JPS6132770B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a timer used in electric appliances such as microwave ovens, and is capable of switching the output of the appliance when only thawing frozen food. It is possible to operate a small capacity without changing the output of a fixed capacity of the device, and furthermore, it can be done with a small number of parts even though the value of the small capacity can be changed. This is an attempt to provide a timer that does this.

The drawings showing the embodiments of the present application will be described below. 1 is a power supply, which is generally a 100V AC commercial power supply. 2 indicates any load attached to the electrical appliance. This is an electromagnetic wave radiator such as a magnetron in the case of a microwave oven, and a motor in the case of a washing machine or mixer. Next, a timer consisting of a time limit setting mechanism 3 and an intermittent switch mechanism interposed in a circuit connecting the power source 1 and the load 2 will be explained. As is well known, the time setting mechanism 3 is operated by a cam switch 5 (not shown) operated by a timer motor 4.
The circuit is designed to open and close to allow current to pass through the load for any length of time. Next, in the intermittent switch mechanism, reference numeral 6 denotes a cam switch mechanism, which is composed of two reversing cam switches 7 and 8 and a timer motor 9. In this reversing cam switch 7, 7
A is a first contact, 7b is a second contact, and 7c is a movable contact, and these are driven by a cam 7a driven by a timer motor 9, so that they perform reversal operations with different closing times as shown in FIG. It is set as. Since the reversing cam switch 8 has the same structure as the switch 7, the numerical code "8" and the same alphanumeric characters "a, b, c, d" as the switch 7 will be added to each member correspondingly, and the explanations will be repeated. Omitted. The double reversing cam switches 7 and 8 have respective cams 7d and 8d attached to one cam shaft 10 as shown in FIG. As shown, there is an overlap time of Δt. In FIG. 4, t ₁ to t ₄ indicate the closing time of each switch, and the unit is seconds. Reference numeral 11 denotes a select switch, which is comprised of a plurality of switches S ₁ to _{S 5} that select intermittent time, and a switch S ₀ that selects continuous operation. Note that when any of the switches S ₁ to S ₅ is pressed (ON), switch S ₀ switches to the state shown in Figure 2, and when this switch S ₀ is pressed When operated, everything is configured to return to the state shown in FIG. 1. Incidentally, these may be connected to the time limit setting mechanism 3 so that the state shown in FIG. 1 is returned to when the operation of the mechanism 3 is completed.

Due to the presence of the intermittent switch mechanism, the cam switch 5 is interposed between the first terminal of the intermittent switch mechanism and one end of the power source 1. The load 2 is interposed between the second terminal of the intermittent switch mechanism and the other end of the power source 1.

In the above configuration, when the switch _S0 is pressed as shown in FIG. condition, load 2
operates continuously for the time set in the time limit setting mechanism 3. Next, when _the switch _S1 is pressed as shown in _FIG . Therefore, load 2 operates for 3 seconds with time period t ₁ and time period t ₂ shown in Figure 4.
Performs intermittent motion, repeatedly stopping for 15 seconds. Therefore, the load has a small output of about 3/18 of the constant capacity. Next, as shown in FIG. 3, when switch _S3 is pressed, the current flows to cam switches 7 and 8.
Because it flows through the respective first contacts 7a and 8a,
Load 2 operates for 8.5 seconds, which is the sum of time periods _t1 and _t3 minus 0.5 seconds of overlap Δt.
The intermittent operation is performed by repeatedly subtracting t ₁ from time t ₄ and adding Δt to the stop for 9.5 seconds. Note that the operation when operating other switches S ₂ , S ₄ , and S ₅ is as follows.
Since it can be easily inferred from the figure, its explanation will be omitted.
Further, the time limits t ₁ to _{t 4} of the double reversing cam switches 7 and 8 are arbitrarily set depending on the type of load 2 or the purpose of its operation.

As described above, in the present invention, when power is supplied from the power source 1 to the load 2, the time period for which the power is supplied can be controlled by the cam switch 5 in the time limit setting mechanism 3. For example, if the load is a microwave oven, the power is supplied for a desired time. After that, the electricity can be cut off, which is useful for properly cooking the cooking ingredients.

Moreover, in the above case, even within the arbitrary time limit set by the time limit setting mechanism 3, the switches S ₅ , S ₄ , S ₂ , S ₁
By selectively closing each of the switches, the current is applied intermittently and the current application time is sequentially shortened according to each switch S ₅ , S ₄ , S ₂ , and S ₁ , thereby reducing the load to the load. It has the feature that the amount of power supplied can be sequentially decreased in four ways depending on the operation status of each switch. This has the effect that the amount of power supplied to the load 2 can be selected to suit the purpose of the user, and the load 2 can be caused to perform a desired operation. Moreover, as mentioned above, in addition to the maximum supply by continuous energization, the degree of power supply to load 2 can be changed by four types of intermittent energization with different energization times. The four types are the first and second cams, which are switched by two cams 7d and 8d, respectively.
Using the reversing cam switches 7 and 8, the first reversing cam switch 7 performs intermittent control of the shortest energizing time _t1 and the longest energizing time _t2 , and the second reversing cam switch 8 performs intermittent control of the shortest energizing time. Intermittent control is performed for t ₃ and medium-long energization time t ₄ (t ₁ < t ₃
<t ₄ < t ₂ ) and the time cycles of the first and second reversing cam switches 7, 8 are the same, so the two cams 7d, 8d
Even if the cams rotate, they are attached to one camshaft 9 and rotate that one camshaft 9, which is the simplest interlocking method and simply rotates two cams. It has the advantage of being controllable. This means that the cams 7d and 8d
An extremely simple structure is sufficient for turning the motor, which has the effect of extremely reducing the incidence of failure and reducing the price.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. 1 is a wiring diagram showing a normal usage state, Figs. 2 and 3 are partial wiring diagrams showing a small capacity operation state, and Fig. 4 is a wiring diagram showing a reversing cam switch. FIG. 5 is a front view of the reversing cam switch, and FIG. 6 is a diagram showing the relationship between both reversing cam switches. 2... Load, 3... Time limit setting mechanism, 7... Reversing cam switch, 7a... First contact, 7b... Second
Contact, 11...Select switch.

Claims (1)

[Claims] 1. A cam switch in a time setting mechanism, and an intermittent switch mechanism having a first terminal and a second terminal for circuit connection, and the intermittent switch mechanism includes:
The select switch 11 has a select switch 11 and two first and second reversing cam switches 7 and 8, and the select switch 11 includes a switch _S1, a switch S5, and a switch _S5 , each of which has one end electrically connected to the first terminal. The _upper air _first reversing cam switch 7 has a first contact 7a, a second contact 7b, a movable contact 7c connected thereto, and a movable contact 7c. and a cam 7d that alternately and repeatedly connects the first contact 7a and the second contact 7b to the first contact 7a and the second contact 7b, respectively.
The reversing cam switch 8 has a first contact 8a, a second contact 8b, and a movable contact 8c that switches and connects them.
, the movable contact 8c is connected to the first contact 8a and the second contact 8.
cam 8 which is alternately and repeatedly connected to b.
d, and the cams 7d and 8d are attached to one camshaft 10 and rotated together, and the movable contact 7c of the first reversing cam switch 7 is connected to the first contact 7a. time to connect
_t1 , the time tz at which the movable contact 7c connects to the second contact 7b, the time _t3 at which the movable contact 8c in the second reversing cam switch 8 connects to the first contact 8a, and the time t3 at which the movable contact 8c connects to the second contact 8b. The relationship between the switching operation cycle of the first and second reversing cam switches is the same, and t _{1 <} t ₃ < t ₄ < t ₂
Furthermore, the movable contact 7
c, 8c are connected to the second terminal, the other end of the switch _S1 is connected to the first contact 7a of the reversing cam switch 7, and the other end of the switch _S5 is connected to the second contact 7a.
b, the other end of the switch _S2 is connected to the first contact 8a of the reversing cam switch 8, and the other end of the switch _S4 is connected to the second contact 8a.
Furthermore, the first and second terminals of the intermittent switch mechanism are connected to the middle of a circuit connecting the power supply and the load, and the cam switch of the time setting mechanism is also connected to the A timer characterized by being connected in the middle of a circuit.