US3707841A - Eccentric cam structure for an automatically wound watch - Google Patents

Eccentric cam structure for an automatically wound watch Download PDF

Info

Publication number
US3707841A
US3707841A US00212245A US3707841DA US3707841A US 3707841 A US3707841 A US 3707841A US 00212245 A US00212245 A US 00212245A US 3707841D A US3707841D A US 3707841DA US 3707841 A US3707841 A US 3707841A
Authority
US
United States
Prior art keywords
cam
weight
central axis
eccentric
automatically wound
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
US00212245A
Other languages
English (en)
Inventor
M Miyasaka
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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 Suwa Seikosha KK filed Critical Suwa Seikosha KK
Application granted granted Critical
Publication of US3707841A publication Critical patent/US3707841A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B5/00—Automatic winding up
    • G04B5/02—Automatic winding up by self-winding caused by the movement of the watch
    • G04B5/18—Supports, suspensions or guide arrangements, for oscillating weights
    • G04B5/19—Suspension of the oscillating weight at its centre of rotation
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/02—Devices allowing the motion of a rotatable part in only one direction
    • G04B11/04—Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B5/00—Automatic winding up
    • G04B5/02—Automatic winding up by self-winding caused by the movement of the watch
    • G04B5/16—Construction of the weights
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B5/00—Automatic winding up
    • G04B5/02—Automatic winding up by self-winding caused by the movement of the watch
    • G04B5/16—Construction of the weights
    • G04B5/165—Weights consisting of several parts

Definitions

  • ABSTRACT A cam for mounting in an oscillating weight in an automatically wound watch has a central axis and a lateral surface which is a surface of revolution about said central axis. The fact that the lateral surface is a surface of revolution simplifies the forming of the cam. The cam is then mounted eccentrically in the oscillating weight responsiblefor winding the watch.
  • the cam of the present invention has a lateral surface which is a surface of revolution about a central axis in the cam. This makes cutting of the cam a remarkably simple operation which can be carried out with great precision.
  • the cam is pierced by a cylindrical opening which is displaced from the central axis.
  • the oscillating weight responsible for winding the watch has a periphery which in part is circular and has an opening therethrough which is eccentric to the periphery thereof. The opening is designed to receive the cam in a position such that the cylindrical opening through the cam is concentric with the circular part of the periphery of the oscillating weight.
  • an object of the present invention is to provide an improved cam structure which can be cut with high precision.
  • Another object ofthe present invention is to provide an improved cam structure in which the lateral surface is a surface of revolution.
  • a further object of the present invention is to provide an improved cam structure which-is suitable for mass-production, is low in cost, and can be made with high precision.
  • FIGS. 1 and 2 show cam structures used in conventional automatically wound watches
  • FIG. 3 is vertical section taken along the line 3-3 of FIG. 2;
  • FIG. 4 is a cam structure in accordance with the present invention
  • FIG. 5 is a vertical section taken along the line 5-5 of FIG. 4.
  • a cam 3 having a cam surface 1 as shown in FIGS. l3 is mounted concentrically on an oscillating weight having a circular periphery.
  • Cam 3 of the prior art has a shoulder 5 on which cam-follower 11 rides.
  • Cam 3 is pierced by cylindrical hole 2 and shoulder 5 is concentric with cylindrical hole 2.
  • opening 4 in oscillating weight 8 is concentric with hole 2.
  • Portion 6 is that part of cam 3 which is peened over in order to hold cam 3 within weight 8.
  • cam 3 all parts of cam 3 are concentric with hole 2, which, in turn, is concentric with the periphery of weight 8.
  • the cam surface 1 is not concentric with hole 2 which gives rise to the aforenoted difficulties in achieving the required precision under conditions which permit mass-production at low cost.
  • cam 7 In the embodiment of the present invention as'shown in FIGS. 4 and 5, all parts of cam 7 are concentric with axis line 0. Consequently it is easy to cut this cam with great precision and under conditions such as are conductive to low cost in mass-production.
  • the hole having the axis 0 is drilled eccentrically parallel to central line 0.
  • opening 9 is cut in oscillating weight 8 eccentrically with respect to the periphery of oscillating weight 8.
  • the displacement of hole 9 from the center of weight 8 is such that when cam 7,is placed in hole 9 in proper orientation, center line 0' corresponds with the axis ofoscillating weight 8.
  • cam 7 the entire lateral surface of cam 7 including shoulder 10 and cam-surface l2 constitute a surface of revolution around axis 0. v
  • An improved eccentric cam structure for an automatically wound watch comprising a cam having a A central axis and a cylindrical eccentric opening parallel to said central axis, said cam having a lateral surface which is a surface of revolution about said central axis, a weight adapted to oscillate said cam structure, said weight having a periphery part of which is circular, and having an eccentric cylindrical opening for receiving said cam in a position such that said eccentric opening in said cam is concentric with said circular periphery of said weight and a cum-follower, said cam having a shoulder in said lateral surface on which said cum-follower is adapied to ride.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission Devices (AREA)
  • Electromechanical Clocks (AREA)
  • Gears, Cams (AREA)
US00212245A 1970-12-28 1971-12-27 Eccentric cam structure for an automatically wound watch Expired - Lifetime US3707841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970132712U JPS517901Y1 (enrdf_load_stackoverflow) 1970-12-28 1970-12-28

Publications (1)

Publication Number Publication Date
US3707841A true US3707841A (en) 1973-01-02

Family

ID=15087795

Family Applications (1)

Application Number Title Priority Date Filing Date
US00212245A Expired - Lifetime US3707841A (en) 1970-12-28 1971-12-27 Eccentric cam structure for an automatically wound watch

Country Status (4)

Country Link
US (1) US3707841A (enrdf_load_stackoverflow)
JP (1) JPS517901Y1 (enrdf_load_stackoverflow)
CH (2) CH582372B5 (enrdf_load_stackoverflow)
DE (1) DE2165079C3 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855779A (en) * 1973-02-22 1974-12-24 Ebauchesfabrik Eta Ag Pivoting device for the winding weight of an automatic watch
USD725530S1 (en) * 2014-11-04 2015-03-31 Graff Diamonds Sa Watch rotor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1300194A (fr) * 1961-06-12 1962-08-03 Holding Favre Leuba S A Montre à remontage automatique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1300194A (fr) * 1961-06-12 1962-08-03 Holding Favre Leuba S A Montre à remontage automatique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855779A (en) * 1973-02-22 1974-12-24 Ebauchesfabrik Eta Ag Pivoting device for the winding weight of an automatic watch
USD725530S1 (en) * 2014-11-04 2015-03-31 Graff Diamonds Sa Watch rotor

Also Published As

Publication number Publication date
JPS517901Y1 (enrdf_load_stackoverflow) 1976-03-02
DE2165079A1 (de) 1972-07-27
CH1898371A4 (enrdf_load_stackoverflow) 1976-06-30
CH582372B5 (enrdf_load_stackoverflow) 1976-11-30
DE2165079B2 (de) 1974-02-21
DE2165079C3 (de) 1974-09-19

Similar Documents

Publication Publication Date Title
WO1997007435A1 (fr) Horlogerie mecanique a mecanisme tourbillon
US3707841A (en) Eccentric cam structure for an automatically wound watch
US3945197A (en) Timepiece
US3845616A (en) Lever escapement for a timepiece movement
US3901018A (en) Timepiece
US4074517A (en) Gear train for a wrist watch
US3487633A (en) Dial train friction device
US3952499A (en) Watch cases, dials and bezels
GB1453549A (en) Stem locking mechanism for electric calendar watches
US4186322A (en) Electric rotary stepping motor
US3956881A (en) Hairspring and collet assembly for timepieces
US3121990A (en) Watch movement
US3916614A (en) Timepiece provided with a guide bush
US3852954A (en) Mechanical watch movement
US3638419A (en) Horological hairspring regulator
US3888077A (en) Mechanical watch movement
US3834154A (en) Device for fastening the inner end of a mainspring to the barrel arbor of a clockwork
US3628323A (en) Miniaturized electronic watch
US3906714A (en) Watch escapement
US3635011A (en) Elapsed-time indicator
KR20010021364A (ko) 시계 운동장치
US3842592A (en) Arrangement for securing the hairspring stud on a watch frame part
US3808792A (en) Drive mechanism of an electric timepiece
JP2003121569A (ja) アンテナ付電子時計
US2763123A (en) Fork safety means for clocks with pallet escapement