JPS59125071A - Zero point adjusting mechanism in movable coil type measuring instrument - Google Patents

Abstract

PURPOSE:To reduce man-hour for assembly and a cost by providing a notched part at a position outside of an adjusting range on a zero point adjusting fixer in order to install it to a projecting part provided on a supporting part of the zero point adjusting fixer, and constituting so as to give friction to the projecting part when the fixer is turned for adjustment. CONSTITUTION:A housing 6 consisting of resin, etc. has a supporting part 15 and also two projecting parts 13 provided symmetrically as one body, so that a zero point adjusting fixer 2 is supported by the housing 6. On the other hand, as for the zero point adjusting fixer 2, a notch 2' which is a little larger than the projecting part 13 is provided on a rotating position outside of the zero point adjusting range of a helical spring 1 in an inserting hole 2' of the projecting part 13. When installing the zero point adjusting fixer 2, the fixer 2 can be attached to the housing by aligning and fitting in the notch 2' of the fixer 2 and the projecting part 13 of the housing 6, and only rotating it in the direction of the zero point adjusting range of a spiral spring 2. Thereafter, the other end of the spiral spring 2 and a fixing terminal 9 are connected by means of soldering or caulking, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a zero point adjustment mechanism in a moving coil type instrument.

Conventionally, a zero point adjustment mechanism for a hairspring, which is a helical spring in a moving coil type instrument, has been provided to set the position where no force is applied to the hairspring, but its structure is shown in Figure 1. A movable shaft 8 rotated by a movable coil 7 etc. is supported by the housing 6, and the other end of the helical spring 1, one end of which is fixed to the movable shaft 8, has a zero point of the helical spring 1. The fixing terminal 9 of the point adjustment fixer 2 is fixed, and the zero point adjustment fixer 2 is attached to the housing 6 via an upper bearing 5 with a wave washer 3 and a nut 4. There is. Then, zero point adjustment is performed by rotating the fixer 2 (a wave washer 3 or the like is used to apply an appropriate frictional force when the fixer 2 is rotated).

However, in the above structure, the wave washer 3 and nut 4 are used to attach the zero point adjustment fixer 2 to the housing 6, which is expensive in terms of cost and assembly man-hours.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a zero point adjustment mechanism for a moving coil type instrument that can reduce assembly man-hours and keep costs low. .

In accordance with the above object, the present invention provides a moving coil type instrument in which a zero point adjustment fixer of a thinly coiled spring is attached to a housing, and a protrusion is provided on the shaft support of the zero point adjustment fixer in the housing, and the protrusion The zero point adjustment fixer is provided with a notch at a position outside the adjustment range so that the zero point adjustment fixer can be attached to the adjustment range, and is configured to apply friction to the protrusion when the fixer is rotated for adjustment. It is found in the zero point adjustment mechanism of moving coil type instruments.

In the following, the invention will be explained on the basis of a illustrative embodiment.

As shown in FIGS. 2 to 4, the moving coil type instrument includes a magnet 11 and an annular iron core 1 mounted on a circular yoke 10 that is integrated with the housing 6 inside the housing 6.
2 is attached to the housing 6 and the circular yoke 1.
A movable shaft 8 is supported between the magnet 11 and the annular iron core 12 and is supported by an upper bearing 5 etc. . Further, a thin coil spring 1, which is a hair spring, is fixed at one end to the movable shaft 8 and at the other end to the conductive fixing terminal 9 of the opening point adjustment fixer 2 by soldering or tightening. sandwich the insulator 14 and move it up and down 2
are arranged.

The zero point adjustment fixer 2 is rotatably supported on the nozzle 6, and the conductive fixing terminal 9 is fixed by tightening, gluing, or the like. The drive torque acting on the movable coil 7 is balanced by the current flowing through the movable coil 7 with respect to the thinly wound spring.

In the moving coil type instrument having the above configuration, the zero point adjustment mechanism of the present invention is made of resin or the like because the zero point adjustment fixer 2 is pivotally supported by the housing 7 and the housing 6 as shown in FIGS. 2 and 4. The I housing 6 has a shaft support 15 and two integrally symmetrically provided protrusions 13.

The protrusion 13 is larger than the inner diameter hole in which the fixer 2 is rotatably supported, has a shorter length than the outer diameter of the fixer 2, and has a lower end located at a slightly lower height than the thickness of the fixer 2. The fixer 2 has an appropriate width and thickness such that the fixer 2 can be rotated and fixed by friction.

On the other hand, the zero point adjustment fixer 2 has a rotational position that is outside the zero point adjustment range of the helical spring 1 in the insertion hole 2' of the shaft support 15 of the projection 13. A notch 2' that can be fitted into the thick projection 13 is provided.

In the zero point adjustment mechanism with the above configuration, the zero point adjustment fixer 2 is first assembled by attaching the notch 2' of the fixer 2 and /
・Simply fit together the projection 13 of the housing 6 and rotate it in the direction of the zero point adjustment range of the thin coil spring 2.
The fixer 2 can be attached to the mounting 6. Thereafter, the other end of the thinly wound spring 2 and the fixing terminal 9, which is a terminal, are connected by soldering, tightening, or the like.

With only the above assembly, the appropriate friction of the fixer 2 when adjusting the zero point of the thin winding spring 2 can be provided by utilizing the elasticity of the screw 6, and the conventional wave washer 3 can be used. Can be abolished. moreover,
By also eliminating the fixing nuts 4 for the fixer 2 and the wave locker 3, the screw tightening process at that time becomes unnecessary.

In the above embodiment, the zero point adjustment fixer 2 was attached to the outside of the housing 6, but as shown in FIG. 2 may be provided inside the housing 6.

Further, in the above embodiment, the notch 2' of the zero point adjustment fixer 2 was provided in the insertion hole 2' of the shaft support 15 of the protrusion 13, but as shown in FIG. 2''/, and two fixers 2 are provided at symmetrical positions with respect to the rotating shaft 8 in the vicinity of the shaft support 15' so that the protrusion 13'' of the housing 6 can also be fitted into the notch 2''.
It may be configured so that it can rotate.

As described above, according to the present invention, a protrusion is provided on the shaft support of the zero point adjustment fixer in the housing of a moving coil type instrument, and in order to be attached to the protrusion, the zero point adjustment fixer is placed at a position outside the adjustment range. In addition to providing a notch, the structure is configured to apply friction to the protrusion when the fixer is rotated for adjustment, so the conventional wafer washers, etc. that provide friction are unnecessary together with the fixing nuts, etc. of this stopper. This has the excellent effect of reducing costs, eliminating the need for a screw tightening process, and allowing one-touch assembly, reducing the number of man-hours required for assembly.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the zero point adjustment mechanism of a conventional moving coil type meter, FIG. 2 is a partially exploded perspective view of a moving coil type meter according to an embodiment of the present invention, and FIG. The figure is an explanatory diagram of the moving coil type instrument shown in Fig. 2, where (a) is a front view, the (1) l is a cross-sectional view, and Fig. 4 is the assembly of the zero point adjustment mechanism shown in Fig. 2. 5 is a sectional view corresponding to FIG. 4 showing another embodiment of the present invention, and FIG. 6 is a partially exploded enlarged perspective view showing still another embodiment of the present invention. It is a diagram. 1... Helical spring, 2... Zero point adjustment fixer,
2", 2"...notch, 6...no-using, 13
... Protrusion, 15... Pivotal support. Representatives Asamura and Akira 4 people Figure 1 t3 button (0) (b)

Claims (1)

[Claims] In a moving coil type instrument in which a zero point adjustment fixer of a thinly wound spring is attached to a housing, a protrusion is provided on the shaft support of the zero point adjustment fixer in the housing, and the zero point adjustment fixer is attached to the protrusion. A zero point in a moving coil type instrument, characterized in that the zero point adjustment fixer is provided with a notch at a position outside the adjustment range, and is configured to apply friction to the projection when the fixer is rotated for adjustment. Adjustment mechanism.