JPH0542386Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a motor for watches, and in particular to a long and narrow motor used in table clocks and wall clocks, in which a gear train from a rotor to a time indicating wheel train is arranged in a line. This paper relates to improvements to the stator and iron core of a motor in a small-sized movement.

(Prior Art) A conventional small movement of this type with an elongated shape is disclosed in Japanese Patent Application Laid-Open No. 62-203087.

This movement uses a motor with a rotor placed opposite a U-shaped stator with a coil wound around one of the legs, and a gear train running from the rotor to the time indicating wheel train arranged in a line. It was hot.

By using this movement, you are no longer subject to design constraints due to the shape and thickness of the movement, increasing the degree of freedom in design, and it can also be incorporated into watch cases of various shapes and cases of various devices. This made it possible to increase its versatility.

(Problems to be Solved by the Invention) The width of the movement case in the above-mentioned conventional movement is determined by the width of the motor, which is the widest part of the internal mechanism.

In this motor, the stator was U-shaped, and the coil was wound around one of its legs, so the length of the motor was the sum of the length of the coil protruding from the stator width. It was wide.

Therefore, in this motor, the width of the movement case cannot be made narrower unless the width of the stator and the width of the coil are reduced to narrow the width of the motor.

However, changing the width of the stator and coil in this way poses a problem in that the performance of the motor deteriorates, so there is a limit to how narrow the width of the movement case can be made without degrading performance.

The purpose of this invention is to narrow the width of the motor without degrading its performance, thereby making the movement case even thinner, to further increase the degree of freedom in the design of watches, and to provide a watch motor with increased versatility. There is a particular thing.

(Means for Solving the Problems) A watch motor of the present invention has a coil winding part in which a coil is wound, and one end extends laterally to the same extent as the maximum thickness of the coil winding part. A bent iron core having a substantially L-shape, a sideward bending part provided at one end in the longitudinal direction, a first protrusion projecting from the end in the longitudinal direction, and the other part in the longitudinal direction. The stator includes a plate-shaped stator having a second protrusion provided at an end and facing the bent portion.

The iron core and the stator are integrated by attaching one end of the iron core to a first protrusion of the stator and further attaching the other end of the iron core to a second protrusion of the stator. is characterized in that the coil is housed within the lateral width of the stator.

(Function) The coil in the watch motor of the present invention is housed within the width of the stator.

In other words, in the past, the center of the coil was located on one of the parallel legs of the stator, causing the coil to protrude from the width of the stator, but the center of the coil of the present invention is located on one side of the stator's parallel legs by the bending of the iron core. The coil is shifted toward the main body, thereby keeping the coil within the width of the stator.

As a result, the width of the motor becomes exactly the same as the width of the stator, making it possible to make the width of the movement case even narrower.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a cross-sectional view showing the structure of a movement using a watch motor according to an embodiment of the present invention, and FIG. 2 is a central vertical cross-sectional view thereof.

2 is a motor, which includes an iron core 4 and a stator 6.

The main body 4a of the iron core 4 has an elongated plate shape, and one end 4b thereof is bent laterally to form a substantially L-shape.

Further, a coil 8 is wound around the main body 4a of the iron core 4 via a bobbin 10 to form a coil winding portion.

Like the iron core 4, the stator 6 has a main body 6a in the form of an elongated plate, and one end of the stator 6 is provided with a bent portion 6b that is bent laterally. is provided with a first protrusion 6c that protrudes in the longitudinal direction like the main body 6a.

Moreover, at the other end of the main body 6a of this stator 6,
A second protruding portion 6d is provided so as to protrude opposite the bent portion 6b.

Bent portion 6b of this stator 6 in this embodiment
protrudes laterally by a distance approximately equivalent to the diameter of the coil 8, and a circularly cut out stator pole 6e is provided at the center thereof.

A rotor 12 is disposed within the stator pole 6e, and the motor 2 is constituted by the aforementioned iron core 4, coil 8, stator 6, and rotor 12.

The motor with the above configuration is as shown in the figure.
It is arranged approximately in the center of a case 14 which is divided into two halves in an elongated shape, and in the left and right spaces in the figure, there is a drive circuit 16 for driving the motor 2, and a circuit from the rotor 12 to the clock indicating wheel train. A gear train 18 is housed therein.

This drive circuit 16 includes a crystal oscillator 20 and an IC 2 in which a frequency dividing circuit, a drive pulse generation circuit, etc. are integrated.
2, a trimmer capacitor 24 for adjustment, etc., and applies a 1 Hz driving pulse to the coil 8 of the motor 2.

The gear train 18 also includes a first reduction gear 26, a second reduction gear 28, which sequentially transmits the rotation of the rotor 12 to the pointer.
It consists of a third wheel 30, a seconds wheel 32, a minute wheel 34, a sun wheel 36, and an hour wheel 38, which are arranged on a line.

Note that the gear train 18 in this embodiment also includes a guide mechanism 40 and a guide wheel 42.

In the movement constructed as described above, the width of the case 14 is determined by the width of the motor 2, which is the widest part of the internal mechanism.

The iron core 4 of the motor 2 in this embodiment is bent to form a substantially L-shape.

Therefore, the bent one end 4b and the other end 4
c are respectively attached to the first protrusion 6c and second protrusion 6d of the stator 6, the distance between the iron core 4 and the main body 6a of the stator 6 is greater than the distance between the parallel legs of a conventional U-shaped stator. It gets narrower.

Therefore, the position of the coil 8 is the main body 6 of the stator 6.
It moves in the direction a, and is accommodated within the width of the stator 6.

Therefore, since a part of the coil 8 does not protrude to the side, the width of the motor 2 becomes narrower by this amount, and the case 14 can be made thinner.

(Effects of the invention) According to the invention described above, since the coil can be accommodated within the width of the stator, the conventional elongated movement case can be made even thinner, further increasing the degree of freedom in the design of watches. , further increasing versatility.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of a movement using a watch motor according to an embodiment of the present invention;
FIG. 2 is a central vertical sectional view of the movement shown in FIG. 1. 2...Motor, 4...Iron core, 4a...Main body, 4
b...One end, 4c...Other end, 6...Stator, 6a...Main body, 6b...Bending portion, 6c...First protrusion, 6d...Second protrusion, 6e... ...Stator pole, 8...Coil, 10...Bobbin, 12
...Rotor, 14...Case, 16...Drive circuit, 18...Gear train.

Claims (1)

[Scope of claim for utility model registration] An elongated timepiece movement in which a gear train from a rotor to a time indicating wheel train is arranged in a line, which has a coil winding part around which a coil is wound, one end of which is a part of the coil winding part. A substantially L-shaped iron core that is bent laterally to approximately the same extent as the maximum thickness of the winding portion, a bent portion provided at one end in the longitudinal direction that is bent laterally, and a bent portion of the bent portion. a plate-shaped stator having a first protrusion protruding from an end in the longitudinal direction and a second protrusion provided on the other side in the longitudinal direction and facing the bent part; By attaching one end of the core to the first protrusion of the stator and further attaching the other end of the iron core to the second protrusion of the stator,
A timepiece motor characterized in that the coil is housed within a lateral width of the stator.