Bidirectional Cam Mechanism for Printer Cutting Load Stability
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Solution Overview
Problem
The existing cutting device for printers experiences an increased driving load during the half-cutting action, which can lead to inefficiencies and potential malfunctions due to the differing transmission rates of driving force between the full-cutting and half-cutting assemblies.
Innovation Solution
The cutting device is designed with a cam mechanism that has a shorter distance between the cam face and the half-cutting arm compared to the full-cutting arm, allowing for a greater transmission rate of driving force to the half-cutting assembly, thereby reducing the maximum driving load on the cam and stabilizing the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between the cam face and the second arm (half-cutting assembly) is made smaller to increase transmission rate, then the driving load on the cam increases, but this causes instability and potential malfunction
Solution Approach 1:
The patent changes the geometric parameters of the cam mechanism by making the distance between the cam face and the second arm smaller than or equal to the distance between the cam face and the first arm. This parameter change increases the transmission rate of driving force to the half-cutting assembly while the cam structure is designed to maintain stable driving load through its rotational mechanics about the third shaft
2Adaptability or versatility
If the cam plate rotates bidirectionally to enable both full-cutting and half-cutting actions, then the device becomes more versatile, but the driving load on the cam increases during half-cutting action
Solution Approach 1:
The cam mechanism is designed to perform multiple functions by rotating bidirectionally. When rotating normally, it drives the first arm for full-cutting action; when rotating reversely, it drives the second arm for half-cutting action. The cam face geometry with two pressing parts enables this multi-functionality while controlling the driving load through the cam's rotational mechanics
Solution Approach 2:
The patent uses parameter changes in the cam face geometry, where the distance to the second arm is smaller than or equal to the distance to the first arm. This creates different transmission characteristics for the two cutting modes, allowing the cam to handle the increased driving load during half-cutting action while maintaining versatility
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 design ensures reliable and efficient half-cutting operations by maintaining a stable driving load on the cam, preventing excessive stress and ensuring consistent performance across both full-cutting and half-cutting actions.
Implementation Method 1
The cam is configured to rotate bidirectionally normally and reversely in directions opposite to each other about a third shaft. The cam has a cam face, on which a first pressing part configured to press the first arm to rotate about the first shaft when the cam rotates normally and a second pressing part configured to press the second arm to rotate about the second shaft when the cam rotates reversely are arranged.
Data Source
AI summary
A cutting device, having a full-cutting assembly, a half-cutting assembly, and a cam, is provided. The full-cutting assembly includes a first cutting blade and a facing part to cut a tape fully through in a direction of thickness of the tape by rotating a first arm about a first shaft. The half-cutting assembly includes a second cutting blade and a supporting base to cut the tape partly in the direction of thickness by rotating a second arm about a second shaft. The cam is rotatable bidirectionally about a third shaft and has a cam face, on which a first pressing part to press the first arm and a second pressing part to press the second arm are arranged. A distance between the cam face and the second arm is smaller than or equal to a distance between the cam face and the first arm.