Islamic calendar
Through the engagement of the large rocker and the day star piece, the design of the Islamic calendar simulation timepiece movement is simplified, the problem of complexity of the locking mechanism in the prior art is solved, and a more concise and reliable Islamic calendar simulation is achieved.
Patent Information
- Application Number
- CN202180038573.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2020-06-03
- Filing Date
- 2021-06-03
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2041-06-03
AI Technical Summary
The design and maintenance of the existing Islamic calendar simulation movement is complex and difficult, especially due to the need for an integrated locking mechanism to handle the plain and prosperous years in the 30-year correction cycle, resulting in more complex construction and maintenance.
The large rocker is used to mesh with the day star piece, and periodic conversion of months and years is achieved by skipping the tooth position, avoiding the incorporation of the locking mechanism and simplifying the movement design.
The movement structure is simplified, the number and complexity of components is reduced, and the accuracy and reliability of Islamic calendar simulations are improved, while reducing maintenance difficulties.
Smart Images
Figure CN115917443B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a mechanical Islamic calendar, in particular for analog timepieces. The present invention more particularly relates to a perpetual Islamic calendar, which can equip the movement of a wristwatch as well as the movement of a clock or pocket watch. Background Art
[0002] The Islamic calendar is a modern lunar calendar that is widely used. This calendar is characterized by a year with 12 lunar months, which is shorter than the solar year. Each Islamic calendar year has about 354 or 355 days, which are 12 months with 29 days and 30 days. The long month has 30 days and the short month has 29 days, so a year starts with a month with 30 days and ends with a month with 29 days or 30 days. In fact, a year in the Islamic calendar lasts slightly more than 354 days. To compensate for this difference, the last month of some years in the 30-year correction cycle has 30 days instead of 29 days. This 30-year cycle includes 19 years with 354 days (called ordinary years) and 11 years with 355 days (called good years).
[0003] EP0606576 granted to the applicant describes an Islamic calendar for an analog watch movement, comprising a 30-position date indicator that advances in steps of one position so as to display the numbers 1, 2 ... 29, 30, 1, 2 ... in succession. The calendar comprises a first mechanism having the function of driving the date indicator from the mobile of the movement by a single step at the end of each day, and a second mechanism meshing with the first mechanism and having the function of driving the date indicator by two consecutive steps at the end of a short month so that it passes from the 29th day to the first day of the next month in a short time interval. The calendar also comprises a third mechanism meshing with the other two mechanisms and having the function of temporarily deactivating the action of the second mechanism at the end of a good year defined by a correction cycle of 30 years, so that the date indicator displays 30 on the last day of the 12th and last month of these years.
[0004] The applicant's WO2015062839 describes an Islamic calendar for a watch movement, which includes a 30-position date indicator that advances in steps of one position so as to continuously display the numbers 1, 2...29, 30, 1, 2... The calendar includes a first date drive mechanism and a second month duration correction mechanism, the first date drive mechanism having the function of driving the date indicator from the wheel of the movement a single step at the end of each day, the second month duration correction mechanism being arranged to engage with the first date drive mechanism so as to drive the date indicator by two consecutive steps at the end of a 29-day month to move it from the 29th day of one month to the 1st day of the next month, the second month duration correction mechanism including a month cam having six protrusions and six recesses, each recess defining a position of the month cam corresponding to a 29-day month, and each protrusion defining a position of the month cam corresponding to a 30-day month. The calendar also includes a third locking mechanism that meshes with the other two mechanisms and has the function of temporarily disabling the effect of the second month duration correction mechanism at the end of the twelfth month of a good year defined by a 30-year correction cycle. The third locking mechanism is arranged to lock the month cam in a position corresponding to a 30-day month in the last month of the good year, so that the date indicator displays 30 on the last day of the twelfth and last month of the good year. Summary of the invention
[0005] The present invention proposes a simplified Islamic calendar which displays the date by observing the alternation of months having 29 days and 30 days in a year and the succession of common years and good years within one of the 30-year correct cycles.
[0006] According to the present invention, an Islamic calendar for a mechanical watch movement comprises: a 30-position date indicator, which advances in steps of one position to continuously and periodically display numbers from 1 to 30, 1, 2... at the end of each day, the date indicator being arranged to be driven by a date drive mechanism and meshing with a large rocker; a month control mechanism, which is arranged to distinguish between months with 29 days and months with 30 days, the month control mechanism comprising a month star, which meshes with a month cam comprising twelve positions; a year control mechanism, which is arranged to distinguish between a good year and a common year, the year control mechanism comprising a year sector, which is arranged to cause a step-length jump of the year star coupled to the year cam, the year cam having flat teeth and having a rest surface on each flat tooth, on which a finger rests in each good year, the finger resting on a hollow portion between two flat teeth to indicate a common year. The Islamic calendar according to the invention is characterized in that the large rocker is arranged to mesh with the day number star during a common year to move two teeth of the day number star forward to go from the 29th day to the 1st day of the next month, the large rocker resting on the month cam.
[0007] Thanks to the invention, the arrangement of a large rocker makes it possible to simplify the movement by avoiding the incorporation of a locking mechanism such as those known in the prior art.
[0008] In fact, in the mechanisms of the prior art, it is necessary to integrate a locking mechanism which must invalidate the action of the mechanism for correcting the duration of the month. For example, a locking lever should be integrated which pivots about an axis and has at one end a contact applied against the year cam and at the other end a locking finger. The locking lever is arranged so that the contact is positioned on the lug of the year cam during a good year and the locking finger abuts against a pin provided on the eleventh lug of the month cam in order to lock and release the month cam and prevent it from pivoting during the twelfth month of a good year and, therefore, in an ordinary year, the locking lever is positioned so that the locking finger does not interfere with the pivoting of the month cam during the twelfth month of an ordinary year.
[0009] Such a mechanism as described in the prior art is functional, but is more complicated to construct and (therefore) maintain.
[0010] In one embodiment, the large rocker is arranged to engage with the finger to cause the day star to skip a tooth to move from the 30th day to the 1st day of the month in a good year.
[0011] According to this same embodiment, the finger is mounted to pivot about an axis and has at one end a slide designed to receive the tip of a large rocker in each year of abundance.
[0012] In one embodiment, the year cam has eleven irregularly distributed flat teeth.
[0013] According to this same embodiment, the year sectors are arranged so that the year star jumps one step each year according to a 30-year cycle. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The characteristics of the invention will become more apparent after reading the description of several embodiments given purely by way of example, without being limited by reference to the schematic diagrams in which:
[0015] - Figure 1 A top view of the Islamic calendar mechanism during a common year is shown;
[0016] - Figure 2 Shown is a top view of the Islamic calendar mechanism during the Year of Plenty;
[0017] - Figure 3 A portion of a watch movement comprising an Islamic calendar mechanism according to the invention is shown;
[0018] - Figure 4 shows a top view of the mechanism indicating on the watch face the presence of a month having a duration of 29 days;
[0019] - Figure 5 shows a top view of a mechanism indicating on the watch face the presence of a month having a duration of 30 days; and
[0020] - Figure 6 A top view of the mechanism is shown indicating the presence of a 30 day month in the last month of the year. DETAILED DESCRIPTION
[0021] like Figure 1As shown, an Islamic calendar for a mechanical watch movement comprises a 30-position date indicator, which advances in steps of one position to continuously and periodically display numbers from 1 to 30, 1, 2... at the end of each day, the date indicator being arranged to be driven by a date drive mechanism and meshing with a large rocker 7. The calendar also comprises a month control mechanism 1, 4, which is arranged to distinguish between months with 29 days and months with 30 days, the month control mechanism comprising a month star 1, which meshes with a month cam 4 comprising twelve positions. The calendar also comprises a year control mechanism, which is arranged to distinguish between good years and ordinary years, the year control mechanism comprising a year sector 10, which is arranged to cause a step-length jump of the year star 5 connected to the year cam 6, the year cam comprising flat teeth 12 and having a rest surface 13 on each flat tooth 12 (see Figure 2 ), a finger 8 rests on the rest surface in each good year, the finger 8 resting on the hollow portion 14 between two flat teeth 12 to indicate an average year.
[0022] During an ordinary year, large rocker 7 is arranged to mesh with day star 9 to move two teeth of day star 9 so as to move from the 29th day to the 1st day of the next month, large rocker 7 resting on month cam 4.
[0023] In this example, month star 1 is positioned on month cam 4 by means of intermediate wheels 2, 3. Year sector 10 causes year star 5 to jump one step per year in a thirty-year cycle. In the 12th month of an ordinary year, finger 8 is positioned in a low position in the recess of year cam 6, outside the reach of tip 7a of large rocker 7. Large rocker 7 causes two teeth of day star 9 to pass in order to go from the 29th day to the 1st day of the following month.
[0024] The day star 9 has twenty-nine flat teeth 17 and one pointed tooth 18 which indicates the transition to a new day cycle in a month.
[0025] like Figure 2 As shown, in a good year, the large rocker 7 is arranged to mesh with the finger 8 so as to cause the day star 9 to skip one tooth to pass from the 30th day to the 1st day of the month.
[0026] The position of the month cam 4 indicates that the year is a good year. In this configuration, the finger 8 is located on top of the year cam 6. The large rocker 7 no longer rests against the month cam 4, but against the finger 8, causing the day star 9 to skip one tooth in order to go from the 30th day to the 1st day of the next month.
[0027] In each of these examples, the year cam 6 has eleven irregularly distributed flat teeth 12 .
[0028] The finger 8 is pivotally mounted about an axis 15 and has at one end a slide 16 arranged to receive the tip 7 b of the large rocker 7 in each year.
[0029] like Figure 4 As shown, the rocker 19 senses the month cam 4 to determine whether the current month is a 29-day or 30-day month based on the twelve positions shown on the month cam.
[0030] To this end, disc 20 indicates to the wearer, through opening 21 of date window 22 , whether the month has a duration of 29 or 30 days, thanks to two different indications, here two different colors.
[0031] Rocking arm 19 is arranged to mesh with a toothing of disk 20 which pivots on the axis of day star 9 and allows the 29 / 30 indication to be displayed through the date window. Rocking arm 19 moves disk 20 from a first position, in which it indicates months with a duration of 29 days, to a second position, in which it indicates months with a duration of 30 days, supported by month cam 4.
[0032] In this example, disc 20 is positioned to indicate a month having a duration of 29 days.
[0033] exist Figure 5 In the example shown, the rocker 19 senses the month cam 4 which is positioned to determine that the current month is a 30 day month.
[0034] Disc 20 is thus positioned to indicate to the wearer through opening 21 of date window 22 that the current month is a 30-day month.
[0035] exist Figure 6 In the example shown, during the last month of the year, it is the finger 8 that positions the rocker 19 to indicate a 30-day month.
[0036] In good years, finger 8 rests on top of year cam 6. Rocker 19 no longer rests on month cam 4, but on finger 8 and allows the 30-day month to be displayed through the date window.
[0037] This calendar may be incorporated into a timepiece such as a wristwatch or a clock.
Claims
1. An Islamic calendar for a mechanical watch movement, the calendar comprising: - a 30-position date indicator that advances in steps of one position to continuously and periodically display the dates from 1 to 30, 1, 2..., the date indicator is arranged to be driven by the date drive mechanism and to engage with the large rocker (7); - a month control mechanism (1, 4) arranged to distinguish between months with 29 days and months with 30 days, comprising a month star (1) meshing with a month cam (4) comprising twelve positions; and - a year control mechanism arranged to distinguish between good years and average years, comprising a year sector (10) arranged to cause a step-length jump of a year star (5) coupled to a year cam (6), the year cam comprising flat teeth (12) and having a rest surface (13) on each flat tooth (12), on which a finger (8) rests in each good year, the finger (8) resting on a hollow portion (14) between two flat teeth (12) to indicate an average year; The large rocker (7) is arranged to mesh with the day star (9) during an ordinary year so as to pass through two teeth of the day star (9) from the 29th day to the 1st day of the next month, the large rocker (7) resting on the month cam (4), Characterized in that a rocker (19) is arranged to mesh with a toothing pivoted on the axis of the day star (9) to move a disc (20) from a first position in which the disc indicates a 29-day month to a second position in which the disc indicates a 30-day month, the rocker (19) resting on the month cam (4), The disc (20) is arranged to indicate by means of two different indications, through an opening (21) in a dial (22), whether the month has a duration of 29 days or 30 days.
2. Calendar according to claim 1, wherein in a good year, the large rocker (7) is arranged to mesh with the finger (8) so as to cause the day star (9) to skip a tooth to pass from the 30th day to the 1st day of the month.
3. A calendar according to claim 1, wherein the year cam (6) has eleven irregularly distributed flat teeth (12).
4. Calendar according to claim 1 or 2, wherein the finger (8) is pivotally mounted about an axis (15) and comprises at one end a slide (16) arranged to receive the tip (7b) of the large rocker (7) in each year of plenty.
5. Calendar according to claim 1 or 2, wherein the year sector (10) is arranged to jump over the year star (5) by one step each year according to a 30-year cycle.
6. A timepiece comprising an Islamic calendar according to any one of claims 1 to 5.
7. A timepiece according to claim 6, in the form of a wristwatch.