An alternative speed control for industrial sewing machines

Area of Science:

• Rehabilitation Engineering
• Human-Computer Interaction
• Ergonomics

Background:

• Traditional machine controls often require lower limb operation, limiting employment for paraplegics in seated, fixed-workstation occupations.
• Existing industrial sewing machines utilize treadle controls, posing accessibility challenges for individuals with mobility impairments.

Purpose of the Study:

• To design and evaluate a novel chest-operated speed-control mechanism for industrial sewing machines, specifically for paraplegic users.
• To compare the performance, user experience, and ergonomic impact of the chest-control device against traditional treadle controls.

Main Methods:

• A chest-operated lever control was designed, activated by sternal movement.
• Twenty non-handicapped individuals without prior sewing experience tested both the chest-control and traditional treadle controls.
• Data collection included questionnaires, anthropometric measurements, and sewing task performance analysis.

Main Results:

• No significant differences were found in task accuracy or completion time between the chest-control and treadle devices.
• The chest-control device resulted in significantly fewer machine stops and reduced overall postural stress.
• User preference for the two control devices was equally divided.

Conclusions:

• The chest-control mechanism effectively enables individuals with lower limb impairments to operate stitching-related machines, expanding employment possibilities.
• This alternative control offers comparable performance to conventional treadle controls for both handicapped and non-handicapped users.
• The device's applicability extends to various machines requiring seated operation at a fixed workstation.