EP0529191B1 - Date-indicating device for a timepiece - Google Patents

Description

The invention relates to a date display of a watch, in particular a wristwatch, with a date drive that can be driven by the clockwork, by means of which a single disk can be driven with one step per day and a tens disk with one step per 10 days, evenly distributed in a concentric circle , approximately radially directed on the surface of the one-disc numbers from 0 to 9 or a multiple thereof, with uniformly distributed in a concentric circle, approximately radially arranged on the surface of the tens disc from 1 to 3 and a blank or a multiple Of which, the tens digits and the empty space each have a continuous window corresponding to a digit size in the tens disk, with such an arrangement of the ones disk and the tens disk in such a parallel manner that the ones and tens disk are in an area of a display position cover, in the display position a tens digit and a one digit visible through one of the windows of a two-digit number can be represented, which is visible through a date window of the clock face.

In such known date displays (CH-A-31 64 61), the one and ten disks designed as solid disks overlap with their peripheral areas in the display position. This has the disadvantage that an arrangement of the display position in the edge area of the dial is not possible and thus the display area is often covered by hands of other displays of the clock.

Free choice of the arrangement of the display position is also considerably restricted.

Another disadvantage is that the extension of the disc arrangement is relatively large and thus requires a large amount of space. An arrangement of other displays with implementation of their drive axles to their drive mechanisms is also prevented in this area.

From CH-A-32 42 70 a date display of a watch is known which has a single disk designed as a disk ring and a tens disk arranged radially within the disk ring of the single disk in the same plane. The ones digits of the ones disk and the tens digits of the tens disk are arranged tangentially directed on the disks.

In order to enable a relatively large representation of the date, the one and ten disks must also be large, the size of which is limited by the size of the watch case. In addition, only an arrangement of the display position in the three o'clock area of the dial is possible.

Furthermore, from DE-C-46 31 19 and FR-A-22 40 474 date displays of clocks are known, which are arranged concentrically next to each other and have a disk ring of a single disk and a disk ring of a tens disk with tangentially directed digits. To display the date in large format, these also require large ring disks, the maximum size of which is limited by the watch case. The display position can only be in the three o'clock area of the dial.

From CH-A-66 09 41 a date display is known which, in order to avoid an excessively large diameter, has two disc rings arranged one above the other, of which the upper disc ring is tangentially aligned with the numbers 17 to 31 and the disc ring arranged below it, also tangentially aligned with the numbers 1 to 16 carries. Between the numbers 17 and 31, the upper number ring has a window through which the numbers of the lower disc ring are visible. After a complete revolution of the lower disc ring during which the upper disc ring stops, the upper disc ring is driven and the lower disc ring stops.

Due to the large number of numbers, these cannot be displayed in large numbers.

In addition, the display position can only be arranged in the three o'clock area of the dial.

It is therefore an object of the invention to provide a date display of the type mentioned at the outset which, when displaying relatively large digits, enables a largely free choice of the arrangement of the display position and requires a small installation space.

This object is achieved in that the axis of rotation and the outer circumferential contour of the disc of smaller diameter of tens or

One's disk is at least largely arranged within the outer circumferential contour of a disk of larger diameter, that the disk of larger diameter is designed as a disk ring and that the outer circumferential contours of the one disk and tens disk touch approximately. This design enables the disks to be provided with relatively large numbers so that the date can be easily read. In addition, the display position can be placed in the peripheral edge area of the disc ring. Since no components of the date display protrude beyond its outer circumferential contour, the display position is thus largely free, but can also be arranged in the edge area of the dial.

The drive shaft of the smaller-diameter disk and, if appropriate, the drive shafts of further displays of the clock can also be passed through the disk ring bore of the disk ring without any problems.

In addition, if the date drive is arranged radially within the circumferential contour of the disk ring bore, the installation space required is particularly small.

It leads to a flat design of the date drive if the disk ring designed as a single disk is provided on the circumferential contour of the disk ring bore with an internal toothed ring, in which a drive pinion of the date drive engages.

The drive pinion can be shifted from a single program wheel with one step per day via an intermediate wheel, with a step-by-step break of one step after thirty steps the unit disc is advanced thirty times before the number 1 of the unit disc appears in the display position on the thirty-first of a month. Then there is a pause in progress from one step, since on the following day the number 1 should be displayed again for the first day of the next month. With this design, one can dispense with a double arrangement of the number 1 on the unit disk and be satisfied with the simple arrangement of the number 1. This either reduces the size of the disc ring or enables the digits to be displayed even larger.

The disk of smaller diameter, designed as a tens disc, can be incremented by a tens program wheel by means of a pinion that is connected to it in a rotationally fixed manner, with an increment pause of eight steps after a first increment, after a second increment an increment pause of nine increments, after a third increment If there is a pause of nine steps and after a fourth step, there is a pause of one step, the number plate is moved into the display position with the empty space after the representation of the number 3, while the number 1 is shown by the unit disc. After a further eight indexing pauses, the tens disc is displayed to display the ten. After a further nine indexing pauses, the index is advanced to twenty and after the following nine indexing pauses to thirty. After that, only one indexing pause is required, in which the unit's disc from the thirtieth on the thirty-first advances before the cycle starts again.

In order for the tens to be positioned exactly in the intended rest position after advancing, the pinion can be locked in a rest position between two steps by a tens key which resiliently engages its teeth.

A small space requirement is achieved in that the single program wheel and the tens program wheel are connected in a rotationally fixed manner to a program drive wheel which can be indexed one step per day by an intermediate wheel. To position the program drive wheel after advancing exactly in the intended rest position, the program drive wheel can be locked in a rest position between two steps by means of a catch that resiliently engages its teeth.

The date drive is driven by the clockwork in a simple manner in that the intermediate wheel can be driven by a gear wheel of the clockwork of the clock.

In order to achieve the required large reduction and an engagement of the idler gear in the program drive gear for advancing with little effort, the idler gear can be rotatably driven at one revolution per day and have a protruding indexing pin which meshes with the program drive gear. This means that the date drive is decoupled from the clockwork outside of an indexing process.

If the program drive wheel can be incrementally advanced by means of a manually actuatable ratchet, then a manual incremental bridging to the actual date can be carried out in a simple and quick manner for a month with thirty or fewer days.

In order to position the ones exactly after the indexing in the intended rest position, the intermediate wheel can be locked in a rest position between two steps by a one-way catch resiliently engaging in its teeth.

The same advantages as with the above. The object is alternatively achieved in that the single disk and tens disk have approximately the same diameter, are arranged coaxially to one another and both disks are designed as disk rings.

Fig. 1

eine Draufsicht einer Datumsanzeige,

Fig. 2

ein Ziffernblatt einer Uhr mit einer Datumsanzeige nach Fig. 1,

Fig. 3

Einerprogrammrad, Zehnerprogrammrad und Programmantriebsrad der Datumsanzeige nach Figur 1 in perspektivischer Explosionsdarstellung,

Fig. 4

eine Seitenansicht der Datumsanzeige nach Fig. 1,

Fig. 5

eine Draufsicht der Einheit Programmantriebsrad, Raste und Schaltklinke der Datumsanzeige nach Figur 1,

Fig. 6

ein zweites Ausführungsbeispiel von Einerscheibe und Zehnerscheibe in perspektivischer Explosionsdarstellung,

Figur 7

ein zweites Ausführungsbeispiel eines Ziffernblatts einer Uhr mit einer Datumsanzeige nach Figur 1,

Figur 8

die Datumsanzeige der Uhr nach Figur 7 in der Draufsicht.

Embodiments of the invention are shown in the drawing and are described in more detail below. Show it:

Fig. 1

a top view of a date display,

Fig. 2

a dial of a clock with a date display according to Fig. 1,

Fig. 3

A program wheel, tens program wheel and program drive wheel of the date display according to FIG. 1 in a perspective exploded view,

Fig. 4

2 shows a side view of the date display according to FIG. 1,

Fig. 5

2 shows a plan view of the program drive wheel, catch and pawl of the date display according to FIG. 1,

Fig. 6

2 shows a second exemplary embodiment of the unit disk and tens disk in a perspective exploded view,

Figure 7

2 shows a second exemplary embodiment of a clock face with a date display according to FIG. 1,

Figure 8

the date display of the clock according to Figure 7 in plan view.

The date display shown in the figures has a single disk 1 designed as a disk ring, on the surface of which is directed approximately radially inwards, evenly on a concentric circle in the peripheral area the numbers 0 to 9 e.g. are arranged by printing. Within the outer circumferential contour 2, a tens disk 3 is arranged in a parallel plane above the rotatably mounted single disk 1 so as to be rotatable about an axis of rotation 4. The tens disk 3 is arranged eccentrically to the ones disk that the revolving contours 2 and 5 of the ones disk 1 and the tens disk 3 touch at one point. The tens disk 3 is provided on its surface facing away from the ones disk 1 with approximately radially inward, uniformly on a concentric circle in the peripheral area with the numbers 1 to 3 and an empty space 6.

In a display position in which the tens digit 3 and the ones digit 0 are located in FIG. 1, the illustrated digits of the two disks 1 and 3 are positioned parallel to one another in such a way that they show a two-digit number or a ones number with a space 6 in front of them.

Thus the one digit assigned to the respective tens digit for an observer in parallel directly are visible next to each other, the tens disc 3 is formed between the adjacent digits or between adjacent digits and empty space 6 with continuous windows 7 larger area than the area occupied by the ones digits. This gives the tens disk 3 an approximately cross-like shape.

A date drive 9 is arranged radially within the circumferential contour of the disk ring bore 8. This is driven by a gear wheel 10 of the clockwork, not shown, of the clock, the pointer tube 11, on which the gear wheel 10 is arranged, leading through the disk ring bore 8.

An intermediate wheel 12 is driven by the gear wheel 10 at one revolution per 24 hours. The intermediate wheel 12 is provided with an indexing pin 13 projecting axially from its plane, which engages once in 24 hours on a tooth of a program drive wheel 14 provided with 31 teeth and advances it by one tooth. The program drive wheel 14 thus rotates step by step with one revolution in 31 days.

A single program wheel 15 and a tens program wheel 16 are connected coaxially and in a sandwich-like manner to the program drive wheel 14. Both the single program wheel 15 and the ten program wheel 16 are provided with a tooth pitch of 62 teeth.

From the unit program wheel 15, an intermediate wheel 17 with six teeth is rotatably drivable, which is coaxial with a drive pinion 18 of larger diameter designed as a link wheel is connected in a rotationally fixed manner.

This drive pinion 18, which is likewise formed with six teeth, engages in an internal ring gear 19 with 20 teeth, which is formed on the circumferential contour of the disk ring bore 8. The single disk 1 is thus driven step by step at three revolutions per month.

So that when moving from the thirty-first of a month to the first of the next month, the tens disc 3 with its empty space 6 is moved into the display position, but the 1 of the ones disc 1 that is already in this display position remains there, the ones program wheel 15 is at the appropriate point a tooth gap 20 provided by two teeth. This creates a pause in advancement of one step.

From the tens program wheel 16, a pinion 21 with eight teeth can be advanced at one revolution per month, which is connected to the tens disk 3 in a rotationally fixed manner via an axis 22. The axis 22 is guided through the disk ring bore 8.

The tens program wheel 16 is provided with a tooth pitch of 62 teeth, but actually has only four teeth, as can be clearly seen in FIG. 3. Between a first tooth 23 and a second tooth 24 there is a first tooth gap 25 of sixteen teeth, which causes a first indexing pause of 8 steps.

Between the second tooth 24 and the third tooth 26 and between the third tooth 26 and the fourth tooth 27 there are a second and a third tooth gap 28 and 29 of 18 teeth each, which cause a second and a third indexing pause of nine steps each.

A fourth tooth gap 30 is formed between the fourth tooth 27 and the first tooth 23, which causes a fourth indexing pause of one step. Thus, teeth 23, 24, 26 and 27 cause the dial 10 to advance only from the ninth to the tenth day, from the nineteenth to the twentieth day, from the twenty-ninth to the thirtieth day and from the thirty-first to the first day of a month.

So that the one pulley 1 and the ten pulley 3 are held exactly in their rest position after a step forward, a one-way catch 31 engages in the intermediate wheel 17 and a ten-way catch 32 resiliently engages in the pinion 21.

In the same way, the program drive wheel 14 is held in its rest position by a catch 45.

As shown in Fig. 5, the program drive wheel 14 is further movable by a pawl 33 in the advancing direction. For this purpose, the pawl 33 has a two-armed lever which can be pivoted about a pivot axis 34, on one lever arm of which a switching tooth 35 is arranged and the other lever arm of which can be actuated manually against the force of a spring 36. The shift tooth 35 held in the rest position by the spring out of engagement by the program drive wheel 14 is engaged by manual actuation and pivoting of the pawl 33 into the ...

The teeth of the program drive wheel 14 brought and switches this by one tooth distance per actuation stroke. This means that the date display can be updated after months with less than thirty-one days.

In the case of the dial 37 shown in FIG. 2, a date window 38 is formed in the edge area, through which the digits of the one and ten disks 3 are shown in large format.

In the exemplary embodiment shown in FIG. 6, not only the one disk 1 but also the tens disk 3 'is designed as a disk ring. The one and ten disks 3 'have approximately the same diameter and are arranged coaxially to one another.

In the same way as for the single disk 1, the circumferential contour of the disk ring bore 39 of the tens disk 3 'is provided with a toothing for driving the tens disk 3'. This embodiment is also an embodiment of the inventive concept.

Figures 7 and 8 show that a date display, as shown in Figure 1, can be installed with a small footprint even with clocks with a wide variety of display scales. The dial 40 shown in FIG. 7 has, in addition to the date window 51, a power reserve display 42, a time display 43 for hours and minutes and a separate second display 44.

Claims (13)

1. Date indicator for a clock, in particular a wrist watch, comprising a date drive, which is driven by the watch movement and by means of which a digit disc is continuously advanced by one step per day and a decimal disc by one step every ten days, with digit numbers from 0 to 9 or in multiples thereof evenly spaced in a concentric circle and approximately radially oriented on the surface of a digit disc, with decimal numbers from 1 to 3 as well as a blank position or multiples thereof spaced in a concentric circle and approximately radially oriented on the surface of a digital disc, and with a continuous window to correspond with the size of a figure dimension arranged in the digital disc between the decimal figures as well as the blank position, with an arrangement of digit disc and decimal disc positioned parallel alongside each other in such a manner that digit disc and decimal disc overlap in an area of an indicating position, and in the indicating position a two digit number, which is displayed through a date window of the watch face, is illustrated by a decimal figure and a digit figure which are visible through one of the windows, characterized in that the rotary axis (4) and the outer peripheral contour (5) of the disc of smaller diameter of decimal or digital disc is at least substantially arranged within the outer peripheral contour (2) of the disc of larger diameter, that the disc of larger diameter is designed as a circular disc, and that the outer peripheral contours (2, 5) of digit disc (1) and decimal disc (3) almost touch each other.
2. Date indicator according to Claim 1, characterized in that the date drive (9) is arranged radially within the peripheral contour of the circular disc bore (8).
3. Date indicator according to one of the above claims, characterized in that the circular disc arranged as a digit disc (1) is at the peripheral contour of the circular disc bore (8) provided with an inner toothed rim (19) which is engaged by the drive pinion (18) of the date drive (9).
4. Date indicator according to Claim 3, characterized in that the drive pinion (18) is advanced via an intermediate wheel (17) by a digit programme wheel (15) by one step per day, and after an advance of thirty steps, the advance is paused by one step.
5. Date indicator according to Claim 4, characterized in that the disc of smaller diameter designed as a decimal disc (3, 3') is advanced via a pinion (21), which is non-rotationally connected to it, by a decimal programme wheel (16) by one step per day, and after a first advance the advance is paused by 8 steps, after a second advance the advance is paused by nine steps, after a third advance the advance is paused by nine steps, and after a fourth advance the advance is paused by one step.
6. Date indicator according to Figure 5, characterized in that the pinion (21) is arrested in an inoperative position between two steps by a decimal notch (32) which resiliently engages its toothing.
7. Date indicator according to one of the above claims, characterized in that digit programme wheel (15) and decimal programme wheel (16) are non-rotationally connected to a programme drive wheel (14) which is advanced by an intermediate wheel (12) by one step per day.
8. Date indicator according to Claim 7, characterized in that the programme drive wheel (14) is arrested in an inoperative position between two steps by a notch (45) which resiliently engages its toothing.
9. Date indicator according to Claim 7, characterized in that the intermediate wheel (12) is driven by a gearing wheel (10) of the clock movement.
10. Date indicator according to Claim 7, characterized in that the intermediate wheel (12) is driven by one rotation per day and comprises a protruding advance pin (13) which meshes with the programme drive wheel (14).
11. Date indicator according to Claim 7, characterized in that the programme drive wheel (14) is advanced step by step by a manually operated control pawl (34).
12. Date indicator according to Claim 4, characterized in that the intermediate wheel (17) is arrested in an inoperative position between two steps by a digit notch (31) which resiliently engages its toothing.
13. Date indicator according to the concept of Claim 1, characterized in that digit disc (1) and decimal disc (3') are of approximately identical diameter, arranged coaxially to each other, and both discs are structured as circular discs.

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