JPH0414699Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotary seal that is connected to the rotating shaft of a tape winder and used for supplying air pressure to hold a tape winding core.

Conventional technology Conventionally, this type of rotary seal was the second type of rotary seal.
As shown in the figure, it is equipped with a rotor 1 that is continuous with the rotating shaft of the tape winder, and is rotatably mounted on a case 4 using ball bearings 2 and 3.
An inner tube 6 that supplies air pressure acting on the tape winding core from the elbow 5 side is inserted through the diameter of the rotor 1, and a carbon seal 8 is secured on the axis of the inner tube 6 with a detent pin 7. and a compression spring 9 are used.

Problems to be Solved by the Invention However, this rotary seal has the disadvantage that high-precision tension control cannot be performed because the rotational torque is large and exerts resistance on the rotating shaft of the tape winder, thereby interfering with the tape winder's drive.

Means for Solving the Problems In the rotary seal according to the present invention, two valve bodies are slidably disposed opposite to each other within the diameter of the cylinder, and at least one of the valve bodies has a protrusion that is connected to the rotating shaft. At the same time as mounting the protrusion, a passage is formed in the body of the protrusion for supplying the air pressure acting inside the cylinder to the rotating shaft within the opposing interval of each valve body, and a passage is formed between the protrusion and the other valve body. It is constructed by interposing steel balls that allow spherical contact with each other.

Function In this rotary seal, when negative air pressure is supplied into the cylinder, the valve elements are initially moved closer to each other. The air pressure acts on the tape winding core through an air passage formed in the protrusion. At this time, the two valve bodies are subjected to atmospheric pressure, so even if the valve bodies are close to each other, the steel balls are in spherical contact, so no large torque is generated on the valve body rotating via the protrusion. .

Embodiment The following will be described below with reference to FIG.

This rotary seal is connected to the rotating shaft 10 of the tape winder and supplies negative air pressure to suck and hold the tape core placed on the table of the tape winder.The air pressure is applied to two valve bodies 11, 12 are opposed to each other and are configured to be supplied via a cylinder 13 that is slidably provided within its diameter.

As the cylinder 13, a glass cylinder is preferably used so that the valve bodies 11, 12 such as carbon pistons can slide smoothly, and the valve bodies 11, 12 have a sliding contact area with the cylinder 13 to prevent air pressure leakage. It is best to incorporate a U-shaped cross section that can be made larger. A protrusion 14 is attached to at least one side 11 of these valve bodies 11 and 12 so as to be inserted through the valve body. A passage 15 for supplying air pressure to the rotating shaft 10 is formed in the protrusion 14 so as to communicate with the center of the axis that protrudes outward from the side surface located inside the valve body 11. The rotating shaft 1 of the tape winder is connected to the rotating shaft 1 of the tape winder via connecting pipes 16, 17 and a flexible tube 18 such as a rubber pipe.
0 is concatenated. Further, a steel ball 19 is mounted on the end face of the protrusion 14 located inside the valve body 11, and the steel ball 19 is attached so as to make spherical contact with the protrusion 20 provided on the valve body 12. It is being Note that the air pressure is fed into the diameter through an opening 21 formed in the side surface of the cylinder 13 corresponding to the corresponding spacing between the valve bodies 11 and 12.
The cylinder 1 is inserted into this opening 21 through a nipple 23 connected to a metal cylinder 22 that holds the cylinder 13.
It is configured to supply within the diameter of 3.

In the rotary seal configured in this way, the valve body 11 equipped with the protrusion 14 also rotates together with the rotating shaft 10 of the tape winder through the flexible tube 18 and the connecting pipes 16 and 17. Even if it comes into sliding contact with the protrusion 20,
Since a steel ball 19 received by the protrusion 14 is interposed between this time, the steel ball 19 is inserted into the protrusion 20.
By receiving the torque, large torque will not be generated. Also, when applying air pressure from a vacuum to the inside of the cylinder 13, the valve bodies 11 and 12
This acts to bring the tape winders closer to each other, so that a desired air pressure can be applied to the tape winding core via the rotating shaft 10 of the tape winder.

Effects of the invention As described above, according to the rotary seal according to the invention, it is possible to smoothly rotate the rotating shaft of the tape winder and apply the desired air pressure to the tape winding core. .

[Brief explanation of drawings]

FIG. 1 is a sectional side view showing a rotary seal according to the present invention, and FIG. 2 is a partially cutaway side view showing a rotary seal according to a conventional example. 10...Rotary shaft of tape winder, 11,1
2... Valve body, 13... Cylinder, 14... Protrusion, 15... Air passage, 18... Flexible tube, 19... Steel ball.

Claims (1)

[Claims for Utility Model Registration] (1) A rotary seal that is connected to the rotating shaft of a tape winder and used to supply air pressure to hold the tape winding core, with two valve bodies connected within the diameter of the cylinder. The valve bodies on at least one side of the valve body are equipped with a protrusion that connects with the rotating shaft, and the air pressure acting inside the cylinder within the facing interval of each valve body is applied to the rotating shaft. forming a supply passage within the body of the protrusion;
A rotary seal characterized in that a steel ball is interposed between the protrusion and the valve body on the other side so that they can come into contact with each other on a spherical surface. (2) The rotary seal according to claim 1, wherein the valve body has a U-shaped cross section. (3) The rotary seal according to claim 1, wherein the cylinder is formed of a glass cylinder that accommodates a carbon piston. (4) The rotary seal according to claim 1, wherein the rotating shaft is connected to a protrusion via a flexible tube.