Thermal Printer Clutch Mechanism Impact Force Reduction
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Solution Overview
Problem
The impact force generated by falling printing paper sheets affects the quality of printing in thermal printers, causing sloshing and deflection between the platen roller and thermal head, leading to poor printing quality.
Innovation Solution
A clutch mechanism is introduced, comprising a driving member and a driven member, where the driving member is not directly supported by the pickup roller mounting frame, and the driven member is fixedly sleeved on the rotation shaft of the pickup roller, allowing for reduced transmission of impact forces to the platen roller, thereby minimizing sloshing and improving printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pickup roller is directly supported by the pickup roller mounting frame, then the structure is simple and easy to manufacture, but the impact force from falling paper sheets is transmitted to the platen roller causing printing quality degradation
Solution Approach 1:
The support structure is segmented into two independent parts: the pickup roller mounting frame and the driving member support. The driving member is supported by a separate location rather than being directly mounted to the pickup roller mounting frame, creating structural segmentation that interrupts the impact force transmission path from the pickup roller to the platen roller through the gear set.
Solution Approach 2:
The driving member is extracted from the pickup roller mounting frame support structure and supported by a separate location. This extraction removes the driving member from the impact force transmission path, preventing the force from reaching the platen roller while maintaining the functional connection between the driving member and pickup roller.
2Device complexity
If the driving member is directly supported by the pickup roller mounting frame, then the device complexity is reduced, but impact force transmission causes sloshing and deflection during printing
Solution Approach 1:
The support system is segmented into two independent support locations: one for the pickup roller on the mounting frame and another for the driving member on a separate location. This segmentation creates independent support paths that prevent coupled vibrations and maintain printing stability by isolating the driving member from impact-induced sloshing.
Solution Approach 2:
A separate support location is introduced as an intermediary between the driving member and the pickup roller mounting frame. This intermediary support structure interrupts the direct transmission path of impact forces, preventing the sloshing and deflection that would otherwise occur during the printing process.
3Device complexity
If the driving member is supported by the pickup roller mounting frame, then the gear set transmission is simplified, but the impact force affects the platen roller and reduces printing quality
Solution Approach 1:
The driving member is extracted from the pickup roller mounting frame support structure and supported by a separate location. This extraction removes the driving member from the impact force transmission path through the gear set, preventing force transmission to the platen roller while maintaining the functional gear set transmission between the driving member and pickup roller.
Solution Approach 2:
A separate support location serves as an intermediary that decouples the driving member from the pickup roller mounting frame. This intermediary support structure maintains the gear set transmission function while interrupting the impact force transmission path, thereby protecting printing quality.
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
The clutch mechanism effectively reduces the impact force transmitted to the platen roller, preventing shaking and improving printing quality by allowing the driving portion to part from the driven member, thus avoiding instantaneous momentum transfer and ensuring smooth paper feeding.
Implementation Method 1
the clutch mechanism effectively reduces the impact force transmitted to the platen roller, preventing shaking and improving printing quality by allowing the driving portion to part from the driven member, thus avoiding instantaneous momentum transfer
Implementation Method 2
The printing paper sheets can be fed due to the friction between the printing paper sheets and the circumferential surface of the pickup roller
Data Source
AI summary
A thermal printer comprises a base part, a platen roller and a thermal head oppositely arranged, a pickup roller, and a gear set connecting the platen roller and the pickup roller. The base part is provided with a printing paper accommodating cavity and a pickup roller mounting frame, a plurality of printing paper sheets are disposed in the printing paper accommodating cavity, and a clutch mechanism is further provided. The clutch mechanism comprises a driving portion driven by the gear set and a driven portion for driving the pickup roller to rotate. The driving portion is disposed outside the pickup roller mounting frame, such that the impact force, which is generated by the remaining printing paper sheet that falls down when the printing paper sheet departs from the pickup roller and which is transmitted to the platen roller, can be reduced. The thermal printer is capable of providing smooth printing.