Key Cutting Machine with Dual Axis Cutters and Cam Drive
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Solution Overview
Problem
Conventional key cutting machines are limited to cutting only standard keys and require multiple machines to accurately reproduce other types, such as sidewinder keys, due to their design deficiencies like increased parts, transmission friction loss, and premature disengagement of clamp members during cutting.
Innovation Solution
A key cutting machine with a moveable carriage and interchangeable clamp structure, featuring a direct drive motor and cam-driven carriage system, capable of rotating cutting members about horizontal and vertical axes to accommodate different key types, including sidewinder keys, with improved clamping and positioning mechanisms to enhance versatility and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional key cutting machines use a single cutting member design, then the machine structure remains simple, but the machine can only cut standard keys and cannot accommodate sidewinder keys or other key types
Solution Approach 1:
The patent implements a universal key cutting machine that can cut both standard keys and sidewinder keys by providing two interchangeable cutting members: a first cutting member (circular rotating saw blade) for standard keys and a second cutting member (drill bit-like cutter) for sidewinder keys. The machine includes an interchangeable clamp structure that can be configured to hold different key types, enabling a single machine to perform multiple key cutting functions that previously required separate dedicated machines.
2Loss of energy
If key cutting machines use an intermediate belt and pulley assembly to drive the cutting tool, then the motor can be positioned remotely, but the number of parts increases and transmission friction loss increases
Solution Approach 1:
The patent eliminates the intermediate belt and pulley assembly from the drive system. Instead of using a remote motor connected through transmission components, the invention positions the motor directly at the cutting tool location, enabling direct drive operation. This extraction of the transmission system removes the source of friction losses and reduces the number of moving parts, directly addressing the energy loss and complexity issues.
3Reliability
If a spring biased carriage system is used in key cutting machines, then the carriage can return to initial position automatically, but the clamp members and carriage may prematurely disengage during the final cutting portion of the key tip
Solution Approach 1:
The patent replaces the spring biased carriage system with a cam-driven carriage system. The cam mechanism provides positive mechanical control over the carriage movement, ensuring that the carriage maintains proper engagement with the key blank throughout the entire cutting stroke, including the critical final portion of the key tip. This substitution eliminates the premature disengagement problem inherent in spring-based systems while maintaining automatic return capability through the cam's mechanical design.
Data Source
AI summary
A key cutting machine is provided for cutting a key blank from a master key. The key cutting machine comprises a first cutting member that rotates about a substantially horizontal axis for cutting a key pattern on a key blank and a second cutting member that rotates about a substantially vertical axis for cutting a key pattern on a key blank. Additional improvements or features of a key cutting machine are also described.