KR20150031027A - POWER TRANSFER UNIT FOR Photosensitive drum - Google Patents

POWER TRANSFER UNIT FOR Photosensitive drum Download PDF

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Publication number
KR20150031027A
KR20150031027A KR20130110492A KR20130110492A KR20150031027A KR 20150031027 A KR20150031027 A KR 20150031027A KR 20130110492 A KR20130110492 A KR 20130110492A KR 20130110492 A KR20130110492 A KR 20130110492A KR 20150031027 A KR20150031027 A KR 20150031027A
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KR
South Korea
Prior art keywords
power transmission
photosensitive drum
power
torsion groove
receiving flange
Prior art date
Application number
KR20130110492A
Other languages
Korean (ko)
Inventor
조남혁
Original Assignee
조남혁
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Publication date
Application filed by 조남혁 filed Critical 조남혁
Priority to KR20130110492A priority Critical patent/KR20150031027A/en
Publication of KR20150031027A publication Critical patent/KR20150031027A/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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

The present invention relates to a power transmission device for a photosensitive drum, which can effectively perform driving force transmission by transmitting power coaxially from a power transmission apparatus of a main body of an electrophotographic image forming apparatus. The power transmission device for a photosensitive drum according to the present invention comprises: a power transmission block inserted into a torsion groove when a cartridge is mounted; a power accommodation flange mounted to one end of the photosensitive drum; and a power transmission pin inserted through the power transmission block and the power accommodation flange. The power accommodation flange includes a support hole provided along a central axis in a longitudinal direction, where a cross section is in a prism shape, and a coupling unit inserted and mounted inside a cylinder of the photosensitive drum.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a photosensitive drum,

The present invention relates to a photosensitive drum provided in a cartridge used in an electrophotographic image forming apparatus, and more particularly to a power transmission mechanism for a photosensitive drum.

In an electrophotographic image forming apparatus including an electrophotographic copying machine, an electrophotographic printer, a laser printer, a facsimile apparatus or the like, it is common that a development cartridge detachably mountable to the apparatus main body is applied, Are provided integrally.

In such an electrophotographic image forming apparatus, the driving force generated from the driving apparatus provided in the apparatus main body is transmitted to the photosensitive drum and the respective processing means inside the cartridge by the power transmission mechanism.

Various techniques have been developed for longitudinal positioning of a photosensitive drum in relation to a power transmitting member for a conventional photosensitive drum and a method for fixing the position of the photosensitive drum by generating axial thrust by applying a helical gear, And a method of applying a spring member for fixing the position to either the driven portion or the driving portion together with the above-mentioned spring. However, these methods can not avoid force transmission in the direction perpendicular to the axis, and as the rotation of the photosensitive drum continues, the shaking phenomenon becomes more serious.

A driving force needs to be transmitted on the coaxial line between the driving part and the driven part in order to improve the above-mentioned wobble phenomenon, and a representative technique related thereto is disclosed in Korean Patent No. 10-0417149. According to the patent, a driving device provided in the apparatus main body is provided with a torsion groove, and a flange coupled to an end side of the photosensitive drum integrally includes a projection of polygonal prism shape inserted into the torsion groove, And the protrusions engage with each other to transmit the driving force. It is known that such a power transmission mechanism can transmit the driving force very effectively in a state in which the shaking phenomenon is suppressed.

On the other hand, even when the life of the integral type developing cartridge is short, all the processing means other than the photosensitive drum of the specified specification can be reused, so that an industrial field of reproducing cartridges is formed by refilling the toner and replacing the photosensitive drum of the specified specification . In this case, in the electrophotographic image forming apparatus employing the power transmission mechanism according to the above patent, since the flange as the power transmitting member is integrally provided with the projecting portion, the specifications of the photosensitive drum provided integrally with the flange, There is an inconvenience and inefficiency to newly replace the photosensitive drum in which all of the component elements are re-manufactured according to the model when replacing the photosensitive drum.

An object of the present invention is to provide a power transmission mechanism for a photosensitive drum of a cartridge in which driving force transmission can be efficiently performed.

Another object of the present invention is to provide a general-purpose photosensitive drum and a power transmission mechanism therefor that can be applied even if the shape of the torsion groove provided in the new model of the electrophotographic image forming apparatus is changed.

The gist of the present invention related to the above problem is as follows.

(1) A power transmission mechanism for a photosensitive drum of a cartridge in which one end of the cartridge is detachably mounted in a twist groove having a plurality of corners in a main body of the electronic image forming apparatus, A power transmission block to be driven; A power receiving flange mounted on one end of the photosensitive drum; And a power transmitting pin inserted through the power transmitting block and the power receiving flange, wherein the power transmitting block includes a through hole in which an inner wall surface is gear-processed, a plurality of Wherein the power receiving flange includes a support hole provided along the longitudinal center axis and having a square cross section and a coupling portion inserted and mounted inside the cylinder of the photosensitive drum, A gear portion corresponding to the through hole and corresponding main portions corresponding to the support hole, and the rotational force of the torsion groove is sequentially transmitted through the power transmission block, the power transmission pin, and the power receiving flange, And the drum is rotated.

(2) The power transmission mechanism for a photosensitive drum according to (1), wherein the cross section of the torsion groove is an isosceles triangle, and the cross section of the power transmission block is an isosceles triangle.

(3) The photosensitive drum according to (1), wherein the engaging step is formed inside the end portion of the through hole of the power transmission block, and the end portion of the power transmitting pin is formed with a horizontal extending portion located at the engaging end. Power transmission mechanism for.

 (4) The power transmission mechanism for a photosensitive drum according to (1), wherein the power transmission block has a reduced cross-sectional area in a torsion groove direction.

 (5) The power transmission mechanism for a photosensitive drum according to (1), wherein the power receiving flange is provided with a slide portion that is received in a bearing provided in the cartridge.

(6) The power transmission mechanism for a photosensitive drum according to (1), wherein a protrusion for attracting the power transmission block in the torsional direction of the torsion groove is formed at an end of the torsion groove of the power receiving flange.

(7) The power transmitting block according to (1), wherein the power transmitting block is drawn in a torsion groove direction when the torsion groove is rotated, and the power transmitting pin is attracted in a direction opposite to the torsion groove. Delivery mechanism.

The power transmitting mechanism for the photosensitive drum of the cartridge according to the present invention can effectively transmit the driving force by transmitting the power from the power transmitting device of the main body of the electrophotographic image forming apparatus on the coaxial.

Even in the case of reusing the developing cartridge of the new model electronic image forming apparatus, replacement of only the power transmission block corresponding to the modified torsion groove provided in the main body of the new model, The cost can be minimized and a general-purpose photosensitive drum can be provided.

1 is an exploded perspective view of a power transmission mechanism for a photosensitive drum according to an embodiment of the present invention.
2 is a partially enlarged sectional view of a power transmission mechanism for a photosensitive drum according to the embodiment of FIG.
3 is a top view and cross-sectional view of a power transmission block according to an embodiment of the present invention.
4 is a sectional view of a power receiving flange according to an embodiment of the present invention;
5 is a cross-sectional view of a power transmission pin according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or similar reference numerals are given to the same or equivalent elements in the drawings, and in the specification, when a component is referred to as "including ", unless the context clearly indicates otherwise, But may include other components.

The present invention relates to a power transmission mechanism for a photosensitive drum, wherein the photosensitive drum constitutes one element of a process cartridge which integrally includes a charging device, a developing device or a cleaning device. The process cartridge is detachably mounted to the main body of the electronic image forming apparatus as in the prior art, and is connected to the driving force transmitting means provided in the main body at the end portion of the photosensitive drum among the components of the cartridge.

FIG. 1 is an exploded perspective view of a power transmission mechanism for a photosensitive drum according to an embodiment of the present invention, and FIG. 2 is a partially developed sectional view of a power transmission mechanism for a photosensitive drum according to FIG.

The power transmitting mechanism 10 according to the embodiment includes a power transmitting block 110 inserted into the tortuous groove 20 as driving force transmitting means provided in the main body when the cartridge is mounted, And a power transmission pin 130 inserted through the power transmission block and the power receiving flange. Fig. 3 is a plan view and a sectional view of the power transmission block, Fig. 4 is a sectional view of the power receiving flange, and Fig. 5 is a sectional view of the power transmission pin.

The power transmitting block 110 has a substantially plate-like shape and is a driving force transmitting means provided in a main body (not shown) of the electronic image forming apparatus and is inserted into the torsion groove 20 when the driving shaft 210 is rotationally driven It engages. A plurality of protrusions 112 are formed on the periphery of the power transmission block 110 and the protrusions 112 are in contact with the inner wall surface of the torsion groove 20. In this embodiment, the cross-sectional area of the power transmission block 110 engaged with the torsion groove 20 is also equal to the cross-sectional area of the torsion groove 20, Triangles are preferred.

A through hole 114 is provided at the center of the power transmission block 110 to receive a portion of the end of the power transmission pin 130. The inner wall surface of the through hole 114 is formed with a gear or a screw such as a helical gear for transmitting the rotational force transmitted from the torsion groove 20 to the power transmission pin 130, The gear portion 132 is formed. It is preferable that the gear or the screw is machined in a direction to push the power transmission pin 130, which will be described later, from the torsion groove.

The through hole 114 and the gear portion 132 are advantageously made wider as the contact area between the through hole 114 and the gear portion 132 is wider. On the other hand, when the thickness of the power transmission block 110 is thin, And is protruded and formed in a columnar shape outwardly from the base portion of the base plate. In this case, the protrusion direction of the through-hole is preferably formed in a direction facing the torsion groove, so that the shape of the power transmission block 110 is tapered in a direction facing the torsion groove, The torsion grooves of the power transmission block 110 can be more easily entered.

Optionally, an engaging end 116 is formed inside the end of the through hole 114 of the power transmission block 110 and the engaging end 116 is formed at the end of the power transmission pin 130, A horizontal extending portion 136 is formed. In the course of the transmission of the driving force, the horizontal extension portion 136 is constrained by the engagement end 116 to control the movement of the power transmission pin 130 in the direction opposite to the drive shaft 210.

The power receiving flange 120 includes a photosensitive drum 30 having a drum cylinder 310 formed of a non-magnetic electrical conductor material such as aluminum and provided with a photosensitive layer on an outer circumferential surface, to be. The other end of the photosensitive drum 30 is fixed to the cartridge frame by another flange element (not shown).

The power receiving flange 120 has a generally circular cross section and has a coupling portion 122 inserted into the drum cylinder 310 at one end and a bearing (not shown) provided at the cartridge frame at the other end, Respectively. A first gear portion 135 for transmitting a driving force to a developing roller (not shown) of the developing device may be provided outside the power receiving flange 120, and a transfer roller And a second gear portion 136 for transmitting the driving force to the second gear portion 136. [ The first gear portion 135 and the second gear portion 136 may be either helical or spur gears.

At the center of the power receiving flange 120, there is provided a support hole 138 passing through along the longitudinal center axis and having a square cross section. Corresponding to the support hole 138, each end 134 of the power transmission pin 130 has a square cross section at its end opposite to the gear portion 132. In this case, the support hole 138 and the circumferential portion 134 have substantially the same cross-sectional area and cross-sectional area, and are constrained to each other in the power transmission process.

Alternatively, the projecting portion 139 may be formed at the end of the sliding portion 134 of the power receiving flange 120, that is, at the end portion in the torsion groove 20 direction. The protrusion 139 separates the power transmission block 110 from the sliding part 134 by a predetermined distance so that the power transmission block 110 is easily guided and inserted inward in the torsion groove 20. In this case, the diameter of the projecting portion 139 is preferably smaller than the diameter of the inscribed circle of the polygonal cross section of the power transmission block 110.

The power transmission pin 130 is a driving force transmitting element and is made of a metal material as a grounding means for the drum cylinder 310. An electrically grounded contact 220 is provided at the inner center portion of the torsion groove 20 and contacts the end of the power transmission pin 130 when the cartridge is mounted. The ground plate 320 is attached to the end surface of the coupling portion 122 of the power receiving flange 120 and the drum cylinder 310 and is provided with a power transmitting pin (130).

Next, the operation of the power transmission mechanism 10 according to the present invention will be described.

When the drive shaft 210 is rotationally driven with the protrusions 112 inserted in the torsion grooves 20, the vertexes of the plurality of protrusions 112 are guided so as to be equally adjacent to the inner wall surface of the torsion groove 20, Thus, the rotation axis of the power transmission block 110 and the rotation axis of the torsion groove 20 are aligned in the same manner. In this case, it is preferable that the twisting direction of the torsion groove 20 is moved toward the inside of the torsion groove by the rotation of the torsion groove 20 so that the power transmission can be effectively performed.

The driving force transmitted to the power transmitting block 110 is caused to rotate the power transmitting pin 130 by the engagement between the gear portion 132 of the power transmitting pin 130 and the gear or threaded through hole 114. It is preferable that the power transmitting pin 130 is attracted in the direction opposite to the tortuous groove 20 in accordance with the rotation of the gear or screw forming direction of the wall portion of the through hole 114 and the gear portion 132 .

The driving force transmitted to the power transmitting pin 130 is transmitted to the power receiving flange 120 by the engagement of the main portion 134 of the power transmitting pin 130 with the supporting hole 138 of the power receiving flange 120 . The drum cylinder 310 coupled to the outside of the coupling portion 122 of the power receiving flange 120 is rotated and the first gear portion 135 and the second gear portion provided outside the power receiving flange 120 rotate, Thereby rotating the developing roller and the transfer roller.

One end of the power transmission pin 130 is in electrical contact with the ground contact 220 provided at the inner center portion of the torsion groove 20 and the other end is in contact with the end surface of the coupling portion 122 of the power receiving flange 120, The drum cylinder 310 is brought into electrical contact with the ground plate 320 attached to the drum cylinder 310 so that the drum cylinder 310 is electrically grounded to the ground contact 220 through the power transmission pin 130.

The foregoing is a description of specific embodiments of the present invention. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments or constructions. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It should be understood that this is possible.

For example, in the embodiment, the torsion groove 20 may have a twisted prism shape in which a cross section that is commonly used is a substantially isosceles triangle, but the present invention is not limited thereto.

In the embodiment, the sectional area of the power transmission block 110 engaged with the torsion groove 20 is also an isosceles triangle. However, it is also possible to provide the torsion groove 20 with an element corresponding to the protrusion 112 contacting the inner wall surface of the torsion groove 20 The cross-sectional area is not particularly limited. Further, with respect to the shape in which the cross-sectional area of the power transmission block is tapered in the torsion groove direction is reduced, a shape in which the circular through hole 114 protrudes in the torsion groove direction from the triangular protrusion 112 is deformed And the protruding portion 112 of the triangular shape is tapered in the torsion groove direction so that the through hole 114 is formed at the center portion thereof while having a triangular-pyramidal shape as a whole.

In addition, the cross-sectional area of each of the main portion of the power transmission pin 130 and the support hole 138 of the power receiving flange 120 is not particularly limited as long as it can be constrained to each other during rotation, It is also possible to substitute for knurling or gear processing.

It is therefore to be understood that all such modifications and alterations are intended to fall within the scope of the invention as disclosed in the following claims or their equivalents.

10: Power transmission mechanism 110: Power transmission block
112: protrusion 114: through hole
116: engaging end 120: power receiving flange
122: coupling portion 134:
135: first gear portion 136: second gear portion
138: Support hole 139: Projection
130: Power transmission pin 132:
134: each main part 136: horizontal extension part
20: torsion groove 210: drive shaft
220: grounding contact 30: photosensitive drum
310: drum cylinder 320: ground plate

Claims (7)

A power transmission mechanism for a photosensitive drum of a cartridge, the one end of which is detachably mounted in a twist groove having a plurality of corners in a main body of the electronic image forming apparatus,
A power transmitting block inserted into the torsion groove when the cartridge is mounted; A power receiving flange mounted on one end of the photosensitive drum; And a power transmission pin inserted through the power transmission block and the power receiving flange,
Wherein the power transmission block includes a through hole in which an inner wall surface is gear-processed, and a plurality of protrusions formed along the peripheral edge and contacting the inside of the torsion groove,
Wherein the power receiving flange includes a support hole provided along the longitudinal central axis and having a square cross section and a coupling portion inserted and mounted inside the cylinder of the photosensitive drum,
Wherein the power transmission pin includes a gear portion corresponding to the through hole and each main portion corresponding to the support hole,
Wherein the rotational force by the torsion groove is sequentially transmitted through the power transmitting block, the power transmitting pin, and the power receiving flange to rotate the photosensitive drum.
The power transmission mechanism for a photosensitive drum according to claim 1, wherein the cross section of the torsion groove is an isosceles triangle, and the cross section of the power transmission block is an isosceles triangle.
2. The image forming apparatus as claimed in claim 1, wherein a latching end is formed inside an end of the through hole of the power transmission block, and a horizontal extending portion located at the latching end is formed at an end of the power transmission pin. Delivery mechanism.
2. The power transmission mechanism for a photosensitive drum according to claim 1, wherein the power transmission block has a reduced cross-sectional area in a torsion groove direction.
The power transmission mechanism for a photosensitive drum according to claim 1, wherein the power receiving flange is provided with a slide portion that is received in a bearing provided in the cartridge.
The power transmission mechanism for a photosensitive drum according to claim 1, wherein a protruding portion for guiding the power transmission block in the torsion groove direction is formed at an end of the torsion groove direction of the power receiving flange.
2. The power transmission mechanism for a photosensitive drum according to claim 1, wherein the power transmission block is drawn in a torsion groove direction when the torsion groove is rotated, and the power transmission pin is attracted in a direction opposite to the torsion groove.
KR20130110492A 2013-09-13 2013-09-13 POWER TRANSFER UNIT FOR Photosensitive drum KR20150031027A (en)

Priority Applications (1)

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KR20130110492A KR20150031027A (en) 2013-09-13 2013-09-13 POWER TRANSFER UNIT FOR Photosensitive drum

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113574469A (en) * 2019-03-18 2021-10-29 佳能株式会社 Electrophotographic image forming apparatus, cartridge and drum unit
KR20240054574A (en) 2022-10-19 2024-04-26 크로바텍 주식회사 Floor Impact Sound Blocking Structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113574469A (en) * 2019-03-18 2021-10-29 佳能株式会社 Electrophotographic image forming apparatus, cartridge and drum unit
KR20240054574A (en) 2022-10-19 2024-04-26 크로바텍 주식회사 Floor Impact Sound Blocking Structure

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