EP0021494B1 - Elektronische Uhr mit Zeitanzeige durch Zeiger und mit einem Drehungsdetektor - Google Patents

Elektronische Uhr mit Zeitanzeige durch Zeiger und mit einem Drehungsdetektor Download PDF

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Publication number
EP0021494B1
EP0021494B1 EP80200529A EP80200529A EP0021494B1 EP 0021494 B1 EP0021494 B1 EP 0021494B1 EP 80200529 A EP80200529 A EP 80200529A EP 80200529 A EP80200529 A EP 80200529A EP 0021494 B1 EP0021494 B1 EP 0021494B1
Authority
EP
European Patent Office
Prior art keywords
blade
wheel
disc
counting wheel
counting
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
Application number
EP80200529A
Other languages
English (en)
French (fr)
Other versions
EP0021494A1 (de
Inventor
Norbert Perucchi
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.)
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
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 Ebauchesfabrik ETA AG filed Critical Ebauchesfabrik ETA AG
Publication of EP0021494A1 publication Critical patent/EP0021494A1/de
Application granted granted Critical
Publication of EP0021494B1 publication Critical patent/EP0021494B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor

Definitions

  • the subject of the present invention is an electronic watch with a needle display comprising a cog driving the hands and a stepping motor driving the cog, and in which the cog comprises a counting wheel provided with a tracking device which cooperates with a movable detector member linked to a detection circuit and to a counter, said detector member being capable of causing the emission of signals in the detection circuit when the counting wheel performs a rotational movement and comprising an elastic blade secured to a piezoelectric element.
  • the movable detector member is intended to detect the rotation of the gear train each time a pulse is sent to the engine.
  • the locating device here consists of a peripheral toothing of the counting wheel. This toothing is symmetrical and the detector member comprises a flexible blade provided with a piezoelectric element and at its free end with a pawl-shaped part which is engaged in the toothing of the counting wheel. When the latter rotates in one direction, it moves the pawl with each passage of the tooth, so that a signal is emitted by the piezoelectric element.
  • This known device has the function of controlling the duration of the pulses given to the motor and the conformation of the pawl is such that if the counting wheel is driven in the opposite direction to the normal direction, it is blocked by the pawl.
  • US-A-3,553,957 also describes an electronic timepiece equipped with a detector device.
  • the production of the device involves electrical contacts between a movable disc and fixed electrodes, so that the reliability of the device is not guaranteed. Its functions are only performed at random. Due to the unreliability of the rotation detectors known until now, the practical introduction of these detectors into watches intended for trade has not yet been possible on a large scale.
  • the object of the present invention is therefore to propose a detector device which is both perfectly reliable and as compact as possible.
  • the object of the present invention is characterized in that the locating device comprises at least one pair of ramps rigidly integral with the counting wheel, inclined relative to its plane, oriented in opposite directions, in that that the elastic blade is arranged radially relative to the counting wheel at a fixed location, and that the blade has a free end which extends in the path of said ramps so as to be deflected elastically and then released during the rotation of the counting wheel by one or the other of said ramps and in one direction or the other according to the direction of rotation of the counting wheel.
  • Disc 1 The mechanical part of the detector is shown in fig. 1.
  • a disc 1 of circular shape, having a radial slot 2 of shallow depth and whose width is constant from the periphery of the disc to the bottom of this slot.
  • the two edges of the slot are slightly bent, one up and the other down.
  • the folded up edge is designated in fig. 1 by 3a and the one folded down by 3b.
  • Disc 1 will be mounted on the shaft of a gear train. For this purpose, it is cut with a central hole 4 but it is understood that any other form of mounting may also be suitable.
  • the disc 1 is a thin plate which can be a metal plate.
  • the speed of rotation of the disk 1 is not a critical datum of the device described. This means that, depending on the case, this disc can be mounted, for example, on the seconds wheel, on the minutes wheel or on an intermediate wheel between the seconds wheel and the minutes wheel.
  • this disc can be mounted, for example, on the seconds wheel, on the minutes wheel or on an intermediate wheel between the seconds wheel and the minutes wheel.
  • the mechanical components of the detector also comprise a detector plate designated by 5. It is a metal plate, for example made of beryllium bronze, capable of bending elastically.
  • This blade will be fixed to a frame element of the movement, for example a stud shown in 6. It extends radially in the direction of the axis of the hole 4. In the embodiment shown diagrammatically in the drawing, it is fixed by a screw 7 , however, any other more complete attachment method may also be suitable.
  • the length of the blade 5 is such that its free end situated on the side of the disc 1 projects slightly over this disc.
  • a piezoelectric blade, for example a thin quartz blade designated by 8 is fixed, for example by gluing on one of the faces of the blade 5.
  • the blade 5 will itself be connected to the ground of the movement by connections not shown to the drawing. As for the upper face of the blade 8, it will be connected by a wire 9 to a circuit for processing the detection signals which will be described later. It is understood that if the blade bends, upwards for example, relative to its rest position, a tension of a certain polarity, for example positive, will appear in the wire 9 while if it bends downwards, the tension which will appear in this wire will be a voltage of reverse polarity, for example negative.
  • the blade 5 will be oriented and positioned so as to be exactly in the plane of the disc 1, so that, when its end rests on the upper surface of this disc, as seen in FIG. 1, the piezoelectric blade 8 is slightly bent upwards. As a result, a slight tension, for example positive, appears in connection 9 and is maintained as long as the blade remains in the relative position shown in FIG. 1 compared to disk 1.
  • Fig. 2 shows how the end of the blade 5 cooperates with the disc 1 and in particular with the raised edges 3a and 3b when the disc 1 rotates. Assuming that this disc rotates in the direction of arrow 10, visible as well in FIG. 2 as in fig. 1, it can be seen that all the points on the periphery of the disc pass successively under the end of the blade 5. When the disc has made almost a full revolution, the raised edge 3a arrives in the area of the blade 5, so that the latter is urged upwards by the upper face of the edge 3a which acts as a ramp. It arrives in the position shown in FIG. 2.
  • the raised edge 3a passes under the end of the blade 5 and arrives in a position where the blade is completely released in the slot 2. It then falls under the effect of its elasticity, and tends towards a middle position which it reaches after having carried out some vibrations. If the disc 1 continues to rotate in the same direction, the blade 5 comes back into contact with the disc 1 but this time with the upper face of the folded edge 3b. When the disc has made a full revolution, the blade returns to position b shown in fig. 2 and which corresponds to the position of FIG. 1.
  • Fig. 4 schematically shows how a detection and counting circuit capable of fulfilling these functions can be produced.
  • the quartz blade 8, the wire 9 and a connection 110 which connects the underside of the strip 8 to the ground and which symbolizes the fixing of 'this quartz blade on the elastic blade 5.
  • the wire 9 is connected to the midpoint between two resistors 111 and 112 placed in series between the voltage source V and the ground. This midpoint is connected to an input of an amplifier 113 whose outlet comprises an upper branch 114 and a lower branch 114 '.
  • the positive voltage spikes will be selected and shaped in the discrimination circuit 115 while the negative voltage spikes will be selected in the discriminator circuit 116.
  • the outputs of these two circuits give rectangular pulses calibrated each time a spike of positive or negative voltage is recorded.
  • the two circuits 115 and 116 can be constituted by monostable flip-flops.
  • Circuit 117 is a detector which determines whether the pulses coming from circuits 115 and 116 should be counted positively or negatively and which directs these pulses to counter 118.
  • the latter has an input connected to detector 117 and an input connected by a gate 119 at the output of the two circuits 115 and 116.
  • the counter 118 performs the algebraic counting of the pulses received and consequently determines the number of revolutions made by the disc 1 by counting positively when the disc turns in one direction and negatively when it turns in the other.
  • a single detector blade 5 it is possible to provide a counting mobile which is provided with several regularly distributed notches along its periphery, which makes it possible to determine the angle which the mobile 1 has turned with details which may be much greater than the 360 ° represented by the presence of a single notch.
  • the use of a single detector blade makes it possible to carry out much finer angular detections than when using several contacts or several photosensitive diodes arranged along the periphery of the disc.
  • the device described above can be used for example in a system for setting the time of the watch. If it is found that the watch delays, it is necessary to inject pulses into the motor so as to make it rotate rapidly in the positive direction until the second hand is on 60 for example. On the other hand, if the watch is advancing, it may be advantageous to quickly reverse the second hand to the position of 60 so that, in both cases, the watch stops with its second hand in the starting position. and can be reset instantly at the top second. It suffices for this to have a motor capable of rotating, either in one direction or in the other, depending on the polarity of the pulses that its coil receives and to control this rotation in one direction or the other following the maneuver to be performed.
  • a detector as described can also be used in a watch whose position of the hour hand can be corrected by jumping an hour, half an hour or fifteen minutes in order to be adjusted to a new time zone schedule. Still other functions can be performed by means of such a device.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
  • Electric Clocks (AREA)

Claims (3)

1. Elektronische Uhr mit Zeitanzeige durch Zeiger, mit einem die Zeiger antreibenden Räderwerk und mit einem das Räderwerk antreibenden Schrittmotor, wobei das Räderwerk ein Zählrad (1) aufweist, das mit einer Auffindvorrichtung versehen ist, welche mit einem beweglichen Aufspürorgan (5, 8) zusammenarbeitet, das mit einem Aufspürstromkreis (111-117-119) und mit einem Zähler (118) verbunden ist, wobei das Aufspürorgan dazu befähigt ist, die Abgabe von Signalen im Aufspürstromkreis hervorzurufen, wenn das Zählrad eine Drehbewegung ausführt, und ein elastisches Blatt (5) und ein mit dem Blatt starr verbundenes piezo-elektrisches Element aufweist, dadurch gekennzeichnet, dass die Auffindvorrichtung mindestens ein Paar von Rampen (3a, 3b) aufweist, die starr mit dem Zählrad (1) verbunden sind, zu dessen Ebene geneigt und gegensinnig orientiert sind, dass das elastische Blatt (5) inbezug auf das Zählrad (1) radial angeordnet, und zwar an einer unverrückbaren Stelle, und dass das Blatt ein freies Ende hat, das sich derart in den Weg der besagten Rampen (3a, 3b) erstreckt, dass es durch die eine oder andere Rampe elastisch ausgelenkt und danach wieder freigegeben wird im Laufe der Drehung des Zählrades, und zwar im einen oder im anderen Sinne je nach dem Drehsinn des Zählrades.
2. Uhr nach Anspruch 1, dadurch gekennzeichnet, dass das Zählrad (1) aus einer dünnen Scheibe mit kreisförmigem Umfang besteht, die einen radialen Schlitz (2) besitzt, dessen Breite unter Ausserachtlassung des Spieles gleich gross ist wie jene des Aufspürblattes (5), und dass von den Rändern des besagten radialen Schlitzes der eine zur einen Seite (3a), der andere zur anderen Seite (3b) aus der Ebene der Scheibe angehoben ist.
3. Uhr nach Anspruch 1, dadurch gekennzeichnet, dass das piezo-elektrische Aufspürelement (8) in der Nähe seines an einem Gehäuse (6) befestigten Endes auf der Scheibe (5) angebracht ist, und eine der Flachseiten dieses piezoelektrischen Elementes an die Masse angeschlossen ist mittels des Blattes, wogegen die andere Flachseite an einen der Aufbereitung der Zählsignale dienenden Stromkreis angeschlossen (9) ist.
EP80200529A 1979-06-28 1980-06-09 Elektronische Uhr mit Zeitanzeige durch Zeiger und mit einem Drehungsdetektor Expired EP0021494B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH604779A CH629356B (fr) 1979-06-28 1979-06-28 Montre electronique dont le rouage comporte un mobile de comptage.
CH6047/79 1979-06-28

Publications (2)

Publication Number Publication Date
EP0021494A1 EP0021494A1 (de) 1981-01-07
EP0021494B1 true EP0021494B1 (de) 1984-11-28

Family

ID=4303368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80200529A Expired EP0021494B1 (de) 1979-06-28 1980-06-09 Elektronische Uhr mit Zeitanzeige durch Zeiger und mit einem Drehungsdetektor

Country Status (5)

Country Link
US (1) US4348752A (de)
EP (1) EP0021494B1 (de)
JP (1) JPS5631676A (de)
CH (1) CH629356B (de)
DE (1) DE3069694D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6965543B1 (en) * 2000-10-24 2005-11-15 Kienzle Time (Hong Kong) Limited Radio controllable clock
US6909222B2 (en) * 2002-03-01 2005-06-21 Seiko Epson Corporation Piezoelectric actuator, and timepiece and portable equipment having the same
JP2015052543A (ja) * 2013-09-09 2015-03-19 カシオ計算機株式会社 スイッチ機構及び時計

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH205066A4 (de) * 1966-02-10 1969-08-15
DE2125224C3 (de) * 1971-05-21 1980-12-18 Forschungsgesellschaft Fuer Uhren- Und Feingeraetetechnik E. V., 7000 Stuttgart Vorrichtung zur Korrektur des Ganges eines zeithaltenden Gerätes
US3958167A (en) * 1972-12-04 1976-05-18 Citizen Watch Co., Ltd. Pulse motor
JPS5542356B2 (de) * 1972-12-22 1980-10-30
JPS525566A (en) * 1975-07-02 1977-01-17 Citizen Watch Co Ltd Electric clock
JPS5214452U (de) * 1975-07-18 1977-02-01
GB1510744A (en) * 1975-09-11 1978-05-17 Diehl Electro-mechanical adjustment means for adjusting an electronic digital indicator
JPS5342079A (en) * 1976-09-28 1978-04-17 Citizen Watch Co Ltd Electronic watch
JPS5398884A (en) * 1977-02-09 1978-08-29 Seikosha Kk Counter
CH620085B (fr) * 1977-12-31 Ebauchesfabrik Eta Ag Montre a quartz et dispositif d'affichage analogique a commande manuelle de changement d'heure.
US4209976A (en) * 1978-08-11 1980-07-01 Timex Corporation Means of setting a solid state watch

Also Published As

Publication number Publication date
DE3069694D1 (en) 1985-01-10
JPS5631676A (en) 1981-03-31
EP0021494A1 (de) 1981-01-07
CH629356GA3 (de) 1982-04-30
CH629356B (fr)
JPS628158B2 (de) 1987-02-20
US4348752A (en) 1982-09-07

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