EP0894886A1 - Procédé de surveillance de la tension du fil, détecteur de casse-fil et barre de casse-fil - Google Patents

Procédé de surveillance de la tension du fil, détecteur de casse-fil et barre de casse-fil Download PDF

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Publication number
EP0894886A1
EP0894886A1 EP97810547A EP97810547A EP0894886A1 EP 0894886 A1 EP0894886 A1 EP 0894886A1 EP 97810547 A EP97810547 A EP 97810547A EP 97810547 A EP97810547 A EP 97810547A EP 0894886 A1 EP0894886 A1 EP 0894886A1
Authority
EP
European Patent Office
Prior art keywords
thread
thread monitor
eyelet
signal
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97810547A
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German (de)
English (en)
Inventor
Franz Lässer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Franz Laesser AG
Original Assignee
Franz Laesser AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Franz Laesser AG filed Critical Franz Laesser AG
Priority to EP97810547A priority Critical patent/EP0894886A1/fr
Publication of EP0894886A1 publication Critical patent/EP0894886A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/08—Thread-tensioning arrangements
    • D05C11/14—Stop motions responsive to thread tension or breakage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a method for Monitoring the thread tension on an embroidery machine, in particular Schifflistickmaschine, in which method an eyelet by the force of the thread tension of the tensioned Thread transversely to the thread direction against one of the to moving mass dependent force is moved according to Position of the eyelet to trigger a signal.
  • Thread monitor has a piece made of a piece of wire Thread monitor hook, which on an electrically conductive Rod is pivotally mounted.
  • the thread monitor hook is a two-armed lever, which on its first arm or Lever has an eyelet.
  • the wire is at the eye opposite end of the arm in a certain radius and about twice the diameter of the winding appropriate length wrapped. Extends from the winding a second lever in practically opposite Direction to the first lever.
  • the winding serves as a sleeve, with which the thread guard hook on the under tension standing ladder rod is pivotable.
  • On the first Lever is a short, insulating sleeve slidable arranged with which the thread monitor are switched off can. As long as the thread does not run through the eye or the Thread is not taut, gravity pushes the first Lever against a contact bar, which is a second, with the Mass of the machine represents connected conductors.
  • the thread monitor hook is activated by the Thread tension kept out of contact with the second conductor.
  • the counteracting force of gravity is missing tension on the eyelet, contact between the two conductors over the first lever of the thread monitor hook manufactured.
  • This contact applies a voltage to one Monitoring unit, which triggers a signal and on displays on a screen.
  • the ladder bar is in sectors divided, which individually on the monitoring unit are connected, so the sector in which a Contact has been made is displayed on the screen.
  • Such a thread monitor should now be put out of operation e.g. because the embroidery site in question is not activated the insulating sleeve must be on the first lever be moved to make electrical contact prevent if the lever rests on the contact strip.
  • this thread monitor is that it only can determine whether the thread is broken or not So there is thread tension or not. A Checking the height of the thread tension is not possible. In addition the thread monitor check mark starts at high revs of the Flutter the machine because the machine is operating rapid changes in thread tension. By fluttering that can be intensified by resonance phenomena the reliability of the displayed error messages decreased. Next is the commissioning or Decommissioning the thread monitor of an embroidery site by moving the insulating sleeve a lot impractical.
  • the flutter movement can also be caused by a motion-dependent force, i.e. a force from one aerodynamic, hydrodynamic or electrodynamic Effect to be dampened.
  • the eyelet is very calm, the position of the eyelet corresponding to the thread tension.
  • the spring force and the force from a dynamic effect can be used individually or in combination to soothe the Eyelet movement can be used.
  • Be dynamic effects e.g. through a damping wing that moves with the eyelet caused by its movement in a gaseous or liquid medium triggers vortex. It is also possible, apply a magnetic field to in an attenuator or -wing generating eddy currents. If only dynamic effects used to calm the eyelet, the eyelet must be passed through the Gravitational force pressed into the signal-triggering position become. If this task takes over the spring force, it can Gravity also act against the spring force.
  • the eyelet or thread can e.g. via optical means Trigger signal.
  • the eyelet is a Switching element moves, which in turn triggers the signal. This increases the reliability of triggering a signal elevated.
  • a switching element can trigger a signal interrupt a beam of light or an electrical one Close or interrupt contact. It is preferred that the switching element at too low a thread tension closes electrical contact and thereby one Monitoring device controls.
  • the signal is conveniently for a group of Embroidery points recorded and in the group causing the signal displayed.
  • a group of embroidery sites can e.g. 15 to 20 Embroidery sites but also only a single embroidery site include.
  • the signal can advantageously be acquired decentrally e.g. through an intelligent circuit directly at the Embroidery site. This monitors the thread tension in Units can be summarized. If one unit fails, that is corresponding unit can be replaced quickly and easily. A As a rule, troubleshooting does not have to involve several possible positions, e.g. on the thread monitor, the Cabling, the central control unit, etc. extend.
  • the invention also relates to a thread monitor for a Embroidery machine, especially Schifflistickmaschine, after Claim 8 and 9.
  • the thread monitor eyelet is expedient and at most a connected switching element in one no signal triggering position with a switch part fixable to with the embroidery position switched off Prevent error signal.
  • A suitably serves this purpose Switch, with advantage when pivoting the Switch part also moves the spring so that it in the thread monitor position is not tensioned is.
  • the spring and the switch part are therefore advantageous made to turn off the thread monitor in one piece.
  • the thread monitors are expediently on a bar arranged on which the two conductors with insulating Spacers are fixed.
  • a simplified Execution can also be a ladder on which the bar a second conductor is fixed.
  • Strip with two conductors If one ladder serves as an axis and therefore expediently over several embroidery points is continuous, can be divided by the other leader the size of the groups to be displayed regardless of the Last length can be determined.
  • a lever serves as Switching element and establishes the contact between the two conductors forth. Its second lever facing away from the eyelet is preferably angled to engage the spring be and also serve as a starting point for the switch part.
  • the spring is advantageously on the axle as a leaf spring of the thread monitor hook. This shortens the Spring arm with increasing tension of the spring, what the Resistance of the spring increases. The existing one anyway The spring force increases with increasing distance from the eyelet the signal-triggering position, or increasing Spring tension is thereby increased. this causes an additional calming of the eye movements because extreme Rashes of the eyelet slowed down by a higher counterforce become.
  • the eye movement is advantageously dampened. This can be done with a magnetic field and one moving in the magnetic field Damping wing, or an eddy current plate happen, or also easier with a damping wing, which through the Movement of the eyelet in a gas or liquid moves becomes. This makes the flap movements of the eyelet additional calmed down. With a damping wing can also be brought up Thread monitor hooks can be retrofitted.
  • the invention also relates to a thread monitor bar for a ship embroidery machine according to claim 17.
  • a bar is advantageously also a support for display devices, for example light-emitting diodes, which indicate an error message at the point of occurrence.
  • display devices for example light-emitting diodes, which indicate an error message at the point of occurrence.
  • the strip is also advantageous as a U-profile, on the open side of which the ladder and thread monitor are mounted.
  • the cavity of the bar advantageously serves as an installation channel for the display elements.
  • Figures 1 and 2 show the arrangement of a thread monitor 11 in an embroidery machine.
  • the drawing is cut Thread roller 13, then in the thread running direction Thread monitor carrier bar 15 with the display diode 17 and the fastened on the bar 15 with a spacer 19 Heads 21 and 23, and at a distance from the thread monitor 11 that Thread support tube 24.
  • the thread monitor 11 consists of a Thread monitor carrier bar 15, a distance profile 19, the attached conductors 21 and 23, one Thread monitor hook 25, which on the conductor 23 is pivotally mounted, and a switch part 27.
  • Ein Thread 29 comes from the thread roller 13, runs through the eyelet 31 of the thread monitor hook 25 and over the thread monitor 11 and a thread support tube 24 further down to the needle and Embroidery base.
  • the thread monitor hook 25 is bent from a piece of wire (see Figure 3). It has an arm 33, on one of which End the eyelet 31 is arranged. At the other end of arm 33 the thread monitor hook 25 has a sleeve 35 so as to to sit rotatably on a rod, the head 23.
  • the sleeve 35 is formed by a series of turns 37 of the piece of wire.
  • Opposite arm 33 protrudes from sleeve 35 a lever 39 from.
  • This lever 39 is at a distance from the Axis of rotation 41 bent at a right angle so that its End 43 runs parallel to the axis of rotation 41.
  • This bend lever 39 is the only innovation on the thread monitor hook 25 compared to the previously used.
  • the angled end 43 of the lever 39 now serves as an engagement lever for the spring 45 and the switch part 27.
  • the central monitoring unit 75 on which the two Conductors 21 and 23 are electrically connected, registered the current flow or the resulting voltage drop, and indicates the location or area where the contacting has taken place.
  • the display is as before on a central monitor 79, but also on the Thread monitor carrier bar 15.
  • a light-emitting diode 17 is used for this.
  • One of the two conductors 21, 23 is to trigger a signal undervoltage.
  • the other leader, e.g. 21, is in sectors divided, which individually to the monitoring unit 75 are connected. When contacting a sector which can include several thread monitors, the LED lights up 17 in this sector. Now only the corresponding one has to Sector on a thread break or an insufficient one Thread tension can be searched. The sector can be very small to get voted.
  • the two conductors 21 and 23 consist of round rods, which in troughs 49, 51 in the spacers 19 made of plastic to sit. These in turn are on the carrier bar 15 put on. It can be seen from FIG. 5 that the troughs 49 and 51 for the conductors 23 and 21, a slightly narrowed U-profile at the top have, whereby the conductor bar 21,23 in the trough is held. With grooves 58, lugs 60 and springy Pawls 61, the spacers 19 sit on the support bar 15.
  • the one-piece plastic switch part 27 ( Figures 4a and 4b) has an operating disc 53. This sits on the conductor 23 with a U-shaped recess 55 ( Figure 1, 6). On one side of the control disk 53 a mandrel 57 with a leaf spring 45 is arranged. On the other side, a spacer 59 is arranged so the required distance between each Thread monitors or embroidery sites is observed. To the Places where a spacer 19 is inserted (Fig. 7a), is a switch part 27 'with a short spacer 59' intended. The plastic spring 45 moves with the Switch part 27, whereby the spring 45 when the Thread monitor 11 is relieved.
  • FIG. 6 An advantageous embodiment of the thread monitor 11 is shown in Figure 6 shown.
  • the carrier bar 15 is as in de Figures 1 and 2 trained.
  • the spacer 19 has a resilient pawl 61.
  • the spring travel of the pawl 61 allows a latching of the spacer 19 into the carrier bar 15. So that the pawl 61 cannot unintentionally come loose them with a bolt 63 opposite the main part 65 spread apart.
  • the spacer 19 is used and then the bolt 63 into a corresponding shape 64 in the joint between pawl 61 and body 65 introduced.
  • the locking device 67 has one Spring neck 69 and a release lever 71 and one Locking pawl 73.
  • the locking pawl 73 engages in the off position partially around the conductor 21 so that to turn on of the thread monitor with the release lever 71, the latch 73 must be pivoted to slide past the conductor 21 to let.
  • FIG 6 is also schematically one in the support bar 15 arranged circuit 75 shown, the Supervision of a group of thread monitors takes over.
  • This Circuit 75 triggers on a signal from a thread monitor an ad from his group. This can be done on one central screen as well as the group itself become.
  • the display diode 17 is used to display the group.
  • FIGS 7a and 7b show a thread monitor bar, at which alternately on the conductor 23 Thread monitor hook 25 and switch parts 27 are seated.
  • Thread monitor hook 25 At a constant distance from each other arranged.
  • the ladder 21 and 23 are interrupted after the five embroidery positions and one LED 17 each shows a fault in one of the five Embroidery points.
  • FIG. 7b also shows how thread monitor hooks with a Damping wing 77 (only one is shown) could be. Damping vanes 77 brake the movements of the Thread monitor hook 25. The faster the movements are, the bigger the eddies caused and the bigger is also the braking force of a damping wing 77.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP97810547A 1997-07-31 1997-07-31 Procédé de surveillance de la tension du fil, détecteur de casse-fil et barre de casse-fil Withdrawn EP0894886A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97810547A EP0894886A1 (fr) 1997-07-31 1997-07-31 Procédé de surveillance de la tension du fil, détecteur de casse-fil et barre de casse-fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97810547A EP0894886A1 (fr) 1997-07-31 1997-07-31 Procédé de surveillance de la tension du fil, détecteur de casse-fil et barre de casse-fil

Publications (1)

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EP0894886A1 true EP0894886A1 (fr) 1999-02-03

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EP97810547A Withdrawn EP0894886A1 (fr) 1997-07-31 1997-07-31 Procédé de surveillance de la tension du fil, détecteur de casse-fil et barre de casse-fil

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1098025A1 (fr) * 1999-11-05 2001-05-09 Franz Lässer AG Barre de casse-fil
KR20020074133A (ko) * 2002-09-04 2002-09-28 남명규 자수기의 절사 감지장치
EP1489214A1 (fr) * 2003-06-16 2004-12-22 Franz Lässer AG Dispositif de retenue de fil et barre de dispositifs de retenue de fil

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE665364C (de) * 1933-11-25 1938-09-23 Schlafhorst & Co W Elektrische Fadenwaechtereinrichtung fuer Zettelgatter
US2400529A (en) * 1944-10-28 1946-05-21 Pathe Tool Mfg Co Inc Automatic stop device for sewing machines
DE1142139B (de) * 1958-08-22 1963-01-03 Rueti Ag Maschf Fadenwaechter fuer Textilmaschinen
US3850122A (en) * 1972-03-25 1974-11-26 Metalmeccanica Spa Broken threads detecting device in embroidery machines
FR2255246A2 (en) * 1973-10-16 1975-07-18 Lindwasser Georges Electronic thread protector - for industrial sewing machine with any number of threads
CH597080A5 (en) * 1975-10-01 1978-03-31 Saurer Ag Adolph Contactor for electric or electronic thread monitor
US4229628A (en) * 1977-08-17 1980-10-21 Karl Mayer Textilmaschinenfabrik Gmbh Combined damper and thread breakage sensor for textile machines
DE3406761A1 (de) * 1983-03-21 1984-10-04 Aktiengesellschaft Adolph Saurer, Arbon Nadelfadenwaechter fuer stickmaschinen
DE4142078A1 (de) * 1991-01-04 1992-07-09 Benninger Ag Maschf Fadenwaechter fuer die ueberwachung der fadenspannung an textilmaschinen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE665364C (de) * 1933-11-25 1938-09-23 Schlafhorst & Co W Elektrische Fadenwaechtereinrichtung fuer Zettelgatter
US2400529A (en) * 1944-10-28 1946-05-21 Pathe Tool Mfg Co Inc Automatic stop device for sewing machines
DE1142139B (de) * 1958-08-22 1963-01-03 Rueti Ag Maschf Fadenwaechter fuer Textilmaschinen
US3850122A (en) * 1972-03-25 1974-11-26 Metalmeccanica Spa Broken threads detecting device in embroidery machines
FR2255246A2 (en) * 1973-10-16 1975-07-18 Lindwasser Georges Electronic thread protector - for industrial sewing machine with any number of threads
CH597080A5 (en) * 1975-10-01 1978-03-31 Saurer Ag Adolph Contactor for electric or electronic thread monitor
US4229628A (en) * 1977-08-17 1980-10-21 Karl Mayer Textilmaschinenfabrik Gmbh Combined damper and thread breakage sensor for textile machines
DE3406761A1 (de) * 1983-03-21 1984-10-04 Aktiengesellschaft Adolph Saurer, Arbon Nadelfadenwaechter fuer stickmaschinen
DE4142078A1 (de) * 1991-01-04 1992-07-09 Benninger Ag Maschf Fadenwaechter fuer die ueberwachung der fadenspannung an textilmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1098025A1 (fr) * 1999-11-05 2001-05-09 Franz Lässer AG Barre de casse-fil
KR20020074133A (ko) * 2002-09-04 2002-09-28 남명규 자수기의 절사 감지장치
EP1489214A1 (fr) * 2003-06-16 2004-12-22 Franz Lässer AG Dispositif de retenue de fil et barre de dispositifs de retenue de fil

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