Image Forming Apparatus Synchronization Monochromatic Mode
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Solution Overview
Problem
Conventional image forming apparatuses in monochromatic black-and-white mode experience color deviation due to rotational phase differences between unused and used image bearing members, leading to increased size and complexity, as well as potential mechanical issues.
Innovation Solution
An image forming apparatus with a controller that synchronizes the rotation of all image bearing members in monochromatic mode, keeping unused members spaced from the transfer belt while the active member is in contact, thereby preventing rotational phase deviations and reducing mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional power sources are added to drive unused photosensitive drums in monochromatic mode, then rotational phase synchronization is maintained, but device complexity and size increase
Solution Approach 1:
A single power source is designed to drive all photosensitive drums through a shared transmission mechanism, allowing the same power source to serve multiple functions (driving both used and unused drums in different operational modes) without requiring separate power sources for each drum
Solution Approach 2:
The power transmission mechanisms for multiple photosensitive drums are merged into a single integrated system, where one power source connects to all drums through a common transmission path, combining what would otherwise be separate drive systems
2Device complexity
If unused photosensitive drums are kept stationary in monochromatic mode, then device complexity is reduced, but rotational phase deviation occurs causing color deviation
Solution Approach 1:
The unused photosensitive drums continue to rotate along with the used drum during monochromatic operation, maintaining continuous rotational motion rather than stopping, which preserves their rotational phase alignment and prevents color deviation when switching to color mode
Solution Approach 2:
The unused photosensitive drums are pre-positioned and kept in rotational synchronization with the used drum before color mode operation begins, ensuring they are already in the correct rotational phase when color printing starts, preventing color deviation
3Adaptability or versatility
If separate power sources are used for each photosensitive drum, then operational flexibility is improved, but device size and complexity increase
Solution Approach 1:
The single power source is designed with multi-functionality to accommodate different operational modes (monochromatic and color) by controlling the transmission of rotational force to different subsets of photosensitive drums, providing operational flexibility without requiring separate power sources
Data Source
AI summary
An image forming apparatus includes image bearing members, cleaning blades for removing toner from corresponding image bearing members, and developing devices for developing an electrostatic latent image on corresponding image bearing members with toner. The image forming apparatus is operable in a monochromatic mode in which the toner image is formed only on a predetermined one of the image bearing members, and no image is formed on the other image bearing member. In a monochromatic mode operation, a controller starts to drive the plurality of image bearing members in synchronism with each other in a state that the other image bearing member is spaced from a belt and the predetermined image bearing member is in contact with the belt. The controller is capable of executing a supplying operation for supplying the toner from the developing devices to the cleaning blades by way of the image bearing members, respectively.