Torsion Spring Engagement Stability in Image Forming Drive Units
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Solution Overview
Problem
The existing image forming apparatuses face issues where the torsion spring can disengage from the protrusion during assembly, leading to potential mechanical failures and operational disruptions.
Innovation Solution
The apparatus incorporates a design with a pivotable first arm and a covering portion that extends to cover the distal end of the protrusion, ensuring the torsion spring remains engaged and preventing disengagement, thereby stabilizing the drive unit's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the torsion spring is attached to the frame with the spiral portion engaged with the protrusion, then the drive unit can be assembled, but the spiral portion may disengage from the protrusion during assembly
Solution Approach 1:
The covering portion acts as an intermediary element between the torsion spring and the protrusion. It guides the spiral portion onto the protrusion during assembly and maintains engagement by covering the distal end, preventing disengagement while allowing straightforward assembly.
Solution Approach 2:
The covering portion is positioned in advance to cover the distal end of the protrusion before the spiral portion is fully engaged. This preliminary positioning ensures that the spiral portion remains engaged during the assembly process and prevents disengagement.
2Device complexity
If the protrusion extends without coverage, then the structure remains simple, but the torsion spring may disengage from the protrusion
Solution Approach 1:
The covering portion serves as a simple intermediary structure that adds minimal complexity while effectively preventing disengagement. It covers the distal end of the protrusion to retain the spiral portion without requiring complex retention mechanisms.
3Reliability
If the covering portion is added to cover the distal end of the protrusion, then disengagement is prevented, but the device complexity increases
Solution Approach 1:
The covering portion serves multiple functions: it guides the spiral portion onto the protrusion during assembly, covers the distal end to prevent disengagement, and maintains engagement stability. This multi-functionality justifies the added structural element.
Solution Approach 2:
The covering portion is a simple intermediary structure that provides engagement stability without requiring complex retention mechanisms, achieving reliable prevention of disengagement with minimal added complexity.
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 reduces or prevents the torsion spring from disengaging from the protrusion, enhancing the assembly reliability and operational stability of the image forming apparatus by maintaining the drive unit's integrity.
Implementation Method 1
a torsion spring that exerts an urging force on one of the gears
Implementation Method 2
The torsion spring includes a spiral portion engaged with the protrusion
Data Source
AI summary
An image forming apparatus includes a drive unit disposed inside its housing, a support frame, a protrusion, and a support portion. The drive unit is configured to drive a conveyance unit for conveying a sheet toward an image forming unit. The support frame supports the drive unit. The protrusion has a proximal end and a distal end. The distal end is farther from the support frame than the proximal end is from the support frame. The support portion supports the proximal end of the protrusion. The drive unit further includes a torsion spring including a spiral portion engaged with the protrusion, and a first portion and a second portion each extending from the spiral portion. The first arm is pivotable about a pivot axis and includes a covering portion. The covering portion extends from the first arm and covers the distal end of the protrusion.