Photosensitive drum drive assembly, photosensitive drum and processing cartridge

Abstract

The invention provides a photosensitive drum drive assembly, a photosensitive drum having the drive assembly and a processing cartridge. The photosensitive drum drive assembly comprises a gear capable of being tightly mounted on one end of a drum body, and an axial adjusting assembly capable of making reciprocating movement relative to the gear along the axial direction of the gear, wherein the axial adjusting assembly includes a driving force receiving head capable of being matched with a driving force output head, a driving lever and a shift pin; one end of the driving lever is inserted into the gear along the axial direction; the driving force receiving head is fixed on the outer end of the driving lever and is located outside the gear; the shift pin is fixed on a portion of the driving lever located in the gear; and a stop section capable of being matched with the shift pin to prevent the driving lever from rotating relative to the gear is arranged in the gear. According to the invention, the service life of a motor, a motor transmission gear and the driving force output head of an imaging apparatus can be prolonged, and the use accuracy and the service life of the inner surface of a round hole on the sidewall of the processing cartridge and the outer surface of a shaft of the photosensitive drum drive assembly can be improved.

Description

technical field [0001] The present invention relates to a photosensitive drum driving assembly and a photosensitive drum and a process cartridge having the same. Background technique [0002] Imaging devices such as laser printers, copiers, fax machines, etc. typically use a removable process cartridge as a receptacle for replenishing toner and cooperates with it to form images on media. The driving force required for the moving parts of the process cartridge is provided by a motor within the imaging device. There are mainly two driving force transmission modes between the driving force receiving part of the process box and the driving force output mechanism of the motor: one is the process box disclosed in US Pat. No. 4,829,335. The helical gear at one end of the photosensitive drum is engaged with the helical gear of the photosensitive drum on the process cartridge through the helical gear of the driving part on the imaging device to drive the photosensitive drum to rotat...

AI Technical Summary

Problems solved by technology

exist figure 2 In the transmission mode shown, through the protrusion 9 of the photosensitive drum drive assembly, the shaft portion with the outer peripheral surface 93, the gear portion 94, the driving force from the driving force output head 8 is transmitted to the drum body; During the printing process of the imaging device, due to the presence of unstable factors such as vibration in the image forming device and the internal environment of the process box, the axis 81 of the driving force output head 8 cannot completely coincide with the axis 95 of the photosensitive drum driving assembly. When printing starts, The driving force output head 8 drives the photosensitive drum driving assembly to rotate around the axis 81 of the driving force output head 8, and the shaft portion of the photosensitive drum driving assembly rotates around the axis 81 of the driving force output head 8 instead of the axis 95 of the photosensitive drum driving assembly, so that the photosensitive drum The rotational diameter of the shaft portion of the drum drive assembly is larger than the actual diameter of the shaft portion of the photosensitive drum drive assembly, and the outer surface 93 of the shaft portion of the photosensitive drum drive assembly is rotatably supported by the inner surface 42 of the circular hole of the side wall 4, and both The matching gap between them is extremely small (usually between 0.05-0.10mm), which causes strong friction between the outer surface of the shaft of the photosensitive drum drive assembly and the inner surface 42 of the round hole of the side wall 4, resulting in the required driving force The sharp increase caused the motor 5 in the imaging device to be overloaded, which affected the life of the motor 5, gear 6, gear 7 and driving force output head 8 of the imaging device, and also affected the inner surface of the round hole of the side wall 4 and the photosensitive drum Service accuracy and service life of the outer surface 93 of the shaft portion of the drive assembly

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