Detachable Separation Unit for Sheet Feeding Device
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Solution Overview
Problem
The existing sheet feeding devices in image forming apparatuses face a decrease in separation performance due to abrasion in the separation unit, which affects the reliable conveyance of single sheets and prevents double-feed prevention.
Innovation Solution
A sheet feeding device with a detachable separation unit that includes a separation rotating member, a biasing member, and an engaged member, allowing the separation unit to move between attached and detached positions, utilizing a torque limiter and a separation nip release mechanism to ensure proper sheet separation and easy detachment for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the separation unit is made detachable to improve maintenance ease, then the ease of repair is improved, but the device complexity increases
Solution Approach 1:
The sheet feeding device is divided into separate functional units: a fixed main body and a detachable separation unit. The separation unit, which contains the separation roller and biasing member, can be independently removed and replaced without affecting the rest of the device, enabling easy maintenance while keeping each component relatively simple in structure.
Solution Approach 2:
An engagement member acts as an intermediary mechanism between the separation unit and the main body. This engagement member facilitates the detachable connection by providing a simple interface that can be engaged and disengaged easily, reducing the complexity of the overall detachment system while enabling straightforward replacement.
2Reliability
If the separation roller uses high friction coefficient material to improve separation performance, then the separation performance is improved, but abrasion occurs leading to performance degradation over time
Solution Approach 1:
The separation unit, including the separation roller with high friction coefficient material, is designed as a consumable component that can be easily replaced. When abrasion occurs and performance degrades, the entire separation unit is discarded and replaced with a new one, rather than attempting to repair or restore the original component. This maintains consistently high separation performance throughout the device's operational life.
Solution Approach 2:
The separation unit is designed as an inexpensive, easily replaceable component. By using cost-effective materials and simple construction for the separation roller and biasing member, the system allows frequent replacement without significant cost or complexity, ensuring that fresh, high-performance components are always in use.
3Ease of operation
If the engagement member moves automatically to second position for detachment, then the ease of operation is improved, but control precision may be reduced
Solution Approach 1:
The engagement member is designed to automatically move from the first position (engaged state) to the second position (disengaged state) through a simple user action. When the user pulls the separation unit in the detachment direction, the engagement member self-actuates to release the engagement, eliminating the need for separate control mechanisms and simplifying the operation while maintaining sufficient positioning accuracy for the application.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the usability and maintenance of the separation unit by improving its detachment process, maintaining separation performance and preventing double feeds, thus ensuring reliable sheet conveyance and reducing the need for frequent unit replacements.
Implementation Method 1
a biasing member configured to bias the separation rotating member toward the feeding unit
Implementation Method 2
a separation unit using a method of forming a nip between a feed roller and a separation roller formed of rubber with a high friction coefficient
Data Source
AI summary
A sheet feeding device includes a stacking member, a feeding unit, and a detachable separation unit. The feeding unit feeds sheets stacked from the stacking member. The separation unit separates the fed sheets one by one. The separation unit includes a rotating member to abut and separate from the feeding unit and to rotate, a biasing member to bias the rotating member toward the feeding unit, and an engaged member to be engaged with an engagement member included in the sheet feeding device. The engagement member can move to a first position where the engagement member is engaged with the engaged member, and a second position away from the engaged member. Where the engagement member moves from the first to the second position when the separation unit is attached to the sheet feeding device, the separation unit moves in a detachment direction using the biasing member.