the invention for compressive crimping of synthetic multifilament thread the device consists of a texturizing unit 1 and a cooling unit 2 downstream of the texturizing unit texturizing unit 1 has a nozzle shaped conveying duct 6 conveying duct 6 essentially consists of two sections that are separated from each other by a very narrow cross section in a first section shortly before the narrow cross section the nozzle holes of an injector 5 open out into conveying duct 6 injector 5 is connected to a fluid source that is not shown here in the second section below the very narrow cross section the conveying duct 6 expands and opens into a compressing chamber 19 that follows immediately in the inlet area of the compressing chamber 19 the compressing chamber wall is designed so that it is permeable to air and arranged within a stress relieve chamber 7 below the stress relief chamber 7 the compressing chamber 19 is continued by an ejection tube 8 with an essentially unchanged cross section at the end of the ejection tube 8 a stuffing outlet 9 is formed the texturizing unit 1 is designed so that it is height adjustable and connected to adjusting means 3 to do this texturizing unit 1 is connected by way of a carrier 14 to a movable slider 17 said slider 17 is guided in a guide 15 for positioning the texturizing unit 1 and or the slider 17 a control.