Medical Monitor Printer Mechanism With Curved Guide Slot Pressure Control
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Solution Overview
Problem
Existing medical monitoring devices face issues with poor printing quality due to changes in compression force between the rubber platen and printing head caused by spring elasticity, and the springs occupy significant space, leading to inefficient use of device space.
Innovation Solution
A printing mechanism with a support plate, L-shaped support arm, movable frame assembly, and guide slots with curved contours to ensure precise alignment and pressure between the printing head and rubber platen, using a driving mechanism with an electric motor and pulleys to maintain consistent compression force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If springs are used to press the printing head down, then the printing head can be held with compression force, but the springs occupy large space and their elasticity changes over time causing poor printing quality
Solution Approach 1:
The patent removes the springs from the system entirely and replaces them with a guide slot mechanism. The guide pin moving along the curved guide slot provides the necessary compression force through geometric constraint rather than elastic deformation, eliminating the space-consuming springs while maintaining reliable printing pressure.
Solution Approach 2:
The guide slot is designed with a curved contour that provides the compression force needed for printing. The curvature of the guide slot replaces the elastic function of springs, allowing the printing head to be pressed against the rubber platen with consistent force without requiring elastic components.
2Force
If springs are used to provide compression force between printing head and rubber platen, then printing pressure is maintained, but the compression force changes as spring elasticity degrades leading to poor printing quality
Solution Approach 1:
The curved guide slot provides a geometrically determined compression force that remains constant throughout operation. Unlike springs whose force varies with elasticity degradation, the curved path of the guide pin ensures consistent vertical displacement and thus consistent printing pressure over time.
Solution Approach 2:
The patent replaces the elastic mechanical system (springs) with a geometric constraint system (curved guide slot). This substitution eliminates the degradation issue inherent in elastic materials while maintaining the necessary compression force through pure geometric design.
3Manufacturing precision
If the rubber platen and printing head are pressed together at appropriate pressure, then accurate printing is achieved, but the structure becomes complex with multiple components
Solution Approach 1:
The patent combines the support structure and compression force provision into a single integrated guide slot component. Rather than having separate support arms and compression mechanisms, the curved guide slot simultaneously provides both functions, simplifying the overall structure while maintaining printing accuracy.
Solution Approach 2:
The guide slot serves multiple functions: it guides the printing head movement, provides compression force through its curvature, and ensures accurate positioning. This multi-functionality reduces the number of separate components needed while maintaining the required printing precision.
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
Achieves improved printing quality by maintaining consistent pressure and reducing space occupation, allowing for a compact and efficient layout within the medical monitoring device.
Implementation Method 1
a guide pin extending from both sides of the printing head mounting portion is movably received in the respective guide slot to limit a relative position and a compression force between the printing head and the rubber platen
Implementation Method 2
a rubber platen driven by a stepper motor rotates at a preset speed to drag a print paper past a thermal printing head
Data Source
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AI summary
The present invention provides a printing mechanism for a medical monitoring device and a medical monitoring device. The printing mechanism comprises a support plate, a L-shaped support arm rotatably disposed on the support plate at one end, the support arm provided with a printing head mounting portion at the other end, the printing head mounting portion provided with a printing head thereon, and a movable frame assembly movably disposed on the support plate and between the support plate and the support arm, the movable frame assembly comprising a frame, a rubber platen mounted at a front end of the frame adjacent to the outside of the medical monitoring device to be in contact with the printing head under pressure, a print paper drawer mounted on the frame, and a driving mechanism mounted on the frame to drive the rubber platen to rotate, wherein the frame is formed with a guide slot having a curved contour therein, and a guide pin extending from both sides of the printing head mounting portion is movably received in the respective guide slot to limit a relative position and a compression force between the printing head and the rubber platen. The printing mechanism for the medical monitoring device according to the present invention may ensure excellent printing quality and does not occupy too much space.