JPH057636Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a numeral device used for setting cooking time, cooking temperature, etc. in a microwave oven.

[Prior art]

There are some microwave ovens that allow you to set the cooking time using a rotary control knob (for example, JP-A-60
−188735).

[Problem that the invention attempts to solve]

A knob that can be rotated without limit and the amount of numerical change per unit rotation is small allows precise settings, but if you want to change the setting to a value that is far away from the current value, it is necessary to use a large number of knobs. There is a hassle of having to rotate the
59-40488). On the other hand, it is possible to quickly set values that are widely separated by increasing the amount of numerical change per unit rotation, such as setting a certain range with a cooking time of 20 seconds and a certain range with a cooking time of 5 minutes. There is a method (Japanese Patent Application Laid-open No. 72730/1983), but this has the disadvantage that precise settings cannot be made in a long pitch range.

The present invention was developed to solve this problem.When the knob is rotated at high speed, the amount of numerical change per unit rotation becomes large, and conversely, when the knob is rotated at low speed, it becomes small. It is an object of the present invention to provide a number setting device capable of quickly and precisely setting numbers.

[Means for solving problems]

The number numeral device according to the present invention increases or decreases a numerical value according to the rotation angle of a rotating member, and includes means for detecting the rotational speed of the rotating member, and a numbering device that increases or decreases a numerical value based on the rotational speed detected by the means. and means for determining the value.

[Effect]

When the rotating member is rotated at a high speed, the increase/decrease value of the numerical value per unit amount of rotation, that is, per rotation angle becomes large, and when the rotating member is rotated at a low speed, this value becomes small.

Therefore, quick coarse adjustment and fine fine adjustment can be performed.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is an external view of a microwave oven equipped with the number setting device of the present invention for setting cooking time.
The front operation panel is equipped with a knob 1 for this number setting device and a display 2 for displaying the set numerical value.

FIG. 2 is a schematic diagram of a part of the rotating disc 3 concentrically connected to the knob 1 and disposed inside the operation panel, and the brushes A, B, and C in sliding contact therewith. The rotary disk 3 is made by printing a conductor layer 3a with a pattern as shown in the figure on the outer periphery of a disc made of an insulating material, and the pattern of the conductor layer 3a is formed by printing a pattern on the inner and outer peripheries of a circle 31 of an appropriate width. It has short circular arcs 32 and 33 of an appropriate width and an appropriate angle for setting,
The inner and outer arcs 32 and 33 are slightly out of phase. The brushes A, B, and C are in sliding contact with the outer arc 33, the circle 31, and the inner arc 32, respectively. And brush B is grounded.

Fig. 3 shows the main part of the electric circuit of this microwave oven. Brushes A and C are connected to a control unit 10 consisting of a microprocessor, a start key 4 is used to command the start of cooking, and a clear key is used to cancel the set contents. 5 (all provided on the operation panel) are connected. The content of the entered number is displayed on the display unit 2 controlled by the control unit 10. The control unit 10 issues a drive control signal to the drive circuit 6 in response to the operation of the start key 4 and the contents of the entered numbers, thereby driving the magnetron 7.

FIG. 4 shows changes in the potentials of the brushes A and C when the knob 1 is rotated to rotate the rotary disk 3, that is, the waveform of the pulse signal input to the control section 10. As shown in Figure 3, brushes A and C are pulled up via resistors, so if they are in contact with the grounded conductor layer 3a via brush B, they are at low level, and if they are not in contact, they are at low level. is at a high level. Since the inner and outer arcs 32 and 33 have different phases, the pulses obtained from the brushes A and C also have different phases. Therefore, the control unit 10 can determine the rotational direction of the rotary disk 3 from the level of the brush C-side pulse at the rising edge of the brush A-side pulse, for example.

FIG. 5 is a flowchart showing the control contents of the part related to the set number by operating the knob 1 of the control unit 10. When the power is turned on, the internal timer 1 is first activated.
The clock value T=0 is set to 1 and initialized.
Next, the pulse signal of brush A is read, and when this changes from high to low, the pulse signal of brush A is read again, and the pulse signal of brush B is read when this changes from low to high. In other words, the pulse signal of brush B at the time of the rise of the pulse signal of brush A is read. It is recognized that when the pulse signal level at this time is high, the turntable 3 is rotating clockwise, and when it is low, it is rotating counterclockwise. On the other hand, as described above, the time t from when the pulse signal of the brush A changes to low level until it changes to high level is measured by the timer 11, and in the next step of recognizing the rotational direction, the rotary disk 3 Calculate the rotation speed N as 1/T. Then, an increase/decrease value M of the numerical value to be set in the register 12 for storing cooking time is calculated according to a preset function M=f(N).

Here, M=f(N) is a function that the larger N is, that is, the faster the speed, the larger the increase/decrease value M is, and the smaller N is, that is, the slower the speed, the smaller the increase/decrease value M is. Once the increase/decrease value M is determined, M is added or subtracted from the value in the register 12 depending on the direction of rotation. The numerical value of the coefficient obtained in this way is displayed on the display unit 2, and if this numerical value is smaller than 0 or the upper limit set as the possible cooking time, for example 99 minutes 59
If it is larger than seconds, the lower limit value 0 or the upper limit value 99 minutes 59 seconds is replaced as the set value.

The cooking time value set in this manner is transferred to a subtraction timer, and is subtracted by operating the start key 4, and when the remaining time reaches 0, the magnetron is stopped.

Note that the present invention is not limited to microwave ovens, but can also be applied to other devices such as chuuna.

〔effect〕

In the case of the number register device of the present invention as described above, the increase/decrease value M is large depending on the rotation speed of the rotating member.
Since the value is determined to be small, the rotating member can be rotated at high speed to quickly reach a desired value, and then rotated at a low speed to accurately set the desired value.
In other words, it is possible to quickly and precisely set numbers.

[Brief explanation of the drawing]

Fig. 1 is an external view of a microwave oven equipped with a number setting device according to the present invention, Fig. 2 is a schematic diagram showing a part of the rotary disk, and Fig. 3 is a block diagram of the main parts of the microwave oven according to the present invention. FIG. 4 is a waveform diagram of a pulse signal obtained from the brush, and FIG. 5 is a flowchart showing the control contents of the control section. A, B, C...Brush, 1...Knob, 2...
Display section, 3... Turntable, 10... Control section, 11...
...Timer, 12...Register.

Claims (1)

[Scope of utility model registration request] A number setting device that increases or decreases a numerical value according to the rotation angle of a rotating member, comprising means for detecting the rotational speed of the rotating member, and means for determining an increase or decrease value based on the rotational speed detected by the means. A numeral device characterized by: