JPS58176525A - Method for adjusting uneven placement error in electrostatic capacity type balance - Google Patents

Abstract

PURPOSE:To enable the simple adjustment of compensation and to measure with high accuracy, by making either one of two sheets of parallel electrodes freely tiltable longitudinally or laterally thereby making an uneven placement error compensable. CONSTITUTION:A stationary electrode plate 5 is fixed to a channel A which is fixed to a base plate 1. On the other hand, a movable electrode plate 11 is fixed so as to face the plate 5 in parallel therewith to a channel B which is made movable with a leaf spring 6 or coil spring when loaded with a weight. The change in the electrostatic capacity generated between both electrodes 5 and 11 is measured and the weight is displaced in accordance with said change. Either one of two sheets of the parallel electrode plates 5, 11 is made freely tiltable longitudinally or laterally. The compensation of an uneven placement error is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adjusting eccentricity error in a capacitive scale.

Conventionally, for example, in a donkey-pal type scale, the parallelism between the fixed side and the movable side is due to parts accuracy 2, stacking error 1 due to assembly, etc., so the receiver is The moving distance of the movable side is different, which causes eccentricity errors and makes it impossible to measure the weight accurately.For this reason, it is necessary to improve the dimensional accuracy of the parts or adjust the dimensions during assembly.
It was extremely troublesome.

Therefore, in order to eliminate the above-mentioned drawbacks, the present invention converts the weight into the amount of change in the coil spring or leaf spring, and this change is further applied to change the distance between two opposing parallel flat plates. The eccentricity error in a capacitive scale that displays the change in capacitance generated by weight can be minimized by making one of the two parallel plates tiltable in four directions (left and right of the front layer). The purpose of this is to enable easy adjustment and correction.

One embodiment will be described in detail below according to the drawings.FA)
, lB) is a U-shaped channel tA)(B).

At the upper and lower ends of the cono channels (A) and (B), plate springs (6) (6) are fixed parallel to each other and fixed plates (7) (7
) +7) +7), and one channel (
Attach the fixed sensor holder (2) to the side of A) with screws (3).
) (3) and attach this fixed sensor holder (2).
) is fixed to the tip of the fixed electrode plate (5) via an insulating material (4). There is.

In the channel (B), attach the plate holder rod (9) to the screw (10).
+101 and moveable electrode plate (11
) is fixed, and this plate holder is a so-called donkey pal type scale in which a plate spring (61 (6)) is deflected by applying a load onto a rod (9), and the amount of this deflection is detected.

(11) is a movable electrode plate. This movable electrode plate (11)
is opposite to the fixed electrode plate (5), usually in parallel with a gap (1), and connected to the movable sensor holder (2:'1) through the insulating plate (4'). Fix it with the screw f12) (tz) on the moon.The fixing hole (131+13) of the movable sesser halter (2') should be an elongated hole or a bent hole, and the sensor holder can be moved slightly with respect to the center (Pi). (2') is rotatable.

Also, symmetrically to this, the fixing hole (13'l) of the fixed sensor holder (2) that fixes the fixed electrode plate (5)
) in the stop hole (13) of the movable sensor holder (2').
) (13), the fixed sensor holder (2) may be slightly rotatable with respect to the center (P').

With the above configuration, when the plate support is loaded on the rod (9), the plate spring (6) (6) is bent, and as the channel (Bl) descends, the movable electrode plate (11) is separated from the fixed electrode plate (5), and the gap is (α) is formed, and the capacitance change value (△1) generated in this gap (α) is displayed digitally or analogously as an oscillator parameter.At this time, regarding the adjustment of left and right eccentricity errors, for example, The plate support for the load is a rod (9
) When a load is applied to point a of the bar (9), if the load value (W) displayed is slightly higher than that of the value applied to the center (e) of rod (9), it is configured below point a. Two parallel plates fsNt
1) Screw +1 so that the gap (Oa) 9111 becomes narrower.
2) Correct by loosening +12) and tilting the movable sensor holder (2').

Conversely, the plate support is loaded at the 0 point of the rod (9), and the same four angles as above are applied.
When the door is eccentrically placed in the t (3 state), the gap (OC) side is corrected in the same way as above so that it becomes narrower, and the left and right eccentricity error is adjusted. may be fixed in a constant state, and the fixed sensor holder (2) fixed to the channel (A) may be tilted freely about 1 around the center CP') in the same manner as described above, and the correction may be made by adjusting the sensor holder (2).

・Next, the adjustment of the front shoulder eccentricity error was conventionally done using the channel (A
) The usual method was to correct by adjusting the dimension of the height (H') in (B), but in the present invention, the plate holder is
) between the channel (A) and the fixed sensor holder (2) so that the load narrows to the zero point in the center (1).
4) Insert a spacer (not shown) into the gap + (lb
) to make it narrower. Also, conversely, the plate holder is a rod (9)
If the same condition as described above occurs when a load is applied to point d of
15) with a spacer (not shown) inserted between the two parallel plates (5) and (11) located below point d ((]d
) is narrowed by adjusting the eccentric position error of the front shoulder.

With this very simple adjustment method, the eccentricity error can be adjusted and corrected, and the special U-shaped channel (
The dimensional accuracy of A) and (B), the length dimensions of the leaf springs (6) and (6) do not need to be made so precisely, and the eccentricity due to stacking errors due to assembly can be avoided. By adjusting the inclination of the load, it is possible to make corrections by adjusting the slope of the load, which not only improves accuracy against eccentric loads, but also has the effect of improving productivity.

[Brief explanation of drawings]

FIG. 1 is a plan view, FIG. 2 is a top view, FIG. 3 is a rear view, and FIG. 4 is a sectional view taken along line A-. 1... Base 5... Fixed electrode plate 6... Leaf spring 11... Movable electrode plate A, B... Channel △
9... Change patent applicant Tanita Manufacturing Co., Ltd.

Claims (1)

[Claims] A fixed electrode plate (5) is fixed to a channel (A) fixed to a base (1), while a channel (r3) is movable via a plate spring (6) or a coil spring by applying weight. A movable electrode plate (11) is fixed so as to face parallel to the fixed electrode plate (5), and the fixed electrode plate (5)
and the change in capacitance that occurs between the movable electrode plate (11) (
Δ9. ) and displays the weight, the two parallel plates (movable electrode plate (11), fixed electrode plate (5)) are tilted with respect to the left and right front electrode sheet metal layers. A method for adjusting the eccentricity error in a capacitive scale that allows the adjustment of the eccentricity error.