Abstract: A displacement sensing and guide apparatus for continuous sheet material wherein the edges of a moving sheet of material are sensed by electromechanical or other variable voltage or variable impedance sensing and feedback means and communicate electrically with an electrical switching system, either directly or through a balanced bridge circuit, to operate the switching system and to indicate and to correct a displacement of the sheet material from a predetermined position.

Abstract: Apparatus for forming a yarn package wherein the yarn package includes a plurality of axially stacked revolutions of yarn with each revolution formed to include a plurality of sinuous shaped wave patterns in each revolution, and wherein the sinuous pattern of adjacent revolutions are angularly offset relative to each other to form a yarn package having high porosity in the package to permit the ready flow of yarn treatment material therethrough. The yarn package forming apparatus includes a frame support means having a power driven turntable, with a pressure plate non-rotatably supported thereabove for vertical translating movement, and wherein the yarn package is formed between the rotatable turntable and the pressure plate.