Pfaff 3811-11/43, Instruction Manual

Page: 52 / 72

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22 Rear needle guard
22.1 Adjusting the height of the rear needle guard
Requirement:
With the needle bar at its t.d.c. (= adjustment hole “3”, fig. 3) the upper edge
of the vertical surface of the rear needle guard 1 (fig. 2) should be at the same
height as the upper edge of the eye of the needle (arrow in fig. 1).
.1 Bring the needle bar to its bottom dead centre (b.d.c.) (handwheel).
.2 Lock the needle bar in this position by inserting the cylindrical pin in hole “3” (fig. 3).
.3 Align the rear needle guard 1 (fig. 2) (screw 2)in such a way that the upper edge of the needle eye is
at the same height as the top end of the vertical surface of the needle guard (arrow in fig. 1).
.4 Remove the cylindrical pin.
.5 Carry out a check.
22.2 Clearance between the rear needle guard and the needle
Requirement:
When the point of the hook, coming from the right hand side, has reached the
right hand side of the needle, the needle should still be touching the rear
needle guard 1 (arrow in fig. 4).
.1 Turn the handwheel until the point of the hook, coming from the right hand side, has reached the right
hand side of the needle.
.2 Move the carrier 3 (fig. 5) (screw 4) in such a way that the needle guard 1 just touches the needle
without pressing against it.
23 The hook-avoiding eccentric guard
Requirement : The hook-avoiding eccentric 5 (fig. 5) should at no stage of its motion touch
the guard 6.
Align the guard 5 in accordance with the requirement (screws 7; can be reached through the
mounting aperture).