JPH09147713A - Time switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items, improve the balance of the elastic contact force of a contact point board to a cam, and improve manufacturing efficiency. SOLUTION: This time switch is provided with a cam 6 rotatively driven by a drive source and contact point boards turned on or off after cam faces formed on the cam 6. Two pairs of contact points 13, 14 driven and controlled by the cam 6 are provided on a common holding member 42, two pairs of contact points 13, 14 are arranged face to face across the cam 6 while individual contact point boards of two pairs of contact points 13, 14 are position-regulated by position regulation sections 26, 27 respectively, and two position regulation sections 26, 27 are made different in height.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time switch having a cam rotatably driven by a drive source such as a full-scale dancer, and a contact plate which is turned on and off following a cam surface formed on the cam.

[0002]

2. Description of the Related Art Conventionally, in the field of a time switch that operates with a drive source such as Zenmai, one in which two contact groups are controlled by a cam is known. For example, since a time switch used in a washing machine is often used in a high humidity place such as a bathroom or outdoors, it has a two-wire disconnection structure to prevent a short circuit due to an electric leakage. A time switch called this 2-line disconnect timer is disclosed in Japanese Patent Laid-Open No. 151151/1989.
As shown in Japanese Patent No. 124, a main switch driven by a time switch is provided on both sides of a water flow generating motor. The outline of this technique is shown in FIG. That is, as shown in FIG. 13, when power is supplied from the power plug 80 to the water flow generating motor 81, the main switch 82, which is composed of one time switch on both sides,
83 is provided. Then, the contact pieces of the main switches 82 and 83 perform the same contact and separation operations, and are turned on and off at the same time.

As a result, when only one of the main switches 82 is present, there is a risk that the water flow generating motor 81 will rotate even if the main switch 82 is cut off, while the motor 81 will rotate. This method of cutting on both sides or two lines eliminates such a risk. In this technique, between the water flow generating motor 81 and the main switch 83, a forward / reverse switch 84 for normally rotating and reversing the water flow generating motor 81 and a buzzer switch 85 are provided. There is.

Such a two-wire cut timer has a structure in which, as shown in Japanese Patent Laid-Open No. 1-1151124, four contact pieces arranged horizontally, that is, two contact sets are integrated to form a switch body, and the cam irregularities are formed. The surface is made to follow by one actuator provided on the switch body. Then, the movement of the actuator is transmitted to the other switch set by using the slide lever to perform switch control. In addition to such a slide lever utilizing method, there is also a configuration in which a switch body is formed by stacking two contact sets, and two contact pieces of the switch body are operated by levers or the like to control the switch.

[0005]

However, the conventional time switch requires separate parts for the slider and the lever. Moreover, in the case of using the slide lever as disclosed in JP-A-1-151124, since the elastic force of the four contact pieces is applied to the cam from one direction,
Problems such as wear of the cam surface and actuator and eccentricity of the cam are likely to occur. Further, in the structure in which the contact point group is stacked, the mold of the switch body is complicated, the precision of the parts is likely to be deteriorated, and the cost is increased. In addition, the space in the height direction becomes large, which is not preferable for downsizing.

In order to deal with these problems, the switch body is divided into two pieces, two contact pieces form one switch body, and the two switch bodies are arranged on both sides of the cam or in a stack. Can also be considered. However, such a structure increases the number of parts, lowers manufacturing efficiency, and raises costs.

The present invention can reduce the number of parts and
An object of the present invention is to provide a time switch in which the contact force of the contact plate with the cam can be balanced and the manufacturing efficiency is good.

[0008]

In order to achieve the above object, in the invention described in claim 1, a cam which is rotationally driven by a drive source and a contact plate which is turned on and off by following a cam surface formed on the cam. In the time switch including the above, the two contact sets controlled by the cam are provided on the common holding member, and the two contact sets are arranged such that one contact plate of each of the contact sets is a position regulating portion. Are arranged so as to face each other with the cam interposed therebetween in a state in which the position is regulated by, and the heights of the two position regulating portions are made different.

Further, according to the invention described in claim 2, according to claim 1,
In the time switch described above, the cam is provided with two cam surfaces having the same on-state and off-state modes, respectively, and two contact groups are respectively brought into contact with the two cam surfaces for follow-up control. There is.

Further, in the invention as set forth in claim 3, in the time switch according to claim 2, the two contact sets are formed on the same plane, and the cam surfaces which are in the same mode are in the cam height direction and the circumferential direction. By shifting the heights of the actuator parts that are pressed against the cam surfaces of the two contact sets, one of the actuator parts is brought into contact with one of the cam surfaces formed side by side in the height direction. The other side of the actuator portion is in contact with the other side.

In addition, in the invention as set forth in claim 4, in the time switch according to claim 3, the position restricting portion is formed by integral molding with a case body forming a case of the time switch.

In the time switch of the present invention, the cam is rotationally driven by a drive source such as a full-scale dancer. Then, the contact plate is driven by the cam surface of this cam to turn on and off. Two sets of contacts having such a contact plate are provided, and the two sets of contacts are provided on a common holding member and are integrated. Then, the tip is arranged so as to sandwich the cam. Therefore, the elastic force of the contact plate is applied to the cam substantially equally from both sides by the force of one set.

When assembling the two integrated contact sets into the time switch body, first, one contact plate of the contact set disposed on the side of the position regulating portion having a high height is moved by the position regulating portion. Installation is blocked. At that time, the contact plate is bent, and the contact plate is released from the high position restricting portion to proceed with the assembling. Then, next, one of the contact plates of the contact set disposed on the side of the position regulating portion having the lower height is prevented from being assembled again by the lower position regulating portion. Also at this time, by bending the contact plate, the contact plate is released from the low position regulating portion, and the assembly is completed and completed. In this way, since the heights of the two position restricting portions are different, when the integrated contact set is assembled, the contact plates can be released in order, which facilitates the assembly.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. The time switch of this embodiment is used for dehydrating a two-tub type washing machine.

The time switch 1 includes a first case 2 which constitutes one of the case bodies, a second case 3 which constitutes the other of the case bodies and which fits into the first case 2, and a space within the second case 3. The full-length dance 4 to be put in, the main shaft 5 that locks one end of the full-length dance 4 and winds up the full-length dance 4, the cam 6 that rotates with the rotation of the main shaft 5, and the cam 6 that abuts on and off. Switch body 7 that operates and gear 8 that is provided on main shaft 5
It mainly consists of a gear train 9 that meshes with the pendulum 9a to transmit the rotation of the main shaft 5. The case body constitutes the case of the time switch 1.

As shown in FIG. 5, the first case 2 has a switch body insertion portion 10 into which the switch body 7 is fitted and held, a main body portion 11 in which the cam 6 and the gear train 9 are incorporated, and the time switch. Two attachment parts 12 for attaching 1 to the washing machine side are provided.

The switch insertion portion 10 has two contact sets 1
A T-shaped partition wall portion 15 for partitioning 3, 14 and an application regulating portion 16 having both the function of this partition and the function of regulating the amount of grease applied to the cam 6, the partition wall portion 15 and the application regulation. A cutout portion 17 for mounting the switch body 7 provided between the switch body 7 and the portion 16, and a wall portion 15 for partitioning, which surrounds the switch body 7 in a U-shaped cross-section, protruding from the outer periphery of the circular first case 2. Two external connector insertion parts 18,
A protruding portion 19 forming 18 and two holding shafts 10a, 10a through which the switch body 7 is inserted are provided.

The main body 11 is provided with a through hole 20 through which the main shaft 5 penetrates in the center thereof and an engaging recess 21 of the cam 6 around the through hole 20. Then, shaft support portions 23, 24, 25, 26 for holding the four shafts 22 for supporting the gear train 9 are arranged in a circumferential shape. Here, the shaft support portion 26 that supports the pendulum 9a, which is the final portion of the gear train 9, also serves as a high position regulating portion when the switch body 7 described later is incorporated. The body portion 11 further includes an engaging recess 21.
A restriction protrusion 27 having an oval cross section is provided at a symmetrical position with respect to the shaft support portion 26 with the height of the shaft support portion 26 as a position control portion. Further, a plurality of screw holes 29 into which screws 28 for attaching the second case 3 are assembled and a lid switch lever 30 are provided on the outer peripheral portion of the main body 11.
Is provided with a lever mounting shaft 31.

The mounting portions 12 are provided with mounting holes 32, respectively, and the corners 12b on the surface opposite to the mounting surface 12a are chamfered to form a circular shape. In addition,
The above-mentioned members and portions provided in the first case 2 are
All are integrally formed by molding with a resin material.

In the second case 3, a storage portion 33 for storing the whole dance 4, a protruding portion 34 for pressing the switch body 7,
A plurality of screw holes 35 for mounting the screws 28 are provided. The partition wall 15 is provided at the center of the protrusion 34.
Is provided with a fitting groove 34a. It should be noted that each member and each portion provided in the second case 3 are also formed by integral molding of a resin material.

One end of the whole dance is locked in the engaging hole of the second case 3, and the other end is locked by the protrusion 5a of the main shaft 5 so that the main shaft 5 can wind it up.

In addition to the gear 8 mounted on the main shaft 5 via a leaf spring for preventing overload, as shown in FIG. 3, a knob engaging pin 36 with which a knob (not shown) is engaged, 1 Regulating pin 37 that engages with pin engaging portion 2a of case 2 and regulates rotation of main shaft 5, and cam engaging pin 3 with which cam 6 engages
And 8 are provided.

The switch body 7 includes two contact sets 13 and 14
And a terminal portion 41 protruding from the first case 2 to the outside, and a common holding member 42 for holding the contact sets 13 and 14 and the terminal portion 41. Here, the contact set 13 includes an inner contact plate 44 having an actuator portion 43 that contacts the cam 6, and an outer contact plate 45 that contacts and separates from the contact plate 44.
It is composed of On the other hand, the contact set 14 includes an inner contact plate 4 having an actuator portion 46 that abuts on the cam 6.
7 and a contact part 48 for contacting / separating the operating part 30a of the lid switch lever 30, and a contact plate 49 for contacting / separating the contact plate 47.
It is composed of In addition, each actuator unit 43, 4
6 uses nylon 6T or polyacetal (POM) as a material, and is attached to each contact plate 44, 47 by insert molding.

The terminal portion 42 has a terminal 50 connected to the contact plate 44, a terminal 51 connected to the contact plate 45, a terminal 52 connected to the contact plate 47, and a terminal 53 connected to the contact plate 49. It consists of and.

The holding member 42 includes the contact plates 44, 45, 4
7, 49 and each of the terminals 50, 51, 52, 53 are integrally molded with 6T nylon, and the actuator parts 43, 46 are insert-molded at the same time. Then, the holding member 42 is fitted and held in the switch body insertion portion 10 of the first case 2. Further, the holding shafts 10a, 10a are inserted into the holding member 42 from the lower side of the holding member 42, while the two cylindrical projections 34a, 34a of the projecting portion 34 of the second case 3 are fitted from the upper side. Two through holes 42a, 42a are formed. The fitting and holding is performed in a state where both sides of the switch body 7 are in contact with the first case 2 and the central connecting portion 42b of the switch body 7 is in contact with the cutout portion 17. The terminals 50 and 51 and the terminals 52 and 53 are partitioned by the partition wall portion 15.

Here, the cam 6 uses a non-lubricating thermoplastic resin as a material, and has a hole 6a through which the main shaft 5 penetrates and an engaging hole 6b through which the cam engaging pin 38 engages in the center. Two cam surfaces 54, 55 that are provided and are arranged on the outer peripheral portion in the axial direction.
Have in one. The two cam surfaces 54, 55 are
Circumferentially-arranged projection 6 provided at the center of the cam 6 in the axial direction.
separated by c. The actuator portion 43 of the contact set 13 contacts the cam surface 54 on the first case 2 side,
The actuator portion 46 of the contact set 14 is configured to contact the cam surface 55 on the second case 3 side. Further, the cam surface 54 is provided with a drop portion 54a for dropping the actuator portion 43 and separating the contact between the contact plate 44 and the contact plate 45, and the cam surface 55 for dropping the actuator portion 46 and the contact plate 47 and the contact plate 47. A recess 55a for separating the contact of the plate 49 is provided. The depressions 54a and 55a are arranged so that the actuator portion 43 and the actuator portion 46 fall simultaneously.
That is, the cam surfaces 54 and 55 have the contact points 13 and 1
4 are formed so that the on-state and the off-state modes of 4 are the same.

The gear train 9 is a gear 8 provided on the main shaft 5.
To the pendulum 9a. The gears and the pendulum 9a are connected to the shaft supporting portions 23, 24, 25,
It is rotatably supported by each shaft 22 fixed to 26.

In order to prevent water from entering the mechanical portion of the time switch 1 from the side of the knob engaging pin 36, the main shaft 5
An elastic member 39 is attached to the first case body 2 so as to surround the. Also, one end of the lid switch lever 30 is
As shown in FIG. 9, it projects from the second case 3. Then, when the lid of the dehydration tank is opened, one end thereof is pushed, the operating portion 30a engages with the contact portion 48, and the contact plate 49 is connected to the contact plate 47.
It is designed to be pulled away from.

This lid switch lever 30 is always the second
It is biased by a spring (not shown) in a direction projecting from the case 3. Further, the lid switch lever 30 is provided with a reverse rotation preventing lever portion 30b, and when the lid of the dehydration tank is closed, the lid switch lever 30 comes into contact with the locking protrusion 2b protruding inward from the outer peripheral portion of the first case 2, The rotation toward the locking projection 2b is blocked. The rotational force toward the locking projection 2b is provided by the above-mentioned spring that biases the lid switch lever 30 in the direction in which it projects from the second case 3. That is, as shown in FIG. 5, the operating portion 30a moves up and down while contacting the slope 61a provided on the wall portion 61 surrounding the lever mounting shaft 31. As a result, when the operating portion 30a moves in the protruding direction, the operating portion 30a becomes the locking protrusion 2b. It will also be accompanied by a turning direction.

A method of assembling the switch body 7 of the time switch 1 having the above structure will be described with reference to FIG. This assembling is performed by attaching the holding member 42 of the switch body 7 to the switch inserting portion 10. However, when the assembling is started, first, the contact plate 45 hits the shaft support portion 26 serving as a high position regulating portion, and the assembling. Is blocked. This state is shown in FIG. At this time, while holding the switch body 7 with one hand or the like, the tip end of the contact plate 45 is bent to the side opposite to the cam 6 (the direction of arrow A) with the tweezers or the like held in the other hand, and the shaft support portion Escape from 26 and proceed with installation. Then, next, the contact plate 49 collides with the restriction projection 27 that serves as a position restriction section having a low height, and the assembly is blocked. This state is shown in FIG. Even when this installation is blocked, the switch body 7
With the tweezers or the like held in the other hand while holding, the tip of this contact plate 49 is bent to the side opposite to the cam 6 (the direction of arrow B), escaped from the restriction protrusion 27, and the assembly is completed to complete. The state in which the assembling is completed is shown in FIG. In this completed state, the contact plate 45 and the contact plate 49 are
It is configured so as to abut on the side surfaces of the position restricting portions 26 and 27 in a bent state. These deflections are generated by the contact group 13,
This is necessary in order to surely make each contact of 14.

In this way, the shaft supporting portion 2 serving as the position regulating portion
Since 6 and the restriction protrusion 27 are set to different heights, the escape work can be alternately performed, and the switch body 7 can be easily assembled. On the other hand, if the position restricting portions 26 and 27 are at the same height, it is necessary to perform the relief work at two locations at the same time, which makes it extremely difficult to assemble the switch body 7. The height of the shaft support portion 26 serving as the high position regulating portion is about 7 mm, and the height of the regulating projection 27 serving as the low position regulating portion is about 4.5 mm.

After incorporating the switch body 7, each shaft 22 is press-fitted and fixed to the shaft support portions 23, 24, 25, and 26. Then, the cam 6 is dropped into the engagement recess 21 and the cam 6 and the contact sets 13, 14 are engaged with each other. Then, the gears and the pendulum 9a are inserted through the shafts 22, and the shaft support portions 23, 24, 2
Hold at 5,26. With the gears and the pendulum 9a incorporated, the lid switch lever 30 is inserted through the lever mounting shaft 31 and incorporated. Then, the second case 3 and the main shaft 5 with the cam engagement pin 38 are integrated through the whole movement 4 and assembled into the first case 2, and the first case 2 and the second case 3 are screwed together. Fit and fix. And
Finally, the knob engagement pin 36 and the regulation pin 37 are fixed to the main shaft 5. In such assembling, first, the shaft 22 may be press-fitted and fixed to the shaft supporting portions 23, 24, 25 and 26, and then the switch body 7 may be assembled. At that time, the contact plate 45 is placed outside the shaft 22 of the shaft support portion 26 (on the side opposite to the cam 6).
Abut the surface of so that the assembly can start.

After the cam 6 is assembled and before the first case 2 and the second case 3 are fitted and fixed, the cam surface 54,
Grease 62 is applied to 55. This grease 62 is
Wear of the cam surfaces 54 and 55 is prevented, and the actuator unit 4
It is intended to ensure smooth sliding contact of 3,46. The application of the grease 62 is carried out at one or a plurality of locations on the cam surfaces 54, 55. However, as shown in FIG. 8, when the cam 6 is rotated in the direction of arrow A at the time of assembly, the application regulating section 16 is used. It is preferable that the coating is applied at a slightly rotated forward position, that is, a position indicated by reference numeral 63 in FIG. After the application to this position, the cam 6 rotates in the direction of arrow A, and as a result, the grease 62 is leveled to a constant thickness by the application restricting portion 16. In the past, problems such as the grease 62 concentrating in a part or protruding to the contact portion occurred in the past. However, in the time switch 1, as described above, the application regulation protruding to the cam 6 side is restricted. The portion 16 equalizes the amount of the grease 62 applied to the cam surfaces 54 and 55 and removes the grease 62 applied in excess of a certain amount. Therefore, the grease 6
The application amount of 2 is small, the friction load becomes too large, the time switch 1 stops, the cam surfaces 54, 55
There is no problem such as wear. Further, there is no problem that a contact failure occurs as a result of the grease 62 being applied too much and being attached to the contact portion.

When the assembly is completed, the terminal 5
0, 51 and terminals 52, 53 are partitioned by the partition wall portion 15. Therefore, the waterproof property is improved and erroneous wiring is eliminated as compared with the case where the partition wall portion 15 is not provided. In addition, the insulating properties such as the tracking property are improved. Moreover, this contact group 13
The contact point set 14 and the contact point set 14 have different polarities as shown in FIG. 12, and it is necessary to further improve the insulating property thereof. However, the partition wall portion 15 increases the distance between the different poles. Insulation including tracking property can be sufficiently obtained. In addition, since the contact control set 13 and the contact control set 14 are partitioned even on the inner side by the coating control section 16, the insulation characteristic is further improved. It should be noted that two-pole housings 56 and 57 as shown by phantom lines in FIG. 4 are attached to the terminal portion 41, respectively. One connected to the terminal portion 41 may be a one-pole housing or a single-piece solder, and the other may be a two-pole housing, or both may be a one-pole housing or a single-piece solder.

The time switch 1 having such a configuration is used to form a part of a washing machine driving circuit as shown in FIG. That is, this time switch 1
The contact set 13 is connected to one pole of the dehydration motor 64, and the contact set 14 is connected to the other pole. The contact set 13 is directly connected to the power plug 65, and the contact set 1
4 is connected to a power plug 65 via a current fuse 66. Further, in this circuit, the washing motor 67 is connected to the power plug 65 via the washing time switch 68. The conventional time switch for dehydration is
Only the contact set 14 side is provided, and the contact set 13 side is not provided.

The washing time switch 68 is a two-wire disconnection part, which is a pair of contact points 69 and 7 which are turned on and off at the same time.
0 and 2 for alternately rotating the washing motor 67 forward and backward
It is composed of one contact set 71, 72. That is, a structure similar to the contact sets 13 and 14 of the present invention shown in FIG. 4 and the like is used for the two contact sets 69 and 70. The dehydration motor 64 and the washing motor 67 are both condenser motors, and the condensers 73,
74 are connected. Further, a current fuse 75 is arranged between the contact set 70 and the power plug 65.

Next, the operation of the time switch 1 configured as described above will be described. After the preparation for dehydration is completed, the whole dance 4 is wound up by turning the knob, and the time switch 1 is set. Here, the maximum set angle of the time switch 1, that is, the maximum rotation angle of the cam 6 is 300.
Set to degree. With this set, the actuator portions 43 and 46 are respectively set in the depression portions 54a and 55a.
Ride on the outer peripheral surfaces of the cam surfaces 54, 55. As a result, both contact plates 44 and 45 come into contact with each other and both contact plates 4
7,49 also touch. As a result, power is supplied to the dehydration motor 64, and the dehydration motor 64 rotates in a fixed direction. Then, when the set time has elapsed, the cam 6 returns to the original position due to the expanding force of the whole dance 4. Then, the actuator portions 43 and 46 simultaneously fall into the depression portions 54a and 55a, respectively, and the contact plates 44 and 45 are separated from each other, and the contact plates 47 and 49 are separated from each other. As a result, the dehydration motor 6
The power supply to 4 is cut off at the same time on both lines, that is, on both sides,
The rotation of the dehydration motor 64 stops.

Incidentally, when the lid of the dehydration tank is opened during the dehydration work, the lid switch lever 30 is pushed, and its operating portion 30a is engaged with the contact portion 48 provided on the contact plate 49,
The contact plate 49 is separated from the contact plate 47. Therefore, the contact group 14 is changed from the conductive state to the non-conductive state, and the dehydration motor 6
The power supply to 4 will be cut off. As a result, the dehydration motor 64 stops its rotation. When you close the lid of the dehydration tank,
The lid switch lever 30 is returned to its original position by the spring force. As a result, the contact plate 49 comes into contact with the contact plate 47 again. As a result, the dehydration motor 64 rotates, and the dehydration work is restarted.

In the above-described embodiment, the switch body 7 is provided with the contact portion 48 with which the operating portion 30a of the lid switch lever 30 contacts, so that the switch body 7 has a completely symmetrical structure. Not not. However, if the contact portion 48 is eliminated and the switch body 7 is made line symmetrical about the partition wall portion 15 and is made symmetrical in the axial direction, that is, vertically, the switch body 7 is fitted to the first case 2. When fixed, it can be installed upside down. By doing so, the assembling work is made more efficient.

In addition, in the above-described embodiment, the actuator members 43 and 46 and the holding member 42 of the switch body 7 have 6T.
Since nylon is used, the VO standard of safety standard can be cleared, and the insulating property such as tracking resistance is excellent and the heat resistance is sufficient. Here, V-O means
It is a standard that shows the grade of self-extinguishing property for combustion test,
Tracking resistance refers to the characteristics against smoke and ignition.

In this embodiment, the grease 62
Since it can be applied to the cam 6 in a leveled manner, it is not necessary to strictly control and check the amount of grease, and it is possible to prevent wear of the cam 6 and eliminate malfunction of the contact portion with a simple configuration. It is particularly preferable to apply the grease 62 to the non-lubricated cam 6 as shown in the present embodiment, but it is preferable to apply the grease 62 even when the cam 6 made of a lubricating material is used. Is preferred.

The above-described embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. is there. For example, the drive source may be a motor in addition to Zenmai 4. Further, the cam 6 has the cam surfaces 54 and 55 in the height direction, but if the maximum set angle is 180 degrees or less, two cam surfaces may be formed on the same plane. it can.

Further, in order to make the height of the position regulating portion different, the heights of the shaft support portion 26 and the regulating projection 27 are made different, but the contact piece itself is a part of the position regulating portion, and its width is changed. Alternatively, the height of the position regulating portion may be changed by changing the mounting position in the axial direction. That is, for example,
When the shaft support portion 26 and the restriction protrusion 27 have the same height, and the width of the contact plate 45 is made wider than the width of the contact plate 49, when assembled,
First, the contact plate 45 may hit the shaft support portion 26.

Further, in the above-mentioned embodiment, the so-called two-wire cut timer for dehydration is shown, but the present invention is also applicable to a time switch for washing or other equipment or a time switch other than two-wire cut, not for dehydration. Can be applied.

[0045]

As described above, in the time switch according to the first aspect of the present invention, since the two contact sets come into contact with each other from both sides of the cam, the elastic contact force does not increase and the elastic contact force to the cam does not increase. You can get a balance. Therefore, problems such as wear of the cam surface and the actuator and eccentricity of the cam are reduced.
Moreover, since parts such as sliders and levers are not required, the number of parts can be reduced, and two contact groups can be installed in correct positions one after another during assembly, resulting in improved manufacturing efficiency and cost reduction.

According to the second aspect of the present invention, since the two cam surfaces having the same on-state and off-state modes are provided, it can be used as a so-called two-line disconnection timer, and equipment using this time switch. Can be made electrically safe.

Further, in the invention according to claim 3, when the time switch is used for a so-called two-line cutting timer, the turning angle of the cam can exceed 180 degrees and the setting angle can be widened. You can get the time switch of. In addition, according to the fourth aspect of the invention, since the position restricting portion is formed by molding integrally with the case body that constitutes the case of the time switch, the manufacturing thereof can be simplified and the structure can be configured accurately.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a time switch of the present invention.

FIG. 2 is a front view seen from the direction of arrow II in FIG.

FIG. 3 is a developed sectional view of a main part of the time switch of FIG.

FIG. 4 is a plan view of the time switch of FIG. 1 from which a second case and a gear train are removed.

5 is a plan view of a first case used in the time switch of FIG. 1 and a partially enlarged side view as seen from the direction of arrow A. FIG.

FIG. 6 is a half cross-sectional side view of the first case and the second case used in the time switch of FIG. 1 as seen from the front.

7A and 7B are views showing a switch body incorporated in the time switch of FIG. 1, in which FIG. 7A is a plan view, FIG. 7B is a front view seen from the arrow B direction in FIG. It is the side view seen from the arrow C direction of (A).

8 is a plan view of the time switch of FIG. 1 with the second case removed, illustrating the application of grease and the leveling of the application amount.

9 is a fragmentary side view in which a lid switch lever is attached to the time switch of FIG.

10 is a half cross-sectional side view of the time switch of FIG.

FIG. 11 is a diagram for explaining a procedure when the switch body is incorporated in the time switch of FIG.

FIG. 12 is a circuit diagram of a washing machine in which the time switch of FIG. 1 is used.

FIG. 13 is a main part of a circuit diagram of a conventional washing machine.

[Explanation of symbols]

 1 Time Switch 2 1st Case 3 2nd Case 4 Full Dance (Drive Source) 5 Spindle 6 Cam 7 Switch Body 13,14 Contact Set 26 Shaft Support (Position Restriction) 27 Restriction Protrusion (Position Restriction) 42 Holding Member 43,46 Actuator part 54,55 Cam surface

Claims (4)

[Claims] 1. A time switch having a cam which is driven to rotate by a drive source and a contact plate which is turned on and off by being driven by a cam surface formed on the cam. Is provided on a common holding member, and the two contact sets are opposed to each other across the cam in a state where one contact plate of each contact set is position-regulated by a position-regulating portion. A time switch, wherein the time switches are arranged so that the heights of the two position regulating portions are different. 2. The cam is provided with two cam surfaces having the same on-state and off-state modes, respectively, and the two contact groups are respectively brought into contact with the two cam surfaces to control the cams. The time switch according to claim 1, wherein the time switch is provided. 3. The cams of the two contact sets are arranged on the same plane, and the cam surfaces that are in the same mode are arranged side by side in the height direction of the cam and in the circumferential direction. By changing the height of the actuator portion that comes into pressure contact with the surface, one of the actuator portions is brought into contact with one of the cam surfaces formed side by side in the height direction, and the other of the actuator portions is attached to the other of the cam surfaces. The time switch according to claim 2, wherein the time switch is brought into contact with the time switch. 4. The time switch according to claim 3, wherein the position restricting portion is formed by molding integrally with a case body forming a case of the time switch.