KR20120050859A - Photosensitive drum assembly and cartridge including it - Google Patents

Photosensitive drum assembly and cartridge including it Download PDF

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Publication number
KR20120050859A
KR20120050859A KR1020100112319A KR20100112319A KR20120050859A KR 20120050859 A KR20120050859 A KR 20120050859A KR 1020100112319 A KR1020100112319 A KR 1020100112319A KR 20100112319 A KR20100112319 A KR 20100112319A KR 20120050859 A KR20120050859 A KR 20120050859A
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KR
South Korea
Prior art keywords
photosensitive drum
power transmission
rotation
drum assembly
transmission unit
Prior art date
Application number
KR1020100112319A
Other languages
Korean (ko)
Inventor
조남혁
Original Assignee
(주) 네오포토콘
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Filing date
Publication date
Application filed by (주) 네오포토콘 filed Critical (주) 네오포토콘
Priority to KR1020100112319A priority Critical patent/KR20120050859A/en
Publication of KR20120050859A publication Critical patent/KR20120050859A/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/75—Details relating to xerographic drum, band or plate, e.g. replacing, testing
    • G03G15/751—Details relating to xerographic drum, band or plate, e.g. replacing, testing relating to drum

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

PURPOSE: A photosensitive drum assembly and cartridge of an image creation apparatus including the same are provided to reduce the motion of a photosensitive drum by stably transmitting a driving force to the photosensitive drum. CONSTITUTION: A power supply unit is rotatably combined with a cartridge housing unit(110). A photosensitive drum(1) receives the rotation power of the power supply unit. The photosensitive drum is slid from the rotation shaft of the power supply unit. When the power supply unit receives the rotation power, a thrust is generated from the rotation shaft. The movement of the power supply unit is restricted in the rotation shaft direction of the power supply unit. The power supply unit is rotatably installed in the cartridge housing unit.

Description

Photosensitive drum assembly and cartridge of an image forming apparatus including the same

The present invention relates to a photosensitive drum assembly for use in an electrophotographic image forming apparatus and a cartridge comprising the same.

An image forming apparatus is a device for forming characters or images on paper or the like, and includes a copying machine and a laser printer.

Laser printers, for example, are non-impact printers that print using the principle of electrostatic phenomena, which form image information on a photosensitive drum through a laser, temporarily adhere to an image on which toner is formed, and then compress the film at a high temperature. . At this time, it is common to refer to the electrostatic phenomenon to fix the toner to the photosensitive drum.

Such an image forming apparatus is provided with a cartridge detachably provided with a toner container, a photosensitive drum assembly, a charging unit, a cleaning unit, an exposure unit, a developing unit, and the like for resupply of the toner and periodic replacement of the consumable member.

As the cartridge is detachable from the image forming apparatus, the position of the photosensitive drum and the like provided in the cartridge may vary depending on the combination. On the other hand, the alignment of the photosensitive drum is essential to obtain precise print quality.

In addition, since the photosensitive drum and the developing unit provided in the cartridge must be rotated properly to perform a printing operation, the photosensitive drum assembly provided in the cartridge is rotated only when a driving force is transmitted from the main body of the image forming apparatus.

In order to align the photosensitive drum and transmit the driving force, the photosensitive drum assembly is provided with members for aligning the photosensitive drum while receiving rotational force.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object of stably transmitting the driving force provided from the image forming apparatus main body to the photosensitive drum assembly.

In accordance with an aspect of the present invention, there is provided a power transmission unit rotatably coupled to a cartridge housing, and a photosensitive drum which is rotated in response to a rotation of the power transmission unit, wherein the photosensitive drum is a rotating shaft of the power transmission unit. It is slidable in a direction parallel to the, while the photosensitive drum receives the rotational force of the power transmission portion, the photosensitive drum is formed with a thrust to slide in a direction parallel to the axis of rotation, the power transmission portion is the rotation axis direction of the power transmission portion Movement is limited to, and proposes a photosensitive drum assembly rotatably installed in the cartridge housing.

The thrust may be generated by a first helical gear provided on an outer circumferential surface of the photosensitive drum and a second helical gear rotated on an axis parallel to the axis of rotation of the photosensitive drum. In addition, the thrust may act in a direction away from the photosensitive drum power transmission unit.

In addition, the power transmission portion is formed with a projection protruding inside the cartridge housing, the photosensitive drum is a power having a receiving portion which is freely movable with respect to the projection direction of the projection while restraining the projection in the circumferential direction A receiving unit may be provided.

In another embodiment, the cartridge housing is provided with a power receiving shaft portion that is rotated in an axis parallel to the axis of rotation of the power transmission portion, the rotation of the power transmission portion is transmitted to the photosensitive drum via the power receiving shaft portion, the thrust is the It may be generated by the bite of the helical gears that are provided on the power receiving shaft portion and each outer peripheral surface of the photosensitive drum to mesh with each other.

In this case, the power transmission unit may further include a shaft fixing means for matching the rotation axis of the photosensitive drum.

At this time, the shaft fixing means is a bracket having one end fixed to the cartridge housing, the front shaft portion is provided on the front of the bracket rotatably coupled, and the same axis of rotation as the front shaft portion on the rear of the bracket It is provided, and may include a rear axis portion rotatably coupled to the photosensitive drum.

On the other hand, the above-mentioned photosensitive drum assembly, a developing unit which supplies toner to an electrostatic latent image formed on the photosensitive drum of the photosensitive drum assembly to form a toner image, a charging unit for charging the photosensitive drum to a potential, and a toner in the photosensitive drum It provides a cartridge of the image forming apparatus comprising a cleaning unit to scrape off.

In another embodiment, the above-described photosensitive drum assembly includes a developing unit configured to supply a toner image to an electrostatic latent image formed on the photosensitive drum of the photosensitive drum assembly and to form a toner image, and provided on an outer circumferential surface of the photosensitive drum. The second helical gear meshing with the helical gear presents a cartridge of the image forming apparatus coupled to the developing unit.

Furthermore, the above-described power receiving shaft portion may be the developing unit.

According to the embodiment of the present invention, the driving force provided from the image forming apparatus main body is stably transmitted to the photosensitive drum assembly provided in the cartridge, thereby improving print quality. In addition, since the photosensitive drum is aligned with the rotation, the shaking of the photosensitive drum is reduced during the printing process, thereby further improving the printing quality.

1 is a schematic cross-sectional view of a cartridge according to an embodiment of the present invention.
2 is a cross-sectional view of the photosensitive drum assembly according to the first embodiment of the present invention.
3 is an exploded cross-sectional view of the main portion of FIG.
4 is a schematic perspective view of a power transmission unit and a power receiving unit employed in the photosensitive drum assembly shown in FIG. 2;
5 is a cross-sectional view of a photosensitive drum assembly according to a second embodiment of the present invention.
6 is a cross-sectional view of a photosensitive drum assembly according to a third embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described the configuration, function and operation of the cartridge of the photosensitive drum assembly and the image forming apparatus according to an embodiment of the present invention. However, the reference numerals for components having the same or similar functions are used in unison.

1 shows a cartridge according to an embodiment of the invention.

The cartridge 100 of the image forming apparatus is detachable to a main body (not shown) of the image forming apparatus. The cartridge 100 includes a photosensitive drum assembly 10 and a developing unit 20. In addition, the cartridge 100 may further include a charging unit 30, a cleaning unit 40, toner storage, and the like.

The photosensitive drum assembly 10, the developing unit 20, and the charging unit 30 are each configured to be adjacent to each other by substantially cylindrical roller members, and may be rotatably configured on axes parallel to each other. Rotation of such roller members can be achieved through known power transmission means such as gears or belts coupled to each roller member.

The photosensitive drum assembly 10 includes a photosensitive drum having a hollow cylindrical shape. The photosensitive drum has its outer peripheral surface charged by a charging unit, and an electrostatic latent image corresponding to the image to be printed is formed by light irradiated from the exposure unit.

The developing unit 20 supplies the toner to the electrostatic latent image formed on the photosensitive drum, and a developing bias voltage is applied to supply the toner to the photosensitive drum.

The transfer unit causes the toner image developed on the photosensitive drum to be transferred onto the recording medium. For this purpose, a transfer bias voltage is applied to the transfer unit. The toner image transferred to the recording medium is fixed to the recording medium by high temperature compression by rollers.

The cleaning unit 40 removes the toner remaining in the photosensitive drum after printing is finished.

2 shows a photosensitive drum assembly according to a first embodiment of the present invention.

The photosensitive drum assembly 10 according to the first embodiment of the present invention includes the photosensitive drum 1 and the power transmission unit 2 described above.

The power transmission unit 2 is rotatably coupled to the cartridge housing 110, and receives the driving force provided from the main body and transmits the driving force to the photosensitive drum 1.

At this time, the rotation of the photosensitive drum 1 may be made by the rotation of the power transmission unit 2 is directly transmitted. That is, the rotational force of the power transmission unit 2 is directly transmitted to the rotational force of the photosensitive drum (1). For this purpose, the power transmission unit (2) and the photosensitive drum (1). Without a separate member such as a gear, a belt for transmitting the rotational force in the middle, it is coupled to transmit the rotational force to each other.

In addition, since the power transmission unit 2 and the photosensitive drum 1 are not integrally bound, the photosensitive drum 1 is slidably provided in a direction parallel to the axis of rotation of the power transmission unit 2.

In this case, the space in which the photosensitive drum is slidable may be due to the clearance of the shaft fixing of the photosensitive drum mounted in the cartridge housing. Precise printing through the photosensitive drum requires that the photosensitive drum is aligned at a certain position and stably rotated.

The photosensitive drum 1 receives the rotational force of the power transmission unit 2 in order to align the position of the photosensitive drum, and the photosensitive drum 1 is provided with a photosensitive drum in a direction parallel to the axis of rotation of the power transmission unit 2. Thrust to move 1) is formed. That is, when the photosensitive drum 1 starts to rotate while being synchronized with the power transmission unit 2, the photosensitive drum 1 is slid to one side of the cartridge 100, thereby bringing the photosensitive drum 1 into close contact with the inner wall of the cartridge housing 110. It is to align the drum (1).

This thrust may be generated by the first helical gear H1 provided on the outer circumferential surface of the photosensitive drum 1 and the second helical gear H2 rotated on an axis parallel to the axis of rotation of the photosensitive drum 1. .

That is, when the photosensitive drum 1 is rotated by the rotation of the power transmission unit 2, the second helical gear H2 rotates by engaging the first helical gear H1 formed on the outer circumferential surface of the photosensitive drum 1. At this time, both ends of the rotating shaft of the second helical gear H2 are fixed to the cartridge housing. Here, the rotation axis of the second helical gear H2 may be a developing unit 20. Alternatively, the rotation axis of the second helical gear may be another cylindrical member.

The thrust generated by engaging rotation of the first helical gear H1 and the second helical gear H2 moves the photosensitive drum 1 in a direction away from the power transmission part 2, or the power transmission part 2. The photosensitive drum 1 is aligned by moving in a direction approaching to. At this time, the action direction of the thrust can be changed by adjusting the thread inclination direction of the first and second helical gears, the inclination direction of the thread can be selected at the time of design of the cartridge.

At this time, the thrust may allow the photosensitive drum to act in a direction away from the power transmission unit. Specifically, as shown in FIG. 2, the power transmission unit 2 and the photosensitive drum 1 may be installed to lie on the same axis of rotation, in which case the photosensitive drum 1 may be attached to the power transmission unit 2. It may be desirable for a stable rotation that the assembly error is moved and aligned toward the opposite stationary portion 11 rather than being aligned.

With reference to Figures 2 to 4 will be described a configuration for transmitting the rotational force of the main body.

The power transmission part 2 is provided with a protrusion 21 protruding into the cartridge housing 110, and the photosensitive drum 1 protrudes from the protrusion 21 while constraining the protrusion 21 in the circumferential direction. The power accommodating part 3 is provided with the accommodating part 31 which can be moved freely with respect to the direction.

Specifically, the power transmission unit 2 is formed on the rotating body portion 22 is formed with a flange, one surface of the rotating body portion 22 protrudes out of the cartridge housing 110 and the rotating body 200 of the image forming apparatus main body Coupled to the coupling portion 23, and the projections 21 are included.

Rotating body portion 22 may be cylindrical. The flange 221 formed on the rotating body 22 is fitted to the step 130 of the fitting hole 120 formed in the cartridge housing 110, so that the power transmission unit 2 can rotate in the cartridge housing 110. While not restricting the movement in the direction of the rotation axis.

Coupling portion 23 has a shape corresponding to the rotating body 200 of the main body, it is to transfer the rotation of the rotating body 200 to the power transmission unit 2 by the combination with the rotating body 200. As shown in detail, when the rotating body 200 of the main body is formed of the groove 210 having a non-circular cross section, the coupling part 23 is formed of a plurality of pillar members 231 inserted into the groove 210. Can be. Alternatively, although not shown, the rotating body may be a pillar member having a non-circular cross section, and the coupling part may be formed as a groove into which the pillar member is inserted.

In addition, when the electrode 220 is further provided in the groove 210 formed in the rotating body of the main body, an electrode surface (not shown) in contact with the power supply may be further formed in the coupling part or the rotating body part.

On the other hand, the projection portion 21 is to be coupled to the power receiving portion 3, the projection portion 21 and the power receiving portion (3) is constrained in the circumferential direction to each other while the rotational force is transmitted to the power receiving portion (3) ) Is movably coupled.

The protrusion 21 includes a shaft pillar 211 protruding from the center of the rotating body 22, and at least one pin 212 protruding from the side of the shaft pillar 211. On the other hand, the power receiving portion 3 has a receiving portion 31 is coupled to the protrusion 21 on one surface, the stepped portion 32 is coupled to the photosensitive drum (1) is formed on the other end. In addition, the first helical gear H1 described above is formed on the outer circumferential surface of the power receiving portion 3. In this case, the accommodating part 31, the stepped part 32, and the first helical gear H1 may be integrally formed.

The accommodating part 31 includes an insertion hole 311 corresponding to the shaft pillar 211 and a pin groove 312 recessed at the periphery of the insertion hole 311 corresponding to the pin 212. At this time. Pin groove 312 is open toward one surface of the power receiving portion (3). Alternatively, when the pin groove is further provided with an electrode copper plate connected to the gear portion, the pin groove may be opened in the axial direction and formed as a hole. That is, the electrode of the rotating body reaches the pin of the power transmission unit, the pin can be configured to contact the copper plate for the electrode exposed in the pin groove.

As a result, the accommodating part 31 and the protrusion part 21 are slidable in the axial direction of the power accommodating part 3, while the pin 212 is in contact with the pin groove 312 when the power transmitting part 2 is rotated and the rotational force is applied. It is transmitted to this power receiving part 3 and the photosensitive drum 1. Here, the pin may be freely rotatably coupled to the shaft pillar so that the power receiving portion and the photosensitive drum may move freely in the axial direction while the pin 212 is rotated in contact with the pin groove 312.

These protrusions and the receiving portion may have another configuration that is constrained with each other in the circumferential direction so that the rotational force is transmitted and free movement in the axial direction.

On the other hand, Figure 5 is a cross-sectional view of the photosensitive drum assembly according to a second embodiment of the present invention.

The photosensitive drum assembly 10 according to the second embodiment of the present invention is rotated by receiving the rotation of the power transmission unit 2 and the power transmission unit 2 rotatably coupled to the cartridge housing 110. It includes a photosensitive drum (1), the photosensitive drum (1) is slidable in a direction parallel to the axis of rotation of the power transmission unit 2, the photosensitive drum (1) is the rotational force of the power transmission unit (2) While receiving the thrust is formed in the photosensitive drum (1) to slide in a direction parallel to the rotation axis. In addition, the photosensitive drum assembly 10 further includes a power receiving shaft portion 4 which transmits the rotational force of the power transmission unit 2 to the photosensitive drum 1 and generates thrust on the photosensitive drum 1.

Specifically, the power transmission unit 2 is coupled to the rotating body 200 of the image forming apparatus is rotated by receiving the driving force of the rotating body. The power transmission part 2 includes a rotating body part 22 and a coupling part 23, and the rotating body part and the coupling part are the same as in the above-described first embodiment, and thus redundant description thereof will be omitted. The first gear G1 may be coupled to one surface of the power transmission unit 2 opposite to the coupling portion, that is, toward the cartridge housing 110. In this case, the first gear may be integrally formed with the rotating body portion.

On the other hand, the power receiving shaft portion 4 is coupled to the free rotation on the axis parallel to the axis of rotation of the power transmission unit 2 in the cartridge housing 110. The power receiving shaft portion 4 is rotated in synchronization with the rotation of the power transmission portion 2, the rotation of the power transmission portion 2 is transmitted to the photosensitive drum 1 via the power receiving shaft portion (4). In addition, the thrust is generated by the bite of the helical gears which are provided on each outer peripheral surface of the power receiving shaft portion 4 and the photosensitive drum 1 to mesh with each other.

The power receiving shaft portion 4 is provided with a second gear G2 meshing with the first gear G1, and the second helical gear H2 described above. At this time, a known belt, chain, etc. rotational motion transmission mechanism for transmitting rotational force by replacing the first and second gears may be used. In addition, the photosensitive drum 1 is coupled to the power receiving portion 3 formed on the outer circumferential surface of the first helical gear H1 meshing with the second helical gear H2. Thrust is generated by the engagement rotation of the first and second helical gears is the same as the first embodiment described above, and thus duplicated description is omitted.

In the photosensitive drum assembly 10 according to the second embodiment, as the rotational force of the power transmission unit 2 is transmitted to the photosensitive drum 1 through the power receiving shaft unit 4, the first and second gear ratios are adjusted. The combination of the first and second helical gear ratios has the advantage of changing the torque and rotational speed of the various photosensitive drums.

At this time, the power receiving shaft portion 4 may be a developing unit. Alternatively, the power receiving shaft portion may be another cylindrical member.

Furthermore, it may further include a shaft fixing means (5) for matching the rotation axis of the power transmission unit 2 and the rotation axis of the photosensitive drum (1). In this case, by rotating the power transmission unit 2 and the photosensitive drum 1 on the same rotation axis, it is possible to increase the space utilization of the cartridge having a limited internal space.

Specifically, the shaft fixing means 5 is a bracket 51 fixed to the cartridge housing 110, the front shaft portion 52 which is provided on the front surface of the bracket 51 rotatably coupled to the power transmission unit (2). And a rear shaft portion 53 having the same rotation axis as the front shaft portion 52 and provided on the rear surface of the bracket 51, to which the photosensitive drum 1 is rotatably coupled. At this time, the rear shaft portion 53 may be coupled through the power receiving portion 3 provided in the photosensitive drum (1).

One side of the bracket 51 is fixed to the cartridge housing 110, and as the front shaft portion 52 and the rear shaft portion 53 are mounted, the front shaft portion 52 and the rear shaft portion 53 are fixed with respect to the cartridge. do. As the power transmission unit 2 and the photosensitive drum 1 are rotatably coupled to the front shaft unit 52 and the rear shaft unit 53, respectively, the power transmission unit 2 and the photosensitive drum 1 rotate stably. You have the conditions to do it.

On the other hand, the first and second helical gears may be located at either end in the longitudinal direction of the photosensitive drum. In FIG. 6, helical gears H1 and H2 are provided at the end of the photosensitive drum 1. The formation position of these helical gears may vary according to a user's selection.

100: cartridge
110: cartridge housing 120: fitting hole 130: step
10: photosensitive drum assembly
1: photosensitive drum
11: high-level government 2: power transmission 21: projection
211: shaft pillar 212: pin 22: rotating body portion 221: flange
23: coupling portion 231: pillar member
3: power receiving unit
31: accommodating part 311: insertion hole 312: pin groove 32: stepped portion
4: power receiving shaft
5: shaft fixing means
51 bracket 52 front shaft portion 53 rear shaft portion
G1, G2: gear H1. H2: Helical Gear
20: developing unit
30: charging unit
40: cleaning unit
200: rotating body
210: groove 220: electrode

Claims (10)

A power transmission unit rotatably coupled to the cartridge housing;
It includes a photosensitive drum that is rotated by receiving the rotation of the power transmission unit,
The photosensitive drum is slidable in a direction parallel to the axis of rotation of the power transmission unit,
While the photosensitive drum receives the rotational force of the power transmission unit, the photosensitive drum is provided with a thrust for sliding movement in a direction parallel to the rotation axis,
The power transmission unit
The photosensitive drum assembly is limited in movement in the direction of the rotation axis of the power transmission unit, rotatably installed in the cartridge housing. In claim 1,
The thrust is
A first helical gear provided on an outer circumferential surface of the photosensitive drum;
A photosensitive drum assembly generated by a second helical gear rotated on an axis parallel to the axis of rotation of the photosensitive drum. In claim 2,
The thrust is a photosensitive drum assembly that acts in a direction away from the photosensitive drum power transmission. In claim 1,
The power transmission portion is formed with a projection protruding into the cartridge housing,
The photosensitive drum assembly has a photosensitive drum assembly having a power receiving portion is formed in the circumferential direction of the photosensitive drum, the receiving portion is formed to be freely moved in the projecting direction of the projection. In claim 1,
The cartridge housing is provided with a power receiving shaft portion that is rotated in an axis parallel to the axis of rotation of the power transmission portion,
Rotation of the power transmission unit is transmitted to the photosensitive drum via the power receiving shaft,
The thrust is provided on the outer circumferential surface of the power receiving shaft portion and the photosensitive drum, the photosensitive drum assembly is generated by the bite of the helical gears engaged with each other. The method of claim 5,
And a shaft fixing means for matching the rotation axis of the power transmission unit and the rotation axis of the photosensitive drum. The method of claim 6,
The shaft fixing means
A bracket fixed to the cartridge housing,
It is provided on the front of the bracket and the front shaft portion rotatably coupled to the power transmission portion, And
A photosensitive drum assembly having the same axis of rotation as the front shaft portion and provided on the rear side of the bracket, and including a rear shaft portion to which the photosensitive drum is rotatably coupled. A photosensitive drum assembly according to claim 1,
A developing unit that supplies toner to an electrostatic latent image formed on the photosensitive drum of the photosensitive drum assembly to form a toner image.
A charging unit for charging the photosensitive drum to a potential; and
And a cleaning unit for scraping off the toner in the photosensitive drum. A photosensitive drum assembly according to claim 2, and
A developing unit for supplying toner to an electrostatic latent image formed on the photosensitive drum of the photosensitive drum assembly to form a toner image,
And a second helical gear engaged with the first helical gear provided on the outer circumferential surface of the photosensitive drum is coupled to the developing unit. A photosensitive drum assembly according to claim 5, and
A developing unit for supplying toner to an electrostatic latent image formed on the photosensitive drum of the photosensitive drum assembly to form a toner image,
And the power receiving shaft portion is the developing unit.
KR1020100112319A 2010-11-11 2010-11-11 Photosensitive drum assembly and cartridge including it KR20120050859A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100112319A KR20120050859A (en) 2010-11-11 2010-11-11 Photosensitive drum assembly and cartridge including it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100112319A KR20120050859A (en) 2010-11-11 2010-11-11 Photosensitive drum assembly and cartridge including it

Publications (1)

Publication Number Publication Date
KR20120050859A true KR20120050859A (en) 2012-05-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100112319A KR20120050859A (en) 2010-11-11 2010-11-11 Photosensitive drum assembly and cartridge including it

Country Status (1)

Country Link
KR (1) KR20120050859A (en)

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