JP2005291764A - Electronic scale - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply a windbreak function to a multipurpose type electronic scale without adding special components. <P>SOLUTION: A recessed part 4 having the planar shape approximately same as that of a weighting dish 2 is formed on an upper part of an electronic scale 1. Almost the whole of weighting dish 2 is put in the recessed part 4 by being connected with a load transmitting part 3 formed on the recessed part 4, thus the lack of stability in measurement caused by air flow can be prevented. Further an opening part is formed on the recessed part by demounting a detachable side wall 5, so that the dust and moisture accumulated in the recessed part can be discharged to the external from the opening part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic balance configured to maintain high measurement accuracy regardless of the installation environment of the apparatus, and particularly to prevent measurement instability due to disturbance such as air flow.

  The use of electronic balances such as electromagnetic balance type or load cell type is widened by reducing the price and improving the performance of products, so that they can be used widely from high-precision analytical balances to general-purpose balances used for various applications. It has become to.

As the use of electronic balances expands, the usage environment of electronic balances also varies greatly. For example, the following patents are assumed assuming that the weight of an object including moisture is measured or used in a humid environment An electronic balance having a waterproof function has been proposed as in Document 1. In addition, there are not a few cases in which the device goes wrong or breaks down due to the intrusion of dust, and such dust countermeasures are also required. Also, in an installation environment where the flow of ambient air is large, for example, in an environment where the temperature is adjusted by an air conditioner, depending on the location, the flow of air such as wind blown from the air conditioner may be disturbed and the measurement value may be unstable. Become. As a configuration for coping with such a situation, a windshield provided (Patent Document 3) has been proposed.
JP-A-11-258032 JP-A 09-189597 JP-A-10-253435

  FIG. 4 shows a conventional general-purpose electronic balance. As shown in the figure, the general-purpose electronic scale has a configuration in which a weighing pan 51 is arranged on an upper surface 50a of a scale body 50 having a built-in weighing mechanism. Among the above-mentioned problems in general-purpose electronic balances having such a configuration, the influence of disturbances such as air flow and wind pressure fluctuations has become particularly serious in response to the higher accuracy of electronic balances. Is desired.

  For example, depending on the arrangement environment of the electronic balance, a part of the air fluidized by the air flow discharged from an air conditioner, an air purifier or the like or the wind pressure generated from various driving devices or the like may be There often arises a situation in which the space between the upper surface 50a wraps around and the weighing pan 51 is crushed by the air flow and becomes unstable, making accurate measurement difficult or impossible.

  In a high-precision electronic balance called an analytical balance, the weighing pan is placed in a closed space configured as a weighing chamber, and the placement environment of the analytical balance is also managed in a predetermined state in advance. Adequate measures are taken against airflow. On the other hand, general-purpose electronic balances do not take such windproof measures because it is necessary to ensure the workability in weighing work and to keep the price of electronic scales as general-purpose products within a certain level. .

  For this reason, in a general-purpose electronic balance, the electronic balance is placed in a place where there is relatively little disturbance, or the user independently surrounds the electronic balance using a cardboard material, etc. In some cases, measures are taken individually by the user. On the other hand, Patent Document 3 shows a configuration of a detachable windshield that covers a weighing pan of an electronic balance, and is proposed by the present inventors. If this windshield is used, even if it is a general-purpose electronic balance without a weighing chamber, it is possible to take almost perfect windproof measures. However, since this windshield is a component having a configuration different from that of the electronic scale, it cannot be denied that initial costs are generated.

The present invention is configured in view of the above-described problems, and is an electronic scale configured to exhibit stable performance against disturbances such as airflow without requiring special parts. And
That is, the present invention is an electronic scale configured such that a recess having a shape substantially equal to the planar shape of the weighing dish is formed on the weighing dish arrangement surface of the upper part of the electronic balance body, and the weighing dish is accommodated in the recess. It is an electronic balance characterized in that it is configured to be open and part of the peripheral wall portion forming the recess if necessary.

  By placing the weighing pan in the recess formed in the electronic scale body, it is possible to accurately measure the load even in an environment where the air flow is a disturbance of the load measurement in the conventional device without using special windshield equipment. It becomes possible.

  In addition, the formation of the recess does not complicate the structure of the electronic balance, so the manufacturing cost of the electronic balance due to the formation of the recess does not increase, and the windproof function is the same or lower than the conventional one. It is possible to provide an electronic balance having

  A recess is formed in the upper part of the electronic balance body, and the recess is formed in a plane shape substantially equal to the weighing pan, and the depth thereof is the side wall portion where the height of the upper surface of the weighing pan forms the recess. The height is almost equal to the upper end or slightly higher than the upper end. With this configuration, a weighing pan and a member (dish receiving member) that is connected to the weighing pan and transmits the load of the weighing object into the electronic balance main body are accommodated in the recess.

  By forming the recess, a wall portion is relatively formed around the recess, but a part of the wall portion can be opened. It cannot be denied to some extent that dust, a part of the weighed material, moisture or the like enters through a slight gap between the weighing pan and the wall around the weighing pan. In this case, if a part of the wall portion can be opened, dust or the like in the recess can be easily discharged from the opening portion.

  In addition, when the electronic balance body and the portion connecting the weighing pan and the load measuring mechanism in the electronic balance body have a waterproof (drip-proof) structure, the concave portion can be used in a configuration that can be used in an environment with a lot of moisture. A considerable amount of water may accumulate. In this case, if the bottom surface portion of the recess is formed so as to descend slightly toward the open portion, moisture can be easily removed, and the dirt in the recess portion can be washed with water.

First, an overall configuration of an electronic balance according to the present invention will be mainly described with reference to FIG.
In the figure, reference numeral 1 is an electronic scale body, 2 is a weighing pan, 3 is a load transmission portion formed on the electronic balance body 1 side, and the weighing pan 2 is connected to the load transmission portion 3 to connect the weighing pan 2 to the electronic balance body 1. The integrated electronic balance is configured so that the load of the weighing object placed on the weighing pan 2 is transmitted to the load measuring mechanism in the electronic balance main body 1 through the load transmitting portion 3. It is formed.

  Reference numeral 4 is a recess formed in the upper surface of the electronic balance body 1, and has a planar shape substantially equal to the planar shape of the weighing dish 2 accommodated in the recess 4. The recess 4 is formed so as to be as close as possible to the side edge of 2 and a side wall of a recess described later as long as the measurement does not adversely affect the measurement. In the case shown in the figure, the planar shape of the weighing pan 2 is substantially square, so that the shape of the recess is also substantially planar, and the side walls 4A, 4B, 4C and the detachable side wall 5 are formed.

  In the illustrated configuration, the upper edge of each of the side wall portions 4A, 4B, 4C, and 5 is formed in series at the same height as the uppermost end portion 12a of the display / operation unit 12 in the electronic balance main body 1, so Although the place 4 is configured to be depressed in the apparatus main body 1, the recess 4 is formed based on the relative relationship with the surrounding side wall part, so that, for example, the display / operation part 12 is provided. The recess 4 can also be formed by projecting and forming a side wall portion on the upper portion of the electronic balance body 1 with the position of the uppermost end portion 12a as a base portion.

  Further, the side wall indicated by reference numeral 5 is a detachable type that is completely separated from the electronic balance main body 1, but as shown by reference numeral 5a, it is hinged to the electronic balance main body 1, and is configured to open and close via this hinge. Is also possible. In short, the object can be achieved if the opening is formed in the recess 4 when the recess 4 is cleaned.

Next, the arrangement | positioning state of the weighing pan 2 with respect to the recess 4 is demonstrated using FIG.2 and FIG.3.
First, in FIG. 3, reference numeral 6 denotes a dish receiving member, and an engaging part 6 a is projected from the center of the dish receiving member 6, and one of the load transmitting parts 3 formed on the electronic scale body 1 side. The engaging portion 6 a on the side of the dish receiving member 6 is inserted into the recess of the engaging portion 7 a of the joint member 7 forming the portion, and both are connected by the screw 8. Since the joint member 7 is connected to a load measuring unit (not shown) such as an electromagnetic balance type weighing mechanism or a load cell type weighing mechanism housed in the electronic scale main body 1, the joint member 7 is loaded on the dish receiving member 6 side. The load is transmitted to the load measuring unit through the joint member 7.

  Here, the load transmission part 3 shown in FIG. 1 has a waterproof structure. That is, a diaphragm 9 is disposed as a member that allows waterproofing and displacement of the engaging portion 7a around the engaging portion 7a on the joint member 7 side that protrudes toward the recess 4 in the joint member 7 described above. Yes. Reference numeral 10 denotes a pressing ring for pressing the diaphragm 9, and 11 denotes a screw for fixing the pressing ring 10 to the case side constituting the electronic scale main body 1. With this configuration, a waterproof function is imparted to the load transmitting unit 3.

  Next, the overall structure of the electronic scale will be shown mainly with reference to FIG. In the configuration of FIG. 2, a recess is formed as an engaging portion 6a at the center of the plate receiving member 6, and the engaging portion 7a on the joint member 7 side formed as a protruding portion is engaged on the plate receiving member 6 side. Although it is configured to be inserted into the joint portion 6a, any configuration does not affect the contents of the present invention.

  Stoppers 13 are provided at the four corners of the recess 4 of the electronic balance body 1, and stopper receivers 6 b are provided on the back surface of the dish receiver member 6 corresponding to the positions where the stoppers 13 are formed. When a large load is instantaneously applied to the stopper, the stopper 13 and the stopper receiver 6b come into contact with each other, thereby preventing the large load from being transmitted to the weighing mechanism and protecting the weighing mechanism. Has been.

On the other hand, a support member 14 protrudes from the upper surface of the tray receiving member 6, and the weighing pan 2 is placed on the tray receiving member 6 so as to be supported by the support member 14.
Here, it is desirable to set the depth H of the recess 4 as follows. In other words, as shown in the drawing, the depth of the recess 4 is set so that the upper surface of the weighing pan 2 placed on the tray receiving member 6, that is, the position of the placement surface 2 a of the weighed item slightly protrudes from the recess 4. Is desirable.

  Although it is possible to make the arrangement height of the mounting surface 2a of the weighing pan 2 equal to or lower than the depth of the recess 4, when the load measurement object is a long object, etc. The object is caught on the side wall of the recess 4 and the load cannot be measured. For this reason, it is usually desirable to enhance versatility as an electronic balance by forming the mounting surface 2a of the weighing pan 2 so that it slightly protrudes from the recess. However, if the placement height of the mounting surface 2a is equal to or lower than the depth of the recess 4, it can be expected that the influence of the air flow on the weighing pan 2 will be reduced. An electronic balance that is not handled can be configured in this way.

  Next, it is possible to form the bottom surface of the recess 4 completely horizontally. However, the bottom surface of the recess 4 is directed toward the opening portion of the recess 4 formed in the arrangement portion of the detachable side wall 5 or the open / close type side wall 5a shown in FIG. If it is configured to descend slightly at an angle α, it is convenient to eliminate moisture accumulated in the recess 4 or to eliminate moisture when the recess 4 is washed with water.

  The electronic balance can be used without using special parts in an environment where there is a large amount of air flow and it is difficult or impossible to measure the load, and in a high humidity environment.

It is a perspective view of the electronic balance of the state which removed the weighing pan which shows the Example of this invention. It is sectional drawing by the AA line of FIG. 1 in the state which attached the weighing pan to the electronic balance main body. It is sectional drawing by the BB line of FIG. It is a side view of the conventional electronic balance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic scale main body 2 Weighing pan 3 Load transmission part 4 Recessed part 4A, 4b, 4C (Recessed) side wall part 5 Detachable side wall part 5a Hinge opening / closing type side wall part 6 Dish receiving member 7 Joint member

Claims (5)

In an electronic balance having a weighing pan positioned on the upper surface of the electronic balance body, the weighing pan arrangement portion on the upper surface of the electronic balance body is formed as a recess having a planar shape substantially equal to the planar shape of the weighing pan. An electronic balance characterized in that the electronic balance is located in the recess. 2. The electronic balance according to claim 1, wherein a part of the side wall of the recess forming the recess is configured to be movable so as to be an open portion that opens the recess. 3. The electronic balance according to claim 2, wherein the movable side wall portion is configured to be detachable from the electronic balance main body. 3. The electronic balance according to claim 2, wherein a part of the movable side wall portion is hinged to the electronic balance main body. 5. The electronic balance according to claim 2, wherein the bottom surface of the recess is formed slightly obliquely so as to descend toward the open part.

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