EP0218894A2 - Dispositif d'amortissement des oscillations d'une aiguille de montre - Google Patents

Dispositif d'amortissement des oscillations d'une aiguille de montre Download PDF

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Publication number
EP0218894A2
EP0218894A2 EP86112266A EP86112266A EP0218894A2 EP 0218894 A2 EP0218894 A2 EP 0218894A2 EP 86112266 A EP86112266 A EP 86112266A EP 86112266 A EP86112266 A EP 86112266A EP 0218894 A2 EP0218894 A2 EP 0218894A2
Authority
EP
European Patent Office
Prior art keywords
pointer
hand
friction element
foam rubber
clock
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.)
Withdrawn
Application number
EP86112266A
Other languages
German (de)
English (en)
Other versions
EP0218894A3 (fr
Inventor
Gerhard Kressner
Walter Dr. Hägele
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.)
Braun GmbH
Original Assignee
Braun GmbH
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 Braun GmbH filed Critical Braun GmbH
Publication of EP0218894A2 publication Critical patent/EP0218894A2/fr
Publication of EP0218894A3 publication Critical patent/EP0218894A3/fr
Withdrawn legal-status Critical Current

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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
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears
    • 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
    • G04B19/00—Indicating the time by visual means
    • G04B19/04—Hands; Discs with a single mark or the like
    • G04B19/044—Mounting and setting of the hands on the axle

Definitions

  • the invention relates to a device for damping the ringing of a clock hand according to the preamble of claim 1.
  • the hands are moved step by step from one display value to the next.
  • the pointer executes an optically disturbing reverberation movement after completion of the movement.
  • This swinging out or reverberation occurs particularly with long hands and, if the watch is suspended vertically, the oscillation amplitude of the tip of the hand has a different value due to gravity depending on the position of the hand.
  • the vibration amplitude is largest in the six and twelve o'clock range and smallest in the three and nine o'clock range.
  • the pointers also have an axial play, which can be heard in the form of impulsive noise in cooperation with the post-oscillation process of the tip.
  • the noise generated by the swinging-out process is particularly disruptive when the watch is standing on a table, for example, and is reinforced by a bodywork cable.
  • the device for damping the oscillation of the pointer consists of an elastic friction element. Due to the elastic friction element, the oscillation of the pointer after reaching the rest position is advantageously achieved while at the same time reducing the background noise that results from the play of the gears of the clockwork.
  • the elastic friction element consists of a compression spring or a correspondingly shaped piece of rubber, e.g. Foam.
  • the elastic friction element can also be made of a different material - e.g. Silicone rubber - consist.
  • the elasticity of the friction element also has the advantage that the dimensions of the friction element do not have to be overly precise.
  • the friction force of the friction element can be determined by its oversize.
  • the contact force normal force
  • the resulting frictional force can be determined on the one hand by varying the coefficient of friction (choice of materials) and on the other hand by the inherent elasticity and size of the friction element.
  • Figure 1 shows an average of a clock with a second hand 4, a minute hand 5 and an hour hand 6.
  • the clockwork of the clock is not shown, which is why only three axes 10, 11 and 12 for the hands 4, 5 and 6 can be seen in Figure 1 are.
  • the axes 10, 11 and 12 of the hands pass through an opening 13 in a housing 1 and in a dial 3 of the clock from the clockwork not shown to the hands 4, 5 and 6.
  • axis 10 is for the second hand 4 the innermost axis.
  • a hub 20 is formed on a dial plate 7 of the second hand 4, which is plugged onto the axis.
  • the hub 20 and the axle 10 in the hub attachment area can be correspondingly shaped, e.g. is represented by a square axis bore 21 in FIG. 2; However, a pure clamp protection is also conceivable.
  • the minute hand 5 likewise has a pointer plate 8 which is fitted without a hub (or also with a corresponding hub) onto the sleeve-shaped axis 11 which surrounds the axis 10 of the second hand.
  • the hour hand 6 with its pointer plate 9 is plugged onto the associated sleeve-shaped axis 12, which in turn encloses the two aforementioned axes 10 and 11.
  • the pointer plates 8 and 9 are connected and fixed to the axes 11 and 12 in a known manner.
  • the second hand 4 performs the fastest movement. This results in particular when the second hand 4 is driven by a stepping mechanism Disadvantage that the second hand does not come to rest immediately after acceleration from one second position to the next and therefore oscillates. This reverberation results from the moment of inertia of the second hand 4 and the play of the drive wheels. Furthermore, the vibration amplitude of the aperiodic vibration increases with the length of the pointer. In addition, the second hand 4, together with the axis 10, has an axial displacement possibility due to the bearing play.
  • the oscillation of the pointer tip 15 of the second hand 4 is optically disruptive; at the same time, the previously described play of the clockwheels of the clockwork leads to unpleasant noise which can be heard as the clock ticking. Even if the invention is explained below using the second hand 4, the invention is not limited to the second hand. Rather, numerous clocks are known whose hands have the same problems described above and on which the invention can be embodied.
  • a foam rubber buffer 14 is formed between the top of the dial 7 of the second hand 4 and the bottom of the cover glass 2 of the watch.
  • the foam rubber buffer 14 In the non-installed state, the foam rubber buffer 14 has a somewhat greater height, which corresponds to the distance - top of the pointer plate 7 to the bottom of the cover glass 2.
  • the foam rubber buffer 14 is preferably glued on one side to the cover glass 2 or the pointer plate 7.
  • the bead 19 can also serve as an assembly aid.
  • the foam buffer 14 For example, if the foam buffer 14 is at the time gerteller 7 is glued, rubs the top of the foam rubber buffer 14 with the movement of the second hand 4 on the underside of the cover glass 2.
  • the foam rubber buffer 14 acts as an elastic friction element that with a certain normal force on the underside of the cover glass 2 is pressed.
  • this embodiment of the elastic friction element in the form of the foam rubber buffer 14 has the advantage that the axial play is reduced. The disturbing optical swinging of the pointer tip 15 and the disturbing playing noise are thus eliminated or reduced by the foam rubber buffer 14.
  • the surface of the cover slip 2 acted upon by the foam rubber buffer 14 can be roughened accordingly in order to increase the coefficient of friction.
  • Another embodiment of the increase in friction between the second hand 4 and a fixed watch part is the fitting of the tip 15 with a foam rubber tip 16.
  • the foam rubber tip 16 rubs against the inside of the watch case 1 and can be correspondingly smaller due to the lever arm that the second hand 4 forms be formed.
  • the foam rubber tip 16 is attached or glued to the pointer tip 15 and the pointer tip 15 of the second hand 4 is pointed in the manner shown in FIG. 1.
  • the foam rubber tip 16 can contribute to better visibility of the second hand and acts in the manner described above like the foam rubber buffer 14; however, the foam rubber tip 16 can only dampen the axial play of the axis 10 to a small extent.
  • One application of the foam tip 16 is therefore indicated in cases where the noise comes mainly from the play of the drive wheels and less from the axial play.
  • the foam rubber tip 16 can also be directed onto the cover glass 2 (additionally or exclusively not shown).
  • FIG. 1 Another exemplary embodiment is the compression spring 17 shown in FIG. 1, which is formed between the pointer plate 7 and the pointer plate 8. So that the compression spring 17 can be arranged here, it has an inner diameter that is larger than the axis 11 of the minute hand 5. However, it is possible to clamp the compression spring 17 firmly on the axis 11 and to press it on the pointer plate 7.
  • the ends of the compression spring 17 are embedded in ring grooves 18 which are formed on the dial plates 7 and 8.
  • the winding direction of the compression spring 17 is oriented with respect to the direction of movement of the second hand 4 so that the compression spring 17 does not open as the pointer plate 7 moves.
  • the friction surfaces form the ends of the compression spring 17 with the grooves 18 of the pointer plates 7 and 8.
  • the pointer plate 8 takes place here Movement of the minute hand 5 compared to the second hand 4 is significantly slower, the movement of the minute hand 5 does not represent a disadvantage for the vibration damping. Rather, the minute hand 5 compared to the second hand 4 is to be regarded as stationary for the intended purpose.
  • the compression spring 17 simultaneously prevents axial play, the compression spring 17, in contrast to the foam rubber buffer 14, pushing the axis 10 outwards. Instead of the compression spring 17, it is also possible to provide a suitable rubber tube as an elastic friction element.
  • FIG. 1 shows an elastic friction element in the form of a foam rubber sleeve 22, which is formed between the axis 11 of the minute hand 5 and the axis 10 or the hub 20 of the second hand 4.
  • the foam rubber sleeve 22 can be glued, for example, for mounting on the hub 20 and somewhat flattened at the insertion area.
  • the friction surfaces here form the outer surface of the foam rubber sleeve 22 and the loaded inside of the axle 11. It may be advantageous that the foam rubber sleeve 22 is soaked in oil and thus serves as a lubricant reservoir.
  • FIG. 2 shows the second hand from FIG. 1 without a foam rubber tip 16 from the underside and the preferably round dial plate 7 with the annular groove 18 can be seen.
  • the hub 20 is shown with the axis bore 21 which is square in cross section and which serves as an anti-rotation device.
  • Figure 3 shows the second hand 4 from the top with an inserted foam rubber buffer 14 which is surrounded by the bead 19.
  • a foam rubber tip 16 is attached to the tip, for example, which, as shown, has, for example, a convex curvature which is adapted to the curvature of the circular inner wall of the watch case 1.
  • the desired pointer damping is selected in size so that the power consumption of the watch is not significantly increased, the second hand does not come to a standstill and the accuracy of the movement is not impaired. If necessary, it is possible to combine several of the exemplary embodiments shown with one another.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
EP86112266A 1985-10-12 1986-09-04 Dispositif d'amortissement des oscillations d'une aiguille de montre Withdrawn EP0218894A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3536439 1985-10-12
DE19853536439 DE3536439A1 (de) 1985-10-12 1985-10-12 Vorrichtung zum daempfen der nachschwingungen eines uhrzeigers

Publications (2)

Publication Number Publication Date
EP0218894A2 true EP0218894A2 (fr) 1987-04-22
EP0218894A3 EP0218894A3 (fr) 1989-01-04

Family

ID=6283436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86112266A Withdrawn EP0218894A3 (fr) 1985-10-12 1986-09-04 Dispositif d'amortissement des oscillations d'une aiguille de montre

Country Status (2)

Country Link
EP (1) EP0218894A3 (fr)
DE (1) DE3536439A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103149829A (zh) * 2011-12-07 2013-06-12 Eta瑞士钟表制造股份有限公司 具有显示部件的组合的显示设备
CN111512244A (zh) * 2017-12-15 2020-08-07 斯沃奇集团研究和开发有限公司 钟表壳体的关闭/打开系统
WO2021104830A1 (fr) * 2019-11-25 2021-06-03 Eta Sa Manufacture Horlogère Suisse Lubrification laterale de tubes coaxiaux

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6800934U (de) * 1968-10-04 1969-09-25 Junghans G M B H Fa Geb Vorrichtung an einem uhrwerk zum bremsen einer getriebewelle
DE7910592U1 (de) * 1979-04-11 1979-10-04 Fa. Mueller-Schlenker, 7220 Schwenningen Uhr mit Befestigungsvorrichtung für eine Bremsfeder
FR2449914A1 (fr) * 1979-02-21 1980-09-19 Suisse Horlogerie Montre-bracelet avec frein entre la roue des heures et le cadran

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH1787073A4 (fr) * 1973-12-20 1977-04-29

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6800934U (de) * 1968-10-04 1969-09-25 Junghans G M B H Fa Geb Vorrichtung an einem uhrwerk zum bremsen einer getriebewelle
FR2449914A1 (fr) * 1979-02-21 1980-09-19 Suisse Horlogerie Montre-bracelet avec frein entre la roue des heures et le cadran
DE7910592U1 (de) * 1979-04-11 1979-10-04 Fa. Mueller-Schlenker, 7220 Schwenningen Uhr mit Befestigungsvorrichtung für eine Bremsfeder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103149829A (zh) * 2011-12-07 2013-06-12 Eta瑞士钟表制造股份有限公司 具有显示部件的组合的显示设备
CN103149829B (zh) * 2011-12-07 2015-06-24 Eta瑞士钟表制造股份有限公司 具有显示部件的组合的显示设备
CN111512244A (zh) * 2017-12-15 2020-08-07 斯沃奇集团研究和开发有限公司 钟表壳体的关闭/打开系统
WO2021104830A1 (fr) * 2019-11-25 2021-06-03 Eta Sa Manufacture Horlogère Suisse Lubrification laterale de tubes coaxiaux

Also Published As

Publication number Publication date
EP0218894A3 (fr) 1989-01-04
DE3536439A1 (de) 1987-04-16

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Inventor name: HAEGELE, WALTER, DR.