Sewing Machine Cast Housing with Operator-Side Opening
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Solution Overview
Problem
The existing sewing machines are complex to manufacture and maintain due to their design, which lacks simplicity and accessibility for internal components, leading to difficulties in repair and maintenance.
Innovation Solution
A sewing machine with a cast main housing part that is open on the operator side, allowing for core-free casting and easy access, combined with a compact arm shaft drive and external cooling of the drive motor, enabling a stable and compact design with reduced transmission paths and using a toothed belt as a low-wear drive means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the main housing part is designed as a closed cast structure, then manufacturing precision and structural integrity are improved, but accessibility for maintenance and repair deteriorates
Solution Approach 1:
The main housing part is segmented into a closed cast structure for structural integrity and a removable housing cover for accessibility. The cover can be detached to provide access to internal components for maintenance and repair, while the main cast structure remains intact and precision-manufactured.
2Volume of moving object
If the drive motor is positioned inside the sewing machine housing, then device compactness is improved, but cooling efficiency deteriorates
Solution Approach 1:
A heat sink is introduced as an intermediary component between the drive motor and the external environment. The heat sink conducts heat away from the motor and dissipates it to the surrounding air, enabling effective cooling while the motor remains positioned inside the compact housing.
3Ease of manufacture
If the drive shaft extends parallel to and spaced apart from the arm shaft, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
A toothed belt is used to replace direct mechanical coupling between the drive shaft and arm shaft. The toothed belt transmits rotational motion from the drive motor's parallel drive shaft to the arm shaft, simplifying motor positioning while maintaining reliable power transmission without complex gear mechanisms.
Data Source
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AI summary
A sewing machine has a sewing machine housing (5) with a cast main housing part (13), which is open on one operator side. This results in a sewing machine whose manufacture is simplified.