Clutch for torque transmission between a shaft and a roller which is arranged coaxially around the shaft

Clutch (20) for transmitting torque between a shaft (2) and a roller (30) arranged coaxially around the shaft (2), comprising pneumatically actuatable means for selectively interrupting or producing a force flow between the shaft (2) and roller (30), characterized in that the clutch (20) is arranged inside the roller (30) coaxially between the shaft (2) and roller (30), and wherein the pneumatically actuatable means comprises a pneumatic cylinder (3) with a piston (11) movable therein, the pneumatic cylinder being rotatably mounted relative to the shaft (2) and the roller (30) with the piston (11) acting on a rotatably arranged clutch disc (8) non-rotationally connected to the shaft (2) or roller (30) for pressing said clutch disc, on actuation of the clutch, against a corresponding face (13) non-rotationally connected to the roller (30) or shaft (2), or alternatively for lifting said clutch disk from said corresponding face (13).