曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
by companies that specialize in attachments. They utilize
special feed dogs, throat plates, and presser feet in
addition to the folder. This type of folder is hinged to
Figure 6-77. Thread the machine.
6-21
swing out of the way for changing bobbins. Most
machines have several adjustments that allow for fine tuning
the folder for optimum performance depending on the
tape used. Folders cost several hundred dollars.
Figure 6-79. Material with binding tape.
Another type of attachment is used to feed reinforcing
tape such as 3/8" Ty-3 onto a canopy seam. This is a simple
guide, which is attached to the presser foot and feeds
the tape evenly to the needles. Yet another attachment is a
seam folder used to make a French fell seam in canopy
construction. Figure 6-82 on page 6-22 shows both of the
above attachments used in conjunction with each other.
Over the years, the sewing industry has developed literally
Figure 6-78.Troubleshooting guide.
TROUBLE PROBABLE CAUSE REMEDY
Needle breakage Incorrect class and variety of needle being used Use correct class and variety needle
Needle loose in clamp Tighten needle clamp screw
Needle too small for fabric Use larger needle
Operator pulling on fabric Allow machine to feed material
Needle thread breakage Thread too heavy for needle Use larger needle or smaller thread
Right twist thread being used Use left twist thread
Machine incorrectly threaded Check machine for proper threading
Needle thread tension too tight Loosen needle thread tension
Thread take-up spring out of adjustment Adjust thread take-up spring
Burr on bobbin case, shuttle point or tension Smooth with emery cloth
discs
Thread rubbing against presser foot Adjust presser foot
Needle is bent or has blunt point Replace needle
Bobbin thread breakage Bobbin tension too tight Adjust bobbin tension
Bobbin incorrectly threaded Thread bobbin to revolve clockwise
Bobbin wound too fully to revolve freely Remove some of the bobbin thread
Rounds of bobbin thread lapped over Ensure bobbin thread is straight when winding
one another bobbin
Bobbin case is dirty Clean and lubricate bobbin case
Skipped stitches Machine out of time Time needle to shuttle
Thread controller spring out of adjustment Adjust thread controller spring
Drawing of seam Both needle and bobbin tension too tight Loosen needle and bobbin tension
Stitches piled up Stitch regulator out of adjustment Adjust stitch regulator
Pressure on presser foot too tight Loosen presser foot adjustment screw
Feed dog striking Feed dog set too high Lower feed dog to correct height
throat plate
Troubleshooting chart for light duty drop feed machine
Figure 6-80. Straight binder.
hundreds of different attachments to speed up and
improve the sewing process.
Figure 6-82.Tape feeder and French seam folder.
THE PARACHUTE LOFT
The term “loft” comes from earlier times when the area
used to pack and maintain parachutes was usually situated
in the aircraft hangar above the aircraft. Hence, the
term “loft.” The name has continued to this day and is
synonymous with the parachute workshop.
Under 14 CFR, subsection 65.127(b), a rigger must have:
“Suitable housing that is adequately heated, lighted, and
ventilated for drying and airing parachutes.” Under 14
CFR, subsection 65.127(d), the rigger must have:
“Adequate housing facilities to perform his duties and to
protect his tools and equipment.” All of this only makes
sense in that the properties stipulated are those that are
best suited for storing and maintaining parachutes.
Although these regulations have been in effect for over 40
years and were originally intended to apply to parachutes
with organic fibers in them, they still apply today. From
the practical side, keeping yourself and the parachute
warm promotes efficient work habits. Good lighting means
that you can properly inspect the parachute. Ventilated
means that the parachute is properly dried before packing.
Keeping your tools clean, dry, and serviceable means that
you can do the correct job on the parachute.
Most individuals have been to automotive garages where
there was oil on the floor and parts strewn everywhere. In
contrast, modern professional garages sometimes look like
hospital facilities in their cleanliness and organization.
Where would you take your car? The same is true with the
loft, as depicted in figure 6-83. A clean, organized, and welldesigned
loft inspires customer confidence in the rigger’s
ability to work on the parachute.
Figure 6-81. Right angle binder.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：
Parachute Rigger Handbook(66)
