Textile printing apparatus

Claim 1

Apparatus for effecting the colouration of snythetic textile materials, at a reduced pressure, by a transfer process, which comprises a pair of opposed rigid platens mounted for relative movement towards and away from each other, means for heating at least one of said platens to a temperature above 100° C, means for enclosing at least a portion of the space between the opposed surfaces of said platens when the platens have been moved towards each other into a closed position and means for reducing the pressure, within said portion, when the platens are in said closed position, to below 100 mm of mercury, at least one rolling diaphragm air cylinder assembly having a cylinder, a piston within the cylinder and a flexible rolling diaphragm sealed at its periphery to the inside of said cylinder, said diaphragm being connected to said piston and forming an annular fold or roll which resides between a portion of the piston and the sidewall of the cylinder, one of said platens being supported from the piston of said rolling diaphragm air cylinder assembly, the space on the side of said rolling diaphragm from which the platens is supported being connected to the gas tight region between the platens whereby relative motion between the platens is effected by the differential pressure that is established across said rolling diaphragm when the pressure in the gas tight region is reduced.