Movable Cover Protects Drive Transmission Member
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Solution Overview
Problem
Conventional image forming apparatuses expose drive transmission members when the cartridge is unmounted, risking damage and increasing costs due to the use of electrical interlocking switches.
Innovation Solution
A movable protecting member that covers the drive transmission member when the cartridge is unmounted, preventing exposure and allowing engagement only when the cartridge is mounted, thus protecting the drive transmission member at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical interlocking switches are used to prevent access to drive transmission members, then safety is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive electrical interlocking switches with a simple mechanical cover structure that can be easily manufactured and replaced. The cover is a basic mechanical component rather than an electrical system, reducing overall device complexity and cost while maintaining the safety function of preventing access to drive transmission members.
Solution Approach 2:
The patent applies mechanical substitution in reverse - replacing an electrical system (interlocking switches) with a purely mechanical system (movable cover). The cover physically blocks access to the drive transmission member through mechanical means rather than using electrical interlocks, simplifying the overall system.
2Reliability
If electrical interlocking switches are used to prevent access to drive transmission members, then safety is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a cost-effective mechanical cover instead of expensive electrical interlocking switches. The cover is a simple mechanical component that is cheaper to manufacture and install, reducing the overall manufacturing cost while maintaining the essential safety function of preventing operator access to drive transmission members.
3Ease of operation
If drive transmission members are exposed when cartridge is unmounted, then ease of operation is improved, but risk of damage increases
Solution Approach 1:
The patent uses a dynamic movable cover that changes position based on cartridge installation state. When the cartridge is mounted, the cover moves to expose the drive transmission member for engagement, facilitating ease of operation. When the cartridge is removed, the cover automatically returns to its protective position, preventing damage. This dynamic behavior resolves the contradiction between accessibility and protection.
Solution Approach 2:
The movable cover operates automatically based on the presence or absence of the cartridge, without requiring manual intervention. The cover self-adjusts its position to either protect or expose the drive transmission member, providing both safety and operational convenience through autonomous mechanical response.
Data Source
AI summary
An image forming apparatus for forming an image on a recording material includes a mounting portion to which a cartridge is detachably mounted and a drive transmission member for transmitting a driving force by being engaged with a drive-transmitted member provided on the cartridge when the cartridge is mounted to the mounting portion. In addition, a protecting member is movable between a protecting position where the drive transmission member is prevented from being exposed toward the mounting portion and an open position where the protecting member is retracted from the protecting position to expose the drive transmission member to the mounting portion thereby to permit engagement of the drive transmission member with the drive-transmitted member.