JPH0587151A - Taper shaft connecting device - Google Patents

Abstract

PURPOSE:To provide a taper shaft connecting device capable of performing the fastening and detachment of taper shafts by one screw and enlarging the effective use area of a circuit substrate fittingly stored inside a rotary encoder at the time of being applied to the rotary encoder. CONSTITUTION:In a taper shaft connecting device for removably connecting two shafts with tapered parts formed so that the inner periphery of one shaft is fitted to the outer periphery of the other shaft, the fastening/detachment of two shafts 1, 8 is performed by one screw 14 formed into the same diameter along the whole length including the opposed part to each shaft but into the mutually different form at the opposed part to each shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a taper shaft coupling device, and more particularly to a simple attachment / detachment between taper shafts.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a main part of a rotary encoder in which a conventional taper shaft coupling device is used. The rotary encoder is composed of an encoder unit A and a rotation speed detecting unit B. 1 is a shaft,
A tapered recess is provided on the inner circumference, and the bearing 2 is provided on the outer circumference.
Is fitted. 3 is a light emitting diode (LED), 4
Is a code plate, 5 is a photodiode array (PDA), and the LED 3 and the PDA 5 are arranged so as to face each other so as to sandwich the code plate 4 and form an angle detection unit. Reference numeral 6 denotes a rotating magnet, which is connected to the shaft 1. A magnetic bubble unit 7 detects the rotation of the rotary magnet 6 based on the movement of the magnetic bubble composed of a plurality of bit patterns.

FIG. 5 is a block diagram of the above angle detector. The code plate 4 is provided with three concentric slit rows a, b, and c having different radii, and if the number of slits of the slit row a having the largest radius is, for example, n, the slit row b of the middle radius is The number of slits is set to (n−m), and the number of slits in the slit row c having the smallest radius is (n−m−).
1), where n and m have a relationship of n = km, and k, n, and m are natural numbers.

The two LEDs 31, 32 are arranged at positions symmetrical with respect to the rotation axis and illuminate the code plate 4. The PDA is physically arranged in two, 51 and 52. One is a combination of PDA 51a, 51b, 51c, which receives light from LED 31. The other is a combination of PDA's 52a, 52b, 52c, which receives light from LED 32. Here, the PDAs 51a and 52a detect two light intensity distributions generated on the back side of the slit array a having the maximum radius, and the PDAs 51b and 52b generate two light intensity distributions generated on the back side of the slit array b having the next largest radius. The PDAs 51c and 52c detect two light intensity distributions generated on the back side of the slit array c having the minimum radius. Each of these PDA's 51a to 52c is composed of four photoelectric conversion elements that divide one cycle of the light intensity distribution into four equal parts.

When the code plate 4 shown in FIG. 5 is rotated once, n slits are provided in the slit row a.
The A51a and 52a detect a sine wave having an n cycle, and the slit array b is provided with (n-m) slits. Therefore, the PDA 51b and 52b detect a sine wave having an (nm) cycle. , (N−m−1) slits are provided in the slit row c, so that a sine wave having a (n−m−1) period is detected by the PDA 51b and 52b.

As a result, 360 ° is divided into n equal parts by the slit array a having the maximum radius, and the inside of 360 / n (for example, n
= 180, 2 °) can be measured with extremely high resolution, and it is possible to specify which position in 360 ° the 2 ° corresponds to with the other slit rows b and c, and the absolute angle of the code plate 4 can be specified. θ can be measured.

By the way, FIG. 6 is a configuration diagram of a main part of a conventional taper shaft coupling device in such a rotary encoder. FIG. 6A shows a state before fastening,
(B) shows the detached state. In the figure, reference numeral 8 is a shaft of a motor, and a taper that fits the taper of the inner circumference of the shaft 1 of the rotary encoder is formed at the end portion thereof. A screw hole 10 into which a screw 9 used at the time of fastening is screwed is formed at the end of the shaft 8, and the shaft 1
A screw hole 12 into which a screw 11 used at the time of detachment is screwed is formed at the end of the. Here, the diameter of the screw hole 10 is φ
a, the diameter of the screw hole 12 is φb, and the diameters of the heads of the screws 9 and 11 are φc, these are set to φa <φb <φc.

In such a structure, the shafts 1 and 8
To fasten, screw 9 into screw hole 10 of shaft 8.
Tighten by screwing. As a result, the tapered surfaces of both are firmly fitted in a wedge shape.

On the other hand, in detaching the fastened shafts 1 and 8, it is difficult to separate them by only loosening the screw 9, and instead of the screw 9, the screw 11 is screwed into the shaft 8 so that the shaft 1 can be removed. Push out from the taper.

[0010]

However, in such a conventional taper shaft coupling device, there are two parts, one for fastening and one for releasing.
The screws 9 and 11 are required, and the man-hours for attaching and detaching these screws are required.

Further, as shown in FIG. 7, a hole having a diameter sufficient to allow the heads of the screws 9 and 11 to pass through must be provided in the central portion of the circuit board 13 housed and mounted in the rotary encoder. In addition, the effective use area of the circuit board 13 is reduced accordingly.

The present invention has been made in view of the above problems, and an object thereof is to fasten and unfasten a taper shaft with a single screw, and when applied to a rotary encoder, the inside of the rotary encoder. An object of the present invention is to provide a taper shaft coupling device capable of widening an effective use area of a circuit board housed in and mounted on the tape shaft.

[0013]

In a taper shaft coupling device according to the present invention, a taper is formed so that the inner circumference of one shaft and the outer circumference of the other shaft are fitted to each other.
In a taper shaft coupling device for detachably coupling two shafts, fastening and disengaging of the two shafts are formed to have the same diameter over the entire length including a portion facing each shaft, and a portion facing each shaft is formed. It is characterized in that it is performed with a single screw formed in a different form.

[0014]

By rotating the screw in one direction, the two tapered shafts are fastened, and by rotating the screw in the other direction, the two tapered shafts fastened are disengaged.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of the present invention, (A) shows a state before fastening two shafts,
(B) shows the detached state. In the figure, 14 is 2
A screw for fastening and unfastening the shafts 1 and 8 of the book. The screw 14 is formed to have the same diameter over the entire length including the portion facing the shafts 1 and 8. A portion 14a of the screw 14 opposed to the shaft 1 is formed as, for example, a left screw that is tightened when rotated counterclockwise, and an opposite portion 14b of the screw 14 is formed as a right screw that is tightened when rotated in a clockwise direction, for example. Has been formed. A fitting hole 14c into which the hexagon wrench 15 is fitted is formed on the end surface of the screw 14.

As a result, the two shafts 1 and 8 are pulled together and fastened by rotating the screw 14 clockwise as shown in FIG.
By rotating 4 in the counterclockwise direction, the two shafts 1 and 8 are separated from each other. That is, the two shafts 1 and 8 can be fastened and unfastened by changing the rotation direction of the single screw 14.

When such a configuration is applied to the rotary encoder described above, the hole provided in the central portion of the circuit board 13 housed and mounted in the rotary encoder only needs to allow the hexagon wrench 15 having a diameter φd to pass through, and a screw 1
4 can be made smaller than the outer diameter φa of the circuit board 13
The effective use area of can be increased.

FIG. 2 is a block diagram showing another embodiment of the present invention. In the figure, 16 is a screw for engaging and disengaging the two shafts 1 and 8. The screw 16 is for each shaft 1,
8 is formed to have the same diameter over the entire length including the facing portion, and the facing portion 16a of the screw 16 facing the shaft 1 is formed as, for example, a fine screw, and the facing portion 1 facing the shaft 8 is formed.
6b is formed as a coarse screw having a pitch larger than that of the fine screw, for example. Further, a fitting hole 16c into which the hexagon wrench 15 is fitted is formed on the end surface of the screw 16. Note that these screws are right-handed only because they have different pitches.

As a result, by rotating the screw 16 in the clockwise direction, the two shafts 1 and 8 are attracted to each other and fastened according to the pitch difference per rotation, and the screw 16 is rotated in the counterclockwise direction. Thus, the two shafts 1 and 8 are pulled apart from each other and separated. That is, similar to FIG. 1, the two shafts 1 and 8 can be fastened and unfastened by changing the rotation direction of the single screw 16.

Also, when such a configuration is applied to the rotary encoder described above, a hole provided in the central portion of the circuit board 13 housed and mounted in the rotary encoder is a hexagon wrench 15 having a diameter φd as in FIG. It suffices that the screw 16 pass through, and the outer diameter φa of the screw 16 can be made smaller, so that the effective use area of the circuit board 13 can be increased.

FIG. 3 is a constitutional view showing still another embodiment of the present invention, where (A) shows the state before the two shafts are fastened, (B) shows the fastened state, and (C) shows the state. The state before separation is shown, and (D) shows the separation state. In the figure, 1
Reference numeral 7 is a screw for fastening and disconnecting the two shafts 1 and 8. The screw 17 is also formed to have the same diameter over the entire length including the portion facing the shafts 1 and 8, and the taper end surface of the shaft 1 without forming a screw on the portion 17a facing the shaft 1 of the screw 17. A strong collar 18 that functions as a stopper is attached thereto, and a right-hand thread is formed at a portion 17b facing the shaft 8, for example. Also,
A fitting hole into which a hexagon wrench is fitted is formed on the end surface of the screw 16, but it is not shown.

In such a structure, by rotating the screw 17 in the clockwise direction, the two shafts 1 and 8 are attracted to each other and fastened as shown in FIGS. Then, when the screw 17 is rotated counterclockwise, the screw 17 starts to come out of the shaft 8 and the flange 18 contacts the tapered end surface of the shaft 1 as shown in (C).
When the screw 17 is further rotated in the clockwise direction from the state of (C), one end of the screw 17 is fixed by the collar 18, so that it is converted into a force for pushing the shaft 8 as shown in (D) and the two shafts 1 , 8 taper fitting is released. That is, similarly to FIG. 1, the two shafts 1 and 8 can be fastened and unfastened by changing the rotation direction of the single screw 17.

Even when this structure is applied to the rotary encoder described above, a hexagon wrench passes through the hole provided in the central portion of the circuit board 13 housed and mounted in the rotary encoder as in FIGS. 1 and 2. The outer diameter of the screw 17 can be made smaller, so that the effective use area of the circuit board 13 can be increased.

Although each of the above-described embodiments has been described as an example applied to a rotary encoder, it can also be applied to the connection of tapered shafts of various mechanisms.

[0025]

The taper shaft coupling device according to the present invention described in detail above has the following effects.

Since the taper shaft can be fastened and unfastened with a single screw, workability is greatly improved. By applying this to a rotary encoder, the diameter of the hole required in the central portion can be made smaller than in the conventional case, so that the effective area for mounting components of the circuit board accommodated and mounted inside can be increased.

Specifically, when M4 is used as the screw, the conventional configuration requires a hole of φ7 mm corresponding to the diameter φc of the head of the M4 hexagon socket head bolt at a minimum. A hole of φ2.3 mm, which corresponds to the outer diameter φd of the hexagon wrench that fits in the hole of the head of the set screw,
It was able to be less than 1/3.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of another embodiment of the present invention.

FIG. 3 is a configuration diagram of still another embodiment of the present invention.

FIG. 4 is a configuration diagram of a main part of a rotary encoder in which a conventional taper shaft coupling device is used.

5 is a configuration diagram of an angle detector of FIG.

FIG. 6 is a configuration diagram of a conventional taper shaft coupling device.

FIG. 7 is a cross-sectional view with a part of FIG. 4 omitted.

[Explanation of symbols]

 1 Shaft (Rotary Encoder) 8 Shaft (Motor) 14, 16, 17 Screw 15 Hex Wrench

Claims (1)

[Claims] 1. A taper shaft coupling device for detachably coupling two shafts, each of which has a taper formed so as to be fitted to the inner circumference of one shaft and the outer circumference of the other shaft, wherein the two shafts are provided. The taper shaft is characterized in that the fastening and the disengagement are performed by a single screw formed to have the same diameter over the entire length including the facing portion with each shaft and the facing portion with each shaft having a different shape from each other. Coupling device.