Saber Saw Guide Yoke Decoupling Rotary and Lifting Motion
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Solution Overview
Problem
Machine tools like jigsaws face challenges in achieving compact design with lifting and rotary capabilities while maintaining precise and stable guidance of the saw blade, as existing configurations result in play between guide links and undesired drive influences.
Innovation Solution
The use of a guide yoke supported on the housing, which allows the link body to be offset and decoupled from the saw blade, enabling rotation without affecting the lifting drive, and a pivot bolt for rotational mobility, along with a sliding guide for non-circular cross-sections, facilitates access and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the guide link is integrated with the crank mechanism on the housing side, then the structure is compact, but play occurs between the guide link and crank pin, reducing guidance precision
Solution Approach 1:
The patent divides the guide system into separate components: the guide yoke (Lenker) and the crank mechanism are separated and independently supported on the housing. This segmentation eliminates the play between integrated parts while maintaining compact overall structure through independent mounting positions.
2Device complexity
If the saw blade is directly guided by the crank mechanism, then the lifting drive is simple, but rotation of the saw blade creates undesired drive influences and repercussions on the lifting mechanism
Solution Approach 1:
The guide yoke serves as an intermediary component between the crank mechanism and the saw blade. It is rotatably connected to the crank pin and guides the lifting rod, thereby mediating the rotational movements and preventing them from directly influencing the lifting drive mechanism.
Solution Approach 2:
The guide yoke is extracted as a separate, independently supported component from the crank mechanism. This allows the guide yoke to handle rotational guidance while the crank mechanism focuses solely on the lifting function, eliminating cross-influences between the two functions.
3Volume of moving object
If the guide structure is integrated close to the saw blade, then the design is compact, but access for rotary adjustment of the working tool is limited
Solution Approach 1:
The guide yoke is offset in level with the saw blade along the lifting direction, creating a spatial separation in the vertical dimension. This allows the rotary adjustment mechanism to access the guide yoke from the side or top, improving accessibility while maintaining compact horizontal footprint.
Data Source
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AI summary
A machine tool (2) designed as a sabre saw (3) driven by an electric motor comprises a support of the saw blade (4) that can be rotated about the lifting axis (15) thereof against a guide yoke (17) guided in a slidable manner in the lifting direction, said yoke carrying the slot body (12) of a Scotch yoke drive mechanism (8) that comprises the guide slot (11), by means of which drive mechanism the lifting drive of the saw blade (4) is carried out.