WO1989009299A1 - Feed device for flexible workpieces - Google Patents

Feed device for flexible workpieces Download PDF

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Publication number
WO1989009299A1
WO1989009299A1 PCT/EP1989/000292 EP8900292W WO8909299A1 WO 1989009299 A1 WO1989009299 A1 WO 1989009299A1 EP 8900292 W EP8900292 W EP 8900292W WO 8909299 A1 WO8909299 A1 WO 8909299A1
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WO
WIPO (PCT)
Prior art keywords
pressure
feed device
conveyor belt
transmission member
workpiece
Prior art date
Application number
PCT/EP1989/000292
Other languages
German (de)
French (fr)
Inventor
Conrad Arbter
Original Assignee
Pfaff Industriemaschinen Gmbh
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 Pfaff Industriemaschinen Gmbh filed Critical Pfaff Industriemaschinen Gmbh
Publication of WO1989009299A1 publication Critical patent/WO1989009299A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B33/00—Devices incorporated in sewing machines for supplying or removing the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/10—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration comprising two or more co-operating endless surfaces with parallel longitudinal axes, or a multiplicity of parallel elements, e.g. ropes defining an endless surface
    • B65G15/12—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration comprising two or more co-operating endless surfaces with parallel longitudinal axes, or a multiplicity of parallel elements, e.g. ropes defining an endless surface with two or more endless belts
    • B65G15/14—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration comprising two or more co-operating endless surfaces with parallel longitudinal axes, or a multiplicity of parallel elements, e.g. ropes defining an endless surface with two or more endless belts the load being conveyed between the belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/02—Articles
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices

Definitions

  • the invention relates to a feed device according to the preamble of claim 1.
  • the feed device consists of a conveyor belt and a pressure device for its lower strand which advances the workpiece.
  • the pressure device has a plurality of rollers, each of which is carried by pairs of swivel levers, which are arranged one behind the other in the workpiece transport direction and are mounted on a stationary machine part.
  • the swivel levers are connected to a common adjusting rod, with the aid of which they can be swiveled so that the rollers are pressed from above onto the conveyor belt strand, which is the
  • the workpiece is gripped and fed to the sewing machine.
  • a sewing unit in which a conveyor belt on one Elongated carrier is mounted, on which a band-shaped, flexible pressure transmission element is also arranged, which presses from above onto the strand of the conveyor belt which transports the workpiece, the pressure being applied by annular spring elements which are supported against the carrier. Due to the fact that the spring elements do not act directly on the conveyor belt, but indirectly via the band-shaped pressure transmission member, a more even distribution of the
  • Pressing force on the lower conveyor belt strand is achieved than in a device in which the conveyor belt is pressed on by rollers, but an uneven, d. H. undulating pressure distribution, so that even with this device no constant friction between the conveyor belt and the workpiece is achieved.
  • the entire pressure device must be raised so that the frictional contact between the conveyor belt and the workpiece is eliminated.
  • the invention is therefore based on the object of providing a feed device of the generic type in which a uniform frictional engagement between the conveyor belt and the workpiece can be achieved with little technical effort over the length of the pressing device and can be easily canceled if necessary.
  • This object is achieved by the characterizing features of claim 1.
  • the pressure device contains only a small number of moving parts. There are no joint connections that are subject to wear and could therefore result in bearing play that impairs the working method. Due to the inflatable pressure hose arranged inside the holding bar and extending in its longitudinal direction, a completely uniform contact pressure can be applied to the strand of the workpiece resting on the workpiece over the entire length of the holding bar
  • Frictional contact between the conveyor belt and the workpiece is interrupted for a possible cross-conveying.
  • Another advantage of the invention is that the pressure device can be constructed very flat overall. Since the movement paths for pressing the conveyor belt are only small, the pressure hose need not have a very large volume.
  • the measure according to claim 2 of arranging a plurality of pressure hoses which can be acted upon independently of one another in the longitudinal direction one behind the other within the holding strip, can optionally eliminate the frictional contact between the conveyor belt and the workpiece in certain sections of the
  • Feed device take place. Furthermore, it is possible to control the pressure distribution, for example, in such a way that a first workpiece is held in a partial area of the feed device, while in a different partial area a second workpiece, for example of Hand, can be moved freely because there is no pressure on the conveyor belt.
  • the contact pressure in one or more pressure hoses can be adapted to the requirements of the workpiece to be transported or machined, i. that is, a gentle pressure is set for light materials and a higher pressure for heavy goods.
  • a pressure device that has a plurality of pressure hoses, one of which is arranged in front of the sewing machine, which otherwise only a skilled seamstress can achieve by hand by targeted tightening or yielding of the workpiece.
  • a slip can be generated between the conveyor belt and the workpiece, which in connection with the feeder of the sewing machine carrying out a larger feed leads to that the workpiece is stretched to a certain extent.
  • Figure 1 is a schematic view of a sewing unit and a feed device according to a first embodiment of the invention.
  • Fig. 2 is a sectional view of the feed device according to line II-II of Fig. 1;
  • FIGS. 1 and 2 shows an end view of the pressure device according to FIGS. 1 and 2;
  • Fig. 4 is a sectional view corresponding to Figure 2 of another embodiment of a pressure transmission member.
  • Fig. 5 is a sectional view of part of the
  • Fig. 6 is a sectional view taken along the line VI-VI of Fig. 4, and
  • Fig. 7 shows a sewing unit according to a second
  • Embodiment of the invention with several pressure hoses in the pressure device.
  • the sewing unit comprises a table (1) with a support surface (2), a sewing machine (3) with a feed dog (4) and a feed device (5) with an endless conveyor belt (6), one of which runs around two deflection rollers (7) Section is shown, and a pressure device (8) for the Conveyor belt (6).
  • a strand (6a) which transports the material (9), runs from the conveyor belt (6) on the support surface (2) or, as in the example shown, a short distance above it and leads past the sewing point.
  • the pressure device (8) contains a box-shaped holding strip (10) which is open at the bottom and on which sealing plates (11) are attached on the end face.
  • the holding strip (10) extends essentially over the entire run (6a) of the conveyor belt (6).
  • the holding strip (10) has in its lower edge inwardly projecting edge sections (12) which leave a space between them.
  • a pressure transmission member (13) extends loosely over the length of the holding strip (10) and is made, for example, of polytetrafluoroethylene (PTFE) or another material with a low profile
  • PTFE polytetrafluoroethylene
  • a pressure hose (14) which can be pressurized with compressed air and which, when inflated, presses on the pressure transmission member (13).
  • the pressure hose (14) is connected via a connection piece (15) and a line (16) to a 3/2-way valve (17) which is connected to a compressed air source (19) via a pressure control valve (18).
  • the strand (6a) of the conveyor belt (6) pressing against the workpiece (9) is guided laterally from the inwardly projecting edge sections (12) of the holding strip (10).
  • a corresponding cutout (20) is formed for the conveyor belt (6).
  • Pressure transmission member (13) in this embodiment is a substantially flat, strip-shaped component.
  • the pressure transmission member (13) protects the pressure hose (14) against the rubbing movement of the conveyor belt (6). It is secured against displacement in the longitudinal direction by the rear closure plate 11.
  • the pressure transmission member (13) can be a body with a cross-sectional profile, consisting of a section (13a) projecting downward from the holding bar (10) and lateral edge strips (13b) arranged inside the holding bar (10), which of the Edge sections (12) of the retaining strip (10) are supported.
  • Pressure transmission member (13) and the edge portions (12) of the retaining strip (10) each have a resilient element, which in the present example is formed by a wave-shaped spring band (21). These spring bands are able to raise the pressure transmission member (13) when the pressure hose (14) is depressurized so that it loses contact with the conveyor belt strand (6a), as shown in FIG. 5. It is understood that such spring devices can also be used in the embodiment according to FIG. 2.
  • the pressure transmission member (13) can be structured in the longitudinal direction
  • the embodiment according to FIG. 7 differs from that according to FIG. 1 in that several pressure hoses, in the present case three pressure hoses (14a, 14b and 14c), are arranged in a common retaining strip (10), which are connected via corresponding connecting pieces (15a, 15b and 15c) are connected to 3/2-way valves (17a, 17b and 17c).
  • the directional valves (17b, 17c) for the middle and rear pressure hose (14b, 14c) are connected directly to the pressure source (19).
  • the directional valve (17a) of the front pressure hose (14a) is indirectly connected to the compressed air source (19) via a pressure control valve (18).
  • the directional control valves (17a, 17b and 17c) can be switched individually by means of a control device (22), with which the pressure at the pressure control valve (18) can also be set, to independently operate the associated pressure hoses (14a, 14b and 14c) to be able to vent. It goes without saying that possibly only two or even more than three pressure hoses can be arranged in the holding strip (10).
  • the pressure hoses (14 and 14a-14c) are vented to ambient pressure, ie atmospheric pressure, via the directional valves (17 and 17a-17c). After venting but still press the slack pressure hoses with their own weight onto the pressure transmission element (13).
  • the feed device (5) can optionally have a plurality of conveyor belts running parallel to one another, each of which is assigned its own pressure device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The feed device for a belt conveyor ensures, in a technically simple manner, uniform frictional engagement between belt conveyor and workpiece along the feed device. The feed device comprises a retaining strip (10) open at the bottom, one or more pressure hoses (14) with air supply and exhaust, and a strip-shaped pressure-transmitting member (13) in contact with the belt conveyor (6). When the air is evacuated from the pressure hose (14), the contact pressure on the belt conveyor (6), and hence the conveying action of the latter, is discontinued. The feed device is particularly suited for conveying workpieces to sewing aggregates and folding and packaging machines.

Description

Beschreibung description
Vorschubeinrichtung für flexible WerkstückeFeed device for flexible workpieces
Die Erfindung bezieht sich auf eine Vorschubeinrichtung nach dem Oberbegriff des Anspruches 1.The invention relates to a feed device according to the preamble of claim 1.
Bei einem durch die US-PS 3 918 573 bekannten Nähaggregat besteht die Vorschubeinrichtung aus einem Transportband und einer Andruckvorrichtung für dessen unteres, das Werkstück vorschiebendes Trum. Die Andruckvorrichtung weist eine Vielzahl von Rollen auf, die jeweils von Schwenkhebelpaaren getragen sind, welche in Werkstücktransportrichtung hintereinander angeordnet und an einem feststehenden Maschinenteil gelagert sind. Die Schwenkhebel sind mit einer gemeinsamen Stellstange verbunden, mit deren Hilfe sie so verschwenkt werden können, daß die Rollen von oben auf das Transportbandtrum gedrückt werden, welches dasIn a sewing unit known from US Pat. No. 3,918,573, the feed device consists of a conveyor belt and a pressure device for its lower strand which advances the workpiece. The pressure device has a plurality of rollers, each of which is carried by pairs of swivel levers, which are arranged one behind the other in the workpiece transport direction and are mounted on a stationary machine part. The swivel levers are connected to a common adjusting rod, with the aid of which they can be swiveled so that the rollers are pressed from above onto the conveyor belt strand, which is the
Werkstück reibschlüssig erfaßt und der Nähmaschine zuführt.The workpiece is gripped and fed to the sewing machine.
Diese Anordnung ist konstruktiv aufwendig und daher sehr teuer. Sie weist darüberhinaus den Nachteil auf, daß auf das Transportband nur an einzelnen Stellen gedrückt wird, so daß sich längs der Transportrichtung des Werkstückes ein ungleichmäßiger Andruck und somit ein ungleichmäßiger Reibschluß zwischen dem Transportband und dem Werkstück ergibt.This arrangement is structurally complex and therefore very expensive. It also has the disadvantage that the conveyor belt is pressed only at individual points, so that there is an uneven pressure and thus an uneven frictional connection between the conveyor belt and the workpiece along the transport direction of the workpiece.
Aus der für die Bildung des Oberbegriffs des Anspruchs 1 herangezogenen US-PS 4 204 492 ist ein Nähaggregat bekannt, bei der ein Transportband an einem langgestreckten Träger gelagert ist, an dem ferner ein bandförmiges, flexibles Druckübertragungsglied angeordnet ist, das von oben auf das das Werkstück transportierende Trum des Transportbandes drückt, wobei der Druck von ringförmigen Federelementen aufgebracht wird, die gegen den Träger abgestützt sind. Aufgrunddessen, daß die Federelemente nicht direkt, sondern indirekt über das bandförmige Druckübertragungsglied auf das Transportband einwirken, wird zwar eine gleichmäßigere Verteilung derFrom the US-PS 4 204 492 used for the formation of the preamble of claim 1, a sewing unit is known in which a conveyor belt on one Elongated carrier is mounted, on which a band-shaped, flexible pressure transmission element is also arranged, which presses from above onto the strand of the conveyor belt which transports the workpiece, the pressure being applied by annular spring elements which are supported against the carrier. Due to the fact that the spring elements do not act directly on the conveyor belt, but indirectly via the band-shaped pressure transmission member, a more even distribution of the
Andruckkraft auf das untere Transportbandtrum erzielt als bei einer Einrichtung, bei der das Transportband durch Rollen angedrückt wird, dennoch tritt auch hierbei noch eine ungleichmäßige, d. h. wellenförmige Druckverteilung auf, so daß auch bei dieser Einrichtung noch kein konstanter Reibschluß zwischen dem Transportband und dem Werkstück erzielt wird.Pressing force on the lower conveyor belt strand is achieved than in a device in which the conveyor belt is pressed on by rollers, but an uneven, d. H. undulating pressure distribution, so that even with this device no constant friction between the conveyor belt and the workpiece is achieved.
Wenn das Werkstück am Ende der Transportstrecke vor dem Verlassen des Transportbandes quer zu dessenIf the workpiece at the end of the transport route before leaving the conveyor belt transversely to it
Bewegungsrichtung weitergefördert werden soll, so muß die gesamte Andruckvorrichtung angehoben werden, damit der Reibungskontakt zwischen dem Transportband und dem Werkstück aufgehoben wird.If the direction of movement is to be conveyed further, the entire pressure device must be raised so that the frictional contact between the conveyor belt and the workpiece is eliminated.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorschubeinrichtung der gattungsgemäßen Art zu schaffen, bei der mit geringem technischem Aufwand über die Länge der Andruckvorrichtung ein gleichmäßiger Reibschluß zwischen dem Transportband und dem Werkstück erzielbar und bei Bedarf auf einfache Weise aufhebbar ist. Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Es ist ein besonderes Merkmal der Erfindung, daß die Andruckvorrichtung nur eine geringe Zahl bewegter Teile enthält. Gelenkverbindungen, die einem VerschleIβ unterworfen sind und daher Lagerspiel zur Folge haben könnten, das die Arbeitsweise beeinträchtigt, fehlen ganz. Durch den innerhalb der Halteleiste angeordneten sich in dessen Längsrichtung erstreckenden aufblasbaren Druckschlauch läßt sich über die gesamte Länge der Halteleiste ein völlig gleichmäßiger Anpreßdruck auf das auf dem Werkstück aufliegende Trum desThe invention is therefore based on the object of providing a feed device of the generic type in which a uniform frictional engagement between the conveyor belt and the workpiece can be achieved with little technical effort over the length of the pressing device and can be easily canceled if necessary. This object is achieved by the characterizing features of claim 1. It is a special feature of the invention that the pressure device contains only a small number of moving parts. There are no joint connections that are subject to wear and could therefore result in bearing play that impairs the working method. Due to the inflatable pressure hose arranged inside the holding bar and extending in its longitudinal direction, a completely uniform contact pressure can be applied to the strand of the workpiece resting on the workpiece over the entire length of the holding bar
Transportbandes erzielen. So wie der Anpreßdruck durch Beaufschlagen des Druckschlauches mit Druckluft auf einfache Weise aufgebaut wird, läßt er sich durch Entlüften des Druckschlauches auf die gleiche einfache Weise wieder aufheben, so daß danach derAchieve conveyor belt. Just as the contact pressure is built up in a simple way by pressurizing the pressure hose with compressed air, it can be canceled in the same simple manner by venting the pressure hose, so that afterwards the
Reibungskontakt zwischen dem Transportband und dem Werkstück für eine eventuelle Querförderung unterbrochen ist. Ein weiterer Vorteil der Erfindung besteht darin, daß die Andruckvorrichtung insgesamt sehr flach aufgebaut werden kann. Da die Bewegungswege zum Andrücken des Transportbandes nur klein sind, braucht der Druckschlauch kein sehr großes Volumen zu haben.Frictional contact between the conveyor belt and the workpiece is interrupted for a possible cross-conveying. Another advantage of the invention is that the pressure device can be constructed very flat overall. Since the movement paths for pressing the conveyor belt are only small, the pressure hose need not have a very large volume.
Durch die Maßnahme nach Anspruch 2, innerhalb der Halteleiste mehrere unabhängig voneinander beaufschlagbare Druckschläuche in Längsrichtung hintereinander anzuordnen, kann die Aufhebung des. Reibkontaktes zwischen dem Transportband und dem Werkstück wahlweise in bestimmten Abschnitten derThe measure according to claim 2, of arranging a plurality of pressure hoses which can be acted upon independently of one another in the longitudinal direction one behind the other within the holding strip, can optionally eliminate the frictional contact between the conveyor belt and the workpiece in certain sections of the
Vorschubeinrichtung erfolgen. Ferner ist es möglich, die Druckverteilung beispielsweise so zu steuern, daß in einem Teilbereich der Vorschubeinrichtung ein erstes Werkstück festgehalten wird, während in einem anderen Teilbereich ein zweites Werkstück, beispielsweise von Hand, frei bewegt werden kann, weil dort kein Druck auf das Transportband ausgeübt wird.Feed device take place. Furthermore, it is possible to control the pressure distribution, for example, in such a way that a first workpiece is held in a partial area of the feed device, while in a different partial area a second workpiece, for example of Hand, can be moved freely because there is no pressure on the conveyor belt.
Durch die Maßnahme nach Anspruch 3 läßt sich der Anpreßdruck in einem oder mehreren Druckschläuche an die Erfordernisse des jeweils zu transportierenden bzw. zu bearbeitenden Werkstückes anpassen, d. h., daß für leichte Materialien ein sanfter Druck und für schwere Ware ein höherer Druck eingestellt wird.By the measure according to claim 3, the contact pressure in one or more pressure hoses can be adapted to the requirements of the workpiece to be transported or machined, i. that is, a gentle pressure is set for light materials and a higher pressure for heavy goods.
Bei Verwendung der Vorschubeinrichtung an einem Nähaggregat lassen sich bei einer Andruckvorrichtung, die mehrere Druckschläuche aufweist, von denen einer vor der Nähmaschine angeordnet ist, bestimmte Nähergebnisse erreichen, die sonst nur eine geübte Näherin von Hand durch gezieltes Straffen oder Nachgeben des Werkstückes erzielen kann. Zu diesem Zweck kann beispielsweise durch gezieltes Einstellen des Anpreßdruckes des vor der Nähmaschine befindlichen Druckschlauches ggf. in Verbindung mit einer mechanischen Bremse ein Schlupf zwischen dem Transportband und dem Werkstück erzeugt werden, der in Verbindung mit dem einen größeren Vorschub ausführenden Transporteur der Nähmaschine dazu führt, daß das Werkstück in bestimmtem Umfang gedehnt wird.When using the feed device on a sewing unit, certain sewing results can be achieved with a pressure device that has a plurality of pressure hoses, one of which is arranged in front of the sewing machine, which otherwise only a skilled seamstress can achieve by hand by targeted tightening or yielding of the workpiece. For this purpose, for example, by specifically adjusting the contact pressure of the pressure hose located in front of the sewing machine, possibly in conjunction with a mechanical brake, a slip can be generated between the conveyor belt and the workpiece, which in connection with the feeder of the sewing machine carrying out a larger feed leads to that the workpiece is stretched to a certain extent.
In den anderen Unteransprüchen sind weitere vorteilhafte Weiterbildungen der Erfindung angegeben. Die Erfindung wird nachfolgend unter Bezugnahme auf in den Zeichnungen dargestellte Ausführungsbeispiele in Verbindung mit einem Nähaggregat näher erläutert. Es zeigt :Further advantageous developments of the invention are specified in the other subclaims. The invention is explained in more detail below with reference to exemplary embodiments shown in the drawings in connection with a sewing unit. It shows :
Fig. 1 eine schematische Ansicht eines Nähaggregates und einer Vorschubeinrichtung gemäß einem ersten Ausführungsbeispiel der Erfindung;Figure 1 is a schematic view of a sewing unit and a feed device according to a first embodiment of the invention.
Fig. 2 eine Schnittdarstellung der Vorschubeinrichtung nach Linie II-II der Fig. 1;Fig. 2 is a sectional view of the feed device according to line II-II of Fig. 1;
Fig. 3 eine stirnseitige Ansicht der Andruckvorrichtung nach den Figuren 1 und 2;3 shows an end view of the pressure device according to FIGS. 1 and 2;
Fig. 4 eine Schnittdarstellung entsprechend Fig. 2 einer anderen Ausführungsform eines Druckübertragungsgliedes;Fig. 4 is a sectional view corresponding to Figure 2 of another embodiment of a pressure transmission member.
Fig. 5 eine Schnittdarstellung eines Teiles derFig. 5 is a sectional view of part of the
Andruckvorrichtung nach Linie V-V der Fig. 4;Pressure device according to line V-V of Fig. 4;
Fig. 6 eine Schnittdarstellung längs der Linie VI-VI der Fig. 4, undFig. 6 is a sectional view taken along the line VI-VI of Fig. 4, and
Fig. 7 ein Nähaggregat gemäß einer zweitenFig. 7 shows a sewing unit according to a second
Ausführungsform der Erfindung mit mehreren Druckschläuchen in der Andruckvorrichtung.Embodiment of the invention with several pressure hoses in the pressure device.
Das Nähaggregat umfaßt einen Tisch (1) mit einer Auflagefläche (2), eine Nähmaschine (3) mit einem Transporteur (4) und eine Vorschubeinrichtung (5) mit einem endlosen Transportband (6), von dem ein um zwei Umlenkrollen (7) verlaufender Abschnitt dargestellt ist, und eine Andruckvorrichtung (8) für das Transportband (6). Von dem Transportband (6) verläuft ein das Nähgut (9) transportierendes Trum (6a) auf der Auflagefläche (2) oder, wie im dargestellten Beispiel, in geringem Abstand parallel darüber und führt an der Nähstelle vorbei.The sewing unit comprises a table (1) with a support surface (2), a sewing machine (3) with a feed dog (4) and a feed device (5) with an endless conveyor belt (6), one of which runs around two deflection rollers (7) Section is shown, and a pressure device (8) for the Conveyor belt (6). A strand (6a), which transports the material (9), runs from the conveyor belt (6) on the support surface (2) or, as in the example shown, a short distance above it and leads past the sewing point.
Die Andruckvorrichtung (8) enthält eine kastenförmige, unten offene Halteleiste (10), an der stirnseitig Verschlußplatten (11) angebracht sind. Die Halteleiste (10) erstreckt sich im wesentlichen über das gesamte Trum (6a) des Transportbandes (6).The pressure device (8) contains a box-shaped holding strip (10) which is open at the bottom and on which sealing plates (11) are attached on the end face. The holding strip (10) extends essentially over the entire run (6a) of the conveyor belt (6).
Gemäß Fig. 2 weist die Halteleiste (10) an ihrem unteren Rand nach innen vorstehende Randabschnitte (12) auf, die zwischen sich einen Zwischenraum freilassen.According to FIG. 2, the holding strip (10) has in its lower edge inwardly projecting edge sections (12) which leave a space between them.
Auf diesen Randabschnitten (12) liegt ein sich über die Länge der Halteleiste (10) erstreckendes Druckübertragungsglied (13) lose auf, das beispielsweise aus Polytetrafluorethylen (PTFE) oder einem anderen Material mit geringemOn these edge sections (12) a pressure transmission member (13) extends loosely over the length of the holding strip (10) and is made, for example, of polytetrafluoroethylene (PTFE) or another material with a low profile
Reibungskoeffizienten besteht oder an seiner Unterseite mit einem solchen Material beschichtet ist. Innerhalb des von der Halteleiste (10) umschlossenen Hohlraums befindet sich ein mit Druckluft beaufschlagbarer Druckschlauch (14), der im .aufgeblasenen Zustand auf das Druckübertragungsglied (13) drückt. Über einen Anschlußstutzen (15) und eine Leitung (16) ist der Druckschlauch (14) mit einem 3/2-Wegeventil (17) verbunden, das über ein Druckregelventil (18) mit einer Druckluftquelle (19) verbunden ist.Friction coefficient exists or is coated on the underside with such a material. Inside the cavity enclosed by the retaining strip (10) there is a pressure hose (14) which can be pressurized with compressed air and which, when inflated, presses on the pressure transmission member (13). The pressure hose (14) is connected via a connection piece (15) and a line (16) to a 3/2-way valve (17) which is connected to a compressed air source (19) via a pressure control valve (18).
Gemäß den Figuren 2 und 3 wird das gegen das Werkstück (9) drückende Trum (6a) des Transportbandes (6) von den nach innen vorstehenden Randabschnitten (12) der Halteleiste (10) seitlich geführt. In den Abdeckplatten (11) ist ein entsprechender Ausschnitt (20) für das Transportband (6) ausgebildet.According to FIGS. 2 and 3, the strand (6a) of the conveyor belt (6) pressing against the workpiece (9) is guided laterally from the inwardly projecting edge sections (12) of the holding strip (10). In the cover plates (11) a corresponding cutout (20) is formed for the conveyor belt (6).
Wie Fig. 2 im Schnitt zeigt, ist dasAs shown in Fig. 2 in section, that is
Druckübertragungsglied (13) bei dieser Ausführungsform ein im wesentlichen flaches, streifenförmiges Bauteil. Das Druckübertragungsglied (13) schützt den Druckschlauch (14) gegen die reibende Bewegung des Transportbandes (6). Es ist durch die hintere Verschlußplatte 11 gegen eine Verschiebung in Längsrichtung gesichert.Pressure transmission member (13) in this embodiment is a substantially flat, strip-shaped component. The pressure transmission member (13) protects the pressure hose (14) against the rubbing movement of the conveyor belt (6). It is secured against displacement in the longitudinal direction by the rear closure plate 11.
Gemäß Fig. 4 kann das Druckübertragungsglied (13) ein im Querschnitt profilierter Körper sein, bestehend aus einem aus der Halteleiste (10) nach unten vorstehenden Abschnitt (13a) und innerhalb der Halteleiste (10) angeordneten seitlichen Randstreifen (13b), die von den Randabschnitten (12) der Halteleiste (10) abgestützt werden.According to FIG. 4, the pressure transmission member (13) can be a body with a cross-sectional profile, consisting of a section (13a) projecting downward from the holding bar (10) and lateral edge strips (13b) arranged inside the holding bar (10), which of the Edge sections (12) of the retaining strip (10) are supported.
In vorteilhafter Weiterbildung der Erfindung ist zwischen den Randstreifen (13b) desIn an advantageous development of the invention, between the edge strips (13b)
Druckübertragungsgliedes (13) und den Randabschnitten (12) der Halteleiste (10) jeweils ein federndes Element angeordnet, das im vorliegenden Beispiel jeweils von einem wellenförmigen Federband (21) gebildet ist. Diese Federbänder sind in der Lage, im drucklosen Zustand des Druckschlauches (14) das Druckübertragungsglied (13) anzuheben, damit dieses seinen Kontakt mit dem Transportbandtrum (6a) verliert, wie Fig. 5 zeigt. Es versteht sich, daß solche Federeinrichtungen auch bei der Ausführungsform nach Fig. 2 verwendbar sind.Pressure transmission member (13) and the edge portions (12) of the retaining strip (10) each have a resilient element, which in the present example is formed by a wave-shaped spring band (21). These spring bands are able to raise the pressure transmission member (13) when the pressure hose (14) is depressurized so that it loses contact with the conveyor belt strand (6a), as shown in FIG. 5. It is understood that such spring devices can also be used in the embodiment according to FIG. 2.
In Fig. 6 erkennt man, daß das Druckübertragungsglied (13) in Längsrichtung gegliedert ausgebildet sein kann Eine solche Gliederung, bei der die einzelnen Glieder durch elastische Stege (13c) miteinander verbunden sind, erlaubt eine gleichmäßige Druckbeaufschlagung des Transportbandes (6) und begünstigt auch, wie noch unter Bezugnahme auf Fig. 7 erläutert wird, eine individuelle Druckeinstellung längs des Förderbandtrums (6a).In Fig. 6 it can be seen that the pressure transmission member (13) can be structured in the longitudinal direction Such an arrangement, in which the individual links are connected to one another by elastic webs (13c), allows the conveyor belt (6) to be pressurized evenly and, as will be explained with reference to FIG. 7, also favors individual pressure adjustment along the conveyor belt strand ( 6a).
Die Ausführungsform nach Fig. 7 unterscheidet sich von jener nach Fig. 1 dadurch, daß in einer gemeinsamen Halteleiste (10) mehrere Druckschläuche, im vorliegenden Falle drei Druckschläuche (14a, 14b und 14c) angeordnet sind, die über entsprechende Anschlußstutzen (15a, 15b und 15c) mit 3/2-Wegeventilen (17a, 17b und 17c) verbunden sind. Die Wegeventile (17b, 17c) für den mittleren und hinteren Druckschlauch (14b, 14c) sind direkt mit der Druckquelle (19) verbunden. Demgegenüber ist das Wegeventil (17a) des vorderen Druckschlauches (14a) über ein Druckregelventil (18) indirekt mit der Druckluftquelle (19) verbunden.The embodiment according to FIG. 7 differs from that according to FIG. 1 in that several pressure hoses, in the present case three pressure hoses (14a, 14b and 14c), are arranged in a common retaining strip (10), which are connected via corresponding connecting pieces (15a, 15b and 15c) are connected to 3/2-way valves (17a, 17b and 17c). The directional valves (17b, 17c) for the middle and rear pressure hose (14b, 14c) are connected directly to the pressure source (19). In contrast, the directional valve (17a) of the front pressure hose (14a) is indirectly connected to the compressed air source (19) via a pressure control valve (18).
Mittels eines Steuergerätes (22), mit dem auch der Druck am Druckregelventil (18) eingestellt werden kann, lassen sich die Wegeventile (17a, 17b und 17c) individuell schalte um die zugehörigen Druckschläuche (14a, 14b und 14c) unabhängig voneinander be- oder entlüften zu können. Es versteht sich, daß ggf. auch nur zwei oder auch mehr als drei Druckschläuche in der Halteleiste (10) angeordnet sein können.The directional control valves (17a, 17b and 17c) can be switched individually by means of a control device (22), with which the pressure at the pressure control valve (18) can also be set, to independently operate the associated pressure hoses (14a, 14b and 14c) to be able to vent. It goes without saying that possibly only two or even more than three pressure hoses can be arranged in the holding strip (10).
In den Ausführungsbeispielen nach Fig. 1 und 7 werden die Druckschläuche (14 und 14a-14c) über die Wegeventile (17 und 17a-17c) auf Umgebungsdruck, d. h. atmosphärischen Druck entlüftet. Nach dem Entlüften drücken die schlaffen Druckschläuche aber immer noch mit ihrem Eigengewicht auf das Druckübertragungsglied (13).In the exemplary embodiments according to FIGS. 1 and 7, the pressure hoses (14 and 14a-14c) are vented to ambient pressure, ie atmospheric pressure, via the directional valves (17 and 17a-17c). After venting but still press the slack pressure hoses with their own weight onto the pressure transmission element (13).
Bei der einfacheren Version nach Fig. 2 und 3, bei der keine Federmittel zum Anheben des entlasteten Druckübertragungsgliedes (13) vorgesehen sind, kann es zweckmäßig sein, den Druckschlauch (14) zum Entlüften mit einer Unterdruckquelle, z. B. einer Vakuumkammer zu verbinden. In diesem Fall wird der Druckschlauch (14) durch das Evakuieren an die obere Wand der Halteleiste (10) hochgezogen, wodurch er das Druckübertragungsglied (13) völlig entlastet. Sofern bei evakuiertem Druckschlauch (14) kein Kontakt zwischen dem Druckübertragungsglied (13) und dem Transportband (6) bestehen soll, kann es ferner zweckmäßig sein, das Druckübertragungsglied (13) z. B. durch Kleben mit dem Druckschlauch (14) zu verbinden. In diesem Fall wird das Druckübertragungsglied (13) beim Evakuieren des Druckschlauches (14) vom Trum (6a) des Transportbandes (6) weg mit nach aufwärts gezogen.In the simpler version according to FIGS. 2 and 3, in which no spring means are provided for lifting the relieved pressure transmission member (13), it may be expedient to vent the pressure hose (14) with a vacuum source, e.g. B. to connect a vacuum chamber. In this case, the pressure hose (14) is pulled up by the evacuation to the upper wall of the holding strip (10), whereby it completely relieves the pressure transmission member (13). If there should be no contact between the pressure transmission member (13) and the conveyor belt (6) in the case of an evacuated pressure hose (14), it may also be expedient to pressurize the pressure transmission member (13). B. by gluing with the pressure hose (14). In this case, when the pressure hose (14) is evacuated, the pressure transmission member (13) is pulled away from the run (6a) of the conveyor belt (6).
Schließlich sei erwähnt, daß die Vorschubeinrichtung (5) ggf. mehrere, parallel zueinander verlaufende Transportbänder aufweisen kann, denen je eine eigene Andruckvorrichtung zugeordnet ist. Finally, it should be mentioned that the feed device (5) can optionally have a plurality of conveyor belts running parallel to one another, each of which is assigned its own pressure device.

Claims

Patentansprüche Claims
1. Vorschubeinrichtung für auf einer Auflage entlangbewegbare flexible Werkstücke mit wenigstens einem endlosen angetriebenen Transportband und einer ein Trum des Transportbandes in Richtung der Auflage drückenden Andruckvorrichtung, die einen parallel zum anzudrückenden Transportbandtrum angeordneten Träger, wenigstens ein die Andruckkraft erzeugendes Andruckmittel und ein mit dem Werkstück in Berührung tretendes flexibles Druckübertragungsglied aufweist, d a d u r c h g e k e n n z e i c h n e t, daß der Träger als eine kastenförmige, das Andruckmittel aufnehmende, unten offene Halteleiste (10) ausgebildet und das Andruckmittel von einem aufblasbaren Druckschlauch (14; 14a - 14c) gebildet ist, der über ein Wegeventil (17; 17a - 17c) mit einer Druckluftquelle (19) verbunden ist.1. Feed device for flexible workpieces that can be moved along a support with at least one endless driven conveyor belt and a pressing device that presses a strand of the conveyor belt in the direction of the support, that has a carrier arranged parallel to the conveyor belt strand to be pressed, at least one pressing means that generates the pressing force and one with the workpiece in Touching flexible pressure transmission element, characterized in that the carrier is designed as a box-shaped, open at the bottom holding strip receiving the pressure means and the pressure means is formed by an inflatable pressure hose (14; 14a - 14c) which is connected via a directional valve (17; 17a - 17c) is connected to a compressed air source (19).
2. Vorschubeinrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß in der Halteleiste (10) mehrere Druckschläuche (14a - 14c) in Längsrichtung hintereinander angeordnet sind, die über unabhängig voneinander steuerbare Wegeventile (17a - 17c) beaufschlagbar sind.2. Feed device according to claim 1, so that a plurality of pressure hoses (14a - 14c) are arranged one behind the other in the longitudinal direction in the holding bar (10) and can be acted upon by independently controllable directional valves (17a - 17c).
3. Vorschubeinrichtung nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß die Größe des in einem oder mehreren der Druckschläuche (14; 14a - 14c) herrschenden Druckes steuerbar ist. 3. Feed device according to claim 1 or 2, characterized in that the size of the pressure prevailing in one or more of the pressure hoses (14; 14a - 14c) is controllable.
4. Vorschubeinrichtung nach Anspruch 3, d a d u r c h g e k e n n z e i c h n e t, daß zur Veränderung der Druckgröße ein elektrisch gesteuertes Druckregelventil (18) verwendet wird.4. Feed device according to claim 3, d a d u r c h g e k e n n z e i c h n e t that an electrically controlled pressure control valve (18) is used to change the pressure size.
Vorschubeinrichtung nach einem oder mehreren der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die Halteleiste (10) an ihrem unteren längslaufenden Rand nach innen gerichtete Randabschnitte (12) aufweist, auf denen das Druckübertragungsglied (13) abgestützt ist.Feed device according to one or more of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the holding strip (10) has at its lower longitudinal edge inwardly directed edge portions (12) on which the pressure transmission member (13) is supported.
6. Vorschubeinrichtung nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , daß das anzudrückende Transportbandtrum (6a) zwischen den nach innen gerichteten Randabschnitten (12) der Halteleiste (10) geführt ist.6. Feed device according to claim 5, so that the conveyor belt strand (6a) to be pressed is guided between the inwardly directed edge sections (12) of the retaining strip (10).
Vorschubeinrichtung nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , daß das Druckübertragungsglied (13) ein profilierter Körper ist, der einen aus der Halteleiste (10) nach unten vorstehenden Abschnitt (13a) und innerhalb der Halteleiste (10) seitliche Randstreifen (13b) aufweist, die von den Randabschnitten (12) der Halteleiste (10) abgestützt sind. Feed device according to Claim 5, characterized in that the pressure transmission member (13) is a profiled body which has a section (13a) which projects downward from the holding strip (10) and within the holding strip (10) has lateral edge strips (13b) which are different from those Edge sections (12) of the retaining strip (10) are supported.
8. Vorschubeinrichtung nach einem oder mehreren der vorhergehenden Ansprüche 5 bis 7, d a d u r c h g e k e n n z e i c h n e t , daß zwischen den Randabschnitten (12) der Halteleiste (10) und dem von ihnen abgestützten Druckübertragungsglied (13) Federelemente (21) angeordnet sind, die im drucklosen Zustand des bzw, der Druckschläuche (14, 14a - 14c) das Druckübertragungsglied (13) anheben.8. Feed device according to one or more of the preceding claims 5 to 7, characterized in that between the edge portions (12) of the retaining strip (10) and the pressure transmission member (13) supported by them, spring elements (21) are arranged, which in the unpressurized state of the , the pressure hoses (14, 14a - 14c) lift the pressure transmission element (13).
9. Vorschubeinrichtung nach Anspruch 8, d a d u r c h g e k e n n z e i c h n e t , daß die Federelemente von Federbändern (21) gebildet sind.9. Feed device according to claim 8, d a d u r c h g e k e n n z e i c h n e t that the spring elements are formed by spring bands (21).
10. Vorschubeinrichtung nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , daß die Federbänder (21) wellenförmig sind.10. Feed device according to claim 9, d a d u r c h g e k e n n z e i c h n e t that the spring bands (21) are wave-shaped.
11. Vorschubeinrichtung nach einem oder mehreren der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß das Druckübertragungsglied (13) aus PTFE besteht oder auf seiner dem Transportbandtrum (6a) zugewandten Seite mit PTFE beschichtet ist.11. Feed device according to one or more of the preceding claims, that the pressure transmission member (13) consists of PTFE or is coated on its side facing the conveyor belt strand (6a) with PTFE.
12. Vorschubeinrichtung nach einem oder mehreren der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß das Wegeventil (17) bzw. die Wegeventile (17a - 17c) mit einer Unterdruckquelle verbunden ist bzw. sind, mittels der der Druckschlauch (14) bzw. die Druckschläuche (14a - 14c) evakuierbar ist bzw. sind. 12. Feed device according to one or more of the preceding claims, characterized in that the directional control valve (17) or the directional control valves (17a - 17c) is or are connected to a vacuum source by means of which the pressure hose (14) or the pressure hoses (14a - 14c) is or can be evacuated.
13. Vorschubeinrichtung nach einem oder mehreren der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t, daß sie an einem eine Nähmaschine (3) aufweisenden Nähaggregat verwendet wird, bei dem die Auflage für das Werkstück von einer Tischplatte (2) gebildet ist. 13. Feed device according to one or more of the preceding claims, that it is used on a sewing unit having a sewing machine (3), in which the support for the workpiece is formed by a table top (2).
PCT/EP1989/000292 1988-03-25 1989-03-18 Feed device for flexible workpieces WO1989009299A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3810132.7 1988-03-25
DE3810132A DE3810132C1 (en) 1988-03-25 1988-03-25 Feed device for flexible workpieces

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WO1989009299A1 true WO1989009299A1 (en) 1989-10-05

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WO (1) WO1989009299A1 (en)

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US5188044A (en) * 1991-02-25 1993-02-23 Durkopp Adler Aktiengesellschaft Folding device for sewing a second workpiece onto a first workpiece in an automatic sewing machine
EP2078686A1 (en) * 2008-01-10 2009-07-15 Renholmens Mekaniska Verkstad AB Feed arrangement
JP2015039629A (en) * 2013-08-23 2015-03-02 啓翔股▲ふん▼有限公司 Transfer device of sewing machine

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DE10225865A1 (en) 2002-04-09 2003-10-23 Heidelberger Druckmasch Ag Device for packing flat objects in transport containers, in particular flat folded boxes in outer cartons
DE10225868A1 (en) * 2002-04-09 2003-10-23 Heidelberger Druckmasch Ag Device for packing flat objects in transport containers, in particular flat folded boxes in outer cartons
DE10225646A1 (en) 2002-04-09 2003-10-23 Heidelberger Druckmasch Ag Device for packing flat objects in transport containers, in particular flat folded boxes in outer cartons
DE10225867A1 (en) 2002-04-09 2003-10-23 Heidelberger Druckmasch Ag Device for packing flat objects in transport containers, in particular flat folded boxes in outer cartons
ITBO20030024A1 (en) * 2003-01-17 2004-07-18 Canti & Figli Srl PROCEDURE AND MACHINE FOR COATING ELEMENTS
US9010755B2 (en) 2012-07-18 2015-04-21 Francotyp-Postalia Gmbh Printer apparatus
DE102012014901A1 (en) * 2012-07-18 2014-05-15 Francotyp-Postalia Gmbh Pressure device for flat objects to a circulating conveyor belt
CN109693974B (en) * 2019-01-31 2023-08-08 南通宏泰机械制造有限公司 Vertical full yarn hoisting device

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EP2078686A1 (en) * 2008-01-10 2009-07-15 Renholmens Mekaniska Verkstad AB Feed arrangement
JP2015039629A (en) * 2013-08-23 2015-03-02 啓翔股▲ふん▼有限公司 Transfer device of sewing machine

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Publication number Publication date
IT8967213A0 (en) 1989-03-24
DE3810132C1 (en) 1989-09-28
IT1232055B (en) 1992-01-23

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