JPH0425794Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a time switch that can be applied, for example, as a timer for a washing machine.

(Prior Art) For example, in a time switch that can be used as a timer for a washing machine, a buzzer switch is turned on to sound a buzzer immediately before the main switch is turned off after a set time limit has elapsed. To this end, the main cam that opens and closes the main switch and the buzzer cam that opens and closes the buzzer switch are provided with some play relative to the main shaft, and by making a difference in this play, the buzzer cam is rotated in advance. On the other hand, a switch for intermittently operating the water flow generation motor during the above timed operation and an intermittent cam for opening and closing this switch are provided. This intermittent cam is overlapped with the main cam and the buzzer cam, and is driven to rotate at a higher speed than the main cam and the buzzer cam in the same direction as the main cam and the buzzer cam.

(Problems to be Solved by the Invention) According to the above-mentioned conventional time switch, the intermittent cam stacked with the main cam and the buzzer cam is rotated at high speed in the same direction as the main cam and the buzzer cam. There was a problem that the buzzer's ringing operation or timed operation became unstable because the intermittent cam tried to rotate within the range of play between the buzzer and the intermittent cam.

The present invention was made to solve these conventional problems, and is a time switch that eliminates the instability of the buzzer's ringing operation or timed operation by preventing the main cam and buzzer cam from being dragged by the intermittent cam. The purpose is to provide

(Means for Solving the Problems) The present invention includes a first cam to which rotational force is transmitted from a drive source via a transmission mechanism, and a gear to which the rotational force from the transmission mechanism is further reduced in speed and transmitted. and a second cam that is rotatable integrally with the gear, and the first cam and the second cam are stacked so as to be rotatable independently of each other, and the directions of rotation are opposite to each other. characterized by something.

(Operation) The first cam and the second cam are rotationally driven independently of each other. The first cam is driven to rotate at a faster speed than the second cam. Since the first cam and the second cam rotate in opposite directions, the second cam is not dragged by the first cam and rotates.

(Example) Hereinafter, an example in which a time switch according to the present invention is applied to a timer for a washing machine will be described with reference to the drawings.

In FIGS. 1 and 2, the lower case 10
, the base plate 11 placed on top of this, and these cases 1
0 and a cover 12 placed over the open end of the main plate 11 constitute a casing of the timer. Main plate 11
The main shaft 15 is loosely fitted into the shaft hole 111 formed in the case 10, and a protrusion 151 at the lower end of the main shaft 15 is rotatably supported by the shaft hole 102 of the tube shaft portion 101 formed in the case 10. A knob for setting the time is attached to the main shaft 15 that projects outward from the main plate 11. A gear shaft 13 is supported by a boss portion 103 of the case 10 and a boss portion 112 of the base plate 11, and a gear shaft 14 is supported by a shaft hole 113 of the case 10 and the base plate 11.

A main gear 16 is fixed to the main shaft 15 by press fitting. As shown in FIGS. 5 and 6, the main gear 16 includes a large-diameter gear portion 161 and a cylindrical portion 162 formed on the lower surface thereof, and a thrust regulating surface 164 around the base of the cylindrical portion 162. is formed,
In addition, a protrusion 1 is provided on the outer peripheral side of the cylindrical portion 162 in the axial direction.
63 are integrally formed.

The buzzer cam 17 is rotatably fitted to the outer circumferential side of the cylindrical portion 162 of the main gear 16, and the main cam 18 is rotatably fitted from below. As shown in FIGS. 7 to 9, the buzzer cam 17 has a fitting hole 174 that fits into the cylindrical portion 162 of the main gear 16, and an engagement recess 171 formed by cutting out a part of the fitting hole 174. In addition, a high step portion 172 is provided on the outer circumferential side along a circle concentric with the fitting hole 174.
It has a cam surface consisting of a low step portion 173, and a pair of partially arcuate jetties 175 on the lower surface side. On the other hand, as shown in FIG. 10 and FIG.
84, an arc-shaped guide wall 188 along the outer periphery of the cylindrical portion 162 of the main gear 16, and an engagement recess 181 formed by cutting out a part of the guide wall 188, and a groove concentric with the guide wall 188 on the outer periphery side. It has a cam surface consisting of a high step part 182 and a low step part 183 along a circle, and further has a pair of arc-shaped recesses 185 on the top side and a cylindrical part 186 on the bottom side. .

When the buzzer cam 17 and the main cam 18 are overlapped, the pair of jetties 175 of the buzzer cam 17 fit into the pair of recesses 185 of the main cam 18, and in this state, the jetties 175 and the recesses 185 are arranged so that both cams 17 and 18 can rotate relative to each other. There is circumferential play between the two. In addition, the cams 17, 1
8 are overlapped, the engagement recesses 171 and 181 of both sides overlap, and the protrusion 163 of the main gear 16 is loosely fitted into these engagement recesses 171 and 181. 28th
As shown in FIG. 29, one engagement recess 171
has a narrower width in the circumferential direction than the other engagement recess 181, and when the main gear 16 is rotated, the protrusion 163 pushes the end of the engagement recess 171 first,
The low step portion 173 on the cam 17 side is placed ahead of the low step portion 183 on the cam 18 side in the rotation direction.

A cam gear 19 is rotatably fitted on the outer peripheral side of the tube shaft portion 101 of the case 10. As shown in FIGS. 12 to 14, the cam gear 19 has a first intermittent cam portion 191, a second intermittent cam portion 192, a gear portion 193, and a third intermittent cam portion 1 on the outer periphery in order from the top.
94, and has a cylindrical portion 195 along the central axis. On the inner circumferential side of this cylindrical portion 195 is a shaft hole 19 that loosely fits into the upper and lower end portions of the tube shaft portion 101.
6,198 are formed, and a thrust receiver 197 is formed above the shaft hole 196. The main shaft 15 is received by the thrust receiver 197, and the upper end of the cylindrical portion 195 is connected to the cylindrical portion 1 of the main cam 18.
The cylindrical portion 195 is loosely fitted into the inner peripheral side of the cylindrical portion 195 to guide the rotation of the cam 18, and the upper end of the cylindrical portion 195 serves as a thrust receiver for the cam 18. The first intermittent cam portion 191
The and second intermittent cam portions 192 have the same number of unevenness and the same width in the circumferential direction, and the relationship between the unevenness is reversed to overlap in a staggered manner. In addition, the third
The intermittent cam portion 194 includes the first and second intermittent cam portions 19
It is made up of twice as many irregularities as the number of irregularities (1,192). When assembling, cam gear 19, main cam 1
8 and the buzzer cam 17 are stacked in this order, and the main shaft 15 integrally having the main gear 16 is dropped from above.

Note that in the claims for utility model registration, the first cam refers to the cam gear 19, and the second cam refers to the main cam 18.

A rotor pinion 20 of a timer motor is supported on the lower side of the case 10. A large-diameter gear 21 and a small-diameter gear 22 integrated therewith are rotatably fitted onto the gear shaft 14, and a large-diameter gear 25 and a small-diameter gear 26 integrated therewith are rotatably fitted onto the gear shaft 14. A gear 30 is rotatably fitted therein. A large-diameter gear 29 is rotatably fitted on the outer peripheral side of the gear 30 via a friction transmission mechanism, which will be described later. On the other hand, a large-diameter gear 23 and a small-diameter gear 24 integrated therewith are rotatably fitted into the gear shaft 13, and a large-diameter gear 27 and a small-diameter gear 28 integrated therewith are rotatably fitted onto the gear shaft 13. . The rotational force of the rotor pinion 20 is transmitted through deceleration transmission mechanisms 21, 22, 23, 24, 25, 26,
27 to the cam gear 19, and
The rotational force from the transmission mechanism is transmitted to the gear train 28, 29,
The speed is further reduced by 30 and transmitted to the main gear 16.

As shown in FIG. 18, the gear 30 includes a cylindrical portion 304 that is long in the axial direction, a flange portion 302 formed at an intermediate portion of the cylindrical portion 304, and a friction surface 305 on the outer peripheral surface of the lower end of the cylindrical portion 304. and shaft hole 30
1. The cylindrical portion 3 of this gear 30
04 is fitted into the shaft hole 292 of the gear 29 so as to be relatively rotatable. As shown in FIGS. 15 to 17, the gear 29 includes the shaft hole 292, a cylindrical portion 290 formed outside the shaft hole 292, and a lower half portion of the cylindrical portion 290 divided into three parts each having elasticity in the radial direction. a friction surface 299 on the inner periphery of the lower half of the cylindrical portion 290, three grooves 294 formed along concentric arcs on the outside of the cylindrical portion 290, and further formed on the outside thereof. Three arcuate grooves 29
3, a bridge portion 295 left between these grooves 294 and 293, a hook portion 296 formed on these bridge portions 295, and a gear portion 291 formed on the outermost side. A slope 297 is formed on the hook portion 296.

The cylindrical portion 3 of the gear 30 is inserted into the shaft hole 292 of the gear 29.
04 is fitted, and the flange part 302 of the gear 30 becomes embedded in the gear 29, and the flange part 302 pushes the slope 297 of the hook part 296, bending the hook part 296 and the bridge part 295, until they reach a predetermined position. Hook portion 296 when fitted
is engaged with the flange portion 302 and the gears 29, 3
0 are mutually prevented from coming off. With the gears 29 and 30 fitted together in this way, the gear 2
9 and 30 can freely rotate relative to each other. but,
Gear 2 with gears 29 and 30 fitted together
A compressible coil spring 76 is fitted from the outer circumferential side of the cylindrical portion 290 of No.
A frictional force is applied to the gears 29 and 30, and rotational force is transmitted between the gears 29 and 30 within this frictional force.

Each cam 17, 18, 191, 1 mentioned so far
92 and 194, a switch element consisting of a plurality of contact plates, which will be described below, is disposed opposite to each other. In FIGS. 1 to 4, the contact plates 32, 46, and 61 constitute one switch element that is driven by the cams 17 and 18 to connect and release, and the contact plates 33, 47, and 62 are driven by the cam part 191. The contact plates 34, 48, and 63 constitute another switch element that is driven by the cam portion 192,
The contact plates 49 and 64 constitute another switch element that is brought into contact and separated by being driven by the cam portion 194 via the driven lever 75.

Among the above contact plates, the contact plates 32, 33, 34 constitute one contact assembly 31, and the contact plates 46, 4
7, 48, 49 constitute another contact assembly 45,
The contact plates 61, 62, 63, and 64 constitute yet another contact assembly 60. These contact assemblies 31, 45, and 60 are integrally molded from an elastic thin metal plate, and connect the plurality of strip-shaped contact plates and the contact plates with each other, and can also be connected later as necessary. and a connecting portion that can be cut.

Figures 19 and 20 show contact plates 32, 33, 34.
A contact assembly 31 is shown. Contact plate 3
2, 33, 34 connect two parts of the base to connecting parts 39, 4
It is integrally molded as a contact assembly connected at 0, 41, and 42, and a contact base 35 is insert-molded of insulating resin or the like across each contact plate between the two connecting parts. There is. Contact base 3
5 has insulating parts 351, 352, 353 extending integrally to the lead connection parts 321, 331, 341 at the base of each contact plate 32, 33, 34, and has engagement grooves 36, 37 at the upper and lower ends. In addition, the longitudinal recess 354 on the side surface and the cylindrical engagement recess 38
has. The tip of the contact plate 32 is bent in a right angle direction, and a follower 43 made of an insulating material is fixed near the tip.

Figures 21 and 22 show contact plates 46, 47, 4.
8, 49 is shown. The contact plates 46, 47, 48, 49 are integrally molded in such a way that two parts of the base are connected by connecting parts 51, 52, 53, 54, 55, 56, and the contact base crosses each contact plate between these connecting parts. 50 is insert molded. The contact base 50 includes insulating parts 505, 506, 507, which extend integrally toward the lead connection parts 461, 471, 481, 491 at the base of each contact plate.
508 and engagement grooves 501 at the upper and lower ends.
502, and cylindrical engagement protrusions 503, 504 and a protrusion 509 on both sides. Followers 57 and 58 are fixed near the tips of the contact plates 47 and 48, respectively.

Figures 23 and 24 show contact plates 61, 62, 6.
3, 64 is shown. The contact plates 61 , 62 , 63 , 64 connect the two parts of the base with connecting parts 66 , 67 , 68 , 69 , 70 , 71 , and the positions near the tips of the contact plates 62 , 63 , 64 connect with the connecting parts 86 , 87 . A contact base 65 is insert-molded to cross each contact plate between the two connecting portions of the base. The contact base 65 has engagement grooves 65 at the upper and lower ends.
1,652 and a concave portion 65 in the longitudinal direction.
3, and has a cylindrical engagement recess 654 within this recess 653. The contact base 65 has a protrusion 655 that extends in the direction of the contact plate 63 and then extends in the right angle direction, and also has an insulating tongue part 656 that extends in the direction of the contact plate 64 and then extends in the right angle direction. Contact plate 61
Since the other contact plates 62, 63, and 64 do not need to be displaced, their tips are connected by a contact plate holder 72 formed by insert molding of an insulating resin. Protrusions 721, 722, 723 are integrally formed on the contact plate holder 72 at positions corresponding to the respective contact plates 61, 62, 63, 64.

As shown in FIGS. 1 to 4, there is a contact assembly having contact plates 32, 33, 34, a contact assembly having contact plates 46, 47, 48, 49, and contact plates 61, 62. , 63, 64 are stacked in this order, and the contact plates 61, 62,
63, 64 are each cam 18, 191, 192, 19
Arranged on 4 sides. Each contact assembly has an engaging recess 38, 6 in its contact base 35, 50, 65.
54 and the engaging protrusions 503, 504 are mutually fitted to overlap each other. Misalignment of the contact assembly is prevented. The upper and lower engagement grooves 36, 501 of each superimposed contact base 35, 50, 65,
651, 37, 502, and 652 are aligned in a straight line, and each contact base is positioned at a predetermined position by fitting the protruding piece 114 of the base plate 11 and the protruding piece 110 of the case 10 into these engagement grooves.

When each contact base is positioned, the protrusion 655 of the contact base 65 is positioned above the shaft support of the driven lever 75 to prevent the lever 75 from coming off. Also,
The contact plate holder 72 is in contact with the guide walls 104 and 116 of the case 10 and the base plate 11. Contact plate 32
The follower 43 of the contact plate 61 is in sliding contact with the cam surface of the buzzer cam 17, the follower 73 of the contact plate 61 is in sliding contact with the cam surface of the main cam 18, and the follower 57 of the contact plate 47 is in sliding contact with the first intermittent cam portion 191 of the cam gear 19. The follower 58 of the contact plate 48 is in sliding contact with the second intermittent cam portion 192 of the cam gear 19, and the contact plate 49 is in sliding contact with the driven lever 7.
It is in contact with the tip protrusion 751 of No. 5.

FIG. 25 shows a connection example of a timer having each of the contact plates described above. A chain line frame 90 indicates a timer, and includes a timer motor 91. This motor 91
A rotor pinion 20 (see FIG. 1) is provided on the output shaft of the rotor. When the main switch S5 composed of the contact plates 46 and 61 is on, the timer motor 9
A power source 92 is supplied to the buzzer 93 when the buzzer switch S1 composed of the contact plates 46 and 32 is on. When the switch S5 is on and the intermittent switch S4 made up of the contact plates 49 and 64 or the water flow changeover switch S6 connected in parallel to it is on, the water flow generation motor 94 is in a state where power can be supplied. Intermittent switch S2 consisting of contact plates 62 and 47 or intermittent switch S3 consisting of contact plates 63 and 48
When turned on, power is supplied to the motor 94.
The direction of rotation of the motor 94 when the intermittent switch S3 is on is opposite to the direction of rotation of the motor 94 when the intermittent switch S2 is on.

As is clear from FIG. 25, of the contact plates 33 and 34 are not used. In addition, contact plates 62, 6 belonging to one contact aggregate
3 and 64 are short-circuited, so the connecting portion 67, which connects these contact plates,
68, 70, 71, 86, and 87 are left uncut, and only the connecting portions connecting the other contact plates are cut.

In FIGS. 2 and 26, reference numeral 78 indicates a lead wire connected to each contact plate. The case 10 has a guide wall 10 for guiding the lead wire 78.
5, 106, 107, 108, 109 are formed, and four lead wires 78, two lead wires are connected between these guide walls.
Lead storage section 8 that stores books, two books, and one book separately.
1, 82, 83, and 84 are formed. A side wall 122 of the cover 12 covers these lead storage parts. In the circuit example of FIG. 25, the number of lead wires drawn out to the outside of the timer is seven, so it is sufficient to use one of the lead storage sections 81 and 84 and the lead storage sections 82 and 83. As shown in FIG.
24 to the lead storage section, and after passing through the lead storage section from top to bottom, it is pulled out of the timer.

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

When the timer is in a stopped state, the followers 43 and 73 move toward the lower portions 17 of the cams 17 and 18, as shown in FIG. 27d.
3,183, the position of the tip of the contact plate 46 is regulated by the protruding piece 721 of the contact plate holder 72, and the contact plates 32, 46, 61 are separated, and the switch S
1.S5 is off and timer motor 92 is also buzzer 93
is not working either. From this state, move the main shaft 15 to the second
In the figure, it is assumed that an arbitrary time limit is set by rotating counterclockwise. The main gear 16 integrated with the main shaft 15 is also rotated counterclockwise, and its protrusion 163 causes the buzzer cam 17 and main cam 18 to rotate counterclockwise. Here, since the engagement recess 171 of the cam 17 with which the protrusion 163 engages has a width smaller in the circumferential direction than the engagement recess 181 of the cam 18,
The cam 17 is rotated before the cam 18, and after the follower 43 is pushed out from the low step portion 173 of the cam 17, the follower 73 is pushed out from the low step portion 183 of the cam 18. Therefore, the contact plate 61 is the same as the contact plate 4.
6 and bends the contact plate 46, since the contact plate 32 has already escaped from the contact plate 46, the contact plates 32 and 46 will not come into contact, while the contact plates 46 and 61 will come into contact. Then, power is supplied to the timer motor 91. The rotational force of the main shaft 15 is transmitted from the main gear 16 to the gear 30, and between the gear 30 and the gear 29 there is a friction transmission mechanism having a spring 76, etc., as explained with reference to FIGS. 15 to 18. Therefore, the rotational force from the main shaft 15 side is not transmitted to the gear train below the gear 29.

By supplying power to the timer motor 91, the motor 91
rotates, and the rotational force is transmitted to the transmission mechanisms 20, 21, 2
2, 23, 24, 26, 27, gear 2
7 is transmitted to the gear portion 193 of the cam gear 19 as the first cam, and the cam gear 19 is rotated, for example.
It is rotated at a speed of about 2 rpm. Further, the rotational force of the gear 27 is transmitted to the gear 29 via the gear 28, to the gear 30 via the friction transmission mechanism, and further to the main gear 16. gear 2
The transmission mechanism consisting of 8, 29, 30, and 16 constitutes a speed reduction mechanism, and the main gear 16 moves clockwise in FIG. Rotationally driven. As the main gear 16 rotates, its protrusion 163 pushes the cams 17 and 18 clockwise. At this time, as described above, the engaging recesses 171, 1 of the cams 17, 18
Since there is a difference in the circumferential width of 81, Fig. 27b,
As shown in FIG. 28, the cam 17 is rotated clockwise first. In this way cams 17, 18
When the cam 17 returns to near its original position, the follower 43 first falls into the low step 173 of the cam 17 and the contact plates 32 and 46 come into contact, as shown in FIG. Then, power is supplied to the buzzer 93 and the buzzer 93 sounds. Next, the low step portion 18 of the cam 18 rotates slightly behind the cam 17.
3, the follower 73 falls down, and the contact plate 61 separates from the contact plate 46, as shown in FIG.
6 is returned to its original position, and the contact plate 46 is separated from the contact plate 32. At this point, the buzzer 93 stops sounding and the timer motor 92 is stopped, thereby completing the timed operation.

On the other hand, due to the rotational drive of the cam gear 19, the first intermittent cam portion 191 and the second intermittent cam portion 192 are
Contact plate 4 via followers 57 and 58 that are in sliding contact with
7 and 48 are controlled, and the switch S2 consisting of the contact plates 47 and 62 is turned on and off and the contact plates 48 and 6 are controlled.
The on/off of the switch S3 consisting of 3 is controlled. The first intermittent cam portion 191 and the second intermittent cam portion 192 have a high step portion and a low step portion at regular intervals in the circumferential direction,
In addition, since the high-step portions and low-step portions of both cam portions 191 and 192 are formed in a staggered manner, as shown in FIG.
3 ON-OFF-SWITCH S2 ON... It operates like this. Therefore, if the water flow selector switch S6 is turned on, the water flow generation motor 94 will rotate in the normal direction according to the operating cycle of the switches S2 and S3.
It operates in the following order: OFF - Reverse rotation - OFF - Forward rotation...

Also, by rotationally driving the cam gear 19, the third
The intermittent cam portion 194 rotates. This cam portion 194
are the first intermittent cam portion 192 and the second intermittent cam portion 1
92 and at the same position in the circumferential direction as each of the cam parts 191 and 192, the driven lever 75 As shown in FIG. 30, the switch S4, which is made up of the contact plate 49 and the contact plate 64, which are driven by , works off. Therefore, the water flow selector switch S
6 is turned off, the water flow generation motor 94
repeats the operation of forward rotation-off-reverse rotation-off-forward rotation at half the cycle of the above-mentioned operation cycle.

The operation of the motor 94 described above is stopped when the main switch S5 is turned off.

According to the embodiment of the time switch according to the present invention described above, of the cam gear 19 and the main cam 18 which overlap each other so as to be able to rotate independently, the cam gear 19 is rotationally driven at a relatively high speed via the transmission mechanism, and the main cam 18 is rotated in the opposite direction to the cam gear 19 and at a lower speed than the cam gear 19 by transmitting the rotational force from the transmission mechanism at a further reduced speed. Therefore, main cam 1
Due to the sliding contact between the main cam 8 and the cam gear 19, a load is always applied to the main cam 18 in the direction opposite to its rotating direction during timed operation, so that the main cam 18 does not lead the main gear 16 by the amount of play. , it is possible to eliminate the inconvenience that a timed operation is performed earlier than the set time limit.

Note that the time switch of the present invention can be applied to timers other than timers for washing machines.

(Effects of the invention) According to the invention, of the first cam and the second cam that overlap each other so as to be rotatable independently, the first cam is rotationally driven at a relatively high speed via the transmission mechanism, and the second cam is rotationally driven at a relatively high speed via the transmission mechanism. The cam is rotated in the opposite direction to the first cam and at a lower speed than the first cam by transmitting the rotational force from the transmission mechanism at a further reduced speed. Therefore, due to the sliding contact between the second cam and the first cam, during timed operation, a load is always applied to the second cam in the opposite direction to its rotational direction, so that the second cam takes the lead. Therefore, it is possible to eliminate the inconvenience that a timed operation is performed earlier than the set time limit.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the time switch according to the present invention, Fig. 2 is a plan view of the same embodiment with the upper base plate removed, and Fig. 3 is a contact plate portion of the above embodiment. 4 is a front sectional view of the contact plate portion of the above, FIG. 5 is a bottom view of the main gear in the above embodiment, FIG. 6 is a longitudinal sectional view of the main gear of the above, and FIG. 8 is a top bottom view of the buzzer cam in the above embodiment, FIG. 9 is a longitudinal sectional view of the same, FIG. 10 is a plan view of the main cam in the above embodiment, and FIG. 2 is a plan view of the cam gear in the above embodiment, FIG. 13 is a longitudinal sectional view of the same, FIG. 14 is a top bottom view of the same, and FIG. FIG. 16 is a top and bottom view of the gear, FIG. 17 is a vertical cross-sectional view of the same, FIG. 18 is a vertical cross-sectional view of another gear in the above embodiment, and FIG. 19 is a top and bottom view of the same. FIG. 20 is a side view showing one contact assembly, FIG. 20 is a top bottom view of the same, FIG. 21 is a side view showing another contact assembly in the above embodiment, FIG. 22 is a top bottom view of the same, and FIG. 23 is a top bottom view of the same. FIG. 24 is a side view showing still another contact assembly in the embodiment, FIG. 24 is a top bottom view of the same, FIG. 25 is a circuit diagram showing an example of connection of the contact plate in the above embodiment, and FIG. 27 is a plan view showing the operation of the main switch and buzzer switch in the above embodiment; FIG. 28 is a plan view showing the operation of the buzzer cam and main cam in the above embodiment; FIG. 29 is a plan view showing another mode of operation of the same cam, and FIG. 30 is a timing chart showing the operation of the switch contact by the intermittent cam in the above embodiment. 16...Gear, 18...Second cam, 19...
First cam, 20, 21, 22, 23, 24, 2
5, 26, 27...transmission mechanism, 91...timer motor as a drive source.

Claims (1)

[Scope of utility model registration request] A first cam to which rotational force is transmitted from a drive source via a transmission mechanism, a gear to which the rotational force from the transmission mechanism is further reduced in speed and transmitted, and a second cam that is rotatable integrally with the gear. A time switch characterized in that the first cam and the second cam are stacked so as to be rotatable independently of each other, and the directions of rotation are opposite to each other.