CN215576123U - Photosensitive unit and process cartridge - Google Patents

Abstract

The utility model discloses a photosensitive unit and a process cartridge. The photosensitive unit comprises a photosensitive frame, a photosensitive drum, a charging roller, a movable support and a separating component, wherein the movable support is movably arranged at two opposite ends of the photosensitive frame, and a rotating shaft of the charging roller is rotatably supported on the movable support; a separating member is removably provided at both opposite ends of the photosensitive frame, the separating member having one or more spacing projections interposed between the movable holder and the photosensitive drum for forming a spacing between the charging roller and the photosensitive drum. In the utility model, the separation member is inserted between the photosensitive drum and the movable support, and the separation of the charging roller and the photosensitive drum can be stably and reliably realized.

Description

Photosensitive unit and process cartridge

Technical Field

The present invention relates to a photosensitive unit and a process cartridge including the photosensitive unit.

Background

Electrophotographic image forming apparatuses such as laser printers and copiers generally have a process cartridge detachably mounted thereon. The process cartridge may be composed of a developing unit and a photosensitive unit, and in a typical structure, the photosensitive unit includes a photosensitive drum rotatably supported on a photosensitive frame and a charging roller that is brought into contact with the photosensitive drum to uniformly charge the surface of the photosensitive drum at the time of image formation; the developing unit includes a developing roller rotatably supported on a developing frame, the developing roller for supplying a developer to the photosensitive drum to develop the electrostatic latent image on the photosensitive drum.

Before the process cartridge is installed and used, if the charging roller is in long-term contact with the photosensitive drum, on one hand, the abrasion of the surface coating of the photosensitive drum is easily caused, and on the other hand, the elastic layer of the charging roller is easily deformed due to the long-term contact with the photosensitive drum, so that the charging defect is generated. Therefore, although the charging roller effects charging of the photosensitive drum by contacting the photosensitive drum, it is preferable to keep the charging roller and the photosensitive drum in a spaced state before the process cartridge is mounted for use.

In the related art, it is common to insert a separation member directly between the charging roller and the photosensitive drum to form a space therebetween. However, in this structure, since the separating member directly presses against the charging roller which is rotatably and movably mounted on the photosensitive frame, the separating member is easily deviated from between the photosensitive drum and the charging roller, causing the photosensitive drum and the charging roller to come into contact before the process cartridge is mounted for use.

Disclosure of Invention

The main object of the present invention is to provide a photosensitive unit capable of stably and reliably achieving separation of a charging roller from a photosensitive drum.

Another object of the present invention is to provide a process cartridge including the above photosensitive unit.

In order to achieve the above-described primary object, one aspect of the present invention provides a photosensitive unit including a photosensitive frame, a photosensitive drum, and a charging roller; further comprising:

the movable supports are movably arranged at two opposite ends of the photosensitive frame; the rotating shaft of the charging roller is rotatably supported on the movable bracket;

separation members removably provided at both opposite ends of the photosensitive frame; the separating member has one or more spacing projections interposed between the movable holder and the photosensitive drum for spacing the charging roller and the photosensitive drum.

Among the above-mentioned technical scheme, the roller that charges is supported by movable support, has simple structure's advantage. Since the spacing projection of the separating member is inserted between the movable holder and the photosensitive drum so that the spacing projection is directly pressed against the movable holder instead of the charging roller, the position of the spacing projection is not affected by the rotational movement of the charging roller, and the separation of the charging roller and the photosensitive drum can be stably and reliably achieved.

According to an embodiment of the present invention, a locking structure for positioning the separating member in a longitudinal direction of the photosensitive drum is formed between the separating member and the photosensitive frame. Thus, the separation member can be prevented from being unintentionally separated from the photosensitive frame.

Further, the separating component further comprises an elastic deformation part, and the locking structure comprises a clamping protrusion arranged on the elastic deformation part. Set up the joint arch on elastic deformation portion, both can realize the reliable connection between separating element and the photosensitive frame, also be convenient for remove separating element from photosensitive frame.

Further, the separating member further includes a handle portion connected to the elastically deformable portion, the handle portion being used to remove the separating member from the photosensitive frame. When the processing box is installed, the elastic deformation part generates elastic deformation along with the stress of the handle part so as to relieve the clamping connection between the clamping protrusion and the photosensitive frame.

According to an embodiment of the present invention, the photosensitive frame has first and second end caps at opposite ends thereof, respectively, the first and second end caps having mounting grooves exposing the movable bracket, the separation member being removably disposed in the mounting grooves. The movable bracket is exposed in the mounting groove, so that the spacing projection can be accurately inserted between the movable bracket and the photosensitive drum.

According to an embodiment of the present invention, the separating member has two spacing projections provided on opposite sides of the rotational axis of the charging roller, respectively, so that the movable holder can be more smoothly pressed, and the charging roller can be more stably spaced from the photosensitive drum. Wherein the two spacing protrusions may have a symmetrical distribution with respect to the rotational axis of the charging roller.

According to an embodiment of the present invention, the side of the spacer projection facing the movable bracket is provided with an abutting portion that abuts against the movable bracket, and the abutting portion is preferably arranged in parallel with respect to the insertion direction of the separation member so that the direction of the abutting force between the abutting portion and the movable bracket is perpendicular to the rotation axis of the charging roller, and the spacer projection can more stably abut against the movable bracket.

According to an embodiment of the present invention, a front end of the spacer projection on a side facing the movable holder has an insertion guide portion provided obliquely with respect to an insertion direction of the separation member so that the spacer projection is smoothly inserted between the movable holder and the photosensitive drum.

According to an embodiment of the present invention, an elastic member for applying an elastic force toward the photosensitive drum to the movable bracket is provided between the photosensitive frame and the movable bracket, so that the movable bracket is moved toward the photosensitive drum until the charging roller contacts the photosensitive drum after the separation member is removed.

Another aspect of the present invention provides a process cartridge including a developing unit and any one of the photosensitive units described above. Through adopting above sensitization unit, can be before handling cartridge installation and use with the roller of charging and sensitization drum steady spacing, have better formation of image quality when guaranteeing to handle the cartridge and use.

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

Drawings

FIG. 1 is a perspective view of an embodiment of a process cartridge according to the present invention;

FIG. 2 is an exploded view of an embodiment of the process cartridge of the present invention;

FIG. 3 is an exploded view of a first embodiment of a light sensing unit according to the present invention;

FIG. 4 is a second exploded view of the embodiment of the light sensing unit of the present invention;

FIG. 5 is an enlarged partial view of the portion of the movable support of FIG. 4;

FIG. 6 is a structural view of a separating member interposed between a photosensitive drum and a movable holder;

FIG. 7 is an enlarged partial view of the separating member portion of FIG. 6;

fig. 8 is a perspective view of an embodiment of the separating member of the present invention.

Detailed Description

Structure of embodiment of processing box

Referring to fig. 1 and 2, the process cartridge of the embodiment includes a photosensitive unit 10 and a developing unit 20. Among them, the photosensitive unit 10 has a photosensitive frame 11 and a photosensitive drum 12 rotatably supported on the photosensitive frame 11, and the developing unit 20 has a developing frame 21 and a developing roller (not visible in the drawing) rotatably supported on the developing frame 21. The photosensitive frame 11 includes a first end cap 112 and a second end cap 113 provided at both opposite ends thereof, and the developing frame 21 is provided between the first end cap 112 and the second end cap 113. The developing frame 21 may be fixedly connected to the first end cap 112 and the second end cap 113, or may be movably connected (e.g., rotatably connected).

Structure of embodiment of photosensitive unit

As shown in fig. 3 and 4, in a specific embodiment, the photosensitive frame 11 includes a main body portion 111, a first end cap 112, a second end cap 113, and a side wall 114. The main body 111, the second end cap 113 and the sidewall 114 may be integrally formed, and the first end cap 112 may be fixedly connected to the sidewall 114 by screws. The photosensitive drum 12 is rotatably supported at both opposite ends of the photosensitive frame 11, for example, on the second end cap 113 and the side wall 114.

Both opposite end portions of the photosensitive frame 11 are provided with movable brackets 14, respectively, and the rotating shaft 131 of the charging roller 13 is rotatably supported on the movable brackets 14 (see fig. 5). The movable holder 14 is movable in a direction to approach and separate from the photosensitive drum 12, and the interval between the charging roller 13 and the photosensitive drum 12 changes with the movement of the movable holder 14. As shown in fig. 5, the movable holder 14 may have a substantially U-shaped groove with a constricted opening, and the rotating shaft 131 of the charging roller 13 may be pressed into the U-shaped groove of the movable holder 14 through the opening, which has advantages of simple structure and easy assembly.

Further, as shown in fig. 3 to 4, 6 to 7, the photosensitive frame 11 is removably provided at both opposite ends thereof with the separating member 15, the separating member 15 having one or more spacing projections 151 interposed between the movable holder 14 and the photosensitive drum 12, the spacing projections 151 being used to form a spacing between the charging roller 13 and the photosensitive drum 12. In this structure, the spacing projection 151 directly abuts against the movable holder 14 instead of the charging roller 13, and therefore the position of the spacing projection 151 is not affected by the rotational movement of the charging roller 13, so that the separation of the charging roller 13 and the photosensitive drum 12 can be stably and reliably achieved.

In one embodiment, the first end cap 112 has a mounting groove 1121, the second end cap 113 has a mounting groove 1131, the movable brackets 14 at two opposite ends of the photosensitive frame 11 are respectively exposed in the mounting grooves 1121 and 1131, and a separating member 15 is respectively disposed in the mounting groove 1121 and the mounting groove 1131. Since the movable holder 14 is exposed in the mounting grooves 1121 and 1131, respectively, the spacing projections 151 of the separating member 15 can be inserted between the movable holder 14 and the photosensitive drum 12 easily and accurately.

Further, as shown in fig. 3 to 5, an elastic member 16 such as a spring is provided between the photosensitive frame 11 and the movable holder 14, and the elastic member 16 is used to apply an elastic force toward the photosensitive drum 12 to the movable holder 14. After the separation member 15 is removed, the movable holder 14 is moved toward the photosensitive drum 12 until the charging roller 13 contacts the photosensitive drum 12.

In one embodiment, as shown in fig. 7 and 8, the separating member 15 has two spacing projections 151, and the two spacing projections 151 are respectively provided on opposite sides of the rotational axis of the charging roller 13, so that it is possible to more smoothly press the movable holder 14, and thus to more stably space the charging roller 13 from the photosensitive drum 12. The two spacing projections 151 may be disposed symmetrically or asymmetrically with respect to the rotational axis of the charging roller 13, preferably symmetrically with respect to the rotational axis of the charging roller 13.

The side of the spacing projection 151 facing the photosensitive drum 12 has an abutting portion 1513 abutting against the photosensitive drum 12, the abutting portion 1513 being formed as a plane provided in parallel with the insertion direction of the separation member 15; the front end of the spacer boss 151 on the side facing the movable holder 14 has an insertion guide portion 1511, and the insertion guide portion 1511 forms a slope provided obliquely with respect to the insertion direction of the separation member 15 so as to facilitate insertion of the spacer boss 151 between the movable holder 14 and the photosensitive drum 12. A planar abutting part 1512 is further arranged on one side of the spacing projection 151 facing the movable bracket 14, and after the separating member 15 is installed in place, the abutting part 1512 keeps abutting against the movable bracket 14; preferably, the abutting portion 1512 is provided in parallel with the insertion direction of the separation member 15. Wherein the insertion direction of the separation member 15 is parallel to the rotation axis of the photosensitive drum 12 and the charging roller 13.

Further, a locking structure for positioning the separating member 15 in the longitudinal direction of the photosensitive drum 12 to prevent the separating member from being unintentionally disengaged from the photosensitive frame 11 may be formed between the separating member 15 and the photosensitive frame 11. In one embodiment, the separating member 15 includes an elastic deformation portion 152, and the locking structure includes a snap protrusion 1521 provided on the elastic deformation portion 152. The clamping protrusion 1521 and the photosensitive frame 11 form detachable clamping connection; taking the separating member 15 disposed in the mounting groove 1311 as an example, as shown in fig. 4, a clamping groove 1312 is disposed on a side wall of the mounting groove 1311, and the clamping protrusion 1521 and the clamping groove 1312 cooperate to form a snap connection.

Further, the separating member 15 further includes a handle portion 153 connected to the elastic deformation portion 152, the handle portion 153 being used to remove the separating member 15 from the photosensitive frame 11. Specifically, when the process cartridge is mounted and used, in order to remove the separating member 15, an acting force may be applied to the handle portion 153 to deform the elastic deformation portion 152 to separate the latching protrusion 1521 from the photosensitive frame 11, and the separating member 15 can be removed from the photosensitive frame 11 as the latching connection between the latching protrusion 1521 and the photosensitive frame 11 is released. At this time, the movable holder 14 is moved toward the photosensitive drum 12 by the elastic member 16 until the charging roller 13 contacts the photosensitive drum 12.

Although the present invention has been described with reference to specific embodiments, it is not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that various changes and modifications can be made without departing from the scope of the utility model, and it is intended to cover all modifications and equivalents of the utility model as defined by the appended claims.

Claims (10)

1. A photosensitive unit includes a photosensitive frame, a photosensitive drum, and a charging roller; the method is characterized in that:

the movable supports are movably arranged at two opposite ends of the photosensitive frame; the rotating shaft of the charging roller is rotatably supported on the movable bracket;

separation members removably provided at both opposite ends of the photosensitive frame; the separation member has one or more spacing projections interposed between the movable holder and the photosensitive drum for forming a spacing between the charging roller and the photosensitive drum.

2. The photosensitive unit according to claim 1, wherein: a locking structure is formed between the separation member and the photosensitive frame, and the locking structure is used for positioning the separation member in the length direction of the photosensitive drum.

3. The photosensitive unit according to claim 2, wherein: the separating component further comprises an elastic deformation part, and the locking structure comprises a clamping protrusion arranged on the elastic deformation part.

4. The photosensitive unit according to claim 3, wherein: the separating member further includes a handle portion connected to the elastic deformation portion, the handle portion being used to remove the separating member from the photosensitive frame.

5. The photosensitive unit according to claim 1, wherein: the two opposite ends of the photosensitive frame are respectively provided with a first end cover and a second end cover, the first end cover and the second end cover are provided with mounting grooves for exposing the movable support, and the separation member is removably arranged in the mounting grooves.

6. The photosensitive unit according to claim 1, wherein: the separation member has two of the spacing projections provided on opposite sides of the rotation axis of the charging roller, respectively.

7. The photosensitive unit according to claim 1, wherein: one side of the spacing bulge facing the movable bracket is provided with an abutting part abutted against the movable bracket; the abutting portion is disposed in parallel with respect to an insertion direction of the separation member.

8. The photosensitive unit according to claim 1, wherein: the front end of the spacer projection on the side facing the movable holder has an insertion guide portion which is disposed obliquely with respect to the insertion direction of the separating member.

9. The photosensitive unit according to claim 1, wherein: an elastic element is arranged between the photosensitive frame and the movable support, and the elastic element is used for applying elastic force towards the photosensitive drum to the movable support, so that after the separation member is removed, the movable support moves towards the photosensitive drum direction until the charging roller contacts the photosensitive drum.

10. A process cartridge characterized by comprising a developing unit and the photosensitive unit according to any one of claims 1 to 9.

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