Abstract: In positioning of a glass sheet relative to cambering and/or other heat treatment tools during a treatment, the glass sheet (2) heated to beyond its softening point travels flat on a conveyor (3) before being stopped beneath a generally shaping upper element (8) against which it is applied and is then released onto a lower element (10) by which shaping optionally continues and/or the glass sheet is transferred to another device, particularly a cooling device by thermal tempering. The position of the glass sheet (2) relative to the upper element (8) and/or the position of the upper element (8) relative to the lower element (10) are controlled by members integral with the upper element (8).