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Resumen del manual
It must be completed before the needle enters the fabric again, approx. 8 mm above the needle plate (fig. 50). Check: • Set stitch width adjustment dial to the maximum zigzag width. • Set needle position adjustment dial to "center". • Press zigzag stitch button. • Remove presser foot. • Turn the handwheel in sewing direction, until the needle rises on the left-hand side and the needle point is positioned exactly on the surface of the needle plate (fig. 51). • You can check the start of the sideways movement of the needle by simultaneously touching the back side of the needle bar frame and the machine head with the index finger of your left hand while turning the handwheel very slowly with your right hand. Adjustment: • Loosen the two screws 101 (fig. 52). • Turn the handwheel in sewing direction, until the needle rises on the left-hand side and the needle point is positioned exactly on the surface of the needle plate (fig. 51). • Rotate the large gear 98 in the direction of the arrow until feeler finger 102 (fig. 53) is exactly at the starting point of rising cam 103. • Hold the large gear 98 firmly in this position to prevent it from turning. • Disengage the small gear 97 by moving it to the right, rotate it until one of the screws 101 is accessible and then move it fully to the left and re-engage. • Gently tighten screw 101. Cross-check: • Test the needle bar sideways movement as described under "Check". • Tighten the two screws 101. 27. Adjustment of zigzag stitch penetration in needle plate slot on Pfaff 1540 Requirement: The widest zigzag stitches must have the same distance to the left and right edges of the needle plate slot (fig. 54). Check: • Remove the presser foot. • Insert a new needle. • Set zigzag stitch adjustment dial to "5". • Set needle position adjustment dial to "center". • Press zigzag stitch button. • Turn the handwheel and check the left and the right clearance in the slot. Adjustment: • Loosen screw 84 (fig.38) and move stop 85 to the left. • Loosen screw 73 (fig. 55). • Rotate setting eccentric 74 until the two clearances are equal. • Tighten screw 73. Cross-check: • Turn the handwheel and check the clearances. 28. Adjustment of the stop for the left needle position on Pfaff 1540 Requirement: When all push buttons are switched off, the needle must be approx. 0.2 mm further left than the widest zigzag stitch. The needle must not touch the needle plate. Check: • Set stitch width adjustment dial to "5". • Set needle position adjustment dial to "center". • Press the zigzag stitch button. • Rotate the handwheel until the needle moves downward on the left side and is at a position of roughly 1 mm above the needle plate (fig. 56). • Press the button for the buttonhole bartack. The needle should now move approximately 0.2 mm to the left. Adjustment: • Set stitch width adjustment dial to "5". • Set needle position adjustment dial to "center". • Press the zigzag stitch button. • Loosen screw 84 (fig. 38). • Push stop 85 to a position 0.2 mm from the crank 90. • Tighten screw 84. Cross-check: • Press the zigzag stitch button and the button for the buttonhole bartack alternately and check whether the needle moves by approx. 0.2 mm without touching the needle plate. Stitch forming parts (sewing hook) Foreword: The sewing hook adjustment consists basically of the three following adjustments: • Needle rise (sewing hook timing) • Needle bar height • Hook-to-needle clearance Needle rise (sewing hook timing): The needle rise is the movement by which the needle must rise from its lowest position until a thread loop has formed on the side of the needle on which the scarf is located. Needle bar height: The needle bar height must be set in such a way that the sewing hook point can easily enter the thread loop above the needle eye at straight stitch and zigzag stitch settings. Hook-to-needle clearance: The distance of the sewing hook point from the needle must be as small as possible, so that the sewing hook point does not miss the thread loop. The sequence of sewing hook adjustments is as follows: 1. Hook-to-needle clearance 2. Bevel gear setting 3. Needle rise (sewing hook timing) 4. Needle bar height Shuttles and sewing hook types in lockstitch sewing machines CB-shuttle complete Shuttle body Bobbin case Bobbin Beak shuttle complete Bobbin Oscillating CBhook and beak shuttle Hook complete Hook body Hook gib Bobbin case base Bobbin case cap Bobbin Horizontal rotaryhook Hook complete. Hook body Hook gib andBobbin case base Bobbin case cap Bobbin needle guard Large horizontalrotary hook Hook complete Hook body Hook gib andBobbin case base Bobbin case cap Bobbin needle guard Vertical rotaryhook 29. Adjustment of needle clearance in needle slot in sewing direction Requirement: There must be a clearance of 0.2 mm between the rear edge of the needle shank and the rear edge of the needle plate slot (fig. 57). Note: Since system 130/705 H needles increase in size at the needle front side only, the point of a si...
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