JPS63221526A - Switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a switch mechanism that performs intermittent control of equipment at arbitrarily set time limits and at fixed intervals.

Conventional technology Traditionally, switches for controlling equipment include time switches that can set a time limit when the user wants the equipment to operate for a desired amount of time, and time switches that allow the equipment to operate intermittently and have a range of capability (output) during continuous operation. In order to operate at a fraction of the capacity, there is an on/off switch that repeats closing and opening at predetermined intervals. Regarding the switches mentioned above, both require accurate time measurement to open and close the circuit, so for example, a synchronous motor that can obtain a constant rotation speed depending on the AC power frequency is used to ensure accurate time limits and cycles. . FIG. 7 shows the circuit of an electric heating device as an example, and the heating element 1, which is the load of the device, has a timed contact 2 arbitrarily set by the user and an intermittent contact 3 that opens and closes the contact at a constant cycle. Power source 4 is supplied with both circuits closed.

6 is a synchronous motor that rotates at a constant speed to open time contact 2, and 6 is also an intermittent contact? It is a synchronous motor that rotates at a constant speed to create a constant cycle of opening and opening. It is necessary to arbitrarily set the length of time that the electric heating device is used, and to set the amount of heat generated by the electric heating device to a high temperature by continuous operation and a low temperature by intermittent operation. Control of time limit and capacity (output) is also commonly performed in these devices. FIGS. 8 and 9 are a plan view and a side view showing the structure of the time switch and intermittent switch. The constant speed N of the synchronous motor 6 obtained by the power supply frequency f follows N=120I (P is the number of poles of the motor). This constant rotation speed is the output shaft gear 8
The speed is reduced to an appropriate speed by reduction gear 9°10.11, and then transmitted to final gear 12. The final gear is provided with a cam 13 that is in the same state after one rotation.

When the cam 13 is rotated by the lever 14 in contact with the cam 13, the lever 14 is pushed up and presses the movable contact lever 15 against the fixed contact lever 16, thereby establishing conduction between the contacts. In the case of a time switch, the desired time limit can be obtained by rotating the main shaft 1 in the direction of the arrow in the figure and setting the cam 13 at an arbitrary angle.

This allows the clutch plate 18 to connect the cam 13 and the final gear 12 without causing the final gear 12 to rotate when the main shaft 17 rotates.
After the cam 13 is set at a desired position (angle) without rotating the reduction gears 9, 10, 11, etc., the synchronous motor 6 starts rotating and returns the cam 13 to its original position. When a predetermined period of time has elapsed, the lever 14, which had been pushed up, falls into the cam 13, and contact begins.

In the case of an on/off switch, there is no main shaft 17 and clutch plate 18, and the cam 13 rotates repeatedly to continue on and off. Of course, the intermittent cycle can be changed at any time by changing the ratio of the reduction gear. When the intermittent operation is stopped and the continuous operation is performed, the movable contact lever 16 is pressed against the fixed contact lever 16 by pushing down the continuous lever 19 in the direction B in the figure, and the circuit can be closed continuously.

Problems to be Solved by the Invention These conventional switch mechanisms require expensive motors and contacts for each time switch and on/off switch.

Even if the two are combined, it is possible to make them the same since the motor only drives the rotation, but as for the contact points, the set time and intermittent period or rate are independent, so it is best to make them the same. Even though it is desired to open the circuit after a period of time has elapsed, a state may occur in which the intermittent cycle is closed. Furthermore, even if it is desired to change the intermittent switch to continuous operation, there are problems such as continuous operation occurring even after the set time has elapsed, making it impossible to realize this.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention does not provide a time switch and an on/off switch separately, but consists of a contact driven by a single motor, and a contact corresponding to the time switch is provided. A switch that has a composite contact drive system that prioritizes the drive system over a contact drive system equivalent to an on/off switch? This is what we provide.

In the present invention, after the timer contact corresponding to the time switch operates with the above-described configuration, the intermittent contact corresponding to the intermittent switch is released from the drive system by the motor, so that the intermittent contact returns to the free position and the timer contact becomes intermittent. The time switch and the on/off switch can be combined, such as having priority over the contact, and allowing continuous operation of the on/off contact as long as the set time of the timed contact is not met.

Embodiment FIG. 2 is a circuit diagram showing an embodiment in which the switch of the present invention is installed in equipment. In FIG. 2, 20 is a load that performs the function of the device, for example, a heating element in the case of an electric heater, and the composite contact 21 of the switch according to the present invention continuously controls the amount of heat generated by the electric heater for a time arbitrarily set by the user. It is the only one provided in series between the power supply 22 and the load 21 because it is possible to set the operating time and output (capacity) to either raise the temperature by operation or to lower the temperature by intermittent operation. The drive motor 23 obtains constant speed rotation based on the power supply frequency, and plays the role of measuring the elapsed time from the aforementioned set time and keeping the intermittent period and ratio constant.

1 and 3 are a plan view and a side view showing an embodiment of the configuration of a switch according to the present invention, and the explanation will be made based on the figures.

In the figure, 24 is a synchronous motor that rotates at a constant speed depending on the power frequency. It has gained. This constant rotation speed is the output gear
26 and further reduction gear 26 #27 #2
The rotational speed of the final gear 29, which is reduced to an appropriate rotational speed by B and transmitted to the final gear 29, is determined by the reduction gears 26, 27, and 28 so that it rotates approximately once in the maximum settable time. The final gear 29 is provided with a timer cam 31 coaxially with the main shaft 30 as its central axis. 32
is a contact lever, and the corresponding time is set by rotating the main shaft 30 in the direction shown in the figure to a desired angle, and by rotating the time cam 31, the time contact spring 33 is pushed against the intermittent contact spring 34. guess. 35 is a reversing lever, which is operated by the tip of the contact lever 32. 36 is a connecting lever, and the movement of the reversing lever 36 is controlled by the idle gear 3.
Tell 7. A coil spring 38 has one end fixed to the connecting lever 3θ and the other end fixed to the switch body 39, and constantly biases the connecting lever in the direction B. Reference numeral 40 is a transmission gear, which is provided at a position where it meshes with the floating gear 37 when the floating gear moves in the direction B, and is always meshed with the intermittent gear 41. An intermittent cam 41 is provided coaxially with the intermittent gear 41, and when it rotates, it pushes up the intermittent contact spring 34 and opens the contact.

Although FIGS. 1 and 3 show a state where the operating time is not set, FIG. 4 shows the movement of each part when the time is set.

In FIG. 4, when the main shaft 30 is rotated in the direction shown in FIG. 4, the timer cam 31 also rotates. In this case, the final gear 29 is connected to the timer cam 3 by a clutch plate (not shown) provided on the main shaft.
1 rotation is not transmitted and the clutch plate slips. When the time cam 31 rotates, the contact lever 32 rotates about the shaft in the direction B and pushes up the time contact spring 33. The tip of the contact lever 32 moves in the C direction, the reversing lever 36 is released from its position restriction, rotates in the D direction by the force of the coil spring 38, and the connecting lever 38 moves in the E direction accordingly. An idler gear 37 provided at the tip of the connecting lever meshes with the reduction gear 28 and transmits the transmission gear 40'i.
In order to transmit the driving force to the intermittent gear 41 via the intermittent cam 42, the intermittent cam 42 starts rotating.

FIG. 6 shows a state in which the intermittent cam 42 begins to rotate and reaches a predetermined position.

In FIG. 5, the disconnection cam 42 rotates in the direction F, pushing up the disconnection contact spring 34 and opening the circuit.

Since the intermittent cam 420 continues to rotate until the timer cam 31 returns to its original position, the contact is repeatedly interrupted. When the time cam 31 returns to its original state, the contact lever 32 is lowered and in the reverse order described above, the idle gear 37 is separated from the reduction gear 28 and transmission gear 40, allowing the transmission gear 40 and the intermittent gear 41 to rotate freely. Regardless of the state of the intermittent cam 42, the restoring force of the intermittent contact spring 34 causes the intermittent cam 42 to enter the state shown in FIGS. 1 and 3. Therefore, the intermittent cam 42 operates only when the timed cam 31 is set and stops operating when the timed cam 31 returns, so the timed cam can be given priority over the intermittent cam. Furthermore, by moving the reversing lever 36 in the 0 direction from the outside in the state shown in FIG. 40, the circuit can be closed continuously without the intermittent cam 42 rotating.

The above embodiment has a structure in which the switch body has a contact that uses the displacement of a spring, but an external microswitch is installed that instantly reverses the contact, which is generally used to open and close the circuit of equipment. An example is shown in FIG. The basic configuration is the same as the first embodiment, but the operating lever 46 that operates the actuator 44 that opens and closes the microswitch 43 is formed of a spring, and the timer cam 31 is
In this setting state, the actuator 44 is pushed down to close the contact, and the rotation of the intermittent cam 42 pushes the spring of the operating lever 46 upwards, causing the actuator 44 to forcibly remove the entire spring. As in the first embodiment, the timer cam 31 has priority over the intermittent cam 42, and the contact points can be shared.

Effects of the Invention As described above, according to the present invention, all intermittent contact drive systems can be selected as the main time contact drive system depending on whether or not time is set in the conventional time switch mechanism. With a simple configuration that only includes a structure for transmitting signals, it is possible to use one switch for timed control and intermittent control, which is not only extremely economical but also provides the following effects. In other words, since the switches can be consolidated, (1) the equipment itself can be made smaller and lighter; (0) circuit connections are simplified and reliability is improved; (2) operability is improved because the operating parts can be concentrated.

[Brief explanation of drawings]

Fig. 1 is a plan view of a switch according to an embodiment of the present invention, Fig. 2 is a circuit diagram of the same, Fig. 3 is a side sectional view showing the inside of the switch, and Fig. 4 is a portion showing the operating state of the switch. Does the top view, Figure 5, show other operating states of the same switch? 6 is a partial plan view showing the inside of a switch according to another embodiment of the present invention, FIG. 7 is a circuit diagram of a conventional switch installed in a device, and FIG. 8 is a partial plan view showing the inside of a conventional switch. 9th plan view showing
The figure is a sectional view of the same side. 24...Motor, 31...e time cam, 32...contact lever, 33...time contact spring, 34...intermittent contact spring , 35...
... Reversing lever, 36 ... Connection lever, 37
...Idle gear, 42...Intermittent cam,
43...Micro switch, 44...
Actuator, a s...Operating lever. Name of agent: Patent attorney Toshio Nakao and 1 other personz4
- Motor 31 one-time cam I-Pupil lever 33-Ran 11. Spring 36'' series lever 37-Ml engagement, -η・-WlrMJ cam Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6v!J etc. Fig. 7

Claims (2)

[Claims] (1) A motor that rotates at a constant speed depending on the power supply frequency, an opening/closing contact that repeats opening and closing of the circuit at regular intervals by a first cam with an intermittent part that is rotationally driven by the motor, and an opening/closing contact that repeats the opening and closing of the circuit at regular intervals, and the intermittent part is connected from the outside. The rotation angle of the second cam can be arbitrarily set, and the second cam is rotationally driven by the rotation of the motor, returns to the position before setting, and after a set time elapses, the circuit is opened or closed in a single manner. A switch having a timer contact, wherein the opening/closing contact and the timer contact are the same contact. (2) The first cam returns to the position before the second cam was set,
The switch according to claim 1, wherein the switch is configured to be released from a motor drive system after the contact operates.