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Project by UsedTextilemachines.eu
Mission and Vision
Looking for the best opportunities to satisfy the customer:
Info
Mobile Phone: +393319020189
Timetables
Working hours: 09.30 / 12.30 - 16.00 / 18.00 From Monday to Friday.
Purpose of processing
This process is used to avoid the formation of blows and abrasions, dead folds and rolling
of selvedges that could occur on the pieces in the subsequent processing phases.
Processing technology
The pallets of pieces, coming from the preparation of the crude oil, must be positioned in the center of the machine
automatic, under the tensioner rods. The sack stitcher folds the pieces in the center, doing
match the selvedges (vivagnoli). The patches thus doubled, pass under the head of the stitcher and are
sewn together. At the end the piece looks like a long tube (cylinder).
The pieces must be positioned under the tensioner / expander rods (see figure A, point 1).
The fabric is passed over them by hand until it reaches the doubling triangle (fig. A, 2).
Here the selvedges must be coupled by hand in the correct overlapping position (even) and yes
the sack stitching starts slowly (see figure B, point 3). The beginning of the sewn piece must be
then passed on the folding machine (fig. B, 4).
At this point you can start sewing all the pieces of the same type in series.
For knitted fabrics: the machine is equipped with a specific device (fig. B, 5).
An electronically programmed control panel allows you to set all the parameters of
processing:
fabric tension,
centering of the piece,
chain stitch length,
measurement of the thickness and weight of the fabric,
desired programming of unsewn sections.
Dry typing
Any processing anomalies,
cause automatic shutdown
of the machine and signaling
of the cause on the control panel
command.
Labor management
The fabric to be treated is in its raw state and can therefore lose fluff. It is therefore a good idea to use
the machine accessories or a vacuum cleaner for proper cleaning of the various parts. Particularly
it is advisable to avoid that the fluff is deposited on delicate parts of the machine, such as photocells or
other.
Most recurring defects
A) Incorrect stitch length:
stitches that are too dense, cause excessive swelling of the pieces during processing;
points too far apart, little swelling and formation of defects such as dead folds
or beatings.
B) Sewing of the two selvedges not even, beyond 3/4 cm of tolerance,
it can cause the beginning and the end of the piece with the wefts diagonally, instead of horizontally,
with respect to the verticals of the warp and therefore to a "screwing" of the piece from one selvedge to the other,
harmful for subsequent operations of fulling, purging or rope dyeing.
In this case it is necessary to unstitch and sew up the piece in a workmanlike manner.
C) Significant differences in tension between the two selvedges,
that even starting with the even seam seam can, at the end of the sewn piece, create
a mismatch between the two selvedges and diagonal wefts, causing the same defects indicated in
previous point.
Also in this case it is necessary to unstitch the piece and sew it back together, helping if there is no device
ad hoc, to lengthen the selvedge more in tension.
D) Missing one or more stitches,
in subsequent processing, during the first passages under stress or tension, it provokes easily
an unstitching that makes the piece lose the necessary swelling.
Services
After the sale of the machinery we also assist you in logistics and if desired by the customer we have technicians capable of reassembling and starting the machinery.
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