Device for sewing workpiece plies together in contour alignment
AssigneePfaff Industriemaschinen GmbH
InventorErich Willenbacher
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Abstract
Two workpiece plies, placed on one another, of which the lower one is larger in width than the upper one, are to be sewn together with their edge contours aligned with each other. The device used for this purpose comprises a cutting mechanism provided ahead of the sewing machine in a workpiece feed direction, and following the contour of the upper work ply by means of guide unit for sensing this contour, so that the projecting portion of the work ply is cut off. To prevent the work plies from mutual displacement during their feeding toward the sewing machine, they are secured to each other by spot sealing at some locations wherefor a sealing tape is introduced between the plies.
Claims10
A device for sewing upper and lower workpiece plies together adjacent contoured substantially aligned edges thereof in a sewing machine having automatic workpiece guide means for sewing along a contour as the plies are fed in a sewing direction, the lower workpiece ply initially extending beyond the contoured edge of the upper workpiece ply, comprising:
- a cutting mechanism positioned upstream of the sewing machine workpiece guide means in the sewing direction, having a movable cutting tool for cutting a portion of the lower workpiece ply extending beyond the contoured edge of the upper workpiece ply, said cutting mechanism including means for sensing the contoured edge of the upper ply and means for moving the cutting tool in response to said sensing means to follow the contoured edge of the upper ply;
- and
- a feed mechanism positioned between said cutting mechanism and the sewing machine workpiece guide for moving the workpiece plies together into the sewing machine workpiece guide means.
Dependencies are inferred from the claim text.