JPH031775Y2 - - Google Patents

Description

[Detailed description of the invention] (Purpose of the invention) The purpose of this invention is to provide a means for eliminating obstacles in the work of attaching a weighing pan in the production of a top-pan scale.

What is shown in FIG. 2 is an example of a conventional top-pan scale. That is, 1 is a load detection device that detects strain due to stress of a load and measures the load, and this load detection device 1 is housed and fixed in a housing 2. Since the illustrated load detection device 1 uses a load cell, it is attached so as to extend laterally from a vertical member 22 rising from the bottom wall 21 of the housing 2. 3 is a weighing plate, and a support shaft 4 passes through the top wall 23 of the housing 2 and transmits the stress described above to the load detection device.
As shown in the figure, it is screwed to a disk-shaped head body 41 formed at the top end of the head.

For conventional top scales like the one mentioned above,
When the weighing pan 3 is attached to the support shaft 4 in the production work, the gap d between the edge frame 34 of the weighing pan 3 and the top wall 23 of the casing is almost never equal around the entire circumference. This is because even if each part of a balance scale is manufactured to extremely accurate dimensions, installation errors are unavoidable when attaching parts using screws or other means. This is because it is almost impossible for the top wall 23 of the body to be completely parallel to the plane. In this way, even if the plane parallelism between the weighing plate 3 and the top wall 23 of the casing is incomplete, it does not affect the actual weighing at all.
It is true that this not only reduces the commercial value of the scale, but also impairs consumer confidence in the precision and accuracy of weighing. Therefore, as a countermeasure against such surface non-parallelism between the weighing pan and the top wall of the housing during production, it is necessary to not only strictly inspect the dimensional accuracy of each part, but also to check the adjustment pusher once assembled. The number of man-hours required for this is extremely large, as special tools such as screws are used to gradually adjust the mounting angle of the load detection device 1 in the left, right, front, and rear directions over time. This invention was made in order to deal with the above-mentioned obstacles in the production of top-pan scales.

(Structure of the device) This device will be explained below with reference to an embodiment shown in FIG. Apart from the difference in the configuration of the top surface of No. 4, the configuration is the same as that of the conventional example described above with reference to FIG. 2, so a description thereof will be omitted. According to this invention, the bottom surface of the mounting portion 31 of the weighing plate 3 and the top surface of the support shaft 4 are both formed into a broken spherical surface 5 having the same diameter.
On the other hand, a hole 32 is bored in the attachment part 31 of the weighing pan, and the weighing pan 3 is attached to the support shaft 4 through this hole 32.
is screwed to. In addition, according to the illustrated example, since the weighing plate 3 is manufactured from a single plate, it corresponds to the broken spherical surface 5 formed on the bottom surface of the mounting portion 31.
The wall of the mounting portion 31 itself is formed into a hollow shell shape, and the head of the mounting screw 6 is accommodated in the recess 33 created by this, and the bottom surface of the head of the screw 6 is also It is formed as part of a corresponding spherical surface.
However, the shape of the screw 7 shown in the drawings is not essential; it is sufficient that the screw 7 has the screw head of a commercially available normal screw, and that the bottom surface of the screw head engages the mounting portion 31 at its periphery. In addition, in the illustrated example, the reason why the collar 42 is formed at the top end of the support shaft 4 and the entire surface thereof is made into a spherical surface corresponding to the spherical surface 5 is to improve the stability of the weighing plate 3 with respect to the support shaft 4. be.

This device is constructed as described above, and the bottom surface of the mounting portion 31 of the weighing pan 3 and the top surface of the support shaft 4 are both formed into a broken spherical surface 5 having the same diameter.
Since a hole 32 is bored in the scale, the mounting part 31 of the weighing pan is attached to the support shaft 4 during production of the scale mentioned above.
Place it on the top surface of the board and screw it in through the hole 32. When tightening the screws, either visually check the gap d between the edge frame 34 of the weighing plate and the top wall 23 of the housing 2 around the entire circumference, or place appropriate gauges at several places around the edge frame 34 and tighten the screws. By doing so, the weighing pan 3 can be attached to the support shaft 4 so that the above-mentioned gap d is equalized over the entire circumference of the edge frame 34.

(Effects of the invention) Thus, according to this invention, in the production of top-pan scales, mounting the weighing pan is only a simple screw-fastening operation, and compensation for dimensional errors and installation errors of parts requires a large number of man-hours and requires skilled work. As a result, the work of correcting the weighing pan position is completely unnecessary, which greatly contributes to improving the productivity of the top weighing scale and reducing production costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an essential part of an example of an upper tray scale equipped with this invented device, and FIG. 2 is a longitudinal sectional side view of an essential part of an example of a conventional upper tray scale. 1 is a load detection device, 2 is a housing, 21 is a bottom wall, 2
2 is a vertical member, 23 is a top wall, 3 is a weighing plate, 31 is a mounting part, 32 is a hole, 33 is a recess, 34 is a frame, 4 is a spindle, 41 is a head body, 5 is a despherical surface, 6 is a screw.

Claims (1)

[Scope of utility model registration request] A casing 2 that accommodates and fixes a load detection device 1 that measures the load by detecting strain due to the stress of the load.
and the load detection device 1 passes through the top wall 23 of the housing 2.
In an upper pan scale having a weighing pan 3 attached to the top end of a support shaft 4 that transmits the stress, the bottom surface of the mounting portion 31 of the weighing pan 3 and the top surface of the support shaft 4 are both formed into a despherical surface 5 having the same diameter. While forming the mounting portion 31
A hole 32 is drilled in the hole 32, and the weighing plate 3 is inserted through the hole 32.
A weighing pan mounting device for an upper pan scale, which can be screwed onto a spindle 4.