JPH0714951Y2 - Electronic clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the configuration of a hairspring unit of a swivel hand movement timepiece.

[Conventional technology]

The structure of a hairspring unit of a conventional electronic timepiece is disclosed in Japanese Patent Laid-Open No. 54-460.
As shown by 76, the bent portion 10a of the balance spring 10 shown in FIG. 2 is fixed by a pin 9g, and the beard pinion 11 and the beard gear 9 are freely rotatable.

[Problems to be solved by the invention]

However, in the above-mentioned conventional technique, the outer end of the balance spring is fixed at only one point of the pin portion, so winding disorder occurs due to a drop-like impact, and in particular, when the balance spring is involved due to overload, the disorder occurs. There was a serious problem that the hairspring was plastically deformed. Furthermore, since the torque is transmitted in the rotational direction and the impact resistance is secured by only one point, it is necessary to use a firm fixing method such as caulking, which is an obstacle to automation and cost reduction.

Therefore, an object of the present invention is to provide a hairspring structure which is excellent in impact resistance and fool loop resistance against overload, and which can be easily automated and reduced in cost.

[Means for solving problems]

The electronic timepiece of the present invention has a control means for accumulating intermittent rotational energy as elastic deformation of the hairspring 10 and smoothly releasing the rotational energy. The outer end radius γ of the hairspring 10 is larger than the radius R of the hairspring 9 in the assembled state.

〔Example〕

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 4 is a plan view of the balance spring portion of FIG. 1, in which the bent portion 10a is engaged with the groove portion 9c of the beard gear 9 to regulate the rotation direction, The wall portion 9d regulates the position in the radial direction, and the regulating portion 9e prevents vertical movement of the hairspring. A viscous rotor 14 that receives a viscous load of viscous fluid is used as the control means. Reference numeral 21 is a base plate, 1 is a coil for generating a magnetic field for driving the rotor 5 via the stator 4 and the magnetic core 2, and is fixed by a screw 3. A bevel gear 11 and a bevel spring 10 are coupled to each other to drive a beard gear that is rotatable coaxially with the beard spring 11, and a fourth wheel & pinion 15 to which a pointer is engaged is driven via a fourth idler 12. Further, a viscous rotor intermediate wheel 18 is provided between the fourth wheel 15 and the viscous rotor 14 for braking to improve flexibility in layout. At this time, if the hands are attached to the beard pinion 11, the fourth idler 12, the viscous rotor idler 18, and the viscous rotor pinion 13, a small second hand type timepiece can be easily constructed.
Reference numeral 23 is a back wheel for driving the hour hand, 24 is a small iron wheel in which the hand wheel 37 meshes with the action of the thumb 31 and the bolt 30 by operating the winding stem 32, and enables correction of the hour and minute hands. . By operating the winding stem 32, 20 can be linked to 4
It is a restriction lever that comes into contact with the number wheel 15 and stops rotation. Numeral 25 drives the minute hand by slowing down the movement of the fourth wheel with which the second hand is engaged 3
A watch wheel, 33 is an IC having a clock circuit, 35 is a crystal oscillator, and the IC 33 and the crystal oscillator 35 are coil 1 through a circuit board 34.
Is supplied with a drive waveform for moving the rotor 5 of the stepping motor. 36 is a battery.

FIG. 3 is a plan view showing a state in which the hairspring 10 in FIG. 4 is not assembled to the beard gear and the outer end radius γ.
Is larger than the radius R of the assembled state of the wall portion 9d of the beard gear 9.

In such a configuration, since the hairspring 10 and the wall portion 9d always have a contact pressure, the bent portion 10a of the hairspring 10 and the groove portion 9c are not disengaged from each other due to vibration or impact. Also, the outer end radius γ of the balance spring 10 and the bent portion 10a
Although the length l of the above has considerably varied in processing and the engagement with the groove 9c may be dislocated on the inner diameter side, it can be surely engaged by setting γ> R. Furthermore, when one of the beard pinion 11 and the beard gear 9 stops rotating and the other is overloaded, and when the beard mainspring 10 is tightened, the vicinity of the bent portion 10a is elastically deformed and the engagement is temporarily disengaged. Will not be plastically deformed or destroyed.

FIG. 6 is another embodiment of the balance spring portion of the electronic timepiece according to the invention, and FIG. 5 is a plan view of the balance spring 10 shown in FIG. 6 before being assembled to the balance gear 9. The outer end radius γ of the outer end 10d of the balance spring is larger than the radius R when it is assembled to the beard gear, the outer end 10d is not bent, and the wall portion 9d of the beard gear 9 has a stepped portion. It composes 9h and regulates it by the degree of rotation.

In such a configuration, the beard gear 11 is braked and the beard gear 9
Is driven in the direction in which the balance spring 10 is unrolled, that is, in the direction of the arrow 100, the outer end 10d and the step portion 9h are engaged, and rotational energy is stored in the balance spring 10. Therefore, it is not necessary to form a bent portion at the outer end, the number of steps is reduced, and since the outer end 10d and the stepped portion 9h can be easily assembled, the assembling property is also improved.

[Effect of device]

As described above, according to the present invention, the outer end radius γ of the hairspring is set to be larger than that of the wall portion of the beard gear so as to always have a contact pressure, so that the engagement can be disengaged against vibration or impact. Not only does it not break even when overloaded, but it does not need to be caulked or welded, making it easy to assemble.

Therefore, the effect of the present invention is great, and its significance is great.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the electronic timepiece of the invention. FIG. 2 is a plan view showing a balance spring portion of a conventional electronic timepiece. FIG. 3 is a plan view showing an embodiment of the electronic watch of the present invention in a state before the mainspring is assembled into a bevel wheel. FIG. 4 is a plan view showing an embodiment of the balance spring portion of the electronic timepiece of the invention. FIG. 5 is a plan view showing another embodiment of the electronic watch of the present invention in a state before the mainspring is assembled into a bevel wheel. FIG. 6 is a plan view showing another embodiment of the balance spring portion of the electronic timepiece of the invention. 9 ... beard gear, 9c ... groove 9d ... wall, 9e ... regulator 9h ... step, 10 ... bearing spring 10a ... bending, 10d ... outer end 11 ... whisker

Claims (1)

[Scope of utility model registration request] 1. An electronic timepiece having a control means for accumulating intermittent rotational energy as elastic deformation of a balance spring 10 and smoothly releasing the rotational energy, and incorporating the same into a beard gear 9 in an electronic timepiece having a sweep hand movement. The hairspring 10
The electronic timepiece is characterized in that the outer end radius γ of is larger than the radius R in the state of being assembled to the beard gear 9.