JPH1019650A - Scale fitted with windshield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air flow generation in a weighing chamber at the time of opening/closing of a windshield and to prevent space from being taken at the time of full opening. SOLUTION: A windshield is composed of a front panel 5, a side panel 6, and an upper panel 7. When the upper panel is opened for putting-in/taking-out of a test piece, the upper panel 7 is slid along slide rails 10 in the arrow A direction and, when a rotation shaft 8 fixed to a side surface of the upper panel 7 engages with a bearing plate 10, the upper panel 7 is rotated centering around the rotation shaft 8 in such a manner as to lift its khob 9, and the upper part of the windshield is thereby fully opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scale with a windshield, such as a precision electronic balance having a windshield.

[0002]

2. Description of the Related Art Precision balances, such as electronic balances, have been designed so that a small amount of air in the room in which they are installed affects the weighing accuracy. Is installed to provide a windshield for preventing the flow of air, that is, the wind. As a draft shield, a weighing chamber integrated with the weighing case is provided, and an electric door is attached for loading and unloading the sample into and out of the weighing chamber. A variety of shapes have been used, such as a simple one that is installed so as to surround it and has an upper lid on it.

As a mechanism for opening and closing the windshield for taking in and out the sample, the windshield is slid like a sliding door, or one end of the windshield is fixed with a hinge and rotated like a door. A mechanism that opens and closes has been used.

[0004]

In the conventional windshield opening / closing mechanism, when the windshield is slid, a space equivalent to the size of the opening is required in the sliding direction to fully open the opening. Therefore, if an attempt is made to widen the opening, the installation area becomes large. If the windshield is a door that rotates around one end,
When the shutter is closed, pressure fluctuations and air currents are generated in a weighing chamber surrounded by a windshield, and wind pressure and buoyancy act to cause a weighing error.

The present invention has been made in view of such circumstances, and provides a balance with a windshield, which does not generate pressure fluctuation or airflow in a weighing chamber when the windshield is opened and closed, and has a small installation area. It is intended to be.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a balance having a draft shield in which a weighing dish is surrounded by a plurality of draft shields, wherein at least one of the draft shields is provided on the plate. After sliding in a plane direction, an opening / closing mechanism for opening a windshield by rotating an axis included in the plane as a rotation axis is provided.

In the above scale with a windshield, the opening / closing mechanism includes a guide rail for guiding the windshield in the sliding direction, a rotation shaft provided on a side surface of the windshield in the sliding direction, and a predetermined position of the windshield. And a bearing that engages with the rotary shaft when slid to a position.

In the scale with the windshield of the present invention, when the windshield is opened, the windshield is slid in the plane direction of the plate, so that pressure fluctuations and air currents are generated in the weighing chamber surrounded by the windshield. There is no. After that, when the windshield is opened halfway, the windshield is rotated and opened like a door, so at that time there is little pressure fluctuation in the weighing chamber, and the windshield is not protruded greatly backward. There is no need to increase the installation area. Further, when closing the windshield, since the windshield is slid last in the reverse order to the above, the pressure fluctuation does not occur in the weighing chamber.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a weighing main body 1 has a built-in weight detecting section including a balance mechanism and the like, and has on its surface a display section 2 for displaying weighed values and the like and an operation section 3 including various switches and the like. A weighing dish 4 for placing a sample to be measured is installed on the upper portion of the weighing body 1, and the weighing dish 4 is connected to a weight detecting unit provided inside the weighing body. A windshield is formed around the weighing dish 4 on the upper surface of the weighing main body 1 by a side wall composed of four plates such as a front panel 5 and a horizontal panel 6 and an upper panel 7 closing an opening at an upper portion of the side wall. Variations in the measured weight value due to the flow of air are prevented.

A slide rail 11 is mounted in front of the left and right horizontal panels 6, and a pair of bearing plates 10 are also mounted on a rear end of the upper part of the horizontal panels 6. The upper panel 7 is mounted on the upper part of the side wall composed of the front panel 5 and the horizontal panel 6, and is guided by the slide rail 11 so as to be slidable in the front-rear direction indicated by the arrow A. At this time, the bearing plate 10 also functions as a guide to prevent the upper panel from shifting left and right. In front of the upper surface of the upper panel 7, a knob 9 is attached,
The operator grasps this knob 9 and slides it back and forth,
Alternatively, the upper panel 7 can be lifted.

A pair of rotating shafts 8 as cylindrical projections are provided on the left and right side surfaces of the upper panel 7 in the sliding direction. When the upper panel 7 is slid to a predetermined position, the rotating shaft 8 is mounted on the left and right horizontal panels.
The rearward sliding is limited at this position. The U-shaped portion of the slide rail 11 is relatively short, and when the upper panel 7 is slid to the position where the rotating shaft 8 contacts the bearing plate 10 (the state shown in FIG. 1), the upper panel The front end portion of the slide rail 7 is off the U-shaped portion of the slide rail 11, and the upper panel 7 can be lifted upward by grasping the knob 9. Then, the upper panel 7 rotates around the rotation shaft 8 and is opened upward like a door.

The manner in which the windshield is opened will be further described below with reference to FIG. 2 (a) to 2 (c) are plan views of the windshield, and FIGS. 2 (d) to 2 (f) are corresponding side views. 2A and 2D show a state in which the upper panel 7 is closed. At this time, the weighing chamber (the space surrounded by the windshield) is completely surrounded by the windshield. FIG. 2 (b)
5E and 5E show a state in which the upper panel 7 is slid backward while being guided by the slide rail 11 (to the right in FIG. 2), which is the direction indicated by the arrow B. At this time, the rotating shaft 8 is in contact with the bearing plate 10, and the upper half of the weighing chamber is open. Next, when the upper panel 9 is lifted in the direction indicated by the arrow C by grasping the knob 9, the state shown in FIGS. 2C and 2F is obtained. At this time, the upper panel 7 rotates about the rotation shaft 8 and opens like a door. When the upper panel 7 is opened vertically, the upper part of the weighing chamber is completely opened. In addition, when closing the upper panel 7, contrary to the above, from FIG.
It will be closed in the order of (a).

Since the upper panel 7 is opened as described above,
At the beginning of opening, only the upper panel 7 is slid, so that the pressure in the weighing chamber does not fluctuate. In the next stage, the upper panel 7 is lifted up, so that the upper panel 7 does not protrude greatly backward. At this time, since about half of the upper part of the weighing chamber is already open, there is no pressure fluctuation or large air blow into the weighing chamber.

In the above-described embodiment, the case where the upper panel of the windshield is opened and closed has been described. However, the present invention includes the case where the horizontal panel and the front panel are opened and closed. The number of panels that open and close is not limited to one, and two or more panels may be configured to open and close.

[0015]

The windshield used in the scale with the windshield of the present invention simply slides the windshield at the beginning of opening the windshield, so that pressure does not fluctuate in the weighing chamber, and the windshield is rotated in the next stage. It opens like a door, so the breeze shield does not protrude backwards. When the windshield is opened by rotation, about half of the opening of the weighing chamber is already open, so that there is no pressure fluctuation or large air blow into the weighing chamber. When closing the draft shield, first rotate the draft shield and close it like a door, but at this time it does not block all the openings of the weighing chamber, so pressure fluctuations in the weighing chamber and blowing wind are minimized. . Next, when the windshield is closed, the windshield is slid and closed, so that pressure fluctuation does not occur in the weighing chamber. Therefore, the scale with the windshield of the present invention does not generate pressure fluctuation or airflow in the weighing chamber at the time of opening and closing the windshield, so that accurate weighing can be quickly performed, and an excellent effect that the installation area is small is exhibited. .

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a state when a windshield is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Scale main body 2 ... Weighing pan 3 ... Display part 4 ... Operation part 5 ... Front panel 6 ... Horizontal panel 7 ... Upper panel 8 ... Rotating shaft 9 ... Knob 10 ... Bearing plate 11 ... Slide rail

Claims (2)

[Claims] 1. A scale having a windshield in which a weighing dish is surrounded by a plurality of windshields, wherein at least one of the windshields is slid in a plane direction of the plate, and an axis included in this plane is moved. A scale equipped with a windshield, comprising: an opening / closing mechanism that opens the windshield by rotating as a rotation axis. 2. The device according to claim 1, wherein the opening / closing mechanism includes a guide rail for guiding the windshield in a sliding direction, a rotation shaft provided on a side surface of the windshield in the sliding direction, and when the windshield is slid to a predetermined position. The scale with a windshield according to claim 1, comprising a bearing engaged with the rotating shaft.