JP2543305Y2 - Rotor support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to a support structure for a rotor of a step motor in a hand-held timepiece.

[Prior Art] In a hand type timepiece provided with a step motor, the driving force of the step motor is transmitted to each hand such as an hour hand and a minute hand via a wheel train mechanism, and each hand is operated to display the time. It has become.

The stepping motor in such a pointer type timepiece is a motor that rotates at a fixed angle by an electric pulse signal, and utilizes an attraction and repulsion force of an electromagnet including a coil and a stator and a magnet provided on a rotor. By
The rotor is rotated at a fixed angle.

Among them, the rotor, for example, along with the intermediate wheel and the fourth wheel,
It is rotatably supported and arranged between the main plate and the train wheel bridge arranged opposite to each other. The pinion of the rotor is meshed with the gear of the intermediate wheel, and the pinion of the intermediate wheel is meshed with the gear of the fourth wheel, whereby the rotation of the rotor is transmitted to the fourth wheel via the intermediate wheel. I have.

By the way, when a rotor or the like is incorporated between the main plate and the train wheel bridge in such a pointer type timepiece, first, the rotor, the intermediate wheel,
By placing each lower shaft part of the fourth wheel etc. in each bearing hole formed in the main plate, and then placing the train wheel bridge on the main plate with the rotor, intermediate wheel, fourth wheel etc. upright The upper shaft portions of the rotor, the intermediate wheel, the fourth wheel, etc. are supported by bearing holes formed in the train wheel bridge.

[Problems of the Related Art] However, in such a conventional supporting structure of the rotor in the pointer type timepiece, when the rotor, the intermediate wheel, the fourth wheel and the like are erected on the main plate during assembly, for example, the intermediate wheel is While the rotor and the fourth wheel are meshed with each other, the rotor is meshed only with the intermediate wheel, so that the rotor easily falls down. Therefore, the upper shaft of the rotor is inserted into the bearing hole of the train wheel bridge disposed on the main plate. There is a problem that it is difficult to support the part, and the assembling work is considerably troublesome. If the rotor is magnetized in advance, the rotor is magnetized after assembly because the rotor is attracted to the stator attached to the main plate and tilts. When disassembled, there is also a problem that reassembly becomes very difficult.

In the case of a synthetic resin base plate, it is necessary to provide a cylindrical protrusion on the base plate, fit the rotor housing hole of the stator outside this protrusion, and store the rotor inside the protrusion. Thus, it is conceivable to prevent the rotor from falling down.However, since a certain gap is required between the protrusion and the rotor, if the protrusion length of the protrusion is short,
It is not possible to sufficiently prevent the rotor from falling down.On the other hand, if the protruding portion has a long protruding length, the distance between the rotor housing hole of the stator and the rotor housed in the rotor housing hole is extremely narrow. There is a problem that the thickness has to be extremely thin, so that when the rotor is assembled, the protruding portion may be deformed or damaged.

[Purpose of the invention] This invention was made in view of the circumstances described above.
It is an object of the present invention to provide a rotor support structure that has a simple structure, can sufficiently prevent the rotor from falling down when the rotor is assembled, and can easily perform an assembling operation.

[Summary of the Invention] In order to achieve the above object, the present invention provides an intermediate support between a main plate and a train wheel support, and a rotor control for restricting the fall of the rotor when the rotor is assembled into the intermediate support. The key point is that a hole is provided, and an inclining ramp for inviting and raising the inclined rotor when the intermediate and wheel train receivers are assembled into the intermediate and wheel train receivers.

[Examples] Hereinafter, the present invention will be described in detail with reference to examples.

FIG. 1 shows a main part of a pointer type timepiece to which an embodiment of the present invention is applied.

In this pointer-type timepiece, a second bridge (intermediate bridge) 3 is provided between a main plate 1 and a train wheel bridge 2 provided opposite to each other. A cylindrical projection 4 is provided at a predetermined location on the upper surface of the base plate 1, and a bearing hole 5 is provided at the center of the projection 4. . A lever-shaped bearing portion 6 is provided at a predetermined position on the lower surface of the base plate 1, and a bearing hole 7 is provided inside the bearing portion 6. Bearing holes 8 are provided at three predetermined positions of the train wheel bridge 2.
~ 10 are provided. A rotor control hole 11 is provided at a predetermined position of the second catch 3, and a rotor entrance slope 12 is provided below the rotor control hole 11. Bearing holes 13 and 14 are provided at other predetermined two places of the second support 3.

A stator 21 of a step motor is provided on the upper surface of the main plate 1 with its rotor storage hole 22 fitted outside the protrusion 4 of the main plate 1. The rotor 23 of the step motor is
The structure includes, in order from the bottom, a lower shaft portion 24, a magnet 25 magnetized after or before assembly, a middle shaft portion 26, a kana 27, and an upper shaft portion 28. In the rotor 23, the magnet 25 is housed inside the protruding portion 4 of the main plate 1, the center shaft portion 26 is inserted into the rotor regulating hole 11 of the second catch 3, and the pinion 27 is connected between the train wheel bridge 2 and the second catch 3. The lower shaft portion 24 and the upper shaft portion 28 are supported by the bearing holes 5 and 8 of the base plate 1 and the train wheel bridge 2 while being positioned therebetween, so that the base plate 1 and the train wheel bridge 2 It is arranged rotatably supported between them.

The gear 32 of the intermediate wheel 31 is meshed with the pinion 27 of the rotor 23. The intermediate wheel 31 has a lower shaft 33 and a kana 34 in addition to the gear 32.
And an upper shaft portion 35. Intermediate wheel 31
The lower shaft part 33 and the upper shaft part 35 are the bearing holes of the second bearing 3 and the train wheel bearing 2.
By being pivotally supported by 13 and 9, it is rotatably supported and arranged between the second bridge 3 and the train wheel bridge 2. The pinion 34 of the intermediate wheel 31 is meshed with a gear 42 of a fourth wheel & pinion 41.
The fourth wheel & pinion 41 has a structure including a lower shaft 43, a pinion 44, and an upper shaft 45 in addition to the gear. The fourth wheel 41 is the lower shaft
43 is inserted through a through hole 56 of a second wheel & pinion 51 described later, and an upper shaft 45
Are rotatably supported and disposed between the second pinion 3 and the train wheel bridge 2 by being supported by the bearing hole 10 of the train wheel bridge 2. The lower shaft portion 45 of the fourth wheel & pinion 41 penetrates through the through hole 56 of the second wheel & pinion 51 and protrudes below the main plate 1. The second hand 47 is attached.

The gear wheel of the third wheel (not shown) is meshed with the pinion 44 of the fourth wheel 41. The third wheel has the main plate 1 and the train wheel bridge 2 in a state where the kana penetrates the second bridge 3 and is located below the second bridge 3.
And are rotatably supported and arranged between them. The gear 52 of the second wheel 51 is meshed with the pinion of the third wheel. Second car
Reference numeral 51 denotes a lower shaft 53, a pinion 54, and an upper shaft 55 in addition to the gear 52.
And a structure in which a through hole 56 is formed in the axial center portion. The center wheel & pinion 51 rotates between the main plate 1 and the second pinion 3 because the lower shaft portion 53 and the upper shaft portion 55 are pivotally supported by the bearing holes 7 and 14 of the main plate 1 and the second pinion 3. It is freely supported and arranged. The lower shaft 53 of the center wheel & pinion 51 is provided with the bearing hole 7 of the main plate 1.
, And project below the main plate 1, and a minute hand 57 is attached to the tip of the projected lower shaft portion 53.

The pinion 54 of the second wheel & pinion 51 is meshed with a minute wheel (not shown). When the minute wheel is in a state where its kana penetrates through the main plate 1 and is positioned below the main plate 1, the main plate 1
And are rotatably supported and arranged between them. The gear 62 of the hour wheel 61 is meshed with the pinion of the minute wheel. Hour wheel 61
Has a structure including a cylindrical shaft portion 63 in addition to the gear 62. The hour wheel 61 is rotatably supported by the bearing 6 of the main plate 1. The hour hand 64 is attached to the tip of the cylindrical shaft portion 63 of the hour wheel 61.

In this pointer-type timepiece, when the rotor 23 is rotated by the driving of the step motor, this rotation is transmitted to the fourth wheel & pinion 41 via the intermediate wheel 31, whereby the fourth wheel & pinion 41 rotates together with the second hand 47 in one minute. The rotation of the fourth wheel & pinion 41 is transmitted to the second wheel & pinion 51 via the third wheel and thereby the second wheel & pinion 51
Together with one hour in one hour, and the rotation of the second wheel & pinion 51 is transmitted to the hour wheel 61 via the minute wheel and thereby the hour wheel 61
One revolution in 12 hours with 64, and the time is thus displayed.

Next, a case where a part of the timepiece is assembled with the pointer type timepiece will be described with reference to FIGS.

First, as shown in FIG. 2, the rotor housing hole 22 of the stator 21 is fitted into the protruding portion 4 of the main plate 1, and the lower shaft portion 24 of the rotor 23 is pivotally supported in the bearing hole 5 of the main plate 1. The lower shaft portion 53 of the center wheel & pinion 51 is pivotally supported in the bearing hole 7. In this state, the second wheel 51
Is held upright by placing the gear 52 on the upper surface of the main plate 1. On the other hand, since the rotor 23 has only a small diameter lower shaft portion 24 supported by the bearing hole 5 of the main plate 1, the rotor 23 falls down by its own weight, and the magnet 25 comes into contact with the inner peripheral surface of the projecting portion 4 of the main plate 1. State.

Next, as shown in FIG. 3, the second pinion 3 is arranged on the main plate 1 and the upper shaft portion 55 of the second wheel & pinion 51 in the upright state is supported by the bearing hole 14 of the second pinion 3. At this time, the rotor 23 in the inclined state causes the kana 27 to abut on the rotor receiving slope 12 of the second receiver 3 and relatively rise along the slope 12,
It is erected, and the pinion 27 penetrates through the rotor control hole 11 of the second receiver 3 and protrudes above the second receiver 3, and the center shaft 26 is inserted into the rotor control hole 11 of the second receiver 3 and The hole 11 comes into contact with the hole wall surface. Accordingly, in this state, the rotor 23 is in a state in which the magnet 25 is separated from the inner peripheral surface of the protruding portion 4 of the main plate 1 and is more upright than the inclined state shown in FIG.

Next, as shown in FIG. 4, the lower shaft portion 43 of the fourth wheel & pinion 41 is inserted into the through hole 56 of the second wheel & pinion 51, and the lower shaft portion 33 of the intermediate wheel 31 is inserted into the bearing hole 13 of the second wheel & pinion 3. To support. In this state, the fourth wheel 41
Is held upright by inserting the relatively long lower shaft portion 43 into the through hole 56 of the center wheel & pinion 51 in the upright state. The intermediate wheel 31 is substantially in an upright state, as the gear 34 is meshed with the gear 42 of the fourth wheel & pinion 41 in the upright state, and the gear 32 is meshed with the gear 27 of the rotor 23 in a slightly inclined state. Is held.

Next, the train wheel bridge 2 is disposed on the second wheel bridge 3, and the upper shaft portion 45 of the fourth wheel & pinion 41 in the upright state is supported by the bearing hole 10 of the wheel train bridge 2, and is substantially upright. Upper shaft 35 of a certain intermediate wheel 31
In the bearing hole 9 of the train wheel bridge 2. At this time, as shown in FIG. 4, the rotor 23 in a slightly inclined state comes into contact with the intake slope 8a formed in the lower part of the bearing hole 8 of the train wheel bridge 2 by contacting the upper shaft 28 with the slope 8a. The upper shaft portion 28 is supported by the bearing hole 8 of the train wheel bridge 2 as shown in FIG.

As described above, the lower shaft portion of the rotor 23 is inserted into the bearing hole 5 of the base plate 1.
Even when the rotor 23 is inclined to some extent in a state where the rotor 24 is pivotally supported, the second slope 3 and the train wheel bridge 2 are actuated by the action of the attraction slopes 12 and 8a provided on the second bridge 3 and the train wheel bridge 2, respectively. , The rotor 23 can be erected by simply assembling each, so that the simple structure can sufficiently prevent the rotor 23 from falling down, assembling work can be easily performed, and repair and the like can be performed. Even if it is disassembled, reassembly can be easily performed.

Here, as shown in FIG.
The distance between the center shaft portion 26 of the bearing 23 and the wall surface of the rotor regulating hole 11 of the second bearing 3 is A, and the bearing slope 8a of the bearing hole 8 of the train wheel bearing 2 is defined as A.
Assuming that the horizontal interval (see FIG. 4) is B, B> A
It has become. As a result, the rotor 23 is initially in a somewhat inclined state as shown in FIG. 2, but when the second catch 3 is arranged on the main plate 1, it is raised to some extent as shown in FIG. The upper shaft portion 28 can be brought into contact with the intake slope 8a of the bearing hole 8 of the train wheel bridge 2. Further, as shown in FIG. 1, when the gap between the upper shaft portion 28 of the rotor 23 and the wall surface of the bearing hole 8 of the train wheel bridge 2 is C, C <A. Thus, the central shaft portion 26 of the rotor 23 does not come into contact with the hole wall surface of the rotor regulating hole 11 of the second receiver 3.

[Effects of the Invention] As described above, according to the invention, an intermediate support is provided between the main plate and the train wheel support, and the rotor control hole for restricting the rotor from falling when the rotor is assembled into the intermediate support. When installing the intermediate bearing and the train wheel bridge into the intermediate bearing and the train wheel bridge, a sloping ramp is provided to attract and raise the inclined rotor, so that the rotor can fall down with a simple structure. In addition to sufficient prevention, the assembling work can be easily performed, and even if disassembled for repair or the like, reassembly can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a main part of a pointer-type timepiece to which an embodiment of the present invention is applied, and FIGS. 2 to 4 each show an assembly of a part of the pointer-type timepiece. It is a longitudinal cross-sectional view shown for explaining. 1 ... base plate, 2 ... train wheel bridge, 3 ... second bridge (intermediate bridge),
11 ... Rotator restriction hole, 12 ... Rotator slope, 23 ...
... the rotor.

Claims (1)

(57) [Scope of request for utility model registration] 1. A base plate and a train wheel bearing provided opposite to each other and having a bearing hole, an intermediate bearing provided between the ground plate and the train wheel receiver and having a rotor regulating hole, and a lower shaft portion. A step motor rotor which is supported by a bearing hole of the base plate, a central shaft portion is inserted through the rotor regulating hole of the intermediate bearing, and an upper shaft portion is supported by the bearing hole of the train wheel bearing. In the supporting structure, a lower shaft portion is inserted into the lower portion of the rotor regulating hole of the intermediate support, and the lower shaft portion is brought into the rotor supported by the bearing hole of the main plate to raise the lower shaft portion while raising the lower shaft portion. The rotor receiving slope is provided to be inserted into the rotor restricting hole of the intermediate support, and a lower shaft portion is inserted into the rotor restricting hole of the intermediate support when the train receiving is assembled. The upper shaft of the rotor A bearing slope for pivotally supporting the upper shaft portion of the rotor in the bearing hole of the train wheel bearing. When the intermediate bearing is assembled, the central shaft portion contacts the wall surface of the rotor regulating hole of the intermediate bearing. The positional relationship between the upper shaft portion of the contacted rotor and the intake slope of the wheel train receiver to be assembled thereafter is such that the upper shaft portion of the rotor can abut on the intake slope of the wheel train receiver. A rotor support structure, characterized in that: