JPS5824041Y2 - Belt automatic tension adjustment device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in an automatic belt tensioning device.

In a mechanical device using a winding transmission means, maintaining belt tension constant is an essential requirement for stable operation.

This demand is especially significant when the belt itself is to perform some kind of work.

Various tension adjustment devices have been proposed in the past, ranging from simple ones to those using computers, but there seem to be few simple, stable, and safe devices.

For example, FIG. 1 shows one example of the simplest conventional tension adjustment device.

In this system, a loop portion 2 is formed in the running system of the belt 1, a roller 3 is inserted into the loop portion 2, and a tension applying means, that is, a weight 4 is suspended from the loop portion 2, so that the roller 3 has a tension adjustment function. be.

However, with this device, there is a risk that the weight 4 will be swung up abnormally due to the strong tension when the belt 1 is started, and that the weight 4 will scatter or fall in the event of an accident when the belt 1 is cut or the running system is separated.

Further, the roller 3 and the weight 4 often resonate with the small vibrations of the belt 1, causing large shaking.

This invention was devised in view of these points,
The device itself has a so-called "lever" structure, and a damper is attached to the tension arm, which is the "lever arm", in order to solve the above-mentioned drawbacks.

The details will be explained below based on the drawings.

FIG. 2 shows a first embodiment of the device according to the present invention.

First, the structure will be explained. 11 is a belt, 12 is a loop portion, and 13 is a tension adjustment roller, and there is no particular difference from the conventional one.

Conventionally, a weight 14 was attached directly to this roller 13, but the first feature of the present invention is that tension is applied to this via a "lever" device.

That is, 15 is a tensioning arm swingably supported by a frame 16 via a fulcrum 11, and has a tensioning means (in this case, a weight) 4 approximately at the center of the tensioning arm 15.
A roller 13 for tension adjustment is provided at the tip.

The second feature of the present invention is that a damper 18 is attached to this tension arm 15.

This damper 18 brakes the swinging of the tension arm 15 in a so-called integral manner, and is provided between the tension arm 15 and the frame 16.

3 to 5 show second to fourth embodiments of the apparatus according to the present invention, respectively.

As is clear from each figure, tension is applied by applying the "lever" function, and the dampers 28, 38, 4
8 are attached to the tension arms 25, 35, 45.

Here, the tension applying means 34, 44 uses a coil spring instead of a weight, but the function itself is not particularly changed.

Each of these examples is the fulcrum of the so-called "lever", the point of emphasis,
Since the points of action are provided at different positions, the selection should be made appropriately depending on the situation, but it is not limited to these examples.
It goes without saying that further various embodiments may be employed.

Since these configurations are not fundamentally different from those of the first embodiment, parts having the same functions are given the same suffix numbers and the explanation will be omitted.

Next, the action will be explained.

For convenience of explanation, the first embodiment (FIG. 2) will be described as an example.

The tensioning arm 15 is always kept in the direction of arrow A by the tensioning means 14.
The belt 1 is always pulled with a constant force through a tension adjustment opening 13 attached to its tip.

As a result, this tensile force acts on the belt 1 over the entire running system, and if the belt 1 becomes loose for some reason, the tension arm 15 moves in the direction of arrow A, that is, in the direction of the loop portion 12. It is displaced and stabilized in the direction of increasing the size of the loop portion 12, and conversely, when the belt 1 is strongly tensioned, it is displaced and stabilized in the direction of arrow B, that is, the direction of decreasing the size of the loop portion 12,
A tension commensurate with the tension applying means 14 is always applied to the belt 1.

Although the tension applying means 14 here uses a weight,
Of course, even if the weight itself remains unchanged, the set applied tension can be increased or decreased by changing its attached position (i.e., the ratio of 11 and 12).

The above function causes the tension arm to swing abnormally and leaves the weight etc. in a very unstable state when the belt 1 is started or cut, but in this invention, the function of the damper 18 Their movements are braked.

Due to its unique function, the damper 18 shows almost no resistance to slight fluctuations of the tension arm 15 during normal operation, and smoothly applies a constant tension, and prevents sudden fluctuations of the tension arm 15 during startup, abnormalities, etc. It provides strong resistance only to rocking, and allows the displacement to occur gradually.

These effects are the same in each embodiment.

As explained above, according to the device according to the present invention, since the tension is applied through the so-called "lever" structure, whether the belt running system is in the horizontal plane or in the vertical plane, The configuration can be completely freely selected, and the applied tension can be freely set by changing the positional relationship of the tension applying means, fulcrum, and roller, which replaces the conventional setting of applied tension using only the weight of the weight. In comparison, the degree of freedom is extremely large.

In addition, this "lever" structure makes it possible to attach a damper, and the function of this damper allows the tension arm to gradually swing rapidly during startup and abnormal conditions, ensuring stability and safety.

Moreover, this damper provides almost no resistance to minute displacements during normal operation, and does not adversely affect the "tension adjustment action" itself.

Furthermore, the existence of a damper contributes to the stable running of the belt by absorbing the small vibrations of the belt through the tension arm, and also prevents the weights, springs, etc. from resonating with these vibrations and causing unnecessary large swings of the rollers. This device also contributes to the prevention of such problems, and the benefits obtained by this device are enormous.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional automatic tension adjustment device, and FIGS. 2 to 5 show first to fourth embodiments of the device according to the present invention, and FIGS. is a front view of the device, 4th
FIG. 5 is a perspective view of the device. In the figure, 11, 21, 31, 41... Belt, 1
2.22, 32, 42...Loop part, 13゜2
3.33,43...Roller, 14,24,34
゜44...Tension applying means, 15, 25, 35,
45...Tension arm, 16, 26, 36, 46
...Frame, 17, 27, 37, 47...
...Fully point, 18°28.38,48...Damper.

Claims (1)

[Scope of Claim for Utility Model Registration] In an automatic belt tension adjustment device in which a loop portion is formed in the belt running system and a tension adjustment roller is inserted into the loop portion, the belt can swing freely via a fulcrum. An automatic tension adjustment device for a belt, characterized in that the tension adjustment roller is provided on a tension arm that is supported and includes tension applying means, and the tension arm is provided with a damper for regulating swing.