JPS6030859A - Rotary transmission system - Google Patents

Abstract

PURPOSE:To assure safety by providing a clutch between drive and inverted gears slidably and energizing to the drive gear side while providing projections on the facing faces of the drive gear and clutch and forming an inclined face on one of said projections. CONSTITUTION:A clutch 19 is provided slidably between a drive gear 18 and an inverted gear 20 while being energized to the drive gear 18 side through a resilient member 28. Then projections 21, 23 are provided on the facing faces of the clutch 19 and the drive gear 18 where an inclined face 22 for sliding the projection 23 is provided at the root of said projection 21. Consequently, during stoppage of motor, the clutch 19 is separated from the inverted gear 20 to prevent transmission of rotation from the side to be driven to the motor to assure safety.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotation transmission device in a small electric appliance such as a rotary cooker.

Conventional Structure and Problems Generally, this type of rotary cooker, for example, an orange squeezer, is equipped with a motor 2 in a main body 1 as shown in FIG. , 5, is transmitted to an output shaft 7 via a driven gear 6, and the output shaft 7 is configured to rotate a cone 8 provided at the upper part of the main body 1.

Note that 8' in the figure represents a container, and 9 represents a power plug.

Since this type of equipment is small, the drive source, motor 2, is a small permanent magnet rotor type synchronous motor, which has a simple structure, small size, and low cost, as shown in Figure 2. It has been adopted. This small permanent magnet rotor type synchronous motor consists of a stator 10, a drive coil 11 attached to the stator 10, and a permanent magnet rotor 13 rotatably provided at magnetic pole portions 12.12.

As is well known, in this small permanent magnet rotor type synchronous motor, the magnetic pole part 1 is
2.12 generates an alternating magnetic field and rotates the permanent magnet rotor 13 to obtain power, but if the permanent magnet rotor 13 is rotated with the power plug 9 removed from the power outlet etc., the generator functions as Therefore, for example, when the aforementioned cone 8 is turned by hand, this turns into the driven gear 6.
, intermediate gears 4, 5, and pinion 3 to rotate the permanent magnet rotor 13, and a high voltage is applied to the power plug 9 due to power generation.

Therefore, there is a problem in that when the power plug 9 is touched, the user receives an electric shock.

As a countermeasure against reverse rotation of the motor, the power supply side and drive coil 1
1 through a relay, or interposing a worm gear in a gear train. However, the former method via relays is expensive. On the other hand, in the latter method via Umem ELJIL, reversal cannot be completely prevented unless the winding angle of the worm gear is made close to about 40 inches.
Further, when such a worm gear is used, the gear transmission ratio is extremely deteriorated, which requires an increase in the motor capacity, and a problem arises in that it is no longer possible to provide a small and inexpensive product.

OBJECTS OF THE INVENTION The present invention takes into account the above-mentioned conventional problems, and aims to provide an inexpensive rotation transmission device with a simple structure for disabling the rotation of the motor due to the rotation of the fJX1+ side. .

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a drive gear, a clutch, and a driven gear coaxially so as to be freely rotatable, at least the driven gear maintains a fixed position, the clutch is slidable in the axial direction, and the driving gear Protrusions that are biased toward the side and engage with each other are provided on corresponding surfaces of the drive gear and the clutch, and a sloped surface for guiding a slide is formed at the base of one of the protrusions that engage with each other. The rotation transmission device is configured such that when the driving gear rotates, the corresponding protrusion slides on the inclined surface, that is, the clutch slides toward the driven gear, so that the clutch and the driven gear are coupled to each other. . According to this configuration, when the driving gear side, that is, the motor, is not rotating, the clutch is separated from the driven gear, and it is possible to prevent rotation from the driven gear side from being transmitted to the motor. There is no A-order due to power generation, and the rotation transmission system is configured only when the motor is driven, making it convenient to handle.Furthermore, the two-way switching is possible by devising the shape of the protrusions that engage with each other. This has the advantage of being automatic and having a simple structure.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 8.

In the figure, 14 is a gear pivot shaft, and the upper part has a stepped portion 15.
, and has a small diameter shaft 16. This gear pivot shaft 1
4 is held at both ends by bosses 17 and 17, and is rotatably supported by sequentially driving a drive wheel 18, a clutch 19, and a driven gear 20 at ωi from below. The drive gear 18 is a pinion (not shown) on the motor side.
The driven gear 2o meshes with a driven gear (not shown).

The driving gear 20 has a protrusion 21 on its upper surface, that is, the surface corresponding to the clutch 19, and this protrusion 21 has at its base a sloped surface 22 for sliding guide.

The clutch 19 is provided so as to be movable in the axial direction with respect to the gear pivot shaft 14, and has protrusions 23.2 on both surfaces, that is, the surfaces corresponding to the drive gear 18 and the driven gear 20, respectively.
It has 4. Furthermore, this clutch 19 is connected to the driven gear 2
It has an inclined surface 25 in the form of a flared hem on the outer periphery of the surface corresponding to o, and a plurality of protrusions 26 are provided protruding from the outer peripheral end of the inclined surface 26. The driven gear 2o is the small diameter shaft 1 of the gear pivot shaft 14.
6 and is supported by a stepped portion 15 to rotate in a fixed position, and has a protrusion 27 corresponding to the clutch 19. The tip of an elastic member 28, one end of which is fixed, is in contact with the surface 25 of the clutch 19, and the clutch 19 is
is biased toward the drive gear 18 side. When the motor is stopped (FIG. 3), the elastic part 28 biases the clutch 19's protrusion 24 to maintain the gap A with respect to the protrusion 27 of the driven gear 20. There is.

In the above configuration, when the motor is stopped, the third
The clutch 19 is in the state shown in the figure, that is, the clutch 19 is connected to the elastic member 2
8 and is disengaged from the upper driven gear 18. Therefore, even if the rotating member on the driven part side is rotated, the driven gear 18 idles and the rotation is not transmitted to the clutch 19, so the motor does not rotate and generate electricity, and the power plug that is unplugged from the power outlet does not rotate. It is safe because no voltage is applied. In this state, since the clutch 19 is moving downward, the tip of the elastic part 28 is between the plurality of protrusions 26 formed on the inclined surface 25 of the clutch 19, and the clutch 19 is in some way Even if a rotational force is received due to a cause, the rotation is prevented by the elastic portion 28.

Next, when the motor is rotated, the drive gear 18 rotates.

At this time, the protrusion 23 of the clutch 19, which is in contact with the upper surface of the drive gear 18 as shown in FIG. 7, rotates in the direction of the drive gear 180B as shown in FIG. In other words, the clutch 19 slides upward by a height D, and the protrusion 21
．． 23 is engaged. Due to the upward sliding of the clutch 19, the upper protrusion 25 of the clutch 19 becomes a protrusion of the driven gear 20 as shown in FIG. Engage with 7.

Therefore, the rotation of the motor is controlled by the drive gear 18 and the clutch 19.
, are transmitted to required driven parts via the slave shaft gear 2o.

Note that at this time, due to the upward movement of the clutch 19, the elastic member 2
8 is pushed up and escapes from between the protrusions 26 of the inclined surface 25 of the clutch 19, so the clutch 19 can rotate regardless of the elastic portion 28.

Effects of the Invention As is clear from the description of the embodiments described above, according to the present invention, when the motor is stopped, the clutch automatically cuts off the rotation transmission path, and even if the rotated part is manually operated, the motor does not rotate. No voltage is applied to the power plug due to power generation, ensuring safety. Further, when the motor is operating, the clutch is automatically switched to form a rotation transmission system, and manual operation is not required for the switching. Furthermore, since the clutch switching is performed on the inclined surface at the engagement part between the drive gear and the clutch protrusion, the structure is simple, and the disadvantages of using a relay or worm as described in the conventional example are eliminated. The effect is great.

In the above embodiment, the gear pivot shaft is provided with a stepped portion as a means for rotating the driven gear at a fixed position on the gear pivot shaft, but a stop ring may be attached to the gear pivot shaft. A driven 1v wheel may be received, so the positioning of the driven gear is not limited to the stepped portion. -1, the slope formed on the protrusion of the driving mountain,
Even if it is formed on the protrusion side of the clutch that corresponds to the kneading.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an orange squeezer with a conventional rotation transmission device, FIG. 2 is a plan view of the driving motor, and FIG. FIG. 4 is a sectional view of the main part of the rotation transmission device shown during rotation transmission, FIG. 6 is a perspective view of the main part of the clutch, and FIGS. 7 and 8 are sectional views showing the relationship between the clutch and the driving gear. 14...Gear pivot shaft, 18-Drive gear, 19-Clutch, 20-Driven gear, 21-Protrusion, 22-Slope, 23, 24-Protrusion, 28-Elastic member. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 6

Claims (1)

[Claims] A driving gear, a clutch, and a driven gear are sequentially arranged on a gear pivot shaft and are rotatably provided, and the clutch is slidable in the axial direction and biased toward the driven gear, and at least the driven gear is fixed. Protrusions that engage with each other are provided on the corresponding surfaces of the drive gear and the clutch, and protrusions are also provided on the corresponding surfaces of the clutch and the driven gear, respectively. A sloped surface for sliding guide is formed at the base of either the protrusion of the drive gear or the protrusion of the clutch, and when the drive gear rotates, the clutch is slid through the corresponding protrusion by the sloped surface, and the clutch and the driven A rotation transmission device configured to engage a protrusion of a gear.