JPS6135935Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to balances.

Generally, a balance uses a lever to magnify the displacement of the movable side due to the load applied to the Roberval mechanism.
This configuration uses an electromagnetic force generator or the like to generate a force that balances the load. In order to obtain a highly accurate balance, the load applied to the roberval mechanism must be accurately transmitted vertically to the lever force point. In conventional balances, the relative positional relationship between the movable side of the Roberval mechanism and the point of force of the "lever" is optimally set by adjusting each fulcrum of the Roberval mechanism. However, when this adjustment is made, distortion occurs in the member that connects the roberval mechanism and the "lever".
Furthermore, since the side length of the parallelogram of the Roberval mechanism changes, it is necessary to readjust the eccentricity error. In addition, in order to downsize the electromagnetic force generator,
There is a tendency for the length between the leverage point and the fulcrum of the lever to become shorter, and this shortening requires higher machining accuracy. In a balance weighing 1 to several kg, the length is several mm, and it is difficult to adjust the relative positional relationship with the Roberval mechanism fixed.

In view of the above points, the purpose of this invention is to easily adjust the load applied to the Roberval mechanism to be transmitted vertically and accurately to the force point of the "lever" while the Roberval mechanism is fixed. Our goal is to provide balances with excellent measurement accuracy.

The first feature of this invention is that the movable side of the Roberval mechanism and the point of force of the "lever" (the point where the load is transmitted) are connected by a vertical connecting member and a horizontal connecting member, and the actual length of the horizontal connecting member is adjusted. The structure is such that the vertical connecting member can be adjusted to a perfect vertical position.

The second feature of this invention is that the horizontal connecting member is auxiliary supported by an auxiliary support member having at least two bent portions between both ends, allowing movement only in the horizontal direction and preventing vertical and rotational movement. It was planned to be possible.

This invention will be explained below with reference to drawings of embodiments.

Fig. 1 is a cross-sectional view showing the configuration of this embodiment. Fig. 2 is an enlarged partial perspective view of the connection between the movable arm 1 and the "lever" 6. This embodiment shows an electromagnetic force balance that generates an electromagnetic force that balances a load. The movable arm 1 is a rigid body with a certain width, and its upper end is connected to a fixed arm 15 via members 2 and 3, and its lower end is connected to a fixed arm 15 via members 4 and 5.
The magnetic circuit components for generating electromagnetic force, which are the fixed arm 15 and the magnet 16, are supported by a lever fulcrum 1.
The lever 6 is supported by two fulcrums 19, 19. The distance between the fulcrum and the point of force is, for example, several mm.
A movable coil 17 for generating electromagnetic force is connected to the point of action 14, and the load displacement is enlarged. An adjustment guide 9 is provided at the center of the lower part of the movable side 1, perpendicular to the surface of the movable side 1. The adjustment guide 9 is a bolt having a hole drilled in the center through which the threaded part of the horizontal connecting member 10 passes, and is fitted into the female thread 13 provided on the movable side 1 and fixed by a nut 11. The horizontal connecting member 10 has male threads at both ends, and is brazed to the end 20 of the auxiliary support member 7 on the side connected to the lever 6. The auxiliary support member 7 is fixed to the movable side 1 at its upper end 22 by a screw 27, and is an elastic body having a hole 24 in the center to prevent contact with the screw of the connecting member 8, and holes 23 and 25 at symmetrical positions from the center, as shown in FIG. 3A. One end of the horizontal connecting member 10 and one end serving as the force point of the lever 6 are connected by a vertical connecting member 8. The horizontal connecting member 10 is fixed to the lower end of the vertical connecting member 8 by a nut 26. The length by which one end of the vertical connecting member 8 projects beyond the movable side 1 is adjusted by an adjustment guide 9.

In such a configuration, the parallelism of the fulcrums 19, 19 and the vertical connecting member 8 is matched so that the load is transmitted to the lever 6 in the vertical direction. First, Natsu 1
2, then loosen the nut 11, and change the screwing amount of the guide 9 to make adjustments. At that position, tighten the adjustment guide 9 to the nut 11.
Fix it by. Next, by rotating the nut 12, the vertical connecting member 8 is fixed to the movable side 1 via the adjustment guide 9. Since the horizontal connecting member 10 is fixed to the auxiliary support member 7, it does not rotate due to the rotation of the nut 12, but is fixed to the adjustment guide 9, and can only move in parallel along the axis together with the adjustment guide 9. be. Further, as shown in FIG. 3B, the auxiliary support member 7 is bent by the holes 23 and 25 to allow smooth translation. The bent portion provided on the auxiliary support member 7 can also be formed by a groove. Further, the number of bending points may be three or more.

As described above, according to this invention, the vertical connecting member between the movable side and the "lever" can be adjusted in the perfect vertical direction without bending, twisting, or other distortions to the connecting member, resulting in high precision. You can get a balance with Further, the adjustment can be made from the outside while the Roberval mechanism is fixed, making the adjustment work easy, and by simply providing a simple adjustment device, the adjustment can be made without affecting the eccentricity error.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is a partially exploded perspective view of FIG. 1, and FIG. 3 is an explanatory view of the operation of the auxiliary support member 7 of this embodiment. 1...Movable side, 2, 3, 4, 5...Member, 6...
... Lever, 7 ... Auxiliary support member, 8 ... Vertical connection member, 9 ... Adjustment guide, 10 ... Horizontal connection member,
11, 12...nut, 15...fixed side, 16...
... Magnet, 17... Moving coil, 18... Fixed member, 19... Lever fulcrum support member, 23, 25...
...hole.

Claims (1)

[Scope of utility model registration request] The whole is a parallelogram, one side is fixed, and the opposite side is a mechanism formed on a movable side that is vertically displaced by an applied load, and a lever that magnifies the displacement of this movable side. , a device comprising a means for applying a moment to the lever to balance the load, a vertical connecting member having an upper end fixed to the force point of the lever and hanging down, and a lower end of the vertical connecting member provided on the movable side. a horizontal connecting member that is adjustable and supported by an adjustment tool and can be displaced in a direction parallel to the fulcrum and force point of the lever and perpendicular to the displacement direction of the movable side; an auxiliary support member that hangs down and has a lower end fixed near one end of the horizontal connection member, and has at least two bent portions between both ends;
A balance configured such that the attitude of the vertical connection member can be adjusted by the adjustment tool.