DE19539087A1 - Wrist watch with two mechanical circular data indication discs and dial face - Google Patents

Abstract

The wristwatch contains two circular discs, arranged so that 31 days of a month are arranged with equal spacing around the circumference of the two discs, and at the same distance to their centre points. These numbers are indicated successively in an ascending sequence. The two discs (3, 5) are arranged centrally one over the other, under the dial face (1) provided with a window (2), rotatable about the common centre point. The lower disc (5) carries the numbers 1 to 16 in a 22.5 deg. spacing, and on the top disc (3), near the figures (17-31) a cut out in the circumference, also found in the 22.5 deg. spacing. The figures of both discs as well as the cut out, are so arranged, that they at least once in 31 days are positioned coinciding with the window. The common circuit in this case, is the jump of the lower disc from the "16" on to the "1", and the top disc from the cut out on to the "17".

Description

In addition to the information about the time, the date is probably the second most important display of a Wrist watch. The complication of a date display is usually constructive as follows solved:

• 1. A circular disc with 31 digits advances one position at midnight; the new The date can be seen in a window on the clock face.
• 2. The 31 days of a month are on the dial z. B. arranged as an outer circle. On Extra hands jump one position every day at midnight.
• 3. On the large dial there is a small auxiliary dial arranged eccentrically (often in combination with other functions such as moon phase) also with 31 days.

Often, due to the tightness, only every second day is advertised. A little extra pointer jumps one position once every 24 hours.

The disadvantage of all these solutions is the poor readability, especially for customers who are farsighted. For this reason, it is often found above the date display in the watch glass a small magnifying glass.

For this reason, small and especially small rectangular wristwatches cannot a window date display.

A large date display is also known, in which the 31 digits with the help of 2 disks in be displayed in a double window. The unit disk is designed as a ring and has the digits from 0 to 9 on the outer diameter. The tens disc has 4 Segments (numbers 1-3 and an empty field), and partially covers the unit disk. The Drive mechanics is relatively complicated because the "3" of the tens disc is only for 2 days Display may come and the "1" of the unit's disc at the transition from the end to the beginning once a month may not be further clocked. This type of date display ensures good readability, but is very complicated and space-consuming.

The invention has for its object to provide a large date display that is easy to manufacture to represent low space requirements.  

This object is achieved in a wristwatch by the features of Claim 1 solved. Advantageous further developments can be found in the subclaims.

The invention of a large date display with minimal design effort is explained in more detail below with reference to FIG. 1:

Instead of a date disc with 31 digits at an equidistant spacing on the circumference, 2 circular discs ( 3 ) and ( 5 ) arranged one above the other under the dial ( 1 ) of the wristwatch with a window ( 2 ) are used. Of these, a circular disc ( 5 ) carries the digits from 1 to 16 in a circumferential direction in a 22.5 ° division in increasing order and the disc ( 3 ) above them carries the digits from 17 to 31 in the same division and the same distance from the center as in the lower pane. In addition to the digits from 17 to 31, the upper pane has a recess ( 4 ) on the circumference with a width of at least 22.5 °, at the same distance from the center of the pane as the digits and is therefore approximately the same area as the window ( 2 ). For the first of the month, the "1" of the lower disc ( 5 ) is in the recess ( 4 ) of the upper disc, which is at rest for the next 15 cycles. After the "16" is displayed, the lower disc jumps back to "1" (16th cycle) and at the same time the upper disc to "17" (1st cycle of the upper disc). From now on, the lower disc is at rest for the next 15 operations. At the end of the 15th day of the rest period of the lower disc (ie at the end of the 31st of the month), the upper disc jumps back to the "recess" position (16th cycle of the upper disc), which automatically restores the "1" of the lower disc Disk appears in the window. From now on, the upper disc is at rest for 16 days (15 cycles) etc.

The arrangement can also be operated inversely. Then the upper disc is next to the Cut out the digits from 1 to 15 and the lower disc the digits from 16 to 31. It comes to a joint action if at the end of the month the lower disc of the "31" jumps to the "16" and at the same time the upper one from the "recess" to the "1".

The advantage of these constructive arrangements is a doubling of the size of the display coming digits and thus a significant improvement in readability with "at a glance".

So there are possibilities

• - for normal sized wristwatches with window date display by quadrupling the Ad space to improve the readability of the digits,
• - Small, especially rectangular wristwatches with a date display provided and
• - A window date display with eccentric to the hour and minute waves realize arranged date discs.

Claims (5)

1. Wristwatch with mechanical date display, characterized in that it contains 2 circular disks ( 3 , 5 ), and that the 31 days of a month are arranged at equidistant intervals in a ring on the circumference of the 2 circular disks at the same distance from the center points and one after the other increasing order can be displayed. 2. Wristwatch according to claim 1, characterized in that the circular disks ( 3 , 5 ) zen trically one above the other under a window ( 2 ) provided dial ( 1 ) are rotatably arranged about the common center. 3. Wristwatch according to one of claims 1 and 2, characterized in that the lower disc ( 5 ) bears the numbers from 1 to 16 in a 22.5 ° division and on the upper disc ( 3 ) next to the numbers of 17th to 31 there is a recess (circular section) in the circumference, also in a 22.5 ° division, and that the digits of both circular disks and the recess are arranged so that they are positioned at the same area with the window at least once in 31 days. The common circuit in this case is the jump of the lower disc from "16" to "1" and the upper disc from the "recess" to "17". 4. Wristwatch according to one of claims 1 and 2, characterized in that the lower disc ( 5 ) bears the numbers from 16 to 31 and on the upper disc ( 3 ) next to the numbers from 1 to 15 a recess (circular section) in Circumference. The digits of both circular disks and the recess are arranged so that they are positioned at the same time with the window ( 2 ) at least once every 31 days. The common circuit in this case is the jump of the upper disc from the "recess" to "1" and the lower disc from "31" to "16". 5. A method of operating a wristwatch with a large date display according to one or more of claims 1 to 4, characterized in that it contains 2 circular disks ( 3 , 5 ) which are driven in a 24-hour rhythm so that one disk switches 15 times while the other disc is at rest, the two discs are then clocked together and then the first disc is at rest for 15 switching operations, etc.