Abstract: A switching power supply comprises an AC rectifier adapted to receive an AC line voltage and provide an input voltage (VIN) therefrom having a haversine waveform. A switching power converter is connected to the AC rectifier and provides a DC output voltage (VOUT) for a load. The switching power converter comprises an inductor and a power switch adapted to control current in the inductor. A pulse width modulator provides a drive signal to the power switch having a variable duty cycle to regulate current provided to the load by the switching power converter. A power factor correction circuit is adapted to control operation of the pulse width modulator so that a waveshape of the current from the AC rectifier matches the output voltage (VOUT) with changes in the input voltage (VIN) and load.

Abstract: Prior to pressurizing a garment at an opening therein, interior and exter elements are drawn together along the longitudinal axis of a tube through which the pressurizing gas is applied, to grip the garment around the full periphery of that opening. In one particular embodiment, a means for monitoring pressure within the garment is included in the apparatus to provide for leak testing the garment after it is pressurized.

Abstract: An apparatus for quarter or French folding towels, or the like. When quarter folding, a single, central longitudinal fold is made by conveying one side of the towel into engagement with one of two oppositely oriented, diagonal folding blades. When French folding, opposite sides of the towel are conveyed into engagement with the respective folding blades. The longitudinal folds are made around laterally spaced forms one of which is movable laterally toward or away from the other, the spacing of the forms depending on the width of the towel and also depending on whether the towel is being French or quarter folded. (If the towel is being quarter folded, the spacing of the outer edges of the forms is one-half the towel width, and, if the towel is being French folded, this spacing is one-third the towel width.