38
A shaft that should stay down, comes up when you make a shed
Possible cause:
•
The dobby hook of the faulty shaft did not come high enough after the previous shed. The
screw head should snap back above the blocking plate. Because the screw head stays
against the blocking plate, the dobby hook remains extended forward and will be picked
up by the knife, making next shed.
One reason why this happens is that the shaft does not go down to its lowest position
because it sticks to a shaft bar of the neighboring shaft. Leave some heddles at the ends of
all the shafts. This will help to guide the shafts along each other. Also be sure that the
Texsolv cords run through the slots of the shaft bars.
Another reason for the problem that a screw head does not come high enough to block its
non-selected shaft could be the level adjustment of the shaft in its cords, i.e., the shaft comes
back to its lowest position, but at this position the screw head does not slide over the
blocking plate snapping into the locking position. To check this you need to take the dobby
mechanism or interface off the loom first. When the shafts are in their lowest position, there
must be a 2-3 mm (1/16"- 3/32") clearance between the screw heads and the blocking plate.
If it is necessary to adjust this distance with a shaft, follow this procedure:
To prevent working on the wrong shaft, mark the shaft that needs adjustment with a piece of
colored yarn on both ends. Loosen the small bolts of the clamps that hold the shafts on both
sides to the cords just enough so that the clamps can be moved on the shaft ends. (Please
note that the heads of these bolts require a Phillips screwdriver, not supplied with the loom.)
When the bolts are loose, you can adjust the shaft in relationship to the cords, and by doing
so, to the dobby hook. Tighten the bolts again while the shaft is in its lowest position and the
head of the blocking screw is 2-3 mm (1/16"-3/32") above the blocking plate.
One shaft sticks 10 mm (about 1/2
"
) above the other shafts while it is in its lowest
position
Probable cause:
•
You loosened one of the shaft bars on both sides, and by accident, fastened it upside
down.
The shed is too small
Possible causes:
•
The knife of the dobby system is adjusted too high. Refer to point 7, page 11 for
instructions.
•
The beater is adjusted too high.
•
The warp has to be advanced.
•
The cable of the pedal doesn’t run properly around the disk that drives the knife.
One of the treadles cannot be pushed down
Possible cause:
•
Your foot is resting on the other treadle and you have inadvertently blocked the treadle
that you want to operate.
The dobby treadle cannot be pushed in
Possible reason:
•
The spring for the reversing disk sits half way on the guide instead of in the forward or
reverse position.
Summary of Contents for Megado 110
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