Abstract: Apparatus and method for producing a novel drawn film by propelling individual carriages along opposed loops from a first speed abutted in stacks in carriage collection sections to a second speed space apart in a drawing section of a tenter frame and to a third speed in stack forming sections where the carriages return to the first speed in the stacks. First primaries positioned adjacent one part of each loop develop electromagnetic waves for engaging synchronous secondaries attached to active carriages to provide controlled spacing of such carriages, and second primaries adjacent another part of the loop develop other electromagnetic waves for engaging hysteresis secondaries attached to active and to passive carriages to provide controlled abutting of the carriages.

Abstract: Apparatus and method for producing a novel drawn film by propelling individual carriages along opposed loops from a first speed abutted in stacks in carriage collection sections to a second speed space apart in a drawing section of a tenter frame and to a third speed in stack forming sections where the carriages return to the first speed in the stacks. First primaries positioned adjacent one part of each loop develop electromagnetic waves for engaging synchronous secondaries attached to active carriages to provide controlled spacing of such carriages, and second primaries adjacent another part of the loop develop other electromagnetic waves for engaging hysteresis secondaries attached to active and to passive carriages to provide controlled abutting of the carriages.

Abstract: A system useful for controlling multiple secondaries of a linear disposed motor along an elongated path, with the system having a linear synchronous motor with its elongated primary disposed along the elongated path and at least one secondary responsive to the primary with means disposed thereon for attachment to a body to be propelled along the path, a plurality of linear synchronous motor drivers for providing inputs to designated coil windings of the primary for developing a traveling electromagnetic wave along the primary, a driver controller means connected to each motor driver which has plurality of memory sections for storing therein characteristics of waveforms for use in the system of the invention, a central controller for controlling the output of the plurality of driver controller means and a system computer for down loading instructions for the various waveform patterns to the memories of the driver controller means and for overall supervisory control of the system of the invention.

Abstract: A system for propelling individual carriages along an endless path from a first speed abutted in a stack in a carriage collection section, to a second speed spaced apart in an operational section, and to a third speed in a stack-forming section where the carriages return to the first speed in the stack. Novel carriages are propelled by a linear motor wherein each carriage has attached a synchronous and a hysteresis secondary. A first primary positioned adjacent one part of the path develops electromagnetic waves for engaging the synchronous secondaries to provide controlled spacing of the carriages, and a second primary adjacent another part of the path develops other electromagnetic waves for engaging the hysteresis secondaries to provide controlled abutting of the carriages.

Abstract: A system useful for controlling multiple secondaries of a linear disposed motor along an elongated path, with the system having a linear synchronous motor with its elongated primary disposed along the elongated path and at least one secondary responsive to the primary with means disposed thereon for attachment to a body to be propelled along the path, a plurality of linear synchronous motor drivers for providing inputs to designated coil windings of the primary for developing a traveling electromagnetic wave along the primary, a driver controller means connected to each motor driver which has plurality of memory sections for storing therein characteristics of waveforms for use in the system of the invention, a central controller for controlling the output of the plurality of driver controller means and a system computer for down loading instructions for the various waveform patterns to the memories of the driver controller means and for overall supervisory control of the system of the invention.

Abstract: A circular scan reader utilizes oscillating mirrors and associated optics to generate a circular scan pattern of laser light focused to a small spot. The angle of the scan emanating from a point just inside the reader through a window forms a conical shape which permits scanning inside a yarn tube without inserting any portion of the reader into the tube. When the scan passes over a bar coded label, the changes in reflection of light between the bars and spaces are detected by a photodetector mounted on the face of the window. These fluctuations in light which correspond in width to the bar and space width are converted to an electrical signal that is amplified, and decoded. A driver circuit for the oscillating mirrors controls the scan rate and scan pattern. The scan rate is modulated to cause a variation in the sweep depth in the tube thus providing an area scan. The area scan reduces the need for accurate label placement in the tube core.