Device for depositing a pasty substance on a surface automatically and automatic machine therefor

Device for automatically depositing on a surface, a pasty substance packaged in a fluid-tight and flexible reservoir, said reservoir being removably fixed in a fluid-tight housing, the outlet orifice from this reservoir for the pasty substance being connected to an outlet nozzle including at its free end a cut-off valve which can be opened by contact with the surface, said housing being connected to a source of pressurized gas and means being provided to control the admission of this gas into the housing, said housing comprising a cylinder open at its free end and surrounding the outlet nozzle, a slidably mounted piston made fast to said nozzle inside said cylinder, means being provided to control the sliding of said piston towards the open end of said cylinder, so as to cause the outlet nozzle to project outside the open end of the cylinder, comprising also means for returning said piston into said housing after the cessation of the action of the pressurized gas.