JPH054113Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tape guiding guide roller employed in tape decks such as video decks, cassette tape decks, and digital tape decks.

[Prior Art] A guide roller used in a conventional video deck or the like has a structure as shown in FIG. In other words, for example, an upper flange 2 and a lower flange 3 are attached to a shaft 1 fixed to a base plate 10 of a deck, and a roller 4 is attached rotatably around the shaft 1 between the flanges 2 and 3. It is something that you have. The guide roller shown in FIG. 1 is constructed by inserting a spring 5 into a shaft 1 provided on a base plate 10 of a video deck, a lower flange 3, a bearing 6, and a ring-shaped spacer 7.
are fitted one after another, and then the roller 4 is mounted so as to cover it, and the bearing 8 is further inserted between the shaft 1 and the roller 4, and then a female thread 2a with an upper flange 2 formed on its inner surface is provided on the top of the shaft 1. It is installed by screwing into the male screw 1a that has been installed. By tightening the screws of the upper flange 2, the flange 2, roller 4, bearings 6, 8, spacer 7, and flange 3 are pushed down as a whole against the spring 5. In other words, the height of the roller is adjusted by moving each part of the guide roller up and down depending on the degree of tightening of the screw on the upper flange. After determining the height of the roller in this manner, the locking set bolt 9 is screwed into the upper flange to lock it.

Such conventional guide rollers have an extremely large number of parts, use expensive spacers, and are complicated to assemble, so they are very expensive. Furthermore, since bearings are used, there are other disadvantages such as the need for lubrication.

Therefore, in order to eliminate these drawbacks, a roller 13 is rotatably attached to a sleeve 12'' with a flange 12''a as shown in FIG. 4, and an upper flange 11' is press-fitted and fixed to the upper end of the sleeve 12''.

By this, flange 11' and flange 1
The roller 13 is rotatably held between the shaft 1 and the shaft 1, and the sleeve 1 is attached to the screw 1a of the shaft 1.
A guide roller 4 has been proposed that is fixed to a shaft 1 attached to a base 10 by screwing together a screw 12''b formed at the upper end inside the guide roller 2''.

However, such conventional examples have the following drawbacks.

In order for the roller to rotate smoothly, the rotational torque of the roller must be reduced, and as shown in Figure 5, the inner diameter of the roller φA
In other words, the outer diameter of the sleeve 12'' must be made as small as possible.

One possible method for reducing the outer diameter of this sleeve is to reduce the diameter of the shaft 1, but there is a limit in terms of strength and performance. A possible solution to this problem is to reduce the sleeve wall thickness φa.

However, according to this method, when the upper flange 11' is press-fitted into the sleeve 12'', the sleeve 12'' is easily deformed, and the sleeve thread diameter becomes smaller than the thread diameter of the shaft 1.
This may cause problems such as damage to the screw 12''b of the sleeve 12'' or failure to screw the sleeve 12'' onto the shaft 1.

As shown in FIG. 5, the inner diameter of the upper flange 11' is simply press-fitted into the sleeve 12'';
In order not to lock the roller 13, a jig is required to measure the L dimension when press-fitting the upper flange.

As shown in FIG. 6, the sleeve 12'' includes:
It is necessary to drill a hole with an inner diameter φC corresponding to the shaft diameter and a diameter φB corresponding to the thread diameter of the shaft, and the longer the l dimension, the more difficult the drilling becomes.

[Problems to be solved by the invention] The present application eliminates the above-mentioned drawbacks, and the parts can be easily processed.
Moreover, it is an object of the present invention to provide a guide roller that has a small number of parts and is easy to assemble.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the guide roller of the present invention has a threaded shaft attached to a base, a flange portion on one end side, and is inserted into the shaft. a sleeve with a tap, a flange with a tap in which a tap is formed and a recess into which the other end of the sleeve is press-fitted; and a flange with a tap that is rotatably held around the sleeve between the flange portion and the flange with a tap. The other end of the sleeve is press-fitted into a recess of a flange with a tap, and the tap of the flange with a tap is screwed onto a shaft with a screw. .

[Example] An example of the present invention is shown in FIGS. 1 and 2.
Note that the same operating members as in the conventional example are given the same numbers and detailed explanations thereof will be omitted.

FIG. 1 is a sectional view of a guide roller showing an embodiment of the present invention, in which a threaded shaft 1 is fixed to a substrate 10, and a screw 1a is cut at the tip thereof.

The sleeve 14 has an inner diameter approximately corresponding to the outer diameter of the shaft 1, and has a flange portion 14a integrally formed at its lower end. A roller 13 is rotatably inserted around this sleeve 14, and a sleeve tip 14b protrudes upward from the roller 13.
is press-fitted and fixed into a recess 15b formed on the lower surface of the upper flange 15 with a tap, which has a tap 15a cut on the inner diameter, and the roller 13 is rotatably held between the flange portion 14a of the sleeve 14 and the upper flange 15 with a tap. do.

Furthermore, insert the inner diameter of the sleeve 14 into the shaft 1, screw the tap 15a of the upper flange with tap 15 onto the screw 1a at the tip of the shaft, and after adjusting the height, connect the shaft 1 and the upper flange with tap 15 with adhesive or the like. to be fixed.

The push-up spring 16 urges the sleeve 14 upward, and is used to prevent displacement during height adjustment.

FIG. 2 is a sectional view of a guide roller showing another embodiment of the present invention, and is an example in which the thickness D of the upper flange 15 with a tap cannot be made sufficiently depending on the position of the roller 13. That is, the outer diameter of the lower side of the upper flange 15 with a tap is made thinner to form a stepped portion 15c, and the stepped portion 1
5c, the upper end of the roller 13 is extended.

[Effects of the invention] As described above, according to the invention, the distance between the lower flange and the upper flange is reduced by the recess of the upper flange.
Not only does this eliminate the need for a jig when press-fitting the upper flange, but the inner diameter of the sleeve, which is long in the height direction, does not change and is in a straight line, making it easy to drill holes. Since there is no such thing, installation workability is also good.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a guide roller showing one embodiment of the present invention, Fig. 2 is a sectional view of a guide roller showing another embodiment of the invention, and Fig. 3 is a sectional view of a guide roller showing a first conventional example. , FIG. 4 is a sectional view of a guide roller showing a second conventional example, and FIGS. 5 and 6 are partial sectional views for explaining the conventional example. 1... Shaft, 1a... Screw, 13... Roller, 14... Sleeve, 14a... Flange portion, 15... Upper flange with tap, 15a... Tap, 15b... Recessed portion, 15c... Stepped portion, 16...
...Pushing spring.

Claims (1)

[Claims for Utility Model Registration] (a) A threaded shaft attached to a base; (b) A sleeve having a flange on one end and inserted into the shaft; (c) A tap inside. (d) a roller rotatably held around the sleeve between the flange portion and the tapped flange; , wherein the other end of the sleeve is press-fitted into the recess of the flange with a tap, and the tap of the flange with a tap is screwed onto a threaded shaft. roller.