EP2703893B1 - Lichtempfindlicher trommelantriebskopf und antriebsmechanismus für eine bildgebungsvorrichtung - Google Patents

Lichtempfindlicher trommelantriebskopf und antriebsmechanismus für eine bildgebungsvorrichtung Download PDF

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Publication number
EP2703893B1
EP2703893B1 EP12868927.0A EP12868927A EP2703893B1 EP 2703893 B1 EP2703893 B1 EP 2703893B1 EP 12868927 A EP12868927 A EP 12868927A EP 2703893 B1 EP2703893 B1 EP 2703893B1
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EP
European Patent Office
Prior art keywords
driving head
photosensitive drum
image forming
forming apparatus
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP12868927.0A
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English (en)
French (fr)
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EP2703893A4 (de
EP2703893A1 (de
Inventor
Junzhong Wu
Qingfei Peng
Jianxin Cao
Jinlian Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ninestar Corp
Original Assignee
Apex Technology Co Ltd
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Filing date
Publication date
Priority claimed from CN201210232590.1A external-priority patent/CN102866609B/zh
Application filed by Apex Technology Co Ltd filed Critical Apex Technology Co Ltd
Publication of EP2703893A1 publication Critical patent/EP2703893A1/de
Publication of EP2703893A4 publication Critical patent/EP2703893A4/de
Application granted granted Critical
Publication of EP2703893B1 publication Critical patent/EP2703893B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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

Definitions

  • the invention relates to a photosensitive drum driving head and a driving mechanism for an image forming apparatus.
  • the traditional, image forming apparatus comprises a motor, a driving head for an image forming apparatus and a process cartridge, wherein the process cartridge is detachably mounted in the image forming apparatus and provided with a photosensitive drum and a photosensitive drum driving head fixedly connected to the end portion of the photosensitive drum.
  • the power is generated by the motor and transmitted to the process cartridge via the engagement between the driving head for the image forming apparatus and the photosensitive drum driving head, so as to make the photosensitive drum on the process cartridge rotate.
  • the prior art photosensitive drum driving head is fixedly arranged at one end of a photosensitive drum 7 and comprises a convex connection shaft 17 provided with a twisted projection17a having an end surface 17a1; a rotation center of the convex connection shaft 17 and a rotation center of the photosensitive drum 7 are aligned; and a concave connection shaft 18 comprise a twisted recess 18a and a bottom surface 18a1 is provided on the recess 18a.
  • the driving head 18 for the image forming apparatus receives the rotary power from the motor; the convex connection shaft 17 is engaged with the driving head 18 for the image forming apparatus; and the rotary power is transmitted to the convex connection shaft 17 through the driving head 18 of the image forming apparatus and finally makes the photosensitive drum rotate.
  • the twisted projection 17a on the convex connection shaft 17 is interposed into the twisted recess 18a in the driving head 18 of the image forming apparatus; the end face 17a1 is directly opposite to the bottom surface 18a2; and the rotary power on the driving head 18 of the image forming apparatus is transmitted to the convex connection shaft 17 via the engagement between the twisted projection 17a and the recess 18a.
  • FIGS. 3 and 4 are sectional views of the prior art photosensitive drum driving head respectively illustrating the state when the twisted projection 17a and the twisted recess 18a do not rotate and rotate.
  • both cross sections of the twisted projection 17a and the twisted recess 18a take the shape of triangles (such as equilateral triangles), and the dimension of the triangular projection 17a is less than that of the triangular recess 18a.
  • FIG. 1 illustrates of the prior art photosensitive drum driving head respectively illustrating the state when the twisted projection 17a and the twisted recess 18a do not rotate and rotate.
  • both cross sections of the twisted projection 17a and the twisted recess 18a take the shape of triangles (such as equilateral triangles), and the dimension of the triangular projection 17a is less than that of the triangular recess 18a.
  • R0 refers to the diameter of a rotation circle of the three vertex angles 17a2 of the projection 17a
  • R1 refers to the diameter of an inscribed circle of the triangular recess 18a
  • R2 refers to the diameter of a rotation circle of three vertex angles of the recess 18a.
  • FIG. 5 illustrates another embodiment of the prior art.
  • both the twisted projection 17a and the twisted recess 18a take the shape of quadrilaterals (such as squares) and are engaged with each other for power transmission.
  • the driving head of the image forming apparatus may also adopt the mode as illustrated in FIG. 6 .
  • a twisted recess 28a is formed at one end of a driving head 28 of the image forming apparatus and provided with a bottom surface 28a1 and a projection 28a2 which is disposed at the center of the twisted triangular recess 28a (a rotation center of the boss is aligned with a rotation axis X2 of the driving head of the image forming apparatus).
  • the height of the projection 28a2 is substantially the same with the depth of the recess 28a, and the projection may be conical.
  • the photosensitive drum with the photosensitive drum driving head is widely used in a process cartridge for the traditional image forming apparatus.
  • the process cartridge at least comprises a photosensitive drum, a developer and a developing roller, wherein the photosensitive drum used for forming an electrostatic latent image is provided with the photosensitive drum driving head; the developer is used for developing the electrostatic latent image; and the developing roller is used for transmitting the developer to the photosensitive drum.
  • prior art document CN 102 087 494 A discloses a photosensitive drum driving assembly, a photosensitive drum and a processing cartridge as described above.
  • the invention provides a photosensitive drum driving head and a driving mechanism for an image forming apparatus to solve the technical problem of high accuracy requirement on the twist angles of a twisted projection and a twisted recess of the traditional photosensitive drum driving head due to the engagement between the twisted projection and the twisted recess.
  • the invention adopts the technical proposal that:
  • the convex tooth is provided with a first side face and a second side face being a graded bevel gradually varied towards the root of the convex tooth along the end portion of the convex tooth.
  • the convex tooth is provided with a mating surface parallel to an axial line of the photosensitive drum, the mating surface being arranged to engage with the edge of a twisted bevel in the recess of the driving head of the image forming apparatus to transmit power.
  • the convex teeth, engaged with the power transmission portions, of the photosensitive drum driving head are configured to be vertical teeth. Therefore, the technical problem of high accuracy requirement on the twist angles of the twisted boss and the twisted recess of the traditional photosensitive drum driving head due to the engagement between the twisted boss and the twisted recess can be solved.
  • FIGS. 7 and 8 are respectively a perspective view and a top view of a driving head of an image forming apparatus.
  • the driving head 20 of the image forming apparatus comprises a recess 11, power transmission portions 11a and retainer portions 11b, wherein the recess 11 has an equilateral triangle cross section; the power transmission portions 11a are arranged at three vertex angles of the triangle and have twisted structures; the retainer portions 11b are disposed on three edges of the triangle; and the power transmission portions 11a are provided with twisted bevels 11a1 and guide bevels 11a2.
  • the driving head 20 of the image forming apparatus comprises a recess 11, power transmission portions 11a and retainer portions 11b, wherein the recess 11 has an equilateral triangle cross section; the power transmission portions 11a are arranged at three vertex angles of the triangle and have twisted structures; the retainer portions 11b are disposed on three edges of the triangle; and the power transmission portions 11a are provided with twisted bevels 11a1 and guide bevels 11a
  • the twisted bevels 11a1 are invisible; the included angle between the twisted bevels 11a1 and a bottom surface of the recess is less than 90 DEG; edges 11a3 are formed on the top of the twisted bevels 11a1; the guide bevels 11a2 are visible; and the included angle between the guide bevels 11a2 and the bottom surface of the recess is more than 90 DEG.
  • the driving head of the image forming apparatus is connected with a motor in the image forming apparatus to transmit power.
  • the driving head 20 of the image forming apparatus is the same with that the driving head of the image forming apparatus in the prior art.
  • FIG. 9 is a perspective view of a photosensitive drum driving head in the embodiment 1, not forming part of the claimed invention.
  • the photosensitive drum driving head comprises a drum flange 2, a drum shaft 3 and a boss 4, wherein the drum flange 2 is disposed on the end portion of a photosensitive drum 1, connected with the photosensitive drum 1 and used for transmitting the received power to the photosensitive drum 1; the drum shaft 3 is axially extended from the end portion of the drum flange 2 and used for rotationally supporting the photosensitive drum 1 during the operation of a process cartridge; the boss 4 is axially extended from the end face of the drum shaft 3 and used for receiving the power from the driving head 20 of the image forming apparatus; and a first convex teeth 5a radially extended along the boss 4 is formed on a side wall 4b of the boss 4. More specifically, the first convex tooth 5a is obliquely formed on the side wall 4b of the boss.
  • the first convex tooth 5a on the boss 4 of the photosensitive drum driving head is engaged with any power transmission portion 11a for power transmission.
  • the side wall 4b of the boss of the photosensitive drum driving head is tangential to and engaged with the retainer portions 11b of the recess of the driving head of the image forming apparatus at three tangential points P1, P2 and P3, so that the center alignment between the photosensitive drum driving head and the driving head 20 of the image forming apparatus during the power transmission can be achieved.
  • FIG. 10 is a force diagram illustrating the assembly of the photosensitive drum driving head and the driving head of the image forming apparatus.
  • A refers to the rotation direction of the driving head for the image forming apparatus;
  • F11 refers to the force applied to the first convex tooth 5a by the driving head of the image forming apparatus and is resolved into a normal force F12 and a radial force F14;
  • F15 refers to the force applied to the driving head for the image forming apparatus at the tangential point P1;
  • F13 refers to the force applied to the driving head for the image forming apparatus at the tangential point P2; and no force is applied at the tangential point P3.
  • the convex teeth, engaged with the power transmission portions, and a cylindrical surface of a boss, taken as a positioning portion, of the photosensitive drum driving head are disposed at different positions, so that the functions of power transmission and positioning cannot be affected by each other due to wear.
  • FIGS. 11 and 12 are respectively a perspective view and a front view of a photosensitive drum driving head in the embodiment not forming part of the claimed invention
  • FIG. 13 is a top view illustrating the assembly of the photosensitive drum driving head in the embodiment and a driving head of an image forming apparatus.
  • the driving head for the image forming apparatus in the embodiment adopts the driving head for the image forming apparatus in the embodiment 1 and will not be described further.
  • the photosensitive drum driving head comprises a drum flange 2, a drum shaft 3 and a cylindrical boss 4, wherein the drum flange 2 is fixedly connected to the end portion of a photosensitive drum 1; the drum shaft 3 is axially extended from the end portion of the drum flange 2 and used for rotationally supporting the photosensitive drum 1 during the operation of a process cartridge; the cylindrical boss 4 is axially extended from the end face of the drum shaft 3 and used for receiving power from the driving head 20 of the image forming apparatus; and a pair of convex teeth 4a, which are radially extended along the cylindrical boss 4 and engaged with any two power transmission portions in the driving head of the image forming apparatus, are formed on a side wall 4b of the cylindrical boss 4.
  • the convex teeth 4a are obliquely formed on the side wall 4b of the cylindrical boss 4.
  • the convex teeth 4a are provided with mating surfaces 4a1, and the area of the mating surfaces 4a1 is between 5 and 20 mm2 and preferably between 7 and 16 mm2.
  • the mating surfaces 4a1 are engaged with inner walls of the power transmission portions in the driving head of the image forming apparatus to transmit power.
  • the included angle ⁇ between the convex teeth 4a and a rotation axis of the photosensitive drum driving head is between 3 and 40 degrees and preferably between 25 and 30 degrees, so that smooth engagement between the photosensitive drum driving head and the driving head of the image forming apparatus can be guaranteed and meanwhile the phenomenon that the photosensitive drum driving head is disengaged from the driving head of the image forming apparatus during the power transmission can be prevented, and thus the stable power transmission between the driving head of the image forming apparatus and the photosensitive drum driving head can be achieved.
  • L1 refers to the length of the convex teeth 4a beginning from the side wall 4b along the radial direction and is between 2 and 5 mm and preferably between 2.3 and 3.3 mm, so that guarantee is made that the photosensitive drum driving head has sufficient moment for power transmission.
  • the minimum included angle ⁇ between the two convex teeth 4a has a standard angle of 120 degrees, and the upper limit angle tolerance is generally within 2 degrees.
  • the convex teeth 4a are allowed to have the manufacturing accuracy error ⁇ , which is between 2 and 10 degrees and preferably between 2 and 4 degrees. If ⁇ refers to angular error, the minimum included angle ⁇ between the two convex teeth 4a is converted into ⁇ + ⁇ .
  • the two convex teeth 4a may not be engaged with the power transmission portions 11a of the recess 11 at the same time, and the convex tooth disposed on the upmost upstream of the rotation direction is engaged with the power transmission portion on the driving head of the image forming apparatus first and has the function of buffering. If the convex teeth 4a have the manufacturing error of ⁇ along the downstream of the rotation direction, a graded mating surface may be formed on each convex tooth and has the function of buffering the convex tooth 4a during the engagement between the convex tooth 4a and the power transmission portion 11a of the recess, and hence the damage between the driving head of the image forming apparatus and the photosensitive drum driving head can be reduced.
  • a boss cylindrical surface between the two convex teeth 4a makes contact with the retainer portions 11b of the driving head of the image forming apparatus to achieve the positioning of the photosensitive drum driving head.
  • round angles are also formed at joints of the convex teeth 4a and the boss cylindrical surface to reduce stress concentration.
  • the drum flange 2, the drum shaft2, the cylindrical boss 4 and the convex teeth 4a of the photosensitive drum driving head may be integrally formed by the same material and may also have buffer structures, and the drum flange 2 may also be provided with a drum gear 2a used for transmitting the power to other elements (such as a developing element).
  • FIG. 14 is a schematic diagram illustrating the assembly of the photosensitive drum driving head and the driving head of the image forming apparatus
  • FIG. 15 is a force diagram illustrating the state after the engagement of the driving head of the image forming apparatus and the photosensitive drum driving head.
  • the photosensitive drum driving head is tangential to and engaged with the retainer portions 11b of the recess of the driving head for the image forming apparatus at three tangential points P4, P5 and P6.
  • A refers to the rotation direction of the driving head for the image forming apparatus; forces F24 and F56 which are the same with each other are applied to the photosensitive drum driving head by the driving head of the image forming apparatus; when the torsional moment born by the photosensitive drum driving head is twice that in the embodiment 1, F24 and F56 are the same with F11 in the embodiment 1; F24 is resolved into a normal force F2 and a radial force F4; F56 is resolved into a normal force F5 and a radial force F6; F2 and F5 are the same with F12 in the embodiment 1; and F4 and F6 are the same with F14 in the prior art.
  • the number of the force points of the proposal is reduced, so that the wear of the driving head of the image forming apparatus and the photosensitive drum driving head at the tangential points P5 and P6 can be reduced, and thus the positioning stability of the photosensitive drum driving head can be improved, and consequently more stable power transmission can be achieved.
  • the invention relates to a driving mechanism of the image forming apparatus, which comprises the photosensitive drum driving head in the embodiment and the driving head 20 for the image forming apparatus in the prior art.
  • the driving head 20 of the image forming apparatus comprises a recess 11, power transmission portions 11a and retainer portions 11b, wherein the recess 11 is provided with a equilateral triangle cross section; the power transmission portions 11a are arranged at three vertex angles of the triangle and have twisted structures; and the retainer portions 11b are disposed on three edges of the triangle.
  • the driving head of the image forming apparatus is connected with a motor in the image forming apparatus for power transmission.
  • FIG. 16 is a perspective view of a photosensitive drum driving head in the embodiment not forming part of the claimed invention.
  • the oblique tooth 4a is obliquely formed on a side wall 4b of a boss and the vertical tooth 4c is vertically formed on the side wall 4b.
  • both convex teeth of a photosensitive drum driving head may be configured to be vertical teeth.
  • 4d refers to the convex teeth of the photosensitive drum driving head.
  • the manufacturing accuracy of the photosensitive drum driving head is further reduced.
  • the convex teeth 4a in the embodiment are also provided with mating surfaces 4a1, and the area of the mating surfaces 4a1 is between 5 and 20 mm2 and preferably between 7 and 16 mm2.
  • the mating surfaces 4a1 are engaged with inner walls of power transmission portions in the driving head of the image forming apparatus to transmit power.
  • the wear between the photosensitive drum driving head and the driving head of the image forming apparatus can be reduced.
  • each convex tooth is also provided with a vertex angle 4a4 and two parallel planes 4a2 and 4a3 connected with a side wall of the convex tooth.
  • the included angle between the planes 4a2 and 4a3 and an axial line of a photosensitive drum is ⁇ .
  • the mating surfaces are also provided with straight edges s1 and s2 and bevel edges s3, wherein the straight edges s1 and s2 are parallel to each other; the included angle ⁇ between the bevel edges s3 and the axial line of the photosensitive drum is between 5 and 50 degrees and preferably between 10 and 40 degrees; and the included angle ⁇ between the straight edges s1 and connecting lines from the center of the photosensitive drum driving head to the vertex angles 4a4 of the convex teeth is between 0 and 90 degrees and preferably between 25 and 45 degrees.
  • the "B" direction as shown in FIG. 18 is parallel to the radial extension direction of a boss.
  • the convex teeth may also be configured to be three symmetrical convex teeth; the three convex teeth may be all configured to be oblique convex teeth, or all configured to be vertical convex teeth, or with one configured to be an oblique convex tooth and the other two configured to be vertical convex teeth, or with one configured to be a vertical convex tooth and the other two configured to be oblique convex teeth; and the same technical effect can be also achieved.
  • the oblique convex tooth refers to that the convex tooth is obliquely formed on the side wall of the boss
  • the vertical convex tooth refers to that the convex tooth is vertically formed on the side wall of the boss.
  • a driving head of an image forming apparatus in the embodiment not forming part of the claimed invention is the same with that in the above embodiment.
  • FIGS. 21 and 22 are respectively a perspective view and a top view of a photosensitive drum driving head in the embodiment.
  • the photosensitive drum driving head comprises a drum flange 200, a drum shaft 300, a cylindrical boss 400 and three vertical convex teeth 500, wherein the drum flange 200 is fixedly connected to the end portion of a photosensitive drum 1; the drum shaft 300 is axially extended from the end portion of the drum flange 200 and used for rotationally supporting the photosensitive drum 1 during the operation of a process cartridge; the cylindrical boss 400 is axially extended from the end face of the drum shaft 300 and used for receiving power from the driving head 20 of the image forming apparatus; the three vertical convex teeth 500, which are radially extended along the cylindrical boss 400 and engaged with the power transmission portions 11a of the driving head for the image forming apparatus, are formed on a side wall 400a of the cylindrical boss 400; the included angle between the vertical convex teeth 500 and an axial line of the photosensitive drum is 0 degree; and the extending length of the cylindrical
  • FIG. 23 is a top view illustrating the assembly of the photosensitive drum driving head and the driving head of the image forming apparatus
  • FIG. 24(a) is a right view illustrating the assembly of the photosensitive drum driving head and the driving head of the image forming apparatus
  • FIG. 24(b) is a sectional view of FIG. 24(a) along the C direction
  • FIGS. 25 and 26 are respectively a sectional view of FIG. 23 along the A direction and the B direction.
  • each vertical convex tooth 500 has a mating surface 500a, a first side face 500b1 and a second side face 500b2, wherein the first side face 500b1 and the second side face 500b2 are parallel to each other, perpendicular to the end face of the drum shaft 300 and parallel to the axial line of the photosensitive drum; the mating surface 500a is perpendicular to the end face of the drum shaft 300 and parallel to the axial line of the photosensitive drum; the chamfer angle ⁇ between the mating surface 500a and the first side face 500b1 is matched with the obliqueness of the twisted bevel 11a1 in the recess 11, so as to increase the contact area when the mating surface 500a is engaged with the twisted bevel 11a1 for power transmission.
  • the chamfer angle ⁇ is between 0 and 90 degrees and preferably between 20 and 45 degreed, as illustrated in FIGS. 21 and 22 .
  • the roots of the vertical convex teeth 500 are engaged with edges 11a3 (as illustrated in FIGS. 7 and 8 ) of the twisted bevels 11a1, namely one line on each mating surface 500a is engaged with the edge 11a3 (as illustrated in FIGS. 7 and 8 ) for power transmission.
  • the area of the mating surfaces 500a is between 2 and 20 mm2 and preferably between 3 and 10 mm2, as illustrated in FIGS. 23 and 26 .
  • the boss 400 is configured to be conical, namely the outside diameter d1 of a cross-section circle on the end portion of the boss is less than the outside diameter d2 of a cross-section circle at the tail of the boss, as illustrated in FIG. 25 .
  • the boss 400 is configured to be conical, namely the outside diameter d1 of a cross-section circle on the end portion of the boss is less than the outside diameter d2 of a cross-section circle at the tail of the boss, as illustrated in FIG. 25 .
  • FIG. 26 as the internal structure of the driving head 20 of the image forming apparatus is twisted along a specified direction and the twisted bevels 11a1 and the guide bevels 11a2 (as illustrated in FIGS.
  • the width W of the convex teeth 500 interposed into the recess is inversely proportional to the height L of the convex teeth 500, i.e., the greater the width, the smaller the height; the width W of the convex teeth 500 is directionally proportional to the intensity of the convex teeth 500, i.e., the greater the width, the higher the intensity, the smaller the height, and the convex teeth can be more easily disengaged from the recess.
  • the height L is between 1.0 and 8.0 mm and preferably between 2.0 and 4.0 mm
  • the width W is between 1.0 and 5.0 mm and preferably between 1.5 and 4.0 mm, so that not only the intensity requirement during the power transmission is met but also a guarantee is made that the convex teeth 500 be not easily disengaged from the recess.
  • the axial positioning between the photosensitive drum driving head and the driving head for the image forming apparatus may be via the contact between the end face of the boss 400 and the bottom surface of the recess 11, and may also be via the contact between end faces of the convex teeth 500 and the guide bevels 11a2 in the recess 11 (as illustrated in FIGS. 7 and 8 ).
  • FIG. 27 is a partial structural perspective view of the photosensitive drum driving head adopting the end faces of the convex teeth for positioning. As shown in the figure, the extending length of the cylindrical boss 400 along the axial direction of the photosensitive drum is less than the extending length of the vertical convex teeth 500 along the axial direction of the photosensitive drum.
  • the mating surfaces are formed by longitudinal cutting angles on the end faces of the vertical convex teeth, and the longitudinal direction of the vertical convex teeth is parallel to the axial direction of the photosensitive drum.
  • the roots of the vertical convex teeth are the parts of the vertical convex teeth connected with the end portion of the drum shaft.
  • FIG. 28 is a perspective view of a photosensitive drum driving head in the embodiment
  • FIG. 29 is a right view of FIG. 28 .
  • the differences between the photosensitive drum driving head in the embodiment and the photosensitive drum driving head in the embodiment 5 are as follows: a second side face 500b2 of each vertical convex tooth is configured to a graded bevel gradually varied towards the root of the vertical convex tooth along an end portion 500b3 of the vertical convex tooth, and other structures are consistent; and the included angle ⁇ between the second side face 500b2 and a first side face 500b1 is between 3 and 45 degrees and preferably between 20 and 30 degrees.
  • the photosensitive drum driving head has the technical problems that: the greater the width W, the higher the intensity of the convex teeth, the smaller the width L, and the convex teeth are more easily to be disengaged from the recess; and in reverse, the smaller the width W, the lower the intensity of the convex teeth, the greater the height L, and the convex teeth are more uneasily to be disengaged from the recess.
  • the second side face 500b2 is a graded bevel gradually varied towards the root of each vertical convex tooth along the end portion of the vertical convex tooth, namely the width of the end portion of the vertical convex tooth 500 is less than the width of the root
  • the height of the vertical convex tooth interposed into the recess 11 can be increased by the reduction of the width of the end portion of the vertical convex tooth 500, and hence the convex tooth cannot be easily disengaged from the recess
  • the intensity of the root can be increased by the increase of the width of the root, so that not only the condition of the height of the vertical convex tooth interposed into the recess can be satisfied but also the intensity of the root of the vertical convex tooth can be increased.
  • the axial positioning between the photosensitive drum driving head and the driving head for the image forming apparatus may be via the contact between the end face of a boss 400 and the bottom surface of the recess 11 and may also be via the contact between end portions 500b3 of the vertical convex teeth 500 and the bottom surface of the recess 11 (as illustrated in FIGS. 7 and 8 ), as illustrated in FIG. 30 which is a partial structural perspective view of the photosensitive drum driving head adopting the end faces of the convex teeth for positioning.
  • the extending length of the cylindrical boss 400 along the axial direction of a photosensitive drum is less than the extending length of the vertical convex teeth 500 along the axial direction of the photosensitive drum.
  • FIG. 31 is a schematic diagram illustrating the state when the vertical convex teeth are connected with each other through a cambered surface.
  • the end face of the boss 400 among the vertical convex teeth 500 is a cambered surface which is recessed towards the drum shaft, namely the three vertical convex teeth 500 are connected with each other through the cambered surface. Therefore, the stress concentration at joints of the boss and the vertical convex teeth can be reduced, and thus the phenomenon of fracture at the joints of the boss and the vertical convex teeth when the force is applied to the vertical convex teeth can be prevented.
  • FIGS. 32 and 33 are respectively a partial structural perspective view of the photosensitive drum driving head with non-run portions and a sectional view illustrating the internal structure after the engagement between the photosensitive drum driving head with the non-run portions and the driving head for the image forming apparatus.
  • the non-run portions 500a2 are formed on mating surfaces 500a adjacent to the end faces of the vertical convex teeth. As shown in the figure, the non-run portions 500a2 are perpendicular to the mating surfaces 500a and extend outwards and are configured to be cambered or semispherical bodies extending outwards from the top of the mating surfaces 500a.
  • the non-run portions 500a2 When the photosensitive drum driving head is engaged with the driving head for the image forming apparatus to transmit power, the non-run portions 500a2 may be engaged with the twisted bevels 11a1 in the recess 11. If the photosensitive drum driving head tends to the disengaged along the axial direction, the non-run portions 500a2 may abut against the twisted bevels 11a1 in the recess 11, so that the tension in the axial direction can be produced between the photosensitive drum driving head and the driving head for the image forming apparatus to prevent the photosensitive drum driving head from being disengaged from the driving head for the image forming apparatus.

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  • General Physics & Mathematics (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)

Claims (10)

  1. Lichtempfindlicher Trommelantriebskopf einer Prozesskartusche für eine Bildgebungsvorrichtung, wobei die Prozesskartusche herausnehmbar in der Bildgebungsvorrichtung montiert ist, der lichtempfindliche Trommelantriebskopf umfassend:
    einen Trommelflansch (2), angeordnet am Endabschnitt einer lichtempfindlichen Trommel (1) und verbunden mit der lichtempfindlichen Trommel (1);
    eine Trommelwelle (3), axial verlaufend vom Endabschnitt des Trommelflansches (2); und
    eine Lagernabe (4), axial verlaufend von der Endfläche der Trommelwelle (3) und angeordnet zum Eingreifen mit einer verdrehten Aussparung (11) eines Antriebskopfes (20) der Bildgebungsvorrichtung,
    wobei
    mindestens ein konvexer Zahn (5a), radial verlaufend entlang der Lagernabe (4) und angeordnet zum Eingreifen mit einem Kraftübertragungsabschnitt (11a) des Antriebskopfes (20) der Bildgebungsvorrichtung, an der Seitenwand der Lagernabe (4) gebildet ist;
    der konvexe Zahn (5a) versehen ist mit einer ersten Seitenfläche (500b1) und einer zweiten Seitenfläche (500b2) in Form einer graduierten Schräge, die zur Wurzel des konvexen Zahns (5a) entlang des Endabschnitts des konvexen Zahns (5a) allmählich variiert;
    der konvexe Zahn (5a) versehen ist mit einer passenden Oberfläche (500a) parallel zu einer axialen Linie der lichtempfindlichen Trommel (1), wobei die passende Oberfläche (500a) angeordnet ist, mit einer Kante einer verdrehten Schräge (11a1) in die Aussparung (11) des Antriebskopfes (20) der Bildgebungsvorrichtung einzugreifen, um Kraft zu übertragen.
  2. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1, wobei der Kraftübertragungsabschnitt (11a) auch mit einer Führungsschräge (11a2) versehen ist; und wenn der lichtempfindliche Trommelantriebskopf im Eingriff mit dem Kraftübertragungsabschnitt (11a) zur Kraftübertragung ist, dann ist die erste Seitenfläche (500b1) gegenüber einer Kante der verdrehten Schräge (11a1) und ist die zweite Seitenfläche (500b) gegenüber der Führungsschräge (11a2) an der verdrehten Schräge (11a1).
  3. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1, wobei die Anzahl der konvexen Zähne (5a) zwei oder mehr ist.
  4. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1 oder 2, wobei die konvexen Zähne (5a) konfiguriert sind, um nur vertikale konvexe Zähne, von denen die ersten Seitenflächen (500b1) senkrecht zu der Endfläche der Trommelwelle (3) sind, oder nur schräge Zähne, schräg geformt an der Seitenwand der zylindrischen Lagernabe (4), oder die Kombination aus vertikalen Zähnen (vertikaler Zahn) und schrägen Zähnen (schräger Zahn) zu sein.
  5. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1, wobei die Breite des Endabschnitts des konvexen Zahns (5a) weniger ist als die der Wurzel des konvexen Zahns (5a).
  6. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1 oder 5, wobei die Wurzel des konvexen Zahns (5a) angeordnet ist zum Eingreifen mit der Kante der verdrehten Schräge (11a1) in der Vertiefung (11) des Antriebskopfes (20) der Bildgebungsvorrichtung, um Kraft zu übertragen.
  7. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1, wobei ein nicht laufender Abschnitt auf der passenden Oberfläche (500a) neben der Endfläche des konvexen Zahns (5a) angeordnet ist, senkrecht zu der passenden Oberfläche (500a) ist und nach außen verläuft und von gekrümmter oder halbkugelförmiger Form ist.
  8. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1, wobei der Öffnungswinkel zwischen der ersten Seitenfläche (500b1) und der zweiten Seitenfläche (500b2) zwischen 20 und 30 Grad ist.
  9. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1, wobei die Endfläche der Lagernabe (4) des lichtempfindlichen Trommelantriebskopfes angeordnet ist, um mit der unteren Oberfläche der Vertiefung (11) in dem Antriebskopf (20) der Bildgebungsvorrichtung in Berührung zu treten.
  10. Lichtempfindlicher Trommelantriebskopf nach Anspruch 1, wobei die Endfläche des konvexen Zahns (5a) für den lichtempfindlichen Trommelantriebskopf angeordnet ist, um mit der unteren Oberfläche der Vertiefung (11) in dem Antriebskopf (20) der Bildgebungsvorrichtung in Berührung zu treten.
EP12868927.0A 2012-07-05 2012-12-13 Lichtempfindlicher trommelantriebskopf und antriebsmechanismus für eine bildgebungsvorrichtung Not-in-force EP2703893B1 (de)

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CN201210232590.1A CN102866609B (zh) 2011-07-05 2012-07-05 一种感光鼓驱动头及图像形成装置驱动机构
PCT/CN2012/086505 WO2014005403A1 (zh) 2012-07-05 2012-12-13 一种感光鼓驱动头及图像形成装置驱动机构

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JP6504449B2 (ja) * 2014-08-27 2019-04-24 株式会社リコー 駆動伝達装置及び画像形成装置
JP2019211076A (ja) * 2018-05-30 2019-12-12 キヤノン株式会社 駆動伝達装置及び画像形成装置

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CN202394037U (zh) * 2011-11-11 2012-08-22 江西亿铂电子科技有限公司 感光鼓及处理盒

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JP5935023B2 (ja) 2016-06-15
AU2012382294B2 (en) 2015-05-07
RU2015103674A (ru) 2016-08-27
RU2599597C9 (ru) 2017-02-20
CA2839969A1 (en) 2014-01-09
EP2703893A4 (de) 2014-12-03
EP2703893A1 (de) 2014-03-05
CA2839969C (en) 2017-11-07
WO2014005403A1 (zh) 2014-01-09
AU2012382294A1 (en) 2014-01-23
RU2599597C2 (ru) 2016-10-10

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