JPH0112027Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tension adjustment device that is attached to an endless rotation transmission band stretched between rotating bodies on two axes and adjusts the tension thereof.

[Prior art]

Generally, as a rotation transmission device between two axes, in addition to a gear transmission type, an endless band transmission device such as a belt or chain is widely used. In this type of rotation transmission device, the side where the endless band runs from the driven side to the driving side is generally called the tension side because the endless band is stretched, and the side where the endless band runs from the driving side to the driven side is called the slack side because the endless band is slack. On this slack side, there is a tension roller that is biased toward the tension side of the endless band by a spring member or the like to restrict the flapping of the endless band and to maintain the endless band in a tensioned state when it is stretched. Alternatively, it is often fixed or provided. Furthermore, in cases where the distance between two axes is long or when rotation is to be transmitted at high speed, a guide for sliding the endless band in addition to the tension roller is installed along the running path of the endless band to eliminate vibration of the endless band. This is often done.

However, in a conventional tension adjustment device that includes such a tension roller and a guide, when the tension roller moves toward the side where the endless band is stretched due to the urging of the spring member or the tension adjustment, the tension roller slides against the guide until then. Since the endless band that had been attached to the guide separates from the guide, the guide must be moved to follow the tension pulley, and in order to properly attach it to the endless band, it is necessary to move and adjust both ends of the guide separately. be.

It takes a lot of effort and time to adjust the tension pulley and both ends of the guide each time the endless belt stretches, which not only reduces work efficiency but also leads to improper adjustment. If adjustment is neglected due to the hassle, the endless belt vibrates, causing uneven rotation and shortening the life of the endless belt.

[Summary of the idea]

The present invention was developed in view of the above points, and the slack side running portion of the endless band is connected to the rotating body on the frame side pin and the rotating body at the free end of the arm whose swing can be adjusted freely. are attached to each other, and one end of a guide body that slides the running end of the endless band between both rotating bodies is pivotally supported on the same axis as the arm side rotating body,
In addition, by slidably engaging the elongated hole at the other end with the pin of the rotating body on the frame side, the tension of the endless band can be adjusted with the guiding body always attached to the running end by simply adjusting the swinging arm. To provide a tension adjustment device for a rotation transmission endless band, which allows for appropriate adjustment of the tension, shortens the power adjustment time, and stabilizes rotation transmission through appropriate adjustment.
Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

1 and 2 show an embodiment of the tension adjusting device according to the present invention, FIG. 1 being a side view thereof, and FIG. 2 being a partially cutaway plan view thereof. In these figures, the driving shaft 2 is pivotally supported on the frame 23 of the machine.
Sprockets 4 and 5 as rotating wheels are respectively pivotally attached to the driven shaft 3 which is pivotally supported by the frame 24, and between these sprockets 4 and 5,
A chain 6, which serves as an endless belt for transmitting rotation, runs in the direction shown by arrow B in the figure as the drive side sprocket 4 rotates in the direction of arrow A. Therefore, the upper side of the chain 6 in FIG. 1 is the tight side, and the lower side is the slack side. Reference numeral 7 denotes a chain guide that slides and guides the inner side of the running end of the chain 6 on the tension side, and is supported by being fixed to a bracket 8 and a stud 9 on the frame 1 side with bolts.

Such a chain 6 is attached with a tension adjustment device 10 that adjusts the slack side running section to tighten it when it becomes slack. That is,
A pin 11 is implanted in the frame 23 in close proximity to the drive side sprocket 4, and a sprocket 12 as a rotating body that attaches the outside of the slack side running portion of the chain 6 is rotatably attached to the tip end of the pin 11. It is equipped with a shaft. Further, an arm shaft 13 is implanted in the frame 24 in the vicinity of the driven sprocket 5, and a swing arm 14 is attached to the tip of the arm shaft 13 so that the swing can be adjusted freely by splitting. Fixed. A sprocket 15 as a rotating body is rotatably attached to the free end of the swing arm 14 by a pin 16, and the inner side of the running end on the slack side is attached to the sprocket 15. The sprocket 15 is configured to tension the chain 6 by loosening the sprocket and rotating the swing arm 14 counterclockwise in FIG. Reference numeral 17 denotes a chain guide as a guide body formed in an L-shape, one end of which is rotatably supported by the pin 16, and a long hole 18 provided at the other end is connected to the tip of the pin 11. is slidably engaged with the section. The chain guide 17 is bent near the pin 16 and is prevented from coming off the pin 16 by a snap spring 19. The chain guide 17 slides the slack side running portion of the chain 6 running between the sprockets 12 and 15, and also ensures that the chain 6 always attaches correctly to the chain guide 17 even when the swing arm 14 swings. It is configured. A cover 20 is formed in a plate shape and is bolted to the stud 21 on the frame 23 side and the stud 22 on the frame 1 side to cover the running portion of the chain 6.

With the above configuration, when the driving shaft 2 rotates in the direction of arrow A, the chain 6 travels in the direction of arrow B, and the rotation of the driving shaft 2 is transmitted to the driven shaft 3. In this case, the slack running portion of the chain 6 is attached to the sprocket 12, and is kept under tension by being pushed downward by the sprocket 15 and fixing the swinging arm 14 by splitting it. The running section between the sprockets 12 and 15 runs in sliding contact with the chain guide 17, and the tight side running section also runs in sliding contact with the chain guide 7.

If the chain 6 is stretched and slack, loosen the clamping of the swing arm 14 and rotate it counterclockwise in FIG. 1, so that the slack side running portion of the chain 6 is tightened. Tension adjustment is completed by fixing the split of the swing arm 14. In this case, the chain guide 17 rotates around the pin 11 due to the rotation of the swing arm 14, and rotates while holding the chain 6 between the other sprocket 15 and the other end of the chain guide 17. So,
Regardless of the swinging of the swinging arm 14, the chain 6 is always in correct sliding contact with the chain guide 17.
Therefore, even after the tension is adjusted, the slack side of the chain 6 does not flap. Furthermore, the chain guide 17 moves in the longitudinal direction due to the swing of the swing arm 14, but since the elongated hole 18 is provided, this slides between the pins 19, so that movement of the chain guide 17 is not obstructed. do not have.

In this embodiment, an example is shown in which the endless band for rotation transmission is a chain, but this may also be a belt.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the tension adjustment device for an endless belt for rotation transmission,
The slack side running portion of the endless band is attached to the rotating body on the frame side pin and the rotating body at the free end of the arm whose swing can be adjusted freely on the outside and inside, respectively, and the running end of the endless band is attached between the two rotating bodies. The tension of the endless band can be adjusted by pivoting one end of the guide body that makes sliding contact coaxially with the arm-side rotating body, and slidably engaging the elongated hole at the other end with the pin of the frame-side rotating body. In this case, the rotating body that applies tension to the endless band and the guide body that slides the endless band can be adjusted simultaneously by operating only one swing arm, reducing adjustment time and improving work efficiency. You can measure improvements and reduce effort. In addition, regardless of the tension adjustment, tension is applied to the slack side of the endless band by the rotating body, and the running end of the endless band on the slack side slides correctly against the long guide body as it runs, so the endless band does not flap around. , the durability of the endless belt is improved, and the vibration of the machine is reduced, ensuring stable machine function.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the tension adjusting device for an endless band for rotation transmission according to the present invention, FIG. 1 being a side view thereof, and FIG. 2 being a partially cutaway plan view thereof. 1... Frame, 2... Driving shaft, 3... Driven shaft, 4, 5... Sprocket, 6... Chain,
10...Tension adjustment device, 11...Pin, 12,1
5... Sprocket, 14... Rocking lever, 16
...Pin, 17...Chain guide, 18...Slot hole.

Claims (1)

[Scope of utility model registration request] The outer side of the slack side running part of the endless belt for rotation transmission stretched between rotating wheels on two axes is attached to the rotating body on the frame side pin provided near one rotating wheel, and near the other rotating wheel. A rotary body is pivotally attached to the free end of a swing-adjustable arm provided in the arm, and the rotary body is attached to the inside of the slack side running portion, and the outer running end of the endless band that runs between the two rotary bodies. An endless rotary transmission device characterized in that a guide body for sliding contact is provided with one end pivoted coaxially with the rotating body on the arm side and a long hole at the other end slidably engaged with the pin. Band tension adjustment device.