JPS6318926Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tote band type meter. More specifically, the present invention relates to a tote band type meter in which a movable part to which a pointer is attached is attached to a band fixed part, the movable part is rotated in response to a measurement signal, and the pointer indicates a measured value.

FIG. 1 is a diagram showing an example of the configuration of the main parts of a conventional tote band type meter.

In Fig. 1, 10 is a movable part, 20, 20'
is a band, 30 is a fixing part, and 40 is a scale plate.

In the movable part 10, 11 and 11' are an upper boss and a lower boss formed in a cylindrical shape. A pointer 12 is attached to one end of these bosses, and an excitation coil 13 is attached to the other end. 1
Reference numerals 4 and 14' designate band winding parts, which are, for example, pins having a diameter (0.5 mm) housed within the upper boss 11 and lower boss 11'. The pins 14, 14' are fixed in slot grooves 15, 15' provided in the upper boss 11 and lower boss 11', respectively. Bands 20, 20' are
They are wrapped around pins 14 and 14' respectively,
One end is soldered to the fittings 16, 16' of the movable part 10, and the other end is soldered to the fittings 31, 31' of the fixed part 30, respectively. With this, the movable part 1
0 is attached to the fixed part 30. mounting bracket 31,
A leaf spring 31' applies tension to the bands 20, 20'. 17, 17' are wedges inserted into the slotted grooves 15, 15', and the bands 20, 17' are wedges.
20' is pressed against the pins 14, 14' and fixed. Both ends of the excitation coil 13 are connected to bands 20, 2.
Connected to 0'.

In a tote band meter with such a configuration, the current according to the measurement signal is in band 20 or 2.
0' to the excitation coil 13, the excitation coil 13 is excited, and the movable part 10 is rotated around the band 20 by the magnetic force acting between it and the fixed part 30, and the pointer 12 is rotated around the scale plate. Indicates the value corresponding to the 40 measurement signals.

However, in such a tote band type meter, the pins 14 and 14' have a small diameter (0.5 mm), so when the movable part 10 vibrates in the A-A' direction due to external vibrations applied during transportation, the pins 14,
The relative position of 14' and bands 20, 20' changes from the state a to the state b of FIG. In such a variation, bands 20, 20' are connected to pins 14, 1
It can be bent using point c as a fulcrum without being bent along line 4'. Here, on the left side of point c, bands 20, 20' are fixed to pins 14, 14'. Therefore, when vibrations are repeatedly applied, the bands 20 and 20' suffer from fatigue failure at point c and become disconnected.

In order to prevent such fatigue failure of the band at point c, the diameter of the pins 14, 14' is increased so that the band bends along the pins when the movable part 10 vibrates. There were problems in that the height was increased and the overall shape became larger.

The present invention was made to eliminate the above-mentioned problems, and is a compact tote band type meter that is designed to prevent band breakage caused by vibration of the movable part due to the bent shape of the band. The aim is to realize this in the form of

FIG. 3 is a diagram showing the configuration of essential parts of an embodiment of the tote band type meter according to the present invention. Fourth
The figure is a sectional view taken along line XX' in FIG. 3. In these figures, the same parts as in FIG. 1 are given the same reference numerals. The same applies to the figures below.

In these figures, 50 is a movable part.

In the movable part 50, 51 and 51' are an upper boss and a lower boss formed in a cylindrical shape. Slit grooves 52 and 52' and stepped portions 53 and 53' are formed in the upper boss 51 and lower boss 51'. A pointer 12 is attached to one end of these bosses, and an excitation coil 13 is attached to the other end. Reference numerals 54 and 54' denote band wrapping parts, which are, for example, rectangular members formed in a rectangular shape. A part of the rectangular members 54, 54' has arcuate parts 55, 5.
5' is formed, and grooves 56, 56' are provided on the side surfaces. The rectangular members 54, 54' are inserted into the slotted grooves 52, 52', and the circular arc parts 55,
Bands 20, 20' are wrapped around a portion of 55', and fixing rings 57, 57' are inserted into grooves 56, 56'. The fixing rings 57, 57' are fixed to the upper boss 51 and the lower boss 51' by fitting into the stepped portions 53, 53' and caulking them. As a result, the rectangular members 54, 54'
are fixed within the slotted grooves 52, 52'.
The wedges 17, 17' are inserted into the slots 52, 52' and press and secure the bands 20, 20' against the rectangular members 54, 54'. Furthermore, the wedges 17, 17' are rectangular members 54, 5.
4' is pressed against the fixing rings 57, 57' to more securely fix the rectangular members 54, 54'.

In the tote band type meter having such a configuration, the pointer 11 indicates a value corresponding to the measurement signal in the same manner as in the tote band type meter shown in FIG.

In addition, the bands 20 and 2 due to the vibration of the movable part 50
0' fatigue failure is prevented as follows.

Bands 20, 20' are fixed to rectangular members 54, 54' on the left side of point d in FIG. When external vibration or the like is applied to the meter, the movable part 50 vibrates in the A-A' direction to the extent that the upper boss 51 and lower boss 51' touch the fixed part 30. Due to this vibration, the relative positions of the bands 20, 20' and the rectangular members 54, 54' change to the states shown in FIG. 5 from e to f.

The left end of the upper boss 51 and lower boss 51' is the fixed part 30
When hit, the relative positions of bands 20, 20' and rectangular members 54, 54' are as shown in FIG. 5e. In this state, bands 20, 2
0' is not bent along the arcuate portions 55, 55'.

On the other hand, when the right ends of the upper boss 51 and lower boss 51' touch the fixing part 30, the relative positions of the bands 20, 20' and the rectangular members 54, 54' are at f in FIG.
The state shown in is reached. In this state, band 20,
20' is bent along arcuate portions 55, 55' between point d and point g.

When vibration is applied in this way, band 2
Since the bands 0 and 20' are bent along the arc parts 55 and 55', repeated bending stress due to vibration is applied to the band 2.
Concentration at one point (point d) between 0 and 20' is prevented. This prevents the band from breaking due to vibration.

Here, the radius of curvature of the circular arc parts 55, 55' is calculated by the following theoretical calculation so that when the movable part 50 vibrates, the bands 20, 20' are bent along the circular arc parts 55, 55'. I ask for it.

The radius of curvature r of the bands 20, 20' when the upper boss 51 and the lower boss 51' contact the fixed part 30 is given by the following equation.

Here, l: Total length of bands 20 and 20' that do not touch the arcuate parts 55, 55' in a stationary state δ: Gap distance between the upper boss 51, lower boss 51' and the fixing member 30 in a stationary state E :Longitudinal elastic modulus of bands 20, 20' I: Moment of inertia of area of bands 20, 20' T: Tension applied to bands 20, 20'
This is the minimum radius of curvature of the band 20, 20' when the band is suspended. The movable part 50 is A-
When the bands 20, 20' vibrate in the A' direction, the bands 20, 20' hit the circular arc parts 55, 55', and the bands 20, 20'
The radius of curvature of the circular arc parts 55, 55' is bent along the circular arc parts 55, 55' so that the radius of curvature of the circular arc parts 55, 55' is
20' is set to be larger than the minimum radius of curvature r.

Also, when the bands 20, 20' separate, if the radius of curvature of the circular arc portions 55, 55' is 1.5 mm, the band 20, 20' separates as shown in Fig. 6A (the separation occurs at point h), This is no different from the pin with a radius of 1.5 mm as shown in Figure 6 (b) (the point at which this pin separates is point k). Even though the distance between the rectangular members 54 and 54' is the same, the arcuate portions of the rectangular members 54 and 54' are only partially formed, so that the dimension in the height direction is reduced as shown in the figure.

According to the tote band type meter having such a configuration, when the movable part 50 vibrates, the band 20,
20' is bent along the arcuate portions 55, 55', and repeated bending stress due to vibration is applied to the bands 20, 20'.
concentration in one place is prevented. Therefore, it is possible to prevent the bands 20, 20' from breaking due to vibration. Further, the arcuate portions 55, 55' are formed only in the portions where the bands 20, 20' are bent along the arcuate portions 55, 55', and the band wrapping portions 54, 54' are formed in a rectangular shape. Even if the radius of curvature of the arcuate portions 55, 55' is large, the dimensions in the height direction of the rectangular members 54, 54' do not increase. Thereby, the overall shape can be reduced in size.

In the embodiment, the band support parts 54, 54' are attached to the upper boss 51 and the lower boss 51' by the fixing rings 57, 5.
We have explained the case where it is fixed by 7'.
However, the present invention is not limited to this, and the band support parts 54, 54', the upper boss 51, and the lower boss 51' may be integrally formed by molding resin, for example.
This eliminates the need for fixing rings 57, 57', allowing the number of parts to be reduced.

As explained above, according to the present invention, it is possible to realize a small-sized tote band type meter in which breakage of the band caused by vibration of the movable part is prevented by design due to the bent shape of the band.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of the configuration of the main parts of a conventional tote band type meter, Fig. 2 is a diagram showing the relative position of the band of the tote band type meter of Fig. 1 and the band winding part, and Fig. 3 The figure shows the configuration of the main parts of an embodiment of the tote band type meter according to the present invention, FIG. 4 is a sectional view taken along the line X-X' in FIG. 3, and FIG. FIG. 6 is a diagram showing the relative position of the band of the band-type meter and the band winding part, and FIG. 6 is a diagram showing the point at which the band is separated from the band winding part. 11... Pointer, 20, 20'... Band, 30
...Fixed part, 50...Movable part, 54, 54'...
Band winding part, 55, 55'... arc part.

Claims (1)

[Scope of Claim for Utility Model Registration] A band winding part is provided on the movable part to which the pointer is attached, a band is wound around the band winding part to hook the movable part to the fixed part, and the movable part is moved in response to a measurement signal. In a tote band type meter which is rotated and the pointer indicates a measured value, an arc portion having a radius of curvature equal to or greater than the minimum radius of curvature of the bend that occurs in the band when the movable part is hooked is A tote band type meter, characterized in that the band is formed in a part of the hanging part, and the band is bent along the arcuate part when the movable part vibrates.