JP2962320B2 - clock - Google Patents

clock

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Publication number
JP2962320B2
JP2962320B2 JP20840198A JP20840198A JP2962320B2 JP 2962320 B2 JP2962320 B2 JP 2962320B2 JP 20840198 A JP20840198 A JP 20840198A JP 20840198 A JP20840198 A JP 20840198A JP 2962320 B2 JP2962320 B2 JP 2962320B2
Authority
JP
Japan
Prior art keywords
plastic
rotor
hole
tenon
plastic rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP20840198A
Other languages
Japanese (ja)
Other versions
JPH1194956A (en
Inventor
今夫 平賀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP20840198A priority Critical patent/JP2962320B2/en
Publication of JPH1194956A publication Critical patent/JPH1194956A/en
Application granted granted Critical
Publication of JP2962320B2 publication Critical patent/JP2962320B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は低コストのアナログ
式時計における輪列案内構造に関するものである。 【0002】 【0003】 【従来の技術】従来、アナログ式時計は、地板、受類及
び極小部品である輪列構成部材は、金属材で作られるの
が一般的であり、一部回路部品、電子回路の絶縁用等に
プラスチック材が用いられているのみであった。しか
し、部品加工の工数ダウンを図り、低コスト化の成され
た時計体の提供は市場の大きな要請であり、プラスチッ
ク化された、地板、受、輪列等による時計体の提供は、
従来の金属材料構成に比較して1/2程度のコストダウン
が達成でき、その実用化は急務であった。 【0004】かかる従来の構成例を図2に示す。 【0005】図2について説明すると、1はプラスチッ
ク材により形成された地板、2は磁石3をインサート形
成したプラスチックロータである。4はプラスチック材
により構成された五番車で歯車4−a及びカナ4−bよ
り成る。5は五番カナと噛合する四番歯車、6は三番カ
ナ(図示せず)と噛合する二番歯車を示す。7はステー
タ、9は筒車を示す。いずれも公知の働きを行うため詳
細な説明は省く。8はプラスチック材により形成された
輪列受である。図よりも明らかな通り、ロータ及び五番
車の下ほぞ2−a,4−cは各々地板穴1−a,1−bに上ほ
ぞ2−b,4−dは輪列受穴8−a,8−bに遊合され案内
位置決めされる。輪列受は該車案内組込時、車位置ズ
レ、車番倒れ等に対応する斜面部8−c,8−dを有し、
組み込み性をよくする。 【0006】しかし、本従来例においては、プラスチッ
ク加工特性上、以下の重大な弊害をもつ。即ち各番車は
地板及び輪列受に設けたほぞ穴により案内されるが、該
穴端部には、プラスチックによるバリ、カエリ等が発生
する危険が極めて高い。 【0007】該穴部プラスチック成形における成形型構
造を図3に示し説明する。一般的にはほぞ穴部について
は図3によるA型とB型により型締めされ、形成される
が該ほぞ穴部は、A型面に必要なほぞ径d部をもったB
型を突き当て、すき間のない状態にして形成する。しか
し、B型に設けたピン先端B−1部は常に平坦度を必要
とし、ダレ及び型摩耗等、又、A型,B型型締め部とピン
先端寸法ズレ等によりすき間が生じ、プラスチックが部
分的に充填し、平面バリ8−gが発生する。該バリ等は
輪列部ガタをなくし、時計の止まり等重大欠陥を招く危
険が高かった。又、輪列アガキは図2に示すように、地
板側は1−c面で、輪列受け側は8−e,8−f面で決ま
るため、接触面積が大きく、かつ、車中心に対して外周
側に位置するため、摩擦等によるトルク損失が大きく腕
時計のように保有トルクの小さい輪列構造としては品質
的にも問題があった。加えて、プラスチックロータの軸
部の一端部にバリがあり、この部分が地板又は輪列受け
の凹部溝に入り込むと、その凹部溝内で前記バリが逃げ
場を失うこと等により時計の止まりや狂い等の欠陥を招
く危険性が生じた。 【0008】 【発明が解決しようとする課題】本発明はかかる従来の
構造の問題点を解決し、プラスチックからなるロータや
受部材を使用しながら、時計の止まり、狂い等の欠陥を
招くことがなく、且つ摩擦トルクの少ない輪列案内構造
を提供することを目的とする。 【0009】 【課題を解決するための手段】本発明の時計は、磁石を
保持したプラスチックロータと、前記プラスチックロー
タの一方のほぞを軸支するプラスチック材からなる地板
と、前記プラスチックロータの他方のほぞを軸支するプ
ラスチック材からなる受部材と、前記磁石と平面方向に
対向配置されるステータとを有する時計において、前記
地板と受部材のいずれか一方の軸受部には凹部溝、他方
の軸受部には貫通穴が形成されてなり、前記凹部溝に軸
支される前記プラスチックロータのほぞ先端の端面は前
記凹部溝の底部により軸方向に位置決めされ、前記貫通
穴に軸支されるほぞは先端の端面にバリによる凸状部が
形成されているとともに通常は前記貫通穴から外方に突
出することがなく前記貫通穴内で支持されており、前記
貫通穴の内方の周囲には、前記プラスチックロータが衝
撃等で軸方向に移動した場合に前記プラスチックロータ
を支持する支持部が形成されていることを特徴とする。 【0010】 【発明の実施の形態】以下図1により説明する。 【0011】図1について説明すると、11はプラスチッ
ク材により形成された地板、12は磁石13をインサート形
成したプラスチックロータである。14はプラスチック材
により構成された五番車で歯車14−a及びカナ14−bよ
り成る。15は五番カナと噛合する四番歯車、16は三番カ
ナ(図示せず)と噛合する二番歯車を示す。17はステー
タ、19は筒車を示す。いずれも公知の働きを行うため詳
細な説明は省く。18はプラスチック材により形成された
輪列受である。図よりも明らかな通り、ロータ及び五番
車の下ほぞ12−a,14−cは各々地板穴11−a,11−b
に、上ほぞ12−b,14−dは輪列受穴18−a,18−bに遊
合され案内位置決めされる。輪列受は該車案内組込時、
車位置ズレ、番車倒れ等に対応する斜面部18−c,18−
dを有し、組み込み性をよくする。また輪列受18の輪列
受穴18−a,18−bは凹部溝からなり、輪列アガキを決
めるためのほぞ先端側の凹部溝の底部20の肉厚Tはプラ
スチック充填の必要上0.2〜0,25mm程度必要である。 【0012】かかる構成によれば輪列受の受穴周辺にバ
リが発生することがなく、またローター及び歯車のほぞ
先端の端面が前記凹部溝18―a、18―bの底部に当
接して軸方向に位置決めされるので摩擦面積が少なくな
り、プラスチック地板と受板を用いても摩擦トルク損失
を著しく少なくすることができるものである。ローター
の下ほぞは通常地板の貫通穴からなる受穴11−aから突
出することなく、受穴11−a内に軸支されている。こ
れはローターほぞ先端の端面には図1の如くバリによる
凸状部12−cがありこの部分が地板と接触するのを避け
るためである。11−cはローターが衝撃等で大きく軸方
向に移動したときの支持部であって、受穴11―aの内
方の周囲に形成されている。前記ロータの通常時には、
その磁石13とその平面方向に対向配置されたステータ
17との磁気作用により図1のようにロータが宙に浮い
た状態となっている。ロータが衝撃等で大きく軸方向に
移動しても、前記支持部11−cに衝突するが、その反
力で図1の通常状態に復元する。 【0013】 【発明の効果】以上の如く、本発明によれば、一方の軸
受部材の軸受部を貫通穴としたので、磁石を保持したプ
ラスチックロータのほぞ先端の端面にバリによる凸状部
が形成されているにもかかわらず貫通穴が逃げ場となる
ことにより、ほぞ先端端面が凹部溝に軸支される場合の
ように前記凸状部が凹部溝の底部と接触することによる
摩擦抵抗の増大と不安定さとをもたらすことがない。ま
た、プラスチックロータの通常状態においては、プラス
チックロータのほぞ先端が貫通穴から突出せずに貫通穴
内で軸支されるので、貫通穴の外端部に生じやすいバリ
と接触することがなく、バリづまりによるプラスチック
ロータの回転不良を回避できる。一方、プラスチックロ
ータの他方のほぞが軸支される軸受部は、凹部溝になっ
ているのでプラスチック成型時にバリの発生がなく、従
ってプラスチックロータの回転不良の心配がない。加え
て、軸方向の位置決めをなすための凹部溝と接触する箇
所はプラスチックロータのほぞ先端の端面であるので、
接触面積が少なくなるとともに平滑に形成されやすいこ
とにより、摩擦抵抗がより低減されるものである。 【0014】また、プラスチックロータのほぞ先端が基
本的には地板及び輪列受の軸受部材より突出することな
くその軸受部内に支持されることから、例えば注油針が
や工具等が、ほぞ先端に衝突してほぞを変形させたり新
たなバリを発生させたりして、プラスチックロータの回
転不良を引き起こしてしまう危険性を回避するという効
果を有する。
Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a train guide structure for a low-cost analog timepiece. 2. Description of the Related Art Conventionally, in an analog type timepiece, a base plate, a receiver, and a train wheel constituting member, which are extremely small parts, are generally made of a metal material. Only plastic materials have been used for insulation of electronic circuits. However, providing a timepiece with reduced cost by reducing man-hours in parts processing is a great demand of the market, and the provision of a timepiece made of plastic, a base plate, a receiver, a wheel train, etc.
Cost reduction of about 1/2 compared with the conventional metal material configuration was achieved, and its practical use was urgently needed. FIG. 2 shows an example of such a conventional configuration. Referring to FIG. 2, 1 is a base plate formed of a plastic material, and 2 is a plastic rotor having a magnet 3 formed by insert. Reference numeral 4 denotes a fifth wheel made of a plastic material, which comprises a gear 4-a and a pinion 4-b. Reference numeral 5 denotes a fourth gear that meshes with a fifth pinion, and 6 denotes a second gear that meshes with a third pinion (not shown). Reference numeral 7 denotes a stator, and 9 denotes an hour wheel. Since each of them performs a known function, a detailed description is omitted. Reference numeral 8 denotes a train wheel bridge formed of a plastic material. As is clear from the figure, the lower tenon 2-a and 4-c of the rotor and the fifth wheel are located on the main plate holes 1-a and 1-b, respectively, and the upper tenon 2-b and 4-d are located on the wheel train receiving hole 8-. a, 8-b and guide positioning. The train wheel bridge has slope portions 8-c, 8-d corresponding to the vehicle position deviation, vehicle number fall, etc. when the vehicle guide is incorporated,
Improve incorporation. However, this conventional example has the following serious disadvantages in terms of plastic processing characteristics. That is, each wheel is guided by a mortise provided in the main plate and the train wheel bridge, and there is a very high risk that plastic burrs, burrs, etc. will occur at the ends of the holes. FIG. 3 shows the structure of a molding die in the plastic molding of the hole. Generally, the mortise is clamped and formed by the A-type and B-type shown in FIG. 3, but the mortise has a mortise diameter d required for the A-type surface.
The mold is abutted to form no gap. However, the pin tip B-1 portion provided on the B type always requires flatness, and a gap is generated due to sagging and abrasion, etc., and a gap between the A type and B type clamping parts and the pin tip size deviation, and plastic is generated. Partially filled, planar burrs 8-g occur. The burrs and the like eliminated rattling of the wheel train, and there was a high risk of causing serious defects such as stoppage of the timepiece. As shown in FIG. 2, the wheel train agaki is determined by the 1-c plane on the base plate side and the 8-e and 8-f planes on the wheel train receiving side, so that the contact area is large and the Therefore, there is a problem in terms of quality as a wheel train structure having a small holding torque like a wristwatch, because torque loss due to friction and the like is large because the wheel train is located on the outer peripheral side. In addition, there is a burr at one end of the shaft portion of the plastic rotor, and when this portion enters a concave groove of the main plate or the train wheel train, the burr loses a place to escape in the concave groove, and the clock stops or goes out of order. There is a risk of causing defects such as SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional structure, and causes defects such as stoppage and deviation of a timepiece while using a plastic rotor and a receiving member. It is an object of the present invention to provide a gear train guide structure that has no friction torque. A timepiece according to the present invention comprises a plastic rotor holding a magnet, a ground plate made of a plastic material for supporting one tenon of the plastic rotor, and the other of the plastic rotor. In a timepiece having a receiving member made of a plastic material for supporting a tenon, and a stator arranged to face the magnet in a planar direction, one of the bearing portions of the base plate and the receiving member has a concave groove, and the other bearing has A through hole is formed in the portion, and the end face of the tip of the tenon of the plastic rotor pivotally supported by the concave groove is axially positioned by the bottom of the concave groove, and the tenon pivotally supported by the through hole. A convex portion made of burrs is formed on the end face of the tip, and is normally supported in the through hole without protruding outward from the through hole. A support portion for supporting the plastic rotor when the plastic rotor moves in the axial direction due to an impact or the like is formed around the inside of the hole. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. Referring to FIG. 1, 11 is a ground plate formed of a plastic material, and 12 is a plastic rotor having a magnet 13 formed by insert. Reference numeral 14 denotes a fifth wheel made of a plastic material, which comprises a gear 14-a and a pinion 14-b. Reference numeral 15 denotes a fourth gear that meshes with the fifth pinion, and 16 denotes a second gear that meshes with the third pinion (not shown). Reference numeral 17 denotes a stator, and 19 denotes an hour wheel. Since each of them performs a known function, a detailed description is omitted. Reference numeral 18 denotes a train wheel bridge made of a plastic material. As is clear from the figure, the lower tenons 12-a and 14-c of the rotor and the fifth wheel are respectively provided with ground plate holes 11-a and 11-b.
In addition, the upper tenons 12-b and 14-d are loosely fitted in the train wheel receiving holes 18-a and 18-b and are guided and positioned. Wheel train receiver is built in the car guide,
Slope 18-c, 18-
d to improve incorporation. The train wheel receiving holes 18-a and 18-b of the train wheel receiver 18 are formed of concave grooves, and the thickness T of the bottom 20 of the concave groove at the tenon tip side for determining the wheel train agaki is 0.2 due to the necessity of plastic filling. About 0.25 mm is required. According to this configuration, no burrs are generated around the receiving hole of the train wheel bridge, and the end faces of the tenon ends of the rotor and the gear abut against the bottoms of the concave grooves 18-a and 18-b. Since the positioning is performed in the axial direction, the friction area is reduced, and the friction torque loss can be significantly reduced even if the plastic ground plate and the receiving plate are used. The lower tenon of the rotor is supported in the receiving hole 11-a without protruding from the receiving hole 11-a which is usually formed as a through hole in the main plate. This is to prevent the rotor tenon from being in contact with the main plate, as shown in FIG. Reference numeral 11-c denotes a support portion when the rotor largely moves in the axial direction due to an impact or the like, and is formed around the inside of the receiving hole 11-a. At the normal time of the rotor,
The rotor is suspended in the air as shown in FIG. 1 due to the magnetic action of the magnet 13 and the stator 17 disposed facing the plane. Even if the rotor moves largely in the axial direction due to impact or the like, it collides with the support portion 11-c, but the reaction force restores the normal state of FIG. As described above, according to the present invention, since the bearing portion of one bearing member is formed as a through hole, a convex portion due to burrs is formed on the end face of the tenon tip of the plastic rotor holding the magnet. Even though the through hole is formed, the through hole acts as a relief, so that the convex portion comes into contact with the bottom of the concave groove as in the case where the tenon end face is pivotally supported by the concave groove, thereby increasing the frictional resistance. And bring no instability. In addition, in the normal state of the plastic rotor, the tenon tip of the plastic rotor is supported in the through hole without protruding from the through hole. Poor rotation of the plastic rotor due to jamming can be avoided. On the other hand, since the bearing portion on which the other tenon of the plastic rotor is pivotally supported is a concave groove, no burrs are generated at the time of plastic molding, and therefore, there is no fear of rotation failure of the plastic rotor. In addition, the location that comes into contact with the concave groove for axial positioning is the end face of the tenon tip of the plastic rotor,
Since the contact area is reduced and the contact area is easily formed, the frictional resistance is further reduced. Further, since the mortise tip of the plastic rotor is basically supported in the bearing portion without protruding from the base plate and the bearing member of the train wheel bridge, for example, a lubricating needle or a tool is attached to the mortise tip. This has the effect of avoiding the danger of causing the plastic rotor to rotate poorly by colliding and deforming the tenon or generating new burrs.

【図面の簡単な説明】 【図1】本発明による輪列案内構造を示す要部断面図。 【図2】従来例による輪列案内構造を示す要部断面図。 【図3】従来の輪列案内構造における成形型構造を示す
図である。 【符号の説明】 11…地板 12…ローター 14…五番車 18…輪列受
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an essential part showing a train wheel guide structure according to the present invention. FIG. 2 is a sectional view of a main part showing a train wheel guide structure according to a conventional example. FIG. 3 is a view showing a molding die structure in a conventional gear train guide structure. [Description of Signs] 11… Main plate 12… Rotor 14… Fifth wheel 18… Wheel train receiver

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) G04C 3/14 G04B 29/02 G04B 31/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) G04C 3/14 G04B 29/02 G04B 31/00

Claims (1)

(57)【特許請求の範囲】 1.磁石を保持したプラスチックロータと、前記プラス
チックロータの一方のほぞを軸支するプラスチック材か
らなる地板と、前記プラスチックロータの他方のほぞを
軸支するプラスチック材からなる受部材と、前記磁石と
平面方向に対向配置されるステータとを有する時計にお
いて、前記地板と受部材のいずれか一方の軸受部には凹
部溝、他方の軸受部には貫通穴が形成されてなり、前記
凹部溝に軸支される前記プラスチックロータのほぞ先端
の端面は前記凹部溝の底部により軸方向に位置決めさ
れ、前記貫通穴に軸支されるほぞは先端の端面にバリに
よる凸状部が形成されているとともに通常は前記貫通穴
から外方に突出することがなく前記貫通穴内で支持され
ており、前記貫通穴の内方の周囲には、前記プラスチッ
クロータが衝撃等で軸方向に移動した場合に前記プラス
チックロータを支持する支持部が形成されていることを
特徴とする時計。
(57) [Claims] A plastic rotor holding a magnet, a base plate made of a plastic material that supports one tenon of the plastic rotor, a receiving member made of a plastic material that supports the other tenon of the plastic rotor, In a timepiece having a stator disposed opposite to the base plate, a recess groove is formed in one of the bearing portions of the base plate and the receiving member, and a through hole is formed in the other bearing portion, and the shaft is supported by the recess groove. The end face of the tenon tip of the plastic rotor is axially positioned by the bottom of the concave groove, and the tenon that is pivotally supported by the through hole has a convex part formed by burrs on the end face of the tip and usually has the aforementioned shape. The plastic rotor is supported in the through-hole without protruding outward from the through-hole, and the plastic rotor is axially moved by an impact or the like around the inside of the through-hole. Watch it, characterized in that the support portion for supporting the plastic rotor when moving are formed.
JP20840198A 1998-07-23 1998-07-23 clock Expired - Lifetime JP2962320B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20840198A JP2962320B2 (en) 1998-07-23 1998-07-23 clock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20840198A JP2962320B2 (en) 1998-07-23 1998-07-23 clock

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP16169697A Division JPH1054886A (en) 1997-06-18 1997-06-18 Train wheel guiding structure for watch

Publications (2)

Publication Number Publication Date
JPH1194956A JPH1194956A (en) 1999-04-09
JP2962320B2 true JP2962320B2 (en) 1999-10-12

Family

ID=16555652

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20840198A Expired - Lifetime JP2962320B2 (en) 1998-07-23 1998-07-23 clock

Country Status (1)

Country Link
JP (1) JP2962320B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003037988A1 (en) 2001-11-02 2003-05-08 Kitagawa Industries Co., Ltd. Slide part and precision part, and timepiece and electronic device using them

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003054637A1 (en) * 2001-12-21 2003-07-03 Kitagawa Industries Co., Ltd. Timepiece, having bearing portion formed of resin and wheel train
US7167420B2 (en) 2001-12-21 2007-01-23 Kitagawa Industries Co., Ltd Timepiece including base plate formed of resin and wheel train

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003037988A1 (en) 2001-11-02 2003-05-08 Kitagawa Industries Co., Ltd. Slide part and precision part, and timepiece and electronic device using them
US7575800B2 (en) 2001-11-02 2009-08-18 Kitagawa Industries Co., Ltd. Sliding parts, precision parts and timepieces and electronic equipment using the same

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