JPS6321797Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for moving the tension pulley from the driving pulley to the driven pulley, which loosens and tightens the tension pulley by the swinging displacement of the tension pulley as the operating lever is switched. This invention relates to a tension structure of a belt transmission mechanism that interrupts power transmission to the side.

[Problems to be solved by the prior art and the invention] In general, this type of belt transmission mechanism changes the tension and tension of the transmission belt by the swinging displacement of the tension pulley, so that the transmission belt can be moved from the drive pulley to the driven pulley. However, when the transmission belt is relaxed and power is not being transmitted, if the tension pulley is carelessly moved far away from the transmission belt and the transmission belt is freely relaxed, the driving Because the pulley is still being driven, the transmission belt is extremely likely to come off the pulley.For this reason, the tension pulley allows the drive pulley to slip and rotate freely against the loosened transmission belt, but the transmission belt It is necessary to restrict the belt to an appropriate position so that it cannot climb over the side surface of the pulley and come off. Conventionally, the position of the tension pulley when the belt was loosened was regulated by making the tension pulley swing toward the slack side come into contact with a special stopper fixed to the bottom surface of the frame or the cover. The vibrations caused by the tension of the transmission belt are severe, and the impact noise of the tension pulley on the bottom surface of the frame and the stopper is loud and extremely unpleasant, and the The tension pulley swings toward the tension side due to the repulsive force, causing the transmission belt to be re-tensioned, resulting in problems such as the transmission being not cut off immediately and resulting in an inching state. Therefore, there are some devices in which the stopper is made of an elastic body to elastically absorb the swinging of the tension pulley toward the relaxation side, but in this case, the structure becomes complicated and large, and the limited It lacks practicality because it is difficult to accommodate compactly in a transmission case of such a large size.

[Means for Solving the Problem] In view of the above-mentioned circumstances, the present invention includes a belt transmission mechanism that includes an elastic mechanism in the coupling mechanism between the operation lever and the tension pulley in order to elastically loosen and tighten the tension swing of the tension pulley. The purpose of this invention is to provide a tension structure for a belt transmission mechanism that can elastically catch a tension pulley by effectively utilizing the elastic force of this bullet. This is a belt transmission mechanism in which the transmission belt is loosened and tightened by the swinging displacement of the tension pulley accompanying switching of the operating lever, and power transmission is interrupted and interrupted. An elastic device is interposed in the connection mechanism leading to the tension pulley to elastically swing the tension pulley, and the connection mechanism is
The device is characterized in that it is arranged to receive the tension pulley in a relaxed state from below on the lower side of the swinging side of the tension pulley, which is when the tension pulley swings to the relaxation side, and is configured to function as a pulley receiving body.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is a driving pulley, 2 is a driven pulley, and a V-shaped transmission belt 3 is suspended between both pulleys 1 and 2. Reference numeral 4 denotes a tension pulley, which tensions and loosens the transmission belt 3 by vertically swinging the shaft 5 as a fulcrum, which will be described later. The power transmission from the driving pulley 1 to the driven pulley 2 is interrupted and disconnected, and the belt transmission mechanism is configured by these components, as is conventional.

The support shaft 5 is rotatably supported by a stay 7 screwed to the fuselage frame 6.
An actuating arm 8 and a tension arm 4a having a tension pulley 4 pivotally attached to the distal end thereof are each integrally fixed. The other end of an actuation wire 10, one end of which is connected to the operating lever 9, is connected to the actuation arm 8 via a coil bullet 11, and these constitute the connection mechanism of the present invention. . By switching the operation lever 9, the tension pulley 4 is moved to the transmission belt 3.
transforms into a power transmission state in which it is tightly fitted into the grooves of pulleys 1 and 2 as shown in Figure 3A, and a power non-operating state in which it is loosely fitted in the grooves in pulleys 1 and 2 as shown in Figure 3B. At this time, the tension pulley 4 receives the action of the coil elastic machine 11 to elastically oscillate the transmission belt 3, thereby smoothly intermittent power transmission in the belt transmission mechanism. I'm starting to do that. Furthermore, in the present invention, an actuation wire 10 that is a part of the connection mechanism
The other end side (in this embodiment, the connecting metal part with the coil bomber 11) is arranged so as to be located below the tension pulley 4, that is, on the lower side of the swing that relaxes the transmission belt 3. When the tension pulley 4 swings toward the relaxed side of the transmission belt 3, the tension pulley 4 is arranged to elastically abut on the tension pulley 4 from below and receive the swing. In the figure, 10a is an outer wire, and 12 is an outer receiver.

In the embodiment of the present invention configured as described above, the power is transmitted from the drive pulley 1 side to the driven pulley 2 side in conjunction with the switching operation of the operating lever 9, so that the tension pulley 4 moves up and down with the support shaft 5 as the fulcrum. It swings and can be disconnected by tightening or loosening the power transmission belt 3. However, in the present invention, the operating lever 9 is switched to disconnect the power transmission, and the tension pulley 4 is connected to the support shaft 5. When the tension pulley 4 is swung toward the relaxed side using the fulcrum as a fulcrum, the swung tension pulley 4 is elastically received from below by the actuating wire 10 connected to the coil elastic machine 11.
This allows the rocking energy to be absorbed. Therefore, even if the tension pulley 4 swings vigorously when swinging toward the relaxation side,
There is no generation of the large impact noise that conventionally occurs due to violent collision with stoppers, etc., and there is almost no repulsive force that would tension the transmission belt 3, making it quiet and quiet. Power transmission can be cut off smoothly. Furthermore, the member that elastically receives the tension pulley 4 is not a dedicated elastic stopper that is separately provided as in the past, but is used to elastically swing the tension pulley 4 toward and away from the transmission belt 3. Coil bullet machine 1 installed in
Since the pulley receiving body is structured so that the elastic force of 1 is effectively used and received as it is, there is no need for any special installation space for the elastic stopper as in the past, and this reduces the weight of the belt transmission mechanism. It can significantly contribute to compactness.

Here, in order to elastically catch the tension pulley 4 using the coil bomber 11, the tension pulley 4 is not received from the swinging lower side as in the present invention. It is conceivable to make it dangling and receive it directly by the biasing force, but in this case, if the actuating wire 10 or the coil bomb 11 has been stretched due to long-term use, the tension The pulley 4 continues to descend by an amount corresponding to the length of the extension, and as a result, the belt is likely to come off. However, in the present invention, since the tension pulley 4 is elastically received from the lower side of the swing, for example, when the actuation wire 10 is extended, the actuation wire 10 is bent at the contact part with the tension pulley 4. Therefore, even if the temporary operating wire 10 is extended, the position of the tension pulley 4 will not change in proportion to the extension, and even in this case, the transmission This can effectively prevent the belt 3 from coming off.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the point is that when the tension pulley is moved downward, the operating lever and the tension pulley are moved by a bullet. Therefore, in the above embodiment, for example, the coil elastic machine 11 itself does not need to receive the tension pulley 4 with the operating wire 10. It may be received by the tension arm 4a, the operating arm 8, etc.

[Operations and Effects] In summary, the present invention is constructed as described above, so that when the tension pulley is swung downward, which is the relaxed side, the coupling device having the elastic mechanism can move the pulley holder. It acts as a stopper and is received elastically from the bottom, which results in the generation of unpleasant impact noise and the impediment to quick and smooth power cutoff, unlike when using a conventional fixed stopper. There is no friction at all, and the tension pulley can swing quietly and smoothly toward the relaxed side. Moreover, the elastic receiving body of this tension pulley is constructed by effectively utilizing the connecting mechanism with a spring necessary to connect the operating lever and the tension pulley without using a dedicated elastic stopper. Therefore, there is no need to secure any dedicated installation space, and it can therefore contribute to making the entire belt transmission mechanism lighter and more compact. Furthermore, since the tension pulley is received from the lower side of the swing, even if the temporary connection mechanism is extended due to long-term use, the amount of displacement of the tension pulley will be small and will have almost no effect. Therefore, the present invention is
The connection mechanism allows the tension pulley to be elastically received at all times in the best condition.

[Brief explanation of the drawing]

The drawings show an embodiment of the tension structure of the belt transmission mechanism according to the present invention, in which FIG. 1 is a front view of the main part showing the power transmission state, and FIG. 2 is the main part showing the power non-transmission state. The front view and FIGS. 3X and 3Y are explanatory views showing the tensioned state and relaxed state of the transmission belt, respectively. In the figure, 3 is a transmission belt, 4 is a tension pulley, 9 is an operating lever, and 11 is a coil bullet.

Claims (1)

[Scope of utility model registration request] In a belt transmission mechanism in which power transmission is interrupted or interrupted by loosening or tightening a transmission belt by the swinging displacement of a tension pulley accompanying switching of an operating lever, elasticity is applied to the coupling mechanism from the operating lever to the tension pulley. The mechanism is used to elastically swing the tension pulley, and the connection mechanism is connected to the lower side of the tension pulley, which swings the tension pulley to the relaxed side. What is claimed is: 1. A tension structure for a belt transmission mechanism, characterized in that the tension structure is arranged so as to be received from the ground, and configured to function as a pulley receiving body.