JP2002279879A - Time switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe time switch for a washing machine which does not generate short circuit due to tracking between exterior connection terminals. SOLUTION: A separated cam 38 is provided free in turning integrally with a main shaft 15, and at an original position where the separated cam 38 returns after setting time is finished, a following part 391 of a separated lever 39 rides on a high-stepped part of an outer periphery of the separated can 38 so that the separated lever turn. Switch levers 30, 31 are simultaneously pressed and moved by an operating part 392 of the separated lever to shun contact with an operating cam 26 as well as to have mobile contact point plates 27, 28 separated forcefully from a fixed contact point plate 29, so as to break circuits of contact points 271, 281, simultaneously. Terminals 112, 113 which might be a cause for tracking are securely separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time switch programmed to alternately switch two circuits periodically, and more particularly to a timer structure suitable for a washing machine.

[0002]

2. Description of the Related Art Conventionally, a reversing time switch 10 for a washing machine.
0, as shown in FIG. 7, comprises two types of switches: an inversion switch 101 for controlling an inversion time for periodically inverting the washing tub, and a main switch 102 for controlling the entire washing time. A reversing lever 101b operated by a reversing cam 101a driven by a mainspring accumulating force of a mainspring type timer mechanism T opens and closes a reversing switch 101, and is incorporated into a main shaft 103 which is also rotated by the mainspring drive at the end of a set time. When the stop contact member 105b urged by the leaf spring 105 enters the low step portion 104a of the stop cam 104, the movable contact 106a provided on the leaf spring 105 separates from the fixed contact 106b,
In this configuration, the main switch 102 is turned off.

[0003]

However, in this conventional example applied to a washing machine, the terminal 107 is not used.
Since a and 107b are arranged directly near the terminal block 108 by insert molding, there is a possibility that water or fiber debris accumulates to cause an unexpected short circuit (tracking), which may cause a fire. For this reason, consideration must be given to strengthening the heat resistance of the terminal block 108 and making it flame-retardant, but this does not necessarily eliminate tracking.
In addition, since two types of switches are built in, it is inevitable that the manufacturing cost is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a safe time switch by eliminating the tracking by integrating an inversion switch and a main switch into one switch, and to reduce the manufacturing cost.

[0005]

In order to achieve the above object, a time switch according to the present invention basically comprises a switch lever for operating a switch member for switching a predetermined operation, and an actuation of the switch lever. An operation cam, a separation lever that separates the switch lever from the operation cam to maintain the switch member in an off state, a separation cam that operates the separation lever, and the operation cam that are separate from the operation cam. And a timer mechanism for setting the operation time of the separation cam.

At the end of the operation time set by the timer mechanism, the separation lever is operated by the separation cam and the switch lever is separated from the operation cam to turn off the switch member. To terminate the predetermined operation. In this way, by using the switch member that performs switching of the predetermined operation as the end switch, the configuration is simplified and the number of components is reduced.

In such a time switch, the operation of the operation cam and the separation cam is driven by one drive source, and a spring is used as the drive source. Further, the timer mechanism has a speed adjusting means for adjusting a relaxation speed of the mainspring, and a stopping means for restraining the speed adjusting means at the end of a set operation time and stopping all operations. If the output torque is weak, such as a mainspring, and there is a concern that the mainspring will stop in the middle of operation, not providing an end switch is advantageous because the load for operating this switch is reduced. .

The stop means comprises a stop cam provided coaxially with the separation cam and a stop piece member for restraining the speed adjusting means by the action of the stop cam. The member is made of a conductive elastic material, and the extended portion is used as one external connection power supply terminal.

The switch member for switching the predetermined operation is constituted by a movable contact plate and a fixed contact plate, and is disposed on the opposite side of the stop contact member via a time setting operation main shaft. A fixed circuit for supplying electricity to the fixed contact plate from a connection power supply terminal was provided. Tracking is eliminated because the externally connected power supply terminal of the fixed contact plate and the externally connected power supply terminal of the movable contact plate are arranged at separate positions.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a time switch according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a time switch 10 according to the present invention, FIG. 2 is a sectional view developed along a line II-II in FIG. 1, and FIG. 3 is an exploded perspective view. The time switch 10 is configured such that a first resin frame 11 that houses and supports a mechanical unit and a second machine frame 14 that forms a barrel 13 that houses a mainspring 12 serving as a driving source are fitted with each other at their outer edges. An outer shell is defined by a box to be formed (see FIG. 2), and external connection terminals 112, 113, 114 of electric wiring are separated by a waterproof wall 111 formed on the first machine casing 11.
Is arranged.

A bearing hole 116 for pivotally supporting the main shaft 15 extends through substantially the center of the first machine casing 11, and a bearing boss 11 for rotatably supporting the stop cam 16 on the outer periphery of the bearing hole 116.
7 protrude inward. One end of the main shaft 15 is inserted through the bearing hole 116 below the paper surface, protrudes to the outside of the first machine casing 11, and has a time setting knob (not shown). The other end of the main shaft 15 is rotatably supported by the second machine casing 14 at the upper side of the paper surface, and a resin main gear 17 is frictionally connected to the vicinity of this end, so that torque can be transmitted within the range of frictional force. Will be

That is, the main gear 17 has the protruding portion 1
An engaging concave portion 172 having a friction member 71 is formed.
4 forms a friction clutch that transmits rotation only when it comes into contact with the protrusion 171 of the main gear 17. The hook provided on the boss of the main gear 17 is engaged with a through-hole formed at the start end of the mainspring 12, and
And the main shaft 15.

A resin pinion 18 meshing with the main gear 17
Engages the ratchet pawl at the tip of the elastic arm integrally formed with the ratchet internal teeth of the resin large gear 19 coaxial with the pinion 18 to form a one-way clutch. That is, the spindle 1
5, when the spring 12 is wound up and stored, the rotational force of the pinion 18 is not transmitted to the large gear 19,
When the main shaft 15 is rotated in the opposite direction by the urging force of 2, the rotational force of the pinion 18 is transmitted to the large gear 19.

When the accumulating force of the mainspring 12 slowly drives the pinion 18 via the main gear 17 in the direction opposite to the winding direction of the mainspring, the resin gear 22 is driven at a high speed via the speed increasing gear train 20. Rotate. The ratchet of the gantry 22 is rotatably supported by a shaft 118 erected on the first machine frame 11 and engages with an inertia pendulum 23 and an integrated pallet 24. The inertial pendulum 23 is reciprocated by rotation in one direction of the goose wheel 22 to adjust the speed at which the speed-up gear train 20 and the main shaft 15 rotate in the direction in which the mainspring 12 rewinds. That is, the large gear 19 and the speed increasing gear train 2
0, gangi wheel 22, and inertia pendulum 23, timer mechanism 2
5 are formed.

On the other hand, the speed increasing gear train 2 with which the large gear 19 meshes
The operation cam 26 is coaxially connected to the 0 first gear 201 and rotates integrally with the first gear 201. Operation cam 26
Is a multi-layer cam in which four layers of cylindrical cams 261, 262, 263, 264 having different height patterns on the outer periphery are laminated in the axial direction, and is formed by integral molding of resin (see FIGS. 2 and 3).

Among them, the cylindrical cams 261 and 263 are first cylindrical cam pairs whose outer peripheral surfaces are paired in the same height pattern whose phase is shifted by 60 °. Cylindrical cams 262 and 264 have outer peripheral surfaces whose phase is shifted by 60 °. This is a second pair of cylindrical cams that form a pair with the same shape of height pattern. First cylindrical cam pair 261 and 263
In the height pattern, most of the equally divided outer peripheral surface is a high step portion, and the remaining three portions are low step portions. In the height pattern of the second pair of cylindrical cams 262 and 264, about half of the outer peripheral surface divided into three equal portions is formed in a high step portion and the remaining half is formed in a low step portion. In addition, the cylindrical cams 261 and 262 are formed in the same phase, and the cylindrical cams 263 and 264 are formed in the same phase.

The first machine frame 11 has a terminal block 1 to which a base of a plurality of contact plates 27, 28, 29 constituting an elastic and switch member for switching a predetermined operation is fixed.
15a and 115b are fixed by press fitting. The contact plate 29 is a fixed contact plate, and the tip is bent at a right angle in a direction crossing the other contact plates 27 and 28 in the width direction.
Two contact points 291 are fixed at a position facing 28. The contact plates 27 and 28 are movable contact plates.
Are fixed (see FIGS. 1 and 3).

The first cylindrical cam pair 261 and 262 of the operation cam 26
The driven portion 301 at the tip of the switch lever 30 constituting the first cam follower selectively slides on one of the upper cylindrical cams 261 and 262 of the pair 63 and the second cylindrical cam pair 262 and 264. 263, 264, the switch lever 3 constituting the second cam follower
The driven portion 311 at one end selectively slides. Each driven part 3
01 and 311 are the first cylindrical cam pair 26 of the operation cam 26.
Which of the pair of cylinders 1 and 263 and the pair of second cylindrical cams 262 and 264 is in sliding contact is selected by a cam surface switching unit described later. That is, when the driven portion 301 faces the cylindrical cam 261, the driven portion 311 always faces the cylindrical cam 263, and when the driven portion 301 faces the cylindrical cam 262, the driven portion 311 always faces the cylindrical cam 264.

Each of the switch levers 30 and 31 is
The shaft holes formed in 2 and 312 are loosely fitted to the lever shaft 119 erected on the first machine casing 11, and individually swing around the lever shaft 119 following the rotation of the operation cam 26. Each of the switch levers 30 and 31 has a driven portion 301 and 311 respectively.
When the switch levers 30 and 31 swing by following the operation cam 26, the contact plate operation units 303 and 313 move the movable contact plates 27 and 28, respectively. To push.

When one of the driven parts 301 and 311 faces the lower step of the operation cam, the movable contact plate 2
One of the contacts 271 and 281 is a fixed contact 2
Although the electric circuit is closed by contact with 91, the driven portions 301 and 311 of the switch levers 30 and 31 do not face the low step portion of the operation cam 26 at the same time. In addition, the driven parts 301,
When 311 faces the high step of the operation cam, the contacts 271 and 281 of the linked movable contact plates 27 and 28 are separated from the fixed contact 291 to open the electric circuit.

Curved portions 304, 314 having concave surfaces on the operation cam 26 side are formed on the switch levers 30, 31, respectively.
Engagement protrusions 305 and 315 are provided on the concave side, respectively. On the other hand, the base 3 of each switch lever 30, 31
The holding cover 32 is externally inserted into the lever shaft 119 so as to fit the 02 and 312, and the bases 302 and 312 are sandwiched between the upper end plate 321 and the lower end plate 322 of the holding cover 32 (see FIG. 2). The outer peripheral surface of the holding cover 32 is partially cut away to form a lever window 323, and the base portions 302 and 312 are formed.
Switch levers 30 and 31 into which are inserted and fitted
Extends from the lever window 323. Lever window 323
Are formed so as not to interfere with the swinging of the switch levers 30, 31.

The lever shaft 119 is provided below the lower end plate 322 of the holding cover 32 with a cam 33 having a fan-shaped planar shape.
Through the arc-shaped long hole 331. The cam 33 has a cylindrical shaft portion 332 formed integrally with a portion corresponding to the pivot of the fan.
The lower end of the shaft support 1 that is integrally provided with the first machine casing 11
20 and is supported rotatably about the shaft support 120 by penetrating the upper end through a through hole provided in the second machine casing 14. In addition, a base of an external operation lever 34 that can be manually operated from the outside is prevented from rotating and fitted and fixed to an upper end of the shaft portion 332 that is penetrated and protrudes from the second machine frame 14 (see FIG. 3).

As shown in FIG. 2, the shaft portion 332 is located on the concave surface side of the curved portions 304, 314 of the switch levers 30, 31. An engagement rib 334 is formed on the outer periphery of the shaft portion 332 so as to extend along the axial direction and protrude in the radial direction. When the external operation lever 34 is manually operated to rotate the shaft portion 332, the engagement rib 334 causes the switch lever 30,
31 at the same time as the two engaging projections 305, 315, and by further rotation, the engaging rib 334 is brought into contact with the two engaging projections 305, 315.
To rotate the switch levers 30 and 31 simultaneously,
The driven portions 301 and 311 are separated from each other to a position where the driven portions 301 and 311 break contact with the operation cam 26. Further, by rotating the shaft portion 332, both the engagement protrusions 305, 315 are separated from the engagement rib 334, so that the switch levers 30, 31 are rotated by the elastic urging force of the movable contact plates 27, 28. Then, the driven portions 301 and 311 return to the contact positions where they can be driven by the cylindrical surface of the operation cam 26.

The end of the fan-shaped cam 33 has a shaft support 12
A long hole 331 is formed along an arc centered at 0, and the rotation range of the sector cam 33 is restricted by the lever shaft 119 passing through the long hole 331. A cam surface 335 having an axial lift is formed around the long hole 331. The cam surface 335 has a height difference at both ends and has a high step portion 336.
And the low step portion 337 are smoothly connected by an intermediate inclined surface 338.

The lower end plate 322 of the holding cover 32 is
35, and is pressed by the urging force of a compression coil spring 35 interposed between the upper end plate 321 of the holding cover 32 and the second machine frame 14. When the external operation lever 34 is turned, the fan-shaped cam 33 turns integrally, and the cam surface 335 with which the lower end plate 322 of the holding cover 32 slides is inclined.
The switch is switched to the high step portion 336 or the low step portion 337 via 38, and the holding cover 32 and the switch levers 30 and 31 in the holding cover 32 move up and down along the lever shaft 119 in cooperation with the coil spring 35.

When the lower end plate 322 of the holding cover 32 is in contact with the high step portion 336 of the fan-shaped cam 33, the switch levers 30, 31 are on the upper side against the urging force of the coil spring 35, and 31 driven parts 301 and 3
11 is a first cylindrical cam pair 261 and 263 of the operation cam 26.
Confront each other. The lower end plate 3 of the holding cover 32
When the block 22 is in contact with the low step portion 337 of the sector cam 33, the switch levers 30 and 31 are at the lower position by the urging force of the coil spring 35, and the driven portions 301 and 311 of the switch levers 30 and 31 are 2nd cylindrical cam pair 2
62 and 264, respectively.

During the rotation operation of the external operation lever 34,
As described above, the engaging rib 334 of the shaft portion 332 is
05 and 315, the switch levers 30 and 31 are pivoted to a range where they do not come into contact with the operation cam 26. Therefore, when the driven portions 301 and 311 move in the axial direction of the operation cam 26,
There is no interference between the step portions of the cylindrical cams 261, 262, 263, 264. A guide rib 324 that fits into a guide groove 121 formed in the first machine casing 11 is provided on the outer periphery of the holding cover 32 in the axial direction so as to protrude.
21, and is non-rotatably supported around the lever shaft 119.

The components including the external operation lever 34, the fan-shaped cam 33, and the holding cover 32 are provided with switches 36 and 37 for controlling the cyclic repetitive operation. A state in which the on / off control is performed in the pattern of the cam pair 261 and 263, and the second cylindrical cam pair 2
A cam surface switching means for switching between the on / off control in the patterns of 62 and 264 is provided. Then, the switch levers 30, 31 move up and down within the range of the width of the movable contact plates 27, 28.

A separation cam 38 is fitted on the main shaft 15 separately from the operation cam 26, and is fixed so as to rotate integrally. On the other hand, a separation lever 39 is rotatably supported by a support shaft 122 erected on the first machine casing 11 and is in sliding contact with the outer peripheral surface of the separation cam 38. The separation lever 39 has a triangular driven portion 391 that contacts the separation cam 38 and an operation portion 392 that can simultaneously contact both the switch levers 30 and 31 and move them out of the operation area by the operation cam 26. , A rotation center hole 393 through which the support shaft 122 passes.

When the driven portion 391 rides on the high step portion 381 of the separation cam 38, the separation lever 39 operates.
2 separates the switch levers 30 and 31 from the operation cam 26 at the same time. With this operation, the switch levers 30 and 31 forcibly separate the movable contact plates 27 and 28 from the fixed contact plate 29 against the elasticity of the movable contact plates 27 and 28, and contact the fixed contact 291 and the movable contacts 271 and 281. Disable.
By this action, the motor 40 connected to the external connection terminals 112, 113, 114 stops.

On the other hand, when the driven portion 391 of the separation lever comes into sliding contact with the low step portion 382 of the separation cam 38, the switch levers 30 and 31 are released and are free to the first pair of cylindrical cams 261 and 263 of the operation cam 26 or Second cylindrical cam pair 262,
264, the contact with the selected side is restored, for example, the driven portion 301 of the switch lever 30 is
1, the movable contact 271 is brought into contact with the fixed contact 291 for a while and the motor 40 is rotated clockwise, for example, and then the driven portion 301 is pushed up by the high step of the cylindrical cam 261 to fix the movable contact 281. The motor 40 is stopped after moving away from the contact 291.

Next, the driven portion 311 of the switch lever 31 located at the high step of the cylindrical cam 263 falls into the low step, and the movable contact 272 contacts the fixed contact 291 to change the circuit configuration. Flip counterclockwise. The movable contact 272 is separated from the fixed contact 291 by the transition of the driven portion 311 to the high step portion, and the motor 40 stops. Next, the switch lever 3 that has fallen into the low step portion of the cylindrical cam 261
At 0, the clockwise rotation circuit of the motor 40 shifts from ON to OFF, and the first cylindrical cam pair 261 and 263 or the second cylindrical cam pair 262 and 26
The driven sections 301 and 311 follow the high step section and the low step section of No. 4 and this operation is repeated. Reference numeral 41 denotes a capacitor which is involved in setting the rotation direction of the motor 10.

The stop cam 16 fitted on a bearing boss 117 projecting from the outer periphery of a bearing hole 116 into which the main shaft 15 is inserted in the first machine casing 11 is overlapped with the center axis of the main shaft 15 as a common rotation center. Have been. The stop cam 16 has a cam surface including a high step portion 161 occupying most of the outer periphery and a low step portion 162 formed in a part of the outer periphery, and a center hole 163 along the outer periphery of the bearing boss 117 of the first machine casing 11. And an engagement recess 164 formed by cutting out a part of the center hole 163 (see FIG. 3).

When the key 383 projecting from the lower part of the collar extending from the separation cam 38 is fitted into the engagement concave portion 164, the separation cam 38 and the stop cam 16 are interlocked with each other. A circumferential play is provided between the key 383 and the engaging concave portion 164 so that the key 16 can rotate relatively within a predetermined range. Therefore, when the main shaft 15 rotates, the separation cam 38 rotates first and the stop cam 16 does not rotate until the key 383 presses the end of the engagement recess 164. After the key 383 is engaged with the end of the engagement recess 164, the cams 38 and 16 rotate integrally.

When the two cams 38 and 16 are overlapped, the function positions of the high step portion 381 of the separation cam 38 and the low step portion 162 of the stop cam 16 overlap almost synchronously. That is, the stop cam 16 stops the timer mechanism 25 immediately after the separation cam 38 stops the motor 40 in advance. on the other hand,
Stopping contact piece member 42 fixed to the tip of a leaf spring 44 whose base is fixed to the terminal block 115a by insert molding.
Is pressed against the stop cam 16 by the urging force of the leaf spring 44 and is in sliding contact therewith. When the stop contact member 42 is in sliding contact with the high step portion 161 of the stop cam 16, the tip of the leaf spring 44 is Separated from the pin 231 of the inertial pendulum 23, the inertial pendulum 23 is capable of regular free vibration, and has a main shaft 15 and an operation cam 26.
Is maintained at a predetermined rotation speed.

The separation cam 38 rotates together with the main shaft 15 at a speed controlled by the timer mechanism 25, and the driven portion 391 of the separation lever 39 is pressed against the high step portion 382 of the separation cam 38 at the lower limit of the accumulating force of the mainspring 12. The switch is pushed up, the switch levers 30 and 31 are pushed, the motor circuit is turned off, and the motor 4 is turned off.
Stop 0. Simultaneously with this time or after a slight time lag, the stop contact piece member 42 falls into the low step portion 162 of the stop cam 16 which rotates integrally with the separation cam 38, and the distal end portion 441 of the leaf spring 44 becomes the inertial pendulum. 23, and regulates the swing of the inertial pendulum 23 by contact with the pin 231 of the
5 is stopped.

The leaf spring 44 is formed of a conductive material, one of which is used as an external connection power supply terminal 112, and the internal connection terminal 112a is projected in a perpendicular direction and fixed to the terminal block 115a by insert molding. The internal connection terminal 112a protruding from the upper surface of the terminal block 115a is cut out from the upper part to press-fit the end of the fixed contact plate 29 to make it electrically conductive (FIG. 3).
reference). The fixed contact plate 29 is made of a conductive material thicker than the external connection power supply terminal 112, extends to a position facing the movable contact plates 27, 28, and operates together with the movable contact plates 27, 28 to operate the operation switches 36, 37. Is configured.

Since the operation switches 36 and 37 are located on the side opposite to the stop piece 42 via the main shaft 15, the external connection power supply terminals 113 and 114 of the movable contact plates 27 and 28 are provided.
Are located at a sufficient distance from the other external connection power supply terminal 112, which is the extension of the leaf spring 44 of the stop contact member 42, and tracking does not occur between these terminals.

Next, the operation of the time switch 10 will be described. First, the spindle 1 is operated by a knob (not shown).
5 to rotate the projection 174 of the friction plate 173 to the main gear 17.
After rotating the mainspring 12 sufficiently by rotating it by about 300 °, the required time is set in accordance with the scale while returning the knob. At this time, the main gear 17 does not rotate due to the friction clutch, but only the main shaft 15 rotates, and the displacement angle from the original position becomes a set time limit. That is,
The main shaft 15 is driven by the mainspring within the set angle range and returns to the original position.

In this process, the accumulating force of the mainspring 12 drives the speed increasing gear train 20 to rotate, and the operation of the timer mechanism 25 causes the main shaft 15 to rotate at a constant speed in a direction opposite to the winding direction of the mainspring. Further, by setting the rotation angle of the main shaft 15, the separation cam 38 is also displaced by the same angle, the driven portion 391 of the separation lever 39 abuts on the low step portion 382, and the switch levers 30, 31 First cylindrical cam surface pair 261 and 263 or second cylindrical cam surface pair 26
2,264 can be followed. Separation cam 38
Rotates with the rotation of the main shaft 15 from the set displacement position toward the original position.

The operation cam 26 which rotates coaxially and integrally with the first gear 201 of the speed increasing gear train 20 is driven to rotate at a relatively high speed. When the operation cam 26 rotates, the surface of the operation cam 26 where the driven portions 301 and 311 of the switch levers 30 and 31 face each other alternately switches between a high step portion and a low step portion, and the driven portions 301 and 311 are switched to the high step portion. Switch 3 when confronting
When the driven parts 301 and 311 face the lower step, the switches 36 and 37 are turned on.

Here, as shown schematically in FIG. 4 (a), a weak water flow is selected by the external operation lever 34, and the driven portions 301, 311 of the switch levers 30, 31 become the first cylindrical cam of the operation cam 26. When facing the pair of surfaces 261 and 263, the switch 36 and the switch 37 have a phase difference of 6 due to the configuration of the first pair of cylindrical cam surfaces 261 and 263 described above.
The on / off operation is alternately repeated at 0 °. In this case, since the operation time of the motor 40 within the set time is short and the stop time is long, the washing is performed by the weak water flow.

On the other hand, when the strong water flow is selected by rotating the external operation lever 34, the lower end plate 322 of the holding cover 32 abuts on the low step portion 337 of the sector cam 33 and the switch lever 3
0 and 31 move downward, and the driven portions 301 and 311 face the second pair of cylindrical cam surfaces 262 and 264 of the operation cam 26, respectively. Also in this case, the two switches 36 and 37 are alternately turned on and off at regular intervals by the rotation of the operation cam 26, but the high step portion of the second pair of cylindrical cam surfaces 262 and 264 has a central angle of about 70 °. Provided, and the low step part has a central angle of about 5
Since the motor 40 is provided in the range of 0 °, the motor 40 alternates the forward rotation operation and the reverse rotation operation for a relatively long time with a relatively short off-time corresponding to an interval of 10 ° corresponding to a phase difference of 60 ° between the cams. Repeat. As described above, since the operation time of the motor 40 within the set time is long and the stop time is short, washing is performed by strong water flow.

As shown schematically in FIG. 4B, when the separation cam 38 returns to the original position after the set time has elapsed, the separation lever 39 moves the driven portion 391 to the high step portion 381 of the separation cam 38. The operation part 392 is pushed up and turned, and the operation part 392 comes into contact with the back surfaces of the switch levers 30 and 31 to be pushed at once, and comes into contact with the operation cam 26 pressed by the elastic urging force of the movable contact plates 27 and 28. Sever. With this operation, the switch lever 30,
31 forcibly bends the movable contact plates 27 and 28 at the same time against the elastic force thereof, prevents contact between the movable contacts 271 and 281 and the fixed contact 291, and turns off the electric circuit.

At the same time or immediately thereafter, the stop contact member 42 falls into the low step portion 163 of the stop cam 16 which has returned to the original position by the action of the leaf spring 44, and the tip end of the leaf spring 44 is moved to the inertia pendulum 23. Of the inertia pendulum 2
By stopping the swing of 3, the timer mechanism 25 is stopped.

FIG. 5 shows a second embodiment of the present invention, which shows another embodiment of the stop piece. The same reference numerals are used for members common to the first embodiment. That is, the stop contact piece member 45 is formed of resin, and its base 451 is pivotally supported by the bracket 43 protruding from the terminal block 115a, and is urged by the deformed leaf spring 46 to thereby stop the stop contact piece member 45. Stop follower 452 to stop cam 1
6 is pressed against the cam surface. Then, the low step portion 16 of the stop cam 16 that has returned to the original position when the operation of the timer mechanism 25 ends.
When the driven portion 452 of the stop contact piece member 45 intrudes into the second member 2, the distal end portion 461 of the deformable leaf spring 46 suppresses the movement of the pin 231 of the inertial pendulum 23 and stops the timer mechanism 25.
The fixed contact plate 29 is formed of a plate material having a constant thickness up to the external connection terminal 112 and is press-fitted into the terminal block 43 without being insert-molded, so that a molding die of the terminal block 43 can be simplified.

FIG. 6 shows a third embodiment, which is another embodiment for a separation cam. As in FIG. 5, members common to the first embodiment are denoted by the same reference numerals. That is, the auxiliary cam 47 having the central axis line of the main shaft 15 as a common rotation center is interposed between the auxiliary cam 47 and the separation cam 38 so as to overlap the upper surface of the stop cam 16, and the support shaft 122 erected on the first machine casing 11 is moved. The auxiliary lever 48 that rotates about the center is urged by the torsion coil spring 49 to face the auxiliary cam 47. The auxiliary cam 47 occupies most of the outer periphery at the high step,
The low step portion 4 is located at a position synchronized with the high step portion 381 of the separation cam 38.
71 is formed. Instead of the torsion coil spring 49, a U-shaped leaf spring or a compression coil spring may be used.

A part of the center hole 472 through which the main shaft 15 of the auxiliary cam 47 is inserted is cut out to form an engagement recess 473, which is engaged with a key 474 projecting below the separation cam 38. Then, a key (not shown) protruding from the lower surface side of the auxiliary cam 47 is engaged with the engagement concave portion 164 of the stop cam 16. When the separation cam 38 and the auxiliary cam 47 are overlapped,
The key 474 of the separation cam 38 is engaged with the engagement recess 4 of the auxiliary cam 47.
73, the two cams 38, 47 hold each other,
In this state, play is provided between the key 474 and the engaging recess 473 so that the cams 38 and 47 can rotate relative to each other within a predetermined range.

Accordingly, the key 474 of the separating cam 38 which rotates together with the main shaft 15 pushes the end of the engaging recess 473, and the auxiliary cam 47 rotates integrally. However, the auxiliary cam 47 returns to the original position at the end of the set time. Auxiliary lever 4 at low step 471
8 in the first process in which the driven portion 481 is engaged, the elastic urging force of the torsion coil spring 49 urging the auxiliary lever 48 forcibly turns the auxiliary lever 48, and the key 348 and the engagement concave portion 473 The auxiliary cam 47 is rapidly turned in a snap action by the play provided between the auxiliary cams 47. The turning operation is further ensured by the inertial force due to the rapid operation.

The auxiliary lever 48 which rotates rapidly under the bias of the torsion coil spring 49 is provided with the separating cam 3.
8 assists the rotation of the switch levers 30 and 31.
With this operation, the stop cam 16 also returns to the original position and stops the timer mechanism 25. This is because when the stored power of the mainspring 12 is mostly released near the end of the set time, the rotating force of the separation cam 38 by the mainspring 12 is insufficient, and the elastic force of the movable contact plates 27 and 28 is resisted. As a result, it is possible to overcome the risk of lacking the ability to push the switch levers 30, 31 to the high step portion 381, and to guarantee the operation of turning off the switches 36, 37 reliably.

Although not shown, as a fourth embodiment, in such a configuration, a plurality of high step portions 3
81 are provided at appropriate intervals, and the switch 36,
It is also possible to turn on / off 37 at the same time and operate the motor 40 intermittently. That is, when used in a washing machine, a program for a pickling function can be added.

[0052]

As is apparent from the above description, according to the time switch of the present invention, since the inversion switch and the main switch are integrated, the switching circuit is simplified and the input power supply terminals are separated. The occurrence of tracking can be eliminated, and safety can be improved. Further, the number of electric components to be insert-molded can be reduced, and the mold can be simplified.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of a time switch according to the present invention.

FIG. 2 is a developed sectional view taken along the line II-II of FIG.

FIG. 3 is an exploded perspective view of the first embodiment of the time switch according to the present invention.

FIGS. 4A and 4B are partial plan views schematically showing the operation of the time switch according to the present invention, in which FIG.

FIG. 5 is a partial plan view schematically showing a second embodiment of the time switch according to the present invention.

FIG. 6 is a partial plan view schematically showing a third embodiment of the time switch according to the present invention.

FIG. 7 is a plan view of a conventional time switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Time switch 12 Mainspring 15 Main shaft 23 Inertial pendulum 25 Timer mechanism 26 Operation cam 27, 28 Movable contact plate 29 Fixed contact plate 30, 31 Switch lever 36, 37 Switch 38 Separation cam 39 Separation lever 40 Motor 41 Stop cam 42 Stop contact 42 Single member 112, 113, 114 External connection terminal

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomio Kitazawa 5329 Shimosuwa-cho, Suwa-gun, Nagano F-term in Sankyo Seiki Seisakusho Co., Ltd.

Claims (5)

[Claims] A switch lever for operating a switch member for switching a predetermined operation; an operation cam for operating the switch lever; and an operation cam separate from the operation cam, wherein the switch lever is separated from the operation cam. A separation lever for maintaining the switch member in an off state, a separation cam for operating the separation lever, and a timer mechanism for setting the operation time of the operation cam and the separation cam; and an operation set by the timer mechanism. A time switch for operating the separation lever with the separation cam at the end of the time and separating the switch lever from the operation cam, thereby turning off the switch member and terminating a predetermined operation. . 2. The operation of the operation cam and the separation cam is driven by one drive source.
The time switch described in. 3. The time switch according to claim 2, wherein a mainspring is used as the driving source. 4. The timer mechanism has a speed adjusting means for adjusting a relaxation speed of the mainspring, and a stop means for restraining the speed adjusting means at the end of a set operation time and stopping the timer mechanism. The stop means comprises a stop cam provided coaxially with the separation cam, and a stop contact member for restraining the speed adjusting means by the action of the stop cam,
4. The time switch according to claim 3, wherein the stop contact member is made of a conductive elastic material, and the extended portion is one of the external connection power supply terminals. 5. A switch member for switching the predetermined operation includes a movable contact plate and a fixed contact plate, and is disposed on a side opposite to the stop piece member via a time setting operation spindle. The time switch according to claim 4, further comprising a fixed circuit configured to supply power to the fixed contact plate from the external connection power supply terminal.