JPS6128372Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses a cam that rotates in short cycles,
This invention relates to a timer having two types of cams, one of which rotates in a long cycle.

Conventionally, this type of timer has a short-time cycle cam and a long-time cycle cam installed side by side in a case, and each of them is connected to a drive member (for example, a timer motor or a mainspring) through a gear train having a different gear ratio. It is structured in a linked manner. However, in this structure, both the flat cam and the gears are arranged in the direction of the surface thereof, so a large space is required, resulting in a problem that the timer becomes large. In order to solve the above problem, a low-speed cam and a high-feed cam are arranged overlappingly on the axis of the main shaft, and a timer motor is connected to the low-speed cam via a gear train for deceleration. On the other hand, the high-speed cam has a gear attached to the low-speed cam side of the cam, and the gear is attached to the side of the low-speed cam in a cantilever shape different from the reduction gear. There is a timer that is connected to a gear attached to the low-speed cam via a speed-increasing gear so that the low-speed cam rotates at a low speed while the high-speed cam rotates at a high speed. -Refer to Publication No. 41754). However, the above-mentioned timer requires an accelerating gear in addition to the decelerating gear, which increases the number of parts, resulting in a problem that the timer becomes more expensive and larger.
Further, since the speed increasing gear is cantilevered, there is a problem that it may wobble during rotation and may come out of mesh with the gear attached to the high speed cam.

Therefore, the present invention was developed to solve the above problems, and even if two cams are arranged on the same axis, they can be rotated at different speeds, and the number of parts is reduced. The smaller amount is sufficient to make the timer smaller and cheaper, and moreover, it can operate stably. This is an attempt to provide a timer with a structure that allows this.

The drawings showing the embodiments of the present application will be described below. Cases 1 and 2 are attached facing each other. These cases 1 and 2 are each made of a synthetic resin material. 3 is a connecting member, and 4 is a support shaft erected from the case 2. Next, 5 is a main shaft, which is rotatably supported by the case 1 and the support shaft 4. Reference numeral 6 denotes a first cam rotatably mounted on the support shaft 4, and its circumferential surface is formed with concave portions and convex portions as is well known. Reference numeral 7 indicates a first driven gear formed integrally with the first cam 6, and reference numeral 8 indicates a transmission gear formed integrally with the first cam 6. Next, 9 is the main shaft 5
a cam boss fixed to; 10 indicates a second cam;
It consists of cam elements 10a and 10b, each of which is rotatably mounted on a cam boss 9. 11 is a second driven gear rotatably mounted on the cam boss 9; 12 and 13 are clamping members fixed to the cam boss 9 and the main shaft 5, respectively, which clamp the driven gear 11; The main shaft 5 and the driven gear 11 are configured to rotate together due to the frictional force with the driven gear 11. Next, the reference numeral 14 indicates a first switch that is movably opposed to the first cam 6, and the reference numeral 15 indicates a second switch that is driven by the second cam 8. As shown in FIG. 2, a holder is attached to the case. 16, contact plates 17, 17, 17 held by the holder 16,
Attached to the contact plates 17, 17 and the cam element 10a,
10b Followed pieces 18, 18 which were brought into contact with each other so that they could be driven
It consists of. The first switch 14 also has a similar well-known structure. Next, reference numeral 19 denotes a shaft rod attached to the cases 1 and 2 parallel to the main shaft 5, 20 and 21 denote first and second drive gears rotatably attached to the shaft rod 19, and 22 denotes a drive gear. A transmission gear is formed integrally with the gear 21, and each of these gears meshes with other gears as shown.

Next, 23 is a timer motor, which is fixed to the case 2 by a fastener 24 made of a flexible material. 25 is a pinion attached to the rotating shaft of the timer motor 23, and 26 is a reduction gear train, which is configured to reduce the rotation of the pinion 25 along the path shown by the arrow and transmit it to the first drive gear 20.

Next, 27 is a manual operation knob attached to the main shaft 5, and 28 is a sealing member, which is provided to prevent water from entering the inside of the case from between the case 1 and the main shaft 5. Yes, it is made of an elastic material.

In the case of the above configuration, the timer motor 2
3 operates and the pinion 25 rotates, the first drive gear 20 rotates via the gear train 26. Following this rotation, the first driven gear 7 also rotates. Therefore, the cam 6 also rotates together, and the first switch performs switching or opening/closing operations. The rotation speed (rotation cycle) of the first cam 6 is set to, for example, several tens of seconds to several minutes. Next, the transmission gear 8 also rotates together with the first cam 6. This rotation is transmitted to the transmission gear 22 at a reduced speed, and the second drive gear 21 rotates at a lower speed. This rotation is further decelerated and transmitted to the second driven gear 11, and the gear 11 rotates extremely slowly. This rotation is transmitted to the second cam 10 via the clamping members 12, 13 and the cam boss 9, and the second cam 10 slowly rotates. As a result, the second switch 15 is driven by the second cam 10 to perform switching or opening/closing operations. Note that the rotation speed (rotation cycle) of the second cam 10 is set to, for example, several minutes to several tens of minutes.

As described above, in this invention, when both the first and second cams 6, 10 are rotated, the transmission gear 8 that rotates integrally with the first cam 6 and the transmission gear 22 that meshes with the transmission gear 8 are used. The second drive gear 21 is driven by decelerating the second drive gear 21, and the rotation is further decelerated and transmitted to the second cam 10. Therefore, two types of cams provided on the axis of one main shaft 5 are used. However, it has the advantage that they can be rotated at significantly different speeds. This means that the first cam 6 can be used as a short-cycle cam such as a reversing cam, and the second cam 2 can be used as a long-cycle cam such as a timed cam for program operation. It has utility in meeting different timed operation requirements.

Moreover, even if the speeds of the first cam 6 and the second cam 10 are made different, the sudden rotation of the motor 23 is decelerated using a plurality of gears and is transmitted to the second cam 10 rotating the slowest. Since the gears 7 rotate the first cam 6 at different speeds, even if only the reduction gear train for the second cam 10 is used, the first cam 6, which requires a faster rotational speed than the second cam 10, can rotate the first cam 6 at different speeds. It also has the effect of making it possible to rotate the cam 6.
There is an economical effect in that there is no need for a speed increasing gear mechanism for rotating the first cam as in the prior art.

Furthermore, in the present invention, in the arrangement of gears for deceleration, a transmission gear 8 for deceleration is provided on the second cam side of the first cam and on the first drive gear side of the second drive gear, respectively. 22 are coaxially and rotatably attached to the first cam and the second drive gear, respectively, and the two transmission gears are configured to mesh with each other, as shown in FIG. The deceleration gear consisting of the first driving gear 20 and the first driven gear 7 is unevenly distributed on one side of the main shaft 5 in the axial direction, and the deceleration gear consisting of the second driving gear 21 and the second driven gear 11 The gears will be unevenly distributed on the opposite side from the above. If this is repeated, as is clear from FIG. The second drive gear 21 for meshing with the second drive gear 21 is also unevenly located on the other side 1 of the case. As a result, the first drive shaft 20 is attached to one side of the shaft rod 19, which is supported at both ends by the cases 2 and 3, and the second drive gear 21 is attached to the other side. be able to. As a result, the first and second
Even in the case where both the second drive gears 20 and 21 are arranged, there is an effect that each gear is supported by the shaft rod 19 that is supported on both sides. As a result, it is helpful to solve the conventional drawback that the shaft rod 19 wobbles and becomes disengaged during the meshing rotation with the mating driven gears 7 and 11.

Also, inevitably, among the reduction gears, numbers 20 and 7,
Even if three sets of reduction gears, 8 and 22 and 21 and 11, each of which can provide a large reduction ratio, are housed on the axis of the shaft rod 19 and the main shaft 5, the structure can be put to practical use. This reduces the number of reduction gears arranged in the direction perpendicular to the axis (the direction that occupies the largest area for gears), reduces the area they should occupy, and makes the timer more compact. There is an effect that can be contributed.

In this case, the two cams 6 and 10 arranged in tandem with respect to the main shaft 5 can of course be rotated at two slow speeds. The reduction gears for rotating the cam 6 are stacked in three stages in the axial direction of the main shaft, making it possible to significantly reduce (compact) the area in the above direction.Moreover, the drive for the fast cam 6 is carried out in the middle of deceleration. Since this is done by configuring the first driven gear 7 to be able to rotate in the same manner, there is no need for a special gear for rotating the gear, which has a great effect in suppressing an increase in the number of parts.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal cross-sectional view of a timer, and FIG. 2 is a directional view showing one case removed. 5...Main shaft, 6...First cam, 10...Second cam, 7...First driven gear, 20...First drive gear, 11...Second driven gear, 21...Second drive gear , 8, 22... Transmission gear.

Claims (1)

[Scope of utility model registration request] First and second cams are rotatably disposed in tandem on the main shaft, and a first driven gear is coaxially attached to the first cam, and a second driven gear is coaxially attached to the second cam. and a shaft rod supported by a case at both ends is disposed on an axis parallel to the axis of the main shaft, and first and second drive gears are mounted on this shaft rod. The first and second driving gears are rotatably disposed in tandem, and the first and second driving gears are individually and deceleratingly meshed with the first and second driven gears, respectively, and the first driving gear is connected to the first driving gear. A timer motor is connected to the second cam side of the first cam and the first cam side of the second drive gear.
On the side of the driving gear, transmission gears for deceleration are respectively attached to the first cam and the second driving gear so that they can rotate in the same manner and coaxially, and both transmission gears are meshed with each other. A timer featuring