JPH0758215B2 - Weight sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention can be used as a general weight sensor, but particularly, a weight sensor suitable as a weight sensor for animals in a cage, and a weight sensor using the weight sensor. The present invention relates to a measuring device.

[Conventional technology]

As is well known, the weight of an animal in a cage is usually measured by removing each animal from the cage and measuring the weight on a platform scale. However, not only is it time-consuming and time-consuming for the animals to be taken in and out, but also the animals often run into anxiety during weight measurement, which requires skill in handling, and therefore the advent of a simple measurement method and device has been desired.

In order to solve this problem, a method for measuring body weight without putting out an animal from a cage and a device therefor, as disclosed in Japanese Patent Laid-Open No. 1-229915, were proposed and put into practical use to study many experimental animals. It has been well received in places and hospitals.

[Problems to be Solved by the Invention]

Since the weight sensor currently used for measuring the weight of the animal in the cage is a plate-shaped weight sensor as an example of the implementation disclosed in JP-A-1-229915, a sludge is used on the floor. In the case of a cage, the upper surface of the weight sensor is often contaminated with animal excrement during the weight measurement, and the waste must be wiped off each time.

Therefore, it is an object of the present invention to provide a weight sensor which is not contaminated even if it is excreted by an animal during weight measurement.

[Means for Solving the Problems]

The present invention has been made in order to solve the above-mentioned problems, and the first invention is that the base has a shape with a transmission space inside or a □ shape, and a roberval is provided on one side of each of the opposite sides of the base. A load sensor having a mechanism is provided in a cantilever shape, and a weight detection bar is provided at each end of these two load cells.

In the second invention, the base is formed in a shape having a transmission space inside or in a square shape, and a load cell having a Roberval mechanism is attached to one side of the base in a cantilever shape, and a weight of a shape is formed at an end portion of the load cell. A weight sensor having a detection bar attached.

[Action]

In the present invention, since the shape of the weight sensor is shaped like a square, the excrement falls through the space without touching the weight sensor, and the weight sensor itself is not contaminated. Can be performed more efficiently than a linear weight sensor.

Further, in the present invention, a load cell having a known Roberval mechanism is used, one end of which is attached in a cantilever shape to the base, and one end of the weight detection bar is connected to the other end. In addition to being configured, the weight can be accurately measured regardless of the position of the object to be measured on the weight detection bar, and the weight sensor having a square or square shape can be easily realized.

Hereinafter, embodiments of the present invention and effects thereof will be described with reference to the drawings.

〔Example〕

1 to 4 show a first embodiment according to the present invention. FIG. 1 is a partially cutaway plan view, FIG. 2 is a side view of the same, and FIG. 3 is a rear view of the same. FIG. 4 and FIG. 4 are enlarged sectional views taken along line XX of FIG.

1 to 4, 1 is a front frame 1a and a guide groove 2
□ -shaped base consisting of left and right side frames 1b and 1c and a rear frame 1d, and 3,3 are load cells having a known Roberval mechanism whose one end is fixed to the front frame 1a of the base 1, and each load cell 3, 3
At both outer ends of the base 1 through the intermediate piece 4, both side frames of the base 1
Weight detection bars 5, 5 located above 1b, 1c are connected.

Animal excrement is connected to the inside of these weight detection bars 5 and 5 by a connecting frame 7 at the rear of both side frames 16 of the base 1.

Reference numeral 8 denotes a handle attached to the front frame 1a of the base 1, which is provided with a recording switch 9.

The weight sensor A shown in FIGS. 1 to 4 is connected to a display device B, which will be described later, via a 6-core cable 10 which sends electric power and a detection signal, and is received on the weight detection bars 5, 5. When the object to be measured is placed via a plate, floor board or sludge, the weight of the load cell 3, 3 has a Roberval mechanism. Is detected.

FIG. 5 is an explanatory view when the weight of the animal in the cage is measured using the weight sensor A and the digital display device B described above.
Is a cage for three animals which is the same as that disclosed in Japanese Patent Application Laid-Open No. 1-229915.

Unlike conventional cages, this cage 11 does not have a bottom, and the weight sensor receivers 12 and 12 tilted inward are provided on both sides of the lower part of each room, and the sludge 13 is placed on the upper part thereof. It is a thing.

Then, the weight sensor A is inserted between the weight sensor receiving portions 12, 12 and the sludge saw blade 13.

The weight sensor A is provided with weight sensor receivers 12, 12
Insert in time.

Then, the weight of the animal in the cage is digitally displayed on the display window 14 of the display device B.

FIG. 6 is a block diagram of the electric circuit of the display device B. When the load of the animal in the cage is applied to the load cells 3,3 via the tread plate 13, the weight detection bars 5,5 and the intermediate pieces 4,4, The load cells 3, 3 send an analog detection output proportional to the shared load.

This detection output is given to the common terminal 15 of the weight sensor A, added, and then input to the terminal of the display device B, then amplified by the amplifier 16 for level adjustment, and then A /
After being converted into a digital signal by the D converter 17, the digital signal is given to the display unit 18, and the weight is digitally displayed on the display window 14.

The display device B is provided with a program key 19 for setting one scale.
The maximum weight value can be set, and by pressing the switch 9, the measurement information can be transmitted to the printer, the CPU or the like via the cable 20. Reference numeral 21 is a power cord.

[Different Examples]

Although the first embodiment described above uses two load cells, the number of load cells may be one. FIG. 6 shows a main part configuration of the embodiment (second embodiment). One end of a load cell 3 having a known Roberval mechanism is fixed to a front frame 1a of a □ -shaped base 1, and the other is fixed. A weight detection frame 51 having a shape is attached to the end.

However, this structure is inferior in strength to the above-described embodiment using two load cells, and the practical weight detection sensor shown in the above-mentioned embodiment using two load cells is preferable.

Although the weight sensors shown in FIGS. 1 and 6 are all square-shaped, the rear frame 1d of the base 1 and the connecting frame 7 directly connecting the rear portion of the weight detection bar can be omitted.

That is, it is possible to obtain a weight sensor that does not hinder measurement.

〔The invention's effect〕

Since the weight sensor according to the present invention is formed in a shape having a permeation space inside or a square shape, even if the animal excretes during the measurement of the animal in the cage, the excrement falls in the middle and the weight sensor The animal in the cage can be efficiently weighed without being polluted by excrement.

Further, according to the present invention, one or two load cells having a known Roberval mechanism are attached to one end in a cantilever shape on a base having a transmission space inside or a square shape, and one end of a weight detection bar is attached to the other end. With the structure in which is connected, it is possible to form a thin or square shaped weight sensor.

[Brief description of drawings]

1 to 4 show a first embodiment according to the present invention. FIG. 1 is a partially cutaway plan view, FIG. 2 is a side view of the same, and FIG. 3 is a rear view of the same. 4 and 5 are enlarged sectional views taken along line XX, FIG. 5 is an explanatory view of a method for measuring the weight of an animal in a cage using the weight sensor shown in FIG. 1, and FIG. 6 is a main view of a display device. FIG. 7 is a block diagram of an electric circuit, and FIG.
3 is a perspective view of the embodiment of FIG. 1 …… Base 1a …… Front frame 1b, 1c …… Side frame 1d …… Rear frame 2 …… Guide groove 3 …… Load cell 4 …… Middle piece 5 …… Weight detection bar 6 …… Skirt 7 …… Connecting frame 8 …… Handle 9 …… Switch 10 …… Cable 11 …… Cage 12 …… Weight sensor receiver 13 …… Tread 14 …… Display window 15 …… Common terminal 16 …… Amplifier 17 …… A / D conversion Device 18 …… Display device 19 …… Program key 20 …… Cable 21 …… Power cord 51 …… Weight detection frame A …… Weight sensor B …… Display device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuniji Ito 28, Nishikyogoku Katsurano-cho, Ukyo-ku, Kyoto Prefecture Kitayama Labes Co., Ltd. (72) Inventor Teruyuki Yoshikawa 8-4-19 Tajima, Urawa-shi, Saitama Prefecture Within System Integrated Development Co., Ltd. (56) References: Actual development Sho 50-118970 (JP, U)

Claims (2)

[Claims] 1. A shape having a transparent space inside the base or □
The load cell having a Roberval mechanism is provided in a cantilever shape on one side of each of the opposite sides of the base, and a weight detection bar is provided at each end of these two load cells. Weight sensor. 2. A base having a transmission space inside or a square
The load sensor having a Roberval mechanism is attached to one side of the base in a cantilever shape, and a weight detection bar is attached to the end of the load cell.