EP0252952A1 - Device for measuring the thickness of slivers. - Google Patents

Device for measuring the thickness of slivers.

Info

Publication number
EP0252952A1
EP0252952A1 EP87900630A EP87900630A EP0252952A1 EP 0252952 A1 EP0252952 A1 EP 0252952A1 EP 87900630 A EP87900630 A EP 87900630A EP 87900630 A EP87900630 A EP 87900630A EP 0252952 A1 EP0252952 A1 EP 0252952A1
Authority
EP
European Patent Office
Prior art keywords
measuring
bar
sliver
leaf spring
measuring bar
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.)
Granted
Application number
EP87900630A
Other languages
German (de)
French (fr)
Other versions
EP0252952B1 (en
Inventor
Werner Grunder
Francois Baechler
Erwin Murbach
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.)
Uster Technologies AG
Original Assignee
Zellweger Uster 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 Zellweger Uster AG filed Critical Zellweger Uster AG
Priority to AT87900630T priority Critical patent/ATE52113T1/en
Publication of EP0252952A1 publication Critical patent/EP0252952A1/en
Application granted granted Critical
Publication of EP0252952B1 publication Critical patent/EP0252952B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/22—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material
    • 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
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • 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 invention relates to a device for measuring the sliver thickness and the non-uniformity of fiber slivers, preferably on spinning preparation machines, with a compression element compacting the fiber sliver and with a compression element arranged thereon, mechanically scanning the compressed fiber sliver in a measuring channel and by means of a strain gauge provided leaf spring formed measuring member for the thickness and the unevenness of the sliver.
  • the measuring channel is provided in a wall integrally connected to the outlet opening of the compression member formed by a band funnel, and the leaf spring is fastened to the band funnel and extends along a generatrix of the band funnel.
  • the aim of the invention is to improve this known device in such a way that even very short non-uniformities can be measured at high tape speed and that a simple range adaptation to changing tape numbers can be carried out.
  • the measuring channel is provided in a measuring part which is interchangeably arranged on the compression member and in that the measuring part is equipped with a compressed air connection.
  • the arrangement of the measuring channel in a measuring part that can be replaced on the compression element has the advantage that it is no longer necessary to replace the entire compression element, but only the named component or even only a part of it, in order to adapt to changing band numbers.
  • the compressed air connection offers the possibility of blowing out deposited dust and / or cooling the measuring point.
  • FIG. 1 shows a longitudinal section through a first exemplary embodiment of a
  • FIG. 2 shows a view in the direction of arrow II of FIG. 1
  • FIG. 3 shows a view in the direction of arrow III of FIG. 2
  • FIGS. 4-6 details of the measuring part of FIGS. 1 to 3
  • 6a shows a schematic illustration for the purpose of function explanation
  • FIG. 7 shows a longitudinal section through a second exemplary embodiment of a
  • Band funnel, 8 is a view in the direction of arrow A of FIG. 7,
  • FIG. 9 is a plan view of the stop part of a measuring part suitable for the band funnel of FIG. 7,
  • FIG. 11 is a plan view of a leaf spring with its carrier
  • Fig. 12 is a section along the line C-C of Fig. 11, and
  • FIG. 13 shows a section along the line E-E of FIG. 12.
  • Figs. 1 to 3 is a first embodiment of the compaction: processing a sliver funnel serving tape T with a hopper wall 1 and an inlet and an outlet opening 2 and 3 respectively.
  • band funnels are known and are used in particular on draw frames or cards; on lines, for example, in the direction of flow after the drafting system and / or in front of a pair of calender rollers.
  • the band funnel can be assigned, for example, to the can stock, or it can be provided to combine the card fleece.
  • the band funnel T has a step into which a measuring part MT having a measuring channel 4 is inserted.
  • This consists of two parts, namely a channel part 5 and a stop part 6, between which a leaf spring BF is clamped.
  • the leaf spring BF serves as a measuring element for the thickness of a sliver running through the band funnel 1 and the measuring channel 4.
  • FIGS. 5 and 6 each show a view of the clamping surface of the channel spring facing the leaf spring BF. partly 5 or the stop part 6.
  • the structure of the measuring part MT will now be explained with reference to FIGS. 1 to 6, the scale being 4: 1 in each case.
  • the channel part 5 is approximately plate-shaped and has on its clamping surface the measuring channel 4 provided with a conical inlet part, which is formed by a groove in the channel part 5.
  • the channel part 5 is provided with a centering rib 7 which extends transversely to the measuring channel 4 and which is latched into a corresponding groove in the graduation of the band funnel T.
  • the fixation in the third coordinate direction is carried out by means of two screws 8 which pass through corresponding bores 9 of the stop part 6 and slots 10 and 11 in the leaf spring BF or in the channel part 5 pushed and screwed into threaded holes 12 of the band funnel T.
  • the measuring part can be replaced by simply loosening and tightening the screws 8 and thus the parts from the belt funnel T and the measuring element! MT existing device can be easily adapted to changing band numbers.
  • the leaf spring BF consists of a representation (see in particular FIG. 4) of a measuring bar 13 and two torsion bars 14, by means of which the measuring bar 13 is fastened to a connecting part 15.
  • the from the The parts called leaf spring BF are made in one piece and are clamped between the channel part 5 and the stop part 6 at the two points 16 marked by hatching in FIG. 4 in the transition region between the connecting part 15 and torsion bars 14.
  • the measuring bar 13 of the Blattfe ⁇ of the BF lies across the measuring channel 4 and is prevented at its ends by two contact surfaces 17 of the stop part 6 from pivoting away from the measuring channel 4.
  • a fiber band coming from the band hopper 1 and running through the measuring channel 4 is compressed by the measuring bar 13 in the measuring channel 4 and generates a pressure on the measuring bar 13, the absolute value of which increases reproducibly with increasing band thickness.
  • Each change in the strip thickness causes a corresponding change in this pressure and the force acting on the measuring beam 13.
  • the measuring bar 13 cannot pivot away from the measuring channel 4, but instead undergoes deflection, and in the measuring bar 13 there is a positive expansion on one surface and a negative expansion on its other surface, which is proportional to the force acting and thus a measure for the tape thickness is.
  • the mechanical great expansion is converted into an electrical magnitude by means of strain gauges arranged on the measuring bar 13 (see FIG. 6a).
  • the support surfaces 17 are less than 1 mm in front of the web of the stop part 6 connecting them.
  • the maximum possible deflection of the measuring beam 13 is limited to this distance and the web mentioned acts between the two stop surfaces 17 as a stop against overstretching or overstressing.
  • a tube or nipple 18 is attached to the stop part 6 on both side walls transversely to the measuring channel 4 of the channel part 5.
  • the tubes are each fastened in a bore 19 which penetrates the corresponding side wall.
  • One of the tubes 18 serves to supply the electrical connections, the other enables the measuring part MT to be easily cleaned and cooled by means of compressed air. Here er ⁇ cleaning by intermittent and cooling followed by constant 'supply of compressed air.
  • the two torsion bars 14, which position the measuring bar 13 and determine its pivot point, additionally fulfill the further important task of preventing the cracking effect when the measuring bar 13 is locally heated by the continuous sliver and thus prevent the occurrence of mechanical stresses as a result of temperature fluctuations. So that the measuring bar 13 is not worn out by the fiber tape, it is provided on its side contacting the fiber tape with a pressure plate 20 made of hard metal or ceramic, which is applied to the measuring bar 13. In addition to the strain gauges, a temperature sensor can also be provided on the measuring bar 13 or in its area to take account of any temperature fluctuations.
  • FIG. 6a shows the basic arrangement of the strain gauges on the measuring bar 13 and the evaluation of their signals.
  • the figure schematically shows the measuring bar 13 supported against the abutment surfaces 17, on the pressure plate 20 of which a force F would act through a sliver.
  • a force F would act through a sliver.
  • To evaluate the resulting strain on the two Surfaces of the measuring bar 13 are arranged on each of these two strain gauges D1 and D3 or D2 and D4.
  • strain gauges lie symmetrically to the intended point of application of the force F in the middle of the measuring channel 4 (FIG. 5). This ensures that interfering effects caused by friction of the fiber sliver are fully compensated for by the ambient temperature or by local heating of the measuring bar 13.
  • Each strain gauge D1 to D4 has a certain electrical resistance Rl to R4, these resistances being all the same. Since the relative change in resistance when the measuring beam 13 bends is known to be proportional to the strain of the strain gauges, the determination of the strain can be made by measuring this change in resistance. This is done with the help of a Wheatstone bridge circuit, which consists of four branches, which are formed by the ring-shaped interconnected resistors Rl to R4. If a supply voltage UE is now applied to the connection points between the resistors R4 and Rl on the one hand and R2 and R3 on the other hand, then an output voltage UA proportional to the bridge detuning can be tapped, which in turn is the sum of the strain of the individual strain gauges D! until D4 is proportional.
  • the measuring bar 13 Since the measuring bar 13 is relatively short and has a high spring constant and small mass, it has a very high natural frequency and enables the measurement of very short non-uniformities in the strip thickness at a high one Throughput speed of the sliver. Further advantages of the device described are the following:
  • the measuring member is largely independent of fluctuations in the fiber fineness of the fiber sliver.
  • FIGS. 7 to 13 show a second exemplary embodiment of a band funnel T 1 (FIGS. 7, 8), a stop part 6 ′ (FIGS. 9, 10) suitable for use with this and a suitable leaf spring BF ′ (FIG 11-13):
  • the scale in FIGS. 7 and 82 is 1: 5: 1 in FIGS. 9-13.
  • the band funnel T 1 is basically the same as the band funnel T shown in FIGS. 1 to 3 and has an outlet opening 3 'of approximately oval or elongated cross section as the main difference with respect to the latter. This shape leads to a corresponding deformation of the cross section of the fiber sliver, so that the leaf spring no longer lies tangentially to it but along a side surface.
  • the band funnel T ' also has a step following the outlet opening 3', in which a measuring part is inserted and fixed by screws (not shown). While in the measuring part MT of the first exemplary embodiment (FIGS. 1-6), with reference to FIG. 1, the channel part 5 is at the bottom and the stop part 6 is at the top, this is reversed in the second exemplary embodiment from FIGS. 7 to 13.
  • the striking part lies directly on the graduation of the band funnel T '! 6 '(FIGS. 9, 10) on and above this the channel part is arranged.
  • the leaf spring BF '(Fig. 11-13) is clamped between these two parts. Which of the two parts, channel part or stop part, lies directly on the gradation of the band funnel T or T 'is not essential to the invention.
  • the channel part of the second embodiment practically corresponds to the channel part 5 (FIG. 1) of the first embodiment and is therefore not shown.
  • the stop part and in the leaf spring between the two exemplary embodiments, which are now to be explained with reference to FIGS. 9-13. Since the leaf springs in particular are different, the leaf spring should first be described.
  • the leaf spring BF ' essentially consists of a thicker support part 21 forming the edge part thereof and a measuring bar 13', which has one end face directly and another end with a torsion bar 14 ' the carrier part 21 is connected. Since the leaf spring BF 'is also made from one piece, "connected” does not of course refer to one in this context Connection of two different parts but the boundary of two areas of the same part.
  • the leaf spring BF ' has two holes 22 for the screws 8 (FIG. 1) corresponding fastening screws for coarse adjustment in the measuring part. The fine adjustment is carried out by screws (not shown) which are guided in a second pair of bores 23 and screwed into corresponding threads 24 of the stop part 6 '(FIG. 9).
  • the measuring bar 13 ' has a thickening 25 with the pressure plate 20 on its area contacting the fiber sliver which is passing through and is to be measured.
  • the four strain gauges are arranged on the surface of the measuring bar 13 'facing away from the pressure plate 20, preferably in the area between the thickening 25 and the end of the measuring bar 13 merging into the carrier part 21.
  • the stop part 6 ' (FIGS. 9, 10) is correspondingly adapted to the leaf spring BF' and has on its edge an approximately U-shaped support surface 26 for the leaf spring BF 'and in the area of the measuring bar! 3' one against it Contact surface 26 reset gradation 27.
  • the gradation 27 is divided in two by a web 28 arranged in the area of the pressure plate 20 (FIG. 11). The web 28 projects beyond the step 27, but lies deeper than the bearing surface 26 and forms a stop limiting the deflection of the measuring beam 13 '.
  • the stop part 6 ' also has two chamber-like cutouts 29 and 30.
  • the electrical connections of the strain gauges are guided through this tube 18 via chamber 30 and gradation 27 to the outside.
  • a nipple is fastened (not shown), through which compressed air is blown from outside into the stop part 6 'for cleaning and cooling the measuring point, which is sent via the chamber 29 and the web 28 over the Measuring bar 13 'arrives.
  • the leaf spring BF ' has larger dimensions than the corresponding surface of the stop part 6'. This is due to the fact that the leaf spring BF 'matching the illustrated stop part 6' only extends up to the line G shown in broken lines at its upper and left edge in FIG. 11. In this case, the leaf spring BF 'has an approximately L-shaped support part 21 and the bore 23 on the left in FIG. 11 is located between the torsion bar 14' and the adjacent bore 22.
  • the variant of the leaf spring BF 'shown in FIGS. 11-13, in the use of which the stop part 6' and of course also the channel part 5 (FIG. 1) would have to be modified accordingly, is characterized in that the measuring bar 13 'and the Torsion bar! 4 'surrounded on all sides by the carrier part 21 and thus optimally protected against external influences. If the leaf spring BF 'has the smaller dimensions indicated by the border G, then both the measuring bar 13' and the torsion bar 14 'lie on the outer edge of the measuring part MT (FIG. 1) and can thereby be damaged by external action. In the leaf spring BF 1 shown in FIGS. 11 to 13, this is precluded by the part 21 'of the carrier part 21 lying outside the border G, which forms a shield for the measuring bar 13' and the torsion bar 14 '.

Abstract

Le dispositif comprend un organe de compression (T) et un organe pour la mesure de l'épaisseur d'un ruban passant à travers un canal de mesure (4). L'organe de mesure est constitué par un ressort à lame (BF) muni d'une jauge de contrainte. Le canal de mesure (4) est disposé dans une tête de mesure (MT) échangeable sur un entonnoir (T). Cette tête de mesure présente un raccord (19) pour l'alimentation en air sous pression. Cette construction permet, d'une part, une adaptation aisée du dispositif aux différents numéros de rubans et, d'autre part, un nettoyage et un refroidissement faciles de la tête de mesure.The device comprises a compression member (T) and a member for measuring the thickness of a ribbon passing through a measuring channel (4). The measuring device consists of a leaf spring (BF) fitted with a strain gauge. The measuring channel (4) is arranged in a measuring head (MT) which can be exchanged on a funnel (T). This measuring head has a connection (19) for the pressurized air supply. This construction allows, on the one hand, easy adaptation of the device to the different tape numbers and, on the other hand, easy cleaning and cooling of the measuring head.

Description

Vorrichtung zum Messen der Banddicke von FaserbändernDevice for measuring the sliver thickness of slivers
Beschreibungdescription
Die Erfindung betrifft eine Vorrichtung zum Messen der Banddicke und der Ungleichmässigkeit von Faserbändern, vorzugsweise an Spinnereivorberei- tungsmaschinen, mit einem das Faserband verdichtenden Verdichtungsorgan und mit einem an diesem angeordneten, das verdichtete Faserband in einem Mess¬ kanal mechanisch abtastenden und durch eine mit einem Dehnungsmessstreifen versehene Blattfeder gebildeten Messorgan für die Dicke und die Ungleich¬ mässigkeit des Faserbandes.The invention relates to a device for measuring the sliver thickness and the non-uniformity of fiber slivers, preferably on spinning preparation machines, with a compression element compacting the fiber sliver and with a compression element arranged thereon, mechanically scanning the compressed fiber sliver in a measuring channel and by means of a strain gauge provided leaf spring formed measuring member for the thickness and the unevenness of the sliver.
Bei einer in der DE-PS 15 10487 beschriebenen Vorrichtung dieser Art ist der Messkanal in einer an die Austrittsöffnung des durch einen Bandtrichter gebildeten Verdichtungsorgans einstückig anschliessenden Wandung vorgesehen und die Blattfeder ist am Bandtrichter befestigt und erstreckt sich entlang einer Erzeugenden des Bandtrichters.In a device of this type described in DE-PS 15 10487, the measuring channel is provided in a wall integrally connected to the outlet opening of the compression member formed by a band funnel, and the leaf spring is fastened to the band funnel and extends along a generatrix of the band funnel.
Letzteres hat eine gewisse Trägheit des Messorgans zur Folge; ausserdem muss für eine Anpassung an wechselnde Bandnummern stets der gesamte Band¬ trichter ausgewechselt werden. Durch die Erfindung soll nun diese bekannte Vorrichtung dahingehend verbes¬ sert werden, dass auch sehr kurze Ungleichmässigkeiten bei hoher Bandge¬ schwindigkeit gemessen werden können und dass eine einfache Bereichsanpas¬ sung an wechselnde Bandnummern vorgenommen werden kann.The latter results in a certain inertia of the measuring element; in addition, the entire band funnel must always be replaced in order to adapt to changing band numbers. The aim of the invention is to improve this known device in such a way that even very short non-uniformities can be measured at high tape speed and that a simple range adaptation to changing tape numbers can be carried out.
Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass der Messkanal in einem am Verdichtungsorgan auswechselbar angeordneten Messteil vorgesehen und dass der Messteil mit einem Druck!uftanschluss ausgerüstet ist.This object is achieved according to the invention in that the measuring channel is provided in a measuring part which is interchangeably arranged on the compression member and in that the measuring part is equipped with a compressed air connection.
Die Anordnung des Messkanals in einem am Verdichtungsorgan auswechselbaren Messteil hat den Vorteil, dass für die Anpassung an wechselnde Bandnummern nicht mehr das gesamte Verdichtungsorgan, sondern lediglich der genannte Bauteil oder sogar nur ein Teil von diesem ausgewechselt zu werden braucht. Der Druck!uftanschluss bietet die Möglichkeit der Ausblasung von sich abla¬ gerndem Staub und/oder der Kühlung der Messstelle.The arrangement of the measuring channel in a measuring part that can be replaced on the compression element has the advantage that it is no longer necessary to replace the entire compression element, but only the named component or even only a part of it, in order to adapt to changing band numbers. The compressed air connection offers the possibility of blowing out deposited dust and / or cooling the measuring point.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnun¬ gen näher erläutert. Es zeigt: Fig. 1 einen Längsschnitt durch ein erstes Ausführungsbeispiels einesAn embodiment of the invention is explained in more detail below with reference to the drawings. 1 shows a longitudinal section through a first exemplary embodiment of a
Bandtrichters mit einem Messorgan, Fig. 2 eine Ansicht in Richtung des Pfeils II von Fig. 1, Fig. 3 eine Ansicht in Richtung des Pfeils III von Fig. 2, Fig. 4-6 Details des Messteils der Fig. 1 bis 3, Fig. 6a eine schematische Darstellung zur Funktionserl uterung, Fig. 7 einen Längsschnitt durch ein zweites Ausführungsbeispiels einesBand funnel with a measuring element, FIG. 2 shows a view in the direction of arrow II of FIG. 1, FIG. 3 shows a view in the direction of arrow III of FIG. 2, FIGS. 4-6 details of the measuring part of FIGS. 1 to 3, 6a shows a schematic illustration for the purpose of function explanation, FIG. 7 shows a longitudinal section through a second exemplary embodiment of a
Bandtrichters, Fig. 8 eine Ansicht in Richtung des Pfeiles A von Fig. 7,Band funnel, 8 is a view in the direction of arrow A of FIG. 7,
Fig. 9 eine Draufsicht auf den Anschlagteil eines für den Bandtrichter von Fig. 7 geeigneten Messteils,9 is a plan view of the stop part of a measuring part suitable for the band funnel of FIG. 7,
Fig. 10 einen Schnitt nach der Linie B-B von Fig.- 9,10 is a section along the line B-B of Fig. 9,
Fig. 11 eine Draufsicht auf eine Blattfeder mit ihrem Träger,11 is a plan view of a leaf spring with its carrier,
Fig. 12 einen Schnitt nach der Linie C-C von Fig. 11, undFig. 12 is a section along the line C-C of Fig. 11, and
Fig. 13 einen Schnitt nach der Linie E-E von Fig. 12.13 shows a section along the line E-E of FIG. 12.
In den Fig. 1 bis 3 ist ein erstes Ausführungsbeispiel eines der Verdich-: tung eines Faserbandes dienenden Bandtrichters T mit einer Trichterwandung 1 und einer Einlauf- und einer Austrittsöffnung 2 bzw. 3 dargestellt. Der¬ artige Bandtrichter sind bekannt und werden insbesondere an Strecken oder Karden verwendet; an Strecken beispielsweise in Durchlaufrichtung nach dem Streckwerk und/oder vor einem Kalanderwalzenpaar. Bei Karden kann der Band¬ trichter beispielsweise dem Kannenstock zugeordnet oder er kann zum Zusam¬ menfassen des Kardenvlieses vorgesehen sein.In Figs. 1 to 3 is a first embodiment of the compaction: processing a sliver funnel serving tape T with a hopper wall 1 and an inlet and an outlet opening 2 and 3 respectively. Such band funnels are known and are used in particular on draw frames or cards; on lines, for example, in the direction of flow after the drafting system and / or in front of a pair of calender rollers. In the case of cards, the band funnel can be assigned, for example, to the can stock, or it can be provided to combine the card fleece.
Der Bandtrichter T weist im Anschluss an die Austrittsöffnung 3 eine Abstu¬ fung auf, in welche ein einen Messkanal 4 aufweisender Messteil MT einge¬ setzt ist. Dieser besteht aus zwei Teilen, und zwar aus einem Kanalteil 5 und aus einem Anschlagteil 6, zwischen denen eine Blattfeder BF eingespannt ist. Die Blattfeder BF dient als Messorgan für die Dicke eines durch den Bandtrichter 1 und den Messkanal 4 laufenden Faserbandes.Following the outlet opening 3, the band funnel T has a step into which a measuring part MT having a measuring channel 4 is inserted. This consists of two parts, namely a channel part 5 and a stop part 6, between which a leaf spring BF is clamped. The leaf spring BF serves as a measuring element for the thickness of a sliver running through the band funnel 1 and the measuring channel 4.
Fig. 4 zeigt eine Ansicht der Blattfeder BF und die Figuren 5 und 6 zeigen je eine Ansicht der der Blattfeder BF zugewandten Klemmfläche des Kanal- teils 5 bzw. des Änschlagteils 6. Der Aufbau des Messteils MT wird nun an¬ hand der Figuren 1 bis 6 erläutert, wobei der Massstab jeweils 4:1 beträgt.4 shows a view of the leaf spring BF and FIGS. 5 and 6 each show a view of the clamping surface of the channel spring facing the leaf spring BF. partly 5 or the stop part 6. The structure of the measuring part MT will now be explained with reference to FIGS. 1 to 6, the scale being 4: 1 in each case.
Der Kanalteil 5 ist von annähernd plattenför iger Gestalt und weist an sei¬ ner Klemmfläche den mit einem kegeligen Einlaufteil versehenen Messkanal 4 auf, welcher durch eine Nut im Kanalteil 5 gebildet ist. An der gegenüber¬ liegenden Fläche ist der Kanalteil 5 mit einer quer zum Messkanal 4 verlau¬ fenden Zentrierrippe 7 versehen, welche in eine entsprechende Nut in der Abstufung des Bandtrichters T eingerastet ist. Dadurch ist der Kanalteil 5 und mit ihm der ganze Messteil MT relativ zum Bandtrichter T in zwei Koor¬ dinatenrichtungen fixiert. Die Fixierung in der dritten Koordinatenrich¬ tung, das ist in Fig. 1 die Richtung senkrecht zur Zeichnungsebene, erfolgt mittels zweier Schrauben 8, welche durch entsprechende Bohrungen 9 des An¬ schlagteils 6 und Schlitze 10 und 11 in der Blattfeder BF bzw. im Kanalteil 5 gestossen und in Gewindebohrungen 12 des Bandtrichters T eingeschraubt sind.The channel part 5 is approximately plate-shaped and has on its clamping surface the measuring channel 4 provided with a conical inlet part, which is formed by a groove in the channel part 5. On the opposite surface, the channel part 5 is provided with a centering rib 7 which extends transversely to the measuring channel 4 and which is latched into a corresponding groove in the graduation of the band funnel T. As a result, the channel part 5 and with it the entire measuring part MT are fixed in two coordinate directions relative to the band funnel T. The fixation in the third coordinate direction, that is the direction perpendicular to the plane of the drawing in FIG. 1, is carried out by means of two screws 8 which pass through corresponding bores 9 of the stop part 6 and slots 10 and 11 in the leaf spring BF or in the channel part 5 pushed and screwed into threaded holes 12 of the band funnel T.
Da die Schrauben 8 gleichzeitig zur Befestigung des Messteils MT am Band¬ trichter T dienen, kann der Messteil durch blosses Lösen und Anziehen der Schrauben 8 ausgewechselt und somit die aus dem Bandtrichter T und dem Messtei! MT bestehende Vorrichtung einfach an wechselnde Bandnu mern ange- passt werden.Since the screws 8 are used at the same time to fasten the measuring part MT to the belt funnel T, the measuring part can be replaced by simply loosening and tightening the screws 8 and thus the parts from the belt funnel T and the measuring element! MT existing device can be easily adapted to changing band numbers.
Die Blattfeder BF besteht darstellungsge äss (siehe insbesondere Fig. 4) aus einem Messbalken 13 und aus zwei Torsionsstäben 14, durch welche der Messbalken 13 an einem Verbindungsteil 15 befestigt ist. Die aus den ge- nannten Teilen bestehende Blattfeder BF ist einstückig gefertigt und ist an den beiden in Fig. 4 durch eine Schraffur markierten Stellen 16 im Ueber- gangsbereich zwischen Verbindungsteil 15 und Torsionsstäben 14 zwischen Kanalteil 5 und Anschlagteil 6 eingeklemmt. Der Messbalken 13 der Blattfe¬ der BF liegt quer über dem Messkanal 4 und wird dabei an seinen Enden durch zwei Auflageflächen 17 des Anschlagteils 6 am Wegschwenken vom Messkanal 4 gehindert.The leaf spring BF consists of a representation (see in particular FIG. 4) of a measuring bar 13 and two torsion bars 14, by means of which the measuring bar 13 is fastened to a connecting part 15. The from the The parts called leaf spring BF are made in one piece and are clamped between the channel part 5 and the stop part 6 at the two points 16 marked by hatching in FIG. 4 in the transition region between the connecting part 15 and torsion bars 14. The measuring bar 13 of the Blattfe¬ of the BF lies across the measuring channel 4 and is prevented at its ends by two contact surfaces 17 of the stop part 6 from pivoting away from the measuring channel 4.
Ein aus dem Baπdtrichter 1 kommendes, durch den Messkanal 4 laufendes Fa¬ serband wird durch den Messbalken 13 im Messkanal 4 komprimiert und erzeugt auf den Messbalken 13 einen Druck, dessen absoluter Wert mit zunehmender Banddicke reproduzierbar zunimmt. Jede Aenderung der Banddicke bewirkt eine entsprechende Aenderung dieses Druckes und der auf den Messbalken 13 wir¬ kenden Kraft. Zufolge der Anschlagfl che 17 kann der Messbalken 13 nicht vom Messkanal 4 wegschwenken, sondern erfährt eine Durchbiegung und im Messbalken 13 entsteht an seiner einen Oberfläche eine positive und an sei¬ ner anderen Oberfläche eine negative Dehnung, welche zur einwirkenden Kraft proportional und damit ein Mass für die Banddicke ist. Die mechanische Grosse Dehnung wird mittels auf dem Messbalken 13 angeordneter Dehnungs- messtreifen in eine elektrische Grosse umgewandelt (siehe Fig. 6a).A fiber band coming from the band hopper 1 and running through the measuring channel 4 is compressed by the measuring bar 13 in the measuring channel 4 and generates a pressure on the measuring bar 13, the absolute value of which increases reproducibly with increasing band thickness. Each change in the strip thickness causes a corresponding change in this pressure and the force acting on the measuring beam 13. As a result of the abutment surface 17, the measuring bar 13 cannot pivot away from the measuring channel 4, but instead undergoes deflection, and in the measuring bar 13 there is a positive expansion on one surface and a negative expansion on its other surface, which is proportional to the force acting and thus a measure for the tape thickness is. The mechanical great expansion is converted into an electrical magnitude by means of strain gauges arranged on the measuring bar 13 (see FIG. 6a).
Wie insbesondere Fig. 2 entnommen werden kann, liegen die Auflagefl chen 17 weniger als 1 mm vor dem sie verbindenden Steg des Anschlagteils 6. Damit ist die mögliche maximale Durchbiegung des Messbalkens 13 auf diese Distanz begrenzt und der genannte Steg zwischen den beiden Anschlagflächen 17 wirkt als Anschlag gegen Ueberdehnung oder Ueberbeanspruchung. Wie den Fig. 2 und 3 entnommen werden, kann, ist am Anschlagteil 6 an beiden Seitenwänden quer zum Messkanal 4 des Kanalteils 5 je ein Röhrchen oder Nippel 18 angesetzt. Die Röhrchen sind je in einer die entsprechende Sei¬ tenwand durchstossenden Bohrung 19 befestigt. Eines der Röhrchen 18 dient zur Zuführung der elektrischen Anschlüsse, das andere ermöglicht eine ein¬ fache Reinigung und Kühlung des Messteils MT mittels Druckluft. Dabei er¬ folgt die Reinigung durch intermittierende und die Kühlung durch ständige ' Zufuhr von Druckluft.As can be seen in particular in FIG. 2, the support surfaces 17 are less than 1 mm in front of the web of the stop part 6 connecting them. Thus, the maximum possible deflection of the measuring beam 13 is limited to this distance and the web mentioned acts between the two stop surfaces 17 as a stop against overstretching or overstressing. As can be seen from FIGS. 2 and 3, a tube or nipple 18 is attached to the stop part 6 on both side walls transversely to the measuring channel 4 of the channel part 5. The tubes are each fastened in a bore 19 which penetrates the corresponding side wall. One of the tubes 18 serves to supply the electrical connections, the other enables the measuring part MT to be easily cleaned and cooled by means of compressed air. Here er¬ cleaning by intermittent and cooling followed by constant 'supply of compressed air.
Die beiden Torsionsstäbe 14, welche den Messbalken 13 positionieren und dessen Drehpunkt festlegen, erfüllen zusätzlich noch die weitere wichtige Aufgabe der Verhinderung des Knack-Effektes bei einer örtlichen Erwärmung des Messbalkens 13 durch das durchlaufende Faserband und verhindern somit das Auftreten mechanischer Spannungen infolge von Temperaturschwankungen. Damit der Messbalken 13 durch das Faserbaπd nicht abgenützt wird, ist er an seiner das Faserband kontaktierenden Seite mit einem Druckplättchen 20 aus Hartmetall oder Keramik versehen, welches auf den Messbalken 13 appliziert ist. Zusätzlich zu den Dehnungsmessstreifen kann auf dem Messbalken 13 oder in dessen Bereich noch ein Temperaturfühler für die Berücksichtigung etwa¬ iger Temperaturschwankungen vorgesehen sein.The two torsion bars 14, which position the measuring bar 13 and determine its pivot point, additionally fulfill the further important task of preventing the cracking effect when the measuring bar 13 is locally heated by the continuous sliver and thus prevent the occurrence of mechanical stresses as a result of temperature fluctuations. So that the measuring bar 13 is not worn out by the fiber tape, it is provided on its side contacting the fiber tape with a pressure plate 20 made of hard metal or ceramic, which is applied to the measuring bar 13. In addition to the strain gauges, a temperature sensor can also be provided on the measuring bar 13 or in its area to take account of any temperature fluctuations.
In Fig. 6a ist die prinzipielle Anordnung der Dehnungsmessstreifen auf dem Messbalken 13 sowie die Auswertung von deren Signalen dargestellt. Die Fi¬ gur zeigt schematisch den gegen die Anschlagflächen 17 abgestützten Mess¬ balken 13, auf dessen Druckplättchen 20 durch ein Faserband eine Kraft F wirken würde. Zur Auswertung der dadurch entstehenden Dehnung an den beiden Oberflächen des Messbalkens 13 sind an diesen je zwei Dehnungsmessstreifen Dl und D3 bzw. D2 und D4 angeordnet.6a shows the basic arrangement of the strain gauges on the measuring bar 13 and the evaluation of their signals. The figure schematically shows the measuring bar 13 supported against the abutment surfaces 17, on the pressure plate 20 of which a force F would act through a sliver. To evaluate the resulting strain on the two Surfaces of the measuring bar 13 are arranged on each of these two strain gauges D1 and D3 or D2 and D4.
Die Dehnungsmessstreifen liegen symmetrisch zum gedachten Angriffspunkt der Kraft F in der Mitte des Messkanals 4 (Fig. 5). Dadurch ist gewährleistet, dass durch die Umgebungstemperatur oder durch eine örtliche Erwärmung des Messbalkens 13 infolge von Reibung des Faserbandes verursachte Störeffekte voll kompensiert werden.The strain gauges lie symmetrically to the intended point of application of the force F in the middle of the measuring channel 4 (FIG. 5). This ensures that interfering effects caused by friction of the fiber sliver are fully compensated for by the ambient temperature or by local heating of the measuring bar 13.
Jeder Dehnungsmessstreifen Dl bis D4 hat einen bestimmten elektrischen Wi¬ derstand Rl bis R4, wobei diese Widerstände alle gleich sind. Da die rela¬ tive Widerstandsänderung bei Durchbiegung des Messbalkens 13 bekanntlich proportional zur Dehnung der Dehnungsmessstreifen ist, kann die Bestimmung der Dehnung durch eine Messung dieser Widerstandsänderuήg erfolgen. Dies erfolgt mit Hilfe einer Wheatstoneschen Brückenschaltung, welche aus vier Zweigen besteht, die von den ringförmig zusammengeschalteten Widerständen Rl bis R4 gebildet werden. Wenn man nun an die Anschlusspunkte zwischen den Widerständen R4 und Rl einerseits und R2 und R3 anderseits eine Speisespan¬ nung UE anlegt, dann kann man an den beiden übrigen Anschlusspunkten eine zur Brückenverstimmung proportionale Ausgangsspannung UA abgreifen, welche ihrerseits der Summe der Dehnung der einzelnen Dehnungsmessstreifen D! bis D4 proportional ist.Each strain gauge D1 to D4 has a certain electrical resistance Rl to R4, these resistances being all the same. Since the relative change in resistance when the measuring beam 13 bends is known to be proportional to the strain of the strain gauges, the determination of the strain can be made by measuring this change in resistance. This is done with the help of a Wheatstone bridge circuit, which consists of four branches, which are formed by the ring-shaped interconnected resistors Rl to R4. If a supply voltage UE is now applied to the connection points between the resistors R4 and Rl on the one hand and R2 and R3 on the other hand, then an output voltage UA proportional to the bridge detuning can be tapped, which in turn is the sum of the strain of the individual strain gauges D! until D4 is proportional.
Da der Messbalken 13 relativ kurz ist und eine hohe Federkonstante und kleine Masse hat, weist er eine sehr hohe Eigenfrequenz auf und ermöglicht die Messung von sehr kurzen Ungleichmässigkeiten der Banddicke bei hoher Durchlaufgeschwindigkeit des Faserbandes. Weitere Vorteile der beschriebe¬ nen Vorrichtung sind die folgenden:Since the measuring bar 13 is relatively short and has a high spring constant and small mass, it has a very high natural frequency and enables the measurement of very short non-uniformities in the strip thickness at a high one Throughput speed of the sliver. Further advantages of the device described are the following:
- Einfache Bereichsanpassung des Bandtrichters 1 durch Auswechseln der Bandführung (Kanalteil 5).- Simple area adjustment of the band funnel 1 by changing the band guide (channel part 5).
- Möglichkeit der Anordnung des Messorgans sehr nahe an der Abzugsvorrich¬ tung.- Possibility of arranging the measuring element very close to the trigger device.
- Einfache Möglichkeit der Reinigung des Messorgans.- Easy way of cleaning the measuring element.
- Schutz des Messorgans gegen externe mechanische Einwirkungen.- Protection of the measuring element against external mechanical influences.
- Schutz des Messbalkens 13 gegen Ueberdehnung durch mechanischen Anschlag.- Protection of the measuring bar 13 against overexpansion by mechanical stop.
- Praktische Unabhängigkeit des Messorgans von Temperaturschwankungen.- Practical independence of the measuring element from temperature fluctuations.
- Weitgehende Unabhängigkeit des Messorgans von Schwankungen der Faser¬ feinheit des Faserbandes.- The measuring member is largely independent of fluctuations in the fiber fineness of the fiber sliver.
In den Figuren 7 bis 13 ist ein zweites Ausführungsbeispiel eines Band¬ trichters T1 (Fig. 7, 8), eines zur Verwendung mit diesem geeigneten An¬ schlagteils 6' (Fig, 9, 10) und einer passenden Blattfeder BF' (Fig. 11-13) dargestellt: Dabei beträgt der Massstab bei den Figuren 7 und 82:1 und bei den Figuren 9-13 5:1.FIGS. 7 to 13 show a second exemplary embodiment of a band funnel T 1 (FIGS. 7, 8), a stop part 6 ′ (FIGS. 9, 10) suitable for use with this and a suitable leaf spring BF ′ (FIG 11-13): The scale in FIGS. 7 and 82 is 1: 5: 1 in FIGS. 9-13.
Der Bandtrichter T1 gleicht prinzipiell dem in den Fig. 1 bis 3 dargestell¬ ten Bandtrichter T und weist gegenüber diesem als Hauptunterschied eine Austrittsöffnung 3' von annähernd ovalem oder länglichem Querschnitt auf. Diese Form führt zu einer entsprechenden Verformung des Querschnitts des Faserbandes, so dass die Blattfeder an diesem nicht mehr tangeπtial sondern entlang einer Seitenfläche anliegt. Der Bandtrichter T' weist ebenfalls im Anschluss an die Austrittsöffnung 3' eine Abstufung auf, in welche ein Messteil eingesetzt und durch Schrauben (nicht dargestellt) fixiert ist. Während beim Messteil MT des ersten Aus¬ führungsbeispiels (Fig. 1-6) bezogen auf Fig. 1 der Kanalteil 5 unten und der Anschlagteil 6 oben liegt, ist dies beim zweiten Ausführungsbeispiel der Fig. 7 bis 13 umgekehrt. Auf der Abstufung des Bandtrichters T' liegt also unmittelbar der Anschlagtei! 6' (Fig. 9, 10) auf und oberhalb von die¬ sem ist der Kanalteil angeordnet. Die Blattfeder BF' (Fig. 11-13) ist zwi¬ schen diesen beiden Teilen eingespannt. Welcher der beiden Teile, Kanalteil oder Anschlagteil, unmittelbar auf der Abstufung des Bandtrichters T oder T' aufliegt, ist jedoch nicht erfindungswesentlich.The band funnel T 1 is basically the same as the band funnel T shown in FIGS. 1 to 3 and has an outlet opening 3 'of approximately oval or elongated cross section as the main difference with respect to the latter. This shape leads to a corresponding deformation of the cross section of the fiber sliver, so that the leaf spring no longer lies tangentially to it but along a side surface. The band funnel T 'also has a step following the outlet opening 3', in which a measuring part is inserted and fixed by screws (not shown). While in the measuring part MT of the first exemplary embodiment (FIGS. 1-6), with reference to FIG. 1, the channel part 5 is at the bottom and the stop part 6 is at the top, this is reversed in the second exemplary embodiment from FIGS. 7 to 13. The striking part lies directly on the graduation of the band funnel T '! 6 '(FIGS. 9, 10) on and above this the channel part is arranged. The leaf spring BF '(Fig. 11-13) is clamped between these two parts. Which of the two parts, channel part or stop part, lies directly on the gradation of the band funnel T or T 'is not essential to the invention.
Der Kanalteil des zweiten Ausführungsbeispiels entspricht praktisch dem Ka¬ nalteil 5 (Fig. 1) des ersten Ausführungsbeispiels und ist deswegen nicht dargestellt. Dagegen besteht beim Anschlagteil und bei der Blattfeder zwi¬ schen den beiden Ausführungsbeispielen eine Reihe von Unterschieden, welche nun anhand der Figuren 9-13 erläutert werden sollen. Da insbesondere die Blattfedern verschieden sind, soll zuerst die Blattfeder beschrieben wer¬ den.The channel part of the second embodiment practically corresponds to the channel part 5 (FIG. 1) of the first embodiment and is therefore not shown. In contrast, there are a number of differences in the stop part and in the leaf spring between the two exemplary embodiments, which are now to be explained with reference to FIGS. 9-13. Since the leaf springs in particular are different, the leaf spring should first be described.
Wie den Fig. 11-13 entnommen werden kann, besteht die Blattfeder BF' im wesentlichen aus einem deren Randpartie bildenden dickeren Trägerteil 21 und aus einem Messbalken 13', welcher an seiner einen Stirnseite direkt und an seinem anderen Ende über einen Torsionsstab 14' mit dem Trägerteil 21 verbunden ist. Da auch die Blattfeder BF' aus einem Stück gefertigt ist, bezeichnet "verbunden" in diesem Zusammenhang selbstverständlich nicht eine Verbindung zweier verschiedener Teile sondern die Grenze zweier Bereiche ein und desselben Teils. Die Blattfeder BF' weist zwei Bohrungen 22 für den Schrauben 8 (Fig. 1) entsprechende Befestigungsschrauben zur GrobJustierung im Messteil auf. Die FeinJustierung erfolgt durch in einem zweiten Paar von Bohrungen 23 geführte und in entsprechende Gewinde 24 des Anschlagteils 6' (Fig. 9) geschraubte Schrauben (nicht dargestellt).As can be seen in FIGS. 11-13, the leaf spring BF 'essentially consists of a thicker support part 21 forming the edge part thereof and a measuring bar 13', which has one end face directly and another end with a torsion bar 14 ' the carrier part 21 is connected. Since the leaf spring BF 'is also made from one piece, "connected" does not of course refer to one in this context Connection of two different parts but the boundary of two areas of the same part. The leaf spring BF 'has two holes 22 for the screws 8 (FIG. 1) corresponding fastening screws for coarse adjustment in the measuring part. The fine adjustment is carried out by screws (not shown) which are guided in a second pair of bores 23 and screwed into corresponding threads 24 of the stop part 6 '(FIG. 9).
Der Messbalken 13' weist an seinem das durchlaufende und zu messende Faser¬ band kontaktierenden Bereich eine Verdickung 25 mit dem Druckplättchen 20 auf. Die vier Dehnungsmessstreifen sind an der vom Druckpl ttchen 20 abge¬ wandten Fläche des Messbalkens 13', vorzugsweise im Bereich zwischen der Verdickung 25 und dem in den Trägerteil 21 übergehenden stirnseitigen Ende des Messbalkens 13, angeordnet.The measuring bar 13 'has a thickening 25 with the pressure plate 20 on its area contacting the fiber sliver which is passing through and is to be measured. The four strain gauges are arranged on the surface of the measuring bar 13 'facing away from the pressure plate 20, preferably in the area between the thickening 25 and the end of the measuring bar 13 merging into the carrier part 21.
Der Anschlagteil 6' (Fig. 9, 10) ist an die Blattfeder BF' entsprechend an- gepasst und weist an seinem Rand eine annähernd U-förmige Auflagefl che 26 für die Blattfeder BF' sowie im Bereich des Messbalkens !3' eine gegen die Auflagefläche 26 zurückgesetzte Abstufung 27 auf. Die Abstufung 27 wird durch einen im Bereich des Druckplättchens 20 (Fig. 11) angeordneten Steg 28 zweigeteilt. Der Steg 28 überragt zwar die Abstufung 27, liegt aber tie¬ fer als die Auflagefläche 26 und bildet einen die Durchbiegung des Messbal¬ kens 13' begrenzenden Anschlag.The stop part 6 '(FIGS. 9, 10) is correspondingly adapted to the leaf spring BF' and has on its edge an approximately U-shaped support surface 26 for the leaf spring BF 'and in the area of the measuring bar! 3' one against it Contact surface 26 reset gradation 27. The gradation 27 is divided in two by a web 28 arranged in the area of the pressure plate 20 (FIG. 11). The web 28 projects beyond the step 27, but lies deeper than the bearing surface 26 and forms a stop limiting the deflection of the measuring beam 13 '.
Wie den Fig. 9 und 10 weiter zu entnehmen ist, weist der Anschlagteil 6' ausserdem zwei kammerartige Ausfräsungen 29 und 30 auf. In die Kammern 29 und 30 mündet je eine die entsprechende Seitenwand des Anschlagteils 6' durchstossende Bohrung 19 und zumindest in einer der Bohrungen 19 ist ein Röhrchen 18 befestigt. Durch dieses Röhrchen 18 sind via Kammer 30 und Ab¬ stufung 27 die elektrischen Anschlüsse der Dehnungsmessstreifen nach aussen geführt. In der in die Kammer 29 mündenden Bohrung 19 ist ein Nippel befe¬ stigt (nicht dargestellt), durch den zur Reinigung und Kühlung der Mess- stelle von aussen Druckluft in den Anschlagteil 6' geblasen wird, welche via Kammer 29 und Steg 28 über den Messbalken 13' gelangt.As can also be seen from FIGS. 9 and 10, the stop part 6 'also has two chamber-like cutouts 29 and 30. A bore 19, which penetrates the corresponding side wall of the stop part 6 ', opens into the chambers 29 and 30 and at least one of the bores 19 is a Tubes 18 attached. The electrical connections of the strain gauges are guided through this tube 18 via chamber 30 and gradation 27 to the outside. In the bore 19 opening into the chamber 29, a nipple is fastened (not shown), through which compressed air is blown from outside into the stop part 6 'for cleaning and cooling the measuring point, which is sent via the chamber 29 and the web 28 over the Measuring bar 13 'arrives.
Wenn man die Fig. 9 und 11 vergleicht, dann erkennt man, dass die Blattfe¬ der BF' grössere Abmessungen aufweist, als die entsprechende Fläche des An¬ schlagteils 6'. Dies rührt davon her, dass die zum dargestellten Anschlag¬ teil 6' passende Blattfeder BF' an ihrem in Fig. 11 oberen und linken Rand nur bis zu der gestrichelt eingezeichneten Linie G reicht. Die Blattfeder BF' hat in diesem Fall einen annähernd L-förmigen Trägerteil 21 und die in Fig. 11 linke Bohrung 23 befindet sich zwischen dem Torsionsstab 14' und der benachbarten Bohrung 22.If one compares FIGS. 9 and 11, one can see that the leaf spring BF 'has larger dimensions than the corresponding surface of the stop part 6'. This is due to the fact that the leaf spring BF 'matching the illustrated stop part 6' only extends up to the line G shown in broken lines at its upper and left edge in FIG. 11. In this case, the leaf spring BF 'has an approximately L-shaped support part 21 and the bore 23 on the left in FIG. 11 is located between the torsion bar 14' and the adjacent bore 22.
Die in den Fig. 11-13 dargestellte Variante der Blattfeder BF', bei deren Verwendung der Anschlagteil 6' und selbstverständlich auch der Kanalteil 5 (Fig. 1) entsprechend zu modifizieren wären, zeichnet sich dadurch aus, dass der Messbalken 13' und der Torsionsstab !4' allseitig vom Trägerteil 21 umgeben und dadurch gegen äussere Einwirkungen optimal geschützt sind. Wenn die Blattfeder BF' die durch die Umrandung G angedeuteten kleineren Abmessungen hat, dann liegen sowohl der Messbalken 13' als auch der Tor¬ sionsstab 14' am äusseren Rand des Messteils MT (Fig. 1) und können dadurch durch äussere Einwirkung beschädigt werden. Bei der in den Fig. 11 bis 13 dargestellten Blattfeder BF1 ist dies durch die ausserhalb der Umrandung G liegende Partie 21' des Trägerteils 21, welche eine Abschirmung für Mess¬ balken 13' und Torsionsstab 14' bildet, ausgeschlossen. The variant of the leaf spring BF 'shown in FIGS. 11-13, in the use of which the stop part 6' and of course also the channel part 5 (FIG. 1) would have to be modified accordingly, is characterized in that the measuring bar 13 'and the Torsion bar! 4 'surrounded on all sides by the carrier part 21 and thus optimally protected against external influences. If the leaf spring BF 'has the smaller dimensions indicated by the border G, then both the measuring bar 13' and the torsion bar 14 'lie on the outer edge of the measuring part MT (FIG. 1) and can thereby be damaged by external action. In the leaf spring BF 1 shown in FIGS. 11 to 13, this is precluded by the part 21 'of the carrier part 21 lying outside the border G, which forms a shield for the measuring bar 13' and the torsion bar 14 '.

Claims

Patentansprüche Claims
1. Vorrichtung zum Messen der Banddicke und der Ungleich ässigkeit von Faserbändern, vorzugsweise an Spinnereivorbereitungsmaschinen, mit einem das Faserband verdichtenden Verdichtungsorgaπ und mit einem an diesem angeordneten, das verdichtete Faserband in einem Messkanal me¬ chanisch abtastenden und durch eine mit einem Dehnungsmessstreifen versehene Blattfeder gebildeten Messorgan für die Dicke und die Un¬ gleichmässigkeit des Faserbandes, dadurch gekennzeichnet, dass der Messkanal (4) in einem am Verdichtungsorgan (T, T') auswechselbar an¬ geordneten Messteil (MT) vorgesehen und dass der Messteil mit einem Druckluftanschluss (19) ausgerüstet ist.1. Device for measuring the sliver thickness and the unevenness of fiber slivers, preferably on spinning preparation machines, with a compression device compacting the fiber sliver and with an arranged thereon, mechanically scanning the compressed fiber sliver in a measuring channel and formed by a leaf spring provided with a strain gauge Measuring element for the thickness and the unevenness of the sliver, characterized in that the measuring channel (4) is provided in a measuring part (MT) which is interchangeably arranged on the compression element (T, T ') and that the measuring part has a compressed air connection (19) is equipped.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Druck¬ luftanschluss (19) für die Ausblasung des sich ablagernden Staubes und/oder für die Kühlung der Messstelle vorgesehen ist.2. Device according to claim 1, characterized in that the compressed air connection (19) is provided for blowing out the deposited dust and / or for cooling the measuring point.
3. Vorrichtung' nach Anspruch 2, dadurch gekennzeichnet, dass die Blattfe¬ der (BF, BF') quer zur Laufrichtung des Faserbandes angeordnet ist.3. Device ' according to claim 2, characterized in that the Blattfe¬ the (BF, BF') is arranged transversely to the running direction of the sliver.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der Messteil (MT) durch einen Kanalteil (5) und einen Anschlagteil (6, 6') gebildet ist, zwischen denen die Blattfeder (BF, BF') eingespannt ist. 4. The device according to claim 3, characterized in that the measuring part (MT) is formed by a channel part (5) and a stop part (6, 6 '), between which the leaf spring (BF, BF') is clamped.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Blattfe¬ der (BF, BF') einen Messbalken (13, 13') aufweist, welcher an einem Träger (15, 16; 21) federnd gelagert ist.5. The device according to claim 4, characterized in that the Blattfe¬ (BF, BF ') has a measuring bar (13, 13') which is resiliently mounted on a carrier (15, 16; 21).
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass der Messbal¬ ken (13) an seinen Enden über Torsionsstäbe (14) gelagert ist.6. The device according to claim 5, characterized in that the measuring beam (13) is supported at its ends via torsion bars (14).
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet,dass der Messbal¬ ken (13) an seiner am Faserband anliegenden und an der gegenüberlie¬ genden Seite mit mehreren, vorzugsweise mit je zwei Dehnungsmessstrei¬ fen (Dl, D3; D2, D4) versehen ist.7. The device according to claim 6, characterized in that the Messbal¬ ken (13) on its on the fiber sliver and on the opposite side with several, preferably with two strain gauges (Dl, D3; D2, D4) is.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Deh¬ nungsmessstreifen (Dl, D3; D2, D4) an jeder Seite des Messbalkens (13) symmetrisch zur Längsachse des Messkanals (4) angeordnet sind.8. The device according to claim 7, characterized in that the strain gauges (Dl, D3; D2, D4) are arranged on each side of the measuring bar (13) symmetrically to the longitudinal axis of the measuring channel (4).
9. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die vom Messbalken (13) abgewandten Enden der Torsionsstäbe (14) über einen Verbindungsteil (15) verbunden sind.9. The device according to claim 6, characterized in that the ends of the torsion bars (14) facing away from the measuring beam (13) are connected via a connecting part (15).
10. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass der An¬ schlagteil (6) im Bereich des Messbalkens (13) zwei Auflageflächen (17) für dessen Enden aufweist.10. The device according to claim 6, characterized in that the stop part (6) in the region of the measuring bar (13) has two contact surfaces (17) for its ends.
11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass der An¬ schlagteil (6) zwischen den beiden Auflageflächen (17) einen gegenüber dem Messbalken (13) zurückversetzten Steg zur Begrenzung der Durch¬ biegung des Messbalkens aufweist.11. The device according to claim 10, characterized in that the stop part (6) between the two contact surfaces (17) opposite one the measuring bar (13) set back web to limit the deflection of the measuring bar.
12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der An¬ schlagteil (6) im Anschluss an seine den Verbindungsteil (15) einspan¬ nende Partie ein U-förmiges Profil aufweist, wobei die Auflageflächen an dessen Seitenwänden vorgesehen sind, und dass der Druckluftan¬ schluss (19) für die Reinigung und/oder Kühlung des Iπnenraums des Messteils (MT) und des Messbalkens (13) in einer der Seitenwände vorgesehen ist.12. The device according to claim 11, characterized in that the stop part (6) has a U-shaped profile following its part connecting the connecting part (15), the bearing surfaces being provided on the side walls thereof, and that the Compressed air connection (19) for cleaning and / or cooling the interior of the measuring part (MT) and the measuring bar (13) is provided in one of the side walls.
13. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass der Messbal¬ ken (13') an seinem einen Ende unmittelbar und an seinem anderen Ende über einen Torsionsstab (14') am Träger (21) gelagert ist.13. The apparatus according to claim 5, characterized in that the measuring beam (13 ') is mounted directly at one end and at its other end via a torsion bar (14') on the carrier (21).
14. Vorrichtung nach Anspruch 6 oder 13, dadurch gekennzeichnet, dass der Messbalken (13, 13') an seiner am Faserband anliegenden Seite im Be¬ reich der Längsachse des Messkanals (4) mit einem Druckplättchen (20) aus vorzugsweise Hartmetall oder Keramik versehen ist.14. The device according to claim 6 or 13, characterized in that the measuring bar (13, 13 ') on its side lying on the sliver in the region of the longitudinal axis of the measuring channel (4) is provided with a pressure plate (20) made preferably of hard metal or ceramic is.
15. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass die Blatt¬ feder (BF, BF') aus einem Stück hergestellt ist.15. The apparatus according to claim 14, characterized in that the leaf spring (BF, BF ') is made in one piece.
16. Vorrichtung nach den Ansprüchen 13 und 15, dadurch gekennzeichnet, dass der den Träger (21) bildende Teil der Blattfeder (BF1) eine grös- sere Dicke aufweist als der Messbalken (13'). 16. Device according to claims 13 and 15, characterized in that the part of the leaf spring (BF 1 ) forming the carrier (21) has a greater thickness than the measuring bar (13 ').
17. Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass der Träger17. The apparatus according to claim 16, characterized in that the carrier
(21) eine L-förmige Gestalt aufweist, und dass der Messbalken (13') direkt an dem einen und über den Torsionsstab (14') an dem anderen Schenkel des Trägers gelagert ist.(21) has an L-shaped shape, and that the measuring bar (13 ') is mounted directly on one leg and, via the torsion bar (14'), on the other leg of the carrier.
18. Vorrichtung nach Anspruch 17, dadurch gekennzeichnet, dass am Träger (21) ein zusätzlicher Teil (21') zum Schutz des Messbalkens (13') und des Torsionsstabs (14') gegen äussere Einwirkungen vorgesehen ist.18. The apparatus according to claim 17, characterized in that an additional part (21 ') for protecting the measuring beam (13') and the torsion bar (14 ') is provided on the carrier (21) against external influences.
19. Vorrichtung nach Anspruch 18, dadurch gekennzeichnet, dass der zusätz¬ liche Teil (21') ebenfalls L-förmige Gestalt aufweist und mit dem Trä¬ ger (21) zu einem rechteckförmigen, einstückigen Plättchen zusammenge¬ setzt ist, und dass Messbalken (13') und Torsionsstab (!4') im Innen¬ teil dieses Plättchens angeordnet sind.19. The device according to claim 18, characterized in that the additional part (21 ') also has an L-shaped shape and is assembled with the carrier (21) to form a rectangular, one-piece plate, and that measuring bar ( 13 ') and torsion bar (! 4') are arranged in the inner part of this plate.
20. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass das Ver¬ dichtungsorgan (T1) eine Austrittsöffnung (3') für das Faserband mit einem ovalen oder länglichen Querschnitt aufweist, und dass der Mess¬ balken (13') parallel zu einer der längeren Seitenkanten der Aus¬ trittsöffnung orientiert ist.20. The apparatus according to claim 13, characterized in that the compression member (T 1 ) has an outlet opening (3 ') for the sliver with an oval or elongated cross section, and that the measuring bar (13') parallel to one of the longer side edges of the outlet opening.
21. Vorrichtung nach den Ansprüchen 13 und 14, dadurch gekennzeichnet, dass der Anschlagteil (6') eine Auflagefläche (26) für die Blattfeder (BF1) sowie im Bereich des Messbalkens (13') eine gegen die Auflage¬ fläche zurückgesetzte Abstufung (27) aufweist, welche durch einen im Bereich des Druckplättchens (20) angeordneten Steg (28) unterteilt ist, dessen dem Messbalken zugewandte Fläche im Niveau zwischen der Auflagefläche und der Abstufung liegt und einen Anschlag für den Mess¬ balken bildet.21. Device according to claims 13 and 14, characterized in that the stop part (6 ') has a bearing surface (26) for the leaf spring (BF 1 ) and in the area of the measuring bar (13') a step back set against the bearing surface ( 27), which is subdivided by a web (28) arranged in the region of the pressure plate (20) is, the surface facing the measuring bar lies in the level between the contact surface and the gradation and forms a stop for the measuring bar.
22. Vorrichtung nach Anspruch 21, dadurch gekennzeichnet, dass im An- schlagtei! (6') zwei Kammern (29, 30) vorgesehen sind, von denen die erste (29) mit beiden Teilen und die zweite mit einem Teil der Abstu¬ fung (27) verbunden ist, dass von beiden Kammern je eine Bohrung (19) im Anschlagteil nach aussen führt, und dass die in die erste Kammer mündende Bohrung als Druck!uftanschluss und die in die zweite Kammer mündende Bohrung für die Durchführung elektrischer Leitungen zu auf dem Messbalken (13') angeordneten Dehnungsmessstreifen vorgesehen ist. 22. The apparatus according to claim 21, characterized in that in the attachment! (6 ') two chambers (29, 30) are provided, of which the first (29) is connected to both parts and the second to a part of the step (27), that each of the two chambers has a bore (19) leads to the outside in the stop part, and that the bore opening into the first chamber is provided as a compressed air connection and the bore opening into the second chamber is provided for the passage of electrical lines to strain gauges arranged on the measuring bar (13 ').
EP87900630A 1986-01-16 1987-01-14 Device for measuring the thickness of slivers Expired - Lifetime EP0252952B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87900630T ATE52113T1 (en) 1986-01-16 1987-01-14 DEVICE FOR MEASURING THE TAPE THICKNESS OF FIBER TAPE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH156/86A CH668833A5 (en) 1986-01-16 1986-01-16 DEVICE FOR MEASURING AND / OR COMPARISONING THE TAPE THICKNESS OF FIBER TAPES.
CH156/86 1986-01-16

Publications (2)

Publication Number Publication Date
EP0252952A1 true EP0252952A1 (en) 1988-01-20
EP0252952B1 EP0252952B1 (en) 1990-04-18

Family

ID=4180526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87900630A Expired - Lifetime EP0252952B1 (en) 1986-01-16 1987-01-14 Device for measuring the thickness of slivers

Country Status (6)

Country Link
US (1) US4864853A (en)
EP (1) EP0252952B1 (en)
JP (1) JP2593326B2 (en)
CH (1) CH668833A5 (en)
SU (1) SU1565355A3 (en)
WO (1) WO1987004472A1 (en)

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Also Published As

Publication number Publication date
SU1565355A3 (en) 1990-05-15
JPS63502290A (en) 1988-09-01
EP0252952B1 (en) 1990-04-18
US4864853A (en) 1989-09-12
CH668833A5 (en) 1989-01-31
JP2593326B2 (en) 1997-03-26
WO1987004472A1 (en) 1987-07-30

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