JP2001074857A - Hour-wheel presser foot structure for watch and hand seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an hour-wheel presser foot structure which prevents an hour hand from flapping in a watch equipped with a hour-wheel presser foot and to provide an hour-wheel friction spring which is used in an hour-wheel presser foot structure. SOLUTION: This structure refers to an hour-wheel presser foot structure, for a watch W, wherein an hour wheel 18 in which a gear part 18a engaged with a rear wheel for a day is formed is provided, between a mainplate 22 and an hour-wheel presser foot 24, at the base end of an hour part 18b in which an hour hand HH is connected to the tip. This hour-wheel friction spring 4A which urges the gear part 18a to the side of the mainplate 22 is arranged and installed between the hour wheel 18 and the hour-wheel presser foot 24 while it is in sliding contact with the gear part 18a. Thereby, it is possible to prevent the inclination of the hour wheel 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an hour wheel-holding structure of a pointer type timepiece provided with an hour wheel-holding timepiece and a needle seat used for the hour wheel-holding structure.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a pointer type timepiece, FIG. 9 is a schematic plan view showing a general wheel train structure, and FIG. 10 is a longitudinal section showing a general wheel train structure. FIG.
In the three-hand type electronic timepiece shown in FIGS. 9 and 10, the rotation of the rotor 11 is transmitted to the fourth wheel 13 via the fifth wheel 12. The second hand SH is connected to the end of the spindle of the fourth wheel & pinion 13,
The second hand SH moves with the rotation of the fourth wheel & pinion 13 (see FIG. 10).

[0003] A second wheel & pinion 16 is rotatably connected to the periphery of the support shaft of the fourth wheel & pinion 13, and rotation of the fourth wheel & pinion 13 is controlled by a second wheel & pinion 14 (see FIG. 9). The information is transmitted to the car 16. A minute hand MH is connected to the end of the spindle of the second wheel & pinion 16 having a cylindrical shape (see FIG. 10).
H is moving.

[0004] Around the support shaft of the center wheel & pinion 16, a center pipe 1 is provided.
The hour wheel 18 is rotatably connected via the switch 7. The rotation of the center wheel & pinion 16 is transmitted to the hour wheel 18 via the minute wheel 15 (see FIG. 9), and the hour hand HH moves as the hour wheel 18 rotates. A dial 23 is attached to the front side (the lower side in FIG. 10) of the hour wheel 18, and a flat hour wheel holder 24 is sandwiched between the dial 23 and the hour wheel 18.

In such a wheel train structure 1, each of the vehicles 12, 1
3 and the like are held at predetermined positions by the train wheel receiver 21 and the main plate 22.

[0006]

By the way, the hour wheel presser 24 sandwiched between the hour wheel 18 and the dial 23 has such an extent that the gap between the dial 23 and the hour wheel 18 is partially filled. Was something. For this reason, when the hour wheel 18 rotates, a slight inclination is inevitably generated. When the hour wheel 18 is inclined, the hour hand HH is also inclined, and there is a possibility that the hour hand HH may interfere with the minute hand MH and the second hand SH. Therefore, in the related art, the interval between the hour hand HH and the other hands SH and MH is increased to prevent interference, and the watch becomes thicker accordingly. In addition, as one means for preventing such a problem, it is conceivable to arrange and form an hour wheel inclining prevention member on the dial 23.

[0007] However, such means have been unsatisfactory for the following reasons. In other words, in the business world of selling watches, etc., the incomplete watch before attaching the dial 23 is traded as a product, and the manufacturer who purchased this product attaches its own dial 23 to make it a finished product. But this is commonly done. Usually, such manufacturing is referred to as OEM (manufactured by a partner brand). That is, in the case of a manufacturing mode such as an OEM, the same problem as in the previous stage occurred.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a timepiece having an hour wheel holding mechanism, in which the hour hand is lifted. It is an object of the present invention to provide a structure and a needle seat used for an hour wheel holding structure.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a method in which a proximal end of a cylindrical portion to which an hour hand is connected at a distal end is provided.
An hour wheel having a gear portion that meshes with the minute wheel, a hour wheel holding structure for a timepiece provided between a main plate and an hour wheel presser, and between the hour wheel and the hour wheel presser, A needle seat is provided which urges the gear portion toward the base plate side while slidingly contacting the gear portion, thereby preventing the hour wheel from tilting.

Further, the needle seat may be a separate body independent of the hour wheel retainer. Further, the needle seat as a separate body may be an elastic member which is formed by bending both ends in the diameter direction of a ring-shaped thin plate having a hole through which a cylindrical portion is bent toward the center, or an elastic member which is bent in multiple stages. It can also be.

On the other hand, instead of arranging the needle seat, a needle seat portion for slidingly contacting the gear portion to prevent inclination of the hour wheel around a hole portion of the cylindrical portion presser through which the cylindrical portion penetrates. An hour wheel holding structure characterized by the formation of Further, the needle seat portion may be an elastic member, and the gear portion may be urged toward the base plate while slidingly contacting the gear portion.

Further, the needle seat portion includes a ring body having a hole through which the cylindrical portion penetrates, and a connecting portion for connecting the ring body in a state of being separated from the hour wheel retainer toward the gear portion side. It can also be characterized by becoming.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
This will be specifically described with reference to the drawings as appropriate. FIG. 1 is a schematic plan view showing a train wheel structure, and FIG. 2 is a vertical cross-sectional view taken along line XX of FIG. 1, showing an hour wheel holding structure according to the first embodiment. First, the pointer-type timepiece W will be outlined with reference to FIGS. In the following description, members and the like that are the same as those in the related art are denoted by the same reference numerals, and description thereof is partially omitted.

As shown in FIG. 1, a quartz oscillator 31, an IC 32, a circuit block 37, a coil block 3
3, stator 34, battery 35, regulating lever 36, wheel train 1
And so on. The rotation of the rotor 11 supported by the stator 34 is transmitted to the fifth wheel & pinion 12 first. Then, the rotation of the fifth wheel & pinion 12 is transmitted to the fourth wheel & pinion 13. As shown in FIG. 2, the second hand SH is connected to the end of the spindle of the fourth wheel 13, and the second hand SH moves as the fourth wheel 13 rotates.

The rotation of the fourth wheel & pinion 13 (see FIG. 1) is transmitted to the second wheel & pinion 16 via the third wheel 14. The minute hand MH is connected to the tip of the spindle of the second wheel & pinion 16, and the minute hand MH moves as the second wheel & pinion 13 rotates. The rotation of the center wheel & pinion 16 is transmitted to the hour wheel 18 via the minute wheel 15 (see FIG. 1). The hour hand HH is connected to the tip of the cylindrical portion 18b of the hour wheel 18, and the hour hand HH moves as the hour wheel 18 rotates.

Next, the structure of the hour wheel 18 and the hour wheel holding structure according to the first embodiment will be described in detail.

As shown in FIG. 2, the hour wheel 18 comprises a gear portion 18a and a cylindrical portion 18b. The gear portion 18a is formed around the base end of the cylindrical portion 18b (around the upper end in FIG. 2), and is provided in the recess 22a of the base plate 22. This gear part 18a
It engages with the minute wheel 15 (see FIG. 1). On the other hand, the cylindrical portion 18
b protrudes from the center of the gear portion 18a toward the front side (the lower side in FIG. 2) of the pointer-type timepiece W, and
4a and through the cylindrical hole 23a of the dial 23. The hour hand HH is connected to the tip of the cylindrical portion 18b.

The hour wheel holder 24 pressed by the attachment of the dial 23 contacts the lower surface of the gear portion 18a. That is, the operation of the hour wheel presser 24 causes the hour wheel 18
Is held to some extent. However, with the flat hour wheel holder 24 alone, between the hour wheel 18 and the hour wheel holder 24,
A gap is inevitably generated, and the hour wheel 18 may be inclined.

Therefore, the needle seat 4A is mounted around the cylindrical portion 18b, and the needle seat 4A is attached to the hour wheel holder 24 and the dial 23.
Press down with. The needle seat 4A is an elastic member, and repels the pressing of the hour wheel presser 24 to move the gear portion 18a to the base plate 22.
Bias to the side. By this bias, the gear portion 18a is stably held, and the inclination of the hour wheel 18 is prevented. The needle seat 4A only pushes up while contacting the gear portion 18a. Therefore, the gear portion 18a can freely rotate while sliding on the needle seat 4A.

FIG. 3 is a view taken in the direction of the arrow Y in FIG. 2 and shows a state before the hour wheel holder 24 is attached. By the way,
In FIG. 3, the hour wheel holder 24 is indicated by a virtual line. FIGS. 4A and 4B are a perspective view and a plan view of the needle seat. FIG. 4A shows the needle seat used in the hour wheel holding structure according to the first embodiment, and FIG. 9 shows a needle seat used in the hour wheel holding structure according to the embodiment.

The needle seat 4A (hereinafter referred to as first needle seat 4A) used in the hour wheel holding structure according to the first embodiment is a ring-shaped thin plate as shown in FIG. , The cylindrical portion 18b of the hour wheel 18 penetrates. The first
The needle seat 4A is made of metal such as stainless steel or copper,
As shown in FIG. 4A, both ends in the diametrical direction are bent in a curve toward the center, and the bending gives an elastic force.

On the other hand, a needle seat 4B (hereinafter referred to as a second needle seat 4B) used in the hour wheel holding structure according to the second embodiment.
) Is basically a ring-shaped thin plate common to the first needle seat 4A (see FIG. 4B). However, in the second needle seat 4B, both ends in the diameter direction are bent in multiple steps,
An elastic force is provided by this bending.

The first needle seat 4A and the second needle seat 4B are both separate from the hour wheel holder 24, and each of the needle seats 4A, 4A
Each B can be replaced. Therefore, when the needle seats 4A, 4B are damaged due to wear or the like, and the swing of the hour wheel 18 becomes large, the needle seats 4A, 4B can be replaced with new ones as appropriate.

The needle seat according to the present invention is not limited to the needle seats 4A and 4B according to the above embodiments. In other words, the gear portion 18a is disposed between the hour wheel 18 and the hour wheel presser 24 and slidably comes into contact with the gear portion 18a. When the dial 23 is attached, an elastic force acts to urge the gear portion 18a toward the main plate 22. Anything that can prevent the inclination of the hour wheel 18 is sufficient.
However, if the ring-shaped thin plate is bent to have elastic force as in the case of each of the needle seats 4A and 4B, the manufacture is relatively easy. Further, if the structure is such that the cylindrical portion 18b is provided so as to penetrate the hole portion 41, the needle seats 4A and 4B are unlikely to be shifted with respect to the hour wheel 18.

Next, an hour wheel holding structure according to another embodiment will be described. FIG. 5 is a longitudinal sectional view of a portion indicated by XX in FIG. 1 and shows an hour wheel holding structure according to the third embodiment. FIG. 6 is a view in the direction of the arrow Z in FIG. The hour wheel holding structure according to the present embodiment is different from the hour wheel holding structures according to the first and second embodiments.
The needle seat and the hour wheel retainer are integrally formed. That is, FIG.
, The hour wheel presser 2 in contact with the gear portion 18a of the hour wheel 18
5, a needle seat 26A is formed, and the operation of the needle seat 26A prevents the hour wheel 18 from tilting. Hereinafter, the needle seat 26
The hour wheel holder 25 provided with A will be described in detail.

As shown in FIG. 5 and FIG.
A circular hole 25a through which the cylindrical portion 18b of the hour wheel 18 penetrates is formed. Around this hole 25a, a gear 18a
A needle seat 26A is formed to slide against and prevent the hour wheel 18 from tilting.

FIGS. 7 and 8 are schematic perspective views showing the specific shape of the needle seat portion. FIG. 7 (a) shows the needle seat in the hour wheel holding structure according to the third embodiment. Part,
FIG. 13B shows the needle seat portion in the hour wheel holding structure according to the fourth embodiment, and FIG. 13C shows the needle seat portion in the hour wheel holding structure according to the fifth embodiment. Show. Further, FIG. 8A shows a needle seat portion in the hour wheel holding structure according to the sixth embodiment, and FIG. 8B shows a needle seat in the hour wheel holding structure according to the seventh embodiment. FIG. 14C shows a needle seat portion in the hour wheel holding structure according to the eighth embodiment.

The needle seat 26A in the hour wheel holding structure according to the third embodiment has a hole 25a as shown in FIG.
The curved long groove 27a conforming to the shape of is formed. One end 27c of the curved plate 27b formed by cutting out the curved long groove 27a remains connected to the curved long groove 27a. Then, based on the one end 27c, the other end 27d of the curved plate 27b is bent upward. The hour wheel holder 25 having the needle seat portion 26A is made of metal or the like, and an elastic force is applied by bending the curved plate 27b. That is, the needle seat 26 according to the present embodiment
A corresponds to an elastic member.

The other end 27d of the curved plate 27b to which the elastic force is applied comes into sliding contact with the gear portion 18a to prevent the hour wheel 18 from tilting. Note that the curved plate 27b in the present embodiment is formed at three places along the circumference of the hole 25a in a well-balanced manner. Therefore, the gear portion 18a also has
The biasing force works in a well-balanced manner, and effectively prevents the inclination of the hour wheel 18. In addition, the curved plate 2 in the present embodiment
The direction from one end 27c to the other end 27d of 7b corresponds to the rotation direction of the hour wheel 18. Therefore, it is difficult to hinder rotation of the hour wheel 18.

FIG. 7B shows a needle seat 26B in the hour wheel holding structure according to the fourth embodiment. In the needle seat 26B according to the present embodiment, a round groove 27e is formed around the hole 25a. In the cutout of the round groove 27e, the hole 25a side is partially connected.
Then, this part is set as the base 27g, and the cut-out disk is machined into a triangular shape to make the vertex 27h into the hole 25a.
Are formed in the radial direction of the triangular plate 27.
f. The apex 27h of the triangular plate 27f is bent upward to apply elastic force similarly to the needle seat 26A according to the third embodiment, and the needle seat 26B according to the present embodiment also has an elastic member. Equivalent to.

The triangular plate 2 according to the present embodiment
7f is also formed in three places around the hole 25a in a well-balanced manner. Therefore, the biasing force acts on the gear portion 18a in a well-balanced manner, and effectively prevents the hour wheel 18 from tilting. The needle seat 26B is a straight spring that urges along a straight line extending radially from the center of the hole 25a. Therefore, the same condition is applied to forward and reverse rotation.

FIG. 7C shows a needle seat 26C in an hour wheel holding structure according to a fifth embodiment. In the needle seat 26C according to the present embodiment, an arch-shaped leaf spring 27i corresponding to an elastic member is formed around the hole 25a. The leaf spring 27i is formed by piercing two straight lines parallel to the hour wheel holder 25, and bending a portion sandwiched between the straight lines upward to bend into an arch shape. The leaf spring 27i according to the present embodiment is also formed in three places around the hole 25a with good balance.

Further, according to the needle seat portion 26C according to the present embodiment, it is sufficient to process only the minimum space required for forming the leaf spring 27i in the hour wheel holder 25. Therefore, on the plane space of the hour wheel holder 25,
It is advantageous.

FIG. 8A shows a needle seat 26D in the hour wheel holding structure according to the sixth embodiment. In the needle seat portion 26D according to the present embodiment, a ring body 27j is formed by cutting out a circle around the hole 25a. At both ends in the diameter direction of the ring body 27j, linear connecting portions 27k, 27k bent downward are formed.
The ring body 27j is connected to the hour wheel holder 25 by the connecting portions 27k. That is, the ring body 27j is
The ring body 27j is separated from the hour wheel holder 25.
Is arranged toward the gear portion 18a to function as the needle seat portion 26D.

The needle seat 26D according to the present embodiment
Since the ring body 27j slides on the entire circumference of the gear portion 18a, the stability accompanying rotation of the hour wheel 18 increases.

FIG. 8B shows a needle seat 26E used in the hour wheel holding structure according to the eighth embodiment. The needle seat portion 26E according to the present embodiment also forms a ring body 27j as in the seventh embodiment. However, in the present embodiment, connecting portions 27m, 27m for connecting the ring body 27j and the hour wheel presser 25 while drawing a curve, instead of the linear connecting portions 27k, 27k, are provided at both ends in the diameter direction of the ring body 27j. Form. This connecting part 27m,
Since 27m is curved, it exhibits an elastic action. That is, the needle seat 26E according to the present embodiment corresponds to an elastic member.

The needle seat 26E according to the present embodiment is provided.
Also, since the ring body 27j is urged while sliding on the entire circumference of the gear portion 18a, the stability accompanying rotation of the hour wheel 18 is increased.

FIG. 8C shows a needle seat 26F used in the hour wheel holding structure according to the eighth embodiment. In the needle seat 26F according to the present embodiment, the hole 25
A punch holding portion 27n protruding in a ball shape around a
To form In the present embodiment, punch holding portions 27n are formed in four places around the hole 25a with good balance.

In the needle seat 26F according to the present embodiment, no elastic action can be expected. However, according to the present embodiment, only one point of each punch holding portion 27n is
Since it comes into contact with a, the load applied to the hour wheel 18 can be reduced.

As described above, in the holding structure of the hour wheel according to each embodiment, the needle seat 4A and the like independent of the hour wheel holder 24,
The needle seat 25A formed integrally with the hour wheel holder 24 prevents the hour wheel 18 from tilting. In other words, it is basically independent of the dial 23, and can be adapted to the case of manufacturing in OEM.

The present invention is not limited to the above embodiments. That is, for example, the shape of the needle seat is not limited to only a circle, and a leaf spring or the like may be provided as an elastic member. Further, the material of the needle seat and the hour wheel holding member is not limited to stainless steel or copper material. The sliding contact with the gear portion of the hour wheel while being urged, or only the sliding contact with the gear portion, prevents inclination of the hour wheel. Whatever you can do is enough.

[0042]

According to the first aspect of the present invention, the needle seat is
Since the gear portion is urged toward the main plate while slidingly contacting the gear portion, the inclination of the hour wheel can be effectively prevented. Claim 2
According to the invention, the needle seat is separate from the hour wheel holder, so that the needle seat can be easily replaced and repaired.

According to the third and fourth aspects of the present invention, since the cylindrical portion has the through hole, the needle seat is less likely to be displaced with respect to the hour wheel. The seat can be manufactured relatively easily.

Further, according to the fifth aspect of the present invention, the needle seat portion slides on the gear portion, thereby effectively preventing the hour wheel from tilting. Further, in the present invention, since the needle seat portion is formed in the hour wheel holder, the number of parts can be reduced. According to the invention of claim 6, since the needle seat portion is an elastic member, the needle seat portion comes into sliding contact with the gear portion and urges the gear portion toward the base plate. Therefore, the effect of preventing the slant of the hour wheel is improved.

According to the seventh aspect of the present invention, since the ring body is in slidable contact with the entire circumference of the gear portion, the stability of the rotation of the gear portion is improved.

As described above, in the invention according to each claim, the inclination of the hour wheel is prevented by the needle seat independent of the hour wheel presser or the needle seat portion formed in the hour wheel presser. It does not form a seat or the like. Therefore, the present invention can be applied to the case of manufacturing in the form of OEM.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a wheel train structure.

FIG. 2 is a vertical sectional view taken along line XX of FIG. 1, showing an hour wheel holding structure according to the first embodiment.

3 is a view taken in the direction of the arrow Y in FIG. 2 and shows a state before an hour wheel holder 24 is attached.

4A and 4B are a perspective view and a plan view of a needle seat, and FIG.
The needle seat used in the hour wheel holding structure according to the first embodiment is shown, and (b) shows the needle seat used in the hour wheel holding structure according to the second embodiment.

FIG. 5 is a longitudinal sectional view of a portion indicated by XX in FIG. 1, showing an hour wheel holding structure according to a third embodiment.

FIG. 6 is a view in the direction of the arrow Z in FIG. 5;

FIGS. 7A and 7B are schematic perspective views showing a specific shape of a needle seat, wherein FIG. 7A shows a needle seat in an hour wheel holding structure according to a third embodiment, and FIG. The needle seat in the hour wheel holding structure according to the fourth embodiment is shown, and FIG.
14 shows a needle seat in an hour wheel holding structure according to a fifth embodiment.

FIGS. 8A and 8B are schematic perspective views showing a specific shape of a needle seat, wherein FIG. 8A shows a needle seat in an hour wheel holding structure according to a sixth embodiment, and FIG. 7C shows a needle seat portion in an hour wheel holding structure according to the seventh embodiment, and FIG.
16 shows a needle seat in an hour wheel holding structure according to an eighth embodiment.

FIG. 9 is a schematic plan view showing a general wheel train structure.

FIG. 10 is a longitudinal sectional view showing a general wheel train structure.

[Explanation of symbols]

4A, 4B: needle seat 15: minute wheel 18: hour wheel 18b: cylindrical portion 18a: gear portion 22: base plate 24, 25: hour wheel retainer 24a, 25a: hole 26A, 26B, 26C, 26D, 26E, 26F: Needle seat 27k, 27m: Connecting part W: Pointer-type watch HH: Hour hand

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Nakajima 1-8 Nakase, Mihama-ku, Chiba-shi, Chiba F-term in Seiko Instruments Inc. 2F001 AA00 AG03 AG05 AG07

Claims (7)

[Claims] 1. A base end of a cylindrical portion to which an hour hand is connected at a distal end,
An hour wheel having a gear portion that meshes with a minute wheel, a hour wheel holding structure for a clock provided between a main plate and an hour wheel presser, wherein the hour wheel and the hour wheel presser are provided between the hour wheel and the hour wheel presser. A clock wheel holding structure for a timepiece, wherein a needle seat that urges the gear portion toward the base plate while slidingly contacting the gear portion is disposed to prevent the hour wheel from tilting. 2. The hour wheel holding structure for a timepiece according to claim 1, wherein the needle seat is provided separately from the hour wheel holder. 3. A needle seat used in the hour wheel holding structure according to claim 2, wherein both ends in a diameter direction of a ring-shaped thin plate having a hole portion through which the cylindrical portion passes are curved toward a center direction. A needle seat comprising a bent elastic member. 4. A needle seat used in the hour wheel holding structure according to claim 2, wherein both ends in a diameter direction of a ring-shaped thin plate having a hole portion through which the cylindrical portion passes are formed in multiple stages toward a center direction. A needle seat characterized in that the needle seat is an elastic member bent in a bent shape. 5. A proximal end of a cylindrical portion to which an hour hand is connected at a distal end,
An hour wheel having a gear wheel that meshes with a minute wheel, a hour wheel and pinion holding structure of a timepiece provided between a main plate and an hour wheel retainer, wherein the cylindrical portion has a hole formed therein. A hour wheel holding structure for a timepiece, wherein a needle seat portion is formed around the wheel portion so as to slidably contact the gear portion to prevent the hour wheel from tilting. 6. The hour wheel support for a timepiece according to claim 5, wherein said needle seat portion is made of an elastic member, and said gear portion is urged toward said main plate while slidingly contacting said gear portion. Construction. 7. The needle seat comprises a ring body having a hole through which the cylindrical part penetrates, and a connecting part for connecting the ring body in a state of being separated from the hour wheel retainer toward the gear part side. The hour wheel holding structure for a timepiece according to claim 5, wherein: