AVL Looms Jacq3G, User Manual

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Jacq3G Loom User’s Manual Troubleshooting
Equipment Fixes Page | 155
Upper guide alignment:
If the hooks show any forward or rearward lean, adjust hex nuts for the
upper guide until the hooks are vertical. Loosen the outer hex nuts, then
cycle hooks up & down with null picks.
Looking down from above while at open shed and hooks down (null pick),
observe the hook alignments in relation to each other and the upper guide.
If the hooks appear paired, the solenoid mount bars are misaligned from
front to back.
Determine which solenoid mount bar is incorrect by observing hook leaning
forwards or backwards, loosen its hex nuts, slide the solenoid mount bar
until the hooks are no longer paired, then retighten the solenoid mount bar
hardware.
Loosen the outer hex nuts for the upper guide. Recycle the hooks up & down
with null picks. Align the upper guide with slightly more gap between the
hooks and guide towards the back of the loom. Retighten hardware.
Short segment crossover:
If you examine a bare hook, you see that it has a longer and shorter
segment both terminating in short u-bends, with the two segments joined by
a u-bend. The short segment can become trapped behind the long segment
or adjacent hook long segments. When this occurs, the hook will have a
strong tendency to turn. Observation and fixing at a tight sett can be
difficult, so opening the sett may be required. To fix, simply move the short
segment from behind to its proper position.
Knife alignment:
Knife angle: If the angle of a knife is observably different from the
neighboring modules it must be remedied before any further loom use.
Failure to do so will cause bearing failure. The knife angle and knife height
alignment procedures are the same -- see below.
Knife height: Knife alignment procedure requires that the heddle springs be
released from the anchors at the bottom of the loom and that the loom be at
center shed. Once complete, reconnect the springs and reset the shedding
programming to double shed.
Upper knife angle adjustment: Loosen the button head cap screws for the
drive cable clamps mounted to the knife. The upper knife should slide
smoothly without damaging the cable sheathing. Slide the knife until the