JP2694237B2 - Speed control mechanism - Google Patents

Description

The present invention relates to a speed control mechanism used in a timer.

[Conventional technology]

It has a rotatable escape wheel and a vibrating body that is reciprocally rotatable and has two engaging pieces, and the two engaging pieces are provided on the periphery of the escape wheel by the reciprocating rotation of the vibrating body. It is made to face the peripheral edge of the escape wheel so that it can be engaged and disengaged alternately with the tooth being held, and one end of the balance spring for frequency stabilization is connected to the vibrating body, and the other end is fixed, for example, in a case. There is a structure that is fixed to an object.

[Problems to be solved by the invention]

In the speed control mechanism having such a structure, good time accuracy can be obtained by the hairspring. However, because of the structure of the hairspring, it is difficult to accurately establish the positional relationship between one end and the other end. Therefore, simply assembling the balance spring at the time of assembling the speed control mechanism causes the reciprocating rotation position of the vibrating body to deviate from the predetermined position, and the engagement of the two engaging pieces of the vibrating body with respect to the teeth of the escape wheel. There is a problem that removal becomes unbalanced and time accuracy deteriorates. Therefore, after assembling the hairspring, a troublesome adjustment must be made such as changing the fixing position at the other end of the hairspring so that the reciprocating rotation position of the vibrating body comes to a predetermined position. was there.

The present invention has been made in view of the above points, and it is an object of the present invention to achieve a highly accurate speed control mechanism by using a spring for frequency stabilization. Even if a spring is used, it is to provide a speed control mechanism having a structure in which it is sufficient to simply mechanically incorporate the spring when assembling the speed control mechanism.

[Means for solving the problem]

In order to achieve the above object, the present invention employs the means described in the claims, and the operation is as follows.

[Action]

When rotational force is applied to the escape wheel, the rotational force is applied from the teeth of the escape wheel to the engaging piece of the vibrating body, and the vibrating body reciprocates. By the reciprocating rotation of the vibrating body, the two engaging pieces of the vibrating body alternately engage and disengage from the teeth of the escape wheel. As a result, the escape wheel is chopped. When the vibrating body makes a reciprocating rotation, the frequency stabilizing spring repeatedly absorbs the rotational energy of the vibrating body and gives the absorbed rotational energy to the vibrating body again, resulting in vibration. The body frequency is stabilized.

〔Example〕

Hereinafter, drawings showing an embodiment of the present application will be described. First
In FIGS. 3 to 3, reference numeral 1 denotes a time switch, which is composed of members 2 to 7 as is well known. Of these, 2 is a base frame, which is composed of a case 2a and a main plate 2b. Reference numeral 3 denotes a rotatable main shaft, to which a driving mainspring is connected, as is well known. 4 is a speed control mechanism, 5 is a gear train connecting the main shaft 3 and the speed control mechanism, 6 is a cam attached to the main shaft 3, 7 is a switch, and a fixed contact plate 7a and a movable contact plate
7b, and a driven lever 8 is connected to the cam 6.

Next, the speed control mechanism 4 will be described. Reference numerals 11 to 22 denote well-known members. Reference numeral 11 denotes an escape wheel, which has a large number of teeth 11a on its peripheral edge and a gear 11b that integrally rotates as shown in FIG. 3, and connects it to the gear train 5. 12
Represents a vibrating body, and in the present embodiment, is constituted by an ankle 13 and a balance 14. The pallet fork (13) is adapted to be capable of reciprocating rotation about a support shaft (15) provided at the substantially central portion thereof, with engagement pieces (16, 17) at one end and a balance (14) at the other end. Each of them is provided with a connecting portion 18 (also called a ken tip) for connecting with (see FIG. 4). Then the balance
14 will be described. 20 is a stem, 21 is a top wheel, and 22 is a connecting piece (also called swing pin), which is attached to a support piece 22a formed integrally with the stem 20, and by engaging with the connecting portion 18, the ankle 13 And the balance 14 are interlocked and reciprocally rotated.

Next, a spring for stabilizing the frequency and a structure related thereto, which are linked to the vibrating body 12, will be described. Reference numeral 25 is a frequency stabilizing spring, which is a U-shaped spring having two spring legs 26 and 27, and the base portion 25a is fixed to a fixing member 28 provided on the pallet fork 13. . Reference numeral 30 is a spring pad provided on the balance 14 and is integrally formed with a support piece 31 which is formed by being drawn from the stem 20. Spring foot 2 in the above spring
The relationship between 6,27 and the spring pad is as follows. That is, first, the rest positions of the pallet fork 13 and the balance 14 are
Two engaging pieces as shown in FIG. 4 (a) or (g)
It is set at a position where the teeth of the escape wheel & pinion 16 and 17 are evenly meshed with each other. In the state where the balance 14 is in the rest position, the free ends of the one and the other spring legs 26 and 27 are moved to one side of the spring pad 30 by the reciprocating rotation of the balance 14 (see FIG. )) And the swinging position on the other side (the position shown in FIG. 4 (e)), the position is equidistant from the intermediate position. The stopper member 28 fixes the spring 25 in a state where the above-mentioned positional relationship is achieved.

Next, reference numeral 33 shown in FIG. 2 indicates a regulation means for regulating the reciprocating rotation width of the balance 14. Explaining the restricting means 33, 34 is a window formed in the main plate 2b, and restricting portions 34a and 34b are formed with one and the other window edges. 36
Is a projecting piece integrally formed with the support piece 31, is located in the window 34, and is adapted to restrict excessive rotation of the balance 14 by contacting the restricting portion 34a or 34b. . Next, 37 and 38 shown in FIG. 1 are receiving members provided in the middle portion of the pallet fork 13, and are shown in FIGS. 4 (d), (e),
As shown in (j) and (k), by supporting the middle portion of the spring foot 27 or the spring foot 26 when it is bent,
The springs 27 and 26 are provided so as to increase the spring force.

When assembling the spring 25 at the time of assembling the speed control mechanism having the above-described structure, as shown in FIG. 1 or FIG. 4 (a),
Position both spring legs 26, 27 of the spring 25 on both sides of the spring pad 30,
In this state, the base portion 25a is fixed to the fixing member 28. In this case, since the spring 25 is a U-shaped symmetrical one, the error in manufacturing thereof is extremely small. Therefore, the pallet fork 13 and the balance 14 can be left with only the assembling as described above.
Shows the state as shown in FIG. 4 (a), that is, the state where the stationary position is designed.

Next, the operation of the time switch having the above configuration will be described. When the main shaft 3 is rotated by the setting operation, the switch 7 is closed and the biasing force is accumulated on the mainspring. The urging force is applied from the main shaft 3 through the gear train 5 to the escape wheel of the speed control mechanism 4.
Join 11 Then, the escape wheel & pinion 11 and the vibrating body 12 in the speed governing mechanism 4 operate as described later, and the escape wheel & pinion 11 is fed at a predetermined speed. As a result, the main shaft 3 rotates at a constant speed in the return direction opposite to the rotating direction at the time of setting. When the time set by the setting operation of the spindle 3 elapses, the switch 6 is opened by the cam 6.

Next, the operation of the speed control mechanism 4 will be described with reference to FIG.
The operations of the escape wheel 11, the pallet fork 13, and the balance wheel 14 are the same as those known in the art, and the escape wheel 11 is sent by repeating the operations shown in order in FIGS. 4 (a) to (l). Briefly speaking, when a rotating force in the direction of the arrow in FIG. 4 (a) is applied to the escape wheel 11, the rotating force is transmitted from the teeth 11a to the engagement pieces 16 and 17, and the pallet fork 13 and the balance wheel 14 reciprocally rotate. To do. As a result, the engagement pieces 16 and 17 alternately engage and disengage from the tooth 11a,
The escape wheel 11 is sent in increments.

In the above case, the function of the spring 25 for stabilizing the frequency is as follows. In the processes shown in (a) to (e) and (g) to (k), the spring pad 30 contacts the spring foot 27 or the spring foot 26, and the spring foot bends as shown. As a result, the spring feet absorb and store the rotational energy of the balance. On the other hand, in the process shown in (e) to (g) and (k) to (a), the spring foot 27 or the spring foot 26 pushes back the energy accumulated by the bending by the spring pad 30 to return the balance to the balance.
Give again. As a result of repeating such an action, the frequency of the balance 14 (the number of reciprocating rotations per unit time) is stabilized, and as a result, the speed of the feed of the escape wheel 11 is stably maintained.

The reciprocating rotation of the balance wheel is shown continuously as shown in FIGS. 5 (A) and 5 (B), and (a) to (l) are shown in FIGS. 4 (a) to (l), respectively. It shows the point that becomes the state of.

Next, FIG. 6 shows a different embodiment of the present application, and shows an example in which the base portion 25ae of the spring 25e for frequency stabilization is held by the base frame 2e. In this example, the vibrating body
12e is composed only of balance 14e without using pallet fork 13e, and engaging pieces 16e, 1e for engaging and disengaging with teeth 11ae of escape wheel 11e.
7e may be attached to the top wheel 21e of the balance 14e.

In addition, portions that are considered to have the same or equivalent configuration as those in the previous figure in terms of function are denoted by the same reference numerals as in the previous figure with the letter e, and redundant description is omitted.

〔The invention's effect〕

As described above, according to the present invention, when rotational power is applied to the escape wheel 11, the escape wheel 11 can be chopped and fed by the vibrating body 12 that reciprocally rotates at the frequency stabilized by the spring 25. In addition to the feature that the rotation of 11 can be controlled at a constant speed, when assembling the spring 25 at the time of assembly, the spring 25 is symmetrical and the position of both spring feet 26, 27 is not dispersed. Since a U-shaped spring that is hard to occur is used, the mechanical design of the vibrator 12 is planned by simply assembling it mechanically to position both spring legs 26 and 27 at the same distance from the spring pad 30 of the vibrator 12. It is possible to reciprocally rotate at the above position, and there is an effect that the assembling work can be facilitated.

[Brief description of the drawings]

The drawings show an embodiment of the present application. FIG. 1 is a partially cutaway front view of a time switch, FIG. 2 is a front view showing a reciprocating rotation width regulating means of a balance wheel, and FIG. 3 is III of FIG. A view showing a state in which the base frame and the top wheel are broken at the position of the line III, FIGS. 4 (a) to 4 (l) are operation explanatory views of the speed governing mechanism, and FIGS. The figure which shows a rotating position in order, 6th
The figure is a partially broken perspective view showing a different embodiment. 11 …… escape wheel, 11a …… teeth, 12 …… vibrating body, 16, 17 ……
Engagement piece, 25 ... Spring for stabilizing frequency, 26, 27 ... Spring foot, 30 ... Spring pad.

Claims (1)

(57) [Claims] 1. A rotatable escape wheel and a vibrating body which is reciprocally rotatable and has two engaging pieces, and the two engaging pieces are reciprocally rotated by the vibrating body. In the speed control mechanism, which is opposed to the periphery of the escape wheel so that the teeth provided on the periphery of the car can be alternately engaged and disengaged, and a spring for stabilizing the frequency is connected to the vibrating body, The spring is a U-shaped spring having two spring legs, and the connection of the spring to the vibrating body is provided with a spring pad on the vibrating body, and each free end of the two spring legs is Positions on both sides of the spring pad where the spring pads can alternately come into contact with their free ends by reciprocating rotation of the vibrating body, and at positions equidistant from the intermediate position between the swing positions on one side and the other side of the spring pads. A speed control mechanism characterized by being located at.