JPH0245558Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Field of Industrial Application" The present invention relates to the improvement of a dedicated pulley on which a metal belt for power transmission is hung, which is used, for example, in OA equipment.

``Prior Art'' When power is transmitted by hanging a metal belt between a pair of pulleys, the transmission efficiency is determined by the state of friction between the metal belt and the pulleys.

For this reason, conventionally, as shown in Japanese Utility Model Application Publication No. 53-36678, the entire pulley is made of a magnetic body, and the magnetic pulley and a metal belt are magnetically coupled to reduce the frictional force between them. It has been proposed that the transmission efficiency is improved by generating this and preventing the belt from idling.

However, since magnets usually exert strong magnetic force at their own magnetic poles, constructing the entire pulley from a magnetic body means that both ends of the belt-hanging outer circumferential surface of the pulley become magnetic poles. Therefore, reliable magnetic coupling of the metal belt cannot be expected unless the width of the metal belt itself is set to be wide enough to be hung over the entire area between the magnetic poles at both ends of the pulley.

Therefore, the width of the metal belt used in the above-mentioned magnetic pulley must be made wider than necessary, and as a result, the power transmission device itself tends to become larger, and the pulley as a whole becomes larger. If the pulley is made of a magnetic body, the cost of the pulley itself will be high.

Therefore, an improved pulley shown in FIGS. 1 and 2 can be considered as a solution to this problem. That is, unlike the above-mentioned pulley which is entirely made of magnets, the pulley body is molded from a synthetic resin material, and small magnet bodies 2 are inserted intermittently at regular intervals in the circumferential direction of the belt hanging outer peripheral surface 1. This is a pulley P configured to be disposed at.

Therefore, in this improved pulley P, the plurality of magnet bodies 2 arranged intermittently on the belt hanging outer circumferential surface 1 are individually and independently arranged on the outer circumferential surface 1 with their respective magnetic poles NS. Since a strong magnetic force can be exerted, even if the metal belt itself does not have the width to be hung over the entire hanging outer peripheral surface 1 of the pulley P, it is possible to reliably magnetically couple with each magnet body 2. Therefore, the width of the metal belt can be suppressed to the minimum necessary, contributing to the miniaturization of the power transmission device itself, and also contributing to reducing the cost of the pulley P itself.

``Problem that invention attempts to solve'' However, regarding this improved pulley P,
Although the above-mentioned advantages can be obtained by disposing the magnet bodies 2 intermittently on the belt hanging outer circumferential surface 1, new problems arise in actual manufacturing.

That is, in order to intermittently arrange the magnet bodies 2 on the belt hanging outer circumferential surface 1, long grooves are formed at regular intervals on the outer circumferential surface 1 of the pulley body made of synthetic resin, and each magnet body is 2 into a rectangular shape that matches the size of the long groove, and each magnet body 2 must be individually fixed within the long groove, making the manufacturing process unnecessarily complicated and reducing production efficiency. In addition to having major problems,
Since dimensional accuracy is required for the long groove portion and the magnet body 2, it cannot be denied that it will be difficult in terms of processing accuracy.

Moreover, if dimensional accuracy is not achieved in the long groove portion and the magnet body 2, unnecessary unevenness will occur on the belt hanging outer circumferential surface 1, so in this case, additional grinding processing etc. will be required to correct this. Therefore, from this point of view as well, the manufacturing process becomes even more problematic.

``Means for Solving the Problems'' Therefore, the present invention was developed to effectively solve the problems of this improved pulley. Assuming a pulley for a metal belt is installed intermittently, a plurality of disc-shaped magnet bodies, a plurality of disc-shaped resin spacer bodies having the same diameter as the magnet bodies, and a large-diameter A configuration is adopted in which a resin spacer body is interposed between each of the magnet bodies, and the pair of resin guide bodies are arranged on both sides of the resin spacer body.

``Function'' Therefore, in the present invention, the magnet body, the resin spacer body, and the resin guide body are each molded separately, and the resin spacer body of the same diameter is placed between the plurality of disc-shaped magnet bodies. By placing a pair of resin guide bodies on both sides of the metal belt, which will serve as guide walls for the metal belt, and fixing these bodies on top of each other on the same center line, the magnetic body can be attached to the outer periphery of the belt. It becomes possible to assemble pulleys arranged at regular intervals on a surface very easily.

``Example'' Hereinafter, the present invention will be described in detail based on an example illustrating the present invention.The pulley P according to this example is different from the above-mentioned improved pulley, and is formed into a disk shape as shown in FIG. It consists of a plurality of magnet bodies 2, a plurality of resin spacer bodies 3 formed into disk shapes having the same diameter as the magnet bodies 2, and a pair of resin guide bodies 4 formed into large diameter disk shapes. , a resin spacer body 3 having the same diameter is placed between each disc-shaped magnet body 2.
By interposing each body individually and arranging a pair of large-diameter resin guide bodies 4 that serve as guide walls for the metal belt on both sides, and assembling each body 2, 3, and 4 on the same center line, the structure shown in FIG. As shown in B, pulley P
Disc-shaped magnet bodies 2 are disposed intermittently at regular intervals in the width direction of the belt hanging outer circumferential surface 1 of the belt.

Therefore, when the pulley P of this embodiment is used, each magnet body 2 intermittently arranged on the belt hanging outer circumferential surface 1 of the pulley P is individually independent in the width direction on the outer circumferential surface 1. , each magnetic pole N,
S exerts a strong magnetic force, so even if the width of the metal belt is narrowed, the metal belt itself will magnetically couple with each magnet body 2 and generate a reliable frictional force between them. It becomes possible to do so.

However, in the present embodiment, the magnetic body 2 is finally attached to the belt hanging outer peripheral surface 1 of the pulley P.
Even if the pulley P is disposed intermittently, the three parts constituting the pulley P, that is, the magnet body 2, the spacer body 3, and the guide body 4, are formed separately into disk shapes of desired diameters, and these three parts are By simply overlapping and fixing 2, 3, and 4 on the same center line, the pulley P with the magnetic bodies 2 arranged intermittently on the belt hanging outer circumferential surface 1 can be assembled instantly.
The manufacturing process itself becomes easy.

Moreover, since the magnet body 2, spacer body 3, and guide body 4 are molded individually and separately, it is possible to mold them all with high dimensional accuracy, so dimensional accuracy cannot be obtained. As a result, there is no need to worry about unnecessary unevenness occurring on the belt hanging outer circumferential surface 1, and there is no need for grinding or the like to correct this.

"Effects of the Invention" As described above, the present invention consists of a pulley itself consisting of a disk-shaped magnet body, a resin spacer body, and a resin guide body, and a resin spacer of the same diameter between the plurality of magnet bodies. Since the pulley is assembled by placing a large-diameter resin guide body on both sides of the pulley, it takes advantage of the advantages of the conventional improved pulley while improving its manufacturing and processing. As a result, a significant improvement in production efficiency can be expected.

[Brief explanation of the drawing]

1 and 2 are perspective views showing a conventional improved pulley, FIG. 3A is an exploded perspective view of a pulley according to an embodiment of the present invention, and FIG. 3B is a perspective view showing the assembled state. It is. P...Pulley, 1...Belt hanging outer peripheral surface, 2
...Magnetic body, 3...Resin spacer body, 4
...Resin guide body, N/S...Magnetic pole.

Claims (1)

[Scope of Claim for Utility Model Registration] A pulley for a metal belt in which magnetic bodies are disposed intermittently at regular intervals on the outer circumferential surface of the belt, including a plurality of disc-shaped magnetic bodies, and the magnetic bodies. It consists of a plurality of resin spacer bodies molded into disk shapes with the same diameter and a pair of resin guide bodies molded into large diameter disk shapes, with a resin spacer body interposed between each of the magnet bodies. A pulley for a metal belt, characterized in that a pair of resin guide bodies are arranged on both sides of the pulley.