Second Precision & Constant Jump Second Richard Lange Jumping Seconds Technical Information Supplement

Precision in seconds
Recently, the first batch of Richard Lange Jumping Seconds platinum 950 watches have been delivered to Lange global stores and retailers. This model was launched at the 2016 Geneva Watch Fair and is limited to a total of 100 pieces. Lange re-interprets the fascinating scientific astronomical watch with the classic hour-clock dial, seconds jumping device, constant power escapement system and zeroing device.

Lange pocket watch with seconde morte device and RICHARD LANGE JUMPING SECONDS
For ten years, Richard Lange has represented a growing watch collection. The Richard Lange series appropriately changes the traditional scientific observatory of Lange to make it keep pace with the times. It is named after the eldest son of Ferdinand Adolph Lange and pays special tribute. Born in 1845, Richard Lange inherited his father’s business and transformed the latest observations in contemporary physics, chemistry, and mathematics into many innovative technologies. All the patents obtained by him can be reflected in the pocket watches carefully made by the watch factory.
Richard Lange Jumping Seconds was launched in January 2016, adding a watch with the Lange classic pocket watch function to the collection. The newly developed L094.1 self-made movement is equipped with the seconds jumping complication (aka seconde morte) and is equipped with Lange’s patented constant-power escapement. This device uses the switching power of the seconds jumping device in the gear train to provide new energy for the permanent spring of the constant power escapement. In a separate gear train between the barrel and the escapement, a constant power unit compensates for the dwindling energy of the spring. This allows the watch to maintain constant torque and stable amplitude during a power reserve of up to 42 hours.
The reset device allows the watch to quickly and smoothly synchronize with the time signal. The silver-gray chronograph dial features a striking second ring on the top, lined with a platinum 950 case with a diameter of 39.9 millimeters. There is a small window at the intersection of the clock circle and the second circle, which is displayed in red ten hours before the power of the watch is exhausted, reminding the wearer to wind the watch.
The inside of the movement is carefully modified by hand to meet the strictest Lange standards, while the wearer can watch the movement through the sapphire crystal back cover. The five-pointed star-shaped part is responsible for controlling the jumping seconds device, which is placed under the transparent sapphire bearing and runs among the mirror-finished end parts. In addition, the hollow part of the 3/4 plywood can also allow the wearer to watch the permanent spring of the constant power escapement, and the lever, hairspring and clutch of the zero reset device are also clearly visible.
Constant jump seconds
Under Richard Lange Jumping Seconds’ simple and flawless chronograph dial, three major technical features are hidden: the seconds jumping device that makes the watch famous, a constant-power escapement system that ensures stable power, and a zeroing device for resetting the second hand . Understanding these three characteristics provides a basis for a deeper understanding of the structure of the Lange L094.1 self-made movement.

RICHARD LANGE JUMPING SECONDS and Lange pocket watch with seconde morte device
Jumping seconds device
The seconds jumping device has been a tradition of Lange for almost 150 years. In 1867, Ferdinand Adolph Lange, a pioneer of Saxony watchmaking, created pocket watches with a seconde morte device. The pocket watch has a large sweep seconds hand that clearly divides a minute into 60 steps. The second hand can be started and stopped, but it cannot be reset to zero. The son of Ferdinando Adolf Lange, Richard and Amy, innovated the system and patented their device mounted on a 3/4 splint in 1877, entitled ‘Second Movement with Jumping Second Device’ ‘.
Richard Lange Jumping Seconds, launched in January 2016, has a similar operating principle to the original: in this long-established device, the jump seconds are controlled by a jerky long lever and star gear, which converts the amplitude of the balance 6 times per second into The second hand jumps forward by one tick.

Modern jumping seconds
A star gear running under a transparent ruby ​​bearing is connected to the escapement mandrel and rotates along the axis with the escape wheel every five seconds. Every second, a corner of the star gear loosens the tightened lever, creating what the watchmaker refers to as a ‘jump.’ The lever rotates 360 degrees instantly and is stopped by the next corner of the star gear. This series of actions makes the second hand move exactly one space.

Lange’s own L094.1 movement
Constant power escapement
The mainspring has a large initial torque but a weak torque at the end. However, Lange has been relentlessly searching for a solution to this difference. Lange has developed four different constant power transmission systems, including the sesame chain transmission system, which was introduced in 1994, and three different constant power escapements.
The constant power escapement in Lange 31 maintains the same torque every ten seconds for 31 days; Zeitwerk uses a powerful mainspring to advance the digital disk instantly every minute; and constant power in Richard Lange Jumping Seconds The escapement system device performs two major functions: to compensate for the gradual weakening of the mainspring barrel, and to prevent the amplitude from decreasing when jumping seconds. This device uses the switching power of the jumping seconds device in the wheel train to provide new energy for the permanent spring of the constant power escapement, which can be enjoyed through the window of the wheel bridge. In a separate gear train between the barrel and the escapement, the constant-power escapement compensates for the gradually decreasing energy of the spring. The constant spring of the constant power device gives the escapement a constant torque, thus ensuring that the watch has a stable amplitude during the 42-hour power reserve. The free-swinging hairspring is made by Lange Watch Factory, like the permanent-moving hairspring. It co-ordinates with the cam fixed balance wheel to ensure stable speed.
Zeroing device
The return-to-zero device was first assembled in the Sax-0-Mat movement in 1997. It is now improved and is mounted in Richard Lange Jumping Seconds. It is equipped with a clutch consisting of multiple discs. Its function is to use a high moment of inertia to stabilize the operation of the large second hand, especially in the sudden start and stop phase when jumping seconds. The clutch also separates the wheel train when the reset second hand returns to zero.

After the crown is pulled up, the complex lever system starts three programs in an instant: the stop spring is gently pressed against the balance wheel to fix it, and the clutch disc is separated by the clamp lever to separate the connection between the second hand and the train.
Reset the hammer to the heart-shaped cam to advance it and the second hand to the zero second position. When the crown is pushed back to its original position, the second hand is reconnected to the wheel train, and the balance wheel is unfastened and re-swings immediately.