Sewing Machine Common Drive Source for Cutting and Picking
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Solution Overview
Problem
Existing sewing machines have complex configurations for the cutting mechanism and picker, which can be simplified to reduce costs and manufacturing workload while maintaining functionality.
Innovation Solution
A sewing machine design where the cutting mechanism and picker share a common drive source, with the cutting mechanism positioned near the shuttle and the picker able to move between operating and non-operating positions, simplifying the internal structure and reducing the number of parts needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate drive sources are used for the cutting mechanism and picker, then each component can be independently controlled, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the drive sources for the cutting mechanism and picker into a single integrated drive system. The picker drive motor is configured to drive both the picker mechanism and the cutting mechanism through a shared transmission system, reducing the total number of drive sources while maintaining coordinated operation of both functions
Solution Approach 2:
The picker drive motor is designed to perform multiple functions: driving the picker for thread holding and simultaneously driving the cutting mechanism for thread cutting. This multi-functional drive source eliminates the need for separate motors while ensuring both operations can be performed by a single power unit
2Area of stationary object
If the cutting mechanism is positioned away from the shuttle, then there is more space for other components, but the structure becomes more complex and larger
Solution Approach 1:
The cutting mechanism is nested within or adjacent to the shuttle structure, utilizing the existing space around the shuttle. The cutting blades and associated components are arranged in a compact configuration that fits within the shuttle's structural envelope, eliminating the need for additional space while maintaining functionality
3Reliability
If separate drive mechanisms are used for cutting and picking operations, then each operation can be optimized independently, but the manufacturing cost and workload increase
Solution Approach 1:
The transmission system combines the drive paths for both cutting and picking operations into a unified mechanism. Gears, shafts, and transmission elements are shared between the two functions, reducing the number of parts that need to be manufactured, assembled, and maintained while ensuring reliable operation of both functions
Data Source
AI summary
A sewing machine includes a cutting mechanism, a picker, and a drive portion. The cutting mechanism, which cuts an upper thread and a lower thread, is provided close to a shuttle that supplies the lower thread. The picker is provided such that it is able to move between an operating position and a non-operating position. The operating position is a position of the picker where the picker is proximate to the shuttle. The non-operating position is a position of the picker farther away from the shuttle than the operating position. The picker holds the upper thread in the operating position. The drive portion is provided as a common drive source for a cutting operation by the cutting mechanism and for movement of the picker.