Brother International EF4-B561 Service Manual - Page 24

Procedures Q'ty of screw 1 Temporarily fasten lower knife holder support 0 on 2 needle plate support bracket 0. 2 Temporarily fasten lower knife holder guide 4) on needle 2 plate support bracket 0. 3 Insert spring 0 into lower knife holder 0, fit lower 1 knife holder into lower knife holder support 0, and tighten screw 0 just tight enough to keep it from sliding out (but not securely). 4 Temporarily fasten lower knife 0 on the lower knife 1 holder 0. 5 Install needle plate on needle plate support bracket Q. 2 The below items 0 and 0 should be taken simultaneously. 6 Loosen screws for lower knife holder guide 0, raise or 2 lower the tip of lower knife holder guide so lower knife 0 will be longitudinally equi-distant in the needle plate slot for lower knife, and temporarily fasten it. 7 Raise or lower lower knife 0 until the top of lower knife is level with the needle plate top, and fasten lower knife securely. Needle plate top 8 Remove needle. 9 Turn the pulley until needle bar is raised to the highest position, fit nut e on upper knife driving arm O. 10 Temporarily fasten upper knife 41. ) in upper knife holder 1 • 11 Temporarily fasten upper knife holder m on the upper knife driving arm 0. (Toutch upper knife to lower knife lightly.) 12 Loosen screw and bolt for lower knife holder support 0 2 so as to fit lower knife face and upper knife face and temporarily tighten it. 13 Lower upper knife mi all the way, and adjust so that upper knife will engage lower knife 0.5 - 1 mm deep. 14 When upper and lower knives are engaged, adjust the 2 angle of lower knife so that the lower left angle of upper knife will match the upper left angle of lower knife, and fix it securely. 15 For adjusting the engagement of upper and lower knife, 2 loosen the screw and bolt which fasten lower knife holder, turn the lower knife holder about the bolt until there is a clearance corresponding to the thickness of 0 to O.Olmm, then retighten the screw and bolt. (As per figure next page.) A 0.5- i mm (§D Needle plate Top of lower knife Top of lower knife rat)) - 22 -