Abstract: The invention relates to a one-piece hairspring (21, 21?) including, a balance spring (25, 25?) coaxially mounted on a collet (27, 27?), made in the same layer of silicon-based material. According to the invention, the hairspring includes an elevation device (2, 2?) for the outer coil of the balance spring above the layer of silicon-based material so as to improve the concentric development of the hairspring. The invention also relates to a timepiece including a hairspring of this type and the method of manufacturing the same. The invention concerns the field of timepiece movements.

Abstract: A spring-forming control system and its control method for a spring forming machine in which the spring-forming control system uses a host computer to provide graphical spring parameter setting, program modification, and dragline-method program modification graphical interfaces that are selectively switchable on a display monitor. After setting of spring processing parameters through the spring parameter setting interface, a trial production is done subject to a spring parameter auto-generation software built in the spring-forming control system, and then the production is started if the trial meets the requirements, or the spring processing parameters are modified through the spring parameter setting interface, program modification interface, or dragline-method program modification interface if the trial does not meet the requirements, and then a further trial production is performed till the shaped spring meets the requirements.