摘要:
A vertical spindle duplex head for a grinder includes an annular pressure wheel and a receiver wheel arranged to rotate and revolve workpieces between the annular surfaces of the pressure wheel and the receiver wheel and a grindstone for one end portion of the workpieces driven in the opposite directions of rotation of the pressure wheel and receiver wheel and at their different rotational ratios. The workpieces rotate and revolve between these wheels, thereby grinding their end face by means of a grindstone arranged around the external periphery of a rotary carrier.The pressure wheel and receiver wheel are rotatably driven in opposite directions and at their different rotational speeds by distributing driving force from one source to each of them and a variable driving means is provided on one of the transmittance routes of the driving force extending from the place of distributing the driving force to both of the pressure wheel and the receiver wheel, whereby the rotational ratio of each of them can be optionally changed.
摘要:
A device for testing the voltage of a voltage source comprises a bridge circuit, a differential switching circuit and an indicator element. The bridge circuit includes a first circuit comprising a first resistor; a second circuit comprising first diode means connected to the first circuit; a third circuit comprising a second resistor connected to the first circuit, the junction between the third and first circuits being connected to one terminal of the voltage source; and a fourth circuit comprising a serial connection of second diode means and a third resistor. One end of the fourth circuit is connected to the third circuit and the other end is connected to the second circuit. The junction between the fourth and second circuits is connected to the other terminal of the voltage source. The third resistor has a resistance value sufficiently great so that the differential voltage between the junction between the first and second circuits and the junction between the third and fourth circuits depends on the source voltage. The differential switching circuit is adapted to change its condition in accordance with the differential voltage between the junction between the first and second circuits and the junction between the third and fourth circuits. The switching circuit has a terminal for outputting the condition thereof. The indicator element is connected to the output terminal to indicate the condition of the differential switching circuit.
摘要:
A device for testing the voltage of a voltage source comprises a bridge circuit, a differential switching circuit and an indicator element. The bridge circuit includes a first circuit comprising a first resistor; a second circuit comprising first diode means connected to the first circuit; a third circuit comprising a second resistor connected to the first circuit, the junction between the third and first circuits being connected to one terminal of the voltage source; and a fourth circuit comprising a serial connection of second diode means and a third resistor. One end of the fourth circuit is connected to the third circuit and the other end is connected to the second circuit. The junction between the fourth and second circuits is connected to the other terminal of the voltage source. The third resistor has a resistance value sufficiently great so that the differential voltage between the junction between the first and second circuits and the junction between the third and fourth circuits depends on the source voltage. The differential switching circuit is adapted to change its condition in accordance with the differential voltage between the junction between the first and second circuits and the junction between the third and fourth circuits. The switching circuit has a terminal for outputting the condition thereof. The indicator element is connected to the output terminal to indicate the condition of the differential switching circuit.