JPH0449535Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electronic edge-type meter relay, and more particularly to a mechanism for preventing twisting and bending of a measured value setting arm in an edge-type meter.

Conventional technology Photoelectric relays and high-frequency relays that use proximity relays to detect the deflection angle of the movable pointer of the indicator as meter relays, and resistors that use potentiometers (variable resistors) to detect the relay operating point (upper limit value, lower limit value, etc.) value)
An electronic relay that sets the

This electronic relay sets the relay operating point using a potentiometer (variable resistor) that works in conjunction with a setting arm that has a setting indicator that moves on a scale plate. The measuring circuit of this electronic relay (the relay circuit connected to the mechanism part), which has a comparison circuit, converts this set resistance value into an electrical quantity (voltage) and gives it to the indicating mechanism (meter part with a pointer). Compare with the amount of electricity to be measured. Then, when the amount of electricity to be measured reaches the amount of electricity corresponding to the set relay operating point, an ON/OFF relay output is generated. The proximity relay system uses a narrow-angle indicator 1, a wide-angle indicator 2, or an edge-shaped indicator as shown in Figure 4 as a relay that can read the indicated value and set value on the same scale plate without interfering with the movement of the movable pointer. Its usefulness has been evaluated with indicators such as indicator 3. By the way, the edge-shaped indicator 3 with a built-in proximity relay detects the movement of the movable pointer 5 with a detection section of the proximity relay and outputs a relay signal, and also sets the setting indicator 4 disposed in the detection section to the edge. The setting value can be read by cooperating with the movable pointer 5 on the scale plate 6 of the indicator 3. That is, the edge-shaped indicator 3 is generally configured to output a relay signal when the indicated value of the movable pointer 5 reaches the same position as the setting indicator 4.

On the other hand, the edge-shaped indicator with built-in electronic relay is
Since it does not use a shielding plate like that found in proximity relays, there is less influence of inertia during operation, and by configuring a simple detection and setting system with few moving parts, the service life of proximity relays is longer than that of proximity relays. We have succeeded in extending the comparison.

Problems to be Solved by the Invention However, in the conventional edge-shaped indicator 3 incorporating a proximity relay, a shielding plate (not shown) is attached to the movable pointer 5, so the movable part including the movable pointer 5 It has been recognized that there are disadvantages in that the damping performance of the engine is reduced and the indicated speed at which critical braking is applied becomes slower. Furthermore, when operating setting index 4, the lead wires connected to the light emitting part and the light receiving part in photoelectric relays, and the lead wires of the high frequency coil in high frequency relays, generate sliding resistance, which impairs the smoothness of the operation. Therefore, if an attempt is made to avoid this problem, the structure of the edge-shaped indicator becomes complicated, which greatly limits the ability to make the indicator more compact. On the other hand, conventional electronic relays have structural difficulties in matching the reading on the meter and the rotation angle of the resistance value adjustment device, and there is a possibility that the setting arm may be bent or bent between the set value and the reading. There is a risk that measurement errors may occur due to poor fitting accuracy of the shaft portion of the setting mechanism.

The present invention solves the above-mentioned problems with conventional edge-type meter relays that incorporate electronic relays or proximity relays.The present invention is a simple, compact edge-type meter relay with good measurement accuracy and a small number of measuring equipment components. The aim is to provide meter relays.

Means for Solving the Problems In view of the above object, the present invention provides a meter element into which a quantity of electricity to be measured is input and which angularly displaces a movable pointer in accordance with the input value, and a meter element which is arranged facing the mounting plate of the meter element. a variable resistor, which is fixed to the printed circuit board and whose resistance value sets a relay operating point to be compared with the quantity of electricity to be measured; a cylindrical shaft,
It is made of a thin plate-like member, has a setting index attachment part at the tip, has a large gear meshing with a pinion provided in the variable resistor at the base end, and is rotatable about the cylindrical shaft between the tip and base ends. Provided is a mechanical section of an edge-shaped meter relay, comprising a supported measured value setting arm, and a meshing point between a large gear and a pinion is located on a rotational displacement surface of the measured value setting arm. It is something to do.

Function: The instrument element and the cylindrical shaft are supported on the same axis, and the large gear and the large gear are mounted on the rotational displacement surface of the weighing value setting arm molded from a thin plate-shaped material rotatably supported on the cylindrical shaft. By locating the engagement point with the pinion, twisting and bending of the weight value setting arm is prevented, and the weight value setting arm is connected to the variable resistor from the large gear formed at the base end of the weight value setting arm. To configure an edge-shaped meter relay that transmits movement with high precision.

Embodiment Hereinafter, the mechanical part of the electronic edge-type meter relay, which is the content of the present invention, will be explained. Note that the structure and operation of the measurement circuit (relay circuit connected to the mechanism section) whose relay operating point is set by the variable resistor of this mechanism section are the same as those of the conventional one, and therefore the explanation thereof will be omitted.

FIG. 1 is a longitudinal sectional view of the edge-shaped meter relay according to the present invention, and FIG. 2 is a plan view of the edge-shaped meter relay with the cover 26 removed. Also, Figure 3 AB
1 is a plan view of a measurement value setting arm. As seen in these drawings, the instrument element 1 with a magnetic yoke
0 constitutes a meter relay, and the cylindrical shaft 11
It is fixed on the mounting plate 12 with the axes aligned with each other. Two measurement value setting arms 13 and 14 manufactured by punching and forming thin metal sheets are rotatably supported on the cylindrical shaft 11 with a loose fit, and each has a scale plate 18 at its tip facing the other. Setting indicators 19a and 19b each having an L-shaped cross section are fixedly attached. On the other hand, the movable pointer 15 is formed from a thin needle-like member with low inertia so that it can quickly make an angular displacement according to the measured value, and is attached to the cylinder with its axis aligned with the cylindrical shaft 11. It is swingably supported on a shaft. In addition, reference number 16 in the figure indicates a printed circuit board built into the edge-shaped meter relay.
Reference numbers 17 and 25 refer to this printed circuit board 16
shows a variable resistor connected to. In the edge-shaped meter relay according to the present invention, as shown in FIG. While configuring the gears 20 and 21,
Output shafts 17a, 25 of the variable resistors 17, 25
Pinions 22, 2 meshing with large gears 20, 21 at a.
3 is fixed. In this way, the meter element 10
and the cylindrical shaft 11 on the same axis, and at the same time, by selecting the shapes of the weighing value setting arms 13 and 14, the first The meshing points of the large gear 20 and the first pinion 22 and the meshing points of the second large gear 21 and the second pinion 23 are located.

Prior to using the edge-shaped meter relay, manually operate the tips of the measured value setting arms 13, 14 that protrude outside the meter body 24, and set the indicators 19a, 19b, 1.
The setting conditions of the weighing values are adjusted so that 3a and 14a indicate the upper limit value and lower limit value, respectively, on the scale plate 18. By this manual operation, the weighing value setting arm 1
3 and 14 rotate around the common rotation axis 11, the output shafts 17a of the variable resistors 17 and 25 are , 25a are rotated by a predetermined angle, and a resistance value (relay operating point) corresponding to the set value is set in a measuring circuit (relay circuit, not shown), thereby enabling relay operation. In this state, the metering operation by the edge-shaped meter relay is started.

Effects of the invention As can be understood from the above explanation, the measuring device is formed from a thin plate-shaped material that supports the instrument element and the cylindrical shaft on the same axis, and is rotatably supported on the cylindrical shaft with a loose fit. By locating the engagement point between the large impeller and pinion to change the resistance value of the variable resistor in accordance with the set value on the rotational displacement surface of the value setting arm, the weighing value can be set during manual operation. A resistance value adjustment mechanism with no twisting or bending of the arm is formed. As a result, the rigidity of the edge-shaped meter relay is improved, and an edge-shaped meter relay is constructed that can accurately transmit the movement of the measured value setting arm to the variable resistor. The edge-shaped meter relay according to the present invention is
By adopting the above structure, the meter relay main body can be made compact and thin, and high measurement accuracy can be guaranteed over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the edge-shaped meter relay according to the present invention, and FIG. 2 is a plan view of the edge-shaped meter relay with the cover removed. Also, Figure 3 AB
1 is a plan view of a measurement value setting arm. FIG. 4 is a schematic perspective view of a conventional indicator. 10... Instrument element, 11... Cylindrical shaft, 12...
Mounting plate, 13, 14...Weighing value setting arm, 15...
Movable pointer, 20, 21... Large gear, 16... Printed circuit board, 17... Variable resistor, 22, 23...
pinion.

Claims (1)

[Scope of Claim for Utility Model Registration] A meter element into which a quantity of electricity to be measured is input and which angularly displaces a movable pointer according to the input value; a variable resistor that sets a relay operating point to be compared with the amount of electricity to be measured using a resistance value; a cylindrical shaft whose axis is aligned with the rotation center of the movable pointer and which is fixed to the mounting plate; and a thin plate-shaped member. A metering device having a setting index attachment part at the tip, a large gear meshing with a pinion provided on the variable resistor at the base end, and rotatably supported on the cylindrical shaft between the tip and the base end. A mechanical part of an edge-shaped meter relay, comprising: a value setting arm, and a meshing point between the large gear and the pinion is located on a rotational displacement surface of the measured value setting arm.