Pfaff hobbylock 784 Owner's Manual - Page 23

* 0 Disengaging the upper knife Remove lint box 8. Open work support 12 and looper cover 10. If necessary, loosen screw 38 for axial upper knife blocking. Push rotary lever 27 of the axial upper knife guide fully to the right, hold it, and turn it forwards until pin A engages in the hole of the knife. Now the upper knife is disengaged. cA - fl\ Adjusting the seam width c The standard seam width setting is marked with N (3.5 mm). Disengage the upper knife according to the above description. The desired seam width is set with adjusting knob 26. The scale on the seamwidth adjustment knob ranges from 2.5 to 5. Set the upper knife at its basic position again and close the looper cover. When processing thick fabrics, securely tighten screw 38 for blocking the upper knife, see page 14, Sew a test seam. Note: After adjusting the seam width, it may be necessary to re-adjust the thread tension. 21