Apparatus for measuring angles

Claim 2

An angle measuring apparatus comprising first and second rotating discs of a magnetic material having the same number of toothed protuberances on their respective exterior circumferences; third and fourth rotating discs of magnetic or non-magnetic material having a single or the same number of U-shape cutouts, convex protrusions for small magnetic pieces on their respective exterior circumferences; a motor driveable connected to at least the said fiRst rotating disc to turn about a common axis; first and third electromagnetic pickups fixed facing each of the exterior circumferences of the said first and third rotating discs; a rotary shaft having the same center as that of the common rotary axis for the said at least first rotating disc but being able to turn in accordance with the rotating angle of an object being measured without regard to the said common rotary axis; second and fourth electromagnetic pickups being able to move along the exterior circumference of each of the said second and fourth rotating discs in accordance with the revolution of the said rotary axis; a circuit for shaping pulse signals having repetition frequency and phase matching each of the AC output signals of the said first and fourth electromagnetic pickups; a first counter using the pulse signal matching the output of the said first electromagnetic pickup as its counting input signal and the pulse signal matching the output of the said third electromagnetic pickup or its divided signal as a reset signal respectively; a second counter utilizing the pulse signal matching the output of the said second electromagnetic pickup as its counting input signal and the pulse signal matching the output of the said fourth electromagnetic pickup or its divided signal as a reset signal respectively; first and second decoders for decoding individually the computation of the said first and second counters, a flip-flop circuit set and reset with a set of arbitrary, matching output signals of the output signals of the said first and second decoders; a gate circuit controlled by the output signals of the said flip-flop circuit; a reference pulse oscillator for producing and delivering reference pulse signals to the said gate circuit; and a counter counting the pulse signals passing through the said gate circuit.

Claim 3

An angle measuring apparatus comprising first and second rotating discs of a magnetic material having the same number of toothed protuberances on their respective exterior circumferences; third and fourth rotating discs of a magnetic, or non-magnetic material having a single or the same number of U-shape cut-outs or convex protrusions or small magnetic pieces on their respective exterior circumferences; a motor causing the said first and fourth rotating disc to turn around a common shaft; first and third electromagnetic pickups fixed facing each of the exterior circumferences of the said first and third rotating discs; a rotary shaft having the same center as that of the common rotary shaft for the said first and fourth rotating disc but being able to turn in accordance with the rotating angle of an object being measured without regard to the said common rotary shaft; second and fourth electromagnetic pickups being able to move along the exterior circumference of each of the said second and fourth rotating discs in accordance with the revolution of the said rotary shaft; a circuit for shaping pulse signals having repetition frequency and phase matching each of the AC output signals of the said first and fourth electromagnetic pickups; a first counter using the pulse signal matching the output of the said first electromagnetic pickup as its counting input signal and the pulse matching the output of the said third electromagnetic pickup or its divided signal as a reset signal respectively; a second counter utilizing the pulse signal matching the output of the said second electromagnetic pickup as its counting input signal and the pulse signal matching the output of the said fourth electromagnetic pickup or its divided signal as a reset signal respectively; first and second decoders for decoding individually the computation of the said first and second counters; a flip-flop circuit for each toothed protuberance on the exterior circumference of each of the said first and second rotating discs individually set and reset with each set of matcHing output signals of the said first and second decoders; plural gate circuits corresponding in number to the said flip-flop circuits and controlled with the output signals therefrom; a reference pulse oscillator for producing and distributing the reference pulse signals to these gate circuits; delay circuits for varying the phase of each of the reference pulse signals distributed to each gate circuit; an ''''or'''' gate circuit for composing waves of the reference pulse signals having passed through each of the said gate circuits; a gate circuit installed at the output side of the said ''''or'''' gate circuit and put into a conducting state in an extremely long time width when compared with the period of the output signals of the said third and fourth electromagnetic pickups; and a counter for counting the number of pulse signals passing through the said gate circuit.

Claim 4

An angle measuring apparatus comprising first and second rotating discs of a magnetic material having the same number of toothed protuberances on their respective exterior circumferences; third and fourth rotating discs of a magnetic, or non-magnetic material having a single or the same number of U-shape cut-outs or convex protrusions or small magnetic pieces on their respective exterior circumferences; a motor causing the said first and fourth rotating disc to turn around a common shaft; first and third electromagnetic pickups fixed facing each of the exterior circumferences of the said first and third rotating discs; a rotary shaft having the same center as that of the common rotary shaft for the said first and fourth rotating disc but being able to turn in accordance with the rotating angle of an object being measured without regard to the said common rotary shaft; second and fourth electromagnetic pickups being able to move along the exterior circumference of each of the said second and fourth rotating discs in accordance with the revolution of the said rotary shaft; a circuit for shaping pulse signals having repetition frequency and phase matching each of the AC output signals of the said first and fourth electromagnetic pickups; a first counter using the pulse signal matching the output of the said first electromagnetic pickup as its counting input signal and the pulse matching the output of the said third electromagnetic pickup or its divided signal as a reset signal respectively; a second counter utilizing the pulse signal matching the output of the said second electromagnetic pickup as its counting input signal and the pulse signal matching the output of the said fourth electromagnetic pickup or its divided signal as a reset signal respectively; first and second decoders for decoding individually the computation of the said first and second counters; a flip-flop circuit for each toothed protuberance on the exterior circumference of each of the said first and second rotating discs individually set and reset with each set of matcHing output signals of the said first and second decoders; plural gate circuits corresponding in number to the said flip-flop circuits and controlled with the output signals therefrom; a reference pulse oscillator for producing and distributing the reference pulse signals to these gate circuits; delay circuits for varying the phase of each of the reference pulse signals distributed to each gate circuit; an ''''or'''' gate circuit for composing waves of the reference pulse signals having passed through each of the said gate circuits; a gate circuit installed at the output side of the said ''''or'''' gate circuit and put into a conducting state in an extremely long time width when compared with the period of the output signals of the said third and fourth electromagnetic pickups; and a counter for counting the number of pulse signals passing through the said gate circuit.

Claim 5

An angle measuring apparatus comprising first and second rotating discs of a magnetic material having the same number of toothed protuberances on their respective exterior circumferences; a motor causing the said first and second rotating discs to turn around a common shaft; first electromagnetic pickup fixed facing the exterior circumference of the said first rotating disc; a rotary shaft having the same center as that of the common rotary shaft for the said first and second rotating discs and being able to turn in accordance with the rotating angle of an object being measured without regard to the said common rotary shaft; second electromagnetic pickup being able to move along the exterior circumference of the said second rotating disc in accordance with the revolution of the said rotary shaft; a circuit for shaping pulse signals having repetition frequency and phase matching each of the AC output signals of the said first and second electromagnetic pickups; first and second ring counters utilizing individually the pulse signals of two systems matching the output of each of the said first and second electromagnetic pickups as their counting input and each said counters having the same number of steps; first and second decoders for decoding individually the computation of the first and second ring counters, at least one flip-flop circuit set and reset with at least one set of output signals matching the first and second decoders, at least one gate circuit installed for the said flip-flop circuit and controlled with the output signals of the said flip-flop circuit; a reference pulse oscillator for producing and delivering reference pulse signals to the said gate circuit; and a counter for counting the number of pulse signals passing through the said gate circuit.

Claim 6

An angle measuring apparatus comprising first and second rotating discs of a magnetic material having the same number of toothed protuberances on their respective exterior circumferences; a motor causing the said first and second rotating discs to turn around a common shaft; first electromagnetic pickup fixed facing the exterior circumference of the said first rotating disc; a rotary shaft having the same center as that of the common rotary shaft for the said first and second rotating discs and being able to turn in accordance with the rotating angle of an object being measured without regard to the said common rotary shaft; second electromagnetic pickup being able to move along the exterior circumference of the said second rotating disc in accordance with the revolution of the said rotary shaft; a circuit for shaping pulse signals having repetition frequency and phase matching each of the AC output signals of the said first and second electromagnetic pickups; first and second ring counters utilizing individually the pulse signals of two systems matching the output of each of the said first and second electromagnetic pickups as their counting input and each said counters having the same number of steps; first and second decoders for decoding individually the computation of the first and second ring counters, at least one flip-flop circuit set and reset with at least one set of output signals matching the first and second decoders, at least one gate circuit installed for the said flip-flop circuit and controlled with the output signals of the said flip-flop circuit; a reference pulse oscillator for producing and delivering reference pulse signals to the said gate circuit; and a counter for counting the number of pulse signals passing through the said gate circuit.

Claim 7

An angle measuring apparatus comprising first and second rotating discs of an opaque material having the same number of slits in a radius direction; the third and fourth rotating discs of a opaque material having the same plural number of slits in a radius direction; a motor causing at least the said first rotating disc to turn around a common rotary shaft; first light source and photoelectric converter fixed facing each other between the at least said first rotating disc; a gate circuit; third light source and photoelectric converter and means delivering the reference pulse signals from said converters to the said gate circuit, and a counter for counting the number of pulse signals passing through the said gate circuit.

Claim 8

An angle measuring apparatus comprising first and second rotating discs of an opaque material having the same number of slits in a radius direction; the third and fourth rotating discs of a opaque material having the same plural number of slits in a radius direction; a motor causing at least the said first rotating disc to turn around a common rotary shaft; first light source and photoelectric converter fixed facing each other between the at least said first rotating disc; a gate circuit; third light source and photoelectric converter and means delivering the reference pulse signals from said converters to the said gate circuit, and a counter for counting the number of pulse signals passing through the said gate circuit.