Installation for performing operations of shaping glass or crystal pieces

Installation for uncapping glass or crystal pieces, comprising

• at least one drive wheel and at least one return wheel,
• a support element driven in circulation by the said at least one drive wheel so as to pass around the said at least one return wheel and the said at least one drive wheel,
• main chucks in a predetermined number that are supported by the support element and that, in the active position, each hold a glass or crystal piece by a first end thereof, and
• work stations situated along the support element in circulation, which perform the uncapping operations on the said glass or crystal pieces,
• at least one wheel among the said at least one drive wheel and the said at least one return wheel being a carousel that comprises secondary chucks fewer in number than the predetermined number of main chucks and that cooperates, in a cooperation zone, with the moving support element, each secondary chuck being, in this cooperation zone arranged in opposition to a main chuck on a common axis (23) and, in the active position holding a glass or crystal piece (21) by a second end thereof, opposite to the first, the main chucks being mounted on the support element and the secondary chucks on each carousel so as to allow, in the said cooperation zone, a relative movement between the opposite chucks along their common axis, between a distant position and a close position and vice versa, also in their active position, the main chucks and the secondary chucks arranged in opposition being mounted so as to be driven in rotation synchronously about their common axis in their active position.