JPH0677429B2 - Time switch - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a time switch whose on / off is reversed at a set time.

[Prior art]

As shown in FIG. 9, a time switch of this type conventionally provided includes a dial 1 which is rotationally driven at a constant speed by a drive source such as a motor, and is set on the periphery of the dial 1. The switch 3 is turned on / off in reverse according to the forward / backward movement of the claw piece 2a of the child 2. That is, by the detection lever 4 that contacts the peripheral surface of the dial 1,
It is detected whether or not the claw piece 2a of the setting element 2 projects from the peripheral portion of the dial 1, and the swing of the drive arm 5 coupled to the detection lever 4 is transmitted to the actuator 7 of the switch 3 via the drive lever 6. It is like this. The drive lever 6 is axially supported by the switching cam 8 and is interposed between the tip of the drive arm 5 and the actuator 7. Further, the actuator 7 is provided at a position where both the drive lever 6 and the switching cam 8 can come into contact with each other. Here, the switching cam 8 is related to the position where the forward / backward movement of the actuator 7 is interlocked with the swing of the drive lever 6, the position where the actuator 7 is continuously pushed regardless of the swing of the drive lever 6, and the swing of the drive lever 6. Instead, it is possible to select three positions, that is, a position where the actuator 7 is continuously projected.

[Problems to be Solved by the Invention]

With the time switch having the above configuration, as shown in FIG. 10 (a), it is possible to set an on time when the switch 3 is turned on and an off time when the switch 3 is turned off. As in (b), it is not possible to set only the on time at which the switch 3 is turned on and turn it off after the elapse of the fixed time T. In other words, it is necessary to set the on time and off time. Further, since the time to be turned on is set by advancing and retracting the claw piece 2a of the setter 2, the settable time unit is fixed, and only a relatively coarse setting such as 15 minutes interval can be made. Furthermore, because it is mechanically set to on / off,
This is inconvenient when the accuracy of the time interval is relatively poor and accuracy is required during the ON time. The present invention is intended to solve the above-mentioned problems, and at the set time, the on / off is inverted and the original is returned after a certain time, and the time during the inversion is set accurately and arbitrarily. It is intended to provide a time switch that can be done.

[Means for Solving the Problems]

In the present invention, in order to achieve the above object, a timer circuit that starts a time limit when a switch opened and closed by a dial setter is turned on, and is controlled so that on / off is reversed only during the time limit of the timer circuit. And a switch element for load control according to the present invention. In addition, a mode selection switch is added to select the state in which the on / off of the switch element is controlled so as to correspond to the on / off of the switch and the state in which the on / off is controlled to be inverted only during the time limit of the timer circuit. You may.

[Action]

According to the above configuration, the switch is turned on at the time set by the setter provided on the dial, and then the on / off of the switch element is reversed by the timer circuit for a fixed time, so that only the on time is set. , It can be turned on for a certain period of time. Further, since the time to be turned on is set by the timer circuit, the time can be set more accurately and the set time unit can be made finer as compared with the case where it is set by mechanical means. Further, when the mode selection switch is provided, the mode for setting the on-time and the off-time and the mode for turning off after a fixed time can be selected by designating the on-time, so that the usage is expanded. .

Embodiment 1 The basic part of the mechanical structure is as shown in FIG.
Since it is well known in the art, the description thereof will be omitted and the circuit portion of the present invention will be mainly described. As shown in FIGS. 1 and 2, the power supply circuit 10 is connected to a commercial AC power supply via a motor M composed of a motor.
The motor M rotates the dial 1 at a constant speed, and the switch 3 is turned on / off according to the position of the setting element 2 provided on the dial 1. The power supply circuit 10 includes a bridge rectifier BR, and the bridge rectifier BR is connected to the motor M in series. A display circuit 22 having a light emitting diode LD ₁ is inserted between the negative output end of the bridge rectifier BR and the power supply side terminal of the motor M, and the light emitting diode is inserted in a half cycle of the commercial AC power supply.
LD ₁ lights up. The power supply circuit 10 is configured by connecting a parallel circuit of a constant voltage diode ZD and smoothing capacitors C ₁ and C ₂ between the output terminals of the bridge rectifier BR, and supplies a DC voltage. The switch 3 that is opened and closed according to the rotation of the motor M is inserted between the power supply circuit 10 and the timer circuit 11, and the timer circuit 11 is supplied with power while the switch 3 is closed. The main part of the timer circuit 11 is composed of a timer integrated circuit 12,
Time setting unit 13 consisting of capacitor C ₃ and variable resistor VR ₁
Allows you to adjust the time limit. Also,
The output of the timer integrated circuit 12 is inverted by the transistor Q. The timer circuit 11 is also provided with a variable resistor VR ₂ for finely adjusting the time limit. The output of the timer circuit 11 is input to the relay drive circuit 15 via the output selection switch 14, and the coil of the relay Ry is energized while the output level of the timer circuit 11 is "H".
The output selection switch 14 sets the input end of the relay drive circuit 15 to one of a state where it is connected to the power supply circuit 10, a state where it is connected to the output end of the timer circuit 11 and a state where it is not connected to other circuits. Set. In addition, the relay drive circuit 15
The input terminal is connected to the gate of the thyristor SCR, the coil of the relay Ry is connected in series to the anode of the thyristor SCR via the current limiting resistor R, and the light emitting diode LD ₂ is connected in series to the cathode of the thyristor SCR. It Relay ry
Coil, resistor R, thyristor SCR, light emitting diode LD ₂
The series circuit of is inserted between the power source side terminal of the motor M and the negative side output terminal of the bridge rectifier circuit BR. Here, the contact r of the relay Ry is connected to the load, and the relay Ry
Functions as a switch element for load control. According to the above configuration, when the dial 1 is rotated by the motor M and the switch 3 is closed corresponding to the position of the setting element 2 (FIG. 3 (a)), power is supplied to the timer circuit 11, so the switch 3 When is closed, the timer circuit 11 starts the timed operation. At this time, the output level of the timer integrated circuit 12 is "L"
(FIG. 3 (b)), the transistor Q becomes conductive, so that the collector of the transistor Q becomes "H" (FIG. 3 (c)). That is, the output level of the timer circuit 11 is "H".
It becomes. Here, when the timer circuit 11 is connected to the relay drive circuit 15 by the output selection switch 14, the gate of the thyristor SCR becomes “H”, so the thyristor SCR turns on in a half cycle of the commercial AC power supply, and the relay The coil of Ry and the light emitting diode LD ₂ are energized (Fig. 3 (d)). Thus, the relay Ry is driven, and the fact that the relay Ry is driven is indicated by the lighting of the light emitting diode LD ₂ . When the predetermined time T set by the time setting unit 13 has elapsed since the timer circuit 11 started the time-delayed operation, the timer integrated circuit
Since the output level of 12 becomes "H" (Fig. 3 (b)), the output level of the timer circuit 11 becomes "L" (Fig. 3 (c)), and the thyristor SCR anode and cathode are reversed. The thyristor SCR is turned off in a half cycle where a voltage is applied, and thereafter the energization of the coil of the relay Ry is stopped (3rd
Figure (d)). At this point, the light emitting diode LD ₂ is also turned off. As described above, when the relay drive circuit 15 is connected to the timer circuit 11 by the output selection switch 14,
From the time when the motor M rotates and the switch 3 closes until the time-delay operation of the timer circuit 11 ends, the coil of the relay Ry is energized, and if the contact r of the relay Ry is a normally open contact, it turns on. If it is a normally closed contact, it will be off. Further, when the time during which the switch 3 is closed is shorter than the time from the start to the end of the timed operation, the operation of the timer circuit 11 is stopped, so that the energization of the coil of the relay Ry is stopped.
The switch 3 has priority over the off operation of the thyristor SCR. When the state in which the input end of the relay drive circuit 15 is connected to the power supply circuit 10 is selected by the output selection switch 14, the input level to the gate of the thyristor SCR is always "H". In the cycle, the coil of relay Ry is always energized. Further, when the state where no other circuit is connected to the input end of the relay drive circuit 15 is selected, the thyristor SCR is always off and the coil of the relay Ry is not energized. The circuit described above is housed in a case 9 in which the dial 1 is exposed, as shown in FIG. The light emitting diode LD ₁ is
When the commercial AC power supply is connected and the motor M is rotating, a power-on display is performed, and the light emitting diode LD ₂ is connected to the relay R.
When y is driven, an operation display that lights up is displayed, and it is housed in the same package 23 and exposed from one place of the case 9. Further, since the output selection switch 14 and the variable resistor VR ₁ for setting the time limit also need to be operated, the respective knobs 16 and 17 are exposed from the case 9. Variable resistor V
R ₂ is for finely adjusting the deviation between the scale provided on the knob 17 and the actual time limit before shipping the product, and cannot be adjusted from outside the case 9. In case 9,
The power supply terminal 18 connected to the commercial AC power supply and the load terminal 19 connected to the load are exposed.

Second Embodiment In this embodiment, as shown in FIGS. 5 and 6, a mode selection switch 20 is inserted between the output end of the timer integrated circuit 12 and the base of the transistor Q. is doing. That is, the mode selection switch 20 selects a state in which the output end of the timer integrated circuit 12 is connected to the base of the transistor Q and a state in which the base of the transistor Q is connected to the negative side of the power supply circuit 10, and the latter In this state, when the switch 3 is on (Fig. 7 (a)), the transistor Q is always on (Fig. 7 (b)), so that the output level of the timer circuit 11 is always "H", The thyristor SCR is turned on and the coil of the relay Ry is energized (7th
Figure (c)). Therefore, ON / OFF of the thyristor SCR is determined according to ON / OFF of the switch 3, and the contact r of the relay Ry is turned ON / OFF according to the position of the setter 2 of the dial 1 rotated by the motor M. Will be turned off. That is, the mode selection switch 20 is set to dial 1
There is a selection between a state in which the on-time and the off-time are specified by the setter 2 of No. 1 and a state in which only the on-time is specified by the setter 2 of the dial 1 and the contact of the relay Ry is reversed for a certain period from the on-time. . In the case of this configuration, since it is necessary to operate the mode selection switch 20, the knob 21 of the mode selection switch 20 is exposed from the case 9 as shown in FIG.

【The invention's effect】

INDUSTRIAL APPLICABILITY As described above, the present invention provides a timer circuit that starts a time limit when a switch that is opened and closed by a dial setting element is turned on, and a load control that is controlled so that on / off is reversed only during the time limit of the timer circuit. The switch element turns on at the time set by the setter provided on the dial, and after that, the timer circuit reverses the on / off of the switch element for a fixed time. It can be turned on for a fixed time only by setting the on time. Also, since the time to turn on is set by the timer circuit, it is possible to set an accurate time as compared with the case where it is set by mechanical means, and
There is an advantage that the set time unit can be made fine. Further, when the mode selection switch is provided, a mode in which the on time and the off time are set and a mode in which the on time is turned off after a predetermined time can be selected, and the usage is expanded. In other words, there is an advantage that two operation modes can be selected and used properly according to the purpose.

[Brief description of drawings]

FIG. 1 is a block diagram showing Embodiment 1 of the present invention, FIG. 2 is a specific circuit diagram of the same as above, FIG. 3 is an operation explanatory diagram of the same as above, FIG. 4 is an external front view of the same as above, and FIG. FIG. 6 is a block diagram showing a second embodiment of the invention, FIG. 6 is a detailed circuit diagram of the same as above, FIG. 7 is an operation explanatory diagram of the same as above, FIG. 8 is an external front view of the same as above, and FIG. FIG. 10 is a perspective view, and FIG. 10 is an operation explanatory view showing two kinds of operation modes of the time switch according to the present invention. 1 ... dial, 2 ... setter, 3 ... switch, 11 ...
… Timer circuit, 20 …… Mode selection switch, M …… Motor, Ry …… Relay.

Claims (2)

[Claims] 1. A dial which is rotationally driven at a constant speed, a setter which can project to and retract from a peripheral portion of the dial, and an on / off corresponding to the advance / retreat of the setter from the peripheral portion of the dial. Switch, a timer circuit that starts a time limit when the switch is turned on, and a load control switch element that is controlled so that on / off is inverted only during the time limit of the timer circuit. Time switch to do. 2. A dial which is rotationally driven at a constant speed, a setter which can project forwards and backwards to a peripheral portion of the dial, and an on / off corresponding to the advancement and retraction of the setter from the peripheral portion of the dial. Switch, a timer circuit that starts the time limit when the switch turns on, a switch element for load control, and the on / off state of the switch element
A time switch comprising a mode selection switch for selecting a state in which control is performed in response to turning off and a state in which control is performed so that on / off is inverted only during a time limit of the timer circuit.