KR20100075266A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
KR20100075266A
KR20100075266A KR1020080133914A KR20080133914A KR20100075266A KR 20100075266 A KR20100075266 A KR 20100075266A KR 1020080133914 A KR1020080133914 A KR 1020080133914A KR 20080133914 A KR20080133914 A KR 20080133914A KR 20100075266 A KR20100075266 A KR 20100075266A
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KR
South Korea
Prior art keywords
coupling
dummy
drive
driven
rotating shaft
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KR1020080133914A
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Korean (ko)
Inventor
김성대
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삼성전자주식회사
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Priority to KR1020080133914A priority Critical patent/KR20100075266A/en
Publication of KR20100075266A publication Critical patent/KR20100075266A/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
    • G03G15/757—Drive mechanisms for photosensitive medium, e.g. gears

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

Abstract

The present invention relates to an image forming apparatus having an improved power transmission structure. The image forming apparatus according to a preferred embodiment includes a rotating body, a rotating shaft coupled to the rotating body, a driven coupling coupled to the rotating shaft, and a driving motor. A dummy having a drive coupling rotated by a driving force generated by the drive force; (dummy) Includes a coupling.

Description

Image Forming Device {IMAGE FORMING APPARATUS}

The present invention relates to an image forming apparatus, and more particularly, to an image forming apparatus having an improved power transmission structure through a coupling.

An image forming apparatus is an apparatus for forming an image on a paper sheet according to an input signal, and this includes a printer, a copying machine, a fax machine, and a multifunction printer incorporating these functions.

An electrophotographic image forming apparatus, which is a type of image forming apparatus, scans light on a photosensitive member charged to a predetermined potential to form an electrostatic latent image on the surface of the photosensitive member, and uses a developer supply unit that supplies a developer to the electrostatic latent image. Form a visible image. The visible image formed on the photosensitive member is transferred directly to the paper or transferred to the paper via the intermediate transfer unit, and the image transferred to the paper is fixed to the paper through the fixing process.

The image forming apparatus includes a rotating body such as a photosensitive member and a developing roller. In general, a rotating body such as a photosensitive member and a developing roller is provided to be detachable from the main body of the image forming apparatus. Rotate by. In this case, the coupling is provided in the image forming apparatus so that the driving force generated from the driving motor is smoothly transmitted to the rotating body such as the photosensitive member and the developing roller.

1A and 1B illustrate a structure in which driving force is transmitted to a photosensitive member of a conventional image forming apparatus.

As shown in FIG. 1, a conventional image forming apparatus includes an input gear 1001 to which a driving force of a driving motor (not shown) is input, a drive coupling 1002 integrally formed with the input gear 1001, and a drive. A driven coupling 1003 coupled to the coupling 1002 is complementary, a rotating shaft 1004 coupled to the driven coupling 1003, and a photosensitive member 1005 coupled to one end of the rotating shaft.

As illustrated in FIG. 1, image degradation may occur when the photosensitive member 1005, that is, the center of rotation 1006 of the rotating body and the center of rotation 1007 of the driving coupling 1003 are not parallel and inclined. . In particular, in a color image forming apparatus that forms an image using a plurality of colors, when parallelism is not made between the rotation centers 1003 and 1007, problems such as color overlap may occur.

In addition, the structure of the coupling may affect image quality, durability of the image forming apparatus, and the like.

It is an object of the present invention to provide an image forming apparatus having an improved power transmission structure through a coupling.

An image forming apparatus according to a preferred embodiment of the present invention for achieving this object is rotated by a rotating body, a rotating shaft coupled to the rotating body, a driven coupling coupled to the rotating shaft, and a driving force generated from a driving motor. And a dummy coupling having a through hole through which the rotating shaft penetrates, and is connected to the driving coupling on one side and is complementarily connected to the driven coupling on the other side. can do.

In addition, an inner diameter of the through hole of the dummy coupling may be larger than an outer diameter of the rotation shaft.

In addition, the inner diameter of the through hole of the dummy coupling may satisfy the following relationship.

Figure 112008089018637-PAT00001

here,

Figure 112008089018637-PAT00002

 d = outer diameter of the axis of rotation

 l = height of the torso of the dummy coupling

 W = overall height of the dummy coupling

D 2 = outer diameter of drive coupling

 a = (distance between body of drive coupling and body of driven coupling)-(total height of dummy coupling)

 b = distance between the center of rotation of the drive coupling and the center of rotation of the driven coupling

In addition, the dummy coupling may include a trunk portion and protrusions provided on both sides of the trunk portion, and the width of the protrusion portion of the dummy coupling may be provided to be narrower as the distance from the trunk portion increases.

In addition, the drive coupling and the driven coupling is provided with a projection provided on one side of the body portion and the body portion, respectively, the width of at least one of the protrusions of the protrusion of the drive coupling and the driven coupling is from the body portion. The farther it can be arranged to narrow.

In addition, the rotating body may be a photosensitive member.

In addition, the rotating body may be a developing roller.

In addition, the power transmission structure of the image forming apparatus of the preferred embodiment of the present invention is rotated by a rotating body, a rotating shaft coupled to the rotating body, a driven coupling coupled to the rotating shaft, and a driving force generated from a driving motor. And a dummy coupling having a drive coupling, a complementary connection to one side of the drive coupling, a complementary connection to the driven coupling on the other side, and a through hole through which the rotating shaft passes. Can be.

In addition, an inner diameter of the through hole of the dummy coupling may be larger than an outer diameter of the rotation shaft.

In addition, the inner diameter of the through hole of the dummy coupling may satisfy the following relationship.

Figure 112008089018637-PAT00003

here,

Figure 112008089018637-PAT00004

 d = outer diameter of the axis of rotation

 l = height of the torso of the dummy coupling

 W = overall height of the dummy coupling

D 2 = outer diameter of drive coupling

 a = (distance between body of drive coupling and body of driven coupling)-(total height of dummy coupling)

 b = distance between the center of rotation of the drive coupling and the center of rotation of the driven coupling

In addition, the dummy coupling may include a trunk portion and protrusions provided on both sides of the trunk portion, and the width of the protrusion portion of the dummy coupling may be provided to be narrower as the distance from the trunk portion increases.

In addition, an image forming apparatus of a preferred embodiment according to the present invention includes a photosensitive member, a rotating shaft coupled to the photosensitive member, a driven coupling coupled to the photosensitive member, a driving coupling rotated by a driving force generated from a driving motor, and one side. And a dummy coupling having a through hole through which the rotating shaft penetrates and is complementarily connected to the driving coupling, and complementarily connected to the driven coupling to the other side.

In addition, the image forming apparatus according to the preferred embodiment of the present invention includes a developing roller, a rotating shaft coupled to the developing roller, a driven coupling coupled to the developing roller, and a drive coupling rotated by a driving force generated from a driving motor. And a dummy coupling having a through hole through which the rotating shaft penetrates, and is complementarily connected to the driving coupling on one side, and complementarily connected to the driven coupling on the other side.

In the image forming apparatus according to the present invention, the power transmission structure through the coupling is improved.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing an image forming apparatus according to a first embodiment of the present invention.

As shown in Fig. 2, the image forming apparatus 1 includes an image reading unit 2 for reading an image recorded on an original, and a printing apparatus 3 for printing an image on paper.

The printing apparatus 3 prints an image according to a signal input from the image reading unit 2 or a signal input from an external device such as a PC. The main body 10, the paper feeding unit 20, and the optical scanning unit 30 are printed. ), Photosensitive member 40K, 40C, 40M, 40Y, charging device 50K, 50C, 50M, 50Y, developer supply part 60K, 60C, 60M, 60Y, transfer unit 70, developer recovery part 60K , 60C, 60M, 60Y), a fixing unit 90 and a discharge unit 93 are provided.

The main body 10 forms the appearance of the image forming apparatus and supports various components installed therein.

The paper feeding unit 20 includes a cassette 21 for storing the print medium S, a pickup roller 22 for picking up the print medium S stored in the cassette 21 one by one, and the picked up print medium S. ) Is configured to include a conveying roller 23 for conveying toward the transfer unit 50.

The optical scanning unit 30 irradiates the photoconductors 40K, 40C, 40M and 40Y with light corresponding to the image information to form an electrostatic latent image on the surface of the photoconductors 40K, 40C, 40M and 40Y.

The photosensitive members 40K, 40C, 40M, and 40Y are charged to a predetermined potential by the charging device 50Y before the light is scanned from the optical scanning unit 30, and scanned from the optical scanning unit 30 as described above. The electrostatic latent image is formed on the surface of each photosensitive member 40K, 40C, 40M, 40Y by light.

The charging devices 50K, 50C, 50M, and 50Y are scorotron type charging devices, which are one type of charging devices using corona discharge, but may be provided with a roller type charging device.

The developer supply unit 60K, 60C, 60M, 60Y supplies the developer to the electrostatic latent images formed on the photoconductors 40K, 40C, 40M, 40Y to form a visible image. Each developer supply unit 60K, 60C, 60M, 60Y accommodates a developer of different colors, for example, a developer of black, cyan, magenta and yellow colors.

The developer supply unit 60Y includes a case 61 having a developer accommodating chamber 62 and a stirring chamber 63 therein, transfer members 64a and 64b accommodated in the stirring chamber 63, and a stirring chamber. And a developing roller 65 for supplying the developer of (63) to the photosensitive member 40Y. For reference, in the present specification, a yellow color developer supply unit 60Y is described as an example, but the description may be equally applied to other black, cyan and magenta color developer supply units 60K, 60C, and 60M.

The transfer unit 70 includes an intermediate transfer belt 71, first transfer rollers 72, and a second transfer roller 73. The visible image formed on the photosensitive members 40K, 40C, 40M, 40Y is transferred to the intermediate transfer belt 71 by the first transfer rollers 72, and the image of the intermediate transfer belt 71 is transferred from the paper feeding unit 20. It is supplied and transferred to the paper passing between the second transfer roller 73 and the intermediate transfer belt 71.

The developer recovery sections 80K, 80C, 80M, and 80Y recover the waste developer remaining on the photoconductors 40K, 40C, 40M, and 40Y without being transferred to the intermediate transfer belt 71.

The fixing unit 90 includes a heating roller 91 and a pressure roller 92. The paper on which the image is transferred is passed between the heating roller 91 and the pressure roller 92. At this time, the image is fixed to the paper by heat and pressure. The sheet having passed through the fixing unit 90 is guided to the discharge unit 93 and discharged to the outside of the main body 10 of the printing apparatus 3 by the discharge roller 9a.

The image forming apparatus 1 of the present embodiment includes a developer assembly having a photosensitive member 40Y, a developer supply unit 60Y, a waste developer recovery unit 80Y, and a charging device 50Y. It is provided to be detachably attached to the main body at the time of parts replacement. With the developer assembly mounted on the main body, the driving force generated from the driving motor (not shown) provided in the main body is provided to the developing roller 65 of the photosensitive member 40Y and the developer supply unit 60Y through the power transmission structure of this embodiment. Delivered.

Hereinafter, a power transmission structure in which driving force is transmitted to the photosensitive member 40Y of the present embodiment will be described. However, this is exemplary, and the power transmission structure of the present invention is applicable not only to photosensitive members of different colors, but also to other rotating bodies of the image forming apparatus including the developing roller.

3 is a perspective view illustrating the dummy coupling according to the first embodiment of the present invention separately from the driving coupling and the driven coupling of the image forming apparatus, and FIG. 4 illustrates the dummy coupling according to the first embodiment of the present invention. 5 is a perspective view illustrating a state in which the drive coupling and the driven coupling are connected, and FIG. 5 is a cross-sectional view illustrating the connection state of FIG. 4. 6 is a view briefly showing FIG. 5.

3 to 5, the image forming apparatus of the present embodiment includes a photosensitive member 40Y, a rotation shaft 130 coupled to the photosensitive member 40Y, and a driven coupling 120 coupled to the rotation shaft 130. ), A drive coupling 110, and a dummy coupling 140 connected to the drive coupling 110 on one side and complementarily connected to the driven coupling 120 on the other side. do.

The driving coupling 110 includes a body portion 111 and a protrusion 112 protruding from the body portion 111 toward the photosensitive member 40Y side. The driving coupling 110 is integrally formed with the input gear 150 engaged with the driving gear 160, and the driving force generated from the driving motor (not shown) is driven through the driving gear 160 and the input gear 150. Delivered to the drive coupling 110. In the present embodiment, the input gear 150 and the driving coupling 110 are integrally formed, but may be formed separately. Of course, the pulley is integrally formed in the drive coupling, it is natural that the driving force transmission through the belt may be made.

The driven coupling 120 includes a body portion 121 and a protrusion portion 122 protruding from the body portion 121 toward the opposite side of the photoconductor 40Y.

The dummy coupling 140 includes a body 141 and protrusions 142 and 143 provided on both sides of the body 141. The protrusion 142 is connected to the protrusion 112 of the driving coupling 110, and the protrusion 143 is connected to the protrusion 122 of the driven coupling 120. In other words, the dummy coupling 140 of the present embodiment is complementarily connected to the driving coupling 110 on one side and complementarily connected to the driven coupling 120 on the other side.

The dummy coupling 140 further includes a through hole 145 through which the rotation shaft 130 of the photosensitive member 40Y passes. As a result, the separation of the dummy coupling 140 is prevented, thereby ensuring a stable power transmission through the dummy coupling 140.

As shown in FIG. 5, the dummy coupling 140 may be connected to the driving coupling 110 and the driven coupling 120 at an angle inclined, and for this purpose, the dummy coupling ( The inner diameter D of the through hole 145 of the 140 may be larger than the outer diameter d of the rotation shaft 130.

In this case, the inner diameter D of the through hole 145 of the dummy coupler satisfies the following expression.

Figure 112008089018637-PAT00005
(Eq. 1)

 d = outer diameter of the axis of rotation

 l = height of the torso of the dummy coupling

 θ = angle at which the dummy coupling is tilted

In order to eliminate θ of (Equation 1), FIG. 5 is simply expressed as in FIG. 6. Specifically, the dummy coupling 140 is illustrated as a square box, and the driving coupling 110 only shows the body portion 111. In addition, one point of the dummy coupling 140 is defined as the origin O, and a point where the dummy coupling 140 meets the driving coupling 110 in a tilted state is represented by P2, and the dummy coupling 140 is represented. The point of the dummy coupling 140 corresponding to P2 in this non-tilt state is represented by P1. Under these conditions, P1 and P2 are expressed as the coordinates of the origin O as follows.

P 1 (W, D 1 -δ), P 2 (W + a, D 2 -b)

W = overall height of the dummy coupling

D 1 = outer diameter of the dummy coupling

D 2 = outer diameter of drive coupling

a = (distance between body of drive coupling and body of driven coupling)-(total height of dummy coupling)

b = distance between the center of rotation of the drive coupling and the center of rotation of the driven coupling

At this time, α and θ are calculated using the coordinates of P 1 , P 2 (W + a, D 2 -b) as follows.

Figure 112008089018637-PAT00006
(Eq. 2)

Figure 112008089018637-PAT00007
(Eq. 3)

Here, and using the fact that the distance of the straight line OP 1 and OP 2 are the same, it is possible to obtain an equation for δ as follows:

Figure 112008089018637-PAT00008
(Eq. 4)

When δ of (Eq. 4) is inserted into (Eq. 3), θ is derived as follows.

Figure 112008089018637-PAT00009
(Eq. 5)

That is, the overall height (W) of the dummy coupling, the outer diameter (D 1 ) of the dummy coupling, the outer diameter (D 2 ) of the drive coupling, the distance and the dummy between the body of the drive coupling and the body of the driven coupling Under the condition that the difference in the total height of the coupling (a), the distance between the center of rotation of the drive coupling and the center of rotation of the driven coupling (b) is constant, the dummy couple at an angle θ as shown in Eq. The ring is tilted. In order to prevent interference between the inner diameter of the dummy coupler and the rotating shaft at the angle θ, (Equation 1) must be satisfied. In other words, when the conditions of W, D 1 , D 2 , a, and b are determined, the dummy coupling must satisfy (Equation 1) in order to smoothly incline with respect to the driving coupling and the driven coupling.

With this structure, in the image forming apparatus of this embodiment, even when the rotation center 113 of the drive coupling 110 and the rotation center 123 of the driven coupling 120 are shifted, the dummy coupling 140 is removed. The stable power transmission is possible. In other words, as shown in FIG. 5, the center of rotation 113 of the drive coupling 110 and the center of rotation 123 of the driven coupling 120 are inconsistent due to mounting conditions, component tolerances, and the like of the photosensitive member 40Y. Even if this happens, in the image forming apparatus of this embodiment, the power transmission is a dummy couple in a state where the rotation center 113 of the drive coupling 110 and the rotation center 123 of the driven coupling 120 are kept in parallel. As it is made through the ring 140, rotational speed fluctuations, vibration, noise, image degradation, etc. are minimized.

At this time, the widths 142a and 143 of the protrusions 142 and 143 of the dummy coupling 140 of the present embodiment become narrower as they move away from the body portion 141 (see FIG. 3). Accordingly, the dummy coupling 140 is more naturally connected to the drive coupling 110 and the driven coupling 120. In other words, when the width of the protrusion of the dummy coupling is constant, the protrusion of the dummy coupling is connected with the protrusion of the drive coupling or the protrusion of the driven coupling so tightly that the dummy coupling is the drive coupling or the driven. It may be difficult to connect obliquely to the coupling. In particular, this tight connection is likely to occur between the dummy coupling and the drive coupling. However, as described above, since the widths 112a and 122a of the protrusions 112 and 122 of the present embodiment are formed to become narrower as they move away from the trunk portion 111, such a tight connection is unlikely to occur. .

The embodiments described above are illustratively described, and the present invention may be modified in various ways.

For example, FIG. 7 is a perspective view illustrating the dummy coupling according to the second embodiment of the present invention separately from the driving coupling and the driven coupling of the image forming apparatus, and the protrusions of the driving coupling 210 of the present embodiment ( The width 212a of 212 and the width 222a of the protrusion 222 of the driven coupling 220 are formed to become narrower as they move away from the trunk portions 211 and 221, respectively, so that the dummy coupling 240 is driven. It is possible to incline naturally with respect to the coupling 210 or the driven coupling 220.

Of course, the width of the projection of any one of the projection of the drive coupling and the projection of the driven coupling may be provided so that the narrower the further away from the body portion.

1 is a perspective view showing a power transmission structure using a coupling of a conventional image forming apparatus.

2 is a cross-sectional view showing an image forming apparatus according to a first embodiment of the present invention.

3 is a perspective view showing a dummy coupling separately from a driving coupling and a driven coupling of an image forming apparatus according to a first embodiment of the present invention.

4 is a perspective view showing a state in which the dummy coupling according to the first embodiment of the present invention is connected to the driving coupling and the driven coupling.

5 is a cross-sectional view illustrating a connection state of FIG. 4.

FIG. 6 is a schematic view of FIG. 5.

7 is a perspective view illustrating a dummy coupling separated from a driving coupling and a driven coupling of an image forming apparatus according to a second embodiment of the present invention.

Description of the Related Art [0002]

1 Image forming apparatus 3 Printing apparatus

10 Main Unit 20 Paper Feeding Unit

30 Gwangju Unit 40Y Photosensitive Body

50Y charging device 60Y developer supply unit

70 Transfer Unit 80Y Waste Development Collection

90 Fusing unit 110 drive coupling

120 driven coupling 130 rotating shaft

140 Dummy Coupling 141 Torso

142, 143 protrusion 145 through hole

Claims (13)

A rotating body, A rotating shaft coupled to the rotating body, A driven coupling coupled to the rotating shaft; A drive coupling rotated by a drive force generated from the drive motor, An image comprising a dummy coupling having a through hole through which the rotating shaft penetrates and is complementarily connected to the driving coupling on one side and complementary to the driven coupling on the other side. Forming device. The method of claim 1, And an inner diameter of the through hole of the dummy coupling is larger than an outer diameter of the rotation shaft. The method of claim 2, And an inner diameter of the through hole of the dummy coupling satisfies the following relationship.
Figure 112008089018637-PAT00010
 here,
Figure 112008089018637-PAT00011
  d = outer diameter of the axis of rotation  l = height of the torso of the dummy coupling  W = overall height of the dummy coupling D 2 = outer diameter of drive coupling  a = (distance between body of drive coupling and body of driven coupling)-(total height of dummy coupling)  b = distance between the center of rotation of the drive coupling and the center of rotation of the driven coupling The method of claim 1, The dummy coupling includes a body portion and protrusions provided on both sides of the body portion, And the width of the protrusion of the dummy coupling becomes narrower as it moves away from the body. The method of claim 1, The drive coupling and the driven coupling is provided with a projection provided on one side of the body portion and the body portion, And the width of at least one of the protrusions of the drive coupling and the protrusions of the driven coupling is narrower away from the trunk. The method of claim 1, And the rotating body is a photosensitive member. The method of claim 1, And the rotating body is a developing roller. A rotating body, A rotating shaft coupled to the rotating body, A driven coupling coupled to the rotating shaft; A drive coupling rotated by a drive force generated from the drive motor, An image comprising a dummy coupling having a through hole through which the rotating shaft penetrates and is complementarily connected to the driving coupling on one side and complementary to the driven coupling on the other side. Power transmission structure of the forming apparatus. The method of claim 8, And an inner diameter of the through hole of the dummy coupling is larger than an outer diameter of the rotating shaft. 10. The method of claim 9, And an inner diameter of the through hole of the dummy coupling satisfies the following relationship.
Figure 112008089018637-PAT00012
 here,
Figure 112008089018637-PAT00013
  d = outer diameter of the axis of rotation  l = height of the torso of the dummy coupling  W = overall height of the dummy coupling D 2 = outer diameter of drive coupling  a = (distance between body of drive coupling and body of driven coupling)-(total height of dummy coupling)  b = distance between the center of rotation of the drive coupling and the center of rotation of the driven coupling The method of claim 8, The dummy coupling includes a body portion and protrusions provided on both sides of the body portion, And the width of the protrusion of the dummy coupling narrows as it moves away from the body. With photoreceptor, A rotating shaft coupled to the photosensitive member, A driven coupling coupled to the photosensitive member, A drive coupling rotated by a drive force generated from the drive motor, An image comprising a dummy coupling having a through hole through which the rotating shaft penetrates and is complementarily connected to the driving coupling on one side and complementary to the driven coupling on the other side. Forming device. With the development roller, A rotating shaft coupled to the developing roller; A driven coupling coupled to the developing roller, A drive coupling rotated by a drive force generated from the drive motor, An image comprising a dummy coupling having a through hole through which the rotating shaft penetrates and is complementarily connected to the driving coupling on one side and complementary to the driven coupling on the other side. Forming device.
KR1020080133914A 2008-12-24 2008-12-24 Image forming apparatus KR20100075266A (en)

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