WEFTMASTER ®

Solutions for top quality fabrics

46857003en
TOP QUALITY FABRICS
WEFTMASTER ®
SOLUTIONS FOR TOP FABRICS

The history of LOEPFE BROTHERS LTD. is the history of its on: the customer list includes all leading weaving machine
ideas and solutions. Since more than 55 years LOEPFE is manufacturers and their customers.
a synonym for competence and consequence in compre-
hensive solutions for quality assurance in the weaving and Customized Solutions as required
spinning mill. It is not accidental that the worldwide active LOEPFE develops customized solutions for integration
Swiss company is also known as «Masters in Textile Quali- into the most modern machines in close cooperation with
ty Control» in the industry. machine manufacturers. The advantages are: the machine
manufacturers can fully rely on the comprehensive expe-
Specialists working Hand in Hand rience in the area of filling thread insertion during every
As textile electronic specialist in the field of filling thread product phase. In particular, the enormous flexibility is
insertion systems on weaving machines, LOEPFE has a appreciated. Thus, LOEPFE is capable of producing functi-
worldwide experience on all machine types. Not only elec- onal samples and prototypes within the shortest possible
tronic engineers and software specialists but also weaving time in its own facilities in Switzerland.
specialists are working hand in hand. A fruitful cooperati-

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Weft Thread Brake 4
optimal controlled brake time
for projectile and rapier weaving machines

Weft Stop Motion 6

detection of every filling break
for air-jet weaving machines

Weft Stop Motion 8

detection of every filling break
for rapier weaving machines

Knot Detector 10
monitoring of all knot-type thickenings
for all types of weaving machines

Yarn Defects Sensor 12

detection of smallest knots, fluff and filamentation
for all types of weaving machines

Yarn Stop Motion 14

monitoring of the running yarn
for all types of weaving machines

Short Weft Detector 16

monitoring of the weft insertion into the last phase
for projectile weaving machines

Thermo Cutter 18
separation and fusing of synthetic fabrics
for all types of weaving machines

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WEFT THREAD BRAKE
WEFTMASTER®
Minimum weft thread tension
SFB-L owed to optimum brake timing

for projectile and rapier weaving machines

Features
• higher machine performance and better fabric quality
• less weft thread breakage
• amortisation within one year by better quality of fabric
and increase of machines‘ efficiency
• easy handling
• self cleaning

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SFB-L deviation brake head SFB-L flat spring brake head

SFB-L SFB-L Flat Spring Brake Head

• guaranteed optimum late braking start due to electro- Preferably for use with filling threads with low tensile
nic control by the projectile sensor which results in strength.
minimum, uniform weft thread tension. • preferably for use with filling threads with low tensile
• gentle braking of the weft threads with the LOEPFE strength
brake assembly, thus fewer weft breaks. • the resilient pressing system with gentle thread hand-
• no change in brake performance due to yarn abrasion, ling requires absolutely no initial tension of the filling
due to the self-cleaning deviation principle thread, i.e. the output tension can be reduced to the
• all brake parts in contact with the thread are made of absolute minimum on the accumulator
wear-resistant ceramic • the electromechanical system of the deflection brake
• sturdy construction of the brake assembly with only head, which has delivered an optimal performance in
one flexible part practice in the weaving mill, has been retained
• retrofittable to all projectile weaving machines • all brake heads are exchangeable and can also be used
in mixed operation on the multicolor weaving machines
• the control of the optimally delayed braking begin
takes place by means of the patented projectile sensor
with millisecond precision as with the delayed brakes.

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WEFT STOP MOTION
WEFTMASTER®
Detects every weft break on air-jet
SWA weaving machines.
Reliable monitoring of all types of
for air-jet weaving machines
weft breakes by sensors which are
mounted on the sley.

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Advantages Features
• instant detection of a weft fault • automatic light readjustment when sensors are dirty
• work with all types of yarn • easily attachable control box with digital outputs for
• can monitor the yarn at a low tension the sensor signal
• insensitive to dust, dirt or humidity • four sensitivity levels
• reliable

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WEFT STOP MOTION
WEFTMASTER®
The weft stop motion detects
SW-G / SFW-L any yarn break or yarn stoppage

for rapier and projectile weaving machines

The movement of the weft yarn is detected up to the fabric
selvedge with piezo-electric signal transmitters. The reli-
able monitoring of the weft insertion is performed on the
overall fabric width and even for different weft yarns. The
weft yarn moves over the sensing device without additio-
nal tension and with only little deviation.

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SW-10G for rapier weaving machines SFW-L for projectile weaving machines

Features
• instant detection of a weft fault
• direct signaling to the control unit of the weaving ma-
chine
• works with all types of yarn
• 8 thread guides
• single or multiple input possible
• monitoring of yarn at a low tension possible
• insensitive to dust, dirt or humidity
• reliable

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KNOT DETECTOR
WEFTMASTER®
The piezo-electrical knot detector
KW monitors all knots in running
yarn - simple and reliable.
for all types of machines

„Knotless weaving“

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 KW-1R

Applications Advantages
When a knot passes the sensor, a predefined • compact and robust construction
action can be released, such as activating: • quick reaction time
• a stop at the textile machine • simple adjustment
• a weft accumulator • suitable even for finest yarns too
• a cutter • no wear and tear
• a counter • no additional yarn tension
• no false impulses by fluff
• indicator lamp on amplifier box
• every kind of yarn up to a diameter of 3mm

Alternative product: WeftMaster FALCON-i

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OPTICAL YARN DEFECTS SENSOR
WEFTMASTER®
Removing smallest knots,
FALCON-i fluff and filamentation
for all types of machines
Loepfe’s novelty in optical quality assurance is reliably re-
moving smallest yarn defects in the textile manufacturing
process.
Wherever hardly detectable yarn impurities can affect your
valuable end product, you will prefer Loepfe’s FALCON-i as
your companion for achieving quality beyond expectations.

The new optical yarn defects sensor FALCON-i is an im-

portant innovation to complement the solutions of the
knotless weaving concepts. All conventional knot detectors
have limitations in regard to the size of the yarn defects
or knots to be detected. Problems faced in manufacturing
high-tech fabrics, such as eliminating smallest knots, fluff
or even filamentation from the weft yarn, are solved by
installing FALCON-i yarn defects sensors.

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 Eliminated defects in multifilament yarn

Filamentation Fluff

Application Advantages & Features

• wide yarn range: 20 – 3000 dTex • detects fluff, knots and filamentation
• color of yarn does not matter • easy, intuitive user interface
• yarn speed up to 30 meters/second • one button operation
• conductive materials (carbon fibers) • settable sensitivity level to match
• monofilament or multifilament yarns your end-product quality requirements
• chemical resistant housing • automatic or manual setting of sensitivity
• processor controlled optical detection engine
• fast, uncomplicated installation and setup
• industry Standard Connector
• PNP and NPN signal output
• evaluation electronics shielded against electrostatic
or electronic magnetic interference
• only minimal yarn deflection needed
• Other sensors can be omitted or replaced by FALCON-i

Alternative product: WeftMaster KW

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YARN STOP MOTION
WEFTMASTER®
The piezo-electric yarn stop motion
FWL detects any yarn break or yarn
stoppage
for all types of machines

Application
Various applications wherever threads must be
continually monitored.
• winding machines
• roving machines
• yarn preparation machines
• sewing machines
• texturizing machines
• spinning machines
• cable machines
• twisters
• plastic rattan weaving

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FWL-R FWL-S

Features FWL-S
Movement detection on yarn or cable The FWL-S sensing heads and the SG-25 control device
• accepts all yarn qualities form a unit for monitoring up to a maximum of 25 yarn po-
• fast reaction sitions with common switch-off. The following additional
• minimum of yarn tension functions are integrated in this version:
• insensitive to dirt • individual display of yarn break position
• high noise immunity • blocked display for external switch-off, e.g. for manual
• no moving parts stop
• maintenance free • automatic start-up bridging via motor contactor
• test switch for functional check in case of machine
FWL-R standstill
FWL-R sensing head with logical signal output • stop relay with automatic reset
for activation of:
• LOEPFE RKL relay box Control unit supply voltage SG-25:
• relay in machine control 110 V - 575 V 50/60 Hz oder 24V DC
• machine control electronics Sensing head supply voltage: DC 15 V

Operating voltage: AC 12-30 V / DC 15 - 40 V

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SHORT WEFT DETECTOR
WEFTMASTER®

KBW-L The present generation of electronic weft

stop motions monitors weft insertion on
for projectile weaving machines projectile weaving machines up to the
range of 310 machine degrees, i.e. shortly
after arrival of the projectile in the receiving
mechanism.

An extension of monitoring to the end of the pull-back

phase at 0 machine degrees is achieved with the KBW-L
short weft detector especially developed for top quality
requirements in the weaving mill. This also safely detects
the shortest mispicks in the right fabric selvedge area.
The heart of the KBW-L is the one-piece optical sensor to
be fit at the right end of the reed. If the weft insertion is
correct an infrared light beam crosses the weft thread at

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about 0 degrees and is briefly interrupted simultaneously.
If there is no weft thread and therefore no light interrupti-
on, the machine is stopped at approx. 85 degrees, i.e. after
the reed beat-up but still before insertion of the next weft
thread. Short mispicks can easily be seen in this machine
position and corrected by the operator.

Features
• stops the machine prior to insertion of the next thread
• simple assembly
• simple handling
• indication of pollution
• quick amortisation by higher fabric quality

KBW-L Sensor

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THERMO CUTTER
WEFTMASTER®
Electronically controlled thermo
TC-1 cutters for fusible separation of
synthetic fabrics.
for all types of machines

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TC-1 with different cutting wires

Applications Advantages
• cutting and welding of fine to coarse fusible fabrics • self-insulating ceramic thermo cutter body
• cutting with up to four thermo cutters at maximum • simple low-cost solution
thermal output • clean, sharp cutting edges
• offered by many weaving machine manufacturers as an • minimal maintenance and negligible wear
option ex works • compact design
• simple to retrofittable to all weaving machine types • centrally adjustable temperature
• separately adjustable idle and operating temperature
• fast heating at machine start-up
• temperature reduction of cutter
during machine stoppage
• stabilized cutter temperature when
voltage variations occur
• machine is stopped by relay contact upon cutting wire
breakage
• test mode switch

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 Loepfe Brothers Ltd.
YarnMaster and MillMaster are registered 8623 Wetzikon/Switzerland
trademarks of Loepfe Brothers Ltd. Phone +41 43 488 11 11
Fax +41 43 488 11 00
sales@loepfe.com
www.loepfe.com

Subject to technical modifications