Pilgrim Step Transmission Layout for Low-Stress Spinning Drives
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Solution Overview
Problem
Existing spinning machine drives for pilgrim step rotation are complex, expensive, and inefficient due to mechanical stress, high energy consumption, and inflexibility, particularly in pilgrim stepping gears that require coordinated design and adjustment, which is time-consuming and costly.
Innovation Solution
A transmission system with separate and optimized gear stages that allow for independent arrangement and adjustment, featuring a drive shaft, output shaft, and gear elements that enable pilgrim step rotation with reduced mechanical stress and energy efficiency, allowing for flexible operation and adjustment without requiring extensive disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pilgrim step gearboxes with three meshing gear wheels are used, then step-by-step rotation is achieved, but mechanical stress and energy consumption become enormous due to positive coupling and oscillating rotation of multiple gear wheels
Solution Approach 1:
The transmission is divided into two separate stages: a first transmission stage with a drive shaft and first transmission element, and a second transmission stage with an output shaft and second transmission element. These stages are arranged separately and connected only through the transmission section, eliminating the need for multiple meshing gear wheels to oscillate together. This segmentation reduces mechanical stress and energy consumption by avoiding the positive coupling of three gear wheels.
2Adaptability or versatility
If three gear wheels are positively coupled in a traditional gearbox, then step-shift rotation is transmitted, but the design becomes inflexible as each gear wheel must be designed to work with two other gear wheels
Solution Approach 1:
By separating the transmission into two independent stages connected only through the transmission section, each transmission element can be designed and optimized independently. The first transmission element needs to work only with the drive shaft and transmission section, while the second transmission element needs to work only with the output shaft and transmission section. This eliminates the complexity of designing three gear wheels that must all mesh with each other.
3Ease of operation
If traditional gearboxes with oil-lubricated assemblies are used, then transmission function is provided, but adjusting the brazing point requires opening the gearbox housing, involving additional design effort and risk of contamination
Solution Approach 1:
The transmission section is designed as a separate, accessible module between the two transmission stages. This modular arrangement allows the transmission section to be adjusted independently without requiring opening of the main gearbox housing. The separate arrangement of transmission stages enables maintenance and adjustment activities to be performed on the transmission section while minimizing disruption to the overall system and reducing contamination risks.
4Productivity
If direct drives with servo motors are used, then frequent reversal of rotation direction is achieved, but the system becomes very expensive and generates enormous heat requiring complex cooling systems
Solution Approach 1:
The patent replaces direct electric drives with a mechanical transmission system using separate transmission stages and a transmission section. This mechanical approach handles frequent direction reversals more efficiently than direct servo motors, reducing heat generation and eliminating the need for complex cooling systems while maintaining the required reversal speed and productivity.
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 solution provides a cost-effective, flexible, and energy-efficient transmission system that enables faster operation with reduced vibration and mechanical stress, allowing for efficient pilgrim step rotation in spinning machines, such as combing machines, with the ability to adjust settings during operation.
Implementation Method 1
The transmission section (4) includes a first transmission element (19, 21), which is rotationally connected to the drive shaft (7) as part of a first transmission stage, and a second transmission element (20), which is distinct from the first transmission element (19, 21), which is rotationally connected to the output shaft (8) as part of a second transmission stage. The second transmission element (20) is additionally rotationally connected to the first transmission element (19, 21).
Data Source
Figure 1a~1b
Figure 1c~2
Figure 3
AI summary
A transmitting portion of a transmission (2), which transmission has an input shaft (7) and an output shaft (8), comprises a first transmission element (21), which is rotationally operatively connected, as part of a first transmission stage, to the input shaft (7), and a second transmission element (21), which is different from the first transmission element (17) and is rotationally operatively connected, as part of a second transmission stage, to the output shaft (8) and to the first transmission element (17). The transmission (2) is designed such that an input rotation of the input shaft (7) in an input rotational direction by a first input rotational angle leads to a rotation of the output shaft (8) in a first output rotational direction by a first output rotational angle (α). A subsequent input rotation by a second input rotational angle leads to a rotation of the output shaft (8) in a second output rotational direction by a second output rotational angle (β), the second output rotational direction being opposite the first output rotational direction. The output rotational angles (α, β) have a sum of less than or equal to 960° and are different from each other. Two transmissions (2) can be attached to each other such that they are drivingly interconnected. An input portion of an assembly (1) can be rotationally operatively connected to the output side of such a transmission (2). In a spinning machine having a pair (80) of rollers (80) which interact with each other with respect to fiber transport and having an assembly (1) of this type, the output shaft (8) of the transmission (2) is rotationally operatively connected to a roller (80) of the roller pair (80).