The bartack stitches on the back-pocket corners and at the edges of the belt loops damages the fabric during washing; manufacturers began using felt pieces under the bartack stitches. However this operation led to extra man power and time causing extra cost as well as inconsistencies. D-BF 420 is has an electronically controlled automatic felt feeding and cutting system attached to a Brother type head to solve all these in one. Brother type bar tack head is an oil-free, clean and durable machine thanks to the black diamond bar thread pick-up lever and the micro-oil lubrication system direct to the rotary hook. Fabrics are prevented from oil stains.