Machine for dyeing fabrics wound up into endless fabric loops

In a machine for dyeing fabrics wound into endless fabric loops, including a dyebath tank containing dyebath liquor, a plurality of overflow or jet devices arranged in a series in said tank, a like plurality of reels associated with said devices for feeding a fabric loop successively through the devices in said series thereof, a pump for circulating dyebath liquor from said tank through said devices, and a microprocessor control unit for driving one of said reels at a predetermined speed, and the remainder of said reels at speeds determined by signals generated during the passage of said fabric loop through said devices, the improvement comprising means for monitoring the rate at which the fabric loop to be dyed passes through each of said devices, said monitoring means including a plurality of signal generating elements equal in number to said devices, said signal generating elements being secured to said fabric loop at equispaced intervals therealong for travel therewith through said devices, and a signal sensor mounted on each of said devices to sense and relay a signal to said microprocessor control unit each time one of said signal generating elements passes one of said sensors, the relayed signals being operative to cause said microprocessor control unit to synchronize the speed of rotation of said other reels with the speed of rotation of said one reel, so that it will take the same interval of time for each section of the fabric loop between an adjacent pair of said signal generating elements to pass through each of said devices.