External Driver Mounting for Compact Image-Forming Housings

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Solution Overview

Problem

Existing image forming apparatus designs face challenges in efficiently arranging components due to limited space, leading to increased size and restricted component arrangement, particularly when the driver is positioned directly on the rear plate, which occupies valuable space and restricts the placement of other mechanisms.

Innovation Solution

The image forming apparatus is redesigned with a rear plate shifted inward, allowing the driver to be coupled to a bracket supported by the rear plate, creating larger component arrangement spaces and enabling the placement of additional units by utilizing the space behind the driver and within the bracket, which is fixed using support shafts for precise positioning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the driver is positioned directly on the rear plate, then the driving force transmission is direct and simple, but the component arrangement space is reduced and the overall apparatus size increases

Engineering Contradiction:
Improvedriver mounting structureVSAvoidcomponent arrangement space
Core Design Contradiction:
Device complexityVSArea of stationary object

Solution Approach 1:

The driver mounting structure is segmented into a bracket and support shafts, separating the driver from direct mounting on the rear plate. This segmentation creates distinct functional zones: the bracket provides mounting functionality while the support shafts provide positioning, thereby freeing up space within the housing for other components.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

A bracket acts as an intermediary element between the driver and the rear plate. The bracket is fixed to the rear plate via support shafts, creating a intermediate mounting structure that allows the driver to be positioned without directly occupying the space behind it, thus serving as a mediator that resolves the space conflict.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the rear plate is shifted inward to create space, then the component arrangement flexibility is improved, but the structural stability may be compromised

Engineering Contradiction:
Improvecomponent arrangement flexibilityVSAvoidhousing structure stability
Core Design Contradiction:
Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The support structure is segmented into multiple support shafts distributed at different positions on the rear plate. This segmentation provides multiple attachment points that maintain structural stability even when the rear plate is shifted inward, as the distributed support shafts create a stable triangular or polygonal support base.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The support shafts are positioned at specific locations on the rear plate where structural strength is concentrated. By localizing the support function to these specific positions rather than requiring uniform distribution, the design maintains stability while allowing inward shifting of the rear plate for component arrangement flexibility.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS12416890B2Image forming apparatus including a housing and drive unit and a driver disposed outside the housing
Publication Date: 2025.09.16 RICOH CO LTD
  • US12416890B2 patent drawing
  • US12416890B2 patent drawing
  • US12416890B2 patent drawing

AI summary

An image forming apparatus includes a housing, a driven unit, and a driver. The housing includes a pair of plates facing each other. The pair of plates includes a front plate and a rear plate facing the front plate and having an opening. The driven unit is supported by the pair of plates and has one end projecting outside the housing from the opening of the rear plate. The driver is disposed outside the housing and coupled to said one end of the driven unit to drive the driven unit. The driver includes a body separated from an outer face of the rear plate.