JPS5820945Y2 - Transmission mechanism elements in timers - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission mechanism interposed between a camshaft and a clock mechanism in a timer.

This type of transmission mechanism must have a structure that allows the camshaft to be rotated manually to set the timer, and then the camshaft to be rotated at a constant speed by the clock mechanism. There is.

For this purpose, a clutch mechanism or a transmission mechanism such as a friction plate is used to rotate the camshaft in the set direction without adversely affecting the clock mechanism, and the clock mechanism rotates the camshaft at a constant speed. When moving, the rotation is made to occur extremely smoothly.

However, some types are bulky and require a large number of parts, requiring a large amount of assembly costs, and some are simplified, but have various problems in terms of reliability and accuracy. Due to the problem of small size,
There has been a desire for a transmission mechanism with a structure that is robust and can be provided at low cost.

Therefore, the present invention has been made to meet the above-mentioned needs, and is intended to provide a transmission mechanism that is small, strong, and easy to assemble.

The drawings showing the embodiments of the present application will be described below.

Reference numeral 1 denotes a pinion, which is usually engaged with a gear on the camshaft side that is rotatably provided in a timer.

Next, in a pinion shaft 2 coaxially protruding from the pinion 1, 2a is a shaft rod, and both ends thereof are formed in a generally known manner.

Although the shaft rod 2a is designed to rotate together with the pinion 1, they may be rotated relative to each other.

Reference numeral 3 denotes a meshing portion connected to the pinion 1 in the axial direction thereof, and has a large number of projections and depressions formed on its outer periphery.

These irregularities are formed so that the concave portions are located on the extension line of the valley of the pinion teeth 1', and are formed at the same time as the gear cutting of the pinion 1.

Further, its axial length is slightly longer than the sum of the thicknesses of the click plate and the boss, which will be described later.

Note that the pinion 1, shaft 2, and meshing portion 3 are integrally formed using a metal material.

Next, in the click plate 5, 6 is a base, 7 is a center hole, and the inner periphery is formed to match the unevenness so as to be able to engage with the unevenness in the above-mentioned engaging portion 3.

8 is an arm part, and 9 is a retaining piece, which is inclined toward the spur gear mentioned above.

Note that the click plate 5 is formed using a flat plate-like flexible metal material.

Reference numeral 10 denotes a spur gear, which is meshed with a gear on the clock mechanism (regulating mechanism, timer motor, etc.) side of the timer.

12 is a center hole, 13 is a retaining hole illustrated as an engaging part,
A large number of them are arranged on the circumference around the axis of the spur gear 10.

Next, 14 is a boss, and 16 is a cylindrical portion, the length of which is slightly larger than the wall thickness of the spur gear 10.

Reference numeral 17 indicates a flange portion, which is provided to prevent the spur gear 10 from coming off.

The assembly of the above structure will be explained.

First, the click plate 5 is attached to the meshing part 3.

In this case, as shown in FIG.
The concave portion 7a and the convex portion 7b are engaged with the convex portion 3a and the concave portion 3b of the engaging portion 3, respectively, and the click plate 5 is fitted so as to come into contact with the end surface 1'' of the pinion 1.

Next, the meshing portion 3 is connected to the center hole 12 of the spur gear 10 and the boss 14.
are inserted through the through holes 15 in this order.

At this time, the spur gear 10 is closely attached to the click plate 5, and the cylindrical portion 16 of the boss 14 is connected to the center hole 12 of the spur gear 10.
The tip end surface is brought into contact with the click plate 5.

In this case, the spur gear 10 and the boss 14 may be assembled first, and then these may be attached to the meshing portion 3.

Next, as shown in FIG. 1, the end of the engaging portion 3 is caulked to the boss 14 by a well-known method.

As a result, the pinion 1, the click plate 5, and the boss 14 are each firmly and integrally fixed to each other, and the engagement piece 9 of the click plate 5 is in pressure contact with the spur gear 10.

Next, the movement of the transmission mechanism assembled as described above when attached to a timer whose driving source is a spring attached to a camshaft will be explained.

First, when the camshaft of the timer is manually rotated in the time setting direction, the pinion 1 is rotated in the direction of arrow 20 shown in FIG.

At this time, since the engaging piece 9 of the click plate 5 is in an inclined state as shown, it does not mesh with the engaging portion 13 of the spur gear 10, but slides on the spur gear 10.

Therefore, the pinion 1 rotates separately from the spur gear 10, allowing the camshaft to rotate easily.

Next, after setting the time limit as described above, when the camshaft is rotated in the opposite direction by the spring, the pinion 1 is rotated in the direction of the arrow 21, and the engaging piece 9 of the click plate 5 is rotated. Fits into the engaging portion 13 of the spur gear 10, and the tip 9a of the engaging piece 9
comes into contact with the inner wall surface 13a of the engaging portion 13.

As a result, the spur gear 10 rotates integrally with the pinion 1, and a speed regulating mechanism (escape wheel, crown gear, etc.) connected to the spur gear 10 operates.

Therefore, the camshaft is rotated at a constant speed.

In the transmission mechanism, the pinion 1 and the click plate 5 are firmly integrated as described above, so that they can withstand the shock during the above-mentioned reverse rotation well and can operate without rattling.

Next, the operation when this transmission mechanism is attached to a timer that uses a motor as a driving source will be explained.

First, the time limit is set by smoothly rotating the camshaft as in the case described above.

Thereafter, the driving force of the motor is transmitted to the spur gear 10, and the spur gear 10 is rotated in the direction of arrow 20.

In this case, the engaging portion 13 of the spur gear 10 and the retaining piece 5 of the click portion 5 engage as described above, the spur gear 10 and the pinion 1 rotate together, and the cam shaft connected to the pinion 1 rotates as a unit. Rotated.

As described above, in this invention, the pinion 1 and the spur gear 10 are connected via the click plate 5, so when rotating the camshaft of the timer in the setting direction, the spur gear 10 is connected to the pinion 1 through the click plate 5. It is possible to rotate only the pinion 1 and a separate body from the camshaft 10, which has the advantage of enabling light rotation of the camshaft.

On the other hand, when the camshaft is rotated in the opposite direction to that described above, the pinion 1 and the spur gear 10 rotate integrally, and as a result, the camshaft can be rotated at a constant speed under the control of the clock mechanism. It has its features.

Moreover, as described above, even if the pinion 1 and the spur gear 10 are capable of relative and integral rotation, the configuration is such that a flat click plate 5 is attached to one surface of the spur gear 10. Since the above function can be achieved with an extremely small structure in which the pinion shaft is inserted through the center hole of both of them, it is suitable for being built into a narrow space like a timer, and it can be used to improve the timer's performance. This has a significant effect on increasing the possibility of miniaturization.

Furthermore, as described above, the timer is constructed so as to be miniaturized, and when assembling it, as described above, the timer has to be attached to the center hole of each of the spur gear 10 and the click plate 5 attached thereto. Since it is extremely easy to assemble by simply inserting the pinion shaft, it requires less work and has the practical effect of being able to be provided at a low cost.

Furthermore, in the present invention, even though the timer can be miniaturized and easily assembled as described above,
The connection between the click plate 5 and the shaft of the pinio/1 is to engage the many unevennesses of the engaging portion 3 on the shaft with the many unevennesses of the center hole 7 in the click plate 5 formed correspondingly. Therefore, they are extremely rigid in the direction of rotation, and even if they are subjected to a large impact force in the direction of rotation, they can withstand it well and have the effect of improving strength and accuracy so that they can be rotated together with less wobbling.

Furthermore, an excellent feature of the present invention is that even if the meshing part 3 is provided with a large number of concave and convex portions as described above, and sufficient consideration is given to strength, the meshing part 3 is
Since the concave part of the meshing part 3 is located on the extension line of the tooth valley of the pinion 1, the formation of the meshing part 3 is simultaneous and continuous with the formation of the teeth 1' of the pinion 1. This method eliminates the need for extra machining effort, making it possible to provide the product at a low cost, and also has the advantage of producing an accurate meshing portion 3.

Furthermore, in the present invention, since the flat click plate 5 is used, its spring properties are soft, and when the pinion 1 and the spur gear 10 are rotated separately as described above, they can be rotated with a light force. It has its features.

Moreover, even if such a rick board is used,
The entire circumference of the center hole 7 is provided with a large number of unevenness evenly, and this portion is pressed down by the cylindrical portion 16 of the boss 14 over the entire circumference, so that the pinion 1 is connected to the pinion 1 via the click plate 5. When transmitting rotational force from one of the gears 10 to the other, the click plate 5 is prevented from twisting and the force is equally transmitted to each of the plurality of retaining pieces 9 provided around the click plate 5. It has the advantage of being able to perform

This has the effect that the click plate 5 can be made even thinner to further enhance the above-mentioned light rotation.

Moreover, even if the periphery of the center hole 7 in the click plate 5 is directly pressed by the cylindrical portion 14 as described above, it is difficult to fit the spur gear 10 along the click plate 5 in a rotatable manner. In this case, the inner periphery of the spur gear 10 can be located in the area surrounded by the click plate 5, the cylindrical part 16, and the flange part 17, and the spur gear 10 can be aligned parallel to the click plate 5 so as to be smooth. It also has the effect of making it possible to rotate.

Furthermore, in the civil engineering design, the boss 14 was
When caulking as shown in Fig. 1, the deformation (
Since the caulking is performed at the end of the engaging part 3 which has a plurality of irregularities, each of the surrounding protrusions deforms with a light force, which has the effect of making the caulking work easier. It also has the effect of preventing damage to the thin click plate 5, boss 14, or gear 10 due to large impact.

Furthermore, even if the spur gear 10 is to be rotated around the outer periphery of the meshing portion 3 which has many irregularities due to the above-mentioned configuration, the presence of the cylindrical portion 16 as described above makes it difficult for the spur gear 10 to rotate. This has the effect of enabling smooth rotation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially cutaway front view of the transmission mechanism, FIG. FIG. 6 is a diagram showing a state of engagement between the unevenness and the unevenness in the engagement portion. 1...Pinion, 2...Shaft, 3...
...Meshing part, 5...Kutsutsuku plate, 7...
...Center hole, 9...Engagement piece, 10...
Spur gear, 13... Engagement part.

Claims (1)

[Scope of utility model registration request] The camshaft has a rotatable camshaft, a clock mechanism is connected to the camshaft via a transmission mechanism, and the camshaft can be rotated at a constant speed for use in a timer. The transmission mechanism element includes a pinion connected to the camshaft, a flat click plate, a boss, and a spur gear connected to the clock mechanism. A fitting part having a diameter smaller than the diameter of the pinion is coaxially protruded from one end, and the length of the fitting part is formed to be slightly longer than the sum of the thickness of the click plate and the thickness of the boss, Furthermore, the outer circumferential surface of the meshing portion is provided with a large number of recesses and protrusions evenly circumferentially, and these recesses are located on the extension line of the tooth valley of the pinion, and the central part of the spur gear is provided with a large number of recesses and protrusions evenly distributed in the circumferential direction. While forming a center hole with a diameter larger than the diameter of the meshing part, one surface of the spur gear is provided with a plurality of engagement parts, and the center hole provided in the center of the click plate corresponds to the meshing part. In addition, a plurality of engaging pieces are provided at equal intervals around the click plate at positions where the click plate can be engaged with the above-mentioned retaining portion, and the retaining pieces do not hold the click plate. If it is rotated in one direction, it will not engage with the engagement part of the spur gear, and if it is rotated in the opposite direction, it will be tilted in a direction that will mesh with the engagement part, and the retaining piece will The boss has elasticity so that it can be brought into elastic pressure contact with the spur gear. a flange having an outer diameter larger than the diameter of the center hole of the gear, the center hole of the click plate is fitted into the meshing portion, and the boss is fitted into the meshing portion at the tip of the cylindrical portion. is fitted in such a manner that it is in contact with the click plate, and the spur gear is installed on the outer circumferential side of the cylindrical portion so as to be along the 3-' tooth plate. A transmission mechanism element in a timer, characterized in that the pinion and the boss can be integrated by caulking an end on the opposite side of the pinion to the boss.