Device for controlling the positioning of a workpiece in a sewing machine
AssigneePfaff Aktiengesellschaft
InventorGunther Mall
Life of this patent
Estimating the term…
Abstract
A sewing station has a sewing machine and a feed device with a holder for the product being stitched that is driven by at least one drive mechanism to execute a predeterminable course of motion. To prevent damage or destruction of components of the stitching area from deviations of the holder for the produce being stitched from the predetermined course of motion, the stitching station has a monitor that includes a marking and a sensor conforming to the form of stitch to be made. These are movable relative to one another as a function of the motion of the holder for the product being stitched. The sensor is connected to a control circuit to emit a switching signal after the occurrence of an error.
Claims11
A sewing station for a sewing machine having a feed device, comprising a holder for the workpiece being stitched connected to said feed device being driven thereby to execute a predeterminable motion, a monitor movable as a function of the motion of said holder having a marking corresponding to a predetermined motion, a sensor scanning said marking, a control circuit connected to said sensor and to said feed device and emitting switching signals to said feed device when said holder for the product being stitched deviates from a predetermined motion.
A device for controlling the position of a workpiece in a sewing machine having a drive for a needle which reciprocates at a sewing station to sew a workpiece, comprising a holder engageable with the workpiece for advancing it through a sewing station through a selected path, a feed device driven by the drive and connected to said holder for moving said holder with the workpiece, and monitor means associated with said holder for monitoring the position of said holder and connected to said feeding device for controlling the movement of said holder.
Dependencies are inferred from the claim text.