Loom Shedding Motor Synchronization via Shaft Rotation Detection
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Solution Overview
Problem
The existing synchronous control methods for looms with Jacquard shedding devices require high-power synchronous motors, increasing the cost due to the need for precise synchronization of the drive shaft and main shaft rotations, which are affected by varying loads and mechanical complexities.
Innovation Solution
A method that detects the rotation amount of the drive shaft and controls the main shaft motor to synchronize with it, using an inexpensive induction motor for the shedding motor, and adjusts control parameters based on load variations to maintain accurate synchronization without the need for high-power motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-power synchronous motor is used as the shedding motor to achieve precise synchronous control, then the synchronization accuracy between drive shaft and main shaft is improved, but the cost of the loom is increased
Solution Approach 1:
The patent replaces the mechanical synchronous control system with an electrical control system. Instead of using a mechanical coupling between the main shaft and drive shaft, the invention uses a sensor to detect the rotation position of the main shaft and electronically controls the shedding motor to achieve synchronous operation, thereby reducing mechanical complexity and cost while maintaining synchronization accuracy
Solution Approach 2:
The patent implements a feedback control mechanism where a sensor detects the rotation position of the main shaft and feeds this information back to the control system. The control system then adjusts the shedding motor's operation based on this feedback to maintain accurate synchronization between the drive shaft and main shaft, enabling precise control without requiring an expensive high-power synchronous motor
2Ease of repair
If the shedding motor is made independent from the main shaft motor, then the ease of maintenance is improved and mechanical components are reduced, but the difficulty of achieving synchronous control is increased
Solution Approach 1:
The patent replaces the mechanical coupling system with an electrical control system. The independence of the shedding motor is maintained while synchronous control is achieved through electronic means - a sensor detects main shaft position and the control system coordinates the shedding motor's operation, simplifying mechanical structure while managing control complexity through electronics
Solution Approach 2:
The patent introduces an intermediary control system that mediates between the independent shedding motor and the main shaft motor. This intermediary system receives position information from the main shaft via a sensor and coordinates the shedding motor's operation, enabling independent motors to work synchronously without direct mechanical coupling
3Device complexity
If mechanical coupling is used between main shaft and drive shaft, then the synchronous control is simplified, but the number of mechanical components is increased and maintenance becomes troublesome
Solution Approach 1:
The patent directly replaces the mechanical coupling system with an electrical control system. Instead of using shafts, chains, or belts to mechanically couple the main shaft and drive shaft, the invention uses a sensor to detect main shaft position and electronically controls the shedding motor to achieve synchronous operation, thereby reducing mechanical components and improving maintainability while managing control complexity through electronics
Data Source
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AI summary
In a loom including a shedding device (2) that includes a shedding motor (23) independent from a main shaft motor (13) of the loom as a driving source and that displaces each of healds in an up-down direction as a single drive shaft (22) that is common to all of the healds is driven by the shedding motor (23), a rotation amount of the drive shaft (22) in each weaving cycle is detected at least when the loom is performing a normal operation, and driving of the main shaft motor (13) is controlled so that a main shaft (12) of the loom is rotated so as to be synchronized with the drive shaft (22) in accordance with a detection signal indicating the detected rotation amount.