JPH0443950Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a time switch that can repeatedly turn on and off within a fixed time period, and can be used in electric fans and the like.

(Prior Art) Time switches, which can repeatedly turn on and off at relatively short intervals within a fixed time period, are used in electric fans and various other devices.

For example, in a time switch for an electric fan, a microcomputer uses a timer called sleep time to make the wind from the fan more natural.
During a set time, such as 3 hours or 3 hours,
There is one in which the fan motor is controlled to be turned on and off at relatively short intervals. However, using a microcomputer increases the cost, and since the operation part is unique to a microcomputer and is different from the previous mechanical operation part, it is difficult to use, especially for people who are not accustomed to using microcomputers, such as the elderly. It's not very convenient to use. Therefore, it is desired to implement on/off control at relatively short intervals using a mechanical time switch. This applies not only to electric fans but also to washing machines and other devices.

FIG. 15 shows a conventional example of a mechanical time switch. In FIG. 15, among three contacts 81, 82, 83 provided in parallel, contacts 81, 82 constitute a timer switch 76;
3 constitutes a main switch 77. Contact 8
A part of the contact 81 is in pressure contact with the cam surface of the timer cam 74, and when the cam 74 is not in operation, a part of the contact 81 is located in the notch of the cam 74, and the contacts 81, 82, and 83 are all separated. As shown in the figure, when the cam 74 is rotated by the time setting operation, a part of the contact 81 is pushed by the cam surface of the cam 74 and comes into pressure contact with the contact 82, which in turn is brought into pressure contact with the contact 83. ,
Eventually, the timer switch 76 and the main switch 77 are turned on. The cam 74 is the timer motor 7
2. The timer switch 76, the main switch 7, the timer motor 72, and the power supply 71 are connected in series. In addition to the cam 74, a periodic cam 75 is provided which is rotationally driven by a timer motor 72. A plurality of lift sections are formed on the circumferential surface of the cam 75, and the load drive switch 78, which is made up of contacts 78a and 78b, is turned on and off by the lift sections. This switch 7
8, the switch 77, a power source 71, and a fan motor 73 as a load are connected in series.

Now, when the timer cam 74 is rotated to set a timer, the contact 81 is pushed by the cam 74 and the contacts 81, 82, 83 are brought into contact as shown in the figure, and the drive circuit for the timer motor 72 is closed. The cam 74 is rotationally driven by the drive of the motor 72 to perform a timed operation, and the periodic operation cam 75 is rotationally driven to turn the load drive switch 78 on and off periodically, and the fan motor 73 as a load is rotated. It is turned on and off periodically.

(Problem that the invention aims to solve) According to the conventional time switch that turns on and off periodically, the load drive circuit has a main switch that turns on and off using a timed cam, and a main switch that turns on and off using a periodic cam. , and a load drive switch to be turned off must be connected in series, and a timer switch must be connected in series with the main switch to the timer motor drive circuit. Therefore,
The switch mechanism became complicated, the number of parts increased, and it was not possible to reduce the size of the switch mechanism. Such problems apply not only to electric fans but also to time switches in various devices that turn on and off load drive switches at relatively short intervals.

The present invention was devised to solve these conventional problems.By simplifying the switch mechanism, the number of parts can be reduced, and the switch can be miniaturized. The purpose is to provide a time switch.

(Means for Solving the Problems) The present invention has a timer cam that is rotationally driven by a motor, a timer switch that is turned on and off by the timer cam, and a plurality of lifting parts, and A periodic operation cam supported coaxially with the timer cam and rotated independently of the timer cam by the motor, and a periodic operation signal that is turned on and off by a plurality of lift parts of the periodic operation cam. It has a load drive switch to output the
The load drive switch is configured such that when the contact piece of the timer switch is displaced by the time setting operation of the timer cam, the load drive switch is displaced to a position where it is turned on and off at a plurality of lift sections of the periodic operation cam. It is characterized by being located.

(Function) By the time setting operation, the time cam is rotated to a position corresponding to the set time, the timer switch is turned on, and the motor is started. The timer cam and the periodic operation cam are rotationally driven by the activation of the motor, and the rotation of the timer cam performs the timer operation.
On the other hand, when the timer cam is rotated by the timer setting operation, the load drive switch is set to a position where the periodic operation cam turns on and off. A plurality of lift sections of the operating cam turn on and off a load drive switch to intermittently operate the load.

(Example) The illustrated example is an example of a time switch for an electric fan.

First, an embodiment of a time switch according to the present invention will be conceptually explained with reference to FIG. In FIG. 1, reference numeral 12 is a timed cam, and 13 is a periodic operation cam, and these cams are rotationally driven by a timer motor 11. The timer cam 12 performs a timer operation by turning on and off a timer switch 60. The periodic operation cam 13 has a plurality of lift parts 13a around the periphery. The plurality of lift sections 13a are used to turn on and off the load drive switch 62 in a relatively short time period. It is arranged so that it can be displaced to a position where it is turned on and off by the lift section 13a. Timer motor 11, timer switch 60, and power supply 19
are connected in series, and the fan motor 2 as a load
0, a load driving switch 62, and a power supply 19 are connected in series.

Now, when the timer cam 12 is rotated to set the timer, the timer switch 60 is turned on by the cam surface of the cam 12, the timer motor 11 is rotationally driven, and the timer cam 12 and the periodic operation cam 13 are rotated at predetermined speeds. Rotationally driven. When the timer cam 12 is rotated in the timer setting operation, the load drive switch 62 is displaced to a position where it is periodically turned on and off by the lift portion 13a of the periodic operation cam 13, and the periodic operation cam 13 is rotated. As a result, the load drive switch 62 is periodically turned on and off, and the fan motor 20 is periodically driven to rotate. timed cam 1
When the time set by 2 has elapsed, the same cam 12
returns to the original position and the switch 60 is turned off, and even if the switch 62 is on, it is displaced to the original position by the cam 12 and turned off.

In this way, by the time setting operation of the time cam 12, the load drive switch 62 is activated by the periodic operation cam 13.
Since the switch is moved to a position where it can be turned on and off with the button, the switch mechanism can be simplified.

In this specification, the term "period" refers to an on-off-on operating cycle in which the device is turned on and off at relatively short intervals, and includes not only cases in which the operating cycle is regular in time, but also cases in which the operating cycle is irregular in time.

Next, an embodiment of the time switch according to the present invention will be explained in detail with reference to FIGS. 2 to 14.

In FIGS. 2 to 6, block 10 is a time switch, 25 is a case of the above-mentioned time switch, and time switch 10 has a timer motor 11 built therein. A gear 26 on the output shaft rotationally driven by the timer motor 11 is connected to the case 2.
5 and meshes with the drive gear 27. The drive gear 27 is connected to the shaft 3 supported by the case 25.
0, and has a partially arc-shaped lock portion 28 along an arc centered on the rotation axis at the center, as well as a drive pin 29. A Geneva gear 31 is arranged on the side of the drive gear 27 and rotates around a shaft 32 . The Geneva gear 31 has a large number of open grooves 34 formed radially.
The outer peripheral surface between these grooves 34 has an engaging portion 3 that engages with the lock portion 28 of the drive gear 27.
It has become 3. In the groove 34 of the Geneva gear 31,
As the drive gear 27 rotates, the drive pin 29 engages to intermittently drive the Geneva gear 31 to rotate, and when the drive pin 29 is out of the groove 34, the drive gear is engaged with the engaging portion 33 of the Geneva gear 31. 2
The lock portion 28 of No. 7 engages to prevent the Geneva gear 31 from rotating. The Geneva mechanism itself, which intermittently transmits the rotational force of such a driving rotor, is well known.

The Geneva gear 31 has a small-diameter partially toothed gear 35 integrally in its center. The partially toothed gear 35 is
It forms an intermittent drive rotating body that decelerates the rotation of the output shaft of the motor 11. On the side of the Geneva gear 31, a large-diameter gear 36, a smaller-diameter gear 38, and a smaller-diameter partially toothed gear 39 are arranged. These gears 36, 38, and 39 are integrally formed and rotatably supported by a shaft 37 supported by the case 25. The large diameter gear 36 is the toothless gear 3.
It can mesh with the teeth 35a of No. 5. gear 3
Reference numerals 6 and 38 constitute an intermittent rotating body which is intermittently rotationally driven by the intermittent gear 35. The toothless gear 39 can mesh with the large diameter gear 40, and the small diameter gear 41 formed integrally with the gear 40 has the large diameter 42.
They are interlocked. The gear 42 integrally has a small diameter gear 43. These gears 40, 41, 4
2 and 43 constitute a reduction gear train.

A shaft 45 is integrally protruded from approximately the center of the case 25, and a shaft hole of a time setting shaft 46 is fitted into the shaft 45. One end of the time setting shaft 46 protrudes outside the case 25, and an operating knob is attached to this protrusion. A setting shaft gear 46 a that meshes with the final gear 43 of the reduction gear train is integrally formed on the setting shaft 46 .
b is integrally formed. The periodic cam 13 is rotatably fitted into this stepped portion 46b.
A time cam 12 is also integrally connected to the setting shaft 46 below the setting shaft gear 46a.
Furthermore, a continuous mode projection 47 is integrally provided below.

A continuous mode setting lever 48 is rotatably provided on a shaft 49 provided in the case 25.
The lever 48 can come into contact with the continuous mode projection 47.

A gear 44 integrally formed with the periodic cam 13 is engaged with the gear 38 .

On the circumferential surface of the time cam 12, a high step portion 12a and a middle step portion 12b are formed into two bottom portions 12c and 12, respectively.
It is bisected by c. On the other hand, seven lift portions 13a are formed on the circumferential surface of the periodic cam 13 at irregular intervals.

Inside the case 25 of the time switch 10, four switch contacts 14, 15, 16, and 17 are provided in a cantilevered manner. The tip of the switch contact piece 14 is bent to form a contact part 14a with the timer cam 12, and the middle part of the switch contact piece 14 is bent to form a contact part 14b with the switch contact piece 15. The tip of the switch contact piece 15 is bent to form a contact portion 15a with the switch contact piece 16. Contact pieces 16a and 1 are located near the tips of the switch pieces 16 and 17 and can come into contact with each other.
7a is fixed. The tip of the switch contact piece 17 is a push-back portion 17b, and a control piece 18 is interposed between the push-back portion 17b and the circumferential surface of the periodic operation cam 13. The control piece 18 is rotatably provided around a shaft 50 provided in the case 25, and has a periodic operation cam 1 on the side edge of the central portion in the longitudinal direction.
a contact part 18a that can come into contact with the lift part 13a of No. 3;
It has a push-back portion 18b that comes into contact with the push-back portion 17b of the contact piece 17.

The switch contact piece 15 comes into contact with the contact portion 14b of the switch contact piece 14 due to its elasticity, and the same contact piece 1
4 to press the contact portion 14a of the contact piece 14 against the circumferential surface of the timer cam 12. Contact piece 1 as shown in Figure 4.
In the state in which the contact portion 14a of No. 4 is in contact with the bottom portion 12c of the timer cam 12, each of the contact pieces 15, 16, 17
are spaced apart from each other.

Externally, the time switch 10 includes a power source 19, a fan motor 20 for rotationally driving the fan of the electric fan,
Oscillating motor 21 that performs the oscillating motion of the electric fan
There is. One end of each of the power supply 19, the fan motor 20, the swing motor 21, and the timer motor 11 are connected in common, the other end of the timer motor 11 is connected to the switch contact 14, and the other end of the swing motor 21 is connected to the switch contact. 15, the other end of the power source 19 is connected to the switch contact piece 16, and the other end of the fan motor 20 is connected to the switch contact piece 17, respectively. The fan motor 20 constitutes a load. The contact piece 17 together with the contact piece 16 connected to the power source 19 constitutes a load driving switch 62, and together with the contact piece 16, the contact piece 1
Reference numeral 5 constitutes an oscillating switch, and a contact piece 14 that can come into contact with a contact piece 16 through a contact piece 15 constitutes a timer switch 60 that is turned on and off by a time cam 12 together with the contact piece 16. are doing. These load drive switch 62, swing switch, and timer switch 60 are connected in parallel to the power source 19.

A regulating piece 51 that regulates the position of the contact piece 14 is provided protruding from the case 25 . This regulating piece 51 is for regulating the return position of the contact piece 14.
When the contact portion 14a of 4 falls into the bottom portion 12c of the timer cam 12, the contact piece 14 is received by a regulating piece 51 to suppress the generation of mechanical noise.

The contact piece 52 is connected to one terminal of the timer motor 11 and connects the power source 19 and the motor 11. The other end 14c of the contact piece 14 is connected to the other terminal of the motor 11. Case 25 has contact piece 1
A regulating portion 53 for regulating the return of the contact piece 17 is formed, and a regulating portion 54 for regulating the return of the contact piece 17 is also formed.

Load drive switch 62 consisting of contact pieces 16 and 17
is turned on and off as the periodic operation cam 13 rotates, and the switching of the switch 62 on and off is performed with the gears 38 and 44 being intermittently rotated. Relative positional relationship between and the periodic operation cam 13 and the periodic operation cam 13
The positional relationship of the plurality of lift sections 13a is set.

Next, the operation of the above embodiment will be explained.

5 and 7 show a so-called sleep mode, in which the timer cam 12 is rotated counterclockwise from the state shown in FIG.
4a is in contact with the middle portion 12b of the timer cam 12. In this state, the middle part 12b of the cam 12 pushes the contact part 14a of the contact piece 14, the contact part 14b of the contact piece 14 pushes the contact piece 15, and the contact part 15a of the contact piece 15 comes into contact. Contact piece 16. Further, the contact piece 16 is pushed by the contact piece 15 and is displaced toward the contact piece 17 side, and the contact piece 16 and the contact piece 1
7 can come into contact with each other. Due to the above-mentioned operation of each contact piece, the power supply 19, the contact piece 16, the contact piece 1
5, the circuit consisting of the contact piece 14 and the timer motor 11 is closed, and the timer motor 11 is driven to rotate.

The rotational driving force of the timer motor 11 is transmitted to a drive gear 27 via a gear 26 on its output shaft. As shown in FIG.
Due to the operation of the Geneva mechanism consisting of the drive pin 29 and the Geneva gear 31, the partially toothed gear 3 is activated together with the Geneva gear 31.
5 is intermittently driven to rotate. The intermittent rotation of the intermittent gear 35 causes the gear 36 to be intermittently rotationally driven, and the gear 38 and the intermittent teeth 39 that are integral with the gear 36 are also intermittently driven to rotate. Due to the rotation of the partially toothed gear 39, a reduction gear train consisting of gears 40, 41, 42, and 43 is intermittently driven to rotate, and the timer cam 12, which is substantially integrated with the setting shaft gear 46a that meshes with the gear 43, is rotated approximately once every few hours. The cam 12 is rotated counterclockwise in FIG. 1 at a speed of 1, and a timed operation is performed until the contact portion 14a of the contact piece 14 falls into the bottom portion 12c of the cam 12. At the same time, power supply 19, contact piece 16, contact piece 1
5. The circuit consisting of the swing motor 21 is closed, and the swing motor 21 performs the swing operation.

Further, the rotational force of the gear 38 is transferred to the intermittent rotating gear 44.
The gear 44 is intermittently driven to rotate, and the periodic cam 13 integrated with the gear 44 is intermittently driven to rotate counterclockwise at a speed of, for example, one revolution every two minutes. . As the cam 13 rotates, the contact portion 18a of the control piece 18 comes into contact with the lift portion 13a of the cam 13. When the contact portion 18a of the control piece 18 is in contact with the lift portion 13a, the contact piece 17
The push-back portion 17b is the push-back portion 1 of the control piece 18.
8b, the contact piece 17 is separated from the contact piece 16 as shown by the solid line in FIG.
When the abutting portion 18a of 8 is in contact with the valley between the lift portions 13a, the contact piece 17 is moved by its elasticity as shown in FIG. 7 and as shown by the chain line in FIG. As the contact piece 17a attempts to return to its original position, its contact piece 17a contacts the contact piece 16a of the contact piece 16. In this way, the contact pieces 16 and 17 constituting the load drive switch 62 are turned on and off alternately at relatively short intervals due to the rotation of the cam 13, and the fan motor 20 is alternately turned on and off at relatively short intervals. The fan is rotated intermittently to provide natural wind.

The above-mentioned contact piece 1 constituting the load driving switch 62
6, 17 and the contact piece 1 that constitutes the swing switch
5 and 16 are connected in parallel to the power source 19, the swing motor 21 is driven to rotate regardless of the intermittent rotation of the fan motor 20. This eliminates the unnaturalness in which the swinging motion stops every time the fan motor 20 is turned off.

The on time and off time when the fan is driven to rotate intermittently as described above are determined by the periodic operation cam 13.
It is determined by the width of the lift portions 13a in the circumferential direction, that is, the rotational direction of the cam 13, and the mutual spacing between the lift portions 13a. In the illustrated example, the intervals between the lifting head portions 13a of the cam 13 are formed irregularly, so that the off time of the fan becomes irregular.

Figure 9 shows the on/off operation of the load drive switch 62 as the periodic operation cam 13 rotates. The interval between the lift portions 13a of the cam 13 is set so that the time is 4 seconds. This is because it is unnatural for the fan motor 20 to turn on and off regularly or for a long time to remain off.

Further, as shown in FIG. 9, assuming that the periodic operation cam 13 and the intermittent rotation gear 44 integrated therewith rotate by four teeth per intermittent rotation, the load drive switch 62 is switched from on to off. The positional relationship of the lift portion 13a of the cam 13 and the gears 38, 44 and the cam are arranged so that the switching point from off to on and the switching point from off to on are performed within one intermittent rotation operation period of each of the four teeth. Thirteen relative positional relationships are set. This is to ensure that the switch 62 is turned on and off quickly within the period of intermittent rotation of the cam 13, thereby suppressing the occurrence of arcs between the switch contacts.

The number of teeth of the intermittent rotating gear 44 integral with the cam 13 is an integer multiple of the number of teeth of the gear 38 so that the timing of the on/off operation of the load driving switch 62 by the lift portion 13a does not deviate no matter how many times the cam 13 rotates.

Here, as a guideline for setting the off time during intermittent rotation of the fan, it is necessary to consider the inertial rotation time after the fan motor is de-energized. The inertia rotation time of a typical electric fan is about 10 seconds. Therefore, if the off time during intermittent rotation of the fan is set to around 10 seconds, even if the fan motor is turned off, the fan will rotate again before it completely stops, or the fan will stop. However, the downtime is short and the unnaturalness is eliminated.

Figure 10 shows an example of the on/off operation of the load drive switch during one rotation of the periodic operation cam, with the off time being unified to 6 seconds and the on time being an integral multiple of 6 seconds. It is something. Here, if the one rotation time of the partially toothed gear 35 is 6 seconds, the on/off switching point of the load drive switch 62 is positioned within the intermittent movement period within this 6 seconds with the above 6 seconds as a reference. The width of the lift portion 13a of the periodic cam 13 in the rotational direction is set. This allows the switch to be turned on and off quickly.

FIG. 11 shows an example in which the shape of the periodic operation cam 13 is changed to change the on/off switching pattern of the load drive switch. In this case as well, the lift portion 13a of the cam 13 is adjusted such that the on/off turning point of the load drive switch is located within the intermittent rotation drive period of the cam 13.
The width in the direction of rotation and the relative positional relationship of each rotating body are set.

Figure 12 shows another example of the on/off operation of the load drive switch during one rotation of the periodic operation cam.
It is shown according to Fig. 0, and when one rotation time of the partially toothed gear 35 is 6 seconds and this is used as the reference time,
By setting the period between the time of switching from on to off and the time of switching from next on to off to an integral multiple of 6 seconds, the timing of on and off switching is adjusted according to the same principle as in the case of Fig. 10. It is ivy.

In FIGS. 4 and 6, if the time contact knob of the timer is operated to rotate the time cam 12 clockwise, the contact piece 14 as shown in FIG.
The contact portion 14a of the contact portion 14a contacts the high step portion 12a of the timer cam 12, causing the contact piece 14 to be bent greatly, thereby forcing all the contact pieces 14, 15, 16, and 17 into contact with each other. It becomes normal timer mode,
The fan motor 20 is continuously driven to rotate, and the time cam 12 is driven by the reduction gear train 40, 41, 4.
2, 43, the contact piece 14 is rotated through the setting shaft gear 16a at a speed of about one rotation every few hours, for example.
The bottom part 12 of the timer cam 12 is located at the abutting part 14a of the
When c is reached, the fan motor 20 stops.

The continuous mode protrusion 47 is provided so as to overlap one bottom portion 12c of the timed cam 12. Therefore, when the setting shaft 46 is operated and the continuous mode setting lever 48 is rotated to a position where it is pushed by the continuous mode projection 47, the lever 48 comes into contact with the continuous mode setting lever 48, as shown in FIG. The piece 15 is forcibly pushed, the contact piece 15 and the contact pieces 16 and 17 are forced into contact, and the current supply circuit to the fan motor 20 and the swing motor 21 is closed. on the other hand,
The contact portion 14a of the contact piece 14 is connected to the bottom portion 1 of the timer cam 12.
2c, the contact piece 14 is separated from the contact piece 15, and the current supply circuit to the timer motor 11 is opened. Therefore, it becomes a continuous operation mode.

According to the embodiment described above, the periodic operation cam 13 for controlling the load drive switch on and off is provided in the intermittent rotation gear 38, and the switching of the load drive switch on and off by the cam 13 is performed by the gear 3.
Since the timing is set so that the operation is performed while the cam 8 is being rotated intermittently, the period of one rotation of the cam 13 is made sufficiently long, and the on/off period of the switch can be varied in various ways.
A more natural wind can be obtained, and the rotational speed of the cam 13 when the switch is turned on and off can be made sufficiently high to suppress the generation of arcs when the switch is turned on and off. Further, since the time cam 12 and the periodic cam 13 are arranged three-dimensionally overlapping each other on one axis, the time switch is miniaturized and requires less installation space. moreover,
Since the load drive switch 62 is arranged so that it can be moved to a position where it is turned on and off by the periodic operation cam 13 by the time setting operation of the time limit cam 12,
Only one switch is required to operate the load intermittently, reducing the number of parts and making it possible to downsize.
Costs are reduced and assembly workability is improved.

The on/off operation pattern of the load driving switch may be simpler or more complex than the patterns shown in FIGS. 9 to 12. The operation performed by the control piece 18 by the lift portion 13a of the periodic operation cam 13 is an operation for switching the load drive switch 62 from on to off in the illustrated example, but it is an operation for switching the switch 62 from off to on. You can. Further, the lift portion of the cam 13 for turning on and off the load drive switch 62 may be a concave portion instead of the protruding portion shown in the illustrated example.

The time switch according to the present invention can be applied not only to electric fans but also to various devices that turn on and off a load at relatively short intervals, such as washing machines having a reverse operation mode.

(Effect of the invention) According to the invention, the periodic operation cam is provided coaxially with the timer cam and rotated independently of the timer cam, and the load drive switch is controlled by the timer setting operation of the timer cam. On with periodic operation cam,
Because it is arranged so that it can be moved to the off position, only one switch is required to operate the load intermittently, reducing the number of parts and making it possible to downsize, reducing costs and improving assembly workability. do.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram schematically showing an embodiment of a time switch according to the present invention, Fig. 2 is a sectional view of the rotational force transmission mechanism from the timer motor to the time cam in the same embodiment, and Fig. 3 is a circuit diagram schematically showing an embodiment of the time switch according to the present invention. 4 is a circuit diagram showing a circuit example applicable to the present invention; FIG. 5 is a circuit diagram showing a different operating mode of the same circuit example; FIG. 6 is a circuit diagram showing a different operating mode of the above circuit example; A plan view of the embodiment, FIG. 7 is a plan view of the cam mechanism section in a different differential mode of the above embodiment, FIG. 8 is a plan view of the intermittent operation mechanism section in the above embodiment, and FIG. 9 is a plan view of the above embodiment. A timing chart showing the relationship between the intermittent rotation of the periodic operation cam and the operation timing of the load drive switch in an example, Fig. 10 is a timing chart showing an example of the on/off operation of the load drive switch, and Fig. 11 shows a different rhythm cam. A timing chart showing the shape and operation pattern of the load driving switch, FIG. 12 is a timing chart showing another example of on/off operation of the load driving switch, and FIG. 13 is a normal timer mode in the above embodiment. FIG. 14 is a plan view of the cam mechanism section showing the continuous mode in the above embodiment, and FIG. 15 is a circuit diagram schematically showing an example of a conventional time switch. 11...Motor, 12...Timed cam, 13...
Cyclic operation cam, 13a... lift section, 20... fan motor as load, 60... timer switch, 62... load drive switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A timer cam that is rotationally driven by a motor, a timer switch that is turned on and off by the timer cam, and a timer switch that has a plurality of lift parts and is coaxial with the timer cam. a periodic operation cam which is supported and rotated independently of the timer cam by the motor; and a periodic operation cam which is turned on and off by a plurality of lift sections of the periodic operation cam to periodically output an operation signal. and a load drive switch, wherein the load drive switch displaces the contact piece of the timer switch by the time limit setting operation of the time limit cam, so that the load drive switch operates at a plurality of lift portions of the periodic operation cam. A time switch characterized in that it is arranged so that it can be moved to a position where it is turned on or off.