JPS64575Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scale, and more particularly to a scale capable of alleviating an impact load acting on a receiving tray and transmitting it to a load detection sensor.

Generally, when an object to be measured is placed on a balance tray, some kind of impact load is applied, and this impact load can deteriorate the parts of the scale, especially the parts of the load detection sensor, or in severe cases lead to damage. There are times. Therefore, in conventional scales, rubber or coil springs are inserted between the tray and the tray holder below it to cushion the impact, or the tray 1 is supported as shown in the front view in Figure 1. The tray support 2 and a sensor section 3 for detecting the load on the tray 1 are connected by two mutually parallel leaf springs 4 and 5 to reduce the impact. However, the former type of conventional scale has the disadvantage that the tray tilts when an eccentric load is applied to the tray, while the latter type of conventional scale does not cause the tray to tilt due to the parallel spring mechanism. Although not shown in FIG. 1, it is necessary to incorporate a damper for damping the vibrations of the leaf springs 4 and 5, which has the drawback of increasing costs.
When a load W is placed at a position separated by a distance E from the center of Force P and tensile force T act respectively,
From the viewpoint of ease of use of the scale, it is desirable that the tray 1 has a large area and a low height, so the above-mentioned P and T are large values, and in order to withstand buckling etc., the plate springs 4 and 5 must be The thickness must be increased, and the spring constant therefore becomes large, resulting in a drawback that the shock-reducing effect cannot be sufficiently exerted.

The purpose of this invention is to provide a scale with a shock absorbing device that does not tilt even when subjected to eccentric loads, has a sufficient impact mitigation effect, does not damage parts, and has a simple structure with a small number of components. Our goal is to provide the following.

The feature of this invention is that two leaf springs each having a groove-shaped section perpendicular to the axis are stacked one above the other parallel to each other so that the side walls of the groove-shaped sections are in contact with each other. The present invention is characterized in that the receiving tray and the load detection sensor section are connected via the buffer body.

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a front view showing the main structure of the embodiment of the present invention.

A tray holder 12 that supports a tray 11 on which an object to be measured is placed and a sensor section 13 that detects the load on the tray 11 are connected by parallel leaf springs 14 and 15 as shown below. The leaf springs 14 and 15 each have a groove-shaped portion, as shown in FIG. The side wall portions 14a and 15a are vertically stacked facing each other so as to be in contact with each other.

If the plate support 12 and the sensor part 13 are connected by such plate springs 14 and 15, when an impact load is applied to the plate 11, the parallel spring mechanism of the plate springs 14 and 15 will elastically absorb the impact. At the same time, the vibration of the spring is transmitted to each side wall portion 14a.
It is attenuated by the frictional damping effect caused by the contact between 15a and 15a.

The groove-shaped portions of leaf springs 14 and 15 are connected to leaf spring 1.
4 and 15, the buckling strength can be increased without increasing the spring constant, allowing the use of a leaf spring with a small spring constant, and fully exhibiting the impact mitigation effect. be able to.

Note that the groove-shaped side wall portions 14a, which are in contact with each other,
15a, for example, on the side wall portion 14a of the upper leaf spring 14, a protrusion 14b is provided, as shown in FIG. If you configure it to
The friction damping effect can be further improved.

Furthermore, as shown in a similar cross-sectional view in FIG.
If configured to contact the other side wall portion, the upper and lower leaf springs can be made into a common component, and costs can be reduced.

As explained above, according to the present invention, the buckling strength of the leaf springs is improved by constructing a parallel spring mechanism with two leaf springs each having a groove-shaped cross section.
As a result of being able to use a leaf spring with a small spring constant, it is possible to obtain a scale that has a sufficient impact mitigation effect, and the receiving tray does not tilt even under eccentric loads, and also reduces friction due to mutual contact between parallel springs. Since vibrations can be attenuated by the damping effect, there is no need to separately incorporate a damper as in the past, which greatly contributes to cost reduction by reducing the number of parts and simplifying the structure. Additionally, as a result of experiments, it was found that the amount of friction damping changes depending on the size of the impact load, making it possible to always provide appropriate damping.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the main parts of a conventional scale, Fig. 2 is a front view showing the main parts of the embodiment of the present invention, Fig. 3 is a sectional view taken along line A-A, and Figs. 4 and 5 are FIG. 4 is a sectional view similar to FIG. 3 showing another embodiment of the present invention; 11... saucer, 12... saucer holder, 13... sensor section, 14, 15... plate spring, 14a, 15a
...Side wall portion, 14b, 15b...Protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) Two leaf springs each having a groove-shaped section perpendicular to the axis in at least a portion thereof in the axial direction, such that both side walls of the groove-shaped section are mutually connected to each other. a tray on which the object to be measured is placed, stacked vertically parallel to each other so as to face each other so as to be in contact with each other;
The scale is connected to a sensor section that detects the load on the receiving tray via the two leaf springs, and is configured to alleviate the impact load generated when the object to be measured is placed on the receiving tray. (2) A utility model registration request characterized in that a protrusion is formed on one of the mutually contacting portions of the two leaf springs and brought into contact with the other side wall portion to improve the friction damping effect due to the contact. Scales listed in Scope 1.