Burlington Industries, Inc.

William D Harris

Robert H Best

Method and apparatus for altering the static electric charges of sheets of dielectric material arranged in a stack in which the stack is subjected to a high intensity electrostatic gradient. Interlock and shorting structures are utilized for preventing injury to users due to electrical shock.

Electrostatic treatment of paper

A method and system for maintaining precise electrically neutral, positive or negative atmosphere in an area, such as a textile mill, by adding charged ions to air being pumped into that area, for example, through an air conditioning duct whereby at least two spaced apart grids are mounted in the duct with one connected to a positive high voltage source and the other connected to a negative high voltage source so that both grids produce ions and the voltages applied thereto are controlled to maintain the area atmosphere neutral, positively charged or negatively charged as required to dissipate an undesired charge generated in a manufacturing process.

Method and system for maintaining an electrically neutral atmosphere

A system for producing a control signal upon intrusion of a human part into a protected area, for example the area about the needle of a sewing machine, whereby radio frequency signals at a predetermined frequency are coupled to the human machine operator from a plate on which he sits or stands. As the operator's fingers or other body part approaches the protected area, an antenna receives the rf signal and applies it to an rf phase lock loop receiver which produces an output pulse when the received signal is at the predetermined frequency and is above a predetermined amplitude to operate solenoids which prevent or terminate machine operation. Preferably, withdrawal of the body part triggers a timer which produces a signal permitting the machine to operate for a given time which is greater than the normal time between intrusions, thus continuously checking that the system is working properly.

Injury protection device for machinery

A method and system for ionizing air passing through a metallic duct, e.g. to maintain precise electrically neutral, positive or negative atmosphere in an area, such as a textile mill, by adding charged ions to air being pumped into that area, with at least one electrical grid mounted in the duct by means of one or more insulator posts connecting the grid to a duct wall and adapted for connection to a DC high voltage source whereby buildup of conductive material such as grease or lint in a conductive path between the grid and duct wall is prevented. In one embodiment this is accomplished by providing an insulating sleeve within the duct and surrounding the grid, this sleeve by protecting against short circuits also permitting high currents to be safely used. In a second embodiment air deflectors mounted on the grid wall deflect the air in the duct away from the insulator posts, preferably with the aid of clean air injected between the air deflectors and duct wall.

Means for improving ionization efficiency of high-voltage grid systems

A method and system for maintaining precise electrically neutral, positive or negative atmosphere in an area, such as a textile mill, by adding charged ions to air being pumped into that area, for example through an air conditioning duct whereby at least two spaced apart grids are mounted in the duct with one connected to a positive high voltage source and the other connected to a negative high voltage source so that both grids produce ions and the voltages applied thereto are controlled to maintain the area atmosphere neutral, positively charged or negatively charged as required to dissipate an undesired charge generated in a manufacturing process.

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Greensboro, NC, United States of America

William D Harris