VI.BE.MAC.S.p.A. 3022LV
Page 17
15.4 NEEDLE BAR MOVEMENT CAM
This cam serves to move the needle in synchrony with the fabric.
15.4.1 POSITION
In order to find the correct position for the needle bar movement cam with respect to the top shaft inside the sewing head, position
the needle bar at bottom dead centre.
Movement will now be perfectly symmetrical with respect to the needle plate hole.
The cam should be positioned with the vertical surface facing outwards.
Check the position against the two diagrams below:
In the rear view it is possible to observe:
Inside the right-hand assembly, the Eccentric Pinion Flat surface (1) is 90° with respect to the left-hand side of the connecting rod
(2) where the lever (3) is connected, and moves the needle bar pendulum.
1
2
3
Eccentric Pinion
Flat surface
Eccentric Pinion Flat surface 90°
with respect to the connecting
rod axis, when the Needle Bar is set
on the Bottom Point
Lateral view
3
1
Front
view
In the front view of the needle bar structure, the cam (1) inside the assembly is parallel 90° respects the connecting rod axis
15.4.2 MOVEMENT LENGTH
Always adjust the needle bar movement on the basis of the selected stitch length. To do so press button A on the upper part of the
head and turn the hand wheel located on the machine head. On the Wheel are marked the stitch length reference points.
1 = 1mm ; 2 = 2mm ; 3 = 3mm ; 4 = 4mm ; 5 = 5mm.
Always verify that the Needles are always in the same Position compare the Feed dog holes.
doesn’t touch the Needle Plate at the begin and end of its stroke.
When button A is pressed down:
- turning the hand wheel towards the operator (anticlockwise) makes the needle bar movement longer.
- turning the hand wheel towards the operator (clockwise) makes the needle bar movement shorter.
Release the button by turning it in an anticlockwise direction.
Insert a piece of paper of around 40 cm long and sew it in order to check whether the needle perforates the paper perfectly, or,
whether it is ripped (elliptic hole).
Adjust the movement length until the hole is perfectly made
WARNING
Never press button A while the machine is in operation.
Before starting up the machine, make sure that button A is released.
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