JPS5917027A - Stopping device of rotary unit to shaft - Google Patents

Abstract

PURPOSE:To easily perform centering between a rotary unit and rotary shaft, by equipping a slot in the axial direction of the rotary shaft further fitting internal and external bushes, in which tapered faces in a reverse direction to each other are formed to each contact surface, to a clearance between the rotary unit and the rotary shaft. CONSTITUTION:To fix a pipe shaped rotary unit 30 to be externally inserted to a rotary shaft 18 in both ends of the rotary unit onto said shaft, a slot 42 is equipped in the axial direction of the rotary shaft. Then an internal bush 36b and an external bush 36a, each contact surface of which is formed to a 7 deg. or less tapered face 44 in a reverse direction to each other, are closely fitted to a gap between the rotary unit 30 and the rotary shaft 18 in both ends of the rotary unit 30.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating body shaft raising device, and more particularly to a rotating body shaft stopping device that can easily center a pipe-shaped rotating body and a rotating shaft.

Conventionally, several methods have been considered for fixing a pipe-shaped rotating body, such as a paper feed roller in a printer or a copying machine, to a rotating shaft. For example, FIG. 1 shows a cross-sectional view in which a rotating shaft is fixed to a paper feed roller.

Reference numeral 10 denotes a rotating body in which rubber 14 is attached to the outer peripheral surface of an aluminum pipe 11.
The rotary shaft 18 is connected to the rotary shaft 18 through a bush 16 having a tapped hole 20 threaded toward the center at an appropriate location on the outer peripheral surface of the detailed portion 17.
are fixed with headless screws 22. Note that the rotating body 10
The bushing 16 and the bushing 16 are formed as a tight fit, and the bushing 16 and the rotating shaft 18 are formed as a loose fit.

Since the conventional example is configured as described above, it is difficult to center the rotating body and the rotating shaft, and eccentricity is likely to occur.

Therefore, there is a drawback that paper feeding cannot be carried out smoothly. Furthermore, manufacturing costs are high.

In another conventional example, as shown in FIG. 2, knurls 24 are cut in the fitting surfaces where the rotating body 10 and the bushing 16 fit, and the fitting surfaces where the bushing 16 and the rotating shaft 18 fit. The bushing 16 is then pushed into the rotating body 10, and the rotating shaft 18 is further pushed into the bushing 16. Note that the eight-rotating body 10 and the bush 16 and the bush 16 and the rotating shaft 18 are formed to fit snugly, respectively.

Since the above-mentioned conventional example is constructed as described above, stress concentration may occur, causing deformation of the roller surface, and there is also a problem in centering accuracy.

Furthermore, since knurls are cut on each fitting surface, the number of manufacturing steps increases, which increases manufacturing costs.

The present invention has been made in view of the difficulty in writing, and provides a double bushing with a double structure as a fitting device for a rotating body shaft 1, which has good centering accuracy between a pipe-shaped rotating body and a rotating shaft, and is low in cost. The purpose of the invention is to include a pipe-shaped rotating body that is extrapolated to the rotating shaft, and a rotating body and the rotating shaft at both ends of the rotating body so that the rotating body is fixed on the rotating shaft at both ends. The fixture consists of an inner bushing and an outer bushing that are tightly fitted into the gaps, and the inner bushing and the outer bushing each have a slot T in the axial direction of the rotating shaft.
Furthermore, the contact surfaces of the inner bushing and the outer bushing are tapered at an angle of 7 degrees or less in opposite directions.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

@3 In figure 3, 30 is rubber 14 on the entire circumference of metal tube 12.
It is a pipe-shaped rotating body with . Both ends of this rotating body 30 are fixed to the rotating shaft 18 by double bushings 36 of a double structure, which are rotating body shaft stopping devices.

The double bushing 36 has a double structure consisting of an outer bush 36a and an inner bush 361+, and the outer bush 36a
A neck portion 38 is formed at one end, and this jaw portion 38
When the fitting portion 40 of the outer bushing 36a is fitted into the rotating body 30, it hits the end of the metal tube wall and is blocked. Further, the inner circumferential surface of the outer bush 36a is tapered from the jaw portion 38 toward the other end, and a slot 42 is provided in the axial direction of the outer bush 3'6a. On the other hand, the outer peripheral surface of the circular side bushing 36b is
A is tapered in the opposite direction to the inner circumferential surface of the inner bush 36a, and the inner bush 36b is also provided with a groove: I
A V1j bus 42 is provided. In addition, the outer bush 36
It is preferable that the inclinations of the tapered surfaces 44 of the inner bushing 36a and the inner bushing 36b are the same in order to firmly fix the rotating body 30 on the rotating shaft 18. There is no risk of it coming off even if there is a shock, but it is preferably about 1 degree.

-1.tri of the above example! (The tJ fitting method is to first insert the outer bushing 36a inside both ends of the rotary body 30, push it into place up to the part 38, and then pass the rotary shaft 18 through the rotary body 30. “t to inner bushing 36
1) and further push the inner bushing 3611 along the taper of the inner circumferential surface of the outer bushing 36a, thereby firmly fixing the rotating shaft 18. This is inner bushing 36I
) along the tapered surface 44 of the outer bushing 36a, elastic deformation in the circumferential direction is possible due to the slots 42 provided in the double bushing 36, and the stress is dispersed, so that the rotating body 30 It prevents deformation and is firmly fixed on the rotating shaft 18. Furthermore, since it is pressed along the tapered surface 44, accurate centering is possible. In addition, the rotating body 3
0 has a certain length in the axial direction, but the rotating body 3
Since accurate centering is possible at both ends, there is no risk of eccentricity.

FIG. 6 shows another embodiment. In the case of this embodiment, the contacting tapered surfaces of the outer bush 36a and the inner bush 36b shown in the previous embodiment are formed in opposite directions, and the outer bush 36b is formed in the opposite direction.
While the neck portion 38 of 6a may be eliminated, a stopper portion 46 may be provided inside the inner bush 36b to fulfill the function of the neck portion 38. Note that the rotating shaft 18 also has a stepped portion 4.
8 is provided, and the stopper portion 46 is formed so as to be stopped by the stepped portion 48 when the inner bushing 36b is fitted onto the rotating shaft 18.

The installation method of the above embodiment is as follows: First, the inner bushing 36b is pushed in from both ends of the rotating shaft 18, and then the rotating shaft 18 is passed through the rotating body 30, and the outer bushing 36a is inserted from both ends of the rotating shaft 18. The rotating body 30 is firmly fixed to the rotating shaft 18 by fitting the inner bushing 361 and pushing the outer bushing 36a along the tapered outer peripheral surface of the inner bushing 361.

Even if the structure is formed as described above, it is possible to produce the same effects as in the above embodiment.

In addition, as shown in the above two embodiments, even if the circular saw is operated by the double bushings 36 fitted to both ends of the rotary body 30, the other double bushing 36 is subjected to a force in the tightening direction. Since this means that the double bushing 36 has five colors, there is no risk that the rotating shaft 18 will come off or that the rotating body 30 will shift in the axial direction.

Further, by using the rotor shaft 11 of the present invention, it is possible to eliminate the intermediate portion of the rotor shaft 18 as shown in FIG. This is the double Bunyu 36 of the present invention.
This is because, while firmly fixing the rotating shaft 18, accurate centering is possible. It also saves monthly expenses.

The second embodiment relates to a double bushing 36 for fixing a pipe-shaped circular rotating body 30 to a rod-shaped rotating shaft 18, but other embodiments will be described below. FIG. 8(a) is a sectional view showing a state in which the circular rotating body 50 is fitted onto the hexagonal rotating shaft 52, and FIGS. 8(b) and 8(C) are the outer bushings of the double bushing 36. 136a and inner bush 1
36b is shown. Note that the inner shape of the inner bush 136h is hexagonal. FIG. 9(a) is a sectional view showing a state in which the hexagonal pipe 54 is fitted onto the circular rotating shaft 18. Figure 9 (
b) and (C) respectively show an outer bush 236a and an inner bush 236b of the double bush 36. Note that the outer shape of the 1714 portion 56 of the outer bushing 236a is hexagonal, and the inner shape is circular. FIG. 10(a) is a sectional view showing a state in which the hexagonal pipe 58 is fixed to the hexagonal rotating shaft 60. 10(b) and 10(C) respectively show an outer bush 336a and an inner bush 336b of the double bush 36. In addition,
The fitting portion 62 of the outer bushing 336a has a hexagonal outer shape and a circular inner shape, and the inner bushing 336b has a circular outer shape and a hexagonal outer shape.

Note that the rotating body and rotating shaft are not limited to hexagonal or circular shapes, but may also be triangular, quadrangular, pentagonal, or pentagonal. Furthermore, each of the ten embodiments achieves the same effects as the first embodiment.

Since the present invention is configured as described above, deformation of the bush is absorbed by the slot when fixing a pipe-shaped rotating body to the rotating shaft, and stress is dispersed over the entire circumferential surface. The rotating body can be firmly fixed on the rotating shaft without fear of deformation, and centering can be easily performed. Also, jI2. There is no risk of it being damaged or removed. Furthermore, since the structure is in a cylinder, manufacturing costs are low and other significant effects are achieved.

Although the present invention has been described above with reference to preferred embodiments,
The double bushing of the present invention is not limited to the centering of a rotating shaft of a pipe-shaped rotating body, and can of course be modified in many ways without departing from the spirit of the invention.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the conventional example, FIG. 3 is a sectional view showing the embodiment of the present invention, FIG. 4 (a) + (+1) is a front view and sectional view of the outer bush, and FIG. Figure (aL (+1) is a front view and sectional view of the inner bushing, Figures 6 and 7 are sectional views showing other embodiments of the present invention, and (a) of Figures 8 to 10).
, (b)I (C') are a sectional view and a front view of an outer bush and an inner bush, respectively, showing other embodiments of the present invention. 10... Rotating body, 11... Aluminum pipe. 12...metal tube, 14...rubber, 16...
... Bush, 17 ... Neck, 18 ... Rotating shaft, 20 ... Tapered hole, 22 ... Headless screw,
24...Rolet h, 30...Rotating body, 36...Double bushing, 36a...Outer bushing, 36b...Inner bushing, 38...
...Nuclear part, 42...Slot. 44...Tapered surface, 46...Stopper part, 48
...Stepped portion, 50...Circular rotating body, 52.
... Rotating shaft, 54 ... Hexagonal pipe, 56
...Fitting part, 58...Hexagonal pipe,
62... Fitting portion, 136a... Outer bushing, 136b... Inner bushing, 236a
...outer bushing, 236b...inner bushing, 336a...outer bushing. 336b...Inner bushing. Figure 11 Button 2 Figure 3 jtn, ) 0 Figure
Figure 4 (・ll (b) Figure 5 4 Figure 6 0 Figure Figure 7; i- 6 Figure 8 Figure 9 Figure 16I Figure 10 (a) (b) (c
) to

Claims (1)

[Claims] 1. A pipe-shaped rotating body that is fitted onto the rotating shaft, and a pipe that is tightly fitted into the gap between the rotating body and the rotating shaft at both ends of the rotating body in order to fix this rotating body to the rotating shaft at both ends. The fixture consists of an inner bushing and an outer bushing that are fitted into each other, each of the inner bushing and the outer bushing having a slot in the axial direction of the rotating shaft, and a contact surface of each of the inner bushing and the outer bushing. A rotating body shaft stopping device, characterized in that the tapered surfaces are formed in opposite directions at an angle of 7 degrees or less.