JPS58160812A - Metering device - Google Patents

Abstract

PURPOSE:To reduce electric power consumption and to obtain a titled device which is suitable as a metering device with an electronic meter, by constituting the device in uch a way that the supply currents to motor coils are subjected to switching control according to the revolutions of a shielding disc whereby the metering operation by a pulse motor is accomplished. CONSTITUTION:Switching circuits 11a-11c are connected in series respectively through diodes 7a-7c to motor coils 4a-4b of a pulse motor to control the supply of the driving currents to the respective motor coils. A photointerruptor 12 is used in the circuit 11a, which is connected in series with a light emitting diode LD 1 and a phototransistor PTr 1 and is provided with a transistor Tr 3 Darlington-connected to the PTr 1. A high resistor R 7 for limiting current is connected in parallel with said circuit. The light emitting diode LD 1 of the photointerruptor 12 and the phototransistor DTr 1 are disposed opposite to each other so as to face the rotating passage for the projecting parts 1b of the photointerruptor 12. The switching operation is accomplished in accordance with the revolutions of a shielding disc 1 which rotates according to the quantity to be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotor that rotates in accordance with the amount to be measured, and provides a shielding disk, and alternately provides missing portions and protruding portions on the periphery of the shielding disk. A pair of switching elements f arranged opposite to each other in the rotation path of the projection of the shielding disk:
The missing part and the protruding part of the tjahei disc perform a switching action, and this switching action allows the quantity to be measured to be proportionally measured. This is a suitable conditioner fc.

Conventionally, there have been devices of this type shown in FIGS. 1 to 3. In FIG. Projection (1
b) are formed alternately with n-shaped discs, and this flexible disc (1) has nine pairs of n-shaped discs arranged facing each other so as to face the rotation path of the protrusion (11) J. A switching circuit (22) is provided with a switching element consisting of a pulse motor circuit (8) which proportionally moves the measured quantity as shown in FIG. Each motor coil (4aJ~(4) is provided in correspondence with each other, and each switching circuit (2aJ~(2C)
Each motor coil ( 4
It is connected in series to a) to (4C) via diodes (7a) to (7C) and is provided in the direct current supply path, and its switching operation, that is, the amount of rotation that rotates according to the measured quantity. It is designed to control the supply of drive current to the top motor coil (4) according to the following, and the specific configuration shown in FIG. 6 is shown in each case.

In FIG. 3, for example, the switching circuit (g) includes oscillation coils -1, L2, . Resistors R1 to R4, capacitors 01 to C5, and transistors Tr1. Tr2 consists of an anti-coupling oscillation circuit consisting of n1 oscillation coils L1 and L2.
and the protrusion of the flexible disc (1) that rotates in accordance with the measured quantity (1bρ) are arranged facing each other so as to face the rotation path, and are connected to the terminals R1 and RO of the terminal '1sCOtji2Q to connect the motor coil to the motor coil. (4a) provided in the current supply path n
It is designed to receive power supply from a DC power supply (6) through the switching operation of the transistor Tr2, and control the supply of drive current to the motor coil (4) so that proportional measurement of the measured quantity is performed. In other words,
The protruding part of the flexible disc (1) (1b) facing the rotation path of J is the missing part of the flexible disc (1) rotating between the oscillation coils L1 and II2 arranged opposite (When 10 intervenes, the oscillation coil L2 oscillates, transistor Tr1 becomes conductive, and a pulse is supplied to the base of transistor Tr2 via capacitor C5. Then the direct current fIt' from the DC power supply (6) is applied to the motor coil (4a) in Fig. 2.
When the IIL current flows n1 and the protrusion of the interfering disk (1) exists between the oscillation coil T,+1 and L2, the oscillation coil L2 stops oscillating and the transistor Tr1 becomes disabled. The transistor Tr2 becomes conductive, and then the transistor Tr2 becomes non-conductive, and no DC current flt is supplied to the starting coil (4a).In this way, the oscillation coil repeats oscillation and stopping depending on the presence or absence of the missing portion (1b). The switching circuit (2a) changes the amount of rotation of the shielding disk (2), which rotates in accordance with the amount to be measured, and accordingly performs all switching operations to drive the motor coil (4a).
The supply of the flow is controlled and the metering operation is performed by the pulse motor (4).

However, the switching circuit (2a) shown in FIG. 3, that is, the nine-anticoupled oscillation circuit arranged opposite to the rotation path of the oscillation coil L1@L2tL and the disk (1), is complex with a large number of components, and is difficult to oscillate. Coil r, +1, L2 t”L
The outer diameter of the disc (1) must be made large in order to oscillate and stop the oscillation because they must be placed facing each other on the disc (1). In addition to increasing the outer diameter of the stiff disk (1), its weight also increases and a load is applied to the rotor, making installation and workability difficult and resulting in a high price. It was also disadvantageous.

Figure 4.5 shows a conventional switching circuit (8) which was designed to solve the above-mentioned problem.In place of the oscillation coil in Figure 5, a light emitting diode LD is used.
1 to LD3: Phototransistor Prr1 to PTr
The pairs of phototransistors PTr1 to PTrs are arranged to face each other in the rotation path of the protruding portion (11) of the flexible disc (1), and are electrically connected to the phototransistors PTr1 to PTrs according to the rotation of the flexible disc (1). The supply of current is controlled to the peak coils (4a) to (4) in FIG.

That is, as shown in Fig. 4, this switching circuit (8
), the light emitting diodes LI)1 to I, D3 are connected in series, and the lighting current from the DC power supply αQ which rectifies this DC fluid-AC power supply (9) is always supplied via the resistor R5t. In accordance with the rotation of the disk (1), the phototransistors PTr1 to PTr5 are switched to control the supply of DC current to the motor coils (4a) to (4bJ) in Figure #I2. A light emitting diode LDI is installed in the missing part (1a) of the Yahei disk (1).
When ~LD3 and phototransistors PTrl~PTr3 are arranged facing each other, the pulse motor coil (4a)
~ (4oU, DC power supply (6) [current power supply (+) - pulse starting coil (4aJ ~ (4 lead diode (7a)
~(7ri-phototransistor PTrl~PTr3
The pulse motor (4) is operated by receiving the excitation operating current through the path of the DC power source (II). On the other hand, light emitting diodes IJI) 1 to LD5 and 7 phototransistors PTr1 to PTr3 are arranged opposite to the protrusion (1b) of the thin disc (1), and the spinning current path is connected to the phototransistors Prr1 to PTr3. The current flowing through the pulse motor coils (4aJ to (4C)) is blocked by pTr3, and such a switching circuit (8)
By this operation, the pulse motor performs a metering operation.

However, the switching circuit (8) having the configuration shown in FIG. It required a large amount of power, making it uneconomical. Furthermore, in addition to this, the constant current supply to the light emitting diode shortens the life of the light emitting diode,
It also had the disadvantage of being uneconomical in terms of power consumption.

Therefore, the present invention has been made in order to eliminate the drawbacks of the conventional example shown in FIGS. 1 to 5 and #I4-5, and
The purpose is to improve the lifespan of components and reduce power consumption with a simple and inexpensive circuit configuration, and in order to achieve these objectives, 1. A switching circuit is constructed by connecting the nine light-emitting light-emitting elements in series, and connecting the nuclear light-receiving element in parallel with a resistor for limiting the current flowing to the light-emitting element. And this swing, ching circuit t-, straight a
a pulse motor circuit which is excited by a tt source and performs a metering operation according to the amount to be measured; connected in series with each motor coil; a protruding portion of a flexible disc on which the light emitting element and the light receiving element rotate; When they are placed facing each other, the current flowing from the DC power source to the light emitting element via the motor coil is limited by a small amount of current through the resistor γL7 connected in parallel to the light receiving element, and on the other hand, the current flowing from the light emitting element to the light emitting element is and when the light receiving element is disposed opposite to the missing portion of the shielding disk, a drive current is supplied to the motor coil through conduction of the light receiving element that performs switching operation. This is what we provide.

Hereinafter, one embodiment of the present invention will be explained based on FIG. 6, FIG. 2, and FIG. 5. FIG. ) of the pulse motor shown in Figure 2.
a) to (4b) and each switching circuit (11a
) to (11) are connected in series via diodes (7a) to (70) to control the supply of drive current to the can motor coil. ) using light emitting diode LD1 and phototransistor PTr.
1 are connected in series, and a transistor Tr3 is connected to a darlington transistor PTr1, and a high resistance R7 for current limiting is connected in parallel to the pulse motor coil ( 4a) is connected in series to receive the supply of DC power supply (6),
The switching circuit (1119° (11aJ) has a similar configuration.

The light emitting diode and phototransistor of the two photointerceptors are arranged facing each other so as to face the rotation path of the protrusion (1b) of the flexible disc (1), as in the embodiment shown in FIG. The switching operation is performed according to the rotation of the interference disk (1), which rotates in accordance with the amount to be measured.

That is, first, the light emitting diode LD1 and the phototransistor PTr1 are connected to the protrusion (1) of the flexible disc (1).
b) When the light emitting diode LD1 is in a state where they are arranged facing each other with intervening wires, the light emitting diode LD1 is connected to the DC power supply (+) from the DC power supply (6) in FIG. -Light emitting diode LD1 -Resistance R7-
The pulse motor coil (4
A current of 2" determined by the input diode (7a) and resistor R7 is flowing, but the light to the phototransistor PTrl is too strong, so the transistor Tr3 does not turn on, and the pulse motor coil (4a) 'Then, when the thin disc (1) rotates and there is a missing part (1) between the light emitting diode LD1 and the phototransistor FTlr1, the above-mentioned small current is supplied to the The light from the light emitting diode LD1 is supplied to the phototransistor PTrlK fl and the phototransistor PTr
1 and transistor Tr3, the light emitting diode LD1 and the pulse motor coil (4aJ
The current flowing through n suddenly decreases and increases, and the DC tlIL source (6) causes the DC power source (+) to pulse motor coil (4a
J-diode (7a)-light emitting diode LD1-1
Through the path of transistor Tr5 - resistor R7 - DC power supply (-), tR approximately determined by the power supply voltage and motor coil (4a) flows through the motor coil (4a).

Then, if the flexible disc (1) rotates and blocks the light between the light emitting diode LD1 and the phototransistor PTr1, the transistor Tr3
is not turned on, and only n+minor current f'L flows through the pulse motor coil (7a), determined by the motor coil (4a) and the diode (7a) and the resistor R7.

In this way, following the rotation of the flexible disk (1), the current supplied to the motor coil is controlled by switching, and the metering operation by the pulse motor is performed.

Therefore, the present invention can reduce the number of parts and is advantageous in terms of cost and space compared to the conventional switching circuit shown in FIG. Compared to the pulse motor circuit, there is no need to provide a separate power supply, so it has great economical and space-saving effects, and there is no need to continuously light up the five light-emitting elements, improving the life of the elements and reducing power consumption. It also improves reliability.

In addition, in FIG. 7, a delay circuit including a diode D1, a capacitor C7, and a resistor R6 is installed at the input terminal to the Darlington-connected zero-order transistor Tr3 for the switching circuit (b) of FIG. 6. This shows a switching circuit according to another embodiment of the present invention, which includes a rotating flexible disc (
1) The switching operation by the missing m (1aJ) and the protrusion (1bJ) can be ensured.

What? Although the above embodiments have described controlling the current supplied to the motor coil of a pulse motor as a metering operation, the present invention is not limited to this. 10. For example, it is of course possible to implement the loJ method in a case where measurement is performed using a counter coil or a resistor instead of the motor coil of a pulse motor.

As described above, if the present invention is implemented, 4. A light-emitting element and a light-receiving element arranged opposite each other are connected in series so as to face the rotational path of the protrusion. These switching circuits are connected in parallel to form a switching circuit tM, and this switching circuit is connected in series to each motor coil of a pulse motor circuit that receives DC power supply, is excited, and performs measurement according to the measured quantity. When a light-emitting element and a light-receiving element are arranged facing each other at the protrusion of a rotating flexible disk, a current flowing from the DC power source to the light-emitting element via the motor coil is connected in parallel to the light-receiving element and then While limiting a small current using a resistor, on the other hand, when the light-emitting element and the light-receiving confectionery are placed facing each other in the missing portion of the shielding disk, a drive current is supplied to the motor coil in order to conduct the light-receiving element that performs switching operation. Because of this structure, the circuit 41 is easy to construct.
In addition, a weighing device that is inexpensive and can improve the life of components and reduce power consumption can be obtained.

[Brief explanation of the drawing]

1 and 2 are a block diagram showing the configuration of a shielding disk and the overall configuration of a measuring device, which are used to explain a conventional example and the present invention. FIG. Figure M4 is a circuit diagram showing a conventional switching circuit constructed using a light-emitting element and a light-receiving element. Figure 5 is a circuit diagram showing a conventional switching circuit constructed using a light-emitting element and a light-receiving element. Figures 6 and 7 are schematic diagrams showing switching circuits according to each embodiment of the present invention. ) *(2a) to (2'b), (8)t C11)
, (11a) to (11'b)t (111+l Niswitching circuit (8): Pulse motor circuit (4), (4a) to (40): Motor coil (6) Two DC power supplies LD[~LD3: Light emitting diode PTr1 ~pTre: Phototransistor Tr3:) Transistor D: Diode C7: Capacitor R7: Resistor In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 4 Figure 5 Figure 6 Figure 7 Figure 1 Procedural amendment (spontaneous) Commissioner of the Japan Patent Office 1, Indication of case Patent Application No. 57-43315 2,
Name of the invention Measuring device 3, Person making the amendment Representative Hitoshi Katayama Department 4, Agent → 5, Detailed description of the invention in the specification to be amended. 6. In the 13th page, line 11 of the Specification of Contents of Amendment, the statement "Of course." It may be used instead of.'' Less than 1゜

Claims (1)

[Claims] (1) G provided on a rotor that rotates according to the amount to be measured. Missing portions and protruding portions are alternately formed on the peripheral edge of the disc, and are arranged facing each other so as to face the rotation path of the axillary protruding portion.
A switching circuit is constructed by connecting a light-emitting element and a light-receiving element in series, and a resistor for limiting cardiac current to the light-receiving element is connected in parallel to the light-receiving element. The light-emitting element and the light-receiving element are arranged facing each other at the protruding part of the rotating interference disk. At nine o'clock, the current flowing from the DC power source to the light emitting element via the motor coil is limited by a resistor connected in parallel to the light receiving element, and on the other hand, the current flowing through the light emitting element and the light receiving element is limited. 2. A measuring device characterized in that, when disposed facing the missing portion of the shielding disk, the M motor coil drive current is supplied by conduction of a light receiving element that performs a switching operation. (2) The measuring device according to claim 1, further comprising a delay means for delaying the switching operation of the switching circuit for a predetermined period of time. (8) The measuring device according to claim 1, wherein a light emitting diode is used as the light emitting element, a phototransistor is used as the light receiving element, and the phototransistor is used as a Darlington connection circuit.