Cutting Length Limiting Device for Portable Tools
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Solution Overview
Problem
Existing cutting length limiting devices for portable machine tools lack precision in maintaining a desired cutting length, especially when the cutting depth changes, and often require visual control, which can be inconvenient and imprecise.
Innovation Solution
A cutting length limiting device with a setting unit that adjusts the position of a stop element based on a set cutting depth, using a coupling element with a positive or non-positive connection to a guide unit, and includes a clamping unit for secure fixation, allowing for precise adjustment of the cutting length without visual control through tactile and acoustic feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a stop element is attached to a positive guide unit to limit cutting length, then the cutting length can be limited, but the precision in maintaining the desired cutting length deteriorates when cutting depth changes
Solution Approach 1:
The stop element's position is made dynamically adjustable through the setting unit, which allows the operator to reposition the stop element based on the desired cutting depth. This dynamic adjustment capability ensures that the cutting length precision is maintained across different cutting depths, resolving the contradiction between precision and adaptability.
Solution Approach 2:
The setting unit enables changing the positional parameter of the stop element to correspond to different cutting depths. By adjusting the stop element's position parameter according to the cutting depth parameter, the system maintains precise cutting length control while adapting to various cutting depth requirements.
2Measurement precision
If visual control is used to maintain desired cutting length, then the cutting length can be monitored, but the convenience and precision of operation deteriorate
Solution Approach 1:
The stop element provides tactile feedback to the operator when the cutting reaches the predetermined length. This feedback mechanism eliminates the need for continuous visual monitoring, allowing the operator to maintain precise cutting length control through tactile sensation alone, thereby improving ease of operation while preserving measurement precision.
Solution Approach 2:
The stop element automatically signals the operator when the cutting length is reached, without requiring active visual inspection. The system serves itself by providing inherent tactile feedback, freeing the operator from the burden of visual control and improving operational convenience while maintaining precision.
3Device complexity
If the stop element position is fixed, then the device structure is simple, but the ability to adjust cutting length based on cutting depth changes deteriorates
Solution Approach 1:
The setting unit introduces a controlled dynamic element that allows the stop element position to be adjusted according to cutting depth requirements. This minimal dynamic component enables adaptability without significantly increasing overall device complexity, as the adjustment mechanism is integrated into the existing stop unit structure.
Solution Approach 2:
The setting unit serves multiple functions: it adjusts the stop element position, corresponds to different cutting depths, and maintains cutting length precision. By consolidating these functions into a single integrated unit, the device achieves high adaptability without proportionally increasing complexity, as the same structural elements perform multiple roles.
Data Source
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AI summary
The invention relates to a device for limiting the length of a cut, to be used in portable machine tools (12), and comprising at least one stop unit (14) that has at least one stop element (18) which can be fixed to a force-feed unit (16). It is suggested that at least one adjustment unit (20) is provided to adjust a stop element (18) position which corresponds to a desired length of a cut, in accordance with a cut depth (T) that has been set.