Secondary spline coupling, drive transmission device using same, image forming device

Abstract

The present invention relates to a two-stage spline coupler, a drive transmission device using the same and an image forming device. The two-stage spline coupler comprises two outer gears (81, 83) forming teeth on the other circle; and a tubular middle transmission part (85) forming inner gears (82A, 82B) meshed with the above outer gears (81, 83). The outer gear (83) is connected with a drive shaft (50Y), while the outer shaft (81) is connected with a shaft (55). The two outer gears (81, 83) are provided with teeth stretching to the axial direction of the drive shaft (50Y) and the shaft (55). The inner gears (82A, 82B) of the middle transmission part (85) are different in diameter and are of a two-stage structure. In the two inner gears, protuberance treatments are performed on the inner gear (82A) of the smaller diameter and the outer gear (81) connected with the shaft (55). Abrasion of tooth face ends of gears caused by repeated assemblies is avoided.

Description

technical field [0001] The present invention relates to a two-stage spline coupling, a drive transmission device using the same, and an image forming device. Background technique [0002] In image forming apparatuses such as copiers, printers, facsimile machines, and multifunction machines with the above functions, it is known that consumable parts such as photoreceptors are unitized and detachable so that users can replace them. For example, a photoreceptor drum, a charging device, a developing device, and a cleaning device are unitized so that they can be attached to and detached from the main body of the image forming apparatus, and the driving force is transmitted from the main body of the image forming apparatus. In a tandem image forming apparatus having image forming units for four colors of yellow, magenta, cyan, and black, four image forming units are provided for each color. [0003] The image forming unit is mounted on the main body of the image forming apparatus...

AI Technical Summary

Problems solved by technology

In Patent Document 4, a two-stage gear coupling mechanism is disclosed, however, it is disadvantageous to the durability of repeated attachment and detachment by the user.

[0009] That is, in conventional drive transmission devices that use connection means, since there is no consideration of the structure that requires attachment and detachment, such as the image forming unit, etc., there is a risk of damage to the gear teeth on the device side of the image forming device, etc., that are to be attached and detached due to repeated insertion of the unit. the risk of

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