JPS6037602Y2 - Output control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an output control device used in home appliances such as microwave ovens.

In microwave ovens, etc., it is difficult to change the power of the output radio waves emitted from the magnetron in stages, so the output power of the magnetron is kept constant and the output power is adjusted by energizing the magnetron intermittently. ing.

That is, this cycle is repeated for a desired period of time, such as energizing for 5 seconds and then powering off for 1 plow.

In this way, it is possible to provide a function that can handle cooking that requires low power and long periods of time, such as stewing.

Currently, these actions are performed using electronic circuits, etc.
This has the disadvantage of increasing the price.

In view of these points, it is an object of the present invention to provide a low-cost output control device that can adjust output power by changing the ratio of energization time to power outage time.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a synchronous motor 2 is mounted on a frame 1, a reduction gear mechanism M is connected to this synchronous motor 2, and an output gear 4 meshes with a gear 3 located at the terminal end of this reduction gear mechanism. , the output gear 4 is fixed to the narrow diameter part 5a of the cam holding member 5, and the large diameter part 5b forms a hexagonal prism, and the cam 6 is inserted into the hexagonal hole 6a drilled in the cam 6. They fit together so that they can slide in the direction.

A coil spring 7 is provided in the hole 6a formed in the cam 6.
is inserted, the cam 6 is urged upward by the coil spring 7, and the thrust washer W1 is fitted into a small recess 6b formed in the center of the upper surface of the cam 6.
It is in contact with the tip of the cam pressing member 8 via.

As shown in FIG. 2, the cam pressing member 8 has a bullet shape, the center of which is hollowed out in a cylindrical shape, and a spiral groove 8 is formed around the periphery.
A is formed in the spiral groove 8a, and a shut pin 10 fixed to the tip of a dial shaft 9 inserted into the hollowed out part of the cam pressing member 8 is engaged with the spiral groove 8a.

A dial 11 is attached to the upper end of the dial shaft 9, and a flange 9a is formed in the center thereof.
This flange 9a is held on the frame 1 via a thrust washer W2, and the shaft portion passing through the frame 1 is further attached to a disc spring 1 attached to the inside of the frame.
2 and the speed nut 13 attached below the disc spring 12, and is inserted into the cam pressing member 8.

As shown in FIG. 3, the cam 6 has a V-shaped notch 6c formed on its circumferential surface, and the width of the notch 6C in the circumferential direction increases as the cam 6 goes up and down in the figure. ,
The microswitch 14 is supported inside the frame 1 by a switch support 15 so that the insulator 14a contacts the circumferential surface of the cam 6.

Next, the effect will be explained.

FIG. 1 shows a case where the insulator 14a of the microswitch is in contact with the upper circumferential surface of the cam 6 (position a1 in FIG. 3), and in this case, the cam 6 is in contact with the cam pressing member 8.
The coil spring 7 is pushed down while being compressed to the lowest position.

In this state, when the synchronous motor 2 is driven, the cam 6 is rotated via the reduction gear mechanism M, the output gear 4, and the cam holding member 5.

At this time, the peripheral surface of the cam 6 at the a1 position is always pressing the insulator 14a, so the microswitch 14 is turned on.
state (continuously energized state).

Next, when the dial 11 is slightly rotated clockwise, the shut pin 10 attached to the lower end of the dial shaft moves clockwise in the spiral groove 8a.

As a result, the cam pressing member 8 is lifted and the cam 6 is also raised by the action of the coil spring 7, and the a2 position (FIG. 3) on the circumferential surface of the cam 6 comes into contact with the insulator 14a.

In this state, when the cam 6 rotates, the microswitch 14 is turned on while the insulator 14a is in contact with the peripheral surface other than the notch, and is turned off when it falls into the notch 6c.

That is, the microswitch 14 is turned off for a time corresponding to the width 11 of the notch at the a1 position, and the time required for the insulator 14a to pass through the area other than the notch is 41.
It is ON only for a certain amount of time.

These states are shown in the a□ and a2 sequence diagrams of FIG. 4, and when the cam 6 is further raised by the rotation of the dial 11 and the insulator 14a comes into contact with the a3 position, the notch width is 1° as shown in the a3 sequence diagram. The microswitch 14 is turned off for the time corresponding to , and turned on for the 12 hours required for the insulator 14a to pass through the area other than the notch.

Similarly, at the a4 position, the microswitch 14 is turned off for a time corresponding to the notch width 13, and the time required for the insulator 14a to pass through the area other than the notch is 43.
It is ON only for a certain amount of time.

In this way, by appropriately selecting the contact position between the insulator 14a and the notch 6C, the distribution ratio of the ON time and the OFF time can be changed proportionally within the time period (period T) for one revolution of the cam 6. Moreover, if the V-shaped notch shape is appropriately set, the continuous state can be changed to the minimum setting time (when the width of the notch at the lower end of the cam 6 covers almost the entire outer circumference, the ON state becomes the minimum, but that time is referred to as ) can be continuously varied.

In addition, since the insulator 14a of the microswitch always faces at right angles to the notch of the cam, the operation of the insulator 14a is smooth, and by appropriately selecting the pitch of the spiral groove 8a of the cam pressing member 8, the rotation angle of the dial can be adjusted. The scale of the set time (time to be in the ON state) for the amount of displacement can be set at equal or non-uniform intervals.

Since the present invention is constructed as described above, it has the effect of being able to change the ratio of the energization time and power outage time of a home appliance at a low cost with a simple structure, and that the output power can be adjusted appropriately.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the output control device of the present invention, FIG. 2 is a perspective view of the cam pressing member, and FIG. 3 is a perspective view of the cam and the fourth
The figure is a sequence diagram of the operating state of the present invention. 1...Frame, 2...Synchronous motor,
5...Cam holding member, 6...Cam, 6
c...Notch, butt...Cam pressing member, 1
4...Micro switch.

Claims (1)

[Scope of utility model registration request] A rotatable cam member is provided with cutouts having different widths in the circumferential direction at different positions in the axial direction, the cam member is held slidably in the axial direction, and the cam member is rotated by a synchronous motor. a cam holding member interposed between the cam member and the cam holding member; an elastic member that elastically holds the cam member; An output control device comprising: a cam pressing member that moves with the cam member; and a microswitch disposed such that an insulator is in contact with the circumferential surface of the cam member.