Engraving Tool Holder Projection Positioning
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Solution Overview
Problem
Existing engraving tools for gravure cylinders face challenges such as frequent diamond stylus replacement due to breakage or wear, requiring realignment of the new tool, and issues with dirt or metal chips entering the receiving opening, leading to inaccurate stylus positioning and increased manufacturing complexity.
Innovation Solution
An engraving tool with a trapezoidal base body and a protruding projection that strikes a stop surface on the tool holder, allowing for precise longitudinal positioning without realignment, combined with a clamping mechanism and a trapezoidal receiving opening in the tool holder for secure seating and easy cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a boundary wall is formed at the rear end of the receiving opening to serve as a stop for longitudinal positioning of the engraving tool, then the diamond stylus protrudes by a predetermined amount beyond the front or working side of the tool holder, but small metal chips or dirt particles can get into the receiving opening between the boundary wall and the base body, leading to inaccurate stylus positioning
Solution Approach 1:
The invention extracts the harmful space (gap between boundary wall and base body) by introducing a filling element that occupies this space. The filling element is inserted into the receiving opening to prevent metal chips and dirt particles from entering the gap between the boundary wall and the base body of the engraving tool, thereby eliminating the contamination source while preserving the longitudinal positioning function.
Solution Approach 2:
The filling element acts as an intermediary component between the boundary wall and the base body of the engraving tool. It fills the gap space without interfering with the longitudinal positioning function, preventing contamination while allowing the stop function to operate effectively.
2Manufacturing precision
If the receiving opening is partially closed at its rear front end by a boundary wall to ensure precise positioning, then the diamond stylus position is accurately controlled, but the receiving opening cannot be produced by drilling and must be given its shape by spark erosion with slower and less efficient processes
Solution Approach 1:
The invention segments the receiving opening into two functional parts: a front portion that maintains the precise trapezoidal shape for positioning (produced by spark erosion) and a rear portion that can be produced by drilling. This segmentation allows different manufacturing methods to be applied to different sections, combining the advantages of both approaches.
Solution Approach 2:
The invention applies local quality by providing the filling element only in the rear portion of the receiving opening where drilling is used, while maintaining the precise trapezoidal shape in the front portion through spark erosion. This allows the critical positioning area to have high precision while the non-critical area uses simpler manufacturing.
3Strength
If a continuous fine-threaded bore is used in the tool holder for securing the engraving tool, then the tool can be held securely, but there is play between the thread hole and external thread that affects the accuracy of stylus movement
Solution Approach 1:
The invention replaces the symmetric threaded connection with an asymmetric interference fit connection. The polygonal cross-section of the engraving tool base body fits into the corresponding polygonal receiving opening, creating an asymmetric geometric interlock that eliminates play while maintaining secure holding.
4Strength
If the base body has a constant trapezoidal cross section with a receiving opening that is not completely filled by the main body, then the tool can be clamped securely, but dirt or metal chips can enter the gap between the boundary wall and base body, requiring frequent tool replacement and realignment
Solution Approach 1:
The invention extracts the harmful space (gap between boundary wall and base body) by introducing a filling element that occupies this space. This prevents metal chips and dirt particles from entering the gap, eliminating the source of positioning inconsistency while preserving the secure clamping function.
Data Source
Figure 1~2
Figure 3~6
AI summary
The tool (4) has a metallic base body (6) including a rear side opposing a front or working side. The base body includes a constant cross section between the front or working side and the rear side on a part of length, where the cross section is limited by lateral surfaces. A diamond-tipped tool (10) is provided on the front or working side and is inserted into a slot-like opening (8) of the base body. A projection (54) is provided on one of the lateral surfaces adjacent to the front or working side. The projection includes an abutment surface at a rear side. An independent claim is also included for a tool holder for an engraving tool for engraving a gravure cylinder.