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 cross the side surface of the cutting blade, allowing the battery pack to be attached and detached without moving the cutting portion, and incorporating a motor housing with split pieces for simplified assembly and reduced component count.
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 introduces a swing support mechanism as an intermediary component between the cutting portion and the base portion. This mechanism includes a swing shaft that allows controlled swinging motion while preventing unwanted translation. The swing support mechanism mediates the interaction between the battery pack attachment operation and the cutting portion stability, enabling easy battery pack access while preventing workpiece damage through controlled movement.
2Manufacturing precision
If the cutting portion is made swingable about a swing shaft parallel to the output shaft, then the cutting portion can be positioned accurately for cutting operations, but the cutting portion may still move during battery pack attachment or detachment
Solution Approach 1:
The patent employs dynamic control of the cutting portion's movement capabilities. The swing support mechanism enables swinging motion for positioning while the guide bars and rail structure provide dynamic constraints that prevent translation during battery pack operations. The system transitions between different degrees of freedom: allowing swing for positioning, then constraining translation during battery attachment/detachment, achieving both positioning accuracy and operational stability.
3Ease of manufacture
If the motor housing is constituted by at least two split pieces, then the assembly process is simplified and the machine is downsized, but the structural integrity and precision of the motor housing may be compromised
Solution Approach 1:
The motor housing is divided into at least two split pieces with mating surfaces, allowing separate manufacturing and assembly. This segmentation enables easier manufacturing and assembly processes while maintaining structural integrity through precision-machined mating surfaces that ensure proper alignment and mechanical strength when the pieces are joined together.
Data Source
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AI summary
A cutting machine comprising: a cutting portion (4) comprising: a motor (6); a motor housing (50; 150) accommodating the motor (6) therein; an output shaft (7) configured to be rotated upon rotation of the motor (6), a cutting blade (8) being configured to be detachably attached to the output shaft (7); a battery pack (9) serving as a power source of the motor (6); and a battery pack attaching portion (10) including a pair of rail portions (51B, 52B) with which the battery pack (9) is engageable; a base (2) having a contact surface (25) suitable for a workpiece (W) to be placed thereon; and a swing support mechanism (3) connected to the base (2) and the cutting portion (4) and including a swing shaft (35A) extending in parallel to the output shaft (7), the swing support mechanism (3) supporting the cutting portion (4) such that the cutting portion (4) is swingable about the swing shaft (35A) between a top dead center and a bottom dead center in a direction parallel to a side surface of the cutting blade (8), wherein the pair of rail portions (51B, 52B) extend in a direction crossing the side surface of the cutting blade (8).