A kind of drive assembly of photosensitive drumTechnical field
The present invention relates to a kind of drive assembly of photosensitive drum for image processing system.
Background technology
Cartridge is a kind ofly can removably pack the box in image processing system main frame into, and this box includes an electronic photographic sensitive assembly as an integral unit and at least such as charger, developer, of the processor of clearer etc. and so on.Because cartridge is removably installed with respect to device Host, be therefore convenient to the maintenance of equipment.The electronic photographic image forming device that adopts electrophotographic image forming mode is work like this: by the light of image processing system, the electronic photographic sensitive assembly of charger uniform charging is carried out to selectively exposure and form electrostatic latent image, this latent image becomes toner image by developer by toner development, the toner image forming is transferred on recording medium by transfer implement, to form image on recording materials.
As shown in Figure 1, power delivery mode between a kind of photosensitive drum driving head 17 and image processing system driving head 18 on cartridge is disclosed in the prior art, the end of image processing system driving head 18 is provided with a spiral fashion triangular groove 18a, and being provided with a spiral helicine triangular hill 17a accordingly, the end of photosensitive drum driving head 17 coordinates transmission with above-mentioned triangular groove 18a, although this mode transmission of drive force effectively, but spiral triangular hill 17a structure fabrication complex process, and the required cost compare of die sinking is high, the stress ratio that while cooperation with image processing system driving head 18, contact point produces is larger, after long-time use, photosensitive drum driving head 17 is easier to damage, and then affect transmission accuracy and efficiency.
Summary of the invention
The invention provides a kind of drive assembly of photosensitive drum, affect the technical matters of transmission accuracy and efficiency to solve easy damage of power receiving portion of existing drive assembly of photosensitive drum.
In order to solve above technical matters, the technical scheme that the present invention takes is:
A kind of drive assembly of photosensitive drum, comprise the drum gear that is arranged on photosensitive drums end and is connected with photosensitive drums, be arranged in the power transfering part of drum gear and be arranged on described power transfering part for receive the power receiving portion of driving force from image processing system driving head, it is characterized in that, between described drum gear and power transfering part, be provided with buffering resetting-mechanism.
On described power transfering part, be provided with along the radially-protruding trundle of power transfering part, on described drum gear, be provided with the strength of gear portion coordinating with described trundle in power transmission process.
Described buffering resetting-mechanism is elastomeric element, on described power transfering part, be provided with support column, elastomeric element force column, on described drum gear, be provided with elastomeric element reference column, described elastomeric element is wire-wrapped on described support column and a free end is fixedly connected with described elastomeric element reference column, and another free end is positioned at elastomeric element force column one side.
Described trundle connects described power receiving portion and power transfering part regularly.
Described trundle, power receiving portion and power transfering part are formed in one.
Described power transfering part runs through drum gear, is also provided with draw-in groove on described power transfering part, and described power transfering part is by the axial location of an axial location part and described draw-in groove clamping realization and described drum gear.
Described drive assembly of photosensitive drum axial location part is jump ring.
Described elastomeric element is torsion spring.
Adopting after technique scheme, owing to being provided with buffering resetting-mechanism between drum gear and power transfering part.Image processing system driving head can be by the buffering resetting-mechanism buffering that resets during by power receiving portion and power transfering part drive drum gear, greatly reduced the stress producing when image processing system driving head coordinates with power receiving portion, the power receiving portion that has solved existing drive assembly of photosensitive drum is easily damaged and is affected the technical matters of transmission accuracy and efficiency.And reduced photosensitive drums cost of manufacture, in the serviceable life of effectively having improved photosensitive drums, ensure the smooth transfer of driving force between photosensitive drums and image processing system driving head.
Brief description of the drawings:
Fig. 1 is the exploded view between image processing system driving head and photosensitive drum driving head in prior art;
Fig. 2 is the exploded view of drive assembly of photosensitive drum in the embodiment of the present invention;
Fig. 3 A is the three-dimensional diagram that in the embodiment of the present invention, drive assembly of photosensitive drum coordinates front drive assembly of photosensitive drum with image processing system;
Fig. 3 B is the vertical view that in the embodiment of the present invention, drive assembly of photosensitive drum coordinates front drive assembly of photosensitive drum with figure apparatus for converting;
Fig. 3 C is that in the embodiment of the present invention, image processing system driving head has just stretched out the three-dimensional diagram while cooperation with drive assembly of photosensitive drum;
Fig. 4 A is the three-dimensional diagram of drive assembly of photosensitive drum when image processing system driving head and drive assembly of photosensitive drum transmission in embodiment in the present invention;
Fig. 4 B is the vertical view that in the present invention, drive assembly of photosensitive drum coordinates drive assembly of photosensitive drum while rotation with image processing system;
Fig. 4 C is three-dimensional diagram when image processing system driving head drives drive assembly of photosensitive drum transmission in the embodiment of the present invention;
Embodiment:
Also by reference to the accompanying drawings the present invention is described in further details below by concrete embodiment.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 2, drive assembly of photosensitive drum 10 of the present invention comprises: be arranged on the drum gear 2 that photosensitive drums 1 end is connected with photosensitive drums 1; Be arranged in the power transfering part 3 of drum gear 2; Between image processing system (not shown) and cartridge (not shown), realize the elastomeric element 4 that plays buffering reset function when driving force is transmitted for one; One is arranged in power transfering part 3 for receive the power receiving portion 5 of driving force from image processing system driving head; One is fixedly connected with power transfering part 3 and power receiving portion 5 and from the power transfering part 5 radially-protruding trundles 6 in two ends.Elastomeric element 4 is arranged on the support column 3a of power transfering part 3, the support column 3a of power transfering part 3 runs through drum gear 2, it is upper that a free end 4a of elastomeric element 4 is fixed on the elastomeric element reference column 2a being arranged on drum gear 2, and another free end 4b is arranged on a side of the elastomeric element force column 3b on power transfering part 3; In power receiving portion 5, be provided with power receiving portion reference column 5d, and on power transfering part 3, be provided with the power receiving portion pilot hole 3d that holds power receiving portion reference column 5d, between power acceptance division reference column 5d and power receiving portion pilot hole 3d, be fixedly connected with by trundle 6, this trundle 6 in the time that driving force is transmitted can with the 2b of the strength of gear portion butt transmission of drive force being arranged on drum gear 2; In addition, drive assembly of photosensitive drum 10 of the present invention also comprises and being arranged on power transfering part 3 for realizing the axial location part 7 of drive assembly of photosensitive drum 10 axial location, this axial location part 7 and draw-in groove 3c clamping on the power transfering part 3 of gear 2, in the present embodiment, axially keeper 7 is jump ring replacement.
Just specifically describe the whole driving force transmittance process between this concrete drive assembly of photosensitive drum 10 and image processing system driving head 8 that cushions reset function below, as shown in Fig. 3 A and 3B, before realizing driving force transmission, the elastomeric element force column 3b being positioned in drive assembly of photosensitive drum 10 on power transfering part 3 can freely rotate in the H scope shown in Fig. 3 B under the restriction of its elastomeric element free end 4b and the 2b of strength of gear portion, thereby ensure that drive assembly of photosensitive drum 10 receives the optimum position of driving force at every turn from image processing system (not shown), elastomeric element 4 used in the present embodiment is torsion spring.
As shown in Figure 3 C, in the time that image processing system driving head 8 axially stretches out, power receiving portion 5 in image processing system driving head 8 and drive assembly of photosensitive drum 10 first can be in Fig. 3 C position combination, now in Fig. 3 B, being positioned at elastomeric element force column 3b on power transfering part 3 starts and the free end 4b butt of elastomeric element 4, make whole drive assembly of photosensitive drum 10 under the effect of elastomeric element 4 in by Pre strained state, as shown in Figure 4 C, in the time that image processing system driving head 8 starts to rotate with the power receiving portion 3 in certain rotating speed drive drive assembly of photosensitive drum 10, now drive assembly of photosensitive drum 10 can start to overcome the elastic force of elastomeric element disposed thereon 4, finally under the drive of image processing system driving head 8, start with acceleration relative and that image processing system driving head 8 is slower, in the time starting to start butt with two 2b of strength of gear portion of drum gear 2 from power transfering part 3 trundle that radially stretch out at two ends 6, now, image processing system driving head 8 will drive drive assembly of photosensitive drum 10 and photosensitive drums 1 with identical rotational speed, thereby effectively slow down the impact that the impulsive force that forms because of image processing system driving head 8 high-speed rotation forms image processing system driving head 8 and drive assembly of photosensitive drum 10 between the two.As shown in Figure 4 A and 4 B shown in FIG., in the process of the normal transmission running of image processing system driving head 8 and drive assembly of photosensitive drum 10, elastomeric element 4 under the butt of power transfering part force column 3b all the time in elastically-deformable Pre strained state, thereby the latent lesion that has effectively prevented the instant impact at every turn producing in the process of acceleration or deceleration because of image processing system driving head 8 to form image processing system driving head 8 and drive assembly of photosensitive drum 10 between the two.
In the time that image processing system completes print out task, image processing system driving head 8 can axial retraction separate with drive assembly of photosensitive drum 10, now drive assembly of photosensitive drum 10 can go back to the original position of Fig. 3 B under the acting force of its elastomeric element 4 from Fig. 4 B position, so that next drive assembly of photosensitive drum 10 continues to have coordinated print out task next time with image processing system driving head 8.
In order to make the assembly production process of photosensory assembly 10 in above-described embodiment simpler, above-described embodiment medium power receiving portion 5, power acceptance division 3 and trundle 6 also can take integral type to make moulding, elastomeric element 4 also can use the limiting component such as leaf spring, extension spring, and power receiving portion 3 also can directly be connected to the axial location that realizes drive assembly of photosensitive drum 10 in drum gear 2.