Lange 1 Large Calendar Watch
Ten place plate and unit ring combination
Everyone who has seen this large calendar mechanical watch will be deeply impressed. Lange’s biggest innovation is that it reduces the area of the movement occupied by the large calendar mechanism to a minimum, so that it can be placed in a small size movement. According to the structure diagram of the Lange large calendar, we can see that its structure is not very complicated. The big calendar displays a ten-digit disk shaped like a cross. It has three numbers 1, 2, and 3 printed on it. , And together with another one-digit ring printed with ten digits from 0 to 9 make up the calendar display.
Maybe a friend will ask at this time: ‘How exactly do they complete the process from 1st to 31st of each month and then to the 1st of next month?’ & rdquo; Of course, I will explain to you here first, the big calendar we talked about in this issue is an ordinary calendar display system, and its cyclic transformation can only be as described earlier. If it can automatically identify big and small months and even leap years and leap months, it is the perpetual calendar display system. I will focus on explaining it in future articles.
Let’s continue with the topic just now. The conversion of this large calendar first requires the input of power through the time wheel of the mechanical watch movement. The time wheel is a part that everyone will not be unfamiliar with. Its rotation speed is one week every twelve hours, and then it will drive a day-changing wheel that rotates once every twenty-four hours, and a body is also set on it. Dial for turning the day wheel. This dial will move the date-changing wheel with 31 teeth that engages with it. Every day, one tooth of the date-changing wheel will be dialed, and the date-changing wheel rotates once, which is equivalent to the completion of a full month. .
At this time, everyone may ask again, how are the two different parts printed with numbers combined to change the calendar display together? This key point lies in the body of the day-changing wheel: in fact, it is a collection of three-layer gears. One of the two gears above will mesh with the gears under the ten-digit plate with the number printed, and the other will The internal teeth of the unit ring engage. Then, how many teeth are needed to drive the ten-position wheel and the number of teeth of the one-position wheel? We can now count 31 days in a month. If we think of ten days as a group, it will be three groups of ten days, 1 to 10, 11 to 20, 20 to 30, plus the day 31. However, the place dial is ten numbers from 0 to 9, and it is responsible for displaying the nine numbers from 1 to 9 in these three groups. In other words, the combination with the ten-digit plate should be 1 to 9, 11 to 19, 21 to 29. The setting of the number 0 on the single-bit ring is specifically used for the conversion of these three groups of numbers, that is, the interval numbers 10, 20, 30 between them. In addition, the ten-digit disk will also convert its numbers simultaneously The space is converted into 1, 2, and 3.
According to this law, we can conclude that the number of teeth for the ten-digit wheel responsible for driving the ten-digit disk should be at least two before the three numbers can be converted. According to the previous statistics, the number of teeth of the unit wheel driven by the unit ring is at least 28. At this time, what you need to pay attention to is that the calendar changes from 29 to 31 through the two numbers 30 and 31. The number is from 9 to 1, and the number on the ten-position plate is from 2 to 3. Then, another bit wheel needs to add two more teeth to reach 30, and a ten bit wheel needs to add one tooth to reach 3. Of course, the most important step is not to be ignored: due to the change of the month, the number jumps from 31 to 1 again. At this time, the movement of the ten-digit plate and the unit ring is: the ten-digit plate changes from 3 to blank, and the single-digit plate does not move. At this point, the basic transformation of the Lange Large Calendar is complete. Changing the position wheel should be 31 full teeth and 1 missing, while the corresponding one for the ten position wheel is to set 1 tooth every 9 pitches, plus a total of 4 teeth. At this point, you can complete the original design idea of this big calendar mechanism. I don’t know if you have understood the display principle of the Lange big calendar.