Developing Cartridge Swing Arm Pressing Mechanism

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Solution Overview

Problem

The existing developing cartridges in image forming apparatuses, such as laser printers, face limitations in the positioning of the pressed part due to the presence of gears and electrodes on the side wall, restricting the degree of freedom for the pressing mechanism.

Innovation Solution

A developing cartridge design featuring a swing member supported by the case's side walls, allowing the pressed part to move between two postures, thereby increasing the positioning flexibility and allowing the developing roller to be pressed against the photosensitive drum effectively while also enabling easy detachment and replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If gears and electrodes are disposed on the side wall of the developing cartridge, then the developing roller can be driven and fed with current, but the position where the engaging part is formed is significantly limited

Engineering Contradiction:

Improvepositioning flexibility of pressed partVSAvoidcomponent arrangement constraint

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The pressing mechanism is divided into two separate arms (first arm and second arm) that can be positioned independently on opposite sides of the developing roller. This segmentation allows the pressed part to be located at optimal positions without interfering with gears and electrodes on the side wall.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of positioning the pressed part only on the side wall, the solution extends the pressing mechanism to include arms that contact the developing roller from both sides (first side and second side). This dimensional expansion provides additional spatial freedom for component arrangement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If the developing roller is continuously pressed to the photosensitive drum, then image formation can proceed, but deformation of the developing roller or photosensitive drum may occur

Engineering Contradiction:

Improvecontinuous operation capabilityVSAvoidcomponent deformation prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The pressing mechanism incorporates a swingable arm that can dynamically adjust between a pressing posture (for continuous operation) and a separated posture (for preventing deformation). This dynamic capability allows the system to alternate between pressing and releasing states, maintaining both productivity and reliability.

Inventive Principle:

Principle #15Dynamics

3Force

If a rigid pressing mechanism is used, then stable pressing force is achieved, but the mechanism cannot accommodate position adjustments

Engineering Contradiction:

Improvepressing force stabilityVSAvoidposition adjustment capability

Core Design Contradiction:

ForceVSAdaptability or versatility

Solution Approach 1:

The arm is designed to be swingable rather than fixed, allowing it to move between different postures while maintaining stable pressing force when in the pressing position. This dynamic design provides both force stability and position adaptability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The swingable arm acts as an intermediary between the pressing mechanism and the developing roller, allowing for position adjustments through swinging motion while transmitting stable pressing force when engaged in the pressing posture.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This design enhances the operational flexibility and longevity of the developing cartridge by allowing continuous use despite repetitive pressing, improves handling and manufacturing efficiency, and simplifies the replacement of components.

Implementation Method 1

a biasing spring biasing one side of the holding bodies

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a cam is provided in a state where a circumferential surface thereof contacts the other side of the holding bodies. According to a rotating position of the cam, the other of the holding bodies is pressed to one of the holding bodies

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS8897670B2Developing cartridge and process unit

Publication Date: 2014.11.25 BROTHER KOGYO KK

AI summary

A developing cartridge includes: a developing roller configured to rotate about an first axis extending in a first direction, the developing roller having a first side and a second side opposite to the first side in the first direction; a case including a first wall disposed at the first side of the developing roller and a second wall disposed at the second side of the developing roller; an arm configured to be supported by the first wall of the case and configured to swing between a first posture and a second posture about an second axis extending the first direction, the arm including a first protrusion projecting from the arm in the first direction.