| CPC D05C 15/10 (2013.01) [D05C 15/14 (2013.01); D10B 2505/202 (2013.01)] | 20 Claims |
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1. A yarn injection device for injecting yarn sections into a ground, wherein the yarn injection device comprises:
a yarn storage comprising a number of spool holders for holding a number of spools with yarn,
a feeding device configured to feed lengths of yarn via respective supply paths from the storage to an injection unit, the feeding device comprising:
a number of yarn tubes, each yarn tube defining a yarn channel configured to accommodate a respective yarn, and
a number of cutting devices located at a side of the number of yarn tubes and being configured to cut a number of yarn sections from the respective yarns extending from the yarn storage into the yarn tubes,
wherein the feeding device is configured to feed an adjustable length of yarn to the yarn injection device,
the injection unit comprising:
an injection needle guide defining a number of first passages extending over a vertical distance and a number of second passages extending over a horizontal distance, wherein each first passage intersects a respective second passage, and wherein each yarn channel is fluidly connected to a respective second passage,
a number of moveable injection needles moveable between an upper needle position and a lower needle position and configured to pass through the first passages of the injection needle guide, wherein when yarn sections in the yarn tubes are located below the moveable injection needles and the moveable injection needles move downward through the injection needle guide, the yarn sections are injected into the substrate, and
at least one needle actuator configured to move the number of moveable injection needles between the upper needle position and the lower needle position,
a fluid flow assembly comprising at least one fluid communication channel and a depressurized compartment having an underpressure, wherein the at least one fluid communication channel extends between the injection needle guide and the depressurized compartment,
wherein the supply paths extend from the respective spool holders via the feeding device to the injection unit, and the feeding device is configured to supply the yarns to the injection unit, and wherein the fluid flow assembly is configured to create a flow of fluid through each fluid communication channel, each injection needle guide and each yarn tube in order to apply a drag force on the yarns and move the yarns through the second passages in the injection needle guide,
wherein the yarn injection device further comprises a cutting device moving system configured to move the number of cutting devices towards or away from an intersection of the first passages and the second passages.
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