction is defined as the height direction of the processing box.

The first direction, the second direction, and the third direction intersect each other.

An electrophotographic image forming apparatus forms an image on a recording material using, for example, an electrophotographic image forming process. The electrophotographic image forming apparatus includes, for example, an electrophotographic copying machine, an electrophotographic printer (LED printer, laser printer, etc.), a facsimile machine of the electrophotographic printer type, and the like. The process cartridge is detachably mounted in an electronic image forming apparatus, and includes a photosensitive drum, a developing roller for developing an electrostatic latent image formed on the photosensitive drum, and the like. The electronic image forming apparatus includes a driving head for transmitting a driving force of the electronic image forming apparatus to the process cartridge to operate the process cartridge.

As shown in fig. 1 and 2, the present embodiment provides a process cartridge including a developing unit 100, a drum unit 200, and a driving assembly, the developing unit 100 including a developing frame, a developing roller, a powder feeding roller, and a powder discharging blade, the drum unit 200 including a photosensitive frame 210, an end cap, a photosensitive drum, a charging roller, and a cleaning blade. The process cartridge is substantially in the shape of a rectangular parallelepiped having a length in a first direction (A1 and A2 directions), a width in a second direction (B1 and B2 directions), and a height in a third direction (C1 and C2 directions); the one end of the process cartridge in the A1 direction is the driving end, the one end in the A2 direction is the conductive end, the developing unit 100 and the drum unit 200 are oppositely arranged in the second direction, the direction from the developing unit 100 toward the drum unit 200 is the B1 direction, the one end of the process cartridge in the B1 direction is the front end, the direction from the drum unit 200 toward the developing unit 100 is the B2 direction, the one end in the B2 direction is the rear end, the one end of the process cartridge in the C1 direction is the upper end, and the one end in the C2 direction is the lower end.

As shown in fig. 1 and 2, the developing frame includes a hopper holder 110 enclosing a hopper for storing toner, the hopper holder 110 is substantially in the shape of a long-strip box, the longitudinal direction of the hopper holder 110 extends in a first direction (A1 and A2 direction), the developing frame further includes developing bearings 120 and conductive side holders provided at both ends of the hopper holder 110 in the longitudinal direction (A1 and A2 direction), respectively, and the toner feeding roller and the developing roller are rotatably supported on the developing bearings 120 and conductive side holders at both ends of the developing frame in the longitudinal direction, and the toner feeding roller and the developing roller are rotatable by a driving assembly, and the axial directions of the toner feeding roller and the developing roller are both along the longitudinal direction (first direction) of the developing frame.

As shown in fig. 1 and 2, the photosensitive frame 210 encloses a waste powder bin for collecting waste powder, the photosensitive frame 210 also has a length direction, the length direction of which is identical to the length direction of the developing frame (both along A1 and A2 directions), and both ends of the photosensitive frame 210 in the first direction are provided with end caps, respectively a driving side end cap 220 fixedly disposed at one end of the photosensitive frame 210 in the A1 direction and a conductive side end cap 230 fixedly disposed at one end of the photosensitive frame 210 in the A2 direction. The photosensitive drum is rotatably supported on the driving-side end cap 220 and the conductive-side end cap 230, and specifically, the photosensitive drum is disposed on the lower end side (C2-direction side) of the photosensitive frame 210 in the height direction. The toner adsorbed by the developing roller transfers the toner to the photosensitive drum through the potential difference between the developing roller and the photosensitive drum, and the toner on the photosensitive drum is transferred through a transfer belt of the electronic imaging device to form an image on a recording material (such as paper). After transfer printing, the cleaning scraper is in linear contact with the photosensitive drum, so that the toner which is not completely transferred on the surface of the photosensitive drum is cleaned, namely waste toner, and the cleaned waste toner is stored in a waste toner bin. The charging roller is used for charging the surface of the photosensitive drum with uniform charges, so that the photosensitive drum can adsorb carbon powder.

As shown in fig. 1 to 3, the driving assembly includes a photosensitive coupling 310, a developing coupling 320, a developing roller gear 330 and a powder feeding roller gear 340, and the driving assembly may be disposed at one end or both ends of the process cartridge in the first direction (length direction), in this embodiment, the driving assembly is disposed at the same end of the developing unit 100 in the length direction, i.e., the driving end (one end in the A1 direction). The photosensitive coupling 310 is disposed at one end of the photosensitive drum in the A1 direction, and is configured to engage with a photosensitive driving head of the electronic imaging device to receive a driving force and drive the photosensitive drum to rotate. The developing coupling 320, the developing roller gear 330, and the powder feeding roller gear 340 are disposed outside the developing bearing 120, the developing coupling 320 is for engaging with a developing driving head of the electronic imaging device and receiving a driving force, and the developing coupling 320 is located at a position substantially in the middle of the developing unit 100 in the third direction; the developing roller gear 330 is sleeved at one end of the shaft of the developing roller, which extends out of the developing bearing 120, the powder feeding roller gear 340 is sleeved at one end of the shaft of the powder feeding roller, which extends out of the developing bearing 120, and the developing roller gear 330 and the powder feeding roller gear 340 are directly or indirectly meshed with the developing coupling 320, so that the developing coupling 320 transmits the received driving force, and the developing roller and the powder feeding roller are driven to rotate. In the third direction, the developing coupling 320 is located on the upper side (C1 direction side) of the photosensitive coupling 310.

As shown in fig. 3, the developing coupling 320 is rotatably and fixedly mounted on the developing bearing 120, specifically, a mounting portion 121 is provided on the outer side (the side facing away from the powder bin bracket 110) of the developing bearing 120, the developing coupling 320 includes a connecting portion 321 and a gear portion 322, the connecting portion 321 and the gear portion 322 are separately provided, the gear portion 322 is sleeved on the mounting portion of the developing bearing 320, and the fastener 600 passes through the gear portion 322 from the inside of the gear portion 322 to fixedly connect the gear portion 322 to the mounting portion 121 of the developing bearing 120. The fastener 600 may be a pin, screw, bolt, or the like. After the gear portion 322 is mounted on the developing bearing 120, the connecting portion 321 is engaged with and connected to an end of the gear portion 322 away from the developing bearing 120, and when the connecting portion 321 receives the driving force of the electronic imaging device to rotate, the gear portion 322 is driven to synchronously rotate so as to transmit the driving force.

As shown in fig. 3, the driving-side end cap 220 is provided with a through hole 221 and a notch 222, and when the driving-side end cap 220 is mounted on the end of the photosensitive frame 210, a portion of the photosensitive coupling 310 is exposed through the through hole 221 and a portion of the developing coupling 320 is exposed through the notch 222, so that the coupling is engaged with the driving head of the electrophotographic apparatus to receive driving force. The notch 222 extends upward and rearward from a position corresponding to the developing coupling 320 to the upper and rear ends of the driving-side cap 220, i.e., a hollow portion is provided in the driving-side cap 220, and friction is not generated between the developing coupling 320 and the driving-side cap 220 when the developing coupling 320 rotates.

As shown in fig. 3 and 4, since the notch 222 is formed on the driving-side end cover 220, the driving-side end cover 220 cannot protect the developing coupling 320, and therefore the developing bearing 120 is further provided with the tooth protecting portion 124, the tooth protecting portion 124 is located at a side of the developing bearing facing away from the powder bin bracket 110, the tooth protecting portion 124 is an arc-shaped protrusion or an L-shaped protrusion protruding along the A1 direction, and the tooth protecting portion 124 is located at a rear upper side of the gear portion 322, so that a part of the gear portion 322 can be covered, and the gear portion 322 can be better protected.

In the working process of the electronic imaging equipment, the developing roller and the photosensitive drum need to be in tight contact, when the electronic imaging equipment does not work, the developing roller and the photosensitive drum need to be separated by a certain distance, and the problems that the photosensitive drum is polluted by redundant developer attached to the developing roller or the developing roller deforms or the photosensitive drum is worn and the like due to long-time contact of the developing roller and the photosensitive drum are avoided.

Based on this, the drum unit 200 and the developing unit 100 in the present embodiment are provided to be relatively movable, so that the developing roller and the photosensitive drum can be brought into contact when the electronic image forming apparatus is operated and separated when not operated. When the process cartridge is mounted in the electronic image forming apparatus, the drum unit 200 abuts against a member in the electronic image forming apparatus, the drum unit 200 is not movable, the developing unit 100 is provided to be movable relative to the drum unit 200 between a first position at which the developing roller is in contact with the photosensitive drum, and a second position at which the developing unit 100 is in the first position; when the developing unit 100 is at the second position, the developing roller is separated from the photosensitive drum.

As shown in fig. 2 to 6, in the present embodiment, the process cartridge further includes an arc-shaped positioning portion, a protruding portion, a force receiving member 400, and an elastic member 500 for effecting movement of the developing unit 100 relative to the drum unit 200 between a first position and a second position; in the first position, the developing roller is in contact with the photosensitive drum; in the second position, the developing roller is separated from the photosensitive drum.

As shown in fig. 2, 3, 5 and 6, in the present embodiment, the arc positioning portions and the protruding portions are matched to enable the developing unit 100 to move relative to the drum unit, the arc positioning portions are disposed on the driving side end cover 220, the number of the arc positioning portions is at least two, the process cartridge of the present embodiment adopts two arc positioning portions, the two arc positioning portions are a first arc positioning portion 223 and a second arc positioning portion 224, respectively, and in the third direction, the first arc positioning portion 223 and the second arc positioning portion 224 are located on the upper side and the lower side of the rotation axis of the developing coupling 320, respectively.

As shown in fig. 2, 3, 5 and 6, in the present embodiment, the first arc positioning portion 223 is an arc hole or an arc slot formed on the driving side end cover 220, and the first arc positioning portion 223 is disposed near the upper edge of the notch portion 222, i.e. at the upper end of the driving side end cover 220 and beside the notch portion 222. The arc center of the first arc positioning portion 223 is directed to the rotation axis of the developing coupling 320, and more preferably, the arc center of the first arc positioning portion 223 is disposed coaxially with the rotation axis of the developing coupling 320.

As shown in fig. 2, 3, 5 and 6, in the present embodiment, the second arc positioning portion 224 is also an arc hole or an arc slot formed on the driving side end cover 220, the second arc positioning portion 224 is disposed near the lower end of the driving side end cover 220 in the third direction, and the second arc positioning portion 224 is located below the notch portion 222 in the third direction. The arc center of the second arc positioning portion 224 is directed to the rotation axis of the developing coupling 320, and more preferably, the arc center of the second arc positioning portion 224 is disposed coaxially with the rotation axis of the developing coupling 320.

As shown in fig. 6, the first and second arc-shaped positioning portions 223 and 224 and the notch portion 222 do not have overlapping portions, as viewed in the direction of the rotation axis of the developing coupling 320.

As shown in fig. 2 to 4 and 6, in this embodiment, the protruding portions are used to cooperate with the arc positioning portions, and the number of protruding portions is adapted to the number and positions of the arc positioning portions, so that in the process cartridge adopting two arc positioning portions in this embodiment, two protruding portions are correspondingly provided, namely, the first protruding portion 122 and the second protruding portion 123. The first protrusion 122 and the second protrusion 123 are cylindrical members formed on the side of the developing bearing 120 facing away from the cartridge holder 110, and preferably have a cylindrical shape, but may have other polygonal prism structures. The first protrusion 122 is disposed near an upper end of the developing bearing 120 in the third direction, and the second protrusion 123 is disposed near a lower end of the developing bearing 120 in the third direction. When assembled, the first protruding portion 122 is embedded into the first arc-shaped positioning portion 223, the second protruding portion 123 is embedded into the second arc-shaped positioning portion 224, and the first protruding portion 122 and the second protruding portion 123 can move within the range of the first arc-shaped positioning portion 223 and the second arc-shaped positioning portion 224, respectively, that is, the range of the arc-shaped positioning portions defines the movement range of the protruding portions, that is, the range of the swing of the developing unit 100 relative to the photosensitive unit 200 is limited.

When the developing unit 100 is positioned at the first position, the lower end of the developing unit 100 is close to the lower end of the drum unit 200, so that the developing roller can be contacted with the photosensitive drum, and the protruding part is positioned at one end in the arc-shaped positioning part; when the developing unit 100 is moved from the first position to the second position by the force of the electrophotographic apparatus, the protruding portion moves from one end to the other end in the arc-shaped positioning portion, and the lower end of the developing unit 100 swings in a direction away from the drum unit 200 (substantially in the B2 direction), driving the developing roller to separate from the photosensitive drum, while the upper end of the developing unit 100 swings in a direction approaching the drum unit 200 (substantially in the B1 direction).

As shown in fig. 2, 3 and 6, the movement of the developing unit 100 from the first position to the second position is achieved by the cooperation of the force receiving member 400 and the force application member in the electronic imaging device. Specifically, the developing unit 100 is provided with a force receiving member 400 at one or both ends in the length direction, the force receiving member 400 is movably disposed on an end surface of the developing unit 100, specifically, the force receiving member 400 is movably disposed on an end surface of the developing bearing 120 facing away from the cartridge holder 110, the force receiving member 400 is a block member, at least a portion of which protrudes from a lower surface of the process cartridge, so that the force applying member contacts with the process cartridge from below, a separating force is applied thereto, and the force receiving member 400 can move in the first direction, so that the force applying member is avoided during the process of mounting the process cartridge to the electronic imaging device, and damage caused by interference and collision of the force receiving member and the process cartridge is avoided. The force receiving member 400, upon receiving the force of the force applying member, moves the developing unit 100 from the first position to the second position in a direction away from the drum unit 200, separating the developing roller from the photosensitive drum.

As shown in fig. 2, an elastic member 500 is further disposed between the drum unit 200 and the developing unit 100, for moving the developing unit 100 from the second position to the first position, and driving the developing roller to contact the photosensitive drum. Specifically, one end of the elastic member 500 is connected to the upper end of the photosensitive frame 210, and the other end is connected to the upper end of the powder bin bracket 110. The elastic member 500 is preferably a spring, and may be a member capable of providing elastic force, such as elastic rubber, elastic sponge, or elastic sheet.

As shown in fig. 1 to 6, when the electrophotographic apparatus is not in operation, the force application member contacts the force receiving member 400 from below and applies a separation force thereto, the separation force acts on the entire developing unit 100 through the force receiving member 400, the developing unit 100 rotates in the counterclockwise direction D1 (counterclockwise direction as viewed from the angle of the drawing), the lower end thereof swings in a direction away from the drum unit 200 (substantially in the B2 direction), the developing roller is driven to separate from the photosensitive drum, and the upper end of the developing unit 100 moves in a direction approaching the photosensitive drum (substantially in the B1 direction), compressing the elastic member 500. Meanwhile, the protruding portion moves from one end to the other end in the arc-shaped positioning portion, and after the protruding portion abuts against the other end of the arc-shaped positioning portion, the movement of the developing unit 100 with respect to the drum unit 200 is stopped.

As shown in fig. 1 to 6, when the electrophotographic apparatus needs to operate, the force applied to the force receiving member 400 by the force applying member is removed, the elastic member 500 elastically deforms and returns, and the developing unit 100 is pushed to move from the second position to the first position in the clockwise direction D2, and the developing roller is brought into contact with the photosensitive drum. At the same time, the other end of the protruding part in the arc-shaped positioning part returns to one end.

The cooperation of arc location portion and protruding portion plays location and support at drum roller separation/contact's in-process, through the cooperation of both, has increased the degree of freedom of developing unit 100 motion, and the developing unit 100 of being convenient for is in printing in-process free adjustment position, and the effect of developing roller and photosensitive drum's contact or separation is better, improves the stability of printing quality.

What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims (10)

1. A process cartridge detachably mountable to an electronic image forming apparatus, comprising:

the end cover is provided with an arc-shaped positioning part;

the drum unit is fixedly connected with the end cover, a photosensitive drum is rotatably supported on the drum unit, and one end of the photosensitive drum is provided with a photosensitive coupler for receiving the driving force of the electronic imaging equipment to drive the photosensitive drum to rotate;

the developing unit is movably connected with the end cover and is provided with a developing coupler and a developing roller, and the developing coupler receives the driving force of the electronic imaging equipment to drive the developing roller to rotate;

a projection on the developing unit connected to the arc positioning portion, the projection being movable within the range of the arc positioning portion to move the developing unit relative to the drum unit between a first position and a second position; the developing roller is in contact with the photosensitive drum at the first position; in the second position, the developing roller is separated from the photosensitive drum.

2. A process cartridge according to claim 1, wherein an arc center of said arc positioning portion is directed toward a rotation axis of said developing coupling.

3. A process cartridge according to claim 2, wherein an arc center of said arc positioning portion is disposed coaxially with a rotation axis of said developing coupling.

4. A process cartridge according to claim 3, wherein the number of said arc-shaped positioning portions is at least two.

5. A process cartridge according to claim 4, wherein two of said arc-shaped positioning portions are respectively located on an upper side and a lower side of a rotation axis of the developing coupling.

6. A process cartridge according to any one of claims 1 to 5, wherein said end cap is provided with a through hole and a notched portion, said photosensitive coupling is at least partially exposed from said through hole, said developing coupling is at least partially exposed from said notched portion, and said developing coupling has no contact portion with said end cap.

7. A process cartridge according to any one of claims 1-5, wherein one end of said developing unit is fixedly provided with a developing bearing, and said projection is provided on said developing bearing.

8. A process cartridge according to claim 7, wherein said developing coupling is rotatably fixedly mounted on said developing bearing.

9. A process cartridge according to any one of claims 1-5, wherein said developing unit is provided with a force receiving member capable of receiving a separating force of said electrophotographic apparatus to move said developing unit from a first position to a second position;

the protruding portion moves from one end to the other end of the arc-shaped positioning portion in the process that the developing unit moves from the first position to the second position.

10. A process cartridge according to claim 9, wherein said force receiving member is movably provided to said developing unit.