JPH0441289Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a vertical rotation indicator used in material testing machines, analytical instruments, etc.

B. Prior art As a conventional rotation indicator of this type, Fig. 5 a and b
The load indicator for the universal testing machine shown in Figure 1 is known.
Balance beam 1 depending on the pressure of the ram cylinder, for example
The balance section 1b is driven by the servo motor 2 so that the beam 1a is tilted and the balance beam 1a becomes horizontal. This movement of the balance portion 1b causes the rotating shaft 4a of the pointer 4 to rotate via the wire 3. The pointer 4 is supported via a bearing 6 on a chassis 5 to which a scale plate 9 is attached, and the balance mechanism 1 including the balance beam 1a and the servo motor 2 are fixed to a frame 8 separate from the chassis 5. and the pointer 4 are connected to the wire 3. 9a indicates a scale.

C. Problems to be solved by the invention However, the connection between the pointer rotating shaft 4a, which is pivotally supported by the chassis 5, and the balance mechanism 1, which is installed in a frame 8 separate from the chassis 5, becomes complicated, and A frame 8 separate from 5 is essential. Furthermore,
Since the pointer 4, the pointer rotating shaft 4a, the balance mechanism 1, and the servo motor 2 are fixed to separate members, there is a problem in ease of assembly and disassembly. Therefore, when the balance mechanism 1 and the motor 2 are attached to the chassis 5 in order to improve the ease of assembly and disassembly, there is a problem that the chassis 5 vibrates when the motor 2 rotates, making it difficult to give accurate instructions.

The purpose of this invention is to provide a vertical rotation indicator that simplifies the connection system between the pointer rotating shaft and its drive system, improves assembly and disassembly performance, and also solves the problem of vibration caused by motor drive. .

D. Means for Solving the Problems The vertical rotation indicator according to the present invention has a pointer rotatably provided on the front side of a chassis arranged vertically, and a rotation axis of the pointer that is rotatable. A bearing mounted on the back surface of the supporting chassis, a holding member suspended from the bearing, a pointer drive motor installed on the holding member, and a power transmission system for transmitting the output of this motor to the rotating shaft. The above-mentioned problems are solved by providing the following.

E Effect Since the pointer drive motor is suspended from the bearing installed on the back of the chassis, the connection system between the pointer rotation shaft and the pointer drive system is simplified. Furthermore, since the pointer rotating shaft and the pointer drive motor are installed on the same chassis, assembly and disassembly are easy. Furthermore, chassis vibrations when the pointer drive motor rotates are suppressed, and instructions by the pointer become more accurate.

F. Embodiment FIGS. 1 to 3 show an embodiment in which the rotation indicator according to the present invention is implemented as a load indicator of a material testing machine.

In FIGS. 1 and 2, the chassis 11 is
A bolt 6 is attached to the case 12 that supports the rotation indicator 10.
1 (Fig. 2) is screwed vertically, and the chassis 11
A glass plate 13 is attached in front of the. A pointer 14 is rotatably supported on the chassis 11, and a scale 62 is printed on the surface of the chassis along a circumference with a predetermined radius around the rotation axis X. For example, the scale 62 has a diameter of 450 mm and is divided into 1000 equal parts. The pointer 14 is rotated, for example, at 1/5000 pitch by a drive mechanism attached to the chassis 11.

Figure 2 shows the details of the pointer attachment part and the drive mechanism.
are screwed in with bolts 22. For this installation, the through hole 11 made in the chassis 11
Bearing holder 21 is placed in centering groove 11b on the back side of a.
The centering protrusion 21a of the through hole 11a is fitted, thereby centering the center of the through hole 11a and the bearing holder 21. A pair of bearings 23 are installed inside the bearing holder 21 and rotatably hold the rotating shaft 24 of the pointer 14. Note that the bearing that is a component of the present invention refers to one in which the bearing 23 is assembled into the bearing holder 21. The pointer 14 is clamped and fixed between the head flange 24a of the rotating shaft 24 and the nut 25,
Further, rotation is prevented by a nut 25 by a screw 26. The rotating shaft 24 protrudes from the bearing holder 21,
There, a large gear (for example, 120 teeth) 27 is attached to the bolt 2.
It is fixed at 8. On the other hand, the bearing holder 21 is connected to a needle drive stepping motor (for example, one rotation at 1000 pulses) 3 via a holder (holding member) 29.
0 is suspended, and a small gear 31 (eg, having 24 teeth) is fixed to its output shaft 30a. This small gear 3
A precision timing belt 32 made of rubber is stretched between the gear 1 and the large gear 27. Here, the small gear 31, the large gear 27, and the timing belt 32 constitute a power transmission system.

Here, the holder 29 has a through hole 29a and a slot 29b shown in FIG. 3, and the bearing holder 21 is inserted into the through hole 29a, and the slot 29b is tightened with bolts and nuts 33A and 33B. The bearing holder 21 is frictionally clamped by the bearing holder 21. Further, a motor mounting plate 34 is attached to the holder 29, and the motor 30 is screwed onto this motor mounting body 34. The tension of the timing belt 32 is adjusted by moving the motor mounting plate 34 in the vertical direction in the figure to adjust the distance between the motor output shaft 30a and the pointer axis X.

When a drive signal is input to the motor 30 in accordance with the load detected by a load detector (not shown), the motor 30 rotates, and the small gear 31 and the timing belt 3
2. The speed is reduced to 1/5 via the large gear 27 to rotate the pointer rotating shaft 24, thereby rotating the pointer 14 to indicate a predetermined scale 9a. Now, when one pulse is applied to the stepping motor 30, the pointer 14 rotates by (360/5000) degrees.

Vibrations of the holder 29 due to motor drive are transmitted to the bearing holder 21, but since the bearing holder 21 is installed at the center of the chassis 11, the vibrations of the chassis 11 are suppressed. Further, vibrations generated when power is transmitted from the small gear 31 to the large gear 27 are absorbed by the rubber timing belt 32, and transmission to the chassis 11 is suppressed. Furthermore, since the bearing holder 21 and the pointer drive motor 30 are installed on the same chassis 11, assembly and disassembly are easy, and the mechanism for connecting the two is also simplified.

On the other hand, as described above, when installing the bearing holder 21, the annular centering projection 21a is fitted into the centering groove 11b of the chassis through hole 11a, and the bearing holder 21 is installed coaxially with the through hole 11. There is. Also, the scale 9a on the chassis 11 is set to the through hole 1.
It is provided on the circumference with a predetermined radius centered on the axis X of 1a. Therefore, the center of rotation of the pointer 14 and the center of the scale 9a are both the axis X, and the pointer 14 accurately indicates the predetermined position of the scale 9a at any rotational angular position. In addition, since the stepping motor 30 has good rotation control accuracy and large static torque,
Combined with the above configuration, it becomes possible to drive the pointer more accurately, allowing for even more accurate instructions.

In the above description, the holder 29 of the pointer drive motor 30 is
The holder 29 was hung from the bearing holder 21 by forming a slot 29b in the bearing holder 21, fitting the holder 29 into the bearing holder 21, and tightening the slot 29b with bolts. It may also be hung. That is, the flange 2 is attached to the bearing holder 21.
1b and fitted into the bearing holder 21
9 may be attached to the flange 21b with bolts 81. Further, any system may be used as long as the motor 30 is installed on a holding member attached to the bearing holder 21 of the pointer rotating shaft 24. Furthermore, the pointer drive motor is not limited to a stepping motor. Furthermore, instead of the timing belt method, a belt method using a V-belt or the like, a chain method, or a wire method may be used. In addition, it is not limited to the load indicator of the material testing machine.
The present invention can be applied to various indicators such as analytical instruments.

G. Effects of the invention According to the invention, the pointer drive motor is suspended from the bearing of the pointer rotation shaft attached to the chassis, which simplifies the connection mechanism between the pointer rotation shaft and the pointer drive motor. Degradability is also improved. Furthermore,
Chassis vibrations when the pointer drive motor rotates are suppressed, making instructions by the pointer more accurate. This motor suspension method is particularly effective when the chassis has low rigidity, such as when the chassis is made thinner and lighter.

[Brief explanation of the drawing]

Figures 1 to 3 show the case where the vertical rotation indicator according to the present invention is implemented as a load indicator of a material testing machine, and Figure 1 is a side sectional view showing the pointer attachment part in detail, 2 is a front view of the load indicator, and FIG. 3 is a view taken along the - line in FIG. 1. FIG. 4 is a diagram corresponding to FIG. 1 showing another suspension method, and FIG. 5 shows a conventional vertical rotation indicator, in which a is a front view and b is a side view. 10... Vertical rotation indicator, 11... Chassis,
11a...Through hole, 11b...Centering groove, 12
... Case, 14 ... Pointer, 21 ... Bearing holder, 24 ... Rotating shaft, 27 ... Large gear, 29 ...
Holder, 30... Motor, 31... Small gear, 32
……Timing belt.

Claims (1)

[Scope of utility model registration request] A pointer rotatably provided on the front side of a chassis arranged vertically, a bearing that rotatably supports the rotating shaft of this pointer and is attached to the back of the chassis, and a holder suspended from this bearing. A vertical rotation indicator comprising: a member; a pointer driving motor installed on the holding member; and a power transmission system that transmits the output of the motor to the rotating shaft.