Battery Rail Layout for Stable Swing-Arm Cutting Machines
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Solution Overview
Problem
Conventional cutting machines face difficulties in attaching and detaching the battery pack without causing the cutting portion to swing or translate, potentially damaging the workpiece when a workpiece is present.
Innovation Solution
A cutting machine design featuring a swing support mechanism with a swing shaft parallel to the output shaft and rail portions that extend perpendicularly to the cutting blade, allowing the battery pack to be attached and detached without moving the cutting portion, and incorporating the battery pack attachment portion within the motor housing to simplify the structure and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery pack attachment-detachment direction is parallel to the side surface of the circular saw blade, then the battery pack can be easily accessed, but the cutting portion swings or translates with respect to the base portion, making it difficult to attach and detach the battery pack and potentially damaging the workpiece
Solution Approach 1:
The patent inverts the conventional attachment-detachment direction from parallel to the side surface of the cutting blade to perpendicular to the side surface. This inversion changes the direction of force application during battery pack attachment/detachment, preventing the cutting portion from swinging or translating while maintaining operational ease through the perpendicular rail portions extending in the attachment-detachment direction
Solution Approach 2:
The patent introduces guide bars as intermediary components that mediate between the battery pack attachment mechanism and the cutting portion. The guide bars constrain the cutting portion's movement, allowing the battery pack to be attached and detached without causing the cutting portion to swing or translate, thus resolving the contradiction between ease of operation and stability
2Device complexity
If the battery pack attachment direction is parallel to the side surface of the cutting blade, then the structure is simpler, but the workpiece may be damaged due to cutting portion movement during battery attachment/detachment
Solution Approach 1:
The patent inverts the attachment direction to perpendicular relative to the cutting blade side surface, which initially appears to increase structural complexity but actually simplifies the overall mechanism by eliminating the need for complex locking mechanisms to prevent cutting portion movement during battery attachment/detachment, while simultaneously eliminating workpiece damage risk
Solution Approach 2:
The guide bars serve as intermediary components that prevent harmful forces from transferring to the workpiece during battery pack attachment and detachment, thereby eliminating workpiece damage risk while maintaining a relatively simple structural configuration through the perpendicular rail arrangement
3Ease of manufacture
If the battery pack attachment portion is integrated into the motor housing, then the number of components is reduced and assembly is simplified, but the motor housing structure becomes more complex
Solution Approach 1:
The patent merges the battery pack attachment portion with the motor housing, integrating what would traditionally be separate components into a unified structure. This merging reduces the total number of components and simplifies assembly procedures, as the battery pack attaches directly to the motor housing without requiring separate attachment mechanisms or additional fastening components
Solution Approach 2:
The motor housing is designed to serve multiple functions: it houses the motor, provides structural support, and incorporates the battery pack attachment mechanism. This multi-functionality eliminates the need for separate dedicated attachment structures, thereby reducing component count and simplifying assembly while the internal integration manages the structural complexity within the motor housing
Data Source
AI summary
To provide a cutting machine that suppresses swinging of the cutting portion when the battery pack is attached or detached, the cutting machine includes a cutting portion, a base, and a swing support mechanism. The cutting portion includes: a motor, a motor housing accommodating the motor, an output shaft configured to be rotated upon rotation of the motor, a battery pack serving as a power source of the motor, and a battery pack attaching portion including a pair of rail portions with which the battery pack is engageable, where a cutting blade is configured to be detachably attached to the output shaft. The base has a contact surface on which a workpiece is configured to be placed. The swing support mechanism is connected to the base and the cutting portion and includes a swing shaft extending in parallel to the output shaft. The swing support mechanism supporting the cutting portion such that the cutting portion is swingable about the swing shaft between a top dead center and a bottom dead center in a direction parallel to a side surface of the cutting blade. The pair of rail portions extend in a direction crossing the side surface of the cutting blade.