JPH0126685B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric cooker mainly for cooking fruits, vegetables, etc.

Conventional technology Generally, electric cookers use a reduction gear to reduce the rotation speed of the motor. (For example, Juyusa rotates at about 5,000 revolutions.) However, if a reduction gear was used, the main body would be extremely large.

Therefore, the present inventors have considered an electric cooker in which the rotation speed of the motor is controlled by an electronic circuit, and the motor and cutter are directly connected without a speed reduction device.

Hereinafter, such an electric cooker will be described using a juicer as an example, with reference to the drawings.

In FIG. 5, a motor 2 whose rotational speed is controlled by an electronic circuit section 7 is provided at the inner bottom of the main body 1. A container 5 in which a spinner 6 is rotatably provided is placed on the top of the main body 1,
A drive shaft 3 of the motor 2 is connected to a spinner 6 via a coupling 4.

Problems to be Solved by the Invention However, according to the above-described configuration, if the electronic circuit section 7 malfunctions or breaks down for some reason, the motor 2 will be rotated at a speed that is not decelerated.
It rotates at a high speed of about 15,000 rpm, and the centrifugal force acting on the outer periphery of the cutter 6a and spinner 6 causes problems such as destruction of parts such as the container 5 covering the upper part of the main body or the container lid 8.

Therefore, the present invention is designed to cut off the current and prevent the motor from rotating at high speed when the above-mentioned abnormality occurs.

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems includes a motor that rotates the cutter by controlling the number of revolutions by a control unit, and a motor that rotates the cutter in a direction non-perpendicular to the drive shaft of the motor. a leaf spring fixed to the drive shaft; a blade portion provided on the leaf spring; and a blade portion of the leaf spring provided within a locus in which the blade portion of the leaf spring rotates when the rotation speed of the motor exceeds a controlled rotation speed. A supporting portion is provided which has a wire connected in series with the winding of the motor and comes into contact with the side surface of the leaf spring opposite to the wire.

Effects The effects of this technical means are as follows.

In other words, when the motor rotates normally and is normally controlled, the blades of the leaf spring will only slightly displace even when subjected to centrifugal force, but when the motor rotates at high speed, the blade of the leaf spring will displace centrifugally. As the force increases, it displaces greatly, reaches the position where the wire is stretched, and cuts it, cutting off the current. Also,
Since the support portion is in contact with the leaf spring, it is possible to prevent the leaf spring from swinging due to rotation/stopping of the motor.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings.

In FIGS. 1 to 4, an electronic circuit section 2 is placed inside a main body 10 on which a container 22 and a container lid 23 are placed.
A spinner 14 is fitted onto a drive shaft 12 of the motor 11 via a coupling ring 13.
A plate spring 1 is connected to the drive shaft 12 protruding from the frame 15 at the bottom of the motor 11 via an insulating plate 16.
7 is provided. This leaf spring 17 is curved in the opposite direction to the frame 15, and its tip is bent toward the frame 15 side to provide a blade portion 17a. Furthermore, a cooling fan 20 for the motor 11 fixed to the drive shaft 12 is provided in contact with the lower surface of the leaf spring 17, and applies a force to prevent the leaf spring 17 from swinging in the bending direction more than necessary. This is to prevent repeated bending stress from being applied to the attachment portion of the plate spring 17, which would lead to fatigue failure when the motor 11 repeatedly rotates and stops. Further, a non-conducting wire mounting plate 18 is installed on the lower surface of the frame 15 near the blade portion 17a of the leaf spring 17, and a wire 19 that is electrically connected to the windings of the motor 11 is stretched on this plate. There is.

Next, the operation of the above configuration will be explained. When the motor 11 rotates, the drive shaft 12 rotates, the spinner 14 and the cutter provided at the bottom of the spinner 14 rotate, and the fruits and vegetables in the container 22 and container lid 23 are cut. At this time, the blade portion 1 of the leaf spring 17
7a receives centrifugal force and is displaced toward the frame 15. First, when the motor is rotating normally, there is only a small displacement and the wire 19 does not reach the tensioned position.

Next, when the electronic circuit section 21 etc. that controls the rotation speed malfunctions or breaks down, the motor 11 rotates at high speed and is in a dangerous state, but the centrifugal force applied to the leaf spring 17 increases, causing the leaf spring 17 to The curve approaches a horizontal shape, and the blade portion 17a cuts the wire 19. Therefore, the current flowing through the motor is cut off, and dangerous high-speed rotation can be prevented.

Also, depending on whether the motor 11 is turned on or off, the leaf spring 1
7 tries to swing due to the shock, but it does not swing because it is in contact with the cooling fan 20 of the motor 11, and fatigue failure of the leaf spring 17 can be easily prevented by using the cooling fan 20 of the motor 11. can do.

In addition, although the cooling fan 20 of the motor 11 was used in the above embodiment, it goes without saying that a support part may be provided separately.

Effects of the Invention As is clear from the description of the above embodiments, the present invention fixes a leaf spring to the drive shaft of a motor, and utilizes the deformation of the leaf spring due to centrifugal force during abnormally high speed rotation to tighten the motor windings. The conductive wire is cut by the blade provided on the leaf spring, and when the motor rotates at abnormally high speeds, the current can be cut off, thereby preventing dangerous situations such as destruction of parts during high-speed rotations. Moreover, the fatigue phenomenon exerted on the leaf spring mounting portion due to rotation and stoppage of the motor is also prevented by bringing the support portion into contact with the leaf spring.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the main parts of an electric cooking device according to an embodiment of the present invention, Fig. 2 is a plan view of the same, and Fig. 3 is an enlarged cross-sectional view of the main parts showing the movement of the leaf spring of the electric cooking device. ,
FIG. 4 is a longitudinal sectional view of the electric cooking appliance, and FIG. 5 is a longitudinal sectional view of a conventional juicer. DESCRIPTION OF SYMBOLS 11... Motor, 12... Drive shaft, 17... Leaf spring, 17a... Blade part, 19... Wire, 20
...Cooling fan.

Claims (1)

[Claims] 1. A motor that rotates the cutter with its rotation speed controlled by a control unit, a leaf spring fixed to the drive shaft in a direction non-perpendicular to the drive shaft of the motor, a blade provided on the leaf spring, and the motor. a wire provided within the rotation trajectory of the blade portion of the leaf spring and connected in series with the winding of the motor, the wire being connected to the opposite side of the leaf spring from the wire when the rotation speed exceeds a certain number of revolutions. An electric cooker equipped with a supporting part that comes into contact with it.