JP2001202860A - Time switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a time switch of novel structure which can be easily manufactured by compactly containing an electric motor along with a gear train in a case and can be simply constituted by eliminating an earth terminal at a housing of the electric motor, and which can gradually avoid harmful influence by each part for constituting the gear train and in which the electric motor along with gear train or the like can be contained in the case. SOLUTION: In addition to an employment of a predetermined structure of plate motor 32, a predetermined structure of case 264 made of non-conductive material is employed. An inside of the case 264 is substantially divided into an area for containing the plate motor 32 and an area for containing a power transferring system 33 such as a gear train. Therefore, a simplification of structure and production workability can be improved by eliminating an earth terminal at the case 264, and also there can avoid the harmful influence to the plate motor 32 by each part for constituting the power transferring system 33 as much as possible, so that a stable operation an be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time switch suitably used for an electric timer of a microwave oven or the like, and more particularly to a time switch having a novel structure which is compact and excellent in assembling workability.

[0002]

2. Description of the Related Art A time switch provided with a timed contact of an electric path which is cut off after a predetermined time has elapsed has been widely used in electric appliances such as a microwave oven. 2. Description of the Related Art There is known a motor-type time switch in which a timed cam mechanism capable of adjusting and setting a timed time for disconnecting a contact is driven by an electric motor. For example, Japanese Patent Application Laid-Open No. 3-78926 and Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No. 98226, Japanese Patent Application Laid-Open No. H11-20409 and the like are those.

In such a time switch, as described in the above-mentioned publication, an electric motor is used for the purpose of suppressing power consumption of the electric motor and enabling setting of a long time period. A gear train composed of a number of reduction gear pairs is arranged between the motor and the timing cam mechanism, and the rotational driving force of the electric motor is transmitted to the time cam mechanism via the reduction gear train.

The time contact, the time cam mechanism, and the reduction gear train in the time switch are generally accommodated in a case in order to obtain stable operation over a long period of time. On the other hand, as described in the above-mentioned publication, the stator is configured by an iron hollow disk-shaped housing as the electric motor, and the coil is housed and arranged on an outer peripheral portion in the housing. A cylindrical synchronous motor having a structure in which a rotor made of a permanent magnet is disposed in a central portion is employed. Since the motor is large in size, it is generally assembled so as to be exposed outside the case of a time switch.

However, in such a conventional time switch, since the iron housing of the electric motor is directly exposed to the outside, it is necessary to provide a ground terminal in the housing to ensure safety. However, there is a problem that the production is complicated and complicated. Also, in the conventional structure of the time switch, it is necessary to fix the electric motor to the outer surface on the back side of the case with a bolt or the like, avoiding the front side of the case where the time dial for adjusting the time limit is provided. There is also a problem that the case has to be turned over one by one, and the manufacturing operation is troublesome and time-consuming.

[0006] In order to deal with such a problem,
Although it is conceivable to incorporate the cylindrical electric motor as described above in a state accommodated in the case of the time switch, if the electric motor is to be accommodated in a case in which many gear trains are arranged, the case becomes extremely large. There was a problem. In particular, in a time switch for a microwave oven or the like, as described in Japanese Patent Application Laid-Open No. 3-78926, a high-speed gear train and a low-speed gear train are provided side by side, and speed switching for selectively operating them is performed. A structure in which a mechanism is provided to switch the drive speed of the timed cam mechanism by the electric motor in accordance with the set amount of timed time in the timed cam mechanism, or as described in Japanese Patent Application Laid-Open No. 3-98226. A structure in which a cycle contact that is interrupted at a predetermined cycle set in the cycle cam mechanism is provided, and a device such as a magnetron is operated intermittently by the cycle contact, is preferably employed. Adopting such a structure requires more complicated and many gear trains and structural components such as clutches, which need to be accommodated in a case. Assembling in a housing state over data in the case, the space to be had extremely difficult.

Further, when the motor is housed in the case, grease attached to a number of gear trains and clutches housed in the case, and conductive members or clutches constituting such gear trains, clutches, contacts, and the like. The motor may be adversely affected by magnetic members and the like. Furthermore, in the conventional large-sized cylindrical motor, since the heat generated by the Joule heat of the coil is large, when the motor is housed in the case, there is a possibility that the heat radiation may be insufficient.

[0008]

Here, the present invention has been made in view of the above-described circumstances, and a problem to be solved is that an electric motor is housed in a case compactly together with a gear train and the like. It is an object of the present invention to provide a time switch having a novel structure that can be easily assembled and manufactured, and can simplify the structure by eliminating the need for a ground terminal of a housing of an electric motor.

Further, the present invention provides a time switch having a novel structure in which an electric motor is housed in a case together with a gear train and the like while avoiding as much as possible adverse effects of various members constituting the gear train and the like. Providing is also a solution.

[0010]

An embodiment of the present invention which has been made to solve such a problem will be described below. In addition, each component employed in each embodiment described below can be employed in any combination as possible. In addition, aspects and technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or based on an inventive idea that can be understood by those skilled in the art from the descriptions. It should be understood that the

That is, a first aspect of the present invention is a timed cam which is housed and arranged in a non-conductive case and cuts off a timed contact provided in the case, and is capable of adjusting and setting a timed time. In a time switch configured to operate a mechanism by a drive motor via a reduction gear train housed and disposed in the case, a first switch is disposed inside the case with a partition plate interposed therebetween. A plurality of magnetic poles are set on the outer peripheral surface by permanent magnets with respect to a magnetic pole forming portion of a stator made of a plate-like magnetic material with a coil mounted thereon as the driving motor while forming a housing area and a second housing area. A plate motor having a rotor disposed therein, and the plate motor is accommodated and arranged in the first accommodating area, while the reduction gear train and the timed cam mechanism are arranged in the second accommodating area. And a transmission gear for receiving the timed contacts and arranging the first contact area and the second accommodation area so as to straddle the first contact area and the second accommodation area to transmit the rotational driving force of the plate motor to the reduction gear train. Is provided.

In the time switch having the structure according to this aspect, the use of the plate motor allows the non-conductive case to be used as the motor housing. Since the ground terminal is not required, the structure can be simplified and the productivity can be improved. In addition, the first housing area and the second housing area are formed in the case, and the housing area of the plate motor is substantially divided from the housing area of the gear train or the like, so that various gears constituting the gear train or the like are formed. An adverse effect of the member on the plate motor can be avoided as much as possible, and stable operation can be realized.

The non-conductive case in this embodiment is desirably a non-magnetic material. For example, a case made of a synthetic resin such as an ABS resin is preferably used. In addition, the transmission gear that transmits the rotational force from the plate motor to the reduction gear train by being disposed astride between the first storage region and the second storage region and meshing with the reduction gear train. For example, a pinion directly fixed to the rotation shaft of the rotor of the plate motor can be used, but the pinion fixed to the rotation shaft of the rotor is accommodated and arranged in the first accommodation region, and the pinion is It is also possible to configure a transmission gear by the meshed reduction gear. By employing such a reduction gear as a transmission gear, the degree of freedom in setting the arrangement position of the transmission gear in the second accommodation area is advantageous regardless of the position of the plate motor arranged in the first accommodation area. Can be secured. Further, by using the support shaft for the reduction gear as the transmission gear, it is possible to arrange the engagement mechanism for preventing the reverse rotation of the plate motor compactly, thereby improving the operation stability of the plate motor. Can also be achieved. In the plate motor having the structure according to this aspect, a ventilation hole for cooling may be formed in the wall defining the first housing area. Further, in the plate motor having the structure according to the present invention, it is preferable that the rotating shafts of the transmission gear, the reduction gear train, the timed cam, and the like be disposed in parallel with the rotating shaft of the rotor of the plate motor. The space efficiency of the accommodation area is improved, and further compactness can be achieved.

According to a second aspect of the present invention, in the time switch having the structure according to the first aspect, the gear train includes a high-speed gear train for operating the timed cam mechanism at a high speed; A speed switching mechanism configured to include a low-speed gear train for operating the cam mechanism at a low speed, and for selectively operating the high-speed gear train and the low-speed gear train according to the time limit in the timed cam mechanism. Provided,
The speed switching mechanism is housed and arranged in the second housing area. According to this aspect, for example, in a time switch employed in a microwave oven or the like to set the operation time, the drive speed of the timed cam mechanism by the electric motor is switched according to the set amount of the timed time in the timed cam mechanism. Thereby, the selection range of the long operation time setting can be made sufficiently large while ensuring the highly accurate adjustment performance at the time of the short operation time setting. And
In particular, by disposing a speed switching mechanism including a high-speed gear train and a low-speed gear train in the second housing area of the case, various members constituting the speed switching mechanism and the plate motor can be interposed. Adverse effects are avoided as much as possible, and stable operation can be realized.

According to a third aspect of the present invention, there is provided a time switch having a structure according to the first or second aspect, wherein the cycle contact is driven by the plate motor to set the cycle contact in advance. A cycle cam mechanism for connecting and disconnecting in a predetermined cycle is provided, and the cycle contacts and the cycle cam mechanism are housed and arranged in the second housing area. According to this aspect, a power control switch or the like, which is employed in a microwave oven or the like and adjusts the power by changing the intermittent operation time of the magnetron, can be advantageously realized. By disposing the cycle cam mechanism in the second housing area of the case, adverse effects between the various members constituting the speed switching mechanism and the plate motor are also avoided as much as possible, and a stable Operation can be realized.

According to a fourth aspect of the present invention, in the time switch having the structure according to any one of the first to third aspects, a doorbell is exposed to the outside of the case and fixed. And a striking mechanism for projecting a striking member for ringing the doorbell outward from the case member, and further driving the striking member in conjunction with disconnection of the timed contact. The bell mechanism is housed and arranged in the second housing area. In the time switch having the structure according to this embodiment, for example, in a microwave oven or the like, it is possible to easily configure a door bell for notifying operation completion or the like due to expiration of a set time by the time switch. By being fixed to the outside of the non-conductive case member, electrical independence with respect to the plate motor housed and arranged in the case member is advantageously secured, and the metallic doorbell is secured with sufficient electrical safety. In addition, it can be easily adopted.

According to a fifth aspect of the present invention, there is provided a time switch having a structure according to any one of the first to fourth aspects, wherein the case is connected to an outer wall of the first housing area. A first opening box that forms the peripheral wall, a second opening box that forms the peripheral wall of the partition and the second storage area, and the second opening box that covers the opening of the second opening box. It is characterized in that it is divided and formed by a lid constituting an outer wall of the second housing area. In the time switch having the structure according to this aspect, the case having the first and second housing areas can be easily formed with a simple structure, and in particular, the first opening box body , The assembling of the second opening box to the first opening box, and the assembling of the gear train and the like to the second opening box can be sequentially performed from the same side. Since it is possible, the productivity can be further improved.

According to a sixth aspect of the present invention, in a time switch having a structure according to any one of the first to fifth aspects, the stator is constituted by a pair of divided plate-like bodies, The pair of plate-like bodies are fixed to each other by being fitted into the center hole of the coil from both sides in the axial direction. In the time switch having the structure according to the present aspect, the plate motor can be easily formed with a simple structure, thereby simplifying the structure of the time switch and improving the productivity. Can be achieved. In particular, by fitting and fixing a pair of divided plate-shaped members to the center hole of the coil formed by the bobbin, etc., the workability of assembling the divided plate-shaped members is improved, and the production of the plate motor and the time switch is further improved. This can further improve the performance. In addition, the pair of divided plate-like bodies are appropriately positioned and fixed to the case at an appropriate place other than the fitting part into the center hole of the coil. Further, any plate-like member made of a ferromagnetic material such as iron can be used as the divided plate-like body in this embodiment. For example, a plate-like member punched and formed into an appropriate shape by press working or the like can be used. Is preferably used.

According to a seventh aspect of the present invention, there is provided a time switch having a structure according to any one of the first to sixth aspects, wherein in the plate motor, both side portions of the coil in the stator are provided. It is characterized in that the short-circuit portions magnetically connected to each other are formed independently of the magnetic pole forming portion. In this aspect, by connecting the axially opposite sides of the coil in the yoke with the short-circuited portion formed independently of the magnetic pole forming portion, the magnetic pole generated in the magnetic pole forming portion and, consequently, the rotation exerted on the rotor. While avoiding the adverse effect on the driving force as much as possible, the self-inductance of the coil can be increased to suppress the conduction current, and the generated Joule heat can be suppressed, so heat damage when housed in the case Can also be advantageously avoided. Also, by reducing the number of coil turns,
The size of the coil and thus the motor can be reduced, and the occurrence rate of defective products due to troubles such as disconnection during coil winding can be reduced. Further, it is possible to omit another member such as a capacitor for suppressing the amount of current supplied to the coil, thereby reducing the number of components and further simplifying the structure. In this embodiment, “independently” means “formed without forming the magnetic pole forming portion in a part of the magnetic path of the short-circuit portion”, and for example, from the iron core portion to the magnetic pole forming portion. This is realized by forming a short-circuit portion by branching off from the site. Further, the positions of the magnetic pole forming portion and the short-circuit portion with respect to the coil are not particularly limited. For example, the magnetic pole forming portion and the short-circuit portion may be formed on one side of the coil in the axial direction or on one side in the direction perpendicular to the axis. It is.

According to an eighth aspect of the present invention, in the time switch having the structure according to the seventh aspect, a pair of plate-like divided bodies in which the stator of the plate motor is combined with each other from both axial sides of the coil. The pair of plate-like divided bodies are inserted into the center hole of the coil from both sides in the axial direction and overlap each other, and the pair of plate-like divided bodies are placed on one side in the direction perpendicular to the axis of the coil. Forming the magnetic pole forming portion by opposing each other, and forming the short-circuit portion by overlapping the pair of plate-shaped divided members on the other side in the direction perpendicular to the axis of the coil, Features.

In the time switch having the structure according to the eighth aspect, the stator of the plate motor can be easily formed with a small number of parts and a simple structure. Further, by locating the magnetic pole forming portion and the short-circuit portion on both sides sandwiching the coil in the direction perpendicular to the axis, the height dimension of the first housing area in which the plate motor is housed can be sufficiently reduced, The magnetic field generated by the coil can be more efficiently collected by the short-circuit portion, and accordingly, the leakage magnetic flux is more advantageously suppressed, the improvement of the self-inductance of the coil is advantageously realized, and the conduction current can be suppressed.

In this embodiment, the pair of plate-like divided bodies may be, for example, projecting in opposing directions (plate width direction) at a substantially central portion of the longitudinal plate portion and at both longitudinal end portions of the longitudinal plate portion. It is possible to suitably adopt a structure in which the projecting portions are integrally formed, whereby the projecting portions in the substantially central portion of the long plate-like portion are inserted into the center hole of the coil from both sides and overlapped with each other to thereby form the core portion. And a short-circuit portion is formed by overlapping the protrusions on one end in the longitudinal direction with each other, and a magnetic pole forming portion is formed by separating the protrusions on the other end in the longitudinal direction so as to face each other. You can do it. When the protruding portions of the pair of divided plate-like bodies are overlapped to form the iron core portion and the short-circuit portion in such a manner, the distance between the central protruding portion of one of the long plate-like portions and the protruding portion for the magnetic pole forming portion is determined. It is desirable to form a step having a height corresponding to the plate thickness, so that both protruding portions constituting the magnetic pole forming portion can be opposed to each other on substantially the same plane. Further, the formation portion of the core portion of the pair of divided plate-like bodies may be fitted in the center hole of the coil so as to be closely fixed to each other in the overlapping direction. By using the holes for the combination of the divided plate members, the fixing strength of the divided plate members is increased, and the divided plate members can be easily assembled with a simple structure.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show a front view and a side view of an operation unit 12 having a time switch 10 for a microwave oven having a structure according to the present invention, and FIG. An assembly explanatory diagram of the operation unit 12 is shown. In this operation unit 12, a time switch 10 is mounted on a fixed panel 14 fixed to a microwave oven main body, and a time timer shaft 16 and a cycle timer shaft 18 of the time switch 10 A turning operation is performed by a setting knob 20 and a power amount adjusting knob 22. Then, the time switch 1 is turned on the cooking time setting knob 20.
The cooking time of the microwave oven can be set by operating the time period timer of 0, and the power amount of the microwave oven can be adjusted by operating the cycle timer of the time switch 10 with the power amount adjustment knob 22. Can be done. The cycle timer shaft 18 of the time switch 10 is rotated via a rack 24 provided between the time switch 10 and the fixed panel 14 by a rotation operation shaft 26 to which the power adjustment knob 22 is attached. It has become.

More specifically, as shown in FIG. 4, the time switch 10 of the present embodiment serves as a contact for turning on / off power supply to a magnetron (not shown) and as a main switch for determining a cooking time. Timed contact 28
And a cycle contact 30 as a cycle switch for determining the amount of power (power) by adjusting the intermittent operation time of a magnetron (not shown) within the cooking time. The timed contact 28 is opened and turned off only when the timed timer shaft 16 is at the initial rotation position, and the timed timer shaft 16 is turned in the direction of arrow X. As a result, the time contact 28 is closed to start power supply to a magnetron (not shown), and power supply to the plate motor 32 as a drive motor is also started. The magnetron (not shown) operates until the timer 16 is rotated in the opposite direction to the operation direction and the timed timer shaft 16 returns to the initial rotation position, that is, a time corresponding to the amount of rotation operation of the timed timer shaft 16. It is in a state. On the other hand, the cycle contact 30 is connected to a cycle timer shaft 1 that is set by a rotation operation of the rotation operation shaft 26 (see FIG. 3).
ON / OFF at a predetermined time interval corresponding to the turning position of 8
The rotation position of the cycle timer shaft 18 is appropriately changed and set so that the power supply to the plate motor 32 is continued and only the power supply to the magnetron (not shown) is continuously or intermittently performed. The magnetron (not shown) is substantially operated at a time ratio corresponding to the rotation position of the cycle timer shaft 18, that is, the rotation position set on the rotation operation shaft 26, to adjust the electric energy.

Here, a power transmission system 33 as a reduction gear train including a gear train, a clutch, a cam mechanism and the like constituting a cooking time setting mechanism by the timed timer shaft 16 and a power amount adjusting mechanism by the cycle timer shaft 18. For example, a known mechanism disclosed in, for example, Japanese Patent Publication No. 7-101586 can be adopted, and will be briefly described below.

That is, FIG. 4 shows a power transmission system 33 including a gear train, a clutch, a cam mechanism and the like constituting a cooking time setting mechanism by the timed timer shaft 16 and a power amount adjusting mechanism by the cycle timer shaft 18. And a timed timer unit 3 as a timed cam mechanism for turning on / off a timed contact.
4, an electric energy adjustment timer section 36 as a cycle cam mechanism for turning on / off a cycle contact, and their operation systems are further shown.

First, the timed timer section 34 will be described. The time timer unit 34 has a main shaft gear 38 fixed to the main shaft 16 that is rotated by the cooking time setting knob 20, and a time cam 40 attached to the main shaft 16 so as not to rotate relative thereto. . A timed contact 28 comprising a fixed contact plate 42 and a movable contact plate 44 is provided near the timed cam 40, and the timed contact 28 is closed.
In the N state, power is supplied to a magnetron (not shown) and power to the plate motor 32, and power supply to both is stopped in the OFF state in which the timed contact 28 is open. I have. A timed cam lever 46 is provided between the timed cam 40 and the timed contact 28 so as to be swingable around one axis. The tip of the timed cam lever 46 is slidably contacted with the outer peripheral surface of the timed cam 40. When the timed cam lever 46 is in the initial position, the timed cam lever 46 is moved to the timed cam 40.
When the timed timer shaft 16 is manually rotated, the distal end of the timed cam lever 46 rides on the large diameter portion of the timed cam 40 to move the movable contact plate. By pressing the 44 toward the fixed contact plate 42, the electrical contact between the two contact plates 44, 42 is closed. By manually rotating the timed timer shaft 16 by a predetermined amount, the operation of the plate motor 32 is started, and the rotation driving force is applied to the main shaft gear 38 through the gear train, so that the timed cam 40 is rotated. Is driven toward the initial position opposite to the manual rotation direction, and the magnetron is operated only for the time until the timed cam 40 returns to the initial position.

A high-speed gear train 48 and a low-speed gear train 50 are employed as gear trains for transmitting the rotational driving force of the plate motor 32 to the timed timer shaft 16 that has been manually rotated. The gear trains 48 and 50 are switched by the switching mechanism 52 and are selectively operated according to the rotation position of the timed timer shaft 16, so that the output gear fixed to the output shaft 54 of the plate motor 32 is provided. The rotational driving force of a transmission gear 58 meshed with and driven to rotate by
The transmission is transmitted to the main shaft gear 38 of the timed timer shaft 16 at a speed reduction ratio for high speed or low speed, and the timed cam 40 is rotated. The transmission gear 58 meshed with the output gear 56 of the plate motor 32 has a large gear 60 and a small gear 62 integrally formed coaxially.
0 is meshed with the output gear 56 to form a reduction gear mechanism.

Next, the high-speed gear train 48 and the low-speed gear train 50 will be described. High-speed gear train 48
Is the first car 64, the second car 66, the third car 68, the fourth car 7
It is constituted by the 0th and 5th wheels 72 and the 6th wheel 74. The low-speed gear train 50 has a first wheel 64 and a second wheel 6.
6th and 3rd car 68, 7th car 76, 4th car 70, 5th car 72
And the sixth wheel 74. The first wheel 64 has a first pinion 78 and a large-diameter first gear 80 integrally formed coaxially.
0 is meshed with the small gear 62 of the transmission gear 58. 2
The second wheel 66 is a second pinion 82 integrally formed coaxially.
And a large-diameter second gear 84, and the second gear 84
The first wheel 64 is meshed with the first pinion 78. The third wheel 68 is a large-diameter third gear 86 integrally formed coaxially.
And the third intermittent gear 88, and the third gear 86 is meshed with the second pinion 82 of the second wheel 66. 4th car 7
No. 0 has a fourth pinion 90 and a large-diameter fourth gear 92 disposed coaxially with each other and a fourth pinion 9.
A large number of first engaging teeth 94 having a saw-tooth shape are continuously provided in the circumferential direction on one end surface in the axial direction of 0 (the upper end surface in FIG. 4). Furthermore, a first sliding ring 96 is interposed between the fourth pinion 90 and the fourth gear 92 to form a first friction clutch, and the center of the fourth pinion 90 and the fourth gear 92 is formed. The relative rotation on the shaft is allowed under the sliding resistance. The fifth wheel 72 has a fifth pinion 98 and a large diameter fifth gear 100 integrally formed coaxially. The fifth gear 100 is meshed with the fourth pinion 90 of the fourth wheel 70. I have. The 6th wheel 74 is a 6th wheel arranged coaxially with each other.
A second sliding ring 106 is interposed between the sixth pinion 102 and the sixth gear 104, and a second friction clutch is provided between the sixth pinion 102 and the sixth gear 104. And the sixth pinions 102 and 6
The relative rotation of the number gear 104 on the central axis is allowed under the sliding resistance. The sixth wheel 74
No. 6 pinion 102 is meshed with the main shaft gear 38 of the timed timer shaft 16. Thereby, the plate motor 3
The rotation driving force generated on the second output shaft 54 (output gear 56) is transmitted to the timed timer shaft 16 via the transmission gear 58, the high-speed gear train 48 including the first to sixth wheels and the main shaft gear 38. To be transmitted.

On the other hand, the low speed gear train 50
The count wheel 76 has a seventh gear 108 and a seventh intermittent gear 110 integrally formed coaxially.
8 and 110 are the third wheel & pinion 68 constituting the high-speed gear train 48.
No. 3 intermittent gear 88. Note that these three
In the gear pair formed by the combination of the intermittent gear 88 and the seventh intermittent gear 110, an extremely large reduction ratio is realized by the intermittent operation. Further, the seventh wheel & pinion 76 is disposed on the same central axis as the fourth wheel & pinion 70 constituting the high-speed gear train 48, and is arranged to approach / separate from the fourth wheel & pinion 70 in the axial direction. Relative displacement is allowed. A coil spring 112 is provided between the opposing surfaces of the fourth wheel 70 and the seventh wheel 76.
With the urging force of No. 12, the seventh wheel 76 is urged away from the fourth wheel 70. Also, on the lower surface in the axial direction of the seventh wheel & pinion 76, a large number of sawtooth-shaped second engagement teeth 114 are provided on a portion of the fourth & pinion 70 facing the first engagement tooth 94 of the fourth pinion 90. It is provided continuously in the circumferential direction. In addition, 4
The first engagement tooth 94 of the number pinion 90 and the second engagement tooth 114 of the seventh wheel & pinion 76 have a sawtooth shape which is inclined to the circumferentially opposite sides so as to engage with each other in one circumferential direction. Have.

The seventh wheel & pinion 76 is displaced in the axial direction by the switching mechanism 52, and
The position is switched between the separated position and the engaged position. The switching mechanism 52 is provided so as to be swingable around a circumferentially extending cam groove 116 formed on one surface of the main shaft gear 38 in the axial direction and a swing center axis 118 parallel to the timed timer shaft 16. The switching oscillator 120 is used. Main shaft gear 38
The cam groove 116 is formed with a predetermined length in the circumferential direction of the main shaft gear 38, and extends circumferentially on the outer peripheral portion of the main shaft gear 38 at the circumferential end side of the timed timer shaft 16 in the manual rotation direction. The large-diameter portion and the main shaft gear 3 at the other end in the circumferential direction
8 has a small diameter portion extending in the circumferential direction on the inner peripheral side portion, and a gradually changing portion continuously connecting the large diameter portion and the small diameter portion at the circumferential center portion. The switching rocker 120 has a cam groove 116 of the main shaft gear 38 at one protruding tip.
And the main gear 3
The swing position about the swing center axis 118 is set in accordance with the rotation position of the swing shaft 8. Further, a long hole 124 extending in the circumferential direction around the swing center axis 118 is formed at the other protruding tip end of the switching rocking body 120, and the seventh wheel & pinion 76 rotates with respect to this long hole 124. The central shaft is inserted and slidably disposed in the elongated hole 124. The peripheral wall 128 of the elongated hole 124 has an axial thickness that varies in the major axis direction of the elongated hole 124, the lower surface thereof has a stepped shape, and one side in the major axis direction has a shallow bottom surface 13.
0, and the other side in the major axis direction is a deep bottom surface 132 protruding downward, and an inclined bottom surface is provided between the shallow bottom surface 130 and the deep bottom surface 132. The bottom surface of the peripheral wall 128 of the long hole 124 is the seventh wheel 7
6 is in contact with the protruding distal end surface of the central boss portion 126,
The shallow bottom surface 130 of the peripheral wall 128 is the central boss 1 of the 7th wheel 76
Under the state of contact with the second wheel 26, the seventh wheel 76 is held at a position separated from the fourth wheel 70 by the urging force of the coil spring 112, while the deep bottom surface 132 of the peripheral wall 128 is
In the state of contact with the central boss portion 126 of the
6 is the fourth wheel 7 against the urging force of the coil spring 112
0 and is held in contact with the first engagement tooth 94.
And the second engagement teeth 114 are held in an engaged state.

That is, the switching rocker 120 has a small rotation operation amount of the timed timer shaft 16, and in the rotation position where the engagement protrusion 122 is engaged with the large diameter portion of the cam groove 116, the peripheral wall 1
28 shallow bottom surface 130 abuts on 7th wheel 76 and 7th wheel 7
6 is moved away from the fourth wheel & pinion 70, while the amount of rotation of the timed timer shaft 16 increases, and the engagement protrusion 12
2 is engaged with the small diameter portion of the cam groove 116,
The deep bottom surface 132 of the peripheral wall 128 is
The center wheel 76 is engaged with the fourth wheel 70. When the seventh wheel 76 is separated from the fourth wheel 70, the driving force is not transmitted from the seventh wheel 76 to the fourth wheel 70 in the low-speed gear train 50, and only the high speed wheel 70 is used. The driving force is transmitted by the gear train 48.
On the other hand, in a state where the seventh wheel & pinion 76 is engaged with the fourth wheel & pinion 70, the rotation speed of the fourth pinion 90 of the fourth wheel & pinion 70 is limited by the seventh wheel 76 which is rotated at a low speed. ,
A fourth gear 92, which is rotated at a high speed by a third wheel 68, is slid relative to a fourth pinion 90 at a position where the fourth slide pin 96 overlaps the fourth pinion 90, and a high-speed rotation drive to a fifth wheel 72 is performed. The power is cut off, and only the low-speed rotation driving force is transmitted to the timed timer shaft 16 via the fifth wheel & pinion 72.

Next, the power adjustment timer unit 36 will be described. The power amount adjustment timer unit 36 has an adjustment cam 134 fixedly mounted on the cycle timer shaft 18.
A mountain-shaped pressing projection 162 projecting downward in the axial direction is integrally formed, and has a substantially disk-shaped switch operation cam 136 supported by the cycle timer shaft 18 so as to be rotatable around the central axis. . A cycle contact 30 including a fixed contact plate 138 and a movable contact plate 140 is provided near the switch operation cam 136.
Under the condition that the timed contact 28 is in the ON state, the cycle contact 30 is turned on in the closed ON state, so that energization to a magnetron (not shown) is allowed, while the cycle contact 30 is turned off in the open state. Thus, the power supply to the magnetron (not shown) is stopped. Further, a cycle cam lever 142 is provided between the switch operation cam 136 and the cycle contact 30 so as to be swingable around one axis. This cycle cam lever 1
One of the protruding ends of 42 is a locking portion 144 locked to the operating contact plate 140 of the cycle contact 30,
A cam contact portion 146 is formed at the other protruding tip portion, and the cam contact portion 146 is provided on the switch operation cam 13.
6 is driven to swing.

That is, the switch operation cam 136
The outer peripheral surface on the upper side in the axial direction has the cycle cam lever 142
The cam contact portion 146 is formed as a guide surface 156 with which it slides, and an outer peripheral gear 148 is provided on the outer peripheral surface on the lower side in the axial direction. Reduction gear 15 having a gear 150 and a large gear 152
In addition to being engaged with the fourth small gear 150, the large gear 152 of the reduction gear 154 is engaged with the fourth gear 92 of the fourth wheel 70 constituting the high-speed gear train 48. As a result, the switch operation cam 136 moves the plate motor 32
Is used as a drive source, and is driven to rotate at reduced speed. The switch operation cam 136 is freely movable in the direction of the central axis, and is always urged upward by the second coil spring 156. Furthermore,
The guide surface 156 of the switch operation cam 136 is
The switch operation cams 136 are formed with inclined surfaces 158 and 158 that are inclined and extend from the upper end surfaces in the axial direction. On the inner peripheral side of the inclined surfaces 158, 158, mountain-shaped projections 160, 160 extending in the circumferential direction are provided so as to protrude upward in the axial direction.

Then, such a switch operation cam 13
6 is rotated continuously by the plate motor 32, but the cam contact portion 146 of the cycle cam lever 142
Is in contact with the outer peripheral guide surface 156 of the switch operation cam 136, the movable contact plate 140
8 and the cycle contact 30 is cut off. The subsequent rotation of the switch operation cam 136 causes the projection 160 of the switch operation cam 136 to ride on the chevron projection 162 of the adjustment cam 134, and the switch operation cam 136 is pushed down in the axial direction. Is the outer peripheral guide surface 156 of the switch operation cam 136.
Of the switch operation cam 136 in the axial direction. As a result, the cam contact portion 146 is allowed to move toward the cycle timer shaft 18 and the cycle cam lever 142 is allowed to swing, so that the movable contact plate 140 moves toward the fixed contact plate 138 based on its elasticity. As a result, the cycle contacts 30 between the contact plates are closed and brought into an energized state. Further, the switch operation cam 136
Continue rotating, the cam contact portion 146 is guided by the inclined surface 158 of the switch operation cam 136, and from the upper surface in the axial direction of the switch operation cam 136 to the outer peripheral guide surface 156 of the switch operation cam 136 again. It is returned to the contact state. Accordingly, in the electric energy adjustment timer section 36 having the above-described structure, the cycle timer shaft 18 is rotated to operate the relative position of the angled projection 162 of the adjustment cam 134 with respect to the cam contact section 146 of the cycle cam lever 142. Is manually adjusted, the power amount can be adjusted by setting the ratio of the energizing time to the non-energizing time within one rotation of the switch operation cam 136, that is, the actual operating time ratio of the magnetron. I have.

Incidentally, such a switch operation cam 136 is used.
ON / OFF switching by the rotation of the plate motor 32 is continued during the operation time set by the timed cam 40 in the timed timer section 34 described above.
When the power supply to the power supply is stopped, the operation is stopped. The timer switch 10 is provided with a bell mechanism 171. When the set time of the timed cam 40 expires, the turning power applied to the timed cam lever 46 is applied to the rotation center shaft 170 of the timed cam lever 46. Is applied to the striking member 172 (see FIGS. 1 and 2) which is elastically locked, and the striking member 172 (see FIGS. 1 and 2) is turned around the turning center axis 170. ,
The striking member 172 (see FIGS. 1 and 2) hits the doorbell 314 which is exposed and assembled and emits a striking sound of cooking completion.

In the time switch 10 of the present embodiment, a plate motor 32 having a specific structure is used as a driving source for applying a driving force to the timed timer shaft 16 and the cycle timer shaft 18 via the power transmission system 33 as described above. Has been adopted. The plate motor 32 includes a stator 216 on which a coil 214 is mounted, as shown in an exploded view and a perspective view in FIGS.
A rotor 222 having a permanent magnet 220 is disposed rotatably around one axis between the magnetic pole forming portions 218, 218 formed at the same position. Then, when the coil 214 is energized, a magnetic pole is generated in the magnetic pole forming part 218 of the stator 216, and the magnetic pole 2 set on the outer peripheral surface of the rotor 222 is formed.
24, the rotor 222 is driven to rotate by the action of the magnetic force.

More specifically, the coil 214 has a structure in which a conductive wire 228 is wound around a coil bobbin 226 having a thread winding shape. As is well known, the coil bobbin 226 is formed of a resin-based insulating material or the like, and an end plate portion that expands in a flange shape is integrally formed at both axial ends of the cylindrical portion. In particular, in the present embodiment, the tubular portion has a rectangular tubular shape, and the end plate portion also has a corresponding rectangular plate shape. A rectangular central hole 23 is formed in both end plate portions and the cylindrical portion.
0 is formed penetrating in the axial direction. In addition, the conducting wire 2
28 is an insulated wire (magnet wire) using a soft copper wire or the like
Is wound around the outer peripheral surface of the cylindrical portion of the coil bobbin 226. Then, both end lead portions 232, 2
32 is taken out from one end plate portion of the coil bobbin 226, and an alternating current is supplied to the coil 214 through these lead portions 232 and 232.

The stator 216 is composed of a pair of divided plate members 234 and 234 as a pair of divided plate members.
The divided plates 234 and 234 are formed of a magnetic material such as a silicon steel plate. In the present embodiment, in particular, a plate formed by press punching from a single plate is employed. In addition, each of the divided plate members 234 and 234 has a straight plate-shaped straight portion 236 extending linearly at a constant width, and has a central portion in the longitudinal direction of the straight portion 236 protruding in the plate width direction. A central protruding portion 238 in the shape of a rectangular plate is integrally formed. Then, the two divided plate members 234, 2 are inserted into the central hole 230 of the coil bobbin 226 from both sides in the axial direction.
The central protruding portions 238, 238 are inserted and fitted and fixed, and the central protruding portions 238, 238 are closely overlapped with each other and assembled to be mutually fixed and integrated. In addition, the core part 2 inserted through the center hole 230 of the coil bobbin 226
40 are formed. The central hole 230 of the coil bobbin 226 has a width substantially the same as the plate width of the central protruding portion 238 so that the central protruding portions 238, 238 inserted from both sides in the axial direction can be held in a mutually superposed state. And a rectangular section having a height dimension approximately twice as large as the thickness of the central projecting portion 238.

At one end of each of the divided plate members 234 and 234 in the longitudinal direction, a magnetic pole forming portion 218 having an arc-shaped opening 242 opening in the opposite direction (the plate width direction) is integrally formed. And the divided plates 234,
The magnetic pole forming portions 218 of the 234 are spaced from each other and are opposed to each other. Then, both arc-shaped openings 2
42 and 242 cooperate to form a circular frame, and a rotor housing area is formed in the circular frame. Also,
These arc-shaped openings 242 are provided with a plurality of notches 244 spaced apart in the circumferential direction.
42 are divided in the circumferential direction by the cutouts 244, so that a plurality of convex magnetic pole portions 246 each extending at a predetermined length in the circumferential direction (in the present embodiment, three at each arc-shaped opening 242). One) is formed. The circumferential length of each notch 244 is shorter than the circumferential length of the magnetic pole 246. Magnetic flux is applied to these magnetic pole portions 246 through the iron core portion 240 and the straight portion 236 by energizing the coil 214,
A magnetic pole is developed. Note that the cycle at which the magnetic poles appear corresponds to the frequency of the alternating current to be energized, and this frequency determines the rotation speed of the rotor 222 described later.

On the other hand, end protruding portions 248 protruding at a constant width in the opposite direction (plate width direction) are integrally formed at the other ends in the longitudinal direction of the divided plate members 234 and 234. I have. And, the central hole 23 of the coil bobbin 226
The central protruding portions 238, 23 of the divided plate bodies 234, 234
The end projections 248, 248 are also held in a close overlapping state by being inserted and fixedly inserted. And these end projections 248,
248 forms a short-circuit portion 250 that is magnetically and continuously connected to both sides of the iron core portion 240 independently of the magnetic pole forming portion 218 (in a different path). In particular, in the present embodiment, the magnetic pole forming part 218 and the short-circuit part 250
Are positioned substantially opposite to each other on substantially the same plane with the iron core portion 240 (coil 214) interposed therebetween.
Side and the short-circuit portion 250 side. Thereby, the unstable leakage magnetic flux when the coil 214 is energized is reduced, and the mutual influence of the magnetic field in the magnetic pole forming part 218 and the short-circuit part 250 is reduced as much as possible. The guided magnetic flux density can be obtained stably.

The straight portion 236 of one of the divided plates 234 has a central protruding portion 238 and an arc-shaped opening 242.
A step 252 having a plate thickness dimension of the other divided plate body 234 is formed between the pair of divided plate bodies 23.
4, 234 are overlapped with each other at the iron core portion 240 and the short-circuit portion 250, while the magnetic pole forming portions 218, 21
8 are opposed to each other on substantially the same plane. Also, the central projecting portion 23 of the pair of divided plate members 234 and 234
8,238 and the protruding length of the end protruding portions 248,248,
In a state where the plate motor 32 is assembled, the straight portions 236 of the pair of divided plate members 234 and 234 are
236, and the projecting length of the arc-shaped openings 242, 242 is
36, 236 is slightly shorter than half of the distance between the opposed sides.

On the other hand, the rotor 222 is provided with a thick ring-shaped plate-shaped permanent magnet 220. This permanent magnet 220
Have an outer diameter smaller than the inner diameter of the rotor housing area formed by the stator 216, and have a plurality of (in this embodiment, five pairs of (N and S poles) are set. In addition, a hollow output shaft 5 is provided in a central hole 256 of the permanent magnet 220.
4 is coaxially inserted and fixed, and the output shaft 54
Are projected axially upward from the permanent magnet 220, and the output gear 56 is integrally formed by the projected portion. The permanent magnet 220 is disposed on the central axis at the central portion of the stator 216 in the rotor housing area, and is supported so as to be integrally rotatable about the central axis. In this arrangement, the plurality of magnetic poles 224 are alternately set in the circumferential direction on the outer peripheral surface of the permanent magnet 220.
6 is opposed to the inner peripheral surface of the magnetic pole forming portion 218 in the radial direction. That is, the rotor 2
A gap is formed over the entire circumference between the magnetic pole 22 and the magnetic pole forming portion 218.

The magnetic pole portion 2 of the magnetic pole forming portion 218 is described in, for example, Japanese Utility Model Application Laid-Open No. 62-140878 and is well known.
The circumferential relative positions of the magnetic poles 224 of the rotor 222 and the magnetic poles 224 of the rotor 222 are appropriately adjusted to be non-uniform in the circumferential direction. Rotational driving force is exerted on the rotor 222 based on the magnetic action between the magnetic pole generated in the portion 246 and the magnetic pole 224 of the rotor 222, and
22 is rotated at a rotation speed corresponding to the frequency of the alternating current supplied to the coil 214. Furthermore, when the alternating current is not supplied to the coil 214, the rotor 222 rotates based on the magnetic force between the magnetic pole generated in the magnetic pole portion 246 by the power supply to the coil 214 at the next start and the magnetic pole 224 of the rotor 222. It stops at a position where a driving force can be obtained. That is,
In the plate motor 32 of the present embodiment, there is no need to provide a separate drive start unit.

The output gear 56 fixed to the rotor 222 is meshed with the gears constituting the gear train via the transmission gear 58 as described above, and the time-limit timer is provided via the gear train. The unit 34 and the cycle timer unit 36 are operated. In this embodiment, the output gear 56, the transmission gear 58, the first to seventh gears, the time cam 40, the adjustment cam 134, and the switch operation cam 13
6 and the like are all formed of a resin-based insulating material such as a non-conductive plastic or the like.

Further, the output shaft 5 of the plate motor 32
A pair of locking projections 258, 258 projecting outward in the radial direction are formed integrally with the base end of the transmission gear 58, while a non-return ring 262 is disposed below the transmission gear 58 in the axial direction. The transmission gear 58 is independently rotatable relative to the transmission gear 58 with a predetermined sliding resistance. The reverse rotation preventing ring 262 has a substantially annular plate shape as a whole, and includes a locking projection 260 that projects radially outward at one location on the circumference. When the rotor 222 of the plate motor 32 rotates in the normal rotation direction, the locking projection 260 is rotated in a direction away from the locking projection 258 of the output shaft 54, and When the rotor 222 of the plate motor 32 rotates in the reverse rotation direction while the locking projection 260 is locked to the locking projection 258 of the output shaft 54, the output shaft 54 The rotation is prevented, and the rotation is made in the normal rotation direction.

The timed timer shaft 16 including the plate motor 32 and the power transmission system 262 structured as described above
The entire operation mechanism of the cycle timer shaft 18 is incorporated in the case 264 in a housed state. As shown schematically in FIG. 7, the case 264 includes a first opening box 266 having a substantially rectangular box shape with an opening such as a lunch box, and the first opening box 266. The second opening box 268 is configured to include a second opening box 268 having a substantially rectangular box shape slightly larger than the body, and the first opening box 266 is provided on the opening side thereof. And a substantially rectangular plate-like lid 272 is overlapped with the opening of the second opening box 268, and the first and second lids are overlapped with each other. Are formed by fixing the opening boxes 266, 268 and the lid 272 to each other with bolts or the like. In particular, these first and second opening boxes 266, 268 and lid 27
Each of the members 2 is formed of a non-conductive and non-magnetic material, and each is formed of an integrally molded product of a synthetic resin material such as ABS.

Note that the first opening box 266 and the second opening box 268 have a locking piece 274 protruding from the periphery of the opening of the first opening box 266. Is locked by a locking window 276 formed in the bottom wall portion of the base member and is bolt-fixed by a bolt fixing portion 278 so as to be removably assembled. Also,
The second opening box 268 and the lid 272 are detachably attached to the four legs 280 projecting from the lid 272 by fixing bolts for fixing the lid 272 to the fixing panel 14. Has become. Note that, inside the second opening box 268, fixing bolts 284 are provided at bolt fixing portions with the lid 272, respectively.
Is protruding. Further, since the first and second opening boxes 266 and 268 and the lid 272 are assembled to each other in this manner, the first housing box 266 has a first housing area inside the case 264. 286 are formed in the second opening box body 268 in a state where the second storage areas 288 are substantially partitioned from the external space and are substantially partitioned from each other.

The first opening box 266 is provided with a pair of flat U-shaped receiving bases 254 facing each other on the opening side. A step corresponding to the thickness is provided. As shown in FIGS. 8 and 9, the plate motor 32 is accommodated in the first opening box 266, and the stator 216 is positioned at the step of the receiving table 254 of the first opening box 266. The rotor 22 is fixedly attached by being fitted to the rotor 22, and is supported by the rotor support shaft 300 and the transmission axle 302 erected on the bottom wall of the first opening box 266.
2 (output gear 56) and the transmission gear 56 are rotatably supported. A rotor support shaft 300 for rotatably supporting the rotor 222 and a transmission axle 302 for rotatably supporting the transmission gear 58 are respectively provided on the bottom wall of the first opening box 266 substantially vertically. The protruding tips of the rotor support shaft 300 and the transmission axle 302 are connected to the bottom wall of the second opening box 268 and a support piece 292 described later.
Is fixedly supported. Further, the first opening box 266 has a stepped bottom wall structure in which the depth dimension is partially different, and the housing area of the transmission gear 58 is shallower than the housing area of the plate motor 32. ing.

Further, the supporting portion of the upper end of the transmission axle 302 in the second opening box 268 is formed as an eave-shaped support piece 292 projecting into the second opening box 268.
Thereby, the small gear 62 of the transmission gear 58 projects from the transmission window 294 formed in the bottom wall of the second opening box 268 into the second opening box 268. . In short, the transmission gear 58 is provided in the first housing area 26.
6 and the second storage area 268. Further, a notch 269 for arranging the striking member 172 protruding from the bottom wall of the second opening box 268 is provided on the peripheral wall of the first opening box 266.

On the other hand, the second opening box 266 has
Book spindles 296,298,300,302,304,3
06 to 307 are fixedly erected, and the 1st to 7th wheels 62 to 76 constituting the gear train are constituted by these support shafts.
And the reduction gear 154 are rotatably supported. Further, the first support pieces 291 and 291 and the second support pieces 293 and 29
3 are fixedly mounted, and by these support pieces 291,
The fixed contact plate 42 and the movable contact plate 4 constituting the timed contact 28
The fixed contact plate 138 and the movable contact plate 140 that constitute the cycle contact 30 are supported by the second support pieces 293 and 293. Further, columns 308 and 309 are integrally protruded from a substantially central portion in the second opening box 268, and these columns 308 and 309 allow the timed timer shaft 16 to protrude.
And the cycle timer shaft 18 are rotatably supported. In addition, each said support shaft 296-30
The protruding tip of 7 is in contact with the inner wall of the lid 272, and is fixedly supported by the lid 272. In addition, a vertical wall 310 is fixedly provided inside the second opening box 268 so as to substantially partition between the arrangement region of the gear train and the arrangement region of the contact plates 138 and 140. .

In this embodiment, the first open box 2
66 and the second opening box 268, the rotor support shaft 300 and the transmission axle 302 and the support shafts 296-3 respectively protrudingly provided.
07 and the columns 308 and 309 protrude in the depth direction of the first and second opening boxes 266 and 268 in parallel with each other.

Further, the lid 272 is integrally provided with four outwardly projecting legs 280 at bolt fixing portions with respect to the second opening box 268. The fixed panel 14 and the case 264 are overlapped with the fixed panel 14 at the protruding tip surface of the fixed panel 14.
A space for disposing the rack 24 is formed between the (lid 272). In addition, lid 2
Two insertion holes 312, 313 are formed in a substantially central portion of 72, and the timed timer shaft 16 and the cycle timer shaft 18 project outward through these insertion holes 312, 313, respectively. ing.

As shown in FIGS. 1 and 2, a doorbell support 316 is formed integrally with the bottom wall of the first open box 266 so as to project outward from the outer surface.
A bowl-shaped metal doorbell 314 is screwed to the tip of the doorbell support 316. Further, the striking member 17
2 is rotatably fixed to the outer surface of the bottom wall of the second opening box 268 and disposed inside the doorbell 314. As described above, the striking member 172 is interlocked with the timed cam 40. By being driven, the striking operation is performed with the expiration of the time set in the timed timer section 34.

In the cycle timer having the above-described structure, the plate motor 32 is employed to be accommodated and disposed inside the non-conductive case member 264.
The possibility of electric shock due to contact was completely prevented, and the case 26 as a motor housing was used.
4, the ground terminal is not required, and both the simplification of the structure and the improvement of the manufacturability can be advantageously achieved. Moreover, since the plate motor 32 is covered with the case 264, invasion of foreign matter from the outside can be advantageously prevented, and damage to the plate motor 32 due to impact or the like can be effectively prevented. Can be realized.

Further, the first storage area 286 and the second storage area 288 are formed substantially in a divided manner, and the plate motor 3
2 is substantially divided from the housing area of the gear train and the like, so that adverse effects on the plate motor 32 by various members constituting the gear train and the like can be avoided as much as possible, and stable operation can be achieved. Can be realized.

Further, an area for accommodating the gear train and the like is substantially formed separately from an area for accommodating the plate motor 32 by the first opening box 266 and the second opening box 268, and both areas are formed. A case for incorporating a number of reduction gears, especially a high-speed and low-speed parallel transmission mechanism and a power amount adjustment mechanism as in the present embodiment, by arranging various gears and the like in a rotational axis direction. The internal space can be extremely advantageously secured while minimizing the size of the entire case as much as possible, and a compact time switch as a whole can be advantageously realized.

In this embodiment, the doorbell 31
4 is disposed so as to be exposed to the outside of the case 264, and
By being supported by a non-conductive resin material, it was possible to be completely independent of electric components such as the plate motor 32, the timed contact 28, and the cycle contact 30, and therefore, a metal having excellent sound volume and sound quality was obtained. The sex doorbell 314 can be employed safely and easily without the need for a ground terminal or the like.

Further, in the present embodiment, the first opening box 266 and the second opening box 268 each having a lunch box shape and the lid 272 are overlapped to form a case member 264, Bottom wall 2 of the opening box 268
By using 70 to form a partition member that partitions the first storage area 286 and the second storage area 288, simplification of the case structure and further improvement in manufacturability can be achieved. In particular, in the present embodiment, the first opening box 266 is used.
Is opened vertically upward, the plate motor 32 and the transmission gear 58 are incorporated, the second opening box 268 is superimposed on the first opening box 266, and the second opening box 268 is further attached to the second opening box 268. A series of manufacturing operations for assembling components such as a gear train, a clutch mechanism, and a contact plate, and then assembling the lid 272 to the second opening box 268 are performed by turning the first and second opening boxes 266 and 268 upside down. Therefore, it is possible to perform the assembling operation sequentially from one direction, thereby achieving extremely excellent manufacturing workability and also easily realizing automation.

In the present embodiment, in particular, the iron core portion 240 and the short-circuit portion 250 of the plate motor 32 are formed by overlapping the center projecting portions 238, 238 and the end projecting portions 248, 248 of each of the divided plate members 234, 234. Since there is no need for caulking or bonding for forming the stator 216, the stator 216 can be manufactured more easily. Further, in the present embodiment, the split plates 234 and 234 are assembled and held using the central hole 230 of the coil bobbin 226, so that the combined structure is further simplified and the assembly is facilitated. Can be realized. In particular, the coil bobbin 226 of the coil 214 is formed in a rectangular cylindrical shape, and the center projecting portions 2 of the pair of divided plate members 234 and 234 are formed.
38, 238 are overlapped with the central hole 23 of the coil bobbin 226.
There is an advantage that it can be easily fitted into the zero.

Further, in the present embodiment, when the coil 214 of the plate motor 32 is energized, the rotor 2
22 is rotated, where the self-inductance in the coil 214 is increased by the iron core portion 240 and the short-circuit portion 250, so that the coil 21 is rotated.
4 is suppressed. As a result, the coil 214
, The number of turns of the coil can be reduced while satisfying the required limit of the amount of generated heat.
2 is achieved. In addition, since the number of turns of the coil can be reduced, it is possible to advantageously avoid a trouble such as disconnection at the time of winding the conducting wire 228. In addition, since it is not necessary to add another member such as a capacitor in order to suppress the flowing current, the structure is simple, the manufacturability is excellent, and the cost is advantageous.

Since the short-circuit portion 250 and the magnetic pole formation portion 218 are formed as separate circuits, the short-circuit portion 250
As a result, the adverse effect on the driving force of the rotor 222 due to the formation of is reduced as much as possible, and stable motor operation and output are exhibited. In particular, in the present embodiment, the short-circuit portion 250 and the magnetic pole forming portion 218 are arranged on substantially the same side with the iron core portion 240 (coil 214) interposed therebetween, so that the leakage magnetic flux can be more efficiently reduced. Short circuit 250
And further stabilization of the magnetic flux and thus the operation can be achieved.

Particularly, in the present embodiment, in the plate motor 32, the magnetic pole forming portion 2
By forming the short-circuit portion 250 on the side opposite to 18, the height of the plate motor 32 can be sufficiently reduced in addition to the magnetic effect, so that the first housing area 286 can be reduced, and Further downsizing of the time switch 10 is realized.

Although the embodiments of the present invention have been described in detail above, they are merely examples, and the present invention is not to be construed as being limited by specific descriptions in the embodiments.

For example, the cycle switch mechanism, the doorbell, the high-speed / low-speed transmission mechanism and the like in this embodiment are appropriately adopted according to the required characteristics of the time switch, and are not necessarily provided.

The transmission gear employs a gear as exemplified above, and a pinion fixed to the rotor of the plate motor is disposed so as to protrude into the second housing area, so that the transmission gear is constituted by the pinion. It is also possible.

The arrangement positions of gears, clutch mechanisms, operation shafts and the like are not limited at all.

Further, the shape of the case is not limited to a specific shape such as a box shape as in this embodiment. Further, a ventilation hole for cooling may be formed in a case in which the plate motor is provided.

It goes without saying that the present invention can be applied to a time switch other than the microwave oven of the embodiment.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be performed in embodiments, and unless such embodiments depart from the spirit of the present invention.
Both are included in the scope of the present invention,
Needless to say.

[0072]

As is clear from the above description, in the time switch having the structure according to the present invention, in addition to the use of the plate motor having the specific structure, the case of the specific structure made of a non-conductive material is employed. In the case, the housing area for the plate motor and the housing area for the gear train and the like are formed by being substantially partitioned, so that the ground terminal in the case as the motor housing is not required, thereby simplifying the structure. In addition to the improvement in manufacturability, the adverse effects on the plate motor by various members constituting the gear train and the like can be avoided as much as possible, and stable operation can be realized.

[Brief description of the drawings]

FIG. 1 is a front view showing an operation unit for a microwave oven having a time switch according to an embodiment of the present invention.

FIG. 2 is a left side view in FIG.

FIG. 3 is an explanatory view for assembling the operation unit shown in FIG. 1;

FIG. 4 is an exploded explanatory view of a driving system of the time switch shown in FIG. 1;

FIG. 5 is an exploded view of a plate motor used in the time switch shown in FIG. 1;

FIG. 6 is a perspective view of the plate motor shown in FIG. 5;

FIG. 7 is an explanatory view for assembling a case member according to the embodiment.

FIG. 8 is a plan view showing a state in which the plate motor shown in FIG. 5 is housed in the case.

9 is a partially cutaway front view of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 time switch 28 timed contact 30 cycled contact 32 plate motor 33 power transmission system 34 timed timer unit 36 power adjustment timer unit 58 transmission gear 214 coil 216 statuser 218 magnetic pole forming unit 220 permanent magnet 222 rotor 224 magnetic pole 270 bottom wall 286 first storage area 288 second storage area

Claims (8)

[Claims] Claims: 1. A housing which is accommodated and arranged in a non-conductive case,
A timed cam mechanism capable of adjusting and setting a timed time, which cuts off a timed contact provided in the case, is operated by a drive motor via a reduction gear train housed and arranged in the case. In the time switch, a first accommodating area and a second accommodating area, which are positioned with a partition plate interposed therebetween, are formed inside the case. A plate motor in which a rotor having a plurality of magnetic poles set on the outer peripheral surface by a permanent magnet is disposed for a magnetic pole forming portion of a stator made of a magnetic material, and the plate motor is housed and arranged in the first housing area. On the other hand, in the second housing area, the reduction gear train, the timed cam mechanism, and the timed contact are housed and arranged, and a straddle is provided between the first housing area and the second housing area. A time switch, comprising: a transmission gear that is provided to transmit the rotational driving force of the plate motor to the reduction gear train. 2. The time-reduction gear train includes a high-speed gear train for operating the timed cam mechanism at a high speed, and a low-speed gear train for operating the timed cam mechanism at a low speed. A speed switching mechanism for selectively operating the high-speed gear train and the low-speed gear train according to a time limit in the mechanism, and the speed switching mechanism is housed and arranged in the second housing area. 2. The time switch according to 1. 3. A cycle contact, and a cycle cam mechanism driven by the plate motor to cut off the cycle contact in a predetermined cycle, and the cycle contact and the cycle cam mechanism are connected to the second contact. 3. The time switch according to claim 1, wherein the time switch is accommodated in the second accommodation area. 4. A doorbell which is fixed to the case by exposing the doorbell to the outside, a tapping member for ringing the doorbell is protruded outward from the case, and the tapping member is connected to the timed contact. 2. A bell mechanism, which is driven in conjunction with disconnection of the vehicle, is provided in the second housing area.
4. The time switch according to any one of claims 1 to 3. 5. A case wherein the case comprises a first opening box forming an outer wall and a peripheral wall of the first storage area, and a second opening box forming the partition and a peripheral wall of the second storage area. The time switch according to any one of claims 1 to 4, wherein the time switch is divided by a lid and a lid that covers an opening of the second opening box and forms an outer wall of the second housing area. 6. The stator according to claim 1, wherein the stator is constituted by a pair of divided plate members, and the pair of plate members are fixed to each other by being fitted into a central hole of the coil from both sides in the axial direction. The time switch according to any of the above. 7. The plate motor according to claim 1, wherein a short-circuit portion for mutually magnetically connecting both side portions of the coil in the stator is formed independently of the magnetic pole forming portion. Time switch. 8. The stator is constituted by a pair of plate-like divided bodies combined with each other from both sides in the axial direction of the coil, and the pair of plate-like divided bodies is fitted into the center hole of the coil from both sides in the axial direction. The magnetic pole formation portion is formed by placing the pair of plate-shaped divided bodies on one side in the direction perpendicular to the axis of the coil and forming the magnetic pole forming portion, while the other side in the direction perpendicular to the axis of the coil. The time switch according to claim 7, wherein the short-circuit portion is formed by overlapping the pair of plate-shaped divided bodies on the side.