JP2543766Y2 - Zero adjustment mechanism of movable iron-type instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zero-adjusting mechanism for a movable iron-type instrument, which is inexpensive and can be easily assembled due to a reduction in the number of parts and a reduction in the number of assembling steps.

[0002]

2. Description of the Related Art FIGS. 5 to 7 are explanatory views of a main part of a conventional example generally used conventionally.

In FIG. 1, reference numeral 11 denotes a supporting frame, and 12 denotes an upper arm provided in contact with the supporting frame 11 and having a locking claw 13. A spring arm 14 is provided in contact with the upper arm 12 and has a hair spring locking arm 15. 16 is provided in contact with the spring arm 14, one end of the locking claw 13 is locked, and the upper arm 12
This is a zero lever made of an elastic material and having a bent portion 17 for pressing the elastic member.

Reference numeral 18 denotes an upper arm 12, a spring arm 1
4. A nut for a stone screw inserted into a hole provided in the zero lever 16. Reference numeral 19 denotes a stone screw which is screwed to the stone screw nut 18 and screwed to the support frame 11 to be nationally set. 21 is a hair spring locking arm 1
5 is a hairspring whose one end is connected. Reference numeral 22 denotes a movable part connected to the other end of the hair spring 21.
Reference numeral 23 denotes a pointer connected to the movable unit 22.

In the above configuration, when the pointer 23 and the zero position of the scale are aligned, the zero lever 16 is rotated to move the movable part 2 through the spring arm 14.
2 is rotated to adjust the zero position of the pointer 23 . If the zero adjustment width of the pointer 23 is out of the range of the zero position of the scale or is out of alignment, the zero lever 16
Is fixed, and the zero adjustment width can be shifted to an arbitrary position by shifting the spring arm 14 with tweezers or the like.

[0006]

[Problems to be Solved by the Invention] However, in such an apparatus, the number of parts is increased and the upper arm 1 is required.
2. After the holes of the spring arm 14 and the zero lever 16 are aligned, the stone screw nut 18 must be inserted, and the spring pressure due to the bent portion 17 will inevitably vary. The present invention solves this problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a zero adjustment mechanism for a movable iron-type instrument that can be manufactured at low cost and with improved assemblability due to the reduction in the number of parts and the number of assembling steps.

[0008]

In order to achieve this object, the present invention provides a zero-adjusting mechanism for a movable iron-plate type instrument for aligning a pointer with a zero position of a scale scale. , A first and a second groove provided in a ring shape along the peripheral surface of the shaft, one end of the spring arm is provided orthogonal to one end, and the other end is a hair. A hairspring connection arm connected to one end of the spring, a claw having one end provided orthogonal to the other end of the spring arm, and a cross section C made of an elastic material inserted into the second groove. A zero lever having a shaped head, and the zero lever
And a comb tooth-shaped locking portion provided at a position facing the claw and the other end of the claw is locked. is there.

[0009]

[Function] In the above configuration, when the pointer is aligned with the zero position of the scale scale, the movable part is rotated via the spring arm by rotating the zero lever, thereby aligning the zero position of the pointer. . If the zero adjustment width of the pointer is out of the range of the zero position of the scale or is out of alignment, fix the zero lever, lift the spring arm claw with tweezers, etc. Shift to the position,
The zero adjustment width can be shifted to any position. Hereinafter, a detailed description will be given based on embodiments.

[0010]

FIG. 1 is an explanatory diagram of a main portion of an embodiment of the present invention.

In the drawing, the same reference numerals as those in FIG. 7 indicate the same functions. Hereinafter, only differences from FIG. 7 will be described. 3
Reference numeral 1 denotes an axis which forms a part of the support frame 11, as shown in FIG. 32 and 33 are first and second grooves provided in a ring shape along the peripheral surface of the shaft 31. 34 is inserted into the first groove 32 and is made of an elastic material as shown in FIG.
This is a spring arm having a C-shaped cross section.

Reference numeral 35 denotes a spring arm as shown in FIG.
One end of the arm 34 is orthogonal to one end, and the other end is a hair spring connection arm connected to one end of the hair spring 21. As shown in FIG. 3, reference numeral 36 denotes a claw provided with one end orthogonal to the other end of the spring arm 34. Numeral 37 denotes a zero lever which is inserted into the second groove 33 and is made of an elastic material and has a head portion 38 having a C-shaped cross section as shown in FIG. Reference numeral 39 denotes a comb-shaped engaging portion provided at a position facing the claw 36 of the zero lever 37 and the other end of the claw 36 is locked.

In the above configuration, when the pointer 23 is aligned with the zero position of the scale, by rotating the zero lever 37 , the movable part 2 is moved through the spring arm 34.
2 is rotated to adjust the zero position of the pointer 23 .

If the zero adjustment width of the pointer 23 is out of the range of the zero position of the scale or deviated,
By fixing the zero lever 37 and shifting the spring arm 34 with tweezers or the like, the zero adjustment width can be shifted to an arbitrary position.

As a result, (1) when the main part is a conventional example, the upper arm 1
Although the two parts are the spring arm 14 and the zero lever 16, the same function can be realized by the spring arm 34 and the zero lever 37 according to the present invention.

(2) Reduction of assembly man-hour In the case of the conventional example, after the three parts are aligned, the nut 18 for the stone screw is removed.
But the two parts 34 and 37 were
Since it suffices to insert them into 2, 33, the number of assembling steps is greatly improved. It is not necessary to make the pressing force of the bent portion 17 of the zero lever 16 constant, and the number of assembling and adjusting steps can be reduced.

[0017]

[Effect of the Invention] As described above, the present invention relates to a zero adjustment mechanism of a movable iron-type instrument for aligning a pointer and a zero position of a scale scale, with a shaft having one end fixed to a support frame. First and second grooves provided in a ring shape along the peripheral surface of the shaft; one end of the spring arm is provided orthogonal to one end and the other end is connected to one end of a hair spring; Hairspring connection arm and the spring arm
A claw whose one end is provided orthogonal to the other end of the system;
A zero lever having a head having a cross section C, which is made of an elastic material and is inserted into a groove of the comb, and a toothed shape of a comb provided at a position of the zero lever facing the claw and the other end of the claw is locked. A zero adjustment mechanism for a movable iron-type instrument, comprising a stop portion.

As a result, (1) In the case of the conventional example, the main parts are the three parts of the upper arm, the spring arm and the zero lever. With two parts of zero lever,
Similar functions can be realized.

(2) Reduction of assembling man-hour In the case of the conventional example, three parts were arranged and then mounted with a stone screw nut. However, since only two parts need to be inserted into the shaft groove, the assembling man-hour is large To be improved. It is not necessary to make the pressing force by the bent portion of the zero lever constant, and the man-hour for assembling and adjusting can be reduced.

Therefore, a zero adjustment mechanism for a movable iron-type instrument that can be manufactured at low cost and with improved assemblability can be realized by reducing the number of parts and the number of assembling steps.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a shaft 31;

FIG. 3 is an explanatory view of a spring arm 34;

FIG. 4 is an explanatory diagram of a zero lever 37.

FIG. 5 is an explanatory diagram of a configuration of a conventional example generally used in the related art.

FIG. 6 is an explanatory view of a partial assembly of FIG. 5;

FIG. 7 is an explanatory perspective view of a conventional example generally used in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Support frame 21 ... Hair spring 22 ... Movable part 23 ... Pointer 31 ... Shaft 32 ... First groove 33 ... Second groove 34 ... Spring arm 35 ... Hair spring connection arm 36 ... Claw 37 ... Zero lever 38 ... Head 39 ... Locking part

Claims (1)

(57) [Scope of request for utility model registration] 1. A zero-adjusting mechanism for a movable armature type instrument for aligning a pointer with a zero position of a scale scale, comprising: a shaft having one end fixed to a support frame; and a ring extending along a peripheral surface of the shaft. First and second grooves provided in a shape, and a spring arm having a C-shaped cross section which is inserted into the first groove and is made of an elastic material;
A hair spring connection arm having one end orthogonal to one end of the spring arm and the other end connected to one end of the hair spring; and one end orthogonal to the other end of the spring arm. A claw provided, a zero lever having a cross-section C-shaped head made of an elastic material and inserted into the second groove;
A comb-shaped engaging portion provided at a position of the zero lever facing the claw, the other end of the claw being engaged with the comb tooth.