JPH0586012B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a time switch that can be used, for example, in washing machines, electric fans, microwave ovens with a defrosting function, and the like.

(Prior art) For example, as a time switch used in a washing machine, electric fan, microwave oven with a defrosting function, etc., there is a timed operation switch that remains on during a set time and turns off when the set time elapses, and a timed switch that cycles between on and off. There is a device in which a periodic operation switch that alternately repeats the cycle is disposed between a power source and a load so as to be in series with each other, and the load is driven intermittently at every predetermined period. Furthermore, there is also a device in which the load is driven intermittently at predetermined intervals, and the drive of the load is switched between strong and weak states by switching the intermittent on-off time by manual switching operation of a switching operation lever.

(Problem to be solved by the invention) While driving the load intermittently at predetermined intervals,
According to conventional time switches that switch between intermittent on-off times to switch between stronger and weaker loads, the intermittent on-off times are switched manually using a control lever. Therefore, if an attempt is made to switch the intermittent on/off time during timed operation, it must be done manually and cannot be done automatically.

For example, if we consider the rinsing operation of a washing machine, from the beginning of the rinsing operation until a predetermined period of time has elapsed, in order to perform rinsing efficiently, the on-off time is long and the off time is short among intermittent on-off operations. When the "strong" operation is performed, and near the end of the set time, it is desirable to perform the "weak" operation, which is an intermittent on-off operation with a short on time and a long off time, in order to improve the suds removal of the washing water.

However, according to the conventional time switch, if you try to change the intermittent on/off operation time during timed operation, you have to manually change the time, so you tend to forget to change it and it is troublesome to change it. There is a problem.

The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a time switch in which intermittent on/off operation time switching during timed operation is automatically performed. do.

(Means for solving the problem) The invention according to claim 1 includes a timed operation switch;
In a time switch in which a periodic operation switch is arranged between a power supply and a load in a series relationship with each other, the on-off period of the periodic operation switch is switched to a different on-off period during a set time. It is characterized by having a means.

The invention according to claim 2 is characterized in that when 2/3 or more of the set time has elapsed, the periodic operation switch is switched from an on-off cycle to a different on-off cycle.

In the invention as set forth in claim 3, the switching means continues to be on until a certain period of time before the end of the set time has elapsed, and after the certain period of time before the end of the set time has elapsed, it is turned on and off at a cycle different from that of a periodic operation switch. The present invention is characterized in that a switch element is provided between the power supply and the load, and is arranged in series with the timed operation switch and the periodic operation switch.

The invention as set forth in claim 4 is characterized in that the switching means is arranged so as to alternately turn on and off at a cycle different from that of the periodic operation switch, and to be in a series relationship with the timed operation switch and in a parallel relationship with the periodic operation switch. a switch element that selects either a periodic operation switch or a switch element as the energization path to the load, and a switch element that selects either a periodic operation switch or a switch element as the energization path to the load, and a switch that switches the energization path when a certain period of time has elapsed before the end of the set time. The present invention is characterized in that a selection actuation element for actuating the selection element is provided, and the load is energized via a periodic operation switch until a certain period of time elapses before the end of the set time.

The invention as set forth in claim 5 provides a periodic operation switch including two switch elements arranged in parallel with each other and both of which are turned on alternately with an OFF state in between, and the switching means is configured to operate at a predetermined period of time before the end of the set time. After the elapse of time, one of the two switch elements is turned off until a set time elapses.

(Function) In the invention described in claim 1, when a time limit is set, the time-limited operation switch operates for the set time, and the periodic operation switch operates to periodically turn on and off the load. When a certain amount of time has passed before the set time ends,
The switching means switches the on-off period of the periodic operation switch to a period different from the initial on-off period.

In the invention set forth in claim 2, the switching of the on/off period is performed when 2/3 or more of the set time has elapsed.

In the invention according to claim 3, the on/off cycle is determined by the operation of the periodic operation switch until a certain period of time before the end of the set time has elapsed, and after the certain period of time before the end of the set time has elapsed, the on/off cycle is different from that of the periodic operation switch. The on-off period is determined by the operation of the switch element, which alternately turns on and off in a period, and the operation of the periodic operation switch.

In the invention according to claim 4, when a certain period of time elapses before the end of the set time, the selection operation element activates the switch selection element to select the switch element, and the on/off cycle of the load is determined by the operation cycle of this switch element. .

In the invention set forth in claim 5, when a certain period of time elapses before the end of the set time, the switching means selects one of the two switch elements and keeps it in the OFF state until the set time elapses, and then switches the other switch element to the OFF state until the set time has elapsed. The on/off cycle is determined by the element.

(Embodiments) Hereinafter, embodiments of the time switch according to the present invention will be described with reference to the drawings.

In Figures 1 to 5, reference numerals 10 and 11
shows the machine frames that fit together to form the time switch box. A barrel box 110 is formed in the machine frame 11 to accommodate the Zenmai 20 as a driving source. A hole is formed in the barrel 110 for inserting the Zenmai 20. A waterproof wall 103 is formed on one side edge of the machine frame 10.
Terminals for external connection are arranged across 3.

A tube shaft portion 101 is formed in the machine frame 10, and a main shaft 15 is rotatably fitted into the tube shaft portion 101 with play. A protrusion 150 at the upper end of the main shaft 15 is loosely fitted into a shaft support formed on the inner ceiling of the barrel 110 of the machine frame 11. A time setting knob (not shown) is attached to the lower end of the main shaft 15 protruding from the machine frame 10.

A main gear 16 is fitted at the upper end of the main shaft 15 so as to be relatively rotatable, and a friction plate 19 is fitted below the main gear 16. One surface of the friction plate 19 is in contact with the stepped portion of the main shaft 15, and the other surface is in pressure contact with the main gear 16. An engagement recess 160 is formed on the main gear 16, and an engagement protrusion 190 is formed on the friction plate 19. Engagement recess 16
0 has a protruding portion (uncut portion) formed to protrude from the wall surface of the engaging recess 160 toward the center so as to interrupt the rotation locus of the engaging protrusion 190, and is engaged with this protruding portion. By engaging the protrusion 190, the main gear 16 and the friction plate 19 can rotate together. The main gear 16 is provided with a hook portion 161 for latching the starting end of the full length 20.
The starting end of the Zenbu 20 is inserted into the barrel 110 through the hole formed in the barrel 110, and the through hole at the starting end of the Zenbu 20 is hooked to the hook portion 161. When the main shaft 15 is rotated in this state, the entire barrel 20 is rolled into the barrel 110, and the starting end of the entire barrel 20 is latched to a latching portion of the machine frame 10 near the insertion hole.

On the side of the main shaft 15, there is a main shaft 1 between the machine frames 10 and 11.
A shaft 13 is supported parallel to 5. The shaft 13 rotatably supports a large-diameter gear 23, and the boss portion of the large-diameter gear 23 rotatably supports a small-diameter gear 22. The small diameter gear 22 meshes with the main gear 16. The large diameter gear 23 has ratchet teeth 230 on the inside, and a ratchet pawl at the tip of an elastic arm 220 integrally molded with the small diameter gear 22 from resin engages with the ratchet teeth 230. The ratchet teeth 230 and the elastic arm 220 do not transmit the rotational force of the gear 22 to the gear 23 when the main shaft 15 is rotated in the time setting direction, but when the main shaft 15 is rotated in the opposite direction by the biasing force of the full-length 20. It constitutes a one-way clutch 21 that transmits the rotational force of gear 22 to gear 23.

On the side of the shaft 13, there is another shaft 1 between the machine frames 10 and 11.
4 is supported parallel to the axis 13. A gear 24 in which a small diameter gear portion 241 and a large diameter gear portion 242 are integrally molded is rotatably supported on the shaft 14 .
The large diameter gear 23 meshes with the small diameter gear portion 241 of the gear 24. The large diameter gear portion 242 of the gear 24 is
It meshes with the small diameter gear portion 251 of the gear 25 rotatably supported by the shaft 13 below the large diameter gear 23 . The gear 25 has a small diameter gear part 251 and a large diameter gear part 2.
52 pieces are integrally molded. A shaft 65 and a shaft 67 are also supported parallel to the shaft 13 between the machine frames 10 and 11. The shaft 65 rotatably supports the flywheel 26, which has a small-diameter gear portion 261 and a ratchet ring portion 262 having a larger diameter integrally formed therein. The small diameter gear portion 261 of the flywheel 26 meshes with the large diameter gear portion 252 of the gear 25. The rotational force of the main gear 16 is the speed increasing gear train 22-23-241-242-2
51-252-261, and is transmitted to the flying geese wheel 26, causing the flying geese wheel 26 to rotate at high speed. A pendulum 2 is rotatably supported on the shaft 67 and integrally has a pendulum plate 270 on the ratchet ring portion 262 of the gangi wheel 26.
No. 7 ankles 272 are engaged. pendulum 27
is caused to reciprocate by rotating the goose wheel 26 in one direction, and controls the rotational speed of the speed increasing gear train and the main shaft 15 to be constant. A clock mechanism 28 is constituted by the gear 24, the flywheel 26, and the pendulum 27.

Here, the operation of the mechanical parts described above will be explained. When the main shaft 15 is turned in the time setting direction, the friction plate 1
9 engagement protrusion 190 and main gear 16 engagement recess 16
0 engages, the main gear 16 rotates integrally, and the whole movement 2
0 is wound up and stored. In this case, in the one-way clutch mechanism 21, the ratchet pawl at the tip of the elastic arm 220 is connected to the ratchet tooth 230 of the large diameter gear 23.
The rotational force is not transmitted to the clock mechanism 28. On the other hand, when the main shaft 15 is manually returned in the opposite direction to the time setting direction, a slip occurs between the friction plate 19 and the main gear 16, and only the main shaft 15 returns without the main gear 16 rotating.

When the Zenmai 20 is stored as described above, the main gear 16 is driven to rotate in the opposite direction to the time setting direction by the stored power, and the rotational force is transmitted to the main shaft 15 by the frictional force of the friction surface. The main shaft 15 is driven to rotate. In this rotation, the one-way clutch 21
The ratchet pawl is locked to the ratchet tooth 230, and the small diameter gear 22 and the large diameter gear 23 rotate together to transmit rotational force to the clock mechanism 28, and the clock mechanism 28
Therefore, the direction opposite to the time setting direction, that is, Zenmai 20
The rotation in the unwinding direction is adjusted to a constant speed. The friction clutch consisting of the main gear 16 and the friction plate 19 transmits rotational force in both directions up to the rotational force due to the unwinding of the full swing 20, and does not transmit rotational force above a certain level.

A buzzer cam 17 is fitted and fixed to the main shaft 15 below the main gear 16, and a main cam 18 is rotatably fitted below the main gear 16.
As shown in FIG. 14, the buzzer cam 17 and the main cam 18 are superimposed on each other with the central axis of the main shaft 15 as a common rotation center. The buzzer cam 17 has a cam surface consisting of a high step portion 172 that occupies most of the outer circumference and a low step portion 173 that is formed on a part of the outer circumference.
It has a protrusion 175 that protrudes in the axial direction on the lower surface side. The main cam 18 also has a high step portion 18 that occupies most of the outer circumference.
2 and a low step portion 183 formed on a part of the outer periphery, and the tube shaft portion 10 of the machine frame 10.
1, and an engagement recess 181 formed by cutting out a part of the center hole 180.

When the buzzer cam 17 and the main cam 18 are overlapped, the protrusion 175 of the cam 17 fits into the recess 181 of the cam 18, and the cams 17 and 18 are held together.
In this state, circumferential play is provided between the protrusion 175 and the recess 181 so that the cams 17 and 18 can rotate relative to each other within a predetermined range. Therefore, spindle 1
5 rotates, the cam 17 rotates in advance and the cam 18 does not rotate until the protrusion 175 pushes the end of the recess 181. After the protrusion 175 engages with the end of the recess 181, the cams 17 and 18 rotate together. In addition, when the cams 17 and 18 are overlapped as described above, the low step portions 17 of the cams 17 and 18
3,183 are almost overlapping each other. In addition, cam 1
The low step portion 173 of the cam 18 is formed over a somewhat wider range than the low step portion 183 of the cam 18 .

In FIG. 14, a switch consisting of a plurality of contact plates 31, 32, 33, 34, and 35 is arranged to face the cams 17 and 18. One end of each contact plate is fixed to an insulating base 69 by molding, and the insulating base 69 is fixed to the machine frame 10.

The contact plate 31 is driven by the cam 18 via a driven member 41 integrally formed with the contact plate 31, and constitutes a first switch 90 that comes into contact with and separates from the contact plate 32.
The first switch 90 is turned on when the driven portion 411 at the tip of the driven member 41 faces the high step portion 182 of the cam 18, and turned off when it falls into the low step portion 183.

The contact plate 33 is connected to the cam 17 via the driven lever 42.
This constitutes a second switch 91 that is driven by the switch 91 and moves into and out of contact with the contact plate 32. The driven lever 42 is mounted on an insulating base 69
It is rotatable around an axis 691 formed in
A driven portion 421 with the cam 17 and an abutment portion 422 with the contact plate 32 are provided on both sides of the tip. Second switch 9
1 is off when the driven part 421 of the lever 42 faces the high stage part 172 of the cam 17;
It turns on when you feel depressed.

The contact plate 34 is driven by the cam 18 via the slide lever 43 which is driven by the movement of the driven member 41.
A third switch 92 that comes into contact with and separates from the contact plate 35 is configured. The lever 43 slides along the guide groove 105 formed in the machine frame 10, and the contact plate 34 is pushed toward the contact plate 35 by the protrusion 431 formed on the lever 43. The lever 43 follows the movement of the driven member 41 by loosely fitting the pin portion 412 of the driven member 41 into the hole 432 of the lever 43 .

The first switch 90 constitutes a main switch 90, and is connected in series between the power supply 77 and the load as shown in FIG.

The second switch 91 constitutes a buzzer switch and is connected in series between a power source and a buzzer (not shown). Main switch 90 and buzzer switch 91
When the main shaft 15 rotates in the time setting direction (counterclockwise direction indicated by the dashed arrow in FIG. 14), the cam 17 moves in advance due to the play between the projection 175 and the engagement recess 181. The contact plate 33 is separated from the contact plate 32, and the buzzer does not sound. On the other hand, when the main shaft 15 rotates in the clockwise direction shown by the solid arrow in FIG. 14 with the accumulated force of the full movement 20, the cam 17 returns first within the range of play mentioned above, and the main switch 90 is turned off. The contact plate 33 contacts the contact plate 32 for a predetermined time, and the buzzer sounds for a short time to notify the end of the set time. Each contact plate 31, 3
One end portions of 2, 33, 34, and 35 protrude outward from the insulating base 69 and serve as external connection terminals.

A base end portion of the contact plate 31 is connected to a switch element side to be described later. A pendulum stop piece 44 is fixed to the tip of the contact plate 32 by resin molding.
When the contact plate 32 is in a free state, the contact plate 32
However, the contact plate 31 is separated and the pendulum 2 is moved as shown in FIG.
The pendulum stop piece 44 comes into contact with a stop pin 271 formed protruding from the lower end of the pendulum 27, stopping the swinging of the pendulum 27 and stopping the drive system of the time switch. When the driven portion 411 of the driven lever 41 faces the high step portion 182 of the cam 18, the contact plate 31 is opposed to the contact plate 32.
while urging the contact plate 3 outward in the radial direction of the cam 18.
2, the contact plate 32 bends in the same direction,
When the driven part 411 falls into the low step part 182 of the cam 18 and the contact plate 31 separates from the contact plate 32, the contact plate 32 returns to its original position due to its own elasticity, and the pendulum stop piece 44 moves as described above. It abuts against the stop pin 271.

2, 5 to 8, a reversing cam 50 whose boss portion engages with the boss portion of the gear 24 and rotates integrally with the gear 24 is attached to the shaft 14.
is supported on the underside of the The reversing cam 50 has four layers of cam surfaces 51 each having a different uneven shape on the outer periphery.
It is a multilayer cam having 52, 53, 54 and a cam 133 thereon in the axial direction, and is made by integral molding of resin. The cam surfaces 51 and 53 form a pair to form a first cam surface, and the cam surfaces 52 and 54 form a pair to form a second cam surface.

As shown in FIG. 6, the cam surface 51 consists of a high step portion 511 that occupies most of it and a low step portion 512 that remains. On the other hand, as shown in FIGS. 6 and 7, the cam surface 52 consists of a high step portion 521 formed over approximately half the circumference and a low step portion 522 formed over the remaining approximately half circumference. Each of the cams 51 and 52 is formed with a depressed portion 501 extending from a high step portion to a low step portion at the same position. Similar to the cam surface 51, the cam surface 53 also has a high step portion 531 that occupies the majority and a low step portion 53 that remains.
2, and is formed line-symmetrically with respect to the cam surface 51. Similar to the cam surface 52, the cam surface 54 also has a high step portion 541 and a low step portion 542 extending approximately half the circumference.
It is formed line-symmetrically with the cam surface 52. Each of the cam surfaces 53 and 54 is formed with a depressed portion 503 extending from a high step portion to a low step portion at the same position.

1, 4, and 6, the bases of a plurality of elastic contact plates 36, 37, and 38 are fixed to the machine frame 10 via an insulating base 550.
The contact plate 38 constitutes a fixed contact plate, and also
The tip of the contact plate 38 is bent at a right angle in a direction that crosses the other contact plates 36 and 37 in the width direction.
A contact 39 is fixed at a position facing 6 and 37. The contact plates 36 and 37 constitute movable contact plates, and contacts 361 and 371, which can come into contact with the contact 39, are fixed to the tips of the movable contact plates.

A driven portion 611 at the tip of the driven lever 61 comes into sliding contact with an arbitrarily selected cam surface of the cam surfaces 51 and 52 of the reversing cam 50 . Further, a driven portion 621 of the driven lever 62 is provided on the cam surface 53 or the cam surface 54.
are in sliding contact. Followed portion 6 of each driven lever 61, 62
The cam surface of the reversing cam 50 on which the cams 11 and 621 slide is selected by a cam surface switching means, which will be described later. When the portion 611 faces the cam surface 52, the driven portion 621 always faces the cam surface 54. A shaft hole is formed in the base 613, 623 of each driven lever 61, 62,
By loosely fitting this shaft hole into the lever shaft 63, each driven lever 61, 62 is driven by the rotation of the reversing cam 50 and individually swings about the shaft 63. A contact plate operating portion 612 is formed protruding from the driven lever 61 on the opposite side of the driven portion 611, and a contact plate operating portion 622 is also formed protruding from the driven lever 62. When the driven levers 61 and 62 swing following the reversing cam 50, the respective contact plate operation parts 612 and 622 swing the respective movable contact plates 36 and 37. Followed lever 61
When the driven part 611 faces the low step part 512 or 522 of the reversing cam 50, the contacts 361 and 39 of the contact plates 36, 38 come into contact, turning on the forward rotation switch 55, and the driven part 611 faces the high step part 511 or 521. When this happens, the normal rotation switch 55 is turned off. Further, when the driven portion 622 of the driven lever 62 faces the low stage portion 532 or 542 of the reversing cam 50, the reverse rotation switch 56 is turned on, and when the driven portion 622 of the driven lever 62 faces the high stage portion 531 or 541, the reverse rotation switch 56 is turned off. .
As shown in FIGS. 10 and 11, each lever 6
1 and 62 are formed with curved portions 616 and 626, and engagement protrusions 614 and 624 are respectively formed to protrude inside these curved portions 616 and 626, that is, on the cam 50 side.

In Figures 4, 6, 9, and 12,
The bases of the levers 61 and 62 are rotatably supported within the holding cover 64 by a shaft 63 passing through an upper end plate 641 and a lower end plate 642 of the cover 64.
A portion of the outer peripheral surface of the cover 64 is cut out to form a lever window 645.
The bases of the levers 61 and 62 are inserted and mounted. The lever window 645 is formed in a range that does not hinder the swinging of the levers 61 and 62. The shaft 63 passes through an arc-shaped elongated hole 75 of a cam 73 having a fan-shaped planar shape on the lower side of the lower end plate 642 of the holding cover 64 . The cam 73 has a cylindrical shaft portion 71 integrally formed in a portion corresponding to the key point of the fan, and the lower end portion of the shaft portion 71 is loosely fitted into a shaft support 105 that is formed integrally with the machine frame 10 to protrude. The upper end of the cam 71 passes through a hole in the machine frame 11, so that the cam 73 can rotate around the shaft support 105. A base portion of a manual operating lever 74 is fitted and fixed to the upper end portion of the shaft portion 71 protruding from the machine frame 11. The shaft portion 71 is the lever 6
It is located inside the curved portions 616 and 626 of No. 1 and 62. An engaging projection 712 is formed on the outer periphery of the shaft portion 71 so as to extend along the axial direction and protrude in the radial direction. When the shaft portion 71 is rotated by operating the operating lever 74, the jetty 712 comes into contact with the engaging protrusions 614, 624 of the levers 61, 62, and the jetty 712 further pushes the engaging protrusions 614, 624, so that the lever 6
1 and 62 to separate them from the cam surface of the reversing cam 50. At this time, the levers 61 and 62 are such that the driven parts 611 and 621 are connected to each high step part 511 of the cam 50,
The lever is moved to the same position as when facing 521, 531, and 541, or to the outside. When the shaft portion 71 further rotates, the engagement protrusion 61
4, 624 and the engagement jetty 712 are separated and do not interfere with each other, and the levers 61, 62 return to rotation due to the elasticity of the contact plates 36, 37, and the driven portion 61
1,621 comes into contact with the cam surface of the reversing cam 50.

The elongated hole 75 is formed at the tip edge of the cam 73 along an arc centered on the shaft support 105, and the rotation range of the cam 73 is regulated by the shaft 63 passing through the elongated hole 75. Note that a protrusion that restricts the rotation range of the cam 73 is also formed on the machine frame 10 side. A cam surface 72 having an axial lift is formed around the long hole 75. The cam surface 72 is
It has a high stage part 721 and a low stage part 722 at both ends, and has an inclined surface 723 connecting these two parts in the middle part.

The lower end plate 642 of the holding cover 64 has a cam surface 7
Slides into contact with 2. A coil spring 65 is interposed between the upper end plate 641 of the holding cover 64 and the machine frame 11, and the lower end plate 642 of the holding cover 64 is pressed against the cam surface 72 by the elasticity of the spring 65.
When the operating lever 74 is rotated, the cam 73 rotates integrally, and the cam surface 72 on which the lower end plate 642 of the cover 64 slides passes through the inclined surface 723 and reaches the high step 721.
Or the coil spring 6 is switched to the low step portion 722.
5, the cover 64 and this cover 64
Levers 61 and 62 inside move up and down along a shaft 63.

In this way, the lower end plate 642 of the cover 64 is attached to the cam 7.
When the lever 6 is in contact with the high step 721 of 3.
1 and 62 are located above against the spring 65, and the driven parts 611 and 621 of the levers 61 and 62 are connected to the reversing cam 5.
0, respectively. Further, the lower end plate 642 of the cover 64 is connected to the cam 73.
When the lever 6 is in contact with the lower part 722 of
1 and 62 are in the lower position due to the biasing force of the spring 65,
The driven portions 611 and 621 of the levers 61 and 62 face the second cam surfaces 52 and 54 of the reversing cam 50, respectively.

In addition, during the rotation operation of the operation lever 74, the engagement jetty 712 of the shaft portion 71 and the lever 6
The levers 61, 62 are rotated by contact with the engaging protrusions 614, 624 of No. 1, 62, and the driven portions 611, 621 are released outward in the radial direction of the cam 50, causing the cam 50 to move in the axial direction. When moving, each cam surface 5
1, 52, 53, 54, lever 61,
This prevents the driven part of 62 from getting caught.

An engaging jetty 646 is formed on the outer periphery of the cover 64 in the axial direction. The engaging jetty 646 is the machine frame 10
It fits into the guide groove 108 formed in the
The cover 64 is supported movably along the guide groove 108 but unrotatably around the shaft 63.

The components including the operation lever 74, cam 73, holding cover 64, etc. can be operated by moving the reversing cam 50 and the reversing switches 55, 56 or the driven levers 61, 62 relative to each other.
A cam surface switching means 70 is configured to switch between a state in which the first cam surfaces 51 and 53 perform on-off control and a state in which the second cam surfaces 52 and 54 perform on-off control.

However, in order to switch the cam surface of the reversing cam 50 that the reversing switches 55, 56 or the driven levers 61, 62 come into sliding contact with, the reversing switches 55, 56 or the driven levers 62 do not need to use the cam 73.
1 and 62 may be moved, or the reversing cam 50 may be moved. Furthermore, the holding cover 64 may be omitted.

As shown in FIGS. 2, 5, 16, and 17, another cam 121 is fitted onto the support shaft 15 above the buzzer cam 17. As shown in FIGS. The cam 121 has a notch 128 formed at a constant opening angle on the inner circumferential side,
A pin 129 passing through the main shaft 15 in the radial direction is fitted into the notch 128 with a space allowance, and the cam 121 and the main shaft 15 can rotate relative to each other within this space allowance. The cam 121 has a notched low step portion 122 on its outer peripheral surface. Cam 121
A contact plate 124 is arranged facing the outer circumferential surface of the contact plate 124 . The contact plate 124 is coupled to a conductive plate 125 coupled to the base of the contact plate 31. Contact plate 1
A follower 123 is interposed between 24 and the cam 121. The follower 123 is slidably provided by appropriate guide means, and one end of the follower 123 is in sliding contact with the circumferential surface of the cam 121 due to the elasticity of the contact plate 126.

A contact plate 126 is coupled to the base of the contact plate 38 in a direction perpendicular to the contact plate 38 . The contact plate 126 is spaced apart from the contact plate 124 by a predetermined distance,
However, due to the elasticity of the contact plate 126, the contact plate 124
is set up so that it can be contacted.

the cam 1 rotatably provided on the shaft 14;
33 has four low step portions 134 at equal intervals on the outer peripheral surface, as shown in FIG. A follower 135 is interposed between the outer periphery of the cam 133 and the contact plate 135. The follower 135 is slidably held by appropriate guide means. A pin 136 is fixed to the follower 135. The pin 136 is in pressure contact with the contact plate 126, and one end of the follower 135 is in sliding contact with the outer periphery of the cam 133 due to the elasticity of the contact plate 126. Contact plate 124 and contact plate 126 constitute a switch element 130. The state shown in FIG. 16 is before time setting, in other words, the timed operation has ended and the load has been turned off, and the follower 12
3 is sunk into the low step portion 122 of the cam 121. Further, the follower 135 is connected to the lower part 1 of the cam 133.
34 and switch element 130 is turned on. When the main shaft 15 is rotated from this state to set the time, the cam 121 is also rotated counterclockwise in FIG. 16, as shown in FIG. 20a.
The follower 123 is pushed by the high step part of the cam 121, and the contact plate 124 is pushed toward the contact plate 126 side. In this state, the switch element 130 remains in the on state regardless of whether the follower 135 is in sliding contact with the low step portion 134 or the high step portion of the cam 133. When a predetermined time, for example, 2/3 or more of the set time has elapsed within the set time, the low step portion 122 of the cam 121 returns to the position of the driven portion 123, as shown in FIG. Falling into 122 and contact plate 1
24 moves in a direction away from the contact plate 126.
After that, the switch element 130 is turned on when the follower 135 comes into sliding contact with the low step part 134 of the cam 133 as shown in FIG. When the switch element 130 comes into sliding contact with the switch element 130, the switch element 130 is turned off and alternately turns on and off. This repeated on/off operation is
This is continued until the set time elapses and the cam 121 returns to its original position.

FIG. 18 shows a connection example of each of the switches described above. In FIG. 18, contact plates 124, 126
A timed operation switch 90 consisting of a switch element 130 and contact plates 31 and 32 is connected in series between a power source 77 and a load, and also connected in parallel to each other, and is selected by operating a control lever 74. Switches 55 and 56 are connected in series with switch element 130 and switch 90. As is clear from FIG. 18, switch 90 and switch 130 substantially constitute a main switch. Here, the switch 90 is assumed to be a first main switch, and the switch element 130 is assumed to be a second main switch.

Next, the overall operation will be explained by taking as an example the case where the time switch according to the above embodiment is used as a time switch for a water flow generation motor of a washing machine. Here, it is assumed that the switch 55 is connected to the forward rotation circuit of the motor, and the switch 56 is connected to the reverse rotation circuit of the motor.

Now, when the main shaft 15 is rotated by operating the knob to set the time limit, the speed-increasing gear train is rotationally driven by the biasing force of the Zenmai 20, and the main shaft 15 is set at a constant speed by the operation of the clock mechanism 28. It is rotated in the opposite direction to the rotation direction at the time. The rotation of the main shaft 15 also causes the cam 121 to rotate as shown in FIG. 20a, turning on the switch element 130 as described above. As the main shaft 15 reverses, the cam 121 returns to its original position and reverses. Gear 2 in the above speed increasing gear train
4 and the reversing cam 50 have their bosses engaged with each other, and the reversing cam 50 is rotated integrally with the gear 24 at a relatively high speed. When the reversing cam 50 rotates, the surface of the cam 50 that the driven parts 611, 621 of the levers 61, 62 face alternately switches between a high stage part and a low stage part, and when the driven parts 611, 621 face the high stage part. The switches 55 and 56 are off, and the driven part 61 is off.
When 1,621 faces the lower part, switch 5
5 and 56 are turned on.

Here, it is assumed that the weak water flow is selected by the operation lever 74 and the driven parts 611 and 621 of the levers 61 and 62 are facing the first cam surfaces 51 and 53 of the reversing cam 50. Since the first cam surfaces 51 and 53 are constructed as described above, the switches 55 and 53 are alternately turned on and off with a phase difference of 180°. FIG. 19b shows this operation, in which relatively short 4 second forward and reverse rotation operations are performed alternately after a relatively long 11.5 second off time. In this way, the operating time of the water flow generating motor within the set time is short and the stopping time is long, so that a weak water flow can be obtained.

Next, when the operation lever 74 is rotated as shown in FIG. 6 to select strong water flow, the lower end plate 642 of the holding cover 64 comes into contact with the low step part 722 of the cam 72 as shown in FIG. , 62 move downward. As shown in FIG. 12, the levers 61 and 62 have driven portions 611 and 621 facing the second cam surfaces 52 and 54 of the reversing cam 50, respectively. In this case as well, the switches 55 and 56 are turned on and off at regular intervals due to the rotation of the reversing cam 50, but the second cam surfaces 52 and 5
4 is the high step portion 521, 5 which is longer than half the circumference as mentioned above.
41 and the low step portions 522 and 542 that are shorter than half the circumference, the water flow generation motor rotates normally for a relatively long time of 13.5 seconds with a relatively short off time of 2 seconds, as shown in FIG. 19a. and reverse operation are performed alternately. In this way, the operating time of the water flow generating motor within the set time is long and the stopping time is short, so a strong water flow can be obtained.

Here, for example, if the set time is 15 minutes, when about 2/3 of the set time, that is, 10 minutes or more has passed, the cam 121 returns to near its original position, and the follower 123 is the lower part 12 of the cam 121
2, and the contact plate 124 moves in a direction away from the contact plate 126. However, the contact plate 124,
The on/off state of the switch element 130 consisting of 126 depends on the rotation of the cam 133. The cam 133 rotates at a relatively high speed, and when the follower 135 is in sliding contact with the high step of the cam 133 as shown in FIG.
The switch element 130 is turned on when it is in sliding contact with the low step part 134 of the cam 133 as shown in Figure 0c. Since the cam 133 rotates together with the reversing cam 50, the switch element 130 is connected to the switches 55 and 56.
Turns on and off in sync with. Also, switch element 1
30 is relatively long, as shown in Figure 19c.
The high step portion and the low step portion of the cam 133 are formed so that the cam 133 has an OFF operation of 11.5 seconds and a relatively short ON operation of 4 seconds.

Therefore, when the strong water flow is currently selected and a certain period of time before the end of the set time, for example one minute before the end of the set time, the water flow generation motor is turned on and off depending on the on and off of the switch element 130. When the switch element 130 is off, the motor is also off; when the switch element 130 is on, the motor rotates normally if the switch 55 is on; and when the switch element 130 is on, the motor rotates normally.
If 6 is on, the motor will reverse. The on/off pattern of this motor is the same as the pattern for weak water flow, as shown in Figure 19 b and c, and therefore, after a certain period of time before the end of the set time, it will automatically switch to weak water flow. It turns out.

Even after a certain period of time has elapsed before the end of the set time in the state where weak water flow is selected, the switch element 130
operates as described above, but switch element 130
Since the on/off operation timing is the same as the on/off operation timing when the weak water flow is selected, the on/off time of the motor does not change midway. In short, regardless of whether the strong water flow is selected or the weak water flow is selected, the water flow becomes weak water flow once a certain period of time has elapsed before the end of the set time.

When the set time has elapsed, the main cam 18 returns to its original position and the switch 90 is turned off.
All power supply to the motor stops and operation ends.

As described above, according to the above embodiment, the intermittent on/off time is automatically switched when a certain period of time is reached before the end of the set time during timed operation, so if this is used as a time switch for a washing machine, for example, it will be After a predetermined period of time has elapsed during operation with a water stream, it can automatically switch to a weak water stream, allowing efficient washing and rinsing with a strong stream of water, followed by easy removal of suds with a gentle stream of water, but with manual operation. This can be achieved automatically without any need.

As in the illustrated embodiment, the cam 121 and the main shaft 15
By providing a margin in the direction of rotation between
The switch element 130 can be operated in a controlled manner. That is, when the cam 121 returns close to its original position after a certain period of time has elapsed before the end of the set time,
The follower 123 presses the slope of the lower step 122 of the cam 121 to instantaneously rotate the cam 121 in advance of the main shaft 15, thereby quickly operating the switch element 130. The structure for attaching the cam 121 to the main shaft 15 may be any suitable structure other than the structure described above.

For example, if the above-mentioned time switch is used as a so-called sleep timer for an electric fan, it can generate wind at a standard strength until a certain period of time elapses before the end of the set time, and then generate weak wind after that. , you can comfortably fall asleep with the fan running, and your health will not be harmed. Also, if used as a defrost timer for a microwave oven, after defrosting has progressed to a certain extent within the set time,
It has the advantage of being able to thaw slowly while waiting for the heat to be evenly transferred to the entire object.

Next, another embodiment of the present invention will be described.

In the embodiments shown in FIGS. 21 to 23, the automatic switching of the on/off cycle is performed purely mechanically when a certain time period is reached before the end of the set time period. In FIGS. 21 and 22, the main shaft 15
The cam 1 has a cam 152 on the outside of the machine frame 11.
52 has a notched low step portion 154 on the outer periphery and a fan-shaped notch 153 on the inner periphery. A pin 151 passing through the main shaft 15 is fitted into the notch 153 with space in the rotational direction of the main shaft 15. The operating lever 74 explained in the above embodiment has its shaft 71.
It has a protruding piece 163 on the opposite side with the protruding piece 163
A pin 164 is fixedly planted in the. A bell crank-shaped lever 157 is rotatably supported on the machine frame 11 by a shaft 156. One arm of the lever 157 passes between the cam 152 and the pin 164,
A tension spring 158 is applied to the tip end of the lever 157 to urge the lever 157 to rotate counterclockwise in FIG. The lever 157 is applied to the second
1 by rotating the pin 164 as shown by the chain line in FIG.
Rotate clockwise as shown at A to shorten the on/off time of the load. however,
The lever 157 can be rotated counterclockwise by force only when the tip of the other arm 159 is depressed into the low step portion 154 of the cam 152. The tip of the arm 159 of the lever 157 slides into contact with the high step part of the cam 152, and the lever 157 moves to the 21st position.
When rotating clockwise as shown by the solid line in the figure, the operating lever 74 can be freely rotated by manual selection operation.

In this embodiment, the switch element 130, the cam 121, the follower 123, and the follower 135 in the previous embodiment are unnecessary, and the contact plate 31 and the contact plate 38 are not required.
It suffices if they are electrically coupled.

Now, suppose that the main shaft 15 is rotated to set a time limit, and the operating lever 74 is set to the position shown by the solid line in FIG. 21. As the main shaft 15 rotates, the cam 152 also rotates, and the tip of the arm 159 of the lever 157 comes into sliding contact with the high step of the cam 152, and the lever 157 rotates clockwise against the biasing force. By setting the operating lever 74 as described above, the switches 55 and 56 are turned on and off by the second cam surfaces 52 and 54 of the reversing switch 50, as described in the above embodiment, so that they are turned on and off within a certain period. The off time width becomes longer and the off time width becomes shorter. FIG. 23a shows the operation of energizing the load at this time, in which the load is energized alternately in the forward and reverse directions for a long time of 13.5 seconds with a short off time of 2 seconds in between.

When a certain time is reached before the end of the set time, the cam 152
returns to near its original position, and the tip of the arm 159 of the lever 157 falls into the lower step 154 due to the rotational biasing force. This causes the lever 157 to rotate counterclockwise in FIG. 21, pushing the pin 164 of the operating lever 74 and rotating the operating lever 74 clockwise. As a result, the switches 55 and 56 described in the previous embodiment are the first switch of the reversing switch 50.
Since it is turned on and off by the cam surfaces 51 and 53, the on time width within a certain period is short and the off time width is long. The right-hand portion of FIG. 23a shows this operation, in which the load is alternately energized in the forward and reverse directions for short periods with long off-times in between.

When the operating lever 74 is manually set to the position shown by the solid chain line 74A in FIG. Since the first cam surfaces 51 and 53 of 50 are turned on and off, the current is alternately energized in the forward and reverse directions for a short period of time with a long off period in between from the time the time limit is set until the set time has elapsed, as shown in FIG. 23b. be done.

In this way, the above embodiment also provides the same effects as the above embodiment.

In addition, in claim 4, the "switch element" refers to the switches 55, 56,
The "switch selection element" refers to the operating lever 74 in the above embodiment, and the "switch selection element" refers to the component consisting of the cam 152, lever 157, and spring 158.

Next, another embodiment shown in FIGS. 24 and 25 will be described. In FIG. 24, the main shaft 15 is provided with a cam 185 that is rotatable together with the main shaft 15. The cam 185 has a notch-shaped low step portion 186 on its outer circumference. A bell crank-shaped lever 188 is supported beside the cam 185 so as to be rotatable about a shaft 187. One end 19 of lever 188
5 faces the cam surface of the cam 185, and the lever 188
The other end 196 faces the base of one lever 61 that cooperates with the reversing cam 50. Lever 1
88 has a protrusion 197 on one end 195 side, and the protrusion 1
97 contacts the leaf spring 198, the lever 188 is biased to rotate counterclockwise. In this embodiment, the contact plate 31 and the contact plate 38 are electrically coupled. The other configurations are the same as those of the previous embodiment. Also in the case of this embodiment, the switch element 130, the cam 121, the follower 123, and the follower 13 in the first embodiment are also used.
5 is unnecessary.

Suppose now that the main shaft 15 is rotated to set a time limit. The cam 185 rotates together with the main shaft 15, one end 195 of the lever 188 comes into sliding contact with the high step of the cam 185, and the lever 188 is rotated clockwise against the biasing force. Therefore, the other end 19 of the lever 188
6 escapes from the rotation range of the lever 61, and the lever 61
operate effectively. At this time, if the operating lever 74 in the above-mentioned embodiment has selected "strong", as shown in FIG. If the lever 74 has selected "weak", as shown in FIG. 25b, electricity is alternately energized in the forward and reverse directions for a short time with a long off time in between.

When a certain period of time has elapsed before the end of the set time, the cam 185 returns to near its original position, one end 195 of the lever 188 faces the low step 186 of the cam 185, and the lever 188 rotates counterclockwise under the force. . By rotating this lever 188, the other end 1
96 forces the lever 61 to rotate counterclockwise and away from the reversing cam 50. In this way, the lever 61 is forcibly restrained in an inoperative state, and only the switch 55 is turned on and off, and the switch 56 remains off. Therefore, after a certain period of time has elapsed before the end of the set time, for example, normal rotation - pause -
The operation is as follows: Pause - Pause - Normal rotation - Pause - Pause - Pause... and the on/off time is switched. The right half of FIGS. 25a and 25b shows this operation. In this case, after a certain period of time has elapsed before the end of the set time, only the reverse direction is driven intermittently.

In this way, also in the case of the above-mentioned embodiment, the on-off time can be automatically switched after a certain period of time has elapsed before the end of the set time, and the same effects as in the above-mentioned embodiment can be achieved.

In addition, in the above embodiment, the lever 62 of the levers 61 and 62 may be restrained inoperable.

In claim 5, the "two switch elements" refer to the switches 55 and 56 in the above embodiment, and the "switching means" refers to the cam 185 and the lever 188.
Refers to the component parts consisting of.

(Effects of the Invention) According to the present invention, it is possible to automatically switch the intermittent on/off time when a certain period of time before the end of the set time during timed operation is reached, thereby eliminating the hassle and switching of the on/off time by manual operation. Problems such as forgetting can be solved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the time switch according to the present invention, Fig. 2 is a sectional view showing a part of the speed increasing gear train of the same embodiment, and Fig. 3 is the above speed increasing gear train including the clock mechanism. 4 is a partially sectional left side view of the above embodiment, FIG. 5 is an exploded perspective view of the above embodiment, and FIG. 6 is a reversing switch mechanism of the above embodiment. FIG. 7 is a plan sectional view of the reversing cam of the above embodiment, FIG. 8 is a front view showing the relationship between the reversing cam and the reversing switch, and FIG. 9 is a cam surface switching means of the above embodiment. FIG. 10 is a plan view showing different operating modes of the reversing switch mechanism according to FIG. 6, FIG. 11 is a plan view showing one of the levers for the reversing switch mechanism, and FIG. 12 is a plan view of the reversing cam. and a front view showing different operating modes of the reversing switch according to FIG. 8, FIG. 13 is a front view showing different operating modes of the cam surface switching means according to FIG. 9,
FIG. 14 is a plan view of the time limit switch mechanism portion of the above embodiment, FIG. 15 is a plan view showing different operating modes of the same switch mechanism portion, and FIG. 16 is a plan view of the switching means portion of the above embodiment. Fig. 17 is a partially sectional front view of the same as above, Fig. 18 is a circuit diagram showing an example of an electric circuit applicable to the above embodiment, Fig. 19 is a timing chart showing the operation of the above embodiment, and Fig. 20 is the above switching means. 21 is a plan view showing another embodiment of the time switch according to the present invention; FIG. 22 is a side view of the same; FIG. 23 is a timing chart showing the operation of the above embodiment; Second
FIG. 4 is a plan view showing still another embodiment of the time switch according to the present invention, and FIG. 25 is a timing chart showing the operation of the same embodiment. 55, 56... Periodic operation switch, 74... Switch selection element, 90... Timed operation switch, 1
30...Switch element, 152, 157, 158
...Switch selection element, 185, 188...Switching means.

Claims (1)

[Claims] 1. A timed operation switch that remains on during a set time and turns off when the set time elapses, and a periodic operation switch that periodically repeats on and off during the set time are connected in series with each other. A time switch disposed between a power supply and a load so as to be related to each other is characterized by being provided with a switching means for switching the on-off cycle of the periodic operation switch to a different on-off cycle during a set time. A time switch. 2. The time switch according to claim 1, wherein the switching means switches the on/off cycle of the periodic operation switch to a different on/off cycle when two-thirds or more of the set time has elapsed. 3 The switching means continues to be in the on state until a certain time before the end of the set time has elapsed, and after the certain time before the end of the set time has elapsed, it alternately turns on and off at a period different from that of the periodic operation switch, and the switching means does not turn off the power supply. It has a switch element arranged in series relationship with the timed operation switch and the above-mentioned periodic operation switch between the load, and after a certain period of time has elapsed before the end of the set time, both the above-mentioned switch element and the above-mentioned periodic operation switch are switched off. 3. A time switch according to claim 1, wherein the load is energized only when the switch is in the on state. 4. The switching means includes a switch element that alternately repeats on and off at a period different from that of the periodic operation switch, and is arranged in series with the timed operation switch and in parallel with the periodic operation switch; A switch selection element for selecting either the periodic operation switch or the switch element as the energization path to the load, and a selection for activating the switch selection element to switch the energization path after a certain period of time before the end of the set time. 3. The time switch according to claim 1, further comprising an actuating element, wherein power is supplied to the load via the periodic operation switch until a predetermined time period elapses before the end of the set time period. 5. A periodic operation switch consists of two switch elements that are arranged in parallel with each other and are turned on alternately with both off states in between. 3. The time switch according to claim 1, wherein one of the switches is kept off until a set time has elapsed.