Forward And Rearward Stitch Length Distribution (Fine); Setting Of The Control Knob (Including The Stitch Length Limitation) - Duerkopp Adler 4181i-3 Instructions For Service Manual

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3.5.2.3b Forward and rearward stitch length
distribution (fine)
When setting the maximum length of the stitch, the forward and the
rearward stitch length must be equal with the maximum error of ± 5 %.
This setting can be done only after having set the needle bar holder in
the direction of sewing (par. 3.2.6) and the wheel feed (par. 3.5.3.1.2).
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- Set the maximum stitch length .
- Place a suitable material under the presser foot and mark therein the
forward and the rearward stitch length.
- With an unequal length of the stitch, proceed to the correction
of setting by turning the screws (2 and 3). When tightening the
screw (3), the forward length of the stitch is shortened and inversely.
When tightening the screw (2), the forward stitch length is lenghtened.
- Each time first loosen one screw and then retighten the other one.
3.5.2.4 Setting the control knob
(including the stitch length limitation)
The control knob (1) is to be set up in such a way that, when turning it
in counterclockwise sense up to the stop, the maximum stitch length
valid for the given sewing category is attained (cat. 1: 3 mm, cat. 2 and
3 : 5 mm). The scale of the control knob is to be oriented in such a
position, so that the scale end corresponds to the maximum stitch
length, excepting the first sewing category, where the stitch length of
the indicator is 3 mm.
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- Screw in the screw of the control knob in such a way, that the
spherical surface of the screw (3) bears on the seat of the cam (4).
- Loosen the screw (5) and turn the control knob in the clockwise
direction, until the pin (6) of the knob (1) bears on the pin (7).
Tighten firmly the screws (5).
- Turn the knob in the counterclockwise direction up to the stop, when
the pin (6) of the knob (1) bears on the pin (7).
- In a sewing test check up the length of the stitch, if this corresponds
to the maximum stitch length valid for the given sewing category.
- If the stitch is longer, loosen then the screws (5) and turn the knob
in the clockwise direction and inversely. Tighten firmly the screws
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(5).
- Insert a screwdriver into the hole (8) of the scale (2) and adjust the
scale in such a way that the maximum length on the scale is against
the marking of the stitch length on the machine arm.
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- For the sewing category 1, set the control knob (1) on the stitch
length of 3 mm and check it by a sewing test.
- Loosen the screws (5) and turn the control knob (1) in the
counterclockwise direction, until the pin (6) of the knob (1) bears
on the pin (7). Tighten firmly the screws (5).
7 - Put a screwdriver into the hole (8) of the scale (2) and adjust the
scale in such a way that the value of the stitch length on the scale
6 against the marking on the arm is 3 mm.
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Caution! Danger of injury!
switch off the main switch! Before starting the setting
operation, wait until the motor stops!
Caution! Danger of injury
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!