Abstract: The present invention relates to a tennis racket accessory that adds weight at a selected position on a tennis racket and allows the player to position and remove the weight on tennis rackets of different sizes. The weight holder is made of a flexible material that wraps around a tennis racket handle and overlaps at the ends. The holder comprises two, spaced pockets with a weight in each pocket. The weights are in the shape of a cylinder. Each of the pockets are of sufficient size to permit its weight to roll along the holder lengthwise dimension over a distance that permits the weights to be moved by hand to opposite sides of the racket handle, and movable angularly to line up with the direction of the respective racket handle side.The holder includes means to fasten the ends together after it has been wrapped around the racket handle. The weights can be tightly pressed against the racket handle sides and the holder retained on the racket handle.

Abstract: Set points for thicknesses of coatings on opposite sides of a sheet are determined in response to measurements of the thickness of each coating. A computer responds to the two thickness measurements to derive indications of the spread of values of the measurements for each coating. The computer derives an additional indication of the spread of values for the total thickness of the two coatings. In response to the indications of the spreads of values for the coatings and the total coating thickness, minimum allowable average values for the two coating thicknesses and the total coating thicknesses are determined. The set point values for the two coating thicknesses are calculated from these minimum values, with consideration given to predetermined maximum and minimum ratios of the two coating thicknesses.

Abstract: The present invention relates to hand-held, portable twist drill sharpening devices. In the embodiment described the twist drill is placed in a holder and aligned with an optical indicating device for sharpening by a hand-held, flat surfaced sharpening stone. The holder is formed by two V-shaped clamping pieces that position the twist drill with respect to the holder apex angle and roof line. The optical indicating device includes an index member and means for positioning the index member with respect to the holder roof line at the predetermined angle for the drill cutting edge. When the index member is positioned, the twist drill cutting edge is aligned with it. The twist drill is positioned lengthwise and is already for sharpening each cutting edge without further adjustment, by moving the sharpening stone along the end faces of the clamping pieces.

Abstract: A sheet material characteristic monitoring apparatus is provided for use in processes involving the production and contouring of sheet material. In a preferred embodiment, the sheet material characteristic is measured at two or more stationary cross direction locations of the sheet. A digital computer computes a regression equation between the measured values of the sheet characteristic and their respective locations, which equation is evaluated between limits representing the sheet edges to provide a data profile comprising estimated values of the sheet characteristic across the width of the sheet. The data profile may be derived substantially instantaneously. The data profile may further be evaluated between limits representing one or more desired transverse dimensions of the sheet.

Abstract: Specifically disclosed is the combination of a paper making machine and a control system including an automatic arrangement which, on demand of the machine operator, performs a coordinated machine speed increase, maintaining the paper sheet characteristics substantially constant until the dryer steam pressure or the steam valve opening reaches a limit. During the speed increase, a number of other machine variables are compared with set limit values and the speed increase is discontinued when a limit is exceeded for a predetermined time period. When the steam pressure has been at a limit, or the steam valve has been wide open, for a predetermined time period the control system, upon sensing the limit being reached, switches to a dryer limited mode of operation wherein the steam pressure is maintained at the limit or the steam valve is locked open.

Abstract: Thickness of a sheet being produced by an extruder is controlled in response to measurements of: sheet thickness, the speed at which material is fed through a screw of the extruder, as determined by screw speed, and the speed with which material is taken away from the extruder, as determined by sheet speed. Measured thickness is compared with a setpoint for sheet thickness and a determination is made as to whether the thickness is in a predetermined, deadband region relative to the setpoint, or if the sheet is out of the deadband because it is excessively thin or excessively thick. In response to the sheet thickness being in the deadband region, the screw speed is changed in response to a signal indicative of the product of sheet speed error and rate of change of screw speed with respect to sheet speed. Sheet speed is controlled by multiplying sheet speed error by a predetermined constant.

Abstract: A process monitoring and control system is provided for use in a tire calendering system producing a strip of rubber tire material comprising a layer of tire cord laminated between first and second layers of rubber. In a preferred embodiment, the thickness of the first rubber layer is measured by a single point radiation backscatter gauge at a point prior to its lamination with the tire cord and second layer. The thickness of the first layer is controlled to a desired target by means of a control loop including the single point gauge. The total thickness of the combined layers is measured at the calender output by a total thickness gauge. Gauge coordination means, including a delay means, are provided whereby measurements of the thickness of the first layer and of the combined strip are derived over the same longitudinal portion of the strip.