Dual Motor Drive for Bread Slicer Blade Speed Control
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Solution Overview
Problem
Existing motor drives for circular blades in bread slicers lack the ability to variably adjust the rotational speed of the blade to cutting speed, leading to inefficient cutting of soft or warm bread, which often results in torn slices.
Innovation Solution
A motor drive system utilizing two separate drive motors, where one motor drives the eccentric arm and the other drives the circular blade independently, allowing for adjustable speed ratios and a compact design through the use of a hollow and solid shaft configuration with toothed belts for efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a planetary gear system with a single drive motor is used, then the device complexity is reduced and cost is lowered, but the ability to independently control blade rotational speed and cutting speed is lost, resulting in poor cutting quality for soft or warm bread
Solution Approach 1:
The drive system is segmented into two independent drive motors: a first drive motor that controls the eccentric arm movement (and thus the cutting speed), and a second drive motor that controls the circular blade rotation (and thus the blade speed). This segmentation allows independent control of cutting speed and blade speed, enabling adaptation to different bread types while maintaining manageable system complexity through modular design.
2Productivity
If the rotational speed of the circular blade is increased to提高 cutting speed, then productivity increases, but soft bread slices tear during cutting
Solution Approach 1:
The system dynamically adjusts the ratio between blade rotational speed and cutting speed based on the bread type being processed. For soft or warm bread, the control unit reduces the blade rotational speed relative to the cutting speed, preventing slice tearing. For harder breads, the blade speed can be increased to maintain productivity. This dynamic adjustment capability resolves the contradiction between cutting speed and slice integrity.
3Object-affected harmful factors
If the rotational speed of the circular blade is decreased to cut soft bread gently, then slice quality improves, but the cutting process becomes slower
Solution Approach 1:
The control unit enables dynamic adjustment of the blade rotational speed to match the cutting speed. When processing soft bread, the system可以降低 blade speed relative to cutting speed to prevent tearing. When processing harder breads or when higher productivity is needed, the blade speed can be increased. This dynamic capability allows the system to optimize both slice quality and cutting speed depending on the specific application.
4Adaptability or versatility
If two separate drive motors are used to independently control blade speed and cutting speed, then adaptability and cutting quality improve, but device complexity and cost increase
Solution Approach 1:
The hollow shaft of the first drive motor is designed to accommodate the solid shaft of the second drive motor, creating a nested configuration. This nesting allows both drive motors to be compactly integrated within the housing space, reducing the overall footprint and making the increased complexity of having two motors more manageable. The nested design enables independent control of blade speed and cutting speed while maintaining a relatively compact structure.
5Volume of moving object
If a hollow shaft configuration with nested shafts is used to accommodate two drive motors, then the device becomes more compact, but manufacturing complexity increases
Solution Approach 1:
The hollow shaft of the first drive motor is designed to accommodate the solid shaft of the second drive motor, creating a nested configuration that maximizes space utilization. This nested design allows both drive motors to be compactly integrated within the housing space, reducing the overall footprint. While the manufacturing of nested shafts requires precision, the modular design allows for standardized production and assembly, making the complexity manageable.
Data Source
Figure 1
AI summary
The invention relates to a motor drive (10) for a cutting machine. The motor drive (10) comprises a first drive motor (12) and a second drive motor (14). The first drive motor (12) rotates an eccentric arm (22). The circular blade (32) of the cutting machine is rotatably mounted on the eccentric arm (22) and is rotated by the second drive motor (14).