JPH044344Y2 - - Google Patents

Description

[Detailed description of the invention] The invention of the present application aims to solve the following problems.

(Industrial Application Field) This invention relates to a timer, and more specifically, to a timer having a slip mechanism for transmitting and interrupting force between a main shaft and a timer motor.

(Prior art) In a slip mechanism installed in the gear train of a conventional timer, the inner periphery of a thin ring body connected to the gear on the side connected to the timer motor is formed into an annular shape on the gear connected to the main shaft side. A device that is pressed against the outer periphery of the body has a problem in that the contact portion between the two easily deforms due to wear, and when this deforms, it becomes impossible to transmit force.

(Problems to be solved by the invention) This invention aims to provide a timer having a slip mechanism which eliminates the above-mentioned conventional problems and allows stable operation over a long period of time with little deformation of the slip part. That is.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention consists of a rotatable main shaft for time setting, a cam attached to the main shaft for operating a switch, a timer motor, and a combination of the main shaft and the timer motor. In a timer equipped with a gear train consisting of a plurality of gears interposed for transmission, at the position of the second wheel in the gear train, the gear on the main shaft side with respect to one support shaft A gear connected to the motor side and a gear connected to the motor side gear are arranged coaxially, and between the two gears, a recess with a circular planar shape is formed concentrically with the gear on the opposing surface of one of the gears. In addition, in the recess, a spring body having an annular shape with a part of its periphery open and having elasticity that spreads outward and whose outer circumferential surface is a wide sliding surface is placed in the recess. The surface is placed in pressure contact with the inner circumferential surface of the recess, and the other gear and the spring body are connected so as to be integrally rotatable by a pair of engagement elements respectively provided thereon. A slip mechanism is interposed to provide a timer, the operation of which is as follows.

(Operation) The gear train and main shaft rotate at a constant speed due to the operation of the timer motor, and the switch is operated for a limited time by the cam.
On the other hand, when the main shaft is manually rotated, a slip occurs between the wide outer circumferential surface of the spring body and the inner circumferential surface of the recess of the gear, and the transmission of rotational force from the main shaft to the timer motor is interrupted.

(Example) Below, drawings showing examples of the present application will be described. Reference numeral 1 denotes a case, which is constructed by bonding together case elements 2 and 3, each made of a synthetic resin material. 4 and 4a indicate bearings provided in the case elements 2 and 3. A main shaft 5 is rotatably mounted on bearings 4 and 4a. 6 is a cam rotatably mounted on the bearing 4, and a connecting piece 8 formed integrally with this cam is attached to 1.
It is placed in a linking recess 7 provided in the number wheel 13 so that it can rotate in conjunction with the main shaft 5. 9
1 shows a well-known switch that can be driven by and faces the cam 6.

Next, 11 is a gear train whose one end is connected to the main shaft 5, and 12 is a timer motor, which is connected to the other end of the gear train 11. The gear train 11 includes gears such as a first wheel & pinion 13 integrally formed with the main shaft 5, a second wheel & pinion 14, a third wheel & pinion 15 sequentially connected thereto, and a motor pinion 16 attached to the rotating shaft of the timer motor 12. It is configured.

Next, the second wheel & pinion 14 interposed in the gear train will be further explained. This second wheel also serves as a slip mechanism, 20 is a support shaft attached to the case 1, 21 is a gear, and a boss 22 is rotatably attached to the support shaft 20. As is clear from FIG. 2, this gear 21 is connected to the third wheel 15 on the timer motor side. 23 is a recess formed in the gear 21, and has a circular planar shape. 2
4 indicates the inner circumferential surface of the recess 23. 25 is a spring body,
It is formed by molding a band-shaped spring material into an annular shape having an opening 26 in a part of its periphery, and has elasticity that expands outward. Reference numeral 27 indicates a wide sliding surface on the outer peripheral surface of the spring body 25. 28, 28 are spring bodies 25
It shows an engagement element formed by bending both ends of the . The spring body 25 is left in the recess 23 with its sliding surface 27 in pressure contact with the inner circumferential surface 24 . A gear 30 is rotatably mounted on the support shaft 20 and is meshed with the first wheel and pinion 13 on the main shaft 5 side.
31 is an intervening body integrally formed with the gear 30, and the boss 22
and the spring body 25. Reference numeral 32 designates an engaging element integrally formed with the intervening body, and is located between the engaging elements 28 of the spring body 25. Reference numeral 33 denotes a floating prevention piece for preventing the spring body 25 from floating up from the recess 23.

In the case of the above configuration, the timer motor 12
When the rotating shaft rotates by energizing the
The rotational force is transmitted to the main shaft 5 via the gear train 11, and the main shaft 5 rotates. As a result, the cam 6 also rotates, and the switch 9 is opened and closed at a predetermined time. In this case, in the slip mechanism 14 in the gear train, the gear 21 and the spring body 25 rotate together due to the frictional force between the inner peripheral surface 24 and the sliding surface 27, and are further engaged with the engagement element 28. The rotational force is transmitted to the other gears 30 by engagement with the element 32 . And the gear 30
The turning force is transmitted to the first wheel and pinion wheel 13.

On the other hand, when rotating the main shaft 5 manually, the rotational force is transmitted from the first wheel 13 to the gear 30. The rotation of the gear 30 is transmitted to the spring body 25 through the engagement between the engagement elements 32 and 28. However, gear 21
is connected to the timer motor 12 via the third wheel 15 and many other gears, and the presence of this timer motor causes an extremely large load.
Therefore, a slip occurs between the sliding surface 27 and the inner circumferential surface 24, and the main shaft 5 and timer motor 12 are disconnected. Therefore, the timer motor load on the main shaft 5 is eliminated, and the main shaft 5 can be rotated with a small force.

(Effects of the invention) As described above, in the present invention, when operating the main shaft 5, the timer motor 12
It has the feature that the main shaft 5 can be rotated at a constant speed via the .

On the other hand, when rotating the main shaft 5 manually, the spring body 25
A slip occurs between the gear 21 and the gear 21, and the transmission of rotational force from the main shaft 5 to the timer motor 12 can be interrupted midway, and the main shaft 5 can be easily operated manually.

Moreover, even if the slip occurs in the gear train as described above, the slip occurs at the wide contact surface between the sliding surface 27 of the spring body 25 and the inner circumferential surface 24 of the recess of the gear 21, which are in surface contact with each other. Because of this, deformation due to wear at both ends is extremely small compared to conventional products. This means that even if the manual operation described above is repeated over a long period of time, the change in frictional resistance between the sliding surface 27 and the inner circumferential surface 24 can be reduced, and the accurate timed operation described above can be maintained. It also has the effect of allowing manual operation with light force to be performed stably over a long period of time.

Furthermore, even if the two surfaces 27 and 24 are slightly worn, the spring body 25 will expand accordingly.
There is also the effect that the change in frictional resistance between the surfaces 27 and 24 can be reduced, the quality can be maintained constant, and the above-mentioned long-term use can be made possible.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application. Fig. 1 is a partially cutaway plan view of a timer with one case element removed, and Fig. 2 shows the timer of Fig. 1 passing through the axes of many gears. Vertical cross-sectional view (2
Regarding the number wheel, the cross section at the - line position in Figure 3 is shown), Figure 3 is a plan view of the second wheel, and the fourth wheel.
The figure is a longitudinal sectional view of the spur gear, FIG. 5 is a plan view of the spring body, and FIG. 6 is a front view of the spring body. 5...Main shaft, 6...Cam, 9...Switch, 1
1...Tooth gear train, 12...Timer motor, 21,3
0...gear, 23...recess, 25...spring body.

Claims (1)

[Scope of utility model registration request] A rotatable main shaft for time setting, a cam attached to the main shaft for operating a switch, a timer motor, and a plurality of gears interposed between the main shaft and the timer motor for power transmission. In a timer equipped with a gear train, at the position of the second wheel in the gear train, a gear connected to a gear on the main shaft side with respect to one support shaft, and a gear connected to a gear on the motor side. are arranged coaxially, and between the two gears, a recess with a circular planar shape is formed concentrically with the gear on the opposing surface of one of the gears. A spring body having an open annular shape and having elasticity that spreads outward and whose outer peripheral surface is a wide sliding surface is left in a state where the sliding surface is in pressure contact with the inner peripheral surface of the recess. In addition,
A timer characterized in that the other gear and the spring body are interposed by a slip mechanism in which a pair of engagement elements provided on the other gear are linked so as to be integrally rotatable.