Electrical configuration for object detection system in a saw
First Claim
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1. A detection system for detecting contact between an implement in a saw and an object comprising:
- an electrically conductive plate positioned at a predetermined distance from the implement;
an implement reaction mechanism operatively connected to the implement;
a detection circuit comprising;
a transformer, the transformer further comprising;
a first winding formed from a first electrical conductor between a first terminal and a second terminal; and
a second winding formed from a second electrical conductor between a third terminal and a fourth terminal;
a first thyristor electrically connected to the third terminal of the second winding;
a first demodulator electrically connected to the first thyristor;
a second thyristor electrically connected to the fourth terminal of the second winding;
a second demodulator electrically connected to the second thyristor;
a clock generator electrically connected to the first winding, the clock generator being configured to generate a sensing signal through the first winding at a predetermined frequency; and
a controller operatively connected to the implement reaction mechanism, the controller being configured to;
receive an in-phase signal from the first demodulator and a quadrature-phase signal from the second demodulator;
identify a spike in the sensing signal with reference to the in-phase signal from the first demodulator and the quadrature-phase signal from the second demodulator; and
generate a control signal to operate the implement reaction mechanism in response to identification of the spike; and
a single cable connecting the first terminal and the second terminal of the winding to the charge plate and the implement, the single cable comprising;
a first conductor electrically connected to the first terminal of the winding and to the electrically conductive plate;
a second conductor electrically connected to the second terminal of the winding and to the implement; and
an electrical insulator positioned between the first conductor and the second conductor.
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Abstract
An object detection system in a saw includes an electrically conductive plate positioned at a predetermined distance from the implement, a detection circuit comprising a transformer, and a single cable connecting first terminal and second terminals of the transformer. The single cable includes a first conductor electrically connected to the first terminal of the winding and to the electrically conductive plate, a second conductor electrically connected to the implement, and an electrical insulator positioned between the first conductor and the second conductor.
131 Citations
13 Claims
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1. A detection system for detecting contact between an implement in a saw and an object comprising:
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an electrically conductive plate positioned at a predetermined distance from the implement; an implement reaction mechanism operatively connected to the implement; a detection circuit comprising; a transformer, the transformer further comprising; a first winding formed from a first electrical conductor between a first terminal and a second terminal; and a second winding formed from a second electrical conductor between a third terminal and a fourth terminal; a first thyristor electrically connected to the third terminal of the second winding; a first demodulator electrically connected to the first thyristor; a second thyristor electrically connected to the fourth terminal of the second winding; a second demodulator electrically connected to the second thyristor; a clock generator electrically connected to the first winding, the clock generator being configured to generate a sensing signal through the first winding at a predetermined frequency; and a controller operatively connected to the implement reaction mechanism, the controller being configured to; receive an in-phase signal from the first demodulator and a quadrature-phase signal from the second demodulator; identify a spike in the sensing signal with reference to the in-phase signal from the first demodulator and the quadrature-phase signal from the second demodulator; and generate a control signal to operate the implement reaction mechanism in response to identification of the spike; and a single cable connecting the first terminal and the second terminal of the winding to the charge plate and the implement, the single cable comprising; a first conductor electrically connected to the first terminal of the winding and to the electrically conductive plate; a second conductor electrically connected to the second terminal of the winding and to the implement; and an electrical insulator positioned between the first conductor and the second conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification