WO2014005403A1 - 一种感光鼓驱动头及图像形成装置驱动机构 - Google Patents

一种感光鼓驱动头及图像形成装置驱动机构 Download PDF

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Publication number
WO2014005403A1
WO2014005403A1 PCT/CN2012/086505 CN2012086505W WO2014005403A1 WO 2014005403 A1 WO2014005403 A1 WO 2014005403A1 CN 2012086505 W CN2012086505 W CN 2012086505W WO 2014005403 A1 WO2014005403 A1 WO 2014005403A1
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WO
WIPO (PCT)
Prior art keywords
photosensitive drum
driving head
image forming
straight
boss
Prior art date
Application number
PCT/CN2012/086505
Other languages
English (en)
French (fr)
Inventor
吴俊中
彭庆菲
曹建新
刘金莲
Original Assignee
珠海赛纳打印科技股份有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN201210232590.1A external-priority patent/CN102866609B/zh
Application filed by 珠海赛纳打印科技股份有限公司 filed Critical 珠海赛纳打印科技股份有限公司
Priority to AU2012382294A priority Critical patent/AU2012382294B2/en
Priority to RU2015103674A priority patent/RU2599597C9/ru
Priority to EP12868927.0A priority patent/EP2703893B1/en
Priority to CA2839969A priority patent/CA2839969C/en
Priority to JP2015518787A priority patent/JP5935023B2/ja
Priority to US13/972,739 priority patent/US8886087B2/en
Publication of WO2014005403A1 publication Critical patent/WO2014005403A1/zh

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a photosensitive drum driving head and an image forming apparatus driving mechanism. Background technique
  • a conventional image forming apparatus is provided with a motor, an image forming apparatus driving head, and a process cartridge, and the process cartridge is detachably mounted in the image forming apparatus, and the process cartridge is provided with a photosensitive drum and a photosensitive drum drive fixedly coupled to the end of the photosensitive drum
  • the head generates a power during the operation of the image forming apparatus, and transmits power to the process cartridge through the image forming apparatus driving head and the photosensitive drum driving head to rotate the photosensitive drum on the process cartridge.
  • one end of the photosensitive drum 7 is fixedly provided with a photosensitive drum driving head, and the photosensitive drum driving head includes a convex connecting shaft 17, and the convex connecting shaft 17 is provided with a twist-shaped boss 17a, which is convex.
  • the stage 17a includes a tip end portion 17a1; the center of rotation of the male coupling shaft 17 coincides with the center of rotation of the photosensitive drum 7; the concave connecting shaft 18 includes a twisted groove 18a on which the bottom surface 18a1 is provided.
  • the image forming apparatus drive head 18 receives power rotation from the motor, the male coupling shaft 17 is engaged with the image forming apparatus drive head 18, and the rotational power is transmitted to the male coupling shaft through the image forming apparatus drive head 18. 17, and finally the photosensitive drum 7 is rotated.
  • the male coupling shaft 17 is engaged with the image forming apparatus driving head 18, the twisted projection 17a on the male coupling shaft 17 is inserted into the twisted groove on the image forming apparatus driving head 18.
  • the end surface 17a1 is opposed to the bottom surface 18a2, and the rotational power on the image forming apparatus drive head 18 is transmitted to the male coupling shaft 17 by the engagement of the twist boss 17a with the recess 18a.
  • FIG. 3 and 4 are schematic cross-sectional views showing the state in which the twisted projection 17a and the twisted recess 18a are not rotated and rotated, respectively.
  • the cross section of the twisted projection 17a and the twisted recess 18a are both triangular. (e.g., an equilateral triangle), and the size of the triangular boss 17a is smaller than the size of the triangular groove 18a.
  • the convex connecting shaft rotating shaft XI on the photosensitive drum does not coincide with the rotating shaft X2 of the image forming apparatus driving head.
  • Fig. 3 when the boss 17a is inserted into the recess 18a but does not rotate with the recess 18a, the convex connecting shaft rotating shaft XI on the photosensitive drum does not coincide with the rotating shaft X2 of the image forming apparatus driving head.
  • Fig. 3 when the boss 17a is inserted into the recess 18a but does not rotate with the recess 18a, the convex connecting shaft rotating shaft
  • R0 is the diameter of the rotating circle of the three apex angles 17a2 of the boss 17a
  • R1 is the diameter of the inscribed circle of the triangular groove 18a
  • R2 is the diameter of the three apex angles of the groove 18a
  • FIG. 5 Another embodiment of the prior art is shown in FIG. 5.
  • the twisted projection 17a and the twisted recess 18a are both quadrangular (such as a regular quadrilateral), and the quadrilateral projection 17a is engaged with the quadrangular recess 18a. And pass the power.
  • the image forming apparatus driving head can also adopt the manner shown in FIG. 6.
  • one end of the image forming apparatus driving head 28 is provided with a twisted groove 28a, and the groove 28a is provided with a bottom surface 28al and
  • the boss 28a2 is located at the center of the twisted triangular groove 28a (the center of rotation of the boss coincides with the rotation axis X2 of the image forming apparatus driving head), Its height is substantially the same as the depth of the groove 28a, which may be tapered.
  • a photosensitive drum with a photosensitive drum driving head is generally used on a processing cartridge used in a conventional image forming apparatus, and the processing cartridge includes at least: a photosensitive drum driving head for forming an electrostatic latent image a photosensitive drum, a developer that develops the electrostatic latent image, and a developing roller that conveys the developer to the photosensitive drum.
  • the image forming apparatus drive head receives rotational power from the motor from the image forming apparatus to rotate the photosensitive drum and the developing roller.
  • the distortion angle of the twisted surface on the boss and the groove is required to be high.
  • the twisted surface on the boss and the twisted surface on the groove are inconsistent due to manufacturing precision problems, the twisted surface on the boss and the twisted surface on the groove are in point-to-surface contact, one of which is twisted Deformation occurs during the engagement of the boss and the groove, so that the convex connecting shaft rotation axis XI on the photosensitive drum does not coincide with the rotation axis X2 of the image forming apparatus driving head, which affects the smoothness of power transmission;
  • the above problem requires that the twisted surface of the boss and the groove is highly manufactured, which increases the manufacturing cost and causes problems in manufacturing and the like.
  • the polygonal shape of the boss and the groove is difficult to process, and the manufacturing precision of the boss and the groove is required to be high. Taking an equilateral triangle as an example, the accuracy of the equilateral triangular boss and the groove is high, so as to ensure the accuracy of the center position of the triangle. Otherwise, the convex connecting shaft rotation axis XI on the photosensitive drum when the boss and the groove are engaged The rotation axis X2 of the driving head of the image forming apparatus may not overlap, thereby causing the transmission to be unstable. In addition, during the engagement of the boss and the groove, the apex angle of the triangle on the boss is easy to transmit due to the apex angle of the triangle.
  • the present invention provides a photosensitive drum driving head and an image forming apparatus driving mechanism for solving the technical problem that the conventional photosensitive drum driving head has high requirements for the distortion angle accuracy of the twisted projection and the twisted concave engagement.
  • the technical solution adopted by the present invention is:
  • a photosensitive drum driving head that transmits a driving force in cooperation with an image forming apparatus driving head, the image forming apparatus driving head comprising: a twisted groove having a triangular cross section, and three apex angles disposed at the twisted groove
  • the power transmission portion, the power transmission portion includes a twisted slope, and the top of the twisted slope includes an edge that engages with the photosensitive drum drive head
  • the photosensitive drum drive head includes: disposed at the end of the photosensitive drum a drum flange connected to the photosensitive drum, a drum shaft extending axially from the end of the drum flange, a boss projecting axially from the end surface of the drum shaft and engaging with a groove on the driving head of the image forming apparatus
  • the side wall of the boss is provided with three straight convex teeth extending in the radial direction of the boss and matching the power transmission portion, the straight convex teeth being perpendicular to the drum shaft and extending in the direction of the drum axis Extendingly, the straight
  • the straight protruding tooth further includes: a first side surface and a second side surface; the first side surface of the drum shaft is perpendicular, the second side surface is inclined, and the width of the straight convex teeth is along the straight convex The ends of the teeth gradually increase toward the root of the straight teeth.
  • the photosensitive drum driving head is arranged as a straight tooth of the power transmission portion, which solves the requirement that the existing photosensitive drum driving head has high distortion angle precision due to the twisted convex bracket and the twisted concave concave fit. technical problem.
  • FIG. 1 is a perspective view of a photosensitive drum with a photosensitive drum driving head in the prior art.
  • FIG. 2 is a perspective view of a prior art male coupling shaft and a female coupling shaft.
  • Fig. 3 is a schematic view showing a state of a cross section when the prior art twisted projection and the twisted recess are not rotated.
  • FIG. 4 is a schematic view showing a state of a cross section of a prior art twisted protrusion and a twisted groove.
  • Fig. 5 shows another shape of the protrusion and the groove of the prior art in the shape of a quadrangle.
  • Fig. 6 is a schematic view showing a center of a groove in the prior art in which a boss is provided.
  • Fig. 7 is a perspective view showing the driving head of the image forming apparatus.
  • Figure 8 is a plan view of the image forming apparatus drive head.
  • Fig. 9 is a perspective view showing the photosensitive drum driving head used in the first embodiment.
  • Fig. 10 is a view showing the force analysis of the assembly of the photosensitive drum driving head and the image forming apparatus driving head used in the first embodiment.
  • Figure 11 is a perspective view of the photosensitive drum driving head used in the second embodiment.
  • Figure 12 is a front elevational view of the photosensitive drum driving head used in the second embodiment.
  • Fig. 13 is a plan view showing the assembly of the photosensitive drum driving head and the image forming apparatus driving head used in the second embodiment.
  • Fig. 14 is a view showing the assembly of the photosensitive drum driving head and the image forming apparatus driving head used in the second embodiment.
  • Fig. 15 is a cross-sectional view showing the force analysis of the driving head of the image forming apparatus used in the second embodiment after being engaged with the photosensitive drum driving head.
  • Figure 16 is a perspective view showing the photosensitive drum driving head used in the third embodiment.
  • Figure 17 is a perspective view showing the photosensitive drum driving head used in the fourth embodiment.
  • Figure 18 is a partial enlarged view of the boss used in the present invention.
  • Figure 19 is a front elevational view of Figure 18 taken along line B.
  • Figure 20 is a plan view of the boss used in the present invention.
  • Figure 21 is a perspective view showing the photosensitive drum driving head used in the fifth embodiment.
  • Figure 22 is a plan view showing the photosensitive drum driving head used in the fifth embodiment.
  • Fig. 23 is a plan view showing the assembly of the photosensitive drum driving head and the image forming apparatus driving head used in the fifth embodiment.
  • Fig. 24 (a) is a right side view showing the assembly of the photosensitive drum driving head and the image forming apparatus driving head employed in the fifth embodiment.
  • Figure 24 (b) is a cross-sectional view along line C in Figure 24 (a).
  • Figure 25 is a cross-sectional view taken along line A of Figure 23;
  • Figure 26 is a cross-sectional view taken along line B of Figure 23;
  • Fig. 27 is a perspective view showing the structure of a portion of the photosensitive drum driving head in which the convex tooth end face is positioned in the fifth embodiment.
  • Figure 28 is a perspective view showing the photosensitive drum driving head used in the sixth embodiment.
  • Figure 29 is a right side view of Figure 28.
  • Fig. 30 is a perspective view showing the structure of a portion of the photosensitive drum driving head in which the convex tooth end face is positioned in the sixth embodiment.
  • Figure 31 is a schematic view showing the arcuate connection between the straight and convex teeth in the sixth embodiment.
  • Figure 32 is a perspective view showing the structure of a portion of a photosensitive drum driving head provided with a retaining portion in the sixth embodiment.
  • Fig. 33 is a view showing the internal structure of the photosensitive drum driving head provided with the retaining portion in the sixth embodiment after being engaged with the image forming apparatus driving head. detailed description
  • FIG. 7 and FIG. 8 are respectively a perspective view and a top view of a driving head of an image forming apparatus.
  • the image forming apparatus driving head 20 includes: a groove 11 having an equilateral triangle cross section, which is disposed at three apex angles of a triangle and The power transmission portion 11a having a twisted structure and the stopper portion lib located at three sides of the triangle; the power transmission portion 11a includes a twisted slope 11la and a lead slope 11a2. It can be seen from the top view shown in FIG.
  • the image forming apparatus drive head is coupled to a motor in the image forming apparatus to transmit power.
  • the image forming apparatus drive head 20 is identical to the prior art image forming apparatus drive head.
  • Figure 9 is a perspective view of the photosensitive drum driving head used in the first embodiment. As shown, the photosensitive drum driving head comprises: a drum flange 2 disposed at the end of the photosensitive drum 1 and connected to the photosensitive drum 1, and the drum flange 2 is used.
  • a drum shaft 3 extending axially from the end of the drum flange 2, the drum shaft 3 is for rotatably supporting the photosensitive drum 1 during operation of the process cartridge, from the drum shaft 3 axially extending, a boss 4 for receiving a driving force from the image forming apparatus driving head 20, the side wall 4b of the boss 4 is provided with a first protruding tooth 5a extending radially along the boss 4, wherein The first convex teeth 5a are obliquely disposed on the boss side wall 4b.
  • the first protruding teeth 5a located on the drum driving head boss 4 mesh with any power transmitting portion 11a to transmit power, and the boss side wall 4b of the photosensitive drum driving head and the image forming device drive the head concave
  • the stopper portion l ib of the groove is tangentially engaged at the three tangent points P1, P2 and P3, thereby achieving center-alignment centering between the photosensitive drum driving head and the image forming apparatus driving head 20 during the driving force transmission.
  • Figure 10 is a schematic view showing the force analysis of the driving of the photosensitive drum driving head and the image forming apparatus driving head, "A" is the rotation direction of the driving head of the image forming apparatus, and the force generated by the driving head of the image forming apparatus on the first convex teeth 5a is Fl l F11 is decomposed into normal force F12 and radial force F14, F15 is the force generated by the image forming device driving head at the cutting point P1, and F13 is the force generated by the image forming device driving head at the cutting point P2, and P3 is not Force, in summary, can be obtained as follows:
  • the 3 heads are subjected to a force of F12 at P1 and a force of 2 ⁇ F14 at P2.
  • FIG. 11 and FIG. 12 are respectively a perspective view and a front view of the photosensitive drum driving head used in the embodiment, and FIG. 13 is a top view of the driving drum driving head and the image forming apparatus driving head used in the embodiment.
  • the image forming apparatus driving head described in the embodiment employs the image forming apparatus driving head mentioned in the first embodiment, and the description thereof will not be repeated.
  • the photosensitive drum driving head comprises: a drum flange 2 fixedly connected to the end of the photosensitive drum 1, extending axially from the end of the drum flange 2, for rotatably supporting the photosensitive drum during the operation of the process cartridge a drum shaft 3 extending axially from the end surface of the drum shaft 3 for receiving a driving force from the image forming apparatus driving head 20, and a side wall 4b of the cylindrical boss 4 is provided along the cylinder a pair of convex teeth 4a extending radially and engaging with any two power transmission portions of the image forming apparatus driving head; the convex teeth 4a are obliquely disposed on the side wall 4b of the cylindrical boss 4, the convex teeth 4a
  • the engaging surface 4al is disposed on the surface of the engaging surface 4al, and the area of the engaging surface 4al is between 5 and 20 mm 2 , preferably 7 to 16 mm 2 .
  • the engaging surface 4 a1 When the force is transmitted, the engaging surface 4 a1 is engaged with the inner wall of the power transmitting portion 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 by providing the engaging surface 4al on the convex tooth 4a; the angle ⁇ between the convex tooth 4a and the rotational axis of the photosensitive drum driving head is selected as 3- Between 40°, 25-30° is the best to ensure the drum drive head and image shape
  • the device driving head can be smoothly engaged while preventing the photosensitive drum driving head from coming out of the image forming apparatus driving head during power transmission, so that the image forming apparatus driving head and the photosensitive drum driving head stably transmit power; the convex teeth 4a
  • the length from the side wall 4b in the radial direction is L1, and the range of L1 is 2-5 mm.
  • the minimum angle ⁇ between the two convex teeth 4a is 120 °, the upper limit of the angle is generally 2 °
  • the convex tooth 4a can allow the manufacturing precision error of the ⁇ size, the range of ⁇ is between 2 ° -10 °, and the optimum is 2-4 °. If the ⁇ is the angular error, the two convex teeth 4a The minimum angle ⁇ between the two becomes ⁇ + ⁇ , at which time the two convex teeth 4a do not simultaneously mesh with the power transmission portion Ha of the groove 11, and the convex teeth located most upstream in the rotational direction are first driven on the image forming apparatus.
  • the power transmission portion is engaged to serve as a buffering function. If the convex tooth 4a has a manufacturing error dimension of a corner size downstream of the rotation direction, the ⁇ will cause the convex tooth to produce a gradual meshing surface, and the power transmission in the convex tooth 4a and the groove
  • the portion 11a serves as a buffer for the convex teeth 4a during the meshing process, and can reduce damage between the driving head of the image forming apparatus and the driving head of the photosensitive drum; the cylindrical surface of the boss between the two protruding teeth 4a and the driving head of the image forming apparatus
  • the limiting portion l ib contacts the photosensitive drum driving head .
  • a rounded corner is also provided at the junction of the convex tooth 4a and the boss cylindrical surface to reduce stress concentration.
  • the drum flange 3, the drum shaft 3, the cylindrical boss 4 and the protruding teeth 4a in the above-mentioned photosensitive drum driving head may be integrally formed of the same material, or may have a buffer structure, and the drum flange 2 may be further provided with The drum gear 2a that transmits the driving force to other components such as the developing member or the like.
  • FIG. 14 is a schematic view showing the assembly of the driving head of the photosensitive drum and the driving head of the image forming apparatus
  • FIG. 15 is a schematic view showing the force analysis of the driving force of the driving head of the image forming apparatus after being engaged with the driving head of the photosensitive drum, and the photosensitive drum driving head and the image forming apparatus are known from the drawings.
  • the limiting portion l ib of the driving head groove is tangentially meshed at three cutting points P4, P5 and P6, "A" is the rotation direction of the driving head of the image forming apparatus, and the image forming device driving head generates a size for the photosensitive drum driving head
  • F24 and F56 are the same magnitude as the F11 in the first embodiment
  • F24 is decomposed into the normal force F2
  • the radial forces F4, F56 are decomposed into normal force F5 and radial force F6, F2 and F5 are the same size as F12 in the first embodiment, F4 and F6 is the same size as F14 in the prior art, assuming that F1 is the force generated by the image forming apparatus driving head at the point of cut P5, and F3 is the force generated by the image forming apparatus driving head at the point of cut P6, P4 is not subjected to force,
  • the driving head of the device and the driving head of the photosensitive drum are subjected to a force of 2 - F4 at P5, and the force at 0 is 0.
  • the force point is reduced, and the driving head and the photosensitive drum of the image forming apparatus are lowered.
  • the wear of the driving head at the cutting points P5 and P6 improves the positioning stability of the photosensitive drum driving head, thereby making the transmission of the driving force smoother.
  • An image forming apparatus driving mechanism comprising the photosensitive drum driving head described in the above embodiment and the image forming apparatus driving head 20 described in the background art, that is, the image forming apparatus driving head 20 includes: a concave having an equilateral triangle cross section The groove 11, the power transmission portion 11a which is disposed at three apex angles of the triangle and has a twisted structure, and the stopper portion 11b located at the three sides of the triangle.
  • the image forming device drive head is coupled to a motor in the image forming device to transmit power.
  • FIG. 16 is a photosensitive drum drive used in the embodiment.
  • a perspective view of the head is shown in the figure, the helical teeth 4a are obliquely disposed on the side wall 4b of the boss, and the straight teeth 4c are vertically disposed on the side wall 4b.
  • FIG. 17 is a perspective view of the photosensitive drum driving head used in the embodiment, 4c is a convex tooth of the photosensitive drum driving head, and the photosensitive drum driving head The manufacturing precision is further reduced.
  • the above-described embodiment is provided on the teeth 4a of the engagement surface there 4Al, 4Al engaging surface area is between 5-20mm 2, to the best 7-16mm 2, with the engagement surface 4Al force transmitting images
  • the inner wall of the power transmission portion of the device driving head is engaged to transmit power, and the wear between the photosensitive drum driving head and the driving head of the image forming apparatus can be reduced by providing the engaging surface 4a1 on the convex tooth 4a;
  • the protruding tooth further includes: a top corner 4a4, two mutually parallel planes 4a2 and 4a3 connected to the side wall of the convex tooth, and an angle between the planes 4a2 and 4a3 and the axis of the photosensitive drum is ⁇ ;
  • the mating surface further comprises: a straight edge sl, S2 and oblique side s3; the straight side si and the straight side s2 are parallel, and the angle ⁇ between the oblique side s3 and the axis of the photosensitive drum is between
  • the convex teeth can also be arranged in three symmetrical shapes, either of which are provided as inclined convex teeth or as convex teeth each being arranged vertically. , or one of them is set as a slanted convex tooth, the other two are set as vertical convex teeth, or one of them is set as a vertical convex tooth, and the other two are arranged as inclined convex teeth; the same technical effect can also be achieved.
  • the inclined convex teeth mean that the convex teeth are obliquely disposed on the side wall of the boss, and the vertical convex teeth mean that the protruding teeth are vertically disposed on the side wall of the boss.
  • the image forming apparatus driving head employed in this embodiment is the same as that in the above embodiment.
  • the photosensitive drum driving head includes: a drum flange 200 fixedly coupled to an end portion of the photosensitive drum 1, from the end of the drum flange 200
  • a drum shaft 300 extending axially for rotatably supporting the photosensitive drum 1 during operation of the process cartridge, a cylinder extending axially from the end surface of the drum shaft 300 for receiving a driving force from the image forming apparatus driving head 20 a convex boss 400, the side wall 400a of the cylindrical boss 400 is provided with three straight convex teeth 500 extending radially along the cylindrical boss 400 and cooperating with the power transmission portion 1 la of the image forming apparatus driving head.
  • the angle between the straight teeth 500 and the axis of the photosensitive drum is 0 degree, and the length of the cylindrical boss 400 extending in the axial direction of the photosensitive drum is greater than the length of the straight protruding teeth 500 extending in the axial direction of the photosensitive drum.
  • Figure 23 is a plan view showing the assembly of the photosensitive drum driving head and the image forming apparatus driving head
  • Figure 24 (a) is a right side view of the photosensitive drum driving head and the image forming apparatus driving head assembly
  • Figure 24 (b) is Figure 24
  • the straight protruding tooth 500 includes: an engaging surface 500a, a first side surface 500b1 and a second side surface 500b2; the first side surface 500b1 and the second side surface 500b2 are parallel to each other and perpendicular to the end surface of the drum shaft 300, and the photosensitive drum
  • the axes are parallel; the mating surface 500a is perpendicular to the end surface of the drum shaft 300 and parallel to the drum axis, the chamfer angle ⁇ between the mating surface 500a and the first side 500bl and the twisted slope l lal in the recess 11
  • Fig. 7-8 The inclination is matched to increase the contact area when the meshing surface 500a and the twisted bevel l lal mesh with each other to transmit power.
  • the bevel angle Y is between 0 and 90°, and the optimum is 20-45 °.
  • Figure 21-22 When the straight convex tooth 500 meshes with the image forming apparatus driving head 20 to transmit power, the root of the straight convex tooth 500 meshes with the edge l la3 (Fig. 7_8) of the twisted inclined surface l lal, that is, a line and an edge on the engaging surface 500a La3 (Fig.
  • the boss 400 is tapered, that is, the outer diameter dl of the cross-section of the end of the boss is smaller than the outer diameter d2 of the cross-section of the root of the boss, as shown in FIG.
  • the twisted slope l lal and the lead inclined surface l la2 (Fig. 7_8) in the groove 11 are inclined, so the convex tooth 500 is inserted into the concave shape.
  • the width W in the groove is inversely proportional to the height L, that is, the larger the width, the smaller the height;
  • the width W of the convex tooth 500 is proportional to its strength, that is, the larger the width, the stronger the strength, the smaller the height, the convex tooth The easier it is to escape from the groove;
  • the range of height L is
  • the range of width W is 1. 0-5. 0mm, with 1. 5-4. 0mm is the best, to achieve both delivery
  • the strength requirement during powering ensures that the protruding teeth 500 are not easily removed from the groove.
  • the axial positioning of the photosensitive drum driving head and the image forming apparatus driving head may be such that the end surface of the boss 400 contacts the bottom surface of the groove 11 for axial positioning, or may be the convex tooth 500.
  • the end surface is in axial contact with the lead-in inclined surface l la2 (Fig. 7-8) in the groove 11, and
  • Fig. 27 is a perspective view showing the structure of the photosensitive drum driving head portion which is positioned by the convex tooth end surface, as shown in the figure, the cylindrical boss
  • the length of the 400 extending in the axial direction of the photosensitive drum is smaller than the length of the straight protruding teeth 500 extending in the axial direction of the photosensitive drum.
  • the engaging surface is formed by a longitudinal chamfering of the end faces of the straight teeth, and the longitudinal direction of the straight teeth is parallel to the axial direction of the photosensitive drum.
  • the root of the straight tooth is a portion where the straight tooth is connected to the end of the drum shaft.
  • Figure 28 is a perspective view of the photosensitive drum driving head used in the embodiment
  • Figure 29 is a right side view of Figure 28, showing the photosensitive drum driving head used in the embodiment and the photosensitive drum driving head in the fifth embodiment
  • the second side 500b2 of the straight convex tooth is disposed along the end of the straight convex tooth a progressive slope of 500b3 toward the root of the straight tooth, the other structures are the same;
  • the angle between the second side 500b2 and the first side 500bl is ⁇ , and the range of ⁇ is between 3_45 °, 20-30° For the best.
  • the width W of the convex tooth 500 inserted into the groove 11 is inversely proportional to the height L, there is the following technical problem: the larger the width W, the stronger the convex tooth strength, and the smaller the height L, the easier the convex tooth is. Conversely, the smaller the width W, the smaller the strength of the convex teeth, the larger the height L, the less likely the convex teeth to escape from the grooves; and the distortion of the roots of the straight teeth 500 and the grooves 11
  • the edge l la3 of the inclined surface l lal meshes to transmit power (shown in FIG. 26 ), which requires high strength of the root position of the straight protruding tooth 500.
  • the structure of the second side 500b2 in this embodiment can solve the above problem.
  • the reason is as follows: Since the second side 500b2 is a progressive slope along the end of the straight tooth toward the root of the straight tooth, that is, the end width of the straight tooth 500 is smaller than the root width, and the straight convex is reduced.
  • the width of the end of the tooth 500 can increase the height of the straight tooth insertion groove 11, and the convex tooth does not easily escape from the groove; increasing the width of the root can increase the strength of the root, so that the straight tooth insertion is satisfied. Under the condition of the height of the groove And increasing the strength of the straight teeth roots.
  • the axial positioning of the photosensitive drum driving head and the image forming apparatus driving head may be such that the end surface of the boss 400 contacts the bottom surface of the groove 11 for axial positioning, or may be the end surface 500b3 and the groove of the convex tooth 500.
  • the bottom surface of Fig. 11 (Fig. 7-8) is axially positioned for contact, as shown in Fig. 30, Fig. 30 is a perspective view showing the structure of the photosensitive drum driving head portion which is positioned by the convex tooth end surface, and it is known that the cylindrical boss 400 is photosensitive.
  • the length extending in the axial direction of the drum is smaller than the length of the straight protruding teeth 500 extending in the axial direction of the photosensitive drum.
  • Figure 31 is a schematic view showing a curved surface connection between the straight and convex teeth. It is understood that the end surface of the boss 400 between the straight convex teeth 500 has a curved surface which is recessed toward the drum axis direction, and ⁇ ⁇ 3 straight convex teeth 500 are used between
  • the arcuate connection can reduce stress concentration at the junction of the boss and the straight convex tooth, so as to prevent breakage of the joint between the boss and the straight tooth when the straight tooth is stressed Phenomenon.
  • FIG. 32 and FIG. 33 are respectively a perspective view showing a structure of a portion of a photosensitive drum driving head provided with a retaining portion, and an internal structural view of the photosensitive drum driving head provided with the retaining portion engaged with the driving head of the image forming apparatus, respectively, for further solving
  • the problem that the straight protruding teeth are easily released from the groove is provided with a retaining portion 500a2 at a position close to the end surface of the straight protruding tooth, and the retaining portion 500a2 extends outwardly perpendicular to the engaging surface 500a.
  • the retaining portion 500a2 is an arcuate body or a hemispherical body extending outward from the distal end of the engaging surface 500a.
  • the retaining portion 500a2 can be engaged with the twisted slope l lal in the groove 11, if the photosensitive drum driving head has a tendency to escape in the axial direction
  • the detachment preventing portion 500a2 abuts against the twisted slope l lal in the recess 11 to cause the photosensitive drum driving head and the image forming apparatus driving head to generate an axial direction pulling force to prevent the photosensitive drum driving head from being driven from the image forming apparatus. Get out of the head.

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Abstract

一种感光鼓驱动头，包括设置在感光鼓端部与感光鼓连接的鼓凸缘（2，200），从鼓凸缘端部轴向伸出的鼓轴，从鼓轴端面轴向伸出的与图像形成装置驱动头上凹槽配合的凸台（4，400），凸台的侧壁上设置有沿凸台径向延伸的与动力传输部匹配的三个直凸齿（500），直凸齿垂直于鼓轴并沿感光鼓轴线的方向延伸，直凸齿上设置有啮合面，啮合面为由直凸齿的端面纵向切角形成，其中至少有一个啮合面与凹槽扭曲斜面上的棱边啮合传递动力。解决了因扭曲形凸台与扭曲形凹配合的扭曲角度精度要求高的技术问题。

Description

一种感光鼓驱动头及图像形成装置驱动机构 技术领域
本发明涉及一种感光鼓驱动头及图像形成装置驱动机构。 背景技术
现有图像形成装置上设置有马达、 图像形成装置驱动头和处理盒， 处理盒可拆卸地安装在图像形成装置中，处理盒上设置有感光鼓和固定 连接在感光鼓端部的感光鼓驱动头； 在图像形成装置工作过程中， 马达 产生动力，并通过图像形成装置驱动头和感光鼓驱动头配合将动力传递 给处理盒， 使处理盒上的感光鼓旋转。
如图 1、 2所示， 感光鼓 7的一端固定地设置有感光鼓驱动头， 该 感光鼓驱动头包括凸形连接轴 17， 该凸形连接轴 17上设置有扭曲形凸 台 17a， 凸台 17a包括末端部 17al ; 凸形连接轴 17的旋转中心与感光 鼓 7的旋转中心重合； 凹形连接轴 18上包括扭曲形凹槽 18a， 凹槽 18a 上设置有底面 18al。
在图像形成装置工作过程中， 图像形成装置驱动头 18接受来自马 达的动力旋转， 凸形连接轴 17与图像形成装置驱动头 18啮合， 旋转动 力通过图像形成装置驱动头 18传递给凸形连接轴 17， 并最终使感光鼓 7旋转。 当凸形连接轴 17与图像形成装置驱动头 18啮合时， 凸形连接 轴 17上的扭曲形凸台 17a***图像形成装置驱动头 18上的扭曲形凹槽 18a内， 末端面 17al与底面 18a2正对， 图像形成装置驱动头 18上的 旋转动力通过扭曲凸台 17a与凹槽 18a的啮合传递给凸形连接轴 17。
如图 3、 4所示分别为扭曲形凸台 17a与扭曲形凹槽 18a不旋转和 旋转时的截面状态示意图； 由图可知， 扭曲形凸台 17a 与扭曲形凹槽 18a的截面均为三角形 （如等边三角形）， 且三角形凸台 17a的尺寸小 于三角形凹槽 18a的尺寸。如图 3所示， 当凸台 17a***到凹槽 18a内 但不随凹槽 18a旋转时， 感光鼓上的凸形连接轴旋转轴 XI与图像形成 装置驱动头的旋转轴 X2不重合。 如图 4所示， 当凸台 17a与凹槽 18a 啮合并随凹槽 18a旋转时，三角形凸台 17a的三个顶角 17a2与凹槽 18a 上三角形的三条棱边啮合，并从凹槽 18a上传递动力给凸形连接轴 17a; 此时， 感光鼓上的凸形连接轴旋转轴 XI与图像形成装置驱动头的旋转 轴 X2重合， 保证扭曲形凸台 17a与扭曲形凹槽 18a在工作过程中传动 平稳； 图中， R0为凸台 17a三个顶角 17a2的旋转圆直径， R1为三角形 凹槽 18a的内切圆直径， R2为凹槽 18a的三个顶角旋转圆直径， 为实 现凸形连接轴 17a与图像形成装置驱动头 18a的动力传递， R0、 Rl、 R2 需满足以下条件： R1〈R0〈R2。
如图 5所示为现有技术另一种实施例， 该实施例中扭曲形凸台 17a 和扭曲形凹槽 18a均为四边形 （如正四边形）， 四边形凸台 17a与四边 形凹槽 18a啮合， 并传递动力。
现有技术中图像形成装置驱动头还可以采用如图 6所示方式，如图 6所示， 图像形成装置驱动头 28 的一端设置有扭曲形凹槽 28a， 凹槽 28a上设置有底面 28al和凸台 28a2， 凸台 28a2位于扭曲三角形凹槽 28a的中心（凸台的旋转中心与图像形成装置驱动头的旋转轴 X2重合）， 其高度与凹槽 28a的深度基本相同， 所述凸台可以是锥形。
现有图像形成装置上使用的一种处理盒上普遍使用到上述带有感 光鼓驱动头的感光鼓， 所述处理盒上至少包括： 用于形成静电潜像的、 带有上述感光鼓驱动头的感光鼓，将所述静电潜象显影的显影剂和将所 述显影剂传送给感光鼓的显影辊。所述处理盒安装到图像形成装置上使 用时，通过上述图像形成装置驱动头接收来自图像形成装置上来自马达 的旋转动力， 使所述感光鼓和显影辊旋转。
现有技术的这种动力传递结构存在以下缺点：
1.扭曲形凸台与扭曲形凹槽啮合时，凸台和凹槽上扭曲面的扭曲角 度精度要求较高。当凸台上的扭曲面与凹槽上的扭曲面因制造精度问题 而产生扭曲角度不一致时，凸台上的扭曲面与凹槽上的扭曲面就产生点 对面接触， 其中之一的扭曲面在凸台与凹槽的啮合过程中就会发生变 形， 从而造成感光鼓上的凸形连接轴旋转轴 XI与图像形成装置驱动头 的旋转轴 X2不重合， 影响动力传递的平稳性； 为避免上述问题， 就要 求凸台和凹槽的扭曲面制造精度很高， 这样增加了生产制造成本， 同时 带来生产制造困难等问题。
2.凸台与凹槽的多边形形状难以加工，对凸台和凹槽的制造精度要 求较高。 以等边三角形为例， 等边三角形凸台与凹槽的精度要求较高， 才能保证三角形中心位置的精度，否则在凸台与凹槽啮合时感光鼓上的 凸形连接轴旋转轴 XI与图像形成装置驱动头的旋转轴 X2就会发生不重 合现象， 从而造成传动不平稳； 另外， 在凸台与凹槽的啮合过程中， 凸 台上三角形的顶角因要传递动力， 因此容易因受力而发生变形， 长期工 作易受到磨损或破坏； 而三角形的三个顶角在工作过程中， 同时起到受 力旋转和支撑定位作用，因此磨损或破坏后的三角形在与凹槽的啮合过 程中， 易产生中心 XI、 X2不重合的现象， 从而影响传动的平稳性， 因 此为保证传动的精度和平稳性，对三角形凸台的材料硬度和耐磨性要求 较高； 同样的， 三角形凹槽的棱边上、 与凸台的三个顶角接触的位置在 工作过程中也易受到破坏或磨损，对三角形凹槽的硬度和耐磨性同样要 求较高。 发明内容
本发明提供一种感光鼓驱动头及图像成装置驱动机构， 以解决现有 感光鼓驱动头因扭曲形凸台与扭曲形凹配合的扭曲角度精度要求高的技 术问题。
为了解决以上技术问题， 本发明采取的技术方案是：
一种感光鼓驱动头，与图像形成装置驱动头配合传递驱动力，所述图 像形成装置驱动头包括：具有三角形横截面的扭曲形凹槽，设置在所述扭 曲形凹槽的三个顶角内的动力传输部，动力传输部包括扭曲斜面，所述扭 曲斜面的顶部包括与所述感光鼓驱动头啮合的棱边， 其特征是，所述感光 鼓驱动头包括：设置在感光鼓端部与感光鼓连接的的鼓凸缘，从鼓凸缘端 部轴向伸出的鼓轴，从所述鼓轴端面轴向伸出的与图像形成装置驱动头上 凹槽配合的凸台，所述凸台的侧壁上设置有沿凸台径向延伸的与所述动力 传输部匹配的三个直凸齿，所述直凸齿垂直于所述鼓轴并延所述感光鼓轴 线的方向延伸， 所述直凸齿上设置有啮合面，所述啮合面为由所述直凸齿 的端面纵向切角形成，其中至少有一个所述啮合面与所述凹槽扭曲斜面上 的棱边啮合传递动力。 所述直凸齿还包括：第一侧面和第二侧面；所述第一侧面和所述第二 侧面相互平行且与所述鼓轴的端面垂直。
所述直凸齿还包括：第一侧面和第二侧面；所述第一侧面所述鼓轴的 端面垂直，所述第二侧面为倾斜设置，所述直凸齿的宽度沿所述直凸齿的 端部向所述直凸齿的根部方向逐渐增大。
在采用了上述技术方案后， 将感光鼓驱动头作为动力传输部的凸齿 设置成直的，解决了现有感光鼓驱动头因扭曲形凸台与扭曲形凹配合的扭 曲角度精度要求高的技术问题。 附图说明
图 1为现有技术中带有感光鼓驱动头的感光鼓立体示意图。
图 2为现有技术中凸形连接轴与凹形连接轴的立体示意图。
图 3 为现有技术扭曲形突起与扭曲形凹槽不旋转时的截面状态示意 图。
图 4为现有技术扭曲形突起与扭曲形凹槽旋转时的截面状态示意图。 图 5为现有技术另一种突起与凹槽的形状为四边形。
图 6为现有技术中凹槽的中心位置设置有凸台的示意图。
图 7为图像形成装置驱动头的立体示意图。
图 8为图像形成装置驱动头的俯视图。
图 9为实施例一所采用的感光鼓驱动头的立体示意图。
图 10为实施例一所采用的感光鼓驱动头与图像形成装置驱动头装配 的受力分析示意图。
图 11为实施例二所采用的感光鼓驱动头的立体图。 图 12为实施例二所采用的感光鼓驱动头的正视图。
图 13为实施例二所采用的感光鼓驱动头与图像形成装置驱动头装配 俯视图。
图 14为实施例二所采用的感光鼓驱动头与图像形成装置驱动头装配 示意图。
图 15为实施例二所采用的图像形成装置驱动头与感光鼓驱动头啮合 后的截面受力分析示意图。
图 16为实施例三所采用的感光鼓驱动头的立体示意图。
图 17为实施例四所采用的感光鼓驱动头的立体示意图。
图 18为本发明所采用的凸台的局部放大图。
图 19为图 18沿 B方向的正视图。
图 20为本发明所采用的凸台的俯视图。
图 21为实施例五所采用的感光鼓驱动头的立体示意图。
图 22为实施例五所采用的感光鼓驱动头的俯视图。
如图 23为实施例五所采用的感光鼓驱动头与图像形成装置驱动头的 装配俯视图。
图 24 ( a)为实施例五所采用的感光鼓驱动头与图像形成装置驱动头 装配的右视图。
图 24 (b ) 为图 24 ( a) 沿 C方向的剖面图。
图 25为图 23沿 A方向的剖面图。
图 26为图 23沿 B方向的剖面图。
图 27为实施例五中采用凸齿端面定位的感光鼓驱动头部分结构立体 示意图。 图 28为实施例六所采用的感光鼓驱动头的立体示意图。
图 29为图 28的右视图。
图 30为实施例六中采用凸齿端面定位的感光鼓驱动头部分结构立体 示意图。
图 31为实施例六中直凸齿间采用弧面连接的示意图。
图 32为实施例六中设置有防脱部的感光鼓驱动头部分结构立体示意 图。
图 33为实施例六中设置有防脱部的感光鼓驱动头与图像形成装置驱 动头啮合后的内部结构图。 具体实施方式
实施例一
图 7和图 8分别为图像形成装置驱动头的立体示意图和俯视图，由 图知，图像形成装置驱动头 20包括：具有等边三角形横截面的凹槽 11， 设置在三角形的三个顶角并具有扭曲结构的动力传输部 11a 和位于三 角形三边位置的限位部 lib; 动力传输部 11a包括扭曲斜面 llal和导 入斜面 lla2。 由图 7所示的俯视图可知， 扭曲斜面 llal是不可见的， 扭曲斜面 llal与凹槽底面的夹角小于 90° ， 扭曲斜面 llal的顶部包 括棱边 lla3; 导入斜面 lla2是可见的， 导入斜面 lla2与凹槽底面的 夹角大于 90° 。 图像形成装置驱动头与图像形成装置中的马达连接传 递动力。
所述图像形成装置驱动头 20 与现有技术的图像形成装置驱动头 是相同的。 图 9为实施例一所采用的感光鼓驱动头的立体示意图， 由图知， 感 光鼓驱动头包括： 设置在感光鼓 1端部与感光鼓 1连接的鼓凸缘 2， 鼓 凸缘 2用于将接收的驱动力传递给感光鼓 1， 从鼓凸缘 2端部轴向伸出 的鼓轴 3， 鼓轴 3用于在处理盒工作过程中可旋转地支撑感光鼓 1， 从 鼓轴 3端面轴向伸出、 用于从图像形成装置驱动头 20上接收驱动力的 凸台 4， 凸台 4的侧壁 4b上设置有沿凸台 4径向延伸的第一凸齿 5a， 其中第一凸齿 5a倾斜地设置在凸台侧壁 4b上。
在驱动力传递过程中， 位于感光鼓驱动头凸台 4上的第一凸齿 5a 与任一动力传输部 11a啮合传递动力， 感光鼓驱动头的凸台侧壁 4b与 图像形成装置驱动头凹槽的限位部 l ib在三个切点 Pl， P2和 P3处相切 啮合，从而实现在驱动力传递过程中感光鼓驱动头与图像形成装置驱动 头 20之间的中心重合对中。
图 10为感光鼓驱动头与图像形成装置驱动头装配的受力分析示意 图， "A"为图像形成装置驱动头的旋转方向， 图像形成装置驱动头对第 一凸齿 5a产生的力为 Fl l， F11分解为法向力 F12和径向力 F14， F15 为图像形成装置驱动头在切点 P1处产生的力， F13为图像形成装置驱 动头在切点 P2处产生的力， P3处不受力， 综上可得如下受力分析式：
Figure imgf000010_0001
得到 F13=2 · F14, F\5 = ^F\2 , 即图像形成装置驱动头或感光鼓驱动
3 头在 P1处受到 ^ F12大小的力， 在 P2处受到 2 · F14大小的力。
3 因为感光鼓驱动头与图像形成装置驱动头啮合传递力的过程中，相 互之间存在磨损，本方案中将感光鼓驱动头作为动力传输部的凸齿与作 为定位部的凸台圆柱面设置在不同位置处，使力传递功能与定位功能不 会因为磨损而彼此受到影响。 实施例二
如图 11和图 12所示，分别为本实施例所采用的感光鼓驱动头的立体 图和正视图， 图 13为本实施例所采用的感光鼓驱动头与图像形成装置驱 动头装配俯视图，本实施例中所描述的图像形成装置驱动头采用实施例一 中提到的图像形成装置驱动头， 不再重复描述。 由图知， 感光鼓驱动头包 括： 固定连接在感光鼓 1端部的鼓凸缘 2， 从鼓凸缘 2端部轴向延伸出、 用于在处理盒工作过程中可旋转地支撑感光鼓 1的鼓轴 3，从鼓轴 3端面 轴向伸出、用于从图像形成装置驱动头 20上接收驱动力的圆柱形凸台 4， 圆柱形凸台 4的侧壁 4b上设置有沿圆柱形凸台 4径向延伸、 并与图像形 成装置驱动头中任意两个动力传输部配合的一对凸齿 4a; 凸齿 4a倾斜地 设置在圆柱形凸台 4侧壁 4b上，凸齿 4a上设置有啮合面 4al，啮合面 4al 的面积为 5-20mm2之间， 以 7-16mm2为最佳， 力传递时啮合面 4al与图像 形成装置驱动头中的动力传输部内壁啮合传递动力， 通过在凸齿 4a上设 置啮合面 4al 可以减小所述感光鼓驱动头与图像形成装置驱动头间的磨 损； 凸齿 4a与感光鼓驱动头的旋转轴线间的夹角 β选择为 3-40° 之间， 以 25-30° 为最佳，保证感光鼓驱动头与图像形成装置驱动头能够顺利地 啮合的同时也能够防止在动力传递过程中感光鼓驱动头从图像形成装置 驱动头中脱出， 使图像形成装置驱动头与感光鼓驱动头间稳定的传递动 力； 凸齿 4a从侧壁 4b沿径向方向上的长度为 Ll， L1的范围为 2-5mm之 间， 以 2. 3-3. 3mm最佳， 保证感光鼓驱动头有足够的力矩传递动力； 两个 凸齿 4a间的最小夹角 α标准角度为 120 ° ，角度上限公差一般要在 2 ° 以 内， 本方案中凸齿 4a可允许有 Θ大小的制造精度误差， Θ的范围为 2 ° -10° 之间， 以 2-4° 最佳， 若 Θ为角度误差， 则两个凸齿 4a间的最小夹 角 α大小变为 α + Θ， 此时两个凸齿 4a不会同时与凹槽 11的动力传输部 Ha啮合，位于旋转方向最上游的凸齿先与图像形成装置驱动头上的动力 传输部啮合， 起到缓冲作用， 若凸齿 4a沿旋转方向下游有 Θ角大小的制 造误差尺寸， Θ会使凸齿产生一个渐变的啮合面， 在凸齿 4a与凹槽的动 力传输部 11a啮合过程中为凸齿 4a起到缓冲作用， 可以减小图像形成装 置驱动头与感光鼓驱动头间的损坏； 位于两个凸齿 4a间的凸台圆柱面与 图像形成装置驱动头的限位部 l ib接触实现感光鼓驱动头的定位。在凸齿 4a 与凸台圆柱面连接处还设置圆角以减小应力集中。 且上述感光鼓驱动 头中的鼓凸缘 3、鼓轴 3、圆柱形凸台 4和凸齿 4a可以为同种材料一体制 作成型，也可以具有缓冲结构，鼓凸缘 2上还可以设置有将驱动力传递给 其他元件 （如显影元件等） 的鼓齿轮 2a。
图 14为感光鼓驱动头与图像形成装置驱动头装配示意图，图 15为图 像形成装置驱动头与感光鼓驱动头啮合后的截面受力分析示意图， 由图 知， 感光鼓驱动头与图像形成装置驱动头凹槽的限位部 l ib 在三个切点 P4、 P5和 P6处相切啮合， "A"为图像形成装置驱动头的旋转方向， 图像 形成装置驱动头对感光鼓驱动头产生大小相同的力 F24和 F56，在感光鼓 驱动头承受的扭矩为实施例一扭矩两倍的情况下， F24和 F56与实施例一 中的 F11是大小相同的力， F24分解为法向力 F2和径向力 F4， F56分解 为法向力 F5和径向力 F6，F2和 F5与实施例一中的 F12大小相同， F4和 F6与现有技术中的 F14大小相同， 假设 F1为图像形成装置驱动头在切 点 P5处产生的力， F3为图像形成装置驱动头在切点 P6处产生的力， P4 不 受 力 ， 综 上 可 得 如 下 受 力 分 析 式 ： 得到 Fl=2 *F4和 F3=0， 即图像形
Figure imgf000013_0001
成装置驱动头和感光鼓驱动头在 P5处受到 2 -F4大小的力，在 P6处受力 为 0， 相对于实施例一本方案受力点减少， 降低了图像形成装置驱动头与 感光鼓驱动头在切点 P5和 P6处的磨损，使感光鼓驱动头的定位稳定性提 高， 从而使驱动力的传递更平稳。
一种图像成装置驱动机构， 包括上述实施例中描述的感光鼓驱动头和 背景技术中所描述的图像形成装置驱动头 20， 即图像形成装置驱动头 20 包括： 具有等边三角形横截面的凹槽 11， 设置在三角形的三个顶角并具 有扭曲结构的动力传输部 11a和位于三角形三边位置的限位部 l lb。图像 形成装置驱动头与图像形成装置中的马达连接传递动力。 实施例三
本领域的普通技术人员很容易就能想到，两个凸齿中，一个设置为斜 齿， 另一个为直齿， 也能达到同样的技术效果， 图 16为本实施例所采用 的感光鼓驱动头的立体示意图， 由图知， 斜齿 4a倾斜地设置在凸台的侧 壁 4b上， 直齿 4c垂直地设置在侧壁 4b上。 实施例四
当图像形成装置的转速较低时， 图像形成装置驱动头的转矩较小， 感 光鼓驱动头的两个凸齿可以全部设置成直齿，如图 17所示为本实施例所采 用的感光鼓驱动头的立体示意图， 4c为感光鼓驱动头的凸齿，感光鼓驱动 头的制造精度进一步降低。 本发明中，上述实施例中的凸齿 4a上设置还有啮合面 4al，啮合面 4al 的面积为 5-20mm2之间， 以 7-16mm2为最佳， 力传递时啮合面 4al与图像形 成装置驱动头中的动力传输部内壁啮合传递动力，通过在凸齿 4a上设置啮 合面 4al可以减小所述感光鼓驱动头与图像形成装置驱动头间的磨损； 所 述凸齿还包括：顶角 4a4，与所述凸齿侧壁相连的两个相互平行的平面 4a2 和 4a3，且平面 4a2和 4a3与感光鼓轴线间的夹角为 β；所述啮合面还包括： 直边 s l、 s2和斜边 s3; 所述直边 s i和直边 s2是平行的， 斜边 s3与感光鼓轴 线间的夹角 φ为 5-50 ° 之间， 以 10-40 ° 间为最佳， 直边 s i与感光鼓驱动 头中心到凸齿的顶角 4a4的连线间的夹角 γ为 0-90 ° 之间，以 25_45 ° 为最 佳，如图 18-20所示， 图 18中所示的" B"方向与凸台的径向延伸方向平行。
本领域普通技术人员从本发明中， 很容易就能想到， 也可将凸齿设置 成对称的三个，该三个凸齿或均设置为倾斜的凸齿、或均设置为垂直的凸 齿、或其中一个设置为倾斜的凸齿， 另外两个设置为垂直的凸齿、或其中 一个设置为垂直的凸齿，另外两个设置为倾斜的凸齿；也能达到相同的技 术效果。所述倾斜的凸齿是指所述凸齿倾斜的设置在凸台的侧壁上，所述 垂直的凸齿是指所述凸齿垂直的设置在凸台的侧壁上。
本领域普通技术人员从本发明中， 很容易就能想到， 所述凸台的侧壁 和所述凸台圆柱面为同一部件。 实施例五
本实施例中采用的图像形成装置驱动头与上述实施例中的相同。
图 21和图 22本为本实施例所采用的感光鼓驱动头的立体示意图和俯视 图， 感光鼓驱动头包括： 固定连接在感光鼓 1端部的鼓凸缘 200， 从鼓凸缘 200端部轴向延伸出、用于在处理盒工作过程中可旋转地支撑感光鼓 1的鼓 轴 300，从鼓轴 300端面轴向伸出、用于从图像形成装置驱动头 20上接收驱 动力的圆柱形凸台 400，圆柱形凸台 400的侧壁 400a上设置有沿圆柱形凸台 400径向延伸、并与图像形成装置驱动头的动力传输部 1 la配合的三个直凸 齿 500，所述直凸齿 500与感光鼓轴线间的夹角为 0度， 圆柱形凸台 400沿感 光鼓轴向方向上延伸的长度大于直凸齿 500沿感光鼓轴向方向上延伸的长 度。
如图 23为感光鼓驱动头与图像形成装置驱动头的装配俯视图，图 24 ( a) 为感光鼓驱动头与图像形成装置驱动头装配的右视图， 图 24 (b ) 为图 24
( a)沿 C方向的剖面图， 图 25和图 26分别为图 23沿 A和 B方向的剖面图。 由 图知，所述直凸齿 500包括：啮合面 500a，第一侧面 500bl和第二侧面 500b2; 第一侧面 500bl和第二侧面 500b2相互平行且与鼓轴 300的端面垂直， 并与 感光鼓轴线平行；啮合面 500a与鼓轴 300的端面垂直且与感光鼓轴线平行， 啮合面 500a与第一侧面 500bl间的斜切角度 γ与凹槽 11内的扭曲斜面 l lal
(图 7-8) 的斜度相匹配， 增加啮合面 500a与扭曲斜面 l lal啮合传递动力 时的接触面积， 斜切角度 Y为 0-90° 之间， 以 20-45 ° 为最佳， 如图 21-22 所示。 直凸齿 500与图像形成装置驱动头 20啮合传递动力时， 直凸齿 500 的根部与扭曲斜面 l lal的棱边 l la3 (图 7_8) 啮合， 即啮合面 500a上的一 条线与棱边 l la3 (图 7-8)啮合传递动力；所述啮合面 500a的面积为 2-20mm 2， 以 3-10 mm2为最佳， 如图 23_26。 为使凸台 400更容易***到凹槽 11中， 凸台 400设置成锥形， 即凸台端部的截面圆外径 dl小于凸台根部的截面圆 外径 d2， 如图 25。如图 26， 因为图像形成装置驱动头 20的内部结构是沿一 定方向进行扭转的， 凹槽 11内的扭曲斜面 l lal和导入斜面 l la2 (图 7_8 ) 是倾斜的，所以凸齿 500***凹槽内的宽度 W的大小与高度 L的大小成反比， 即宽度越大， 高度越小； 凸齿 500的宽度 W与其强度成正比， 即宽度越大， 强度越强， 高度越小， 凸齿越容易从凹槽中脱出； 高度 L的范围为
1. 0-8. 0mm,以 2. 0-4. 0mm为最佳，宽度 W的范围为 1. 0-5. 0mm,以 1. 5-4. 0mm 为最佳， 以达到既满足传递动力时的强度要求， 又保证凸齿 500不易从凹 槽中脱出。
本实施例中， 如图 25所示， 感光鼓驱动头与图像形成装置驱动头的轴 向定位可以是凸台 400的端面与凹槽 11的底面接触进行轴向定位， 也可以 是凸齿 500的端面与凹槽 11内的导入斜面 l la2(图 7-8 )接触进行轴向定位， 图 27为采用凸齿端面定位的感光鼓驱动头部分结构立体示意图， 由图知， 圆柱形凸台 400沿感光鼓轴向方向上延伸的长度小于直凸齿 500沿感光鼓 轴向方向上延伸的长度。
所述啮合面为由所述直凸齿的端面纵向切角形成， 所述直凸齿的纵向 方向与所述感光鼓的轴线方向平行。
所述直凸齿的根部为所述直凸齿与所述鼓轴端部连接的部分。
实施例六
图 28为本实施例所采用的感光鼓驱动头的立体示意图， 图 29为图 28的 右视图， 由图知，本实施例所采用的感光鼓驱动头与实施例五中的感光鼓 驱动头的区别在于直凸齿的第二侧面 500b2是设置成沿所述直凸齿的端部 500b3向所述直凸齿的根部方向的一个渐进斜面， 其他结构均相同； 第二 侧面 500b2与第一侧面 500bl间的夹角为 ω， ω的范围为 3_45 ° 之间， 以 20-30° 为最佳。 在实施例五中， 由于凸齿 500***凹槽 11中的宽度 W与高 度 L成反比， 即存在以下技术问题： 宽度 W越大， 凸齿强度越强， 高度 L越 小， 凸齿越容易从凹槽中脱出； 反之， 宽度 W越小， 凸齿强度越小， 高度 L 越大， 凸齿越不容易从凹槽中脱出； 又由于直凸齿 500的根部与凹槽 11内 的扭曲斜面 l lal的棱边 l la3啮合传递动力（图 26所示），这就对直凸齿 500 的根部位置的强度要求较高， 本实施例中的第二侧面 500b2的结构正好可 以解决上述问题， 原因如下： 因为第二侧面 500b2是一个沿所述直凸齿的 端部向所述直凸齿的根部方向的渐进斜面， 即直凸齿 500的端部宽度小于 根部宽度， 减小直凸齿 500的端部宽度可以增加所述直凸齿***凹槽 11的 高度， 凸齿不容易从凹槽中脱出； 增加根部宽度可以增加根部的强度， 从 而使在满足所述直凸齿***所述凹槽中高度的条件下，又增加了所述直凸 齿根部的强度。
本实施例中， 感光鼓驱动头与图像形成装置驱动头的轴向定位可以是 凸台 400的端面与凹槽 11的底面接触进行轴向定位，也可以是凸齿 500的端 面 500b3与凹槽 11的底面（图 7-8 )接触进行轴向定位， 如图 30所示， 图 30 为采用凸齿端面定位的感光鼓驱动头部分结构立体示意图， 由图知， 圆柱 形凸台 400沿感光鼓轴向方向上延伸的长度小于直凸齿 500沿感光鼓轴向 方向上延伸的长度。 图 31为直凸齿间采用弧面连接的示意图， 由图知， 直 凸齿 500之间的凸台 400的端面呈向鼓轴方向凹陷的弧面， §Ρ3个直凸齿 500 之间采用弧面连接， 可以减小所述凸台与所述直凸齿结合处的应力集中， 以达到防止所述直凸齿受力时所述凸台与所述直凸齿结合处发生断裂的 现象。
图 32和图 33分别为设置有防脱部的感光鼓驱动头部分结构立体示意图 和设置有防脱部的感光鼓驱动头与图像形成装置驱动头啮合后的内部结 构图， 为进一度解决所述直凸齿易从所述凹槽中脱出的问题， 在啮合面 500a靠近所述直凸齿端面的位置设置防脱部 500a2， 由图知， 防脱部 500a2 垂直于啮合面 500a向外延伸， 防脱部 500a2呈从啮合面 500a的顶端向外延 伸的弧状体或半球状体。所述感光鼓驱动头与所述图像形成装置驱动头啮 合传递动力时， 防脱部 500a2可与凹槽 11内的扭曲斜面 l lal啮合， 若所述 感光鼓驱动头沿轴向方向有脱出趋势， 防脱部 500a2会与凹槽 11内的扭曲 斜面 l lal的抵接，使感光鼓驱动头与图像形成装置驱动头产生轴向方向的 拉力， 防止感光鼓驱动头从所述图像形成装置驱动头中脱出。

Claims

权利要求书
、 一种感光鼓驱动头，与图像形成装置驱动头配合传递驱动力，所述 图像形成装置驱动头包括扭曲形凹槽和动力传输部， 动力传输部包 括扭曲斜面， 所述扭曲斜面包括与所述感光鼓驱动头啮合的棱边， 其特征是，所述感光鼓驱动头包括： 设置在感光鼓端部与感光鼓连 接的的鼓凸缘， 从鼓凸缘端部轴向伸出的鼓轴， 从所述鼓轴端面轴 向伸出的与所述扭曲形凹槽配合的凸台， 所述凸台的侧壁上设置有 沿凸台径向延伸的与所述动力传输部匹配的三个直凸齿。
、 如权利要求 1所述的感光鼓驱动头，其特征是，所述直凸齿垂直于所 述鼓轴并延所述感光鼓轴线的方向延伸。
、 如权利要求 2所述的感光鼓驱动头，其特征是，所述直凸齿上设置有 啮合面，所述啮合面为由所述直凸齿的端面纵向切角形成， 其中至 少有一个所述啮合面与所述凹槽扭曲斜面上的棱边啮合传递动力。 、 如权利要求 2所述的感光鼓驱动头，其特征是，所述直凸齿的根部与 所述凹槽扭曲斜面上的棱边啮合传递动力。
、 如权利要求 2所述的感光鼓驱动头，其特征是， 所述直凸齿还包括： 第一侧面和第二侧面； 所述第一侧面和所述第二侧面相互平行且与 所述鼓轴的端面垂直。
、 如权利要求 2所述的感光鼓驱动头，其特征是， 所述直凸齿还包括： 第一侧面和第二侧面； 所述第一侧面所述鼓轴的端面垂直， 所述第 二侧面为倾斜设置， 所述直凸齿的宽度沿所述直凸齿的端部向所述 直凸齿的根部方向逐渐增大。
PCT/CN2012/086505 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 WO2014005403A1 (zh)

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