Rotary Microtome Crank Pin Adjustment Mechanism
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Solution Overview
Problem
Rotary microtomes are limited in their ability to handle samples of different sizes, requiring multiple machines or compromising on section quality or time due to fixed stroke lengths, which can lead to vibration and quality issues during cutting.
Innovation Solution
A rotary microtome with a crank drive mechanism that adjusts the stroke length by varying the position of the crank pin relative to the crankshaft, allowing for stepwise or stepless adjustments, enabling flexible use with various sample sizes through a rotatable adjustment base and compensation weights to maintain balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stroke length is fixed in rotary microtomes, then the cutting speed is optimized for a specific sample size, but the machine cannot handle samples of different sizes efficiently
Solution Approach 1:
The patent makes the previously fixed stroke length adjustable by introducing a mechanism that allows the crank pin position to be changed relative to the crankshaft. This dynamic adjustment capability enables the microtome to adapt to different sample sizes while maintaining optimized cutting performance, directly resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The patent changes the parameter of stroke length from a fixed value to an adjustable variable. By providing means to adjust the distance between the crank pin and crankshaft center, the system can optimize cutting parameters for different sample sizes, thereby improving versatility without significantly increasing complexity.
2Adaptability or versatility
If a larger stroke is used to accommodate larger samples, then all samples can be processed, but smaller samples experience unnecessary traverse paths causing vibration and quality loss
Solution Approach 1:
The patent applies local quality by optimizing the stroke length specifically for each sample size category. Instead of using a universally large stroke that causes vibration for small samples, the system allows adjustment of the stroke to match the actual sample dimensions, ensuring optimal cutting quality for each local condition.
Solution Approach 2:
By making the stroke length dynamically adjustable, the system can adapt the traverse path length to match the sample size being processed. This prevents unnecessary movement for small samples, reducing vibration and maintaining high section quality while still accommodating larger samples when needed.
3Adaptability or versatility
If the crank pin position is fixed, then the mechanism is simple, but the microtome requires multiple machines or compromises quality for different sample sizes
Solution Approach 1:
The patent introduces dynamic adjustability to the crank pin position, allowing it to be moved to different locations relative to the crankshaft. This single adjustment mechanism provides versatility for handling different sample categories, replacing the need for multiple fixed-stroke machines while adding only moderate complexity to the overall system.
Solution Approach 2:
The adjustable crank mechanism serves multiple functions: it can be configured for different stroke lengths to handle various sample sizes, making a single microtome universally applicable to different sample categories. This multi-functionality eliminates the need for multiple specialized machines while adding acceptable complexity to the drive mechanism.
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
Enables efficient and precise cutting of samples of different sizes without compromising quality, reducing the need for multiple machines and minimizing vibration, thus improving operational efficiency and section quality.
Implementation Method 1
a drive mechanism which converts a rotary movement into a lifting movement for the object, with means for adjusting the length of the lifting movement
Implementation Method 2
This is achieved in that the specimen is located on a specimen carriage which is guided vertically in a specimen carriage guide, that the drive mechanism converts the rotational movement into a linear movement for the stroke of the specimen carriage by using a crank drive
Implementation Method 3
the means are adapted to adjust the distance of the crank pin from the center line of the crankshaft
Implementation Method 4
To compensate for the imbalance, weights can be provided which compensate for the weight of the carriage during the downward movement
Data Source
Figure 1
Figure 2~2b
Figure 3~4b
AI summary
The invention relates to a rotary microtome (1) with a vertically guided specimen carriage (2) and a drive mechanism that converts a rotary movement into a linear movement for the stroke (8) of the specimen carriage (2). Such a rotary microtome is designed to be suitable for use with samples of different size categories. According to the invention, means are provided for adjusting the length of the linear movement produced by one revolution of the drive mechanism.