An ergonomic design and performance evaluation of handy scanners by males

✍ Scribed by Yung-Hui Lee; James Weng

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 1020 KB
• Volume: 26
• Category: Article
• ISSN: 0003-6870
• DOI: 10.1016/0003-6870(95)00070-4

✦ Synopsis

This paper describes the results of an investigation of the difference in performance, posture used, strain on iforearm musculature, and subjective ratings of three handy scanners (models A, B and C). Both models A and B were scanners on the market. Model C was developed for validation. The gripping posture of the three models is distinct both in the anatomical and functional sense. Work with model A requires a thumb-forefinger side grip which induces an ulnar deviation angle; work with model B requires a thumt+fmger grip; work with model C requires a thumbfinger-palmar grip. Performance evaluation of scanner models A, B and C on different scanning tasks (with and without stitch) using different resolution modes (100 and 400 dpi), indicated that using the proposed model C resulted in a 13% higher success rate, a 14% shorter completion time, the smallest self-selected working area, least strain on the forearm muscles, and highest subjective ratings among the three. Model C appeared to provide the greatest opportunity for delicate adjustments of posture in response to the activity of the skin receptors, justifying the ergonomic input into the design.