A deposit group for depositing a fluid on at least one sheet (1a, 1b, 1c) defining a sliding path of at least one sheet (1a, 1b, 1c) and comprising - a contrast cylinder along which said sheet slides (1a, 1b, 1c); - a laying block suitable to place said fluid on said sheet (1a, 1b, 1c) when said sheet (1a, 1b, 1c) slides on said contrast cylinder - a mover suitable to reciprocally move said laying block and said contrast cylinder defining for said deposit group ∘ a working configuration in which said laying block has a working distance from said contrast cylinder substantially less than the thickness of said sheet (1a, 1b, 1c); and ∘ a maintenance configuration in which said laying block has a maintenance distance from said contrast cylinder greater than said working distance; and - said mover, when said deposit group is in said working configuration, exerts a force to maintain said working configuration, which imposes the maintenance of said working distance; - characterised in that it comprises - a limiter suitable to limit the stroke of said mover defining, for said deposit group, at least one stationary machine configuration in which said laying block is fixed and in stable equilibrium and has a machine stop distance from said contrast cylinder intermediate between said maintenance distance and said working distance; wherein said limiter defines an active position; - and in that - said limiter defines an active position in which said limiter limits the stroke of said mover allowing said deposit group to pass exclusively between said working configuration and said stationary machine configuration and a passive position in which said limiter does not limit the stroke of said mover allowing said deposit group to pass exclusively between said working configuration and said maintenance configuration; and in that it comprises - at least one monitoring station suitable to detect, when said deposit group is in said working configuration, a sliding error of said sheet (1a, 1b, 1c) along said sliding path and to order said limiter to move into said passive position and said mover not to exert said maintenance force. - a contrast cylinder along which said sheet slides (1a, 1b, 1c); - a laying block suitable to place said fluid on said sheet (1a, 1b, 1c) when said sheet (1a, 1b, 1c) slides on said contrast cylinder - a mover suitable to reciprocally move said laying block and said contrast cylinder defining for said deposit group ∘ a working configuration in which said laying block has a working distance from said contrast cylinder substantially less than the thickness of said sheet (1a, 1b, 1c); and ∘ a maintenance configuration in which said laying block has a maintenance distance from said contrast cylinder greater than said working distance; and ∘ a working configuration in which said laying block has a working distance from said contrast cylinder substantially less than the thickness of said sheet (1a, 1b, 1c); and ∘ a maintenance configuration in which said laying block has a maintenance distance from said contrast cylinder greater than said working distance; and - said mover, when said deposit group is in said working configuration, exerts a force to maintain said working configuration, which imposes the maintenance of said working distance; - characterised in that it comprises - a limiter suitable to limit the stroke of said mover defining, for said deposit group, at least one stationary machine configuration in which said laying block is fixed and in stable equilibrium and has a machine stop distance from said contrast cylinder intermediate between said maintenance distance and said working distance; wherein said limiter defines an active position; - and in that - said limiter defines an active position in which said limiter limits the stroke of said mover allowing said deposit group to pass exclusively between said working configuration and said stationary machine configuration and a passive position in which said limiter does not limit the stroke of said mover allowing said deposit group to pass exclusively between said working configuration and said maintenance configuration; and in that it comprises - at least one monitoring station suitable to detect, when said deposit group is in said working configuration, a sliding error of said sheet (1a, 1b, 1c) along said sliding path and to order said limiter to move into said passive position and said mover not to exert said maintenance force.