Jigsaw Ram Clamping Device for Blade Alignment
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Solution Overview
Problem
Conventional jigsaws experience unsatisfactory sawing results in terms of accuracy and reproducibility due to inadequate guidance and stabilization of the saw blade, despite existing measures to improve these aspects.
Innovation Solution
A clamping device integrated into the ram of the jigsaw, which securely clamps the saw blade using an alignment surface and a clamping element, allowing for automatic alignment and torsion-proof positioning, and utilizes a force accumulator for optimal clamping force without user intervention, enabling tool-free operation and easy saw blade exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional guidance and stabilization measures are used for the saw blade, then the saw blade is guided and stabilized, but the sawing results in terms of accuracy and reproducibility remain unsatisfactory
Solution Approach 1:
The invention extracts the clamping function from separate guidance components and integrates it directly into the ram. The clamping device is built into the ram structure itself, allowing the saw blade to be firmly clamped at the upper end of the ram while remaining completely free and unguided elsewhere, eliminating the need for external guidance mechanisms that failed to provide satisfactory results.
Solution Approach 2:
The saw blade is left completely free and unguided, allowing it to straighten itself or align itself optimally during the sawing process. This self-alignment capability exploits the natural behavior of the saw blade during the upward stroke, where the ram pulls the saw blade through the workpiece and the blade automatically corrects its own position.
2Ease of operation
If the saw blade is left completely free and unguided, then the saw blade can straighten itself, but the saw blade requires firm clamping on the ram to achieve this effect
Solution Approach 1:
The clamping device is merged with the ram structure, forming an integrated unit. The clamping element, alignment surface, and energy store are all integrated into the ram, ensuring that the saw blade is firmly clamped at the upper end of the ram while maintaining the ability to self-align during operation.
3Ease of operation
If an adjustment movement parallel to the ram axis is converted into a clamping movement perpendicular to the ram axis, then the clamping operation becomes simple, but a force accumulator is required
Solution Approach 1:
The invention changes the dimension of the clamping force application by converting an adjustment movement parallel to the ram axis into a clamping movement perpendicular to the ram axis. The clamping element is designed with a control surface that redirects the axial adjustment movement into a perpendicular clamping action, allowing simple operation while effectively utilizing the energy store.
4Manufacturing precision
If the clamping device is integrated into the ram, then optimum firm connection is guaranteed, but the device structure becomes more complex
Solution Approach 1:
The clamping device is merged with the ram structure, forming an integrated unit. The clamping element, alignment surface, and energy store are all integrated into the ram, ensuring that the saw blade is firmly clamped at the upper end of the ram while maintaining the ability to self-align during operation.
Solution Approach 2:
The integrated clamping device performs multiple functions: it provides firm clamping of the saw blade, ensures precise alignment through the alignment surface, stores energy for automatic clamping, and allows for simple operation through the adjustment movement. This multi-functionality reduces the need for separate components and simplifies the overall device structure.
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 solution results in improved sawing accuracy and reduced saw blade wear, eliminating the need for direct guides or stabilizers, and allows for the use of thinner saw blades, enhancing overall sawing performance and user convenience.
Implementation Method 1
The convertibility of an adjusting movement occurring at least partially parallel to the ram axis into a clamping movement of the clamping element perpendicular to the ram axis makes it possible for the user to operate the clamping device in a particularly simple manner. When the saw blade is clamped, the clamping element is acted upon by a force accumulator, in particular a spring, with a clamping force acting in the direction of the adjusting movement.
Data Source
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AI summary
The saw has a clamping device (21) integrated in a pushrod (13) and fixedly clamping a saw blade (11) to the pushrod. The pushrod liftingly moves the blade along a pushrod axis (S). The device includes an alignment surface (23) for a sidewall of the blade and a clamping element (27). Adjusting movement (E) of the clamping element is converted into clamping movement (A) of the clamping element in direction of the alignment surface. The clamping element is loaded with clamping force acting in direction of the adjusting movement by the blade using an energy storage (39) i.e. spiral spring.