CN106886142B - Process cartridge and image forming apparatus - Google Patents
Process cartridge and image forming apparatus Download PDFInfo
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- CN106886142B CN106886142B CN201710056851.1A CN201710056851A CN106886142B CN 106886142 B CN106886142 B CN 106886142B CN 201710056851 A CN201710056851 A CN 201710056851A CN 106886142 B CN106886142 B CN 106886142B
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- force
- unit
- receiving member
- force receiving
- process cartridge
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit
- G03G21/1839—Means for handling the process cartridge in the apparatus body
- G03G21/1842—Means for handling the process cartridge in the apparatus body for guiding and mounting the process cartridge, positioning, alignment, locks
Abstract
The invention provides a processing box and an image forming device, and belongs to the technical field of image forming. A process cartridge detachably mountable to an image forming apparatus, the process cartridge comprising: a light sensing unit; a rotating body contactable with or separable from the photosensitive unit; a support portion rotatably supporting the mounting rotating body; a position switching mechanism mounted on the support part for driving the photosensitive unit to contact or separate from the rotating body; the position switching mechanism includes a holding unit including a first force application member and a force receiving member, and a movable unit including a first force receiving member, one end of the rotating body being connected to the movable unit, the first force application member contacting and applying a force to the first force receiving member when the force receiving member receives an external force to rotate the holding unit, the movable unit being pushed to slide in a first direction, thereby contacting the photosensitive unit with the rotating body. The present invention solves the problems of contamination and deformation of the photosensitive unit and the rotating body by adopting the above-described simple structure.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to an electrophotographic image forming apparatus, and a process cartridge detachably mountable to the image forming apparatus.
[ background of the invention ]
An electrophotographic image forming apparatus is a device that forms an image on a recording material using an electrophotographic image forming system. Electrophotographic image forming apparatuses include electrophotographic copying machines, electrophotographic printers (e.g., laser beam printers, LED printers, etc.), facsimile machines, word processors, and the like.
The process cartridge of the electrophotographic image forming apparatus includes at least a photosensitive unit (e.g., a photosensitive drum), a charging unit (e.g., a charging roller), an exposing unit, a developing unit (e.g., a developing roller), and a cleaning unit (e.g., a cleaning roller).
A process cartridge using the contact image forming principle is one in which a rotary (e.g., a charging roller, a developing roller, and a cleaning roller) is always kept in contact with a photosensitive drum regardless of whether the process cartridge is in an operating state or a non-operating state. When the process cartridge is in a non-operating state for a long period of time, for example, during transportation and distribution, if the rotary body and the photosensitive drum are kept in a contact position for a long period of time, the rotary body is deformed, and the coating on the surface of the photosensitive drum may be contaminated by substances on the surface of the rotary body. On the other hand, if the process cartridge is strongly impacted during transportation, the photosensitive drum and the rotary body may be pressed against each other to cause deformation or breakage, eventually affecting the image forming quality of the process cartridge.
In order to solve the above-mentioned problems, there is known a technique in which, for example, in chinese patent application publication CN101147102A, a cam member is provided so that the developing roller and the photosensitive drum are spaced from each other during a non-image forming operation of the process cartridge, but the above-mentioned control operation requires a sensor to be provided to detect a rotation angle of the movable member and also requires a drive input portion to rotate the movable member, and therefore, this structure introduces a large number of parts, complicates the structure, and increases the cost.
[ summary of the invention ]
The technical problem to be solved by the invention is to provide a processing box and an image forming device with a simple-structured rotating body position switching mechanism, wherein when the processing box is transported and stored outside the image forming device, the rotating body is kept separated from a photosensitive unit, so that the damage, the pollution and the deformation of the photosensitive unit are avoided, and the image forming quality is ensured; and during operation, the rotating body is kept in contact with the photosensitive unit.
In order to solve the above-described technical problem, the present invention provides a process cartridge detachably mountable to an image forming apparatus, comprising: a light sensing unit; a rotary body contactable with or separable from the photosensitive unit; a support portion for rotatably supporting and mounting the rotating body; a position switching mechanism mounted on the supporting part for driving the photosensitive unit to contact or separate from the rotating body; wherein the position switching mechanism includes: a holding unit rotatably mounted on the support portion, the holding unit being provided with a first urging member and a force receiving member; a movable unit slidably mounted on the support portion, the movable unit being provided with a first force receiving member, one end of the rotating body being connected to the movable unit; when the force receiving component is acted by external force, the holding unit rotates to drive the first force application component to contact and apply force to the first force application component, the movable unit slides along the first direction under the action of the external force, and therefore the rotating body is contacted with the photosensitive unit.
The invention also provides an image forming apparatus, in which a processing box is detachably arranged, the processing box comprises a rotating body and a photosensitive unit which can be contacted with or separated from each other, a supporting part and a position switching mechanism arranged on the supporting part; wherein the position switching mechanism includes: a holding unit rotatably mounted on the support portion, the holding unit being provided with a first urging member and a force receiving member; a movable unit slidably mounted on the support portion, the movable unit being provided with a first force receiving member, one end of the rotating body being connected to the movable unit; the image forming apparatus includes: a frame body; the driving mechanism is arranged on the frame body and used for driving the holding unit to rotate; in a process in which the process cartridge is mounted to the image forming apparatus, the driving mechanism applies an urging force to the force receiving member, the holding unit rotates, the first urging member is urged to contact and apply a force to the first force receiving member, the movable unit slides in a first direction by the urging force, and the rotating body comes into contact with the photosensitive unit.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a sectional view showing the overall structure of an image forming apparatus of the present invention;
FIG. 2 is a schematic view showing the mounting of the position switching mechanism to the side cover;
FIGS. 3a and 3b are views showing the construction of both sides of the holding unit, respectively;
FIGS. 4a, 4b show the structural views of the two sides of the movable unit, respectively;
FIGS. 5a and 5b show the fitting of the holding unit with the movable unit in two different states, respectively;
fig. 6 is a schematic view showing the structure of a second embodiment of the position switching mechanism;
fig. 7a to 7d are schematic views showing the operation of mounting and dismounting the process cartridge in the image forming apparatus, respectively.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
Fig. 1 is a sectional view showing the overall structure of an image forming apparatus of the present invention. An image forming apparatus 10 of the present invention includes a sheet feeding unit 1, a sheet conveying unit 2, an image forming unit 3, a fixing unit 4, and a discharging unit 5. Wherein the paper feeding unit 1 is used for picking up paper, the paper conveying unit 2 is used for conveying the paper in the conveying path, the image forming unit 3 is used for forming toner images on the paper, the image forming unit 3 specifically comprises an exposure device 31, a transfer device 32 and a processing box 33, wherein the exposure device 31 is used for forming electrostatic latent images on photosensitive drums of the processing box 33 through illumination, and the transfer device 32 is used for transferring the toner electrostatically adsorbed in the electrostatic latent image areas on the photosensitive drums to the paper, so that toner images are formed on the paper. The fixing unit 4 fixes a toner image on a sheet, and the discharging unit 5 discharges the sheet on which the image has been formed.
The process cartridge 33 further includes a photosensitive drum 331, a developing roller 332, a toner supply roller 333, and a charging roller 334, a container 335 for accommodating toner is formed inside the process cartridge 33, the toner in the container 335 is supplied to the developing roller 332 by the toner supply roller 333, a layer of uniform-thickness toner layer is formed on the developing roller 332 by a toner layer thickness scraper, the toner layer is then transferred to an electrostatic latent image area on the photosensitive drum 331, and finally the toner in the electrostatic latent image area is transferred to a sheet by a transfer device 32.
As can be seen from the operation principle of the process cartridge, the photosensitive drum 331 plays an important role in the image forming process, and in order to ensure the image forming quality of the process cartridge 33, the present invention is provided with the position switching mechanism 30 for driving the positional relationship between the photosensitive drum 331 and other rollers, so that the photosensitive drum 331 is kept separated from the other rollers during the transportation of the process cartridge 33, and the photosensitive drum 331 is kept in contact with the other rollers when the process cartridge 33 is mounted inside the image forming apparatus 10. The present invention is described below by the cooperation between the photosensitive drum 331 and the developing roller 332 as one of the embodiments.
The process cartridge 33 generally includes a casing and side covers which may be two different embodiments of the support portion 300, the photosensitive drum 331 and the developing roller 332 may be mounted on the casing or the side covers at the same time or on the casing and the side covers, respectively, the position of the photosensitive drum 331 is fixed with respect to the support portion 300, and the position of the developing roller 332 is movable with respect to the support portion 300. In the present embodiment, the photosensitive drum 331, the developing roller 332, and the position switching mechanism 30 are mounted on the side cover.
Fig. 2 to 5 show a structural diagram and an operational relationship diagram of the position switching mechanism 30. The position switching mechanism 30 includes a holding unit 320 and a movable unit 310, the holding unit 320 being rotatable on the support 300, the movable unit 310 being slidable on the support 300, and a developing roller 332 being rotatably mounted on the movable unit 310, the movable unit 310 being slid by rotation of the holding unit 320, thereby switching the position of the developing roller 332 so that the developing roller 332 is brought into contact with or separated from the photosensitive drum 331.
As shown in fig. 3a and 3b, the holding unit 320 is generally circular, and has a center D2, a first surface 323 and a second surface 324, and the holding unit 320 is provided with a force receiving member 321, and the force receiving member 321 can receive an external force and drive the holding unit 320 to rotate. The second surface 324 is provided with a first force application member 320a, the first force application member 320a may be an arc or an involute arc, and when the first force application member 320a is an arc, the center of the arc is not concentric with the center D2.
As shown in fig. 4a and 4b, the movable unit 310 has a circular shape as a whole, and has a center D1, a third surface 313 and a fourth surface 314, a first force receiving member 310a is provided on the third surface 313, the first force receiving member 310a has a circular arc shape, and an axial end of the developing roller 332 may be directly coupled to the fourth surface 314. However, since the developing roller 332 is kept rotating at all times when the process cartridge 33 is in operation, in order to improve the wear resistance of the movable unit 310, a sliding portion 311 may be provided on the fourth surface 314, the sliding portion 311 protruding from the fourth surface 314 and being provided with a hole 312 into which the shaft end of the developing roller 332 is fitted, the sliding portion 311 also serving to restrict the moving direction of the movable unit 310.
As shown in fig. 2, in order to allow the holding member 320 to rotate on the support 300 more stably, a recess 302 is provided in the support 300, the recess 302 has the same shape as the holding member 320, and the holding member 320 is fitted into the recess 302 and rotatable in the recess 302. Further, a limit portion 301 is disposed on the support portion 300, the limit portion 301 is located in the concave portion 302 and is in the shape of a long strip hole, two ends of the limit portion 301 are respectively provided with a first limit portion 301b and a second limit portion 301a, and a shaft end of the developing roller 332 can be directly supported and mounted in the limit portion 301 and can slide in the limit portion 301, so that the developing roller 332 and the photosensitive drum 331 are in contact with or separated from each other. However, as described above, since the sliding portion 311 is provided, the sliding portion 311 corresponds to the position-limiting portion 301 and is substantially square, as shown in fig. 2 and 4, the shaft end of the developing roller 332 is on the sliding portion 311, and the sliding portion 311 is accommodated in the position-limiting portion 301 and can drive the shaft end of the developing roller 332 to move between the first position-limiting portion 301b and the second position-limiting portion 301a of the position-limiting portion 301.
When the position switching mechanism 30 is installed, the movable unit 310 is first installed in the recess 302, the sliding portion 311 is inserted into the stopper portion 301, the second surface 324 is then opposed to the third surface 313, and the holding member 320 is inserted into the recess 302, so that the first force application member 320a and the first force receiving member 310a can be in contact with each other.
The operation principle of the position switching mechanism 30 will be described with reference to fig. 5a, when the force receiving member 321 receives an external force, the force receiving member 321 drives the holding member 320 to rotate along the arrow W direction, during the rotation of the holding member 320, the extrados surface of the first force application member 320a and the intrados surface of the first force receiving member 310a collide with each other, and as the rotation continues, the interaction force between the first force application member 320a and the first force receiving member 310a gradually increases, and the movable unit 310 is pushed by the holding member 320 to move until the friction force between the extrados surface of the first force application member 320a and the intrados surface of the first force receiving member 310a reaches the maximum value, and the relative movement between the movable unit 310 and the holding member 320 stops. Since the moving direction of the movable unit 310 is restricted by the sliding portion 311 and the stopper portion 301, it can slide only in the X direction, and since the shaft end of the developing roller 332 is mounted on the sliding portion 311, the developing roller 332 moves in the X direction, and the developing roller 332 comes into contact with the photosensitive drum 331.
The structure and the operation of the position switching mechanism 30 for bringing the developing roller 332 into contact with the photosensitive drum 331 when the process cartridge 33 is mounted to the image forming apparatus 10 are described above. In addition, in order to be able to improve the operability of the process cartridge so that the developing roller 332 can be separated from the photosensitive drum 331 when the process cartridge 33 is detached from the image forming apparatus 10, the present invention further provides an embodiment.
As shown in fig. 3b, the second surface 324 of the holding unit 320 is further provided with a second force application member 320b, as shown in fig. 4a, the third surface 313 of the movable unit 310 is further provided with a second force receiving member 310b, the second force application member 320b may be an arc or an involute arc, when the second force application member 320b is an arc, the center of the arc is not concentric with the center D2, and the second force receiving member 310b is an arc structure.
The operation principle is that, as shown in fig. 5b, when the force receiving member 321 receives a reverse force, the force receiving member 321 drives the holding member 320 to rotate along the direction of the arrow P, the second force application member 320b rotates along with the arrow P, during the rotation of the holding member 320, the extrados surface of the second force application member 320b and the intrados surface of the second force receiving member 310b are abutted against each other, and as the rotation continues, the interaction force between the second force application member 320b and the second force receiving member 310b gradually increases, the movable unit 310 is pushed by the holding member 320 to move along the direction of the arrow Y, and meanwhile, the developing roller 332 also moves along the direction Y, so that the developing roller 332 is separated from the photosensitive drum 331, until the friction force between the extrados surface of the second force application member 320b and the intrados surface of the second force receiving member 310b reaches the maximum value, and the movable unit 310 and the holding member 320 stop moving relatively, the developing roller 332 stops moving.
In the above embodiment, the contact and separation structures between the developing roller 332 and the photosensitive drum 331 are described, respectively, in which the first force application member 320a and the second force application member 320b are both circular arcs or involute arcs, the center of the circle is not concentric with the center of the circle D2, and the first force receiving member 310a and the second force receiving member 310b are both circular arcs, but the scope of the present invention is not limited thereto. For example, the first force application member 320a and the second force application member 320b may be provided in a circular arc, and the first force receiving member 310a and the second force receiving member 310b may be provided in an eccentric circular arc or an involute arc. As long as the interaction between the arcs is ensured so that the holding unit 320 pushes the movable unit 310 to move. Of course, it is possible to adopt a design without an arc shape, such as a convex or inclined surface fit, but the arc shape is preferable because it can make the contact process of the force application member and the force receiving member have a buffering distance to avoid the impact between the developing roller 332 and the photosensitive drum 331.
As shown in fig. 6, which is a structural view of the position switching mechanism according to the second embodiment of the present invention, the position switching mechanism 40 includes a holding unit 420 and a movable unit 410, the holding unit 420 has a fork shape, a lever portion 422 thereof is rotatably mounted on a supporting portion 400 through a hinge shaft 402, the fork portion thereof includes a first force application member 421a and a second force application member 421b respectively connected to the lever portion 422, and the supporting portion 400 may be a casing or a side cover of the process cartridge 33. The supporting part 400 is provided with a stopper 401 for restricting the movement of the movable unit 410, the stopper 401 has a long hole shape having a first stopper 401b and a second stopper 401a at both ends thereof, the movable unit 410 is provided at an inner side with a sliding part 411, the sliding part 411 is substantially square and slidably installed in the stopper 401 so that the movable unit 410 can slide only in the x and y directions, and the shaft end of the developing roller 332 is rotatably installed in the movable unit 410 so that the developing roller 332 moves along with the movable unit 410. The outer side surface of the movable unit 410 is provided with a force receiving member 412, the force receiving member 412 is located between the first force application member 421a and the second force application member 421b, and two side surfaces thereof are respectively subjected to the acting forces applied by the first force application member 421a and the second force application member 421b to form two force receiving surfaces. The force receiving member 412, the first force application member 421a and the second force application member 421b are preferably designed in an arc shape.
The operation principle of the position switching mechanism 40 of the present embodiment will be described in detail with reference to fig. 6. When the process cartridge 33 is mounted in the image forming apparatus 10, the lever portion 422 is subjected to an external force and swings in the w direction around the hinge shaft 402, the first force application member 421a and the second force application member 421b swing along with the swing, the second force application member 421b applies a force to the left side surface of the force receiving member 412, and pushes the force receiving member 412 and the movable unit 410 to move in the x direction in the stopper portion 401, and the movable unit 410 can slide only within a certain range due to the restriction of the second stopper portion 401 a. Meanwhile, since the developing roller 332 is mounted on the movable unit 410 so that the developing roller 332 is also moved in the x direction, the developing roller 332 is in contact with the photosensitive drum 331.
When the process cartridge 33 is removed from the image forming apparatus 10, the lever 422 is subjected to a reverse external force, swings in the p direction around the hinge shaft 402, the first force application member 421a and the second force application member 421b swing along with the swing, the first force application member 421a applies a force to the right side surface of the force application member 412, and pushes the force application member 412 and the movable unit 410 to move in the y direction in the limiting portion 401, and due to the limiting action of the first limiting portion 401b, the movable unit 410 can slide only within a certain range, so that the developing roller 332 is separated from the photosensitive drum 331.
In order to further improve the stability of the position switching mechanism and to maintain the photosensitive drum 331 and the developing roller 332 in a contact or separated state, the present invention further provides an elastic member 330, and as shown in fig. 2, in the first embodiment, two ends of the elastic member 330 are respectively mounted on the holding unit 320 and the supporting portion 300, the first protrusion 322 is disposed on the first surface 323 of the holding unit 320, the second protrusion 303 is disposed on the supporting portion and respectively connected to two ends of the elastic member 330, and when the elastic member 330 and the holding unit 320 are mounted in place, the elastic member 330 is stretched and always maintains a restoring force.
The operation of the elastic member 330 will be described in detail with reference to fig. 7a to 7 d. As shown in fig. 7a and 7b, before the process cartridge 33 is mounted in the image forming apparatus 10, the photosensitive drum 331 and the developing roller 332 are separated from each other and maintained at a distance d, the force receiving member 321 is located near the front end of the process cartridge 33, and at the first protrusion 322, the elastic member 330 generates a restoring force F1 inclined rearward, and the force F1 forms a component force upward and leftward, and the component force upward is greater than the component force leftward, so that the holding unit 320 has a tendency to rotate in the p direction, but due to the restriction of the position-limiting portion 301, the movable unit 310 cannot slide in the x direction any more, and the holding unit 320 cannot rotate in the p direction any more, so that the holding unit 320 is maintained at the position, and the photosensitive drum 331 and the developing roller 332 are maintained in the separated state.
As shown in fig. 7c and 7d, in the state after the process cartridge 33 is mounted in the image forming apparatus 10, the photosensitive drum 331 is in contact with the developing roller 332, the force receiving member 321 is located near the rear end of the process cartridge 33, and at the first projection 322, the elastic member 330 generates a restoring force F2 inclined forward, the force F2 forms a component force upward and rightward, the component force upward is greater than the component force rightward, but due to the restriction of the stopper 301, the movable unit 310 cannot slide in the y direction any more, the holding unit 320 cannot rotate in the w direction any more, and the holding unit 320 is held at this position, and the photosensitive drum 331 is in contact with the developing roller 332.
In order to release the above-described separated and contacted state in the process of mounting or dismounting the process cartridge 33, a driving mechanism 100 is provided inside the image forming apparatus 10. As shown in fig. 7a and 7b, when the process cartridge 33 is mounted, the force receiving member 321 abuts against the driving mechanism 100 and receives a leftward urging force of the driving mechanism 100, the leftward urging force is combined with a leftward component force of F1 during the process of continuing mounting of the process cartridge 33, when the combining force is greater than an upward component force of F1, the force balance of the elastic member 330 is broken, the driving mechanism 100 urges the force receiving member 321 toward the rear end of the process cartridge 33, the holding unit 320 rotates in the w direction, and at the same time, the movable unit 310 is slid in the y direction, and the developing roller 332 is also slid in the y direction, so that the developing roller 332 contacts the photosensitive drum 331 and is maintained in a contact state by the elastic member 330. The operation principle of the position switching mechanism 30 has been described in the foregoing, and is not described in detail herein.
As shown in fig. 7c and 7d, when the process cartridge 33 is removed, the force receiving member 321 abuts against the driving mechanism 100 and receives a rightward pushing force of the driving mechanism 100, the rightward pushing force is combined with the rightward component of F2 during the process of continuing to remove the process cartridge 33, when the combining force is greater than the upward component of F2, the force balance of the elastic member 330 is broken, the driving mechanism 100 pushes the force receiving member 321 to move toward the front end of the process cartridge 33, the holding unit 320 rotates in the p direction, and at the same time, the movable unit 310 is slid in the x direction, and the developing roller 332 is also slid in the x direction, so that the developing roller 332 is separated from the photosensitive drum 331, and is kept in a separated state by the elastic member 330.
In the second embodiment of the position switching mechanism 40 of the present invention, the elastic member 330 may be adopted to keep the photosensitive drum 331 and the developing roller 332 in a contact or separated state, however, as shown in fig. 6, the present invention provides another embodiment, in which a fitting structure of the protrusions 403 and the grooves 423 is provided on the supporting portion 400 and the holding unit 420, for example, two protrusions 403 are provided on the supporting portion 400, the two protrusions 403 respectively correspond to the sliding limit positions of the movable unit 410 and the developing roller 332, that is, the contact and separated positions of the photosensitive drum 331 and the developing roller 332, and one groove 423 is provided inside the rod portion 422 of the holding unit 420. When the holding unit 420 swings in the p and w directions, the grooves 423 are engaged with the protrusions 403 at two different positions, respectively, thereby positioning the holding unit 420.
Further, in order to ensure that the driving mechanism 100 can always abut against the force receiving member 321 regardless of whether the process cartridge 33 is being mounted or dismounted, the driving mechanism 100 may be provided with an elastic structure, as shown in fig. 7a, the driving mechanism 100 includes a spring 102 having one end fixedly mounted on the frame of the image forming apparatus 10, and the other end of the spring 102 is provided with a spring block 101, and the tip of the spring block 101 is preferably provided with a taper shape to ensure a smoother fit with the force receiving member 321. The driving mechanism 100 operates on the principle that when the process cartridge 33 is mounted or dismounted in the image forming apparatus 10, the spring block 101 pushes the force receiving member 321 to move, the holding unit 320 is rotated by the force receiving member 321, when the rotation of the holding unit 320 reaches the limit position and cannot rotate any more, the process cartridge 33 continues to advance or retreat because the process cartridge 33 is not mounted in place, at this time, the force receiving member 321 applies pressure to the spring block 101, when the pressure is greater than the elastic force of the spring 102, the spring block 101 is pressed down, the force receiving member 321 goes over the spring block 101 until the process cartridge 33 is mounted in place, and thus, when the process cartridge 33 needs to be dismounted from the image forming apparatus 10, the spring block 101 can be kept before the traveling path of the force receiving member 321. In the present embodiment, the force receiving member 321 is provided as a fixed structure and the driving mechanism 100 is provided as an elastic structure, but it is also possible to provide the driving mechanism 100 as a fixed structure and the force receiving member 321 as an elastic structure.
The process cartridge 33 in the present invention may be of an integrated structure, i.e., the developing assembly and the drum assembly cannot be freely detached; or a split structure, namely the developing component and the drum component can be freely detached. In addition, the photosensitive unit can be in a circular tube structure or a belt structure.
Although only the separation and contact structure of the developing roller and the photosensitive unit is described in the present invention, those skilled in the art can also conceive of applying the position switching mechanism to the cooperation of the charging roller and the photosensitive unit and the cooperation of the cleaning roller and the photosensitive unit.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A process cartridge detachably mountable to an image forming apparatus, comprising:
a light sensing unit;
a rotary body contactable with or separable from the photosensitive unit;
a support portion for rotatably supporting and mounting the rotating body;
a position switching mechanism mounted on the supporting part for driving the photosensitive unit to contact or separate from the rotating body;
wherein the position switching mechanism includes:
a holding unit rotatably mounted on the support portion, the holding unit being provided with a first urging member, a second urging member, and a force receiving member;
a movable unit slidably mounted on the support portion, the movable unit being provided with a first force receiving member engaged with the first force application member and a second force receiving member engaged with the second force application member, one end of the rotating body being connected to the movable unit;
when the process cartridge is mounted in the image forming apparatus, the force receiving member receives an external force from the image forming apparatus, the holding unit rotates to drive the first force applying member to contact and apply a force to the first force receiving member, and the movable unit slides in a first direction by the external force so that the rotating body contacts the photosensitive unit;
when the processing box moves out of the image forming device, the force receiving component is acted by external force from the image forming device, the holding unit rotates reversely, the second force application component is driven to contact and apply force to the second force bearing component, the movable unit slides along a second direction opposite to the first direction under the action of the external force, and therefore the rotating body is separated from the photosensitive unit.
2. A process cartridge according to claim 1, further comprising an elastic member, wherein said holding unit is provided with a first projection, said supporting portion is provided with a second projection, both ends of said elastic member are respectively connected to said first projection and said second projection, and said elastic member enables said holding unit to be held at a first position and a second position; in the first position, the rotating body is separated from the photosensitive unit, and in the second position, the rotating body is in contact with the photosensitive unit.
3. A process cartridge according to claim 1, wherein the first force application member, the second force application member, the first force receiving member and the second force receiving member are arcuate in cross section, and wherein centers of the first force application member and the second force application member and the centers of the first force receiving member and the second force receiving member are offset from each other.
4. A process cartridge according to claim 1, wherein a stopper portion is provided on said supporting portion, and an axial end of said rotary body is supported and mounted on said stopper portion and is movable in said stopper portion.
5. A process cartridge according to claim 4, wherein said supporting portion is provided with a recess in which said stopper portion is disposed, said recess being capable of accommodating said holding unit and said movable unit and being rotatably movable in said recess, said holding unit bringing said movable unit to slide in said recess in either the first direction or the second direction, thereby bringing said rotary body into contact with or away from said photosensitive unit.
6. A process cartridge according to claim 1, wherein said holding unit is hingedly mounted on said supporting portion and is swingable in two opposite directions on said supporting portion, so that said holding unit slides said movable unit in either the first direction or the second direction to bring said rotary body into contact with or separate from said photosensitive unit.
7. A process cartridge according to claim 6, wherein said holding unit is provided with a recess, and said supporting portion is provided with a projection, and said recess is fittable with said projection to enable said holding unit to be held at the first position and the second position; in the first position, the rotating body is separated from the photosensitive unit, and in the second position, the rotating body is in contact with the photosensitive unit.
8. A process cartridge according to any one of claims 1-7, wherein said rotary is a developing roller, and an axial end of said developing roller is connected to said movable unit, and said developing roller is movable between a position of contact with or separation from said photosensitive unit by being carried by said movable unit.
9. An image forming apparatus in which a process cartridge including a rotating body and a photosensitive unit that are contactable with or separable from each other is detachably mounted, and includes a support portion and a position switching mechanism mounted on the support portion;
wherein the position switching mechanism includes:
a holding unit rotatably mounted on the support portion, the holding unit being provided with a first urging member, a second urging member, and a force receiving member;
a movable unit slidably mounted on the support portion, the movable unit being provided with a first force receiving member engaged with the first force application member and a second force receiving member engaged with the second force application member, one end of the rotating body being connected to the movable unit;
the image forming apparatus includes:
a frame body; and
the driving mechanism is arranged on the frame body and used for driving the holding unit to rotate;
the driving mechanism applies an urging force to the force receiving member during mounting of the process cartridge to the image forming apparatus, the holding unit rotates, the first urging member is urged into contact with and applies a force to the first force receiving member, the movable unit slides in a first direction by the urging force, and the rotating body is thereby brought into contact with the photosensitive unit;
in a process of detaching the process cartridge from the image forming apparatus, the driving mechanism applies a reverse acting force to the force receiving member, the holding unit rotates in reverse, the second force application member is urged to contact and apply a force to the second force receiving member, the movable unit slides in a second direction opposite to the first direction by the external force, and the rotating body is separated from the photosensitive unit.
10. The image forming apparatus according to claim 9, wherein the driving mechanism includes a spring having one end fixedly mounted on the frame body and the other end mounted with a resilient block, the resilient block being in contact with the force receiving member during mounting or dismounting of the process cartridge to or from the image forming apparatus, thereby urging the force receiving member to move.
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| CN201710056851.1A CN106886142B (en) | 2017-01-25 | 2017-01-25 | Process cartridge and image forming apparatus |
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| CN201710056851.1A CN106886142B (en) | 2017-01-25 | 2017-01-25 | Process cartridge and image forming apparatus |
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| CN106886142A CN106886142A (en) | 2017-06-23 |
| CN106886142B true CN106886142B (en) | 2020-07-03 |
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| CN106886142A (en) | 2017-06-23 |
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