JPH0425792Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a time switch that prevents contact arc from scattering.

Prior Art Generally, in a washing machine time switch that has a strength reversal switch, if the high reversal cycle is set to 12 seconds on and 3 seconds off, and the low reversal cycle is set to 1.8 seconds on and 8.2 seconds off, the time will be 15 minutes. With the switch, it is a really strong reversal switch in 15 minutes.
The switch was opened and closed 60 times and the weak reversal switch 90 times, and each time an arc was generated from the contacts of the reversal switch and scattered inside the time switch.

Problems to be Solved by the Invention The arc that frequently occurs from the contacts of the reversing switch scatters into the time switch, causing the oil lubricating the clock mechanism of the time switch to be burned away, and the arc to The resulting carbide mixes with the oil of the gears, solidifies, and accumulates, causing problems in gear meshing and causing problems.

Means for Solving the Problems The present invention aims to solve the above problems, and consists of a main shaft rotatably attached to a timer case, and a main cam attached to the main shaft to control the on/off of the main switch. a clock mechanism section comprising a mainspring or a motor for driving the main shaft, and a gear train; In a time switch comprising a reversing switch section constituted by a moving first reversing cam and a second reversing cam, the first and second reversing cams are connected to a large-diameter cam, a medium-diameter cam, and a small-diameter cam, respectively. Three cams are stacked and integrally formed, and the first and second reversing cams are coaxially arranged with the large diameter cams facing each other with a pinion formed integrally with the reversing cam in between. The clock mechanism and the reversing switch are arranged by forming a wall in the timer case with a window large enough to view one tooth of the gear train of the clock mechanism that meshes with the pinion of the reversing cam. This provides a time switch whose portion is shielded.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

Reference numeral 1 denotes a case, which is made up of an upper case 2 and a lower case 3 joined together, and a main shaft 4 is rotatably supported in the case 1.

5 is a fixed cam fixed to the main shaft 4; 6 and 7 are a main cam and a buzzer cam which are loosely fitted to the tip of the main shaft 4 and are configured to rotate following the convex portion 5a of the fixed cam 5; A main switch 11 and a buzzer switch 12 are controlled to open and close through cam arms 8 and 9 that engage the main cam 6 and the buzzer cam 7. Reference numeral 10 denotes a spring stopper formed on a cam arm 8 that engages with the main cam 6, and is designed to stop a spring stopper 21, which will be described later, when the cam arm 8 falls into the outer peripheral notch of the main cam 6 and the main switch 11 is turned off. There is. Reference numeral 13 denotes a first gear which is attached to the main shaft 4 by a spring seat 14 so as to have a constant sliding torque, and 15 is a mainspring having one end attached to the lower case 3 and the other end attached to the first gear. G is a gear train, and the second pinion 1 meshes with the first gear.
6, and a second gear 17 constituting a ratchet mechanism that meshes with the second pinion 16 only in one direction;
It consists of a third gear 18 and a fourth gear 19 that mesh with the second gear 17, and an escape wheel 20 and a crown 21 that constitute a speed regulating mechanism are linked to the fourth gear 19. It consists of

22 and 23 are first and second reversing cams rotatably mounted on a shaft 24 supported by the case 1, and both reversing cams 22 and 23 are composed of three cams with different diameters (large diameter cam a , a medium diameter cam b, and a small diameter cam c) are integrally formed in a stacked state, and a pinion 25 is integrally formed on the second reversing cam 23 on the large diameter cam 23a side. These first reversing cam 22 and second reversing cam 23 are
A plurality of convex portions 26 protruding from the first reversing cam 22
The pinion 25 is inserted into the insertion hole 27 formed in the pinion 25 of the second reversing cam 23.
The large-diameter cams 22a and 23a are stacked so that they face each other, and rotate together. By meshing the pinion 25 with the second gear 17 of the clock mechanism section T, the first and second reversing cams 22 and 23 are rotationally driven. 28 is the first reversing cam 22
A first reversing switch 29 is driven by the second reversing cam 23, and three lead plates 31 and 32 are insert-molded in the contact piece stator 30 and each driven by the cam. and contact 33,
34. The reversing switch section S is configured as described above.

Reference numeral 35 denotes a partition wall formed inside the case 1 to separate the clock mechanism part T and the reversing switch part S, and as shown in FIGS. 2 and 3, the upper case 2 and the lower case 3 are separated.
It consists of an upper partition wall 35a and a lower partition wall 35b, which are vertically installed from each other, and a part of the upper partition wall 35a is provided with a second gear 17 of the clock mechanism T to mesh with the pinion 25 of the second reversing cam 23. , a window 36 large enough to allow the second gear 17 to be viewed is formed.

With the above configuration, the main shaft 4 is rotated to set a desired time period. As a result, the mainspring 15 is wound, the cam arm 8 is pushed up, the main switch 11 is turned on, and the spring stopper 10 is separated from the spring 21. Although the second gear 16 rotates when the main shaft 4 is set, the rotation is not transmitted to the second gear 17 due to the ratchet mechanism, so that the first and second reversing cams 22 and 23
It doesn't rotate either. When you release your hand from the spindle 4 after setting,
The clock mechanism T starts to be driven by the repulsive force of the wound mainspring 15, and rotates the main shaft 4 in the anti-setting direction. At the same time, the rotation is transmitted to the pinion 25 of the second reversing cam 23 that meshes with the second gear 17, and the first and second reversing cams 22 and 23 also start rotating. and the first and second reversing cams 2
As the switches 2 and 23 rotate, the first and second reversing switches 28 and 29 repeat on and off operations. As a result, each contact 3 of the lead plates 31, 32 of the first and second reversing switches 28, 29
Arcs occur from 3 and 34, but from the 1st and 2nd
Since the reversing switches 28 and 29 are arranged with the large diameter cams 22a and 23a of the reversing switches facing each other, the arc generated on each cam side does not reach the contact on the other cam side. Further, the arc emitted from the reversing switch section S is blocked by the partition wall 35 and is prevented from scattering to the clock mechanism section T. When the desired time period has elapsed, the cam arm 9 falls into the notch of the buzzer cam 7 to notify time-up, and the cam arm 8 falls into the notch of the main cam 6, turning off the main switch 11 and turning off the tenfu stopper 10. locks Tenfu 21 and the time switch stops.

Effects of the Invention As described above, in the present invention, the reversing switch section S and the clock mechanism section T are shielded by the partition wall 35, and the second gear 17 of the clock mechanism section T is passed through the window 36 formed in the partition wall 35 to connect the second reversing cam. Since the first and second reversing cams 22 and 23 are rotated in conjunction with the pinion 25 of 23, arcs are frequently generated from the contacts 33 and 34 of the first and second reversing switches 28 and 29. However, the arc does not scatter into the clock mechanism T, the oil lubricated in the clock mechanism T burns out, and the carbide generated by the arc mixes with the gear oil and solidifies and accumulates. By doing so, it is possible to eliminate the worry of bearings being caused in the meshing of gears. Furthermore, first and second reversing cams 22,
23 is arranged coaxially with the cams 22a and 23a having the largest diameter facing each other, so that the first reversing switch 28 driven by the first reversing cam 22
The arc generated between the contacts 33 of the first reversing cam 22 becomes a wall and does not scatter to the second reversing switch 29 side, and the arc generated between the contacts 33 of the second reversing cam 23 The arc generated between the contacts 34 of the reversing switch 29 of the second reversing cam 2
Since the large-diameter cam 23a of No. 3 acts as a wall, it does not fly toward the first reversing switch 28, and there is no electrical interference between both switches, resulting in the effect of increasing the life of the contacts 33 and 34. have

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional plan view, and FIG.
The line developed cross-sectional view and FIG. 3 are perspective views of essential parts. 1... Timer case, 4... Main shaft, 6... Main cam, 7... Buzzer cam, 8, 9... Cam arm, 10... Tenfu stopper, 11... Main switch, 12... Buzzer switch, 13... First gear, 15... Mainspring, 16... Second pinion, 17... Second gear, 21... Tenfu, 22...
First reversing cam, 23...Second reversing cam, 25
... Pinion, 22a, 23a ... Large diameter cam, 2
2b, 23b...Medium diameter cam, 22c, 23c...
Small diameter cam, 28...first reversal switch, 29...
...Second reversing switch, 31, 32... Lead plate, 33, 34... Contact, 35... Partition wall, 36...
...Window, G...Gear train, T...Clock mechanism, S...
Reversing switch part.

Claims (1)

[Scope of utility model registration request] The main shaft is rotatable in the timer case,
a main cam attached to the main shaft to control on/off of the main switch; a clock mechanism section comprising a main cam, a mainspring or a motor, and a gear train for driving the main shaft; A time switch comprising a reversing switch portion configured of a first reversing cam and a second reversing cam, which are driven by the switch and rotated in conjunction with the gear train, wherein the first and second reversing cams are integrally formed with three cams, a large diameter cam, a medium diameter cam, and a small diameter cam, stacked one on top of the other, and these first and second reversing cams each have a pinion formed integrally with the reversing cam. They are arranged coaxially with the large diameter cams facing each other with a gap in between.
Further, the timer case is provided with a partition wall having a window large enough to allow one tooth of the gear train of the clock mechanism that meshes with the pinion of the reversing cam to be seen, thereby shielding the clock mechanism and the reversing switch. A time switch that is characterized by the following features: