DE1523854A1 - Switching device for step-by-step switching of a hand-driving wheel of a clock - Google Patents

Description

DIPL.-INQ. M. SC.

HÖGER - LEGAL RIGHTS - GRIESSBACH 1523854

PATENT LAWYERS IN STUTTGART

A 34 409 h
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The United States Time Corporation 'Middlebury / Connecticut, U.S.A'

Switching device for stepwise switching a hand-driving wheel of a watch

The invention relates to a switching device for the step-by-step switching of a wheel driving a pointer a clock, preferably the fourth wheel

It is already known to equip both electrically and spring-operated clocks with a switching device for the step-by-step switching of a hand, in particular the seconds hand. Such switching directions show U ^: > Uchcm '/ <3xf each corresponding hand wheel in seconds

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at intervals of the same so-called switching device. The so-called Springaecustomer connection comes about here because Vibrations generated by an electrically or mechanically controlled drive device via a Scnaltr> ad the switching device transferred and there by large mechanical effort divided into certain frequency units are, then each after a predetermined Number of such frequency units a switching step is carried out. Such switching devices must therefore

To be timed to certain frequencies of rest are in their construction is complex and significantly increase the manufacturing costs of such watches.

The invention now has for its object to simplify such switching devices substantially and be designed so that they operate reliably at any Unruhfrequenis, Brfindungsgemäss this object is achieved in that the switching device is a form-locking connected to the Sehaltrac, with at least one S _ö hrä ^ - Has curses in the teeth of the pointer driving Hades gripping, axially displaceable switching element. . is controllable with the help of a control device in a Boreiiuurhai '.. position, from which it is in Abhäii £ ii & k «v; v, -

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the movement of the switching wheel by means of a beta Tigungs ^ device in a switching position Uherführbar, wherein during the switching movement of the switching member the same which interacts with the hand wheel inclined surface further switches to a step caused by dio by the ratchet wheel advancement of the Schaltgliedec λ

the same can be returned to its kit-taking position without turning the wheel driving the pointer. This construction shows as a functionally essential part that from a Already detention position in a holding position so maintainable, with the pointer driving wheel cooperating switching element, the switching movement depending on the movement of the ratchet wheel - j) the desired jump ~ customer switching is thus guaranteed at every balance frequency, whereby by the arrangement of the for forwarding | deß pointer wheel provided on the switching element inclined surface the desired simple design of the switching device could be achieved.

Both the construction of the control device and that of the actuating device for controlling the? Switching element can be very diverse and, above all, very simple, since the fj ^r for devices only serve the purpose of the j.iod ~ ':, i iiii Derc: l.tt: -'. ^s } ic; 'iTi: i. ^: - bsvv ... bcbeXtcrellunr to

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steer. According to the invention let the control device βο designed that they are both used to reset the Sohalt Linkes in its readiness ale auoh for release the same is used by the actuating device only the adjustment of the holding member in his

'Sohaltettllung has to take over. According to the invention is the design is such that the control device has adjustment and transmission elements, which interact with each other in a form-fitting manner. In this context it is conceivable, for example, to use the holding element to be arranged non-rotatably on a corresponding carrier shaft, but axially displaceable, in order to control it into the standby s- or switching position. The adjustment the holding member in its ready-to-hold position as well as

) its release can be done by adjusting and transmission elements that act directly or indirectly on the switching element. In a preferred embodiment, both the carrier shaft carrying the switching element and the so-called soak wheel form part of the control device, so that a component consisting of these parts results, which acts indirectly on the switching element to adjust it and is axially displaceable in the relevant clockwork for this purpose se ir- must.

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According to the invention, the task here falls to the ratchet wheel to adjust the carrier shaft and it itself axially, which sioh achieve depending on its movement lets when your ratchet wheel according to the invention on it is assigned an acting, atationary adjustment part is, daö with the corresponding ^ provided on the ratchet wheel

Transmission links cooperate in a form-fitting manner. These Transmission elements can be arranged on the ratchet wheel and attached in such a way that the ratchet wheel from. Switching element and carrier shaft brought the existing component into its ready position and released at the right time will cause the actuator to come into action and the component can move in the opposite direction in order to transfer the switching element to its so-called split » According to the invention, the transmission elements on the switching I wheel arranged distributed on a circular path. It is also

a construction is conceivable in which this transmission is provided on the switching element, so that there would be a direct link directly / actuation of the switching element, but this makes the construction of the adjustment device much more complicated Transmission links are formed merely by simple webs that connect the hub with the wheel rim doa switching wheel

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to form a corresponding curve piece, on which the webs are then along and "on" while the ratchet wheel is running due to the aarial verso displaceable arrangement of the carrier shaft, inevitably move downwards, whereby the adjustment of the switching element into the standby position comes about comes. If a web is then released from the curve piece, the actuating device can come into operation and that Component consisting of ratchet wheel, switching element and carrier shaft jerkily in the opposite direction - /, so dasa the inclined surfaces of the switching elementa one after the other on teeth of the relevant pointer radea and this around

can continue a shift step. The indexing of the pointer wheel in question is thus brought about by a wedge effect, which results when the inclined surfaces are displaced relative to the pointer wheel under the action of the actuating device »,« It is achieved according to the invention that the drive energy for adjusting the pointer wheel is not, as is the case with all of them .bekannten switching means through which the driving ratchet drive device but is provided solely by the actuating device, the advantage .Dadurch "daaa results from the balance a gleiohmäncige Kr" ft nhav try /; \ ng 2; around ratchet wheel is gev / ahrieistst so that dor through eUu :; Sohi ^ v. ··

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member determined seconds when the pointer driving wheel brings at least one amplitude fluctuation with eioh. The BetätigunGSVorrichtang as eolohe can einfaoheter type and example duroh a stationary? Eder, Torsugenelee formed by a leaf spring, Min, ^ dl "*" a 2 * gersapfen the carrier wave attacks. During the adjustment of the holding link in its release position UBg. duroh the control device this spring is then biased and this relaxed calibrated as soon as the cam piece comes free from the corresponding web of the ratchet wheel.

The holding element can be designed differently and according to the invention it is proposed to design it as a screw gear whose teeth have a pitch such as that a contact between its tooth flanks and the flanks of the teeth of the pointer driving wheel, trotsdem it is driven by the ratchet wheel, only takes place when it is transferred to its switching division.

The details mentioned for the adjustment of the holding link can, without leaving the scope of the invention, modified in the area of technical equivalences will. Ea only has to be guaranteed for every solution

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be that the sohalt member to switch the.

Concerning pointer wheel executes necessary relative movement at the right time.

Further features of the invention emerge from the description below with reference to the schematic drawing, all of the exemplary embodiments, which are not meant to be limiting, represent a possible embodiment of the invention. Show it:

Fig.1 is a similar view of a partially shown Movement of a wristwatch, in particular the switching device according to the invention forming parts are illustrated,

Pig.2 shows a longitudinal section through the illustration according to Fig.1, where calibrate designed as a helical gear Switching element is in its ready position,

3 shows a representation according to Pig. 2, but with the Sohalt member remains in its switching position,

4 shows a partial plan view of the arrangement accordingly the fig. 1 to 3.

In the drawing is part of a gear train of a wrist watch movement shown, which is located between an upper throwing

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Plate 10 and a lower work plate 12 is located on which the necessary bridges are arranged. At 14, a · iat a zsige ^ driving gear, such as the seconds wheel of this clockwork, referred iat ds-rotatably arranged on a shaft mounted between the Radbrücken 16 and 18, shaft 20, as indicated in Figure 1 dash-dotted lines is (^, a second hand 22 carries? This second wheel is driven with the aid of a switching device designated as a whole with 24 so that the second hand 22 is advanced abruptly by one stopping step per second. which engages with its teeth 28 in the spaces between the teeth 30 of the second wheel. This screw gear sits on a support shaft 32 which is rotatably mounted with corresponding pins 34 and 36 between the bridges 38 and 40 of the upper and lower work plate is rotatably and immovably arranged on this carrier shaft Carrier shaft 32 is arranged axially displaceably in the bearing points of the briquettes 38 and 40 and a leaf spring 42, which is fastened to the lower work plate 12 and forms an actuating device, tries by acting on the bearing journal 36 of the carrier shaft 32,

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the screw gear 26 in its in Fig.? shown holding position to convict.

In the present embodiment, the drive of the carrier shaft 32 takes place directly by a drive device of a known type, designated as a whole Swinging movement cooperates. The other Ankerarra 56 carries with teeth 58 dea switching or escape wheel 60 cooperating switching pins 62 and 64. The drive of the two-armature 48 is done using a arranged on a roller 66 Schaltatiftea 68, wherein the roll in a known manner to a balance shaft 70 is rotatably arranged, which is set in motion by the balance not shown in detail. The steering wheel can also be driven in another way, for example by means of a further gear wheel.

The desired jump second switching of the seconds wheel 14 or the pointer 22 is now achieved in that the screw gear 26 from its in Pig. 2 , the lower ready position suddenly moves into its in

3 is transferred sohaltatstellung shown. This sleepc < 90 9-8 24/0781 '

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movement that interacts with one as a whole designated by 72 and described further below by the control device acting on the carrier shaft 32 Leaf spring 42 of the actuating device is effected, leads to the fact that the helical gear with the planks which is currently with the ring gear of the secunöenrad 14 in ™ Engaging teeth on the tooth backs of the fourth wheel facing these flanks strikes and that Second wheel moved one second step further. The repatriation of the helical gear 26 in its ready "sohaftsstellung for renewed execution of a second ear of the seconds wheel 14 is effected according to the invention by the control device designated as a whole by 72.

According to the invention, the construction is preferred taken so that the ratchet wheel or escape wheel 60 forms part of the control device 72. The same is with With the help of a hub 74 that holds it on the support shaft 32 and that is connected to the wheel rim 76 of the ratchet wheel 60 is connected by webs 78. That formed by the parts Switching or escapement wheel is assigned a cam piece 80 for axial adjustment of the carrier shaft 32, which at the part carved out of the upper work plate 10

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is molded. The end piece dee Kurvenstttekes check is in a plane which is below the plane index wheel located RECOVERY by the surface of the calibration ¹ according Pig.3 in its scarf test is defined. Ee is the plane in which the surface of the ratchet wheel must be when it is in its ready-to-stick position. This shows that the curved piece 80 reaches through the archers 64 located between the webs 73, provided that this is possible The ratchet wheel is in the locking position. The lower surface of the curve stuoke 60 forms the actual curve surface 86 (e.?ig.2 and 3) # on which, under the action of the leaf spring 42 *, the webs 78, while the brake wheel rotates gradually through the double-armed armature 46 will move along. The webs 78 cooperate in a form-fitting manner with their edge, which lies in a rotational direction and functions as a connecting piece 87, with the curved surface of the curved piece 80. The mode of operation of the control device 72 is now as follows: In order to obtain the second increments of the second wheel 14 to be carried out by the switching device 24, the number of adjustment parts which cause an axial adjustment of the screw gear wheel 26 and which cause the release of the same and which are formed by the webs 78 must be selected so that äass öae screw gear 26 ^ e second a shift step out of his

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Ready position executes in his exhibition. The brake lever must complete one revolution in a number of seconds. The number of display parts formed by webs must correspond to this whole number of seconds. In the present exemplary embodiment, the drive device is designed in such a way that the switching or escape wheel 60 can complete a full revolution in four seconds

executes. The webs 78 must therefore be arranged at such an angular distance from one another that within the four seconds required for the full rotation of the ratchet wheel a four times adjustment of the screw gear takes place, and accordingly the webs 78 are in pairs arranged offset by 90 ° to each other. From FIGS. 1 and 2 shows, for example, how the screw gear 26 is in its lowest, i.e. ready position * It gets into this position because the | Curve piece extending through the archers 84 with its curved surface 86 interacts with the individual webs or adjustment parts 73. Because of the axial adjustable arrangement of the ratchet wheel takes place duroh the

rigid arrangement of the curve part 80 inevitably the Axial displacement of the carrier shaft 82 or the screw gear 26 according to FIGS. 1 and 2 downwards. The adjustment path is preferably 1 to 1 l / 2 times as large as the 60th

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Part of the second wheel circumference selected »This adjustment path comes about through the corresponding curvature or inclination of the surface 86 of the curve piece 80. As soon as that End piece of the curve piece 80 is released from the corresponding web 78 moving under this curve piece, is under the action of the leaf spring 42, the carrier wool or the helical gear in a fraction of a Second (see Hg.l and 2) upwards into its switching division controlled, whereby the second step of the Selcundenrades 14, as already described above, comes about. Here, the curve piece dips into the relevant arc slot 84 of the A ratchet wheel and the following web 78 meets with its anac lag edge 87 on the curved surface 86 of the curved piece on. The screw gear is now in the course of a 90 ° rotation of the switching or escapement wheel 60 back into its Actuation position back controlled so that the can repeat the same sequence of movements. The inclined surface of the switching element interacting with the pointer wheel must be i.e. in the present case the pitch of the teeth of the screw gear must be so great that at the reset, the Sohraubenzahnrades in its readiness teetstellung, during which it rotates, its aioh tooth flanks in mesh with the second wheel

can

do not move the teeth of the pointer wheel / or. allow a movement of the same outside the normal tooth clearance. 8Q9824 / 0781 _1K

Claims (1)

A 34 409 h 7.9.65 - 15 - Pate ntans pruche ι 1. Switching device Bum step-by-step switching of a hand driving wheel of a clock, preferably the seconds wheel, with a switching device that can be driven step-by-step via a holding wheel, which in turn can be driven step-by-step or continuously by a drive device, characterized in that the switching device is one with the Has holding wheel positively connected, with at least one Sohrägfläohe engaging in the teeth of the wheel driving the pointer, axially displaceable holding member, which can be controlled with the aid of a control device into a ready-to-use position from which it depends on the movement of the balance wheel g I by means of an actuating device in a switching » ι Position; Is transferable, whereby during the sohaltgewcgung the Sohaltglledee its inclined surface interacting with the pointer wheel moves the same one step further and the movement of the Sohaltwcgung caused by the Sohaltrades the same can be returned to its driving position without turning the wheel driving the pointer. • 16 - 909824/0781 A 34 409 h y - ta 7/9/65 - 16 - 2 »Switching device according to claim 1, characterized in that that the Sahalt member is designed as a screw gear is. 3. Switching device according to claim 2, thereby gefcennseiohnet, because the screw gear and the ratchet wheel are arranged on a common carrier shaft 4. Switching device according to claim 3, characterized in that that the screw gear is axially displaceable on the carrier shaft ursd directly from the control device is controllable. 5. Switching device according to claim 3 or 4, characterized in that that the carrier shaft forms part of the control device. 6. Switching device according to one of the preceding claims, characterized in that the control device has an adjustment part and transmission members which interact with one another in a form-fitting manner. 7. Switching device according to one of the preceding claims, daduroh marked that the ratchet wheel is a Forms part of the control device. - BAD oniGÜ-JA 909826/0761 -17 * A 34 409 h y - ta 7.9.65 - 17 - 8. Switching device according to one of the preceding claims, characterized in that dasß as an adjusting part A stationary cam piece serves for the control device, which is used for the axial distribution of the carrier shaft interacts with the transmission links provided on the ratchet wheel. 9 »Switching device according to claim 8, characterized in that dasa arranged and distributed in pairs on the ratchet wheel on a circular path and the transmission links are preferably formed by webs that connect the hub and the wheel rim of the switching wheel to one another. Facility 10. switching / according to claim 9, characterized in that that the front in the direction of rotation of the ratchet Edge of the webs serve as a stop of the curve piece a. 11. Switching device according to one of the preceding claims, characterized in that the actuating device is a stationary spring, preferably a Has leaf spring, which preferably engages on a bearing journal of the support shaft and tries to to transfer the carrier shaft to its switching position » 90982A / 0781 ^{BAD cn; c ::} '^{; AL}