Hand Tool Holder Positioning via Spindle Stop and Sensor Feedback
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Solution Overview
Problem
Conventional hand machine tools, such as jigsaws and eccentric sanders, lack a reliable mechanism to stop the tool holder at a precise position for tool changes, transportation, and parking, leading to difficulties in operation and storage due to protruding tools and inefficient space usage.
Innovation Solution
The hand machine tool incorporates a stop position mechanism that allows the tool holder to be blocked and adjusted for tool changes, transportation, and parking, using a spindle stop and actuating device, with position detection via sensors and control devices to ensure precise stopping, enabling the tool holder to be securely locked in place for these purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tool holder is allowed to move freely for operation, then the tool can reach workpieces effectively, but the tool holder cannot be securely positioned for tool changes or storage
Solution Approach 1:
The patent implements a spindle stop mechanism that automatically positions the tool holder at predetermined locations (such as a retracted position) before tool changes or storage operations. This preliminary positioning action ensures the tool holder is securely located in advance, providing stability for tool changes while maintaining operational flexibility during cutting cycles.
2Productivity
If the tool protrudes from the housing for effective cutting, then cutting performance is improved, but the hand machine tool occupies more space during transportation and storage
Solution Approach 1:
The patent employs a dynamically adjustable tool holder that can change its position along the longitudinal axis. During cutting operations, the tool holder extends to provide adequate cutting performance. During transportation and storage, the tool holder automatically or manually retracts to a compact position, minimizing the overall volume of the hand machine tool and optimizing space utilization.
3Device complexity
If manual adjustment mechanisms are used for tool holder positioning, then device complexity is reduced, but positioning precision and repeatability are insufficient
Solution Approach 1:
The patent replaces purely manual mechanical adjustment mechanisms with an automated positioning system that uses sensors (such as Hall sensors or optical encoders) to detect the tool holder position and a control unit to actuate the spindle stop mechanism. This substitution maintains relatively simple mechanical components while dramatically improving positioning precision and repeatability through electronic control and feedback.
Data Source
Figure 1~2
Figure 3~5
Figure 6a~7b
AI summary
The tool (10a) has a drive (22a) including a motor (11a) for driving a tool holder (14a) to an oscillation movement (21) and/or a rotation movement relative to a housing (28a). A control device controls the drive. A position detection unit detects a position signal based on a position of the holder. The control device stops the motor at a preset or adjustable stop-position (AP) i.e. tool exchange-position, of the holder based on the position signal. A balancing weight is connected with the holder and arranged against an eccentric position of a tool (15a) e.g. saw blade.