JPH0127416Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic reversing motor that automatically reverses the rotation of the motor by using an AC motor whose rotor rotates either left or right at startup.

2. Description of the Related Art Conventionally, an AC motor is known that incorporates a blocking member that restricts the rotation of an AC motor in one direction, in which the rotor rotates in either the left or right direction when the rotor is started. However, as the market needs of products have diversified in recent years, products that are not satisfied with only one-way rotation have appeared, and when using an inductor motor with high torque, the motor should rotate in one direction and a separate switching mechanism is required. It has been used to support left and right rotation. As a result, the device became complicated and uneconomical, and there were many problems in terms of quality, torque loss, compactness, etc.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to propose an automatic reversing motor that alternately and automatically reverses rotation by using the rotation of an AC motor that rotates either left or right at startup.

The feature of the present invention is that a rotor that rotates to the left or right during startup is provided with a contact part that acts in each direction of rotation, and that the rotor moves in and out of the rotation range of the contact part to restrict the rotation direction of the rotor to one direction. The blocking member is controlled by a reversing cam attached to the output shaft of the AC motor.

The present invention will be explained below with reference to illustrated embodiments. The automatic reversing motor is composed of an AC motor 1, a reversing cam 7 as a reversing member, an uneven cam part 8, and a leaf spring 20. In FIG.
A shading plate 10 and a coil bobbin 11 on which an excitation coil is wound are dropped into the case, a cup-shaped case 3 having a smaller diameter than the cup-shaped case 2 is stacked above the cup-shaped case 2, and a lid 12 is attached to the upper opening of the cup-shaped case 3. Fixed.

A plurality of yokes 2a are cut upward at the bottom of the cup-shaped case 2, and a bobbin 11 is formed.
A flanged bearing part 13 is fixed to the center of the bottom, and the lower end of a shaft 14 is fixed to the center of the flanged bearing part 13. The lower end surface of the shaft cylinder 4a of the rotor 4 is mounted on the flange of the portion 13.

A plurality of yokes 3a are cut downward at the bottom of the cup-shaped case 3 and are arranged along the inner peripheral surface of the coil bobbin 11 so as to intertwine alternately with the yokes 2a. A large-diameter through hole 3b is bored, a bearing portion 15 is fixed to the outside of the hole 3b, and an output shaft 17 is supported by a bearing portion 16 fixed to the lid 12. Further, on the outside of the through hole 3b, a plurality of through holes are bored into which the shaft 18 of the gear 5 and the shaft portion of a gear train (not shown) are fitted.

The lid 12 has a shaft 18 of the gear 5, a shaft hole of another gear train (not shown), a fixed through hole of the bearing part 19 of the rotation regulating body 6, a bearing part 16 of the output shaft 17, and a shaft of the shaft 14. A hole is drilled in each case.

The output shaft 17 of the AC motor 1 is shown in FIG.
As shown in FIG. 6, the reversing cam 7 and the uneven cam part 8 are fixed to the rotation regulating body 6, and the plate spring 20 is brought into contact with the uneven cam part 8, so that the reversing cam 7 and the uneven cam part 8 are fixed to each other.
and the leaf spring 20 constitute a reversing member.

The rotor 4 is composed of a shaft cylinder 4a and a magnet 21, and a perpendicular cam 4d is formed on the upper side of the shaft cylinder 4a, as shown in FIG. Aperture parts 4e and 4f are formed on the left and right sides of 4c, and a pinion 4g is formed at the upper end, with which the gear 5 is meshed.

A pinion 5a is integrally formed on the gear 5, and a collar 22, a blocking member 9, and a friction plate 23 are fitted to the lower shaft 18 of the gear 5, and the pinion 5a is fitted into the shaft cylinder 5b at the upper end of the pinion 5a. The blocking member 9 is rotated in the same direction as the rotational direction of the gear 5 by being pushed down by the disc spring 24 . A gear train (not shown) is meshed between the pinion 5a and the gear 25 fixed to the output shaft 17.

The shaft portion 6a of the rotation regulating body 6 is rotatably supported on a bearing portion 19 with a disc spring 26 to prevent it from coming off, and the uneven cam portion 8 of the reversing member is fixed to the upper side. In FIG. 1 of the rotation regulating body 6, there is an eccentric pin 6b on the lower side.
protrudes and is interposed between the bifurcated legs 9a and 9b of the blocking member 9, as shown in FIGS. 2 to 5.

The reversing cam 7 of the reversing member is formed into a fan shape with an angle α, and has protrusions 7b and 7c formed with steps at both ends of the outer periphery 7a. Further, the uneven cam portion 8 is provided with a step on the upper and lower sides of the circular 8a, and protrusions 8b and 8c are formed, respectively. Further, as shown in FIG. 1, there is a circular shape 8a with an outer circumferential diameter on the lower side of the protrusion 8c, and at an intermediate position between the protrusions 8b and 8c as shown in FIGS. 6 to 9. The same convex portion 8d is formed. Furthermore, the tip of the leaf spring 20 is bent into a dogleg shape, and the other end is fixed to the lid 12.

The eccentric pin 6b is arranged below the convex portion 8d.

The blocking member 9 is formed into a deformed H-shape as shown in FIG. A large semicircle 4b of the cam 4d is formed of a rotatable circular arc surface 9c, and blocking portions 9d and 9e are formed at both ends thereof, respectively.

The shading plate 10 is made of copper material and the flange bearing portion 13
A through hole into which the yoke 2a is inserted is bored.

The automatic reversing motor is configured as described above, and includes the contact parts 4e, 4f, the blocking member 9, and the rotation regulating body 6.
The automatic reversal operation of the rotational direction of the rotor 4 by the reversing cam 7 and the uneven cam portion 8 of the reversing member is observed from the bottom of FIG. Referring to FIGS. 6 to 9, the eccentric pin 6b of the rotation regulating body 6 is located on the right side as shown in FIG.
As shown in the figure, the AC motor 1 is energized and the rotor 4 is started and rotated in the clockwise direction when viewed from the top of FIG. 1.
To explain the operation in FIG. 3, in FIG. 2, the percussion cam 4d is rotated counterclockwise, the gear 5 is rotated clockwise via the pinion 4g of the rotor 4, and the blocking member 9 is rotated clockwise. The leg portion 9b of the blocking member is brought into contact with the eccentric pin 6b, and the clockwise rotation of the blocking member 9 is blocked, but the blocking portion 9d does not enter the rotation range of the percussion portion 4c of the percussion cam 4d. The rotor 4 continues to rotate.

In the above state, when the motor is started, rotor 4
When the engine is started and rotated in the opposite direction to that shown in FIG. 2, the rotation cam 4d in FIG. 3 is rotated clockwise, the gear 5 is rotated counterclockwise, and the blocking member 9 is rotated counterclockwise. The leg portion 9a is moved to the eccentric pin 6b.
When the blocking part 9e comes into contact with the rotation area of the contact part 4f of the contact cam 4d, the rotation of the rotor 4 is stopped, and the rotor 4 rotates clockwise with the phase of the next alternating current flowing through the excitation coil. Then, the percussion cam 4d is rotated counterclockwise and the blocking member 9 is rotated clockwise, so that the blocking portion 9e of the blocking member 9 comes out of the rotation range of the percussion portion 4f, and the percussion cam 4d is rotated counterclockwise and the blocking member 9 is rotated clockwise. The cam 4d is rotated counterclockwise and continues to rotate.

The output shaft 17 is configured to rotate counterclockwise in FIGS. 6 to 9 when the rotor 4 rotates clockwise when viewed from above in FIG. 1. Therefore, as the rotor 4 continues to rotate in the clockwise direction, the reversing cam 7 is rotated counterclockwise in FIG. When the angle is rotated, the state shown in FIG. 9 is reached, and the projection 8b is pushed by the projection 7b against the biasing force of the leaf spring 20 in contact with the projection 8d, and the state is changed to the state shown in FIG. 6. Ru.

With this conversion, the eccentric pin 6b is rotated to the left position as shown in FIGS. 4 and 5, and the protrusion 7c is
Before contacting, the state shown in Fig. 5 is reached, and
It is reversed by rotor 4 and begins to rotate counterclockwise.
Then, as shown in FIG. 4, the percussion cam 4d rotates clockwise, and the gear 5 and the blocking member 9 rotate and rotate counterclockwise, but the leg 9a comes into contact with the eccentric pin 6b. , the blocking portion 9c cannot enter the rotation range of the perpendicular portion 4f. As a result, the rotor continues to rotate.

When the rotor 4 is started up, if it is rotated clockwise when viewed from the top of FIG. 1, the rotation cam 4d is rotated counterclockwise in FIG. 5, and the gear 5 and the blocking member 9 are rotated clockwise. - Rotated, leg 9b
is brought into contact with the eccentric pin 6b, so the blocking part 9d is brought into contact with the contact part 4e, stopping the rotation of the rotor 4, and the rotor 4 rotates counterclockwise with the phase of the next alternating current flowing through the exciting coil. Then, as shown in FIG. 4, the percussion cam 4d is rotated clockwise and the blocking member 9 is rotated counterclockwise, so that the rotor 4 continues to rotate.

When the rotor 4 is rotated counterclockwise as described above, the reversing cam 7 is reversely rotated clockwise from the state shown in FIG. The protruding portion 7c approaches the protruding portion 8c as it is rotated, and pushes the protruding portion 8c as shown in FIG. 7, resulting in the state shown in FIG.
3, the rotation of the rotor 4 is reversed clockwise and the rotation of the reversing cam 7 is reversed counterclockwise before the protrusion 7b approaches the protrusion 8b.
By repeating the above, the left and right rotations continue to be alternately reversed.

The angle α of the reversing cam is set depending on the purpose of use of the external device to which the automatic reversing motor is attached, and the angle may be arbitrarily adjustable.

Figures 10 to 12 show modified examples of the reversing member,
The reversing cam 7 is rotatably fitted to the output shaft 17,
A gear 27 that is long in the axial direction is fixed to the rotation regulating body 6 . The reversing cam 7 has a gear 7d and a cam cylinder 7c.
are integrally formed, and a stepped portion 7 is formed on the end surface of the cam cylinder 7c.
Cams having different lengths in the outer circumferential direction are formed by f, 7g, 7h, 7i, 7j, and 7k, and the pin 28 fixed to the output shaft 17 faces, and the reversing cam 7 is configured to be slidable in the axial direction. ing.

The operation of the modified example is that when the output shaft 17 rotates and the pin 28 comes into contact with the stepped portion 7f and rotates, the gear 7
d, the eccentric pin 6b of the rotation regulating body 6 is moved from the A position to the B position as shown in FIG.
Next, when the pin 28 comes into contact with the stepped portion 7g, the eccentric pin 6b is moved from the A position to the A position, and the rotation direction is controlled as shown in FIGS. 2 to 5.

In the above description, the reversing member is provided on the external output shaft 17 of the AC motor 1, but it may also be provided inside the case 3.

As mentioned above, the present invention has a reversing cam that is attached to the output shaft of the AC motor, and a blocking member that restricts the rotor's rotational direction in one direction by entering and leaving the rotation range of the rotor provided on the rotor of the AC motor. By alternating the rotational direction of the rotor, the reversing cam, which has a large torque, is used to rotate the blocking member, which rotates with a smaller torque than the reversing cam, so a small force is required. Since the rotation of the AC motor can be alternately and automatically reversed, the load during collision is small and can be reversed without using unnecessary force, resulting in less torque loss.Furthermore, since reversal can be performed with a small force, reversal can be performed reliably. It is also highly reliable.

In addition, since the rotation direction of the rotor is switched by a reversing cam mounted on the motor, it can be miniaturized, and the structure of the external device is also simple because the motor has a built-in blocking member that restricts the rotation direction of the rotor to one direction. It is possible to provide an automatic reversing motor that has excellent practical effects such as becoming easier to handle.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional side view of an automatic reversing motor, FIGS. 2 to 9 are explanatory views of the operation, and FIGS.
When viewed from the top of the figure, the clockwise rotation is switched, and FIG. 2 is an explanatory diagram in which the degree cam is rotated in the set rotation direction, and FIG. 3 is an explanatory diagram in which the degree cam is rotated in the counter-set rotation direction. Figures 4 and 5 are explanatory diagrams in which the rotor is switched to rotate counterclockwise when viewed from the top of Figure 1, and the degree cam is rotated in the set rotation direction, and Figure 5 is an illustration of the degree cam rotated in the set rotation direction. 6 to 9 are explanatory diagrams of the operation of the reversing member, and FIG. 6 is an explanatory diagram of the operation of the reversing member in which the rotor is set to rotate in a counterclockwise direction. FIG. 7 is an explanatory diagram of the intermediate operation set in the same clockwise direction, FIG. 8 is an explanatory diagram of the intermediate operation set in the same clockwise direction, FIG. 9 is an explanatory diagram of the intermediate operation set in the same counterclockwise direction, and FIG. 12 are explanatory views of modified examples of the reversing member, FIG. 10 is a side view, FIG. 11 is a front view, and FIG. 12 is an operation explanatory view. 1... AC motor, 4... Rotor, 7, 8
...Reversing member, 7... Reversing cam, 8... Uneven cam portion, 9... Blocking member.

Claims (1)

[Scope of utility model registration request] In an AC motor in which a rotor rotates in either the left or right direction at startup, the rotor includes a contact portion provided on the rotor, a blocking member that moves in and out of the rotation range of the contact portion and restricts the rotational direction of the rotor to one direction; a rotation regulating body that contacts the blocking member and restricts the rotation of the blocking member; and a rotation regulating body that is attached to the output shaft of the motor and rotates in conjunction with the rotor, and also contacts the rotation regulating body and rotates the rotation regulating body. a reversing cam that alternately switches the rotational direction of the rotor by moving the rotor, and the reversing cam alternately switches the rotational direction of the rotor, so that the blocking member changes the rotational direction of the rotor via the rotation regulating body. An automatic reversing motor that is regulated in one direction and alternately repeats rotation of the rotor and reversing cam.