Abstract
This article describes the application of an opto-mechanical lever apparatus in the education and research of the mechanism of sewing machines.One device is a projector which produces feed dog motion profiles. The device displays on a screen magnified pofilesof feed dog motion measured by contacting a lever with thefeed dog. For a better visualization of the feed dog motion profile, angular displacements of the arm shaft at regular intervals are indicated on the profile as bright spots by using two polaroid discs combined as a light beam modulator. The other is a projector for displaying dynamic torque profiles. The projector displays torque profiles on polar coordinates by making the inclination of a mirror attached to the arm shaft proportional to the torque.These apparatuses are easily attachable to and removable from regular household and industrial sewing machines to make them useful not only as teaching aids but also as service tools for lockstitch sewing machines.
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