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AssigneeHusqvarna Aktiebolag
InventorsBengt A. Bergvall, Kenneth O. E. Skogward
Estimating the term…
A measuring device for measuring the distance of feed of cloth in a sewing machine, comprising a wheel driven by the cloth without slippage and located at the presser foot. A plurality of slits on the wheel are arranged to cooperate with two slits in the bracket of the wheel, and thereby form two light gates producing two output signals in the form of a two bit binary code. This light is detected by photo transistors or photo diodes positioned to receive light through the slits from light emitting diodes or lamps. The output signals from the unit are applied to a data unit connected to compute a positive or negative feed of the cloth. The invention is especially useful when a buttonhole is to be sewn totally automatically.
In a measuring device for measuring movements of cloth fed by cloth feeding means for producing signals for controlling the cloth feeding means of a sewing machine, the improvement wherein said measuring device comprises measuring means including a digital pattern on a carrier and sensing means positioned to sense movement of said pattern with respect to said sensing means, said measuring means being positioned with one of said pattern and sensing means mounted to be driven directly with movement of cloth fed by said cloth feeding means, and further comprising a decoder for decoding the output of said sensing means, up-down counter means coupled to said decoder for counting in a direction determined by the direction of relative motion between said pattern and sensing means, and control circuit means coupled to said counter for providing said signals.
Dependencies are inferred from the claim text.