ADF Drive Transmission Layout With Shared Heat Shielding

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Solution Overview

Problem

Existing drive transmission devices in automatic document feeders (ADFs) face challenges in efficiently managing heat transfer from motors to drive transmission mechanisms, leading to increased costs due to the need for individual heat-resistant covers for each motor, which complicates manufacturing and assembly.

Innovation Solution

The drive transmission device positions multiple motors at the same height and on the same side, shielding them with a single or fewer heat-resistant members that cover the drive transmission mechanisms, preventing heat transfer by locating the heat-resistant member above the motors, thereby simplifying the design and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If individual heat-resistant covers are provided for each motor, then heat transfer prevention is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveheat transferVSAvoidstructure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Multiple separate heat-resistant covers for individual motors are merged into a single integrated heat-resistant member that shields multiple motors simultaneously. This reduces the number of parts from multiple individual covers to one unified structure, simplifying assembly and reducing manufacturing complexity while maintaining effective heat transfer prevention for all motors.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The heat-resistant member is designed with multi-functionality to serve multiple motors at once. Instead of each motor having its own dedicated cover, a single heat-resistant structure performs the protective function for multiple motors, making the system more efficient and reducing overall component count.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If individual heat-resistant covers are provided for each motor, then heat transfer prevention is improved, but manufacturing and assembly cost increase

Engineering Contradiction:

Improveheat transferVSAvoidmanufacturing cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The design eliminates redundant individual covers for each motor, discarding the unnecessary multiplicity of parts. By recovering the essential protective function through a single shared heat-resistant member, the system achieves the same heat prevention capability with reduced material usage and lower manufacturing costs.

Inventive Principle:

Principle #34Discarding and recovering

3Adaptability or versatility

If motors are positioned at different heights, then spatial arrangement flexibility is improved, but heat-resistant member design complexity increases

Engineering Contradiction:

Improvespatial arrangementVSAvoidheat-resistant member design

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The motors are intentionally positioned at the same height rather than distributing them at different heights, creating a symmetric arrangement. This asymmetric design choice (uniform positioning rather than varied positioning) simplifies the heat-resistant member design by providing a consistent shielding target, while still allowing spatial flexibility through the shared cover approach.

Inventive Principle:

Principle #4Asymmetry

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 configuration effectively prevents heat transfer to the drive transmission mechanisms, reducing manufacturing and assembly costs while maintaining efficient operation of the ADF components.

Implementation Method 1

The at least two drive transmission mechanisms are shielded from the at least two drive sources by the heat-resistant member at the position

Methodology Applied

Scientific EffectThermal radiation blocking: Thermal Radiation

Implementation Method 2

heat-resistant member... preventing heat transfer by locating the heat-resistant member above the motors

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS12541167B2Drive transmission device, image reading device, and image forming apparatus

Publication Date: 2026.02.03 RICOH CO LTD

AI summary

A drive transmission device includes a plurality of drive transmission units and a heat-resistant member. The drive transmission units include a plurality of drive transmission mechanisms to transmit drive force from a plurality of drive sources to a driven member. At least two drive sources of the drive sources are included in at least two drive transmission units of the drive transmission units. The at least two drive sources are disposed at substantially a same height and on a same side with respect to at least two drive transmission mechanisms of the drive transmission mechanisms that correspond to the at least two drive sources. The heat-resistant member is disposed at a position higher than the at least two drive sources in a use state. The at least two drive transmission mechanisms are shielded from the at least two drive sources by the heat-resistant member at the position.