CH419928A - Device for electrical thread monitoring for textile machines - Google Patents
Device for electrical thread monitoring for textile machinesInfo
- Publication number
- CH419928A CH419928A CH1650664A CH1650664A CH419928A CH 419928 A CH419928 A CH 419928A CH 1650664 A CH1650664 A CH 1650664A CH 1650664 A CH1650664 A CH 1650664A CH 419928 A CH419928 A CH 419928A
- Authority
- CH
- Switzerland
- Prior art keywords
- thread
- magnetic field
- switching
- magnet
- contact
- Prior art date
Links
Classifications
-
- 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
- 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
- B65H63/032—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 electrical or pneumatic
- B65H63/0321—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 electrical or pneumatic using electronic actuators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
- H01H36/0006—Permanent magnet actuating reed switches
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Push-Button Switches (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Looms (AREA)
Description
Einrichtung zur elektrischen Fadenüberwachung für Textilmaschinen
Die Erfindung betrifft eine Einrichtung zur elektrischen Fadenüberwachung für Textilmaschinen mit Fadenwächtern, die durch ihre bei Fadenbruch eintretende Lageveränderung einen auf einen Überwachungsstromkreis einwirkenden Schaltvorgang auslösen.
Bekanntlich haben rein mechanisch arbeitende Fadenwächter den Nachteil, dass die Zeitspanne zwischen ihrer Freigabe bei Fadenbruch und dem dadurch ausgelösten Stillsetzvorgang verhältnismässig gross ist. Bei Hochleistungsmaschinen mit grossen Fadengeschwindigkeiten setzt man deshalb die viel schneller reagierenden elektrischen Fadenwächter ein, um zu verhindern, dass das abgerissene oder ausgelaufene Fadenende die Verarbeitungsstelle passiert, und um vorher einen neuen Faden anknüpfen zu können. Diese elektrischen Fadenwächter lösen bei Fadenbruch einen auf einen überwachungsstromkreis einwirkenden Schaltvorgang aus, der den gewünschten Stillsetzvorgang zur Folge hat. Nach Beseitigung der Störung wird dann die Maschine oder das betreffende Aggregat wieder eingeschaltet.
Diese bekannten elektrischen Fadenwächter haben aber den Nachteil, dass die Kontakte durch Faserflug verstauben oder infolge der in vielen Textilbetrieben betriebsbedingten hohen Luftfeuchtigkeit zur Korrosion neigen und damit versagen.
Da für das Abtasten der Fäden oft nur wenige Gramm zugelassen sind, um zu vermeiden, dass die Fäden durch die Fadenüberwachung selbst zu Bruch gebracht werden, ist es nicht möglich, diese Störanfälligkeit etwa durch höheren Anpressdruck der unmittelbar von den Fadenwächtern getragenen Kontakte zu beseitigen.
Um den genannten Nachteilen bzw. Schwierigkeiten zu begegnen, dient bei der Einrichtung zur elektrischen Fadenüberwachung nach der Erfindung als Schaltorgan jeweils ein gekapselter, magnetfeldempfindlicher Schaltkontakt und es ist jeder Fadenwächter so ausgebildet, dass er durch seine Lageveränderung eine den Schaltvorgang auslösende Änderung eines auf diesen Schaltkontakt einwirkenden Magnetfeld es bewirkt. Je nach den Betriebserfordernissen kann der Schaltkontakt dabei geöffnet oder geschlossen werden.
Derartige Schaltkontakte sind an sich bekannt, so dass die Verwirklichung der Erfindung dem Fachmann keine Schwierigkeiten bereitet. Die solche Kontakte umschliessenden Kapseln sind entweder luftleer oder enthalten ein korrosionsverhütendes Schutzgas. Ausserdem besteht bei der erfindungsgemässen Faden überwachung zwischen der Abtastkraft der Fadenwächter und dem in Abhängigkeit von ihrer Auslösung wirksamen Kontaktdruck kein funktioneller Zusammenhang, so dass beide Werte optimal gewählt werden können.
Die Zeichnung bezieht sich auf ein Ausführungsbeispiel einer im Sinne der Erfindung ausgestalteten Einrichtung zur Fadenüberwachung, wobei jedoch nur eine einzige Überwachungsstelle dargestellt ist und auch der bekannte Überwachungsstromkreis nicht ausgeführt ist. Fig. 1 zeigt den Fadenwächter in Bereitschaftsstellung und Fig. 2 bei Fadenunterbrechung.
Der Faden 1 wird auf dem Weg zwischen seiner nicht dargestellten Ablaufspule und der ebenfalls nicht dargestellten Verarbeitungsstelle in bekannter Weise unter Spannung gehalten. Zwischen den beiden Stützstäben 2 wird er durch den Fadenwächter 3 abgetastet, der auf der ortsfesten Achse 4 drehbar gelagert ist und an seinem anderen Ende einen permanenten Magnet 5 trägt. Als Schaltorgan dient ein gekapselter, magnetfeldempfindlicher Schaltkontakt 6.
In der in Fig. 1 gezeigten Stellung des Fadenwächters 3 wird der Magnet 5 durch die Spannung des Fadens 1 in solcher Lage gehalten, dass das am Ort des Schaltkontaktes 6 wirksame Magnetfeld viel zu schwach ist, um den Kontakt zu betätigen. Wird jedoch der Faden unterbrochen, so ändert durch die Freigabe des Fadenwächters 3 der Magnet 5 seine Lage gegenüber dem Schaltkontakt 6 derart, dass nunmehr auf diesen ein starkes Magnetfeld einwirkt und er dadurch geschlossen wird (Fig. 2).
Selbstverständlich könnte die mechanische Vorspannung des Fadenwächters statt durch das Gewicht des Magneten auch in bekannter Weise durch eine Feder bewirkt werden. Die Anordnung könnte auch so getroffen sein, dass der Magnet in der Bereitschaftsstellung des Fadenwächters auf den Schaltkontakt einwirkt und bei Fadenunterbrechung von diesem weggeschwenkt wird.
Die Erfindung könnte ferner z. B. auch in der Weise verwirklicht werden, dass das Magnetfeld durch einen gegenüber dem Schaltkontakt fest angeordneten Magneten hervorgerufen wird. Dabei trägt der Fadenwächter ein ferromagnetisches Bauelement, z. B. ein Stück Weicheisen, und das am Ort des Schaltkontaktes wirksame Magnetfeld wird durch die Lageänderung dieses Bauelementes gegenüber dem Magneten und dem Schaltkontakt geändert.
Device for electrical thread monitoring for textile machines
The invention relates to a device for electrical thread monitoring for textile machines with thread monitors which, when the thread breaks, trigger a switching process acting on a monitoring circuit.
It is known that thread monitors that operate purely mechanically have the disadvantage that the time span between their release in the event of thread breakage and the shutdown process triggered thereby is relatively large. In high-performance machines with high thread speeds, the much faster reacting electric thread monitors are used to prevent the torn or leaked thread end from passing the processing point and to be able to tie a new thread beforehand. In the event of a thread break, these electrical thread monitors trigger a switching process that acts on a monitoring circuit, which results in the desired shutdown process. After the malfunction has been eliminated, the machine or the relevant unit is switched on again.
However, these known electrical thread monitors have the disadvantage that the contacts get dusty due to the fluff of fibers or tend to corrode due to the operationally high humidity in many textile companies and thus fail.
Since only a few grams are often allowed for scanning the threads, in order to avoid the threads being broken by the thread monitor itself, it is not possible to eliminate this susceptibility to failure, for example by applying higher pressure to the contacts directly carried by the thread monitors.
In order to counter the disadvantages or difficulties mentioned, an encapsulated, magnetic field-sensitive switching contact is used as the switching element in the device for electrical thread monitoring according to the invention, and each thread monitor is designed so that, by changing its position, it triggers a switching process change on this switching contact acting magnetic field causes it. Depending on the operating requirements, the switching contact can be opened or closed.
Such switching contacts are known per se, so that the implementation of the invention does not present any difficulties for the person skilled in the art. The capsules surrounding such contacts are either evacuated or contain a protective gas that prevents corrosion. In addition, in the thread monitoring system according to the invention, there is no functional relationship between the scanning force of the thread monitors and the contact pressure that is effective as a function of its release, so that both values can be optimally selected.
The drawing relates to an exemplary embodiment of a device for thread monitoring designed in accordance with the invention, although only a single monitoring point is shown and the known monitoring circuit is also not implemented. Fig. 1 shows the thread monitor in the ready position and Fig. 2 with thread interruption.
The thread 1 is kept under tension in a known manner on the way between its pay-off bobbin (not shown) and the processing point (also not shown). Between the two support rods 2 it is scanned by the thread monitor 3, which is rotatably mounted on the stationary axle 4 and carries a permanent magnet 5 at its other end. An encapsulated, magnetic field-sensitive switching contact 6 serves as the switching element.
In the position of the thread monitor 3 shown in FIG. 1, the magnet 5 is held by the tension of the thread 1 in such a position that the magnetic field effective at the location of the switching contact 6 is much too weak to actuate the contact. However, if the thread is interrupted, the release of the thread monitor 3 causes the magnet 5 to change its position relative to the switching contact 6 in such a way that a strong magnetic field now acts on it and it is closed as a result (FIG. 2).
Of course, the mechanical pre-tensioning of the thread monitor could also be brought about in a known manner by a spring instead of the weight of the magnet. The arrangement could also be made in such a way that the magnet acts on the switching contact in the standby position of the thread monitor and is swiveled away from it when the thread is interrupted.
The invention could also e.g. B. can also be realized in such a way that the magnetic field is caused by a magnet fixedly arranged opposite the switching contact. The thread monitor carries a ferromagnetic component, e.g. B. a piece of soft iron, and the effective magnetic field at the location of the switch contact is changed by the change in position of this component relative to the magnet and the switch contact.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH900466A CH455595A (en) | 1964-12-21 | 1966-06-21 | Device for electrical thread monitoring for textile machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEH0051553 | 1964-01-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH419928A true CH419928A (en) | 1966-08-31 |
Family
ID=7157729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1650664A CH419928A (en) | 1964-01-10 | 1964-12-21 | Device for electrical thread monitoring for textile machines |
Country Status (6)
Country | Link |
---|---|
AT (1) | AT254002B (en) |
BE (1) | BE657931A (en) |
CH (1) | CH419928A (en) |
DE (1) | DE1560379A1 (en) |
FR (1) | FR1420293A (en) |
GB (1) | GB1020086A (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT268941B (en) * | 1966-03-19 | 1969-02-25 | Vyzk Ustav Bavlnarsky | Thread breakage monitoring device |
CH478264A (en) * | 1966-08-09 | 1969-09-15 | Luwa Ag | Method for monitoring the roving on wing spinning machines |
US3763702A (en) * | 1970-07-09 | 1973-10-09 | Burlington Industries Inc | Ends down monitoring |
DE3114919A1 (en) * | 1981-04-13 | 1982-10-28 | Zinser Textilmaschinen Gmbh, 7333 Ebersbach | Appliance for impeding or blocking the propagation of the twist of threads |
FR2508882B1 (en) * | 1981-07-06 | 1985-08-16 | Inst Textile De France | SYSTEM FOR DETECTING THE PRESENCE OF THREADS ON A SPINNING CONTINUOUS |
CN101517139B (en) * | 2006-06-21 | 2013-01-02 | 梅明格-Iro股份有限公司 | yarn detector |
DE102008021218A1 (en) * | 2008-04-28 | 2009-10-29 | TRüTZSCHLER GMBH & CO. KG | Monitoring device for at least one running sliver at a drafting of a textile machine, eg. Track, card, combing machine o. |
CN103264930B (en) * | 2013-05-24 | 2016-03-30 | 江苏千里马袜业有限公司 | A kind of wire passing device of yarn |
CN104071644A (en) * | 2014-06-12 | 2014-10-01 | 吴江久美微纤织造有限公司 | Broken yarn alarming yarn guide ring |
-
1964
- 1964-01-10 DE DE19641560379 patent/DE1560379A1/en active Pending
- 1964-12-21 CH CH1650664A patent/CH419928A/en unknown
-
1965
- 1965-01-05 BE BE657931D patent/BE657931A/xx unknown
- 1965-01-06 FR FR45466A patent/FR1420293A/en not_active Expired
- 1965-01-06 GB GB50765A patent/GB1020086A/en not_active Expired
- 1965-01-08 AT AT9465A patent/AT254002B/en active
Also Published As
Publication number | Publication date |
---|---|
DE1560379A1 (en) | 1970-07-16 |
AT254002B (en) | 1967-05-10 |
GB1020086A (en) | 1966-02-16 |
BE657931A (en) | 1965-04-30 |
FR1420293A (en) | 1965-12-03 |
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