Patents by Inventor John J. Schachte
John J. Schachte has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4153863Abstract: A speed and position controller for a DC motor, having SCR power circuits, has a digital computing device directly connected to the SCR firing circuits for controlling the SCR firing angle. A command signal in the form of a number is applied to the computing device from a tape reader or other command signal generator. An encoder, operatively connected to the shaft of the motor, furnishes a feedback pulse frequency indicative of motor speed to a counter. The computing device periodically samples the number in the counter for speed and position computations. The computed firing angles are compared with maximum firing angles loaded into the computing device to prevent excessive currents which could cause arcing or demagnetization.Type: GrantFiled: April 20, 1977Date of Patent: May 8, 1979Assignee: Colt Industries Operating Corp. (Pratt & Whitney Machine Tool Division)Inventors: John J. Schachte, Geoffrey A. Ross
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Patent number: 4091294Abstract: In apparatus for controlling the speed and torque of a multiphase a.c. motor in accordance with digital control signals, a first regulation circuit regulates the frequency of the a.c. electrical signal applied to the motor and another regulation circuit regulates the voltage of the a.c. signal. Both regulation circuits are controlled by digital control signals in a series of discrete steps over a range of control values and the control signals are supplied periodically to the regulation circuits. The speed and torque are controlled in accordance with an algorithm relating speed and torque to the frequency and voltage of the source of electric power which is applied to the motor, calculated by computing apparatus on a periodic basis. In one embodiment the position of the magnetic flux of the stator is controlled directly.Type: GrantFiled: July 19, 1976Date of Patent: May 23, 1978Assignee: Kearney & Trecker CorporationInventors: Frank Zankl, Edward E. Kirkham, Richard E. Stobbe, John J. Schachte
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Patent number: 4065988Abstract: This invention relates to a greatly simplified workpiece changer mechanism in combination with a simplified tool storage and changing mechanism for a machine tool. To accomplish this, a rotatable work carrying spindle is adapted to support a workpiece for selective rectilinear movement relative to an associated rotary cutting tool, and to support the same workpiece for selective rotational movement relative to a rectilinearly movable cutting tool carried by the same spindle. The work receiving spindle is mounted in spaced apart relationship to a storage support adapted to releasably carry a workpiece for selective interchange with a workpiece carried by the work spindle. To effect a selective interchange of workpieces between the work spindle and the storage support, a work transfer arm is pivotally supported between the work spindle and the work support.Type: GrantFiled: October 7, 1976Date of Patent: January 3, 1978Assignee: Kearney & Trecker CorporationInventors: Earl R. Lohneis, John J. Schachte
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Patent number: 4028599Abstract: In apparatus for controlling the speed and torque of a multiphase a.c. motor in accordance with digital control signals, a first regulation circuit regulates the frequency of the a.c. electrical signal applied to the motor and another regulation circuit regulates the voltage of the a.c. signal. Both regulation circuits are controlled by digital control signals in a series of discrete steps over a range of control values and the control signals are supplied periodically to the regulation circuits. The speed and torque are controlled in accordance with an algorithm relating speed and torque to the frequency and voltage of the source of electric power which is applied to the motor, calculated by computing apparatus on a periodic basis. In one embodiment the position of the magnetic flux of the stator is controlled directly.Type: GrantFiled: February 19, 1975Date of Patent: June 7, 1977Assignee: Kearney & Trecker CorporationInventors: Frank Zankl, Edward E. Kirkham, Richard E. Stobbe, John J. Schachte
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Patent number: 4013176Abstract: This invention relates to a greatly simplified workpiece changer mechanism in combination with a simplified tool storage and changing mechanism for a machine tool. To accomplish this, a rotatable work carrying spindle is adapted to support a workpiece for selective rectilinear movement relative to an associated rotary cutting tool, and to support the same workpiece for selective rotational movement relative to a rectilinearly movable cutting tool carried by the same spindle. The work receiving spindle is mounted in spaced apart relationship to a storage support adapted to releasably carry a workpiece for selective interchange with a workpiece carried by the work spindle. To effect a selective interchange of workpieces between the work spindle and the storage support, a work transfer arm is pivotally supported between the work spindle and the work support.Type: GrantFiled: December 4, 1972Date of Patent: March 22, 1977Assignee: Kearney & Trecker CorporationInventors: Earl R. Lohneis, John J. Schachte
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Patent number: 3986088Abstract: In apparatus for controlling the speed and torque of a multiphase a. c. motor in accordance with digital control signals, a first regulation circuit regulates the frequency of the a. c. electrical signal applied to the motor and another regulation circuit regulates the voltage of the a.c. signal. Both regulation circuits are controlled by digital control signals in a series of discrete steps over a range of control values and the control signals are supplied periodically to the regulation circuits. The speed and torque are controlled in accordance with an algorithm relating speed and torque to the frequency and voltage of the source of electric power which is applied to the motor, calculated by computing apparatus on a periodic basis. In one embodiment the position of the magnetic flux of the stator is controlled directly.Type: GrantFiled: February 19, 1975Date of Patent: October 12, 1976Assignee: Kearney & Trecker CorporationInventors: Frank Zankl, Edward E. Kirkham, Richard E. Stobbe, John J. Schachte
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Patent number: 3986087Abstract: In apparatus for controlling the speed and torque of a multiphase a.c. motor in accordance with digital control signals, a first regulation circuit regulates the frequency of the a.c. electrical signal applied to the motor and another regulation circuit regulates the voltage of the a.c. signal. Both regulation circuits are controlled by digital control signals in a series of discrete steps over a range of control values and the control signals are supplied periodically to the regulation circuits. The speed and torque are controlled in accordance with an algorithm relating speed and torque to the frequency and voltage of the source of electric power which is applied to the motor, calculated by computing apparatus on a periodic basis. In one embodiment the position of the magnetic flux of the stator is controlled directly.Type: GrantFiled: February 19, 1975Date of Patent: October 12, 1976Assignee: Kearney & Trecker CorporationInventors: Frank Zankl, Edward E. Kirkham, Richard E. Stobbe, John J. Schachte