JPS6043131B2 - electric cooker - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electric cooker that obtains high-speed rotation function and low-speed rotation function by switching between forward and reverse rotation of the electric motor, and its purpose is to prevent sudden reversal of the electric motor. .

An embodiment of the present invention will be described below based on the drawings.

1 is an electric motor, 2 is a small pulley fixed to the shaft of electric motor 1,
4 is a large pulley, which is connected to the small pulley 2 by a belt 3.

Further, the large pulley 4 is connected to a driven shaft 5, which is rotatably held by an axle stand 17, and a reduction gear is housed in the driven shaft 5 via a one-way clutch 6. It holds the reducer case 8 and is connected to the sun gear 7 of the reduction gear at its tip. Reference numeral 10 denotes an output shaft, which is rotatably held in the reducer case 8 and whose lower end is connected to a planetary gear of the reduction gear so that deceleration power can be taken out.

A lower connector 11 is fixed to the upper end of the output shaft, and is removably fitted to an upper connector 12 fixed to the lower end of the main shaft 13 of the container 9.

That is, the container 9 is detachably attached to the main body 15, and the main shaft 13 of the container 9 obtains rotational force from the main body 15 by fitting the lower connector 11 and the upper connector 12.
Although not shown, a cooking attachment is fitted to the main shaft 13. 14 is a lid that covers the upper opening of the container 9.

2 is a plan view of FIG. 1, 16 is a rotary type changeover switch for switching between high speed rotation and low speed rotation, 19 is a power switch, and 18 is a base on which the electric motor 1, reducer, etc. are held. Reference numeral 20 denotes a fixing device for fixing the reducer case 8 that houses the reduction gear, and this fixing device is provided with a contact piece 21 along the outer circumference of the reducer case 8, and the reducer case rotating torque of the abutting piece 21 is fixed. An operating piece 22 is provided that is bent outward in the direction of the arrow C (details will be given later), and the abutting piece 21 side of the operating piece 22 is pivoted to support the abutting piece against the reducer case 8. 21 is rotatable so that it can come into contact with and separate from it, and the contact and separation are performed by a cam 23 that is interlocked with the changeover switch that is in contact with the end of the operating piece 22.

24 is an elastic member such as a comb attached to the surface of the abutting piece 21, and 25 is a spring that always urges the abutting piece 21 toward the reducer case 8 side so that it follows the operation of the cam 23. It's summery.

Next, the operation of the above configuration will be explained.

First, in order to obtain the high-speed rotation function, when the selector switch 16 is set to high speed, the cam 23 causes the reducer fixing device 20 to
comes into contact with and separates from the reducer case, and the power switch 1
9, the electric motor 1 rotates in the D direction (forward rotation direction). The rotation is transmitted to the driven shaft 5 via the small pulley 2, belt 3, and large pulley 4, but the reducer case 8 in which the reduction gear is housed and fixed is separated from the reducer fixing device as described above, and rotates. A one-way rotational clutch 6 is interposed between the reducer case 8 and the driven shaft 5, and the clutch 6 is in the locking direction during forward rotation, so that the rotation of the driven shaft 5 is free. Light reducer case 8
is rotated in direction B and is transmitted to the output shaft 10, lower connector 11, upper connector 12, and main shaft 13 without being decelerated. Next, in order to obtain the low speed rotation function, when the selector switch 16 is set to low speed, the cam 23 causes the reduction gear fixing device 2 to rotate.
0 comes into contact with the reducer case 8, and by turning on the power switch 19, the electric motor 1 rotates in the E direction (reverse rotation direction). Its rotation is caused by small pulley 2 and belt 3.
, is transmitted to the driven shaft 5 via the large pulley 4, the reducer case 8 is in contact with the reducer fixing device 20 and is in a fixed state, and there is a gap between the reducer case 8 and the driven shaft 5. Intervening unidirectional gyrus. In reverse rotation, the rotating clutch 6 moves in the releasing direction (
A direction), the rotation of the driven shaft 5 is reduced in speed and transmitted to the output shaft 10 via a reduction gear made up of a sun gear 7 and a planetary gear, and is further transmitted to the lower connector 11 and the upper connector 12.
, is transmitted to the main shaft 13. As in the above configuration, a high-speed rotation function and a low-speed rotation machine can be achieved by rotating the electric motor 1 in the forward and reverse directions.However, the problem here is that if the changeover switch 16 is changed during operation, a sudden reversal of the electric motor causes a large start. The problem is that current is generated and a large arc is generated between the rotor and the brushes, shortening the life of the comb motor 1.This problem can be solved by creating a configuration in which the power switch 19 is turned off by operating the changeover switch 16. I was able to resolve it.

Details will be explained below based on FIGS. 3 and 4. 16
is a rotary type changeover switch that opens and closes a contact 28 using a cam 27.

A ball 29 is interposed between the cam 27'' and the leaf spring 30, and serves to provide a good feel during switching.

31 is a U-shaped holding fitting that holds the leaf spring 30;
An enlarged plate 33 is pivotally supported on the projecting piece 32 of the holding fitting, and the enlarged plate 33 is movable along the end face of the holding fitting 31.

Also, one end contacts the leaf spring 30, and the other end slides on the base 35 surface and contacts the movable plate 34, so that the amount of change in the leaf spring 30 caused by the cam 27'' is magnified and transmitted to the movable plate 34. The movable plate 34 is pivotally supported on the base 35 of the changeover switch 26 in a pendulum shape and movable on the base surface, and the pivot is far away from the movable piece 3C so that the amount of change in the lateral direction is large. The movable plate 34
The amount of change transmitted to the operation button 37 and the operation button 3
7 to close the contacts, and a holding plate 39 that holds the operating plate 38 with the contacts closed. do. In the above configuration, the retaining plate 39 is
Although the cam 27'' is operated in this example, it is also possible to operate the cam 27'' directly.

As described above, according to the present invention, the power switch is turned off in conjunction with the changeover switch that changes the rotational direction of the electric motor, so even if you try to change the rotational direction by operating the changeover switch during operation, the power switch will not turn off. This eliminates the disadvantages of generating a large starting current due to sudden reversal of the motor and shortening the life of the motor due to arcing between the rotor and the brushes.

Furthermore, since the holding plate is moved by magnifying the amount of change in the cam using the magnifying plate, the operation is reliable and highly reliable.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of an electric cooker according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of Fig. 1, Fig. 3 is an enlarged view of main parts, and Fig. 4 is a direction A in Fig. 3. It is an arrow view. 1... Electric motor, 16... Selector switch, 19...
Power switch, 33... Magnifying board, 34... Movable board.

Claims (1)

[Claims] 1. An electric motor capable of forward and reverse rotation, a main shaft to which the power of the electric motor is transmitted and drives a cooking attachment, a changeover switch for switching the rotational direction of the electric motor, and a power switch, the power switch having an operation button and an operation button. It consists of an operating plate that is linked to the button and closes the contacts, and a holding plate that holds the operating plate with the contacts closed. An electric cooking appliance characterized in that a movable plate is provided, and when a changeover switch is operated, the movable plate moves a holding plate of a power switch to release the holding plate of the operating plate and open a contact.