Microtome Auto-Rocking Mode for Ergonomic Sectioning
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Solution Overview
Problem
Microtomes face ergonomic issues due to unergonomic rocking movements required for adjusting cutting stroke lengths, and users struggle to control cutting movements, especially when working with sensitive samples.
Innovation Solution
A microtome with two operating modes allows users to select between a full stroke length and a shorter rocking movement, enabling ergonomic one-directional handwheel rotation and precise control of cutting speed and section quality through a control unit and encoder system, with adjustable stroke lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handwheel is mechanically coupled to the sample holder or cutting unit to produce reciprocating movement, then the cutting movement can be controlled manually, but the user must perform unergonomic rocking movements when using shorter stroke lengths
Solution Approach 1:
The patent replaces the direct mechanical coupling between the handwheel and the reciprocating mechanism with an electronic control system. The handwheel is equipped with an encoder that detects rotational movements, and a motor (stepper or servo) executes the cutting movement based on detected rotations. This substitution eliminates the need for complex mechanical linkages and allows the control unit to manage the reciprocating movement electronically, thereby improving ergonomics while maintaining controllability.
Solution Approach 2:
The patent introduces an intermediary control unit that mediates between the manual handwheel input and the motor-driven reciprocating mechanism. The control unit receives rotational movement data from the encoder on the handwheel and translates it into controlled motor movements. This intermediary layer allows the system to interpret user intent and execute appropriate cutting strokes, whether full or partial, without requiring the user to perform physically demanding rocking motions.
2Manufacturing precision
If the handwheel is rotated through a full revolution to produce one reciprocating movement, then exactly one thin section is cut, but the cutting speed is reduced when shorter stroke lengths are needed
Solution Approach 1:
The patent implements dynamic adjustment of the reciprocating movement parameters through electronic control. The control unit can adapt the stroke length and cutting speed based on real-time operational requirements. When high section quality is needed, the system performs slower, more precise reciprocating movements with appropriate stroke lengths. When productivity is prioritized, the system can increase cutting frequency while maintaining adequate section quality, all controlled dynamically without fixed mechanical constraints.
Solution Approach 2:
The patent enables changing of cutting parameters (stroke length, cutting speed, frequency) through electronic control rather than fixed mechanical settings. The control unit adjusts motor movement parameters based on encoder feedback and user input, allowing optimization of the balance between section quality and cutting frequency. This parametric control allows the system to adapt to different sample types and cutting requirements dynamically.
3Measurement precision
If motor means are used to accomplish the relative movement between sample holder and cutting unit, then cutting movement can be precisely controlled, but the user cannot easily influence the cutting movement itself
Solution Approach 1:
The patent implements a feedback mechanism where an encoder on the handwheel detects rotational movements and provides this information to the control unit. The control unit uses this feedback to precisely control the motor-driven reciprocating mechanism. This closed-loop approach ensures that user input is accurately translated into controlled cutting movements, maintaining user influence over the cutting process while achieving precise motor control. The system responds to user actions with predictable and accurate movements.
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 solution enhances user ergonomics, improves section quality by reducing cutting speed for shorter strokes, and increases cutting frequency, allowing for faster production of thin sections while ensuring safe sample handling.
Implementation Method 1
an encoder which detects rotational movement of the handwheel
Data Source
AI summary
The present invention relates to a microtome (10) including a sample holder (12) a cutting unit (16), and a drive unit (22) capable of producing a relative movement between the sample holder (12) and the cutting unit (16) for cutting the sample. In addition, the microtome (10) has a handwheel (32) and an encoder (38). A control unit (40) controls the drive unit (22) as a function of the rotational movement of the handwheel (32) detected by the encoder (38) and in such a way that, in a first operating mode, the relative movement produced between the sample holder (12) and the cutting element (16) by the drive unit (22) when the handwheel (32) is rotated through a full revolution has a maximum first stroke length and that, in a second operating mode, the relative movement has a preset second stroke length shorter than the maximum first stroke length.