JPH0110775Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a torque gauge used in a cassette-type torque meter.

A torque gauge used in a cassette-type torque meter has a structure in which the two wheels are connected by a spiral spring, and a scale is attached to one of the inner and outer rings, and a pointer is attached to the other.

This torque gauge is built into the cassette main body as at least one of a pair of reels on which tape is stretched, and this cassette main body is loaded into a cassette type tape recorder, and is used for winding or rewinding. This is used to measure the torque at the same time.

By the way, since the torque gauge is used for measurements while mounted on a cassette-type tape recorder, there is a risk that a large load beyond the allowable value will be applied to the spiral spring between the inner and outer rings when switching the operation button of the tape recorder or by operating it incorrectly. There is a problem in that this deteriorates, causing errors in measured values, or becoming unusable in a short period of time.

Therefore, in order to solve this problem, a low part is provided on the upper surface of the inner ring of the torque gauge within a range of about 180°, a stopper part consisting of a stepped part is formed at both ends of this low part, and a stopper part is formed on the inner edge of the scale plate of the outer ring. Protrude the board,
A structure has been devised that prevents rotation of the inner and outer rings of the torque gauge when the stopper plate and the stopper part are in contact with each other, thereby preventing excessive force from being applied to the spiral spring.

However, since the stopper plate uses a scale plate, it is flat and thin, so when it comes into contact with the stopper part, the contact area is small, and the stopper plate may run over the stopper part. There is a possibility that both parties will separate from each other.

The present invention solves the above problems by forming an arc-shaped notch in the scale plate of the torque gauge attached to one of the inner and outer rings, and providing a stopper plate to the other ring. In addition to protruding into the notch, both end edges of the notch and the side edges of the stopper plate, which serve as contact surfaces, are bent in the same direction, and the stopper plate is placed on the scale plate with both facing each other. This feature is characterized in that it prevents.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows a pair of torque gauges 1 according to the present invention.
2 shows the state in which the torque gauge 1 is assembled into a cassette main body C with a tape T stretched between the two. That is, torque gauge 1
is an inner ring 2 equipped with a shaft hole 2a into which a reel shaft is fitted;
and a bearing B which is arranged concentrically on the inner ring 2.
It consists of an outer ring 3 rotatably supported by an inner ring 1, and the terminals of a spiral spring 4 arranged between the inner and outer rings 2 and 3 are respectively fixed to the inner ring 2 and outer ring 1, and both rings 1 and 2 are spirally supported. They are connected by spring 4. A ring-shaped scale plate 5 with a scale 5a is attached to the outer ring 1, and a ring-shaped board 7 with a pointer 6 attached to the inner ring 2.

An arcuate notch 8 is formed in the inner peripheral edge of the scale plate 5 in a range of about 180° concentrically with the center of rotation, and a stopper plate is formed in the notch 8 from the outer edge of the disc body 7. 9 are provided protrudingly, and both end edges 8a, 8b of the notch 8 serving as contact surfaces and side edges 9a, 9 of the stopper plate 9,
9b is bent downward at a right angle, so that the side edge 9a of the stopper plate 9 faces the end edge 8a of the notch 8, and the side edge 9b of the stopper plate 9 faces the end edge 8b of the notch 8, respectively.

Next, the operation of the present invention will be explained.

Shaft holes 2a, 2a of inner rings 2, 2 of torque gauge 1
The supply reel shaft 10 and the take-up reel shaft 11 are respectively fitted, and the cassette body c is loaded into the cassette type tape recorder.

Next, when the tape recorder is placed in a recording or reproducing state, the tape T is run by the capstan 12 and the pinch roller 13. By the way, if, for example, the play button and the rewind button are pressed incorrectly, the torque may become abnormally large, and the relative displacement between the inner and outer rings 2 and 3 of the torque gauge 1 tends to become very large. However, in the present invention, when the relative displacement increases beyond a certain level, the side edges 9a, 9b of the stopper plate 9 come into contact with the terminal edges 8a, 8b of the notch 8, and the excessive relative displacement of the inner and outer rings 2, 3 is suppressed. Therefore, no excessive force is applied to the spiral spring 4. Moreover, the side edge 9a of the stopper plate 9,
9b and the end edges 8a, 8b of the notch 8 are bent downward at right angles and faced each other, so that they collide with each other on a wide surface, and the stopper plate 9 is reliably received by the end edge of the notch 8, making it possible to overcome this. Without,
The relative displacement between the inner and outer rings 2 and 3 of the torque gauge 1 can be reliably suppressed within a certain range.

As described above, in the present invention, the end edge of the notch formed in the scale plate and the side edge of the stopper plate of the ring-shaped disc protruding inside the notch are bent in the same direction and faced each other, so that The stopper mechanism can be constructed by using plate-shaped scale plates attached to the inner and outer rings and a part of the disk body, and the contact between the stopper and the notch is made on a wide vertical plane by bending the plate. , because the stopper plate is securely received at the end edge of the notch and no excessive load is placed on the spiral spring.
There is no deterioration or fatigue, and the desired accuracy can be maintained for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a front view of a cassette body incorporating a torque gauge according to the present invention, Fig. 2 is a sectional view of the torque gauge according to the present invention, and Fig. 3 is a perspective view showing the relationship between a scale plate and a stopper plate. It is. 1...Torque gauge, 2...Inner ring, 3...Outer ring, 4...
Spiral spring, 5... Scale plate, 8... Notch, 8a, 8
b...Terminal edge of notch, 9...Stopper plate, 9a, 9
b...Side edge of stopper plate.

Claims (1)

[Scope of utility model registration request] It consists of two inner and outer rings, the two wheels are connected by a spiral spring, a ring-shaped scale plate with scales is attached to one of the inner and outer rings, and a ring-shaped board with a pointer is attached to the other. In the torque gauge, an arc-shaped notch is formed on the periphery of the scale plate attached to either the inner or outer ring, and a stopper plate is protruded into the notch from the plate body attached to the other ring. 1. A torque gauge for a cassette-type torque meter, characterized in that both end edges of the notch and side edges of the stopper plate, which serve as contact surfaces, are bent in the same direction so as to face each other.