JPS6041940B2 - Electric cooking machine switch device - Google Patents

Description

Detailed Description of the Invention The present invention relates to a switch device for controlling the stop, start, etc. of the electric motor in an electric cooking machine such as a hand mixer. This allows reliable speed control even if foreign matter gets mixed in.

Conventional switch devices of this type have several lead wires with different electrical resistances wired inside the main body from the motor, each lead wire connected to the switch section, a contact terminal provided for each lead wire, and a contact terminal connected to the outside of the main body. By operating the control knob exposed to
The electric motor was controlled by opening and closing the contact terminals.

However, with this type of structure, the contact part of the switch device must be placed near the operating knob exposed outside the main body, so if the operating knob gets wet with liquid such as water, there may be problems such as poor insulation of the contact part, etc. An abnormality had occurred. Furthermore, in order to prevent such abnormalities, a waterproof structure is required, which increases the cost of the switch section. Therefore, the present invention provides the following advantages: by arranging the contact part of the switch device inside the cooking machine main body,
In addition to solving the above problems, the present invention also solves the problem of foreign matter such as powder entering from outside the main body and adhering to the contact portion of the switch device, resulting in contact failure.

One embodiment of the present invention will be described below with reference to the drawings, taking a hand mixer as an example. In the figure, reference numeral 1 denotes an armature of a motor, which is held at both ends by bearings 3 and is attached to a lower main body 5 via a motor frame 4.

Reference numeral 5 denotes a field portion of the electric motor, which is attached to the main body 5 via the motor frame 4.

The front part of the main body 5 is provided with an air hole 5a for taking in cooling air. A worm gear 6 is formed at the tip of the shaft 1' of the armature 1, and rotates two gears 7 provided on the left and right sides.

Reference numeral 9 denotes a stirring blade in which a shaft 10 is removably fitted into a shaft portion 8 provided on a gear 7. By rotating the pair of stirring blades, cooking such as whisking can be performed.

Reference numeral 11 denotes an upper body of the hand mixer having a handle 11', which is integrally attached to the body 5 with screws 12.

Speed control terminals 2a, 2b, 2c, and 2d made of a spring material are formed on the upper end surface of the field portion 2 of the electric motor, and a conductor 13 is fixed on the upper surface inside the main body 11 facing thereto.

Reference numeral 14 denotes a plate-shaped insulator having cutout holes 14a to 14d corresponding to the speed control terminals 2a to 2d, and is located between the speed control terminals 2a, 2b, 2c, and 2d and the conductor 13. The connecting portion 15a of the operation knob 15, which is formed integrally with the conductor 13 and exposed to the outside of the main body 11, and the locking hole 14e of the insulator are fitted and connected. The operating knob 15 is held by a metal fitting 16, and the metal fitting 16 is fixed to the main body 11 with screws 17. In addition, a portion of the insulator 14 has an uneven portion 14.
A convex portion 20a of the spring member 20 made of an insulating material is in elastic contact with a concave portion of the insulating material 14, and the convex portion 20a of the spring member 20 made of an insulating material is in elastic contact with the concave and convex portion 14f. The spring member 20 is attached to the main body 11 with screws 21. 18 is a power cord connected to the electric motor section.

A brush spring 19 is held in the field part 2 of the electric motor.

22 is a cooling fan of an electric motor fixed to the shaft 1''.

Speed control terminals 2a provided in the field portion 2 of the electric motor are common terminals, 2b is a low speed terminal, 2c is a medium speed terminal, and 2d is a high speed terminal. In addition, a notch hole 14 formed in the insulator 14
A is a hole for a common terminal, 14b is a hole for a low speed terminal, 14c is a hole for a medium speed terminal, and 14d is a hole for a high speed terminal. The conductor 13 also has speed control terminals 2 of the motor 1 located in the terminal holes 14b to 14d (excluding the common terminal hole 14a).
Convex portions 13a facing b to 2d are formed. Next, the operation of the above-mentioned switch device and its operation will be explained.
In FIG. 1, the speed control terminal 2a is located in the common terminal hole 14a and is in contact with the conductor 13, but the other terminals 2b, 2c
, 2d are insulated by the insulator 14 and are not in contact with the conductor 13, so the motor 1 is in a stopped state. Therefore, as shown in FIG. 2, when the operating knob 15 is operated in the direction of the arrow, it rotates around the center point 15b held by the metal fitting 16. Therefore, the insulator 14 moves horizontally, and the convex portion 20a of the spring member 20 moves to the uneven portion 14 provided on the insulator 14.
Pass over the convex part f and fit into the next concave part. At that time, the common terminal 2a is in contact with the conductor 13 as it is, the low speed terminal 2b is located in the low speed terminal hole 14b, and the convex portion 13a of the conductor 13 is placed in the position of the low speed terminal hole 14b.
Since the terminals 2a and 2b shown in FIG. 4 are in contact with the conductor 13,
The electric motor 1 rotates at a low speed. In the same way as above, if you operate knob 15 further, the fourth
Terminals 2a and 2c shown in the figure are connected through a conductor 13 and rotate at a medium speed (not shown), and terminals 2a and 2d are connected through a conductor 13 and rotate at a high speed (not shown). At this time, the convex portion 20a of the spring member 20 is similar to the convex portion 14 of the insulator 14.
Go over the convex part f and fit in the next concave part. However, such a switch device has one drawback. When the cooling fan 22 fixed to the armature shaft 1'' sucks air through the air hole 5a to cool the electric motor 1, it also sucks in foreign matter such as powder.
3 and the speed control terminals 2a to 2d, causing contact failure. In particular, since the speed control terminals 2b to 2d are only in sliding pressure contact with the conductor 13, the above-mentioned defects are likely to occur. Therefore, as shown in FIG. 6, by forming a convex portion 13a on a portion of the conductor 13 facing the speed control terminals 2b to 2d, the speed control terminals 2b to 2d are
Since the contact portion d is cleaned and comes into sliding contact with the conductor 13a, the above problem can be solved.
In this way, the present invention forms a speed control terminal on an electric motor, and interposes an insulator with a cutout hole between it and the conductor.
Since a convex portion is formed on the conductor and brought into contact with and separated from the speed control terminal, the contact portion is cleaned every time the speed is changed, and reliable control can be performed. In addition, since the contact portion of the switch device can be located inside the main body, the switch device of the cooking machine has a simple structure, is highly safe, uses low resources, is high in quality, is low in cost, and has good assembly.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hand mixer showing an embodiment of the present invention, FIG. 2 is a sectional view of the main parts showing the electric motor in a low speed rotation state,
FIG. 3 is a perspective view of the field portion of the motor, FIG. 4 is a circuit diagram of the motor, FIG. 5 is a perspective view of an insulator, and FIG. 6 is a detailed sectional view of a contact portion. 2... Field part of the motor, 2a to 2d...
... Speed control terminal, 5, 11 ... Main body, 13.
...Conductor, 13a...Protrusion, 14...
...Insulator, 14a-14d...notch hole.

Claims (1)

[Claims] 1 A motor with a speed control terminal formed thereon and a conductor separate from the motor are provided in the main body, and several notched holes are provided between the speed control terminal and the conductor to fix the conductor. By interposing an insulator and moving the insulator and the conductor, the speed control terminal is positioned in the cutout hole of the insulator and brought into contact with the conductor, and a convex portion is formed on the conductor facing the speed control terminal of the motor. A switch device for a formed electric cooking machine.