EP3521498B1 - Method and device for preventing stitches placed imprecisely on the stitch base of a sewing machine - Google Patents

Method and device for preventing stitches placed imprecisely on the stitch base of a sewing machine Download PDF

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Publication number
EP3521498B1
EP3521498B1 EP18209074.6A EP18209074A EP3521498B1 EP 3521498 B1 EP3521498 B1 EP 3521498B1 EP 18209074 A EP18209074 A EP 18209074A EP 3521498 B1 EP3521498 B1 EP 3521498B1
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EP
European Patent Office
Prior art keywords
embroidery
holding means
ground
creel
gate
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EP18209074.6A
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German (de)
French (fr)
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EP3521498A1 (en
Inventor
Franz Lässer
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Laesser AG
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Laesser AG
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C9/00—Appliances for holding or feeding the base fabric in embroidering machines
    • D05C9/08—Appliances for holding or feeding the base fabric in embroidering machines in machines with horizontal needles
    • D05C9/10—Work holders or carriers
    • D05C9/12—Holding or stretching arrangements for the base fabric in embroidery work holders
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C9/00—Appliances for holding or feeding the base fabric in embroidering machines
    • D05C9/22—Adjusting or registering devices for the base fabric, e.g. for alignment with respect to the needles
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C13/00—Auxiliary devices incorporated in embroidering machines, not otherwise provided for; Ancillary apparatus for use with embroidering machines
    • D05C13/02—Counting, measuring, indicating, warning, or safety devices

Definitions

  • the subject matter of the invention is a method for preventing imprecisely placed stitches on the embroidery ground of an embroidery machine according to the preamble of patent claim 1 and a device for preventing imprecisely placed stitches on the embroidery ground of an embroidery machine according to the preamble of patent claim 4.
  • Modern embroidery machines are able to set 700 stitches per minute in an embroidery base that is stretched on the frame of an embroidery machine. More than 1,000 needles can be arranged on such an embroidery machine, which are distributed at regular intervals over a length of 30 meters or more. Consequently, the embroidery ground, ie a fabric clamped in the creel, is correspondingly long and weighs several kilograms. Due to the movement of the gate with each stitch, at least in one or simultaneously in both directions X and Y, the embroidery ground shifts due to its inertia in the X and/or Y direction in such a way that the length of the stitches set over the entire length of the embroidery ground can be different. In the The changes in length are smallest in the edge areas at the top/bottom and left/right at the ends.
  • This trailing of the embroidery ground can also have a negative effect on the needles if they move transversely to the needle during the puncture of the embroidery ground. Even the smallest stitch length changes can be noticed and the aesthetics of the embroidered workpiece can have a negative effect.
  • an embroidery machine gate with side clamping bars is known.
  • the side tension bars are composed of individual segments and thus make it possible to keep the embroidery ground taut when waving or they prevent the embroidery ground from having to be stretched out again at the side after waving.
  • these known elements cannot prevent the embroidery base from suffering during the embroidering of an embroidery pattern due to the inertia of the mass of the s38tick base caused by the creel movement.
  • a multi-needle head embroidery machine is also known in which the embroidery ground is pressed against the needle hole plate during drilling in order to hold the embroidery ground around the hole to be produced and to prevent it from being drawn into the hole.
  • the presser foot is lifted and the embroidery base can therefore be moved freely.
  • a presser foot is also known, as is also used in household sewing machines or sewing machines in general.
  • the presser foot with a foot with a central opening is used to press the fabric onto the needle plate during insertion of the needles and in particular during retraction of the needle. After the stitch is finished and while the fabric is moving the length of the stitch, the presser foot remains raised and the fabric is during this Time not kept and can consequently move uncontrolled in the x, y and z direction.
  • a thread cutting and clamping device for an embroidery machine is also known.
  • a fabric presser is also disclosed there, which comes to lie between two needles and presses the embroidery base onto the needle hole plate while the needles are being inserted and pulled back.
  • the embroidery ground is not held during the displacement of the embroidery ground by a stitch length and can therefore not follow due to the inertia of the mass of the embroidery ground due to the high speed of the gate movement and consequently uncontrollably offset stitches can be set, which lead to an impairment of the lead embroidery picture.
  • the high number of stitches (for example 720 stitches per minute, ie 12 stitches per second) can lead to vibrations in the Z-direction, ie perpendicular to the surface of the embroidery ground. Since the embroidery ground is not directly on the needle plate, the fabric presser presses the embroidery ground 12 times per second in direction x against the needle plate and releases it again. These movements can also affect the embroidery image. Such undesired movements of the embroidery ground occur to an increased extent when the usual clamping distance of the embroidery ground between the two horizontal winding shafts becomes larger. In order to make embroidery machines even more efficient, embroidery machines with embroidery areas up to 2.8 meters in height without renewed corrugation have become known. In other words, the embroidery ground clamped between the two winding shafts makes due to inertia Movements in the x, y, and z directions increase problems.
  • An object of the present invention is to create a method and a device with which the undesired movements in the X, Y and Z directions can be prevented or at least reduced to an acceptable level invisible to the eye, so that the stitch base is invisible over the entire embroidery area between the winding shafts and the side tension rods can be embroidered with exactly identical stitch lengths.
  • the calming of the embroidery ground or the prevention of the embroidery ground shifting beyond the extent of the gate movement due to its inertia due to the gate movements is remedied by the fact that holding means rigidly connected to the gate are carried along, which act on the embroidery ground and move it in X - and Y-direction with respect to the gate immovable.
  • the embroidery ground also in the Z-direction, i.e. perpendicular to the plane of the fabric, and prevents undesired fluttering.
  • pin cushions are formed on the spaced holding means, the fine needles of which are pushed through or pierced through the embroidery base.
  • the holding means are carried on the already existing gate supports, which are arranged at regular intervals along the embroidery machine in the gate.
  • the pincushion can be extended in the vertical direction (Z-direction) towards the embroidery base and thus hold it in position exactly synchronous to the movements of the creel.
  • the embroidery ground can no longer move horizontally due to the inertia of the mass and, in the case of vertical movements, in the vertical direction relative to the gate. If the pincushion is advanced so far that the embroidery ground is slightly shifted in the Z-direction out of the plane between the winding shafts of the embroidery ground, vibrations in the Z-direction can also be reduced.
  • the pincushion is pulled away from the embroidery ground in the Z-direction until the needles have left the embroidery ground, and is also pivoted about a horizontal pivot axis in order to lie further away from the embroidery ground on the gate support.
  • the holding means could also be pivoted laterally about a vertical axis. However, this is less advantageous since it would reduce the gaps between the gate supports and thus reduce the maximum side travel.
  • the holding means can be mechanically moved into the working position, i.e. perpendicular to the embroidery base, and their pin cushions can be moved out and back in the direction of the embroidery base pneumatically or in some other way.
  • other cushions that have a high coefficient of friction with the embroidery base can also be attached to the holding means in the second embodiment, such as cushions made of rubber, Velcro strips, foam and the like, which prevent the embroidery base from sliding in the X and Y direction.
  • reference numeral 1 denotes a gate tower. This stands on a foundation 25 or on a Schifflibock 3 of the rear carriage, which contains the drive elements for the shuttle (not shown) and for setting the width of the carriage, as well as the drive means for the gate height drive.
  • a rail 5 is fastened to the gate tower 1, on which two or more carriages 7 are mounted so that they can be moved vertically.
  • the carriages 7 carry gate supports 11 fastened in the gate 9 and on the gate 9.
  • the upper winding shaft 13 is arranged in the upper region of the gate 9 and the lower winding shaft 15 is arranged at the lower end and is shown schematically. Between the two winding shafts 13, 15 runs an embroidery base 17 stretched between these winding shafts. This is shown with a dot-dash line.
  • FIG. 1 An upper holding means 19a and a lower holding means 19b can be seen. Between the two holding means 19a and 19b, the shuttle tracks 21, also called Stöckli, are shown schematically without their drives.
  • area A is shown on an enlarged scale in figure 1 shown.
  • the second holding means 19b below the shuttle track 21 is identical to the first-mentioned one and is fastened upside down to the gate support 11 (area B in figure 1 ).
  • a linear drive 29 for example a pneumatic or hydraulic cylinder or a spindle that can be driven by an electric motor, a boom 31 can be pivoted about a pivot axis q from a rest position parallel to the gate support 11 (cf Figures 3 and 4 in a working position perpendicular to it according to figures 1 , 2 , 5 and 6 ).
  • the cantilever 31, which is mounted on the axis q, comprises a support with two parallel cheeks 33, on which a second linear drive arrangement 35 is attached, on the drive rods 37 of which a pin cushion 39 is attached ( Figures 2 to 4 ).
  • the drive rods 37 are mounted in the cheeks 33 in a longitudinally displaceable manner.
  • the pin cushion 39 fixed to the free end of the drive rods 37, comprises a support plate 43 carrying the pins 41. The latter lies at rest, preferably within the volume of the casing 27 between the cheeks 33, so that the needles 41 do not protrude the latter and are protected against damage and do not pose a risk of injury to the operators.
  • the first linear drive 29 is mounted pivotably on a bearing pin 45 .
  • the bearing pin 45 is held by a mounting plate 47 .
  • the mounting plate 47 is fixed to the gate post 11 with screws 49 .
  • a large number of bores for the screws 49 can be provided on the gate supports in order to be able to fasten the holding means 19 at suitable points.
  • a piston rod 51 protrudes from the top of the first linear drive 29.
  • a joint head 53 which engages in a shaft 55, is fastened to it.
  • the shaft 55 is fastened at its ends in the side walls 27' and 27'' forming the casing 27.
  • the casing 27 can consequently be pivoted about the axis q with the first linear drive 29.
  • a bolt 57 is seated on the axis q, at both ends of which a plate 59, for example in the shape of a rhombus, is fastened in a rotationally fixed manner.
  • the plate 59 is screwed at its ends to the side walls 27' and 27'' by screws 61.
  • the rear end of the bolt 57 is connected to the fastening plate 47.
  • the two linear drives 29, 35 are connected by hoses or lines to the associated compressed air sources or electrical switches. The latter are not shown.
  • the needle cushion 39 arranged in the casing 27 is pivoted by an angle of 90° with the first linear drive 29 .
  • the 90° angle is preferably precisely defined by an end stop 63 on the mounting plate 47 . Then the pincushion 39 with the needles 41 on the holding plate 43 is pushed in the Z direction perpendicularly to the embroidery base 17 .
  • the fine needles 41 penetrate the embroidery base 17 and, if desired, can also press it slightly in the Z direction, for example by a few millimeters, to the right in the Z direction. This ensures that the embroidery base 17 does not become detached from the needles 41 during the embroidering as a result of any vibrations of the creel 9 running in the Z direction.
  • the gate 9 with the gate supports 11 fixedly arranged thereon is moved in the X and/or Y direction, i.e. horizontally and vertically, in a conventional manner in order to carry out a correspondingly programmed embroidery on the embroidery base 17 or its stitches and the to allow length between stitches. Since the holding means 19 with the pin cushion 39 now executes exactly the same movement as the gate 9, the embroidery base 17 can no longer move strongly relative to the gate 9 despite high accelerations and decelerations. As a result, the embroidery base 17 is always kept exactly positioned in relation to the gate 9 .
  • a holding means 19 is always arranged above and below the embroidery area on the creel supports, it is ensured that in the embroidery area, here an area running over the entire length of the embroidery machine, can be stabilized.
  • the lower pin cushions 39 When changing from the upper to the lower embroidery area, only the lower pin cushions 39 have to be withdrawn from the embroidery base 17 and the gate 9 has to be shifted by the width of the area to be subsequently embroidered.
  • the needles 41 then move back into the embroidery base 17 and hold it in position during further processing by the embroidery machine.
  • rubber plates, nubs, hook tapes, loop tapes, foam rubber plates or other cushions can also be fastened as retaining elements on the retaining plate 43, which prevent damage to the embroidery base 17, especially with very finely designed embroidery base materials, but still hold it.
  • a suitable telescopic rail or a telescopic tube would also be conceivable, at the end of which the pin cushions 39 are attached. This would eliminate the pivoting movement.

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

Description

Gegenstand der Erfindung ist ein Verfahren zur Verhinderung von ungenau auf dem Stickgrund einer Stickmaschine gesetzten Stichen gemäss Oberbegriff des Patentanspruchs 1 und eine Vorrichtung zur Verhinderung von ungenau gesetzten Stichen auf dem Stickgrund einer Stickmaschine gemäss Oberbegriff des Patentanspruchs 4.The subject matter of the invention is a method for preventing imprecisely placed stitches on the embroidery ground of an embroidery machine according to the preamble of patent claim 1 and a device for preventing imprecisely placed stitches on the embroidery ground of an embroidery machine according to the preamble of patent claim 4.

Moderne Stickmaschinen sind in der Lage 700 Stiche pro Minute in einen Stickgrund, der auf dem Gatter einer Stickmaschine aufgespannt ist, zu setzen. Auf einer solchen Stickmaschine können über 1.000 Nadeln angeordnet sein, die sich auf einer Länge von 30 und mehr Meter in regelmässigen Abständen verteilen. Folglich ist auch der Stickgrund, d.h. ein im Gatter eingespannter Stoff, entsprechend lang und weist ein Gewicht von mehreren Kilogramm auf. Durch die Bewegung des Gatters bei jedem Stich, mindestens in einer oder gleichzeitig in beiden Richtungen X und Y, verschiebt sich der Stickgrund infolge seiner Trägheit in X und/oder Y Richtung derart, dass dadurch die Länge der gesetzten Stiche über die gesamte Länge des Stickgrunds unterschiedlich sein können. In den Randbereichen oben/unten und links/rechts an den Enden sind die Längenänderungen am kleinsten. Dieses Nachlaufen des Stickgrunds vor allem in der Mitte kann sich auch negativ auf die Nadeln auswirken, wenn diese durch den sich während des Einstichs in den Stickgrund letzterer quer zur Nadel bewegt. Auch kleinste Stichlängenveränderungen können wahrgenommen werden und die Ästhetik des gestickten Werkstücks kann sich dadurch negativ auswirken.Modern embroidery machines are able to set 700 stitches per minute in an embroidery base that is stretched on the frame of an embroidery machine. More than 1,000 needles can be arranged on such an embroidery machine, which are distributed at regular intervals over a length of 30 meters or more. Consequently, the embroidery ground, ie a fabric clamped in the creel, is correspondingly long and weighs several kilograms. Due to the movement of the gate with each stitch, at least in one or simultaneously in both directions X and Y, the embroidery ground shifts due to its inertia in the X and/or Y direction in such a way that the length of the stitches set over the entire length of the embroidery ground can be different. In the The changes in length are smallest in the edge areas at the top/bottom and left/right at the ends. This trailing of the embroidery ground, especially in the middle, can also have a negative effect on the needles if they move transversely to the needle during the puncture of the embroidery ground. Even the smallest stitch length changes can be noticed and the aesthetics of the embroidered workpiece can have a negative effect.

Aus der EP 0 919 657 ist ein Stickmaschinengatter mit Seitenspannleisten bekannt. Die Seitenspannleisten sind aus einzelnen Segmenten zusammengesetzt und ermögliche dadurch, den Stickgrund beim Wellen gespannt zu halten bzw. sie vermeiden, dass nach dem Wellen der Stickgrund seitlich erneut wieder aufgespannt werden muss. Bei Grossstickmaschinen, die bis zu 1000 Nadeln und einer Gatterhöhe von 2,5 Metern kann mit diesen bekannten Elementen der Stickgrund während des Stickens eines Stickmusters nicht daran gehindert werden, dass durch die Trägheit der Masse des S38tickgrundes durch die Gatterbewegung die Stickgenauigkeit leidet.From the EP 0 919 657 an embroidery machine gate with side clamping bars is known. The side tension bars are composed of individual segments and thus make it possible to keep the embroidery ground taut when waving or they prevent the embroidery ground from having to be stretched out again at the side after waving. With large embroidery machines that have up to 1000 needles and a creel height of 2.5 meters, these known elements cannot prevent the embroidery base from suffering during the embroidering of an embroidery pattern due to the inertia of the mass of the s38tick base caused by the creel movement.

Aus der EP 2 314 746 A1 ist weiter eine Mehrkopfstickmaschine und ein Spannrahmen dafür bekannt. Beim Stoffwellen kann mit einer eigeführten Klemmleiste der beendete Stickabschnitt gehalten und für das Wiederansticken an der exakt gleichen Stelle positioniert werden. An Grossstickmaschinen mit einer Länge bis zu 30m und mehr lassen sich keine Klemmleisten einführen, insbesondere da bei Grossstickmaschinen der Stickgrund vertikal angeordnet zwischen zwei Stoffwellen gehalten wird und keine über die gesamte Fläche des Stickgrunds verlaufende Auflageplatte vorhanden ist.From the EP 2 314 746 A1 is further known a multi-head embroidery machine and a tenter for it. When fabric waving, the finished embroidery section can be held with an inserted clamping bar and for that Embroidered again can be positioned in exactly the same place. Clamping strips cannot be inserted on large embroidery machines with a length of up to 30m and more, especially since the embroidery ground is held vertically between two fabric shafts in large embroidery machines and there is no support plate running over the entire surface of the embroidery ground.

Aus der EP 2 381 023 ist weiter eine Mehrnadelkopfstickmaschine bekannt, bei welcher während des Bohrens der Stickgrund an die Stichlochplatte angedrückt wird, um den Stickgrund um das zu erzeugende Loch festzuhalten und dieses daran zu hindern, in das Loch eingezogen zu werden. Während des Stickens, d.h. also nach dem Anbringen des Lochs, ist der Stoffdrücker abgehoben und dadurch der Stickgrund frei beweglich.From the EP 2 381 023 a multi-needle head embroidery machine is also known in which the embroidery ground is pressed against the needle hole plate during drilling in order to hold the embroidery ground around the hole to be produced and to prevent it from being drawn into the hole. During the embroidering, ie after the hole has been made, the presser foot is lifted and the embroidery base can therefore be moved freely.

Aus der EP 2 762 625 ist weiter ein Stoffdrücker bekannt, wie er auch bei Haushaltnähmaschinen oder generell Nähmaschinen eingesetzt wird. Der Stoffdrücker mit einem Fuss mit einer zentralen Öffnung wird während des Einstechens der Nadeln und insbesondere beim Zurückziehen der Nadel dazu benutzt, den Stoff auf die Stichlochplatte zu drücken. Nach Beendigung des Stiches und während des Verschiebens des Stoffs über die Stichlänge bleibt der Stoffdrücker angehoben und der Stoff ist während dieser Zeit nicht gehalten und kann sich folglich in x-, y- und z-Richtung unkontrolliert bewegen.From the EP 2 762 625 a presser foot is also known, as is also used in household sewing machines or sewing machines in general. The presser foot with a foot with a central opening is used to press the fabric onto the needle plate during insertion of the needles and in particular during retraction of the needle. After the stitch is finished and while the fabric is moving the length of the stitch, the presser foot remains raised and the fabric is during this Time not kept and can consequently move uncontrolled in the x, y and z direction.

Aus der WO2018/015100 ist weiter eine Fadenschneid- und Klemmvorrichtung für eine Stickmaschine bekannt. Wie bei allen Grossstickmaschinen ist auch dort ein Stoffdrücker offenbart, der zwischen jeweils zwei Nadeln zu liegen kommt und während des Einstechens und Zurückziehens der Nadeln den Stickgrund auf die Stichlochplatte drückt. Wie bei der vorgenannten Schrift ist der Stickgrund während des Verschiebens des Stickgrunds um eine Stichlänge nicht gehalten und kann somit durch die Trägheit der Masse des Stickgrunds infolge der hohen Geschwindigkeit der Gatterbewegung nicht folgen und folglich können unkontrollierbar versetzte Stiche gesetzt werden, die zu einer Beeinträchtigung des Stickbildes führen.From the WO2018/015100 a thread cutting and clamping device for an embroidery machine is also known. As with all large embroidery machines, a fabric presser is also disclosed there, which comes to lie between two needles and presses the embroidery base onto the needle hole plate while the needles are being inserted and pulled back. As in the aforementioned document, the embroidery ground is not held during the displacement of the embroidery ground by a stitch length and can therefore not follow due to the inertia of the mass of the embroidery ground due to the high speed of the gate movement and consequently uncontrollably offset stitches can be set, which lead to an impairment of the lead embroidery picture.

Die hohe Stichzahl (zum Beispiel 720 Stiche pro Minute, d.h. 12 Stiche pro Sekunde) kann zu Schwingungen in Z-Richtung, d.h. lotrecht zur Oberfläche des Stickgrunds, führen. Da der Stickgrund nicht unmittelbar auf der Stichplatte aufliegt, drückt der Stoffdrücker den Stickgrund 12x pro Sekunde in Richtung x an die Stichplatte und löst diesen wieder. Auch diese Bewegungen können das Stickbild beeinträchtigen. Solche unerwünschten Bewegungen des Stickgrunds treten in erhöhtem Masse auf, wenn die übliche Einspanndistanz des Stickgrunds zwischen den beiden horizontal verlaufenden Wickelwellen grösser wird. Um die Stickmaschinen noch effizienter zu gestalten, sind Stickmaschinen mit Stickflächen ohne erneutes Nachwellen bis zu 2,8 Meter Höhe bekannt geworden. Mit anderen Worten, der zwischen den beiden Wickelwellen eingespannte Stickgrund macht durch Trägheit verursachte Bewegungen in den x-, y- und z-Richtungen in verstärktem Masse Probleme.The high number of stitches (for example 720 stitches per minute, ie 12 stitches per second) can lead to vibrations in the Z-direction, ie perpendicular to the surface of the embroidery ground. Since the embroidery ground is not directly on the needle plate, the fabric presser presses the embroidery ground 12 times per second in direction x against the needle plate and releases it again. These movements can also affect the embroidery image. Such undesired movements of the embroidery ground occur to an increased extent when the usual clamping distance of the embroidery ground between the two horizontal winding shafts becomes larger. In order to make embroidery machines even more efficient, embroidery machines with embroidery areas up to 2.8 meters in height without renewed corrugation have become known. In other words, the embroidery ground clamped between the two winding shafts makes due to inertia Movements in the x, y, and z directions increase problems.

Eine Aufgabe der vorliegenden Erfindung ist die Schaffung eines Verfahrens sowie einer Vorrichtung mit denen die unerwünschten Bewegungen in X-, Y- und Z-Richtung verhindert oder zumindest auf ein akzeptables für das Auge unsichtbares Mass verkleinerbar sind, so dass der Stichgrund über den gesamten Stickbereich zwischen den Wickelwellen und den seitlichen Spannstäben mit exakt identischen Stichlängen bestickt werden kann.An object of the present invention is to create a method and a device with which the undesired movements in the X, Y and Z directions can be prevented or at least reduced to an acceptable level invisible to the eye, so that the stitch base is invisible over the entire embroidery area between the winding shafts and the side tension rods can be embroidered with exactly identical stitch lengths.

Gelöst wird diese Aufgabe durch ein Verfahren gemäss den Merkmalen des Patentanspruchs 1 sowie eine Vorrichtung gemäss den Merkmalen des Patentanspruchs 4.This object is achieved by a method according to the features of patent claim 1 and a device according to the features of patent claim 4.

Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen umschrieben.Advantageous configurations of the invention are described in the dependent claims.

Die Beruhigung des Stickgrunds bzw. die Verhinderung, dass der Stickgrund wegen der Gatterbewegungen durch seine Trägheit sich über das Mass der Gatterbewegung hinaus verschiebt, wird dadurch behoben, dass starr mit dem Gatter verbundene Haltemittel mitgeführt werden, die auf den Stickgrund einwirken und diesen in X- und Y-Richtung bezüglich des Gatters unverschiebbar festhalten. Zusätzlich wird der Stickgrund auch in Z-Richtung, das heisst senkrecht zur Stoffebene gehalten und ein unerwünschtes Flattern verhindert.The calming of the embroidery ground or the prevention of the embroidery ground shifting beyond the extent of the gate movement due to its inertia due to the gate movements is remedied by the fact that holding means rigidly connected to the gate are carried along, which act on the embroidery ground and move it in X - and Y-direction with respect to the gate immovable. In addition, the embroidery ground also in the Z-direction, i.e. perpendicular to the plane of the fabric, and prevents undesired fluttering.

In einer ersten Ausführungsform sind an den beabstandet angeordneten Haltemitteln Nadelkissen ausgebildet, deren feine Nadeln durch den Stickgrund hindurch geschoben bzw. eingestochen werden. Die Haltemittel sind an den ohnehin vorhandenen Gatterstützen, die in gleichmässigen Abständen entlang der Stickmaschine im Gatter angeordnet sind, getragen. Die Nadelkissen sind in senkrechter Richtung (Z-Richtung) auf den Stickgrund hin ausfahrbar und halten diese somit positionsgenau synchron zu den Bewegungen des Gatters fest. Durch die Anordnung einer Mehrzahl solcher Haltemittel entlang der Stickmaschine, kann der Stickgrund infolge Trägheit der Masse sich nicht mehr horizontal und bei vertikalen Bewegungen in vertikaler Richtung relativ zum Gatter bewegen. Wird das Nadelkissen soweit vorgeschoben, dass der Stickgrund leicht in Z-Richtung aus der dem Stickgrund eigenen Ebene zwischen den Wickelwellen verschoben wird, so können auch Schwingungen in Z-Richtung verringert werden.In a first embodiment, pin cushions are formed on the spaced holding means, the fine needles of which are pushed through or pierced through the embroidery base. The holding means are carried on the already existing gate supports, which are arranged at regular intervals along the embroidery machine in the gate. The pincushion can be extended in the vertical direction (Z-direction) towards the embroidery base and thus hold it in position exactly synchronous to the movements of the creel. By arranging a plurality of such holding means along the embroidery machine, the embroidery ground can no longer move horizontally due to the inertia of the mass and, in the case of vertical movements, in the vertical direction relative to the gate. If the pincushion is advanced so far that the embroidery ground is slightly shifted in the Z-direction out of the plane between the winding shafts of the embroidery ground, vibrations in the Z-direction can also be reduced.

Um alle Bereiche des Stickgrunds zwischen den Wickelwellen ohne Umspannen bzw. Nachwellen bearbeiten zu können, sind jeweils an jeder Gatterstütze zwei in einem Abstand übereinander, angeordnete Haltemittel befestigt.In order to be able to process all areas of the embroidery base between the winding shafts without re-clamping or re-waving, two holding means arranged at a distance one above the other are fastened to each creel support.

Um ein Haltemittel ausser Betrieb zu setzen, wird das Nadelkissen in Z-Richtung vom Stickgrund weggezogen, bis die Nadeln den Stickgrund verlassen haben, und zudem um eine horizontale Schwenkachse geschwenkt um weiter von Stickgrund entfernt an der Gatterstütze zu liegen. Selbstverständlich könnten die Haltemittel auch um eine vertikale Achse seitlich verschwenkt werden. Dies ist allerdings weniger vorteilhaft, da dadurch die Zwischenräume zwischen den Gatterstützen verkleinert würden und so der maximale Seitenweg reduziert wird. Die Haltemittel sind mechanisch in die Arbeitslage, d.h. lotrecht zum Stickgrund schwenkbar und deren Nadelkissen können pneumatisch oder anderweitig in Richtung des Stickgrundes aus- und zurückgefahren werden.In order to put a holding means out of operation, the pincushion is pulled away from the embroidery ground in the Z-direction until the needles have left the embroidery ground, and is also pivoted about a horizontal pivot axis in order to lie further away from the embroidery ground on the gate support. Of course, the holding means could also be pivoted laterally about a vertical axis. However, this is less advantageous since it would reduce the gaps between the gate supports and thus reduce the maximum side travel. The holding means can be mechanically moved into the working position, i.e. perpendicular to the embroidery base, and their pin cushions can be moved out and back in the direction of the embroidery base pneumatically or in some other way.

Alternativ zu Nadelkissen können in der zweiten Ausführungsform an den Haltemitteln auch andere einen hohen Reibkoeffizient mit dem Stickgrund aufweisende Kissen befestigt sein, wie beispielsweise Kissen aus Gummi, Klettbänder, Schaumstoff und dergleichen, welche das Gleiten in X-und Y-Richtung des Stickgrunds verhindern.As an alternative to pin cushions, other cushions that have a high coefficient of friction with the embroidery base can also be attached to the holding means in the second embodiment, such as cushions made of rubber, Velcro strips, foam and the like, which prevent the embroidery base from sliding in the X and Y direction.

Anhand eines illustrierten Ausführungsbeispiels wird die Erfindung näher erläutert. Es zeigen:

Figur 1
einen Vertikalschnitt durch eine Stickmaschine im Bereich einer Gatterstütze,
Figur 2
eine perspektivische Detailansicht in Figur 1 mit einem Haltemittel,
Figur 3
eine Ansicht des Haltemittels an einer Gatterstütze in Ruhestellung,
Figur 4
eine Seitenansicht des Haltemittels an einer Gatterstütze gemäss Figur 3,
Figur 5
eine Seitenansicht des ausgeschwenkten Haltemittels und
Figur 6
eine Seitenansicht des ausgeschwenkten Haltemittels in Funktionsstellung mit ausgefahrenem Nadelkissen.
The invention is explained in more detail on the basis of an illustrated exemplary embodiment. Show it:
figure 1
a vertical section through an embroidery machine in the area of a gate support,
figure 2
a detailed perspective view figure 1 with a holding device,
figure 3
a view of the holding means on a gate support in the rest position,
figure 4
according to a side view of the holding means on a gate support figure 3 ,
figure 5
a side view of the pivoted holding means and
figure 6
a side view of the swiveled-out holding means in the functional position with the pincushion extended.

In Figur 1 ist mit Bezugszeichen 1 ein Gatterturm bezeichnet. Dieser steht auf einem Fundament 25 oder auf einem Schifflibock 3 des Hinterwagens, welcher die Antriebselemente für die Schiffchen (Schiffchen nicht dargestellt) und für die Einstellung der Wagenweite enthält sowie die Antriebsmittel für den Gatterhöhenantrieb. Am Gatterturm 1 ist eine Schiene 5 befestigt, auf welcher zwei oder mehrere Wagen 7 vertikal verfahrbar gelagert sind. Die Wagen 7 tragen im Gatter 9 und am Gatter 9 befestigte Gatterstützen 11. Im oberen Bereich des Gatters 9 ist die obere Wickelwelle 13 und am unteren Ende die untere Wickelwelle 15 angeordnet und schematisch dargestellt. Zwischen den beiden Wickelwellen 13, 15 verläuft ein zwischen diesen Wickelwellen aufgespannter Stickgrund 17. Dieser ist mit einer strichpunktierten Linie dargestellt.In figure 1 reference numeral 1 denotes a gate tower. This stands on a foundation 25 or on a Schifflibock 3 of the rear carriage, which contains the drive elements for the shuttle (not shown) and for setting the width of the carriage, as well as the drive means for the gate height drive. A rail 5 is fastened to the gate tower 1, on which two or more carriages 7 are mounted so that they can be moved vertically. The carriages 7 carry gate supports 11 fastened in the gate 9 and on the gate 9. The upper winding shaft 13 is arranged in the upper region of the gate 9 and the lower winding shaft 15 is arranged at the lower end and is shown schematically. Between the two winding shafts 13, 15 runs an embroidery base 17 stretched between these winding shafts. This is shown with a dot-dash line.

Weiter sind auf den Gatterstützen 11 je zwei beabstandet befestigte Haltemittel 19 schematisch dargestellt. In der Figur 1 ist ein oberes Haltemittel 19a und ein unteres Haltemittel 19b ersichtlich. Zwischen den beiden Haltemitteln 19a und 19b sind die Schiffchenbahnen 21, auch Stöckli genannt, jedoch ohne dessen Antriebe schematisch dargestellt.Next two spaced fixed holding means 19 are shown on the gate supports 11 schematically. In the figure 1 an upper holding means 19a and a lower holding means 19b can be seen. Between the two holding means 19a and 19b, the shuttle tracks 21, also called Stöckli, are shown schematically without their drives.

Der unten liegende Bereich der Schiene 5, der nicht am Gatterturm 1 befestigt ist, ragt in einen Fundamentgraben 23 zwischen zwei Fundamenten 25 und ist an dem links liegenden Fundament 25 befestigt.The lower area of the rail 5, which is not attached to the gate tower 1, protrudes into a foundation trench 23 between two foundations 25 and is attached to the foundation 25 on the left.

In den folgenden Figuren wird in vergrössertem Massstab der Bereich A in Figur 1 dargestellt. Dieser zeigt, das erste oberhalb der Schiffchenbahn 21 angeordnete Haltemittel 19a, welches an der Gatterstütze 11 befestigt ist. Das unterhalb der Schiffchenbahn 21 liegende zweite Haltemittel 19b ist identisch mit dem erstgenannten und kopfüber an der Gatterstütze 11 befestigt (Bereich B in Figur 1).In the following figures, area A is shown on an enlarged scale in figure 1 shown. This shows the first holding means 19a which is arranged above the shuttle track 21 and which is fastened to the gate support 11. The second holding means 19b below the shuttle track 21 is identical to the first-mentioned one and is fastened upside down to the gate support 11 (area B in figure 1 ).

In der perspektivischen Darstellung in der Figur 2 ist das Haltemittel 19 detailliert dargestellt. Die Verschalung 27 des schwenkbaren Bereichs des Haltemittels 19 ist nur in strichpunktierten Linien angedeutet, so dass der mechanische Aufbau des schwenkbaren Teils detailliert und vollständig sichtbar ist. Mit einem Linearantrieb 29, beispielsweise einem Pneumatik- oder Hydraulikzylinder oder einer durch einen Elektromotor antreibbaren Spindel, kann ein Ausleger 31 um eine Schwenkachse q geschwenkt werden und zwar aus einer Ruhelage parallel zur Gatterstütze 11 (vergleiche Figuren 3 und 4 in eine lotrecht dazu liegende Arbeitslage gemäss Figuren 1, 2, 5 und 6).In the perspective view in the figure 2 the holding means 19 is shown in detail. The casing 27 of the pivotable area of the holding means 19 is only in indicated by dash-dotted lines so that the mechanical structure of the pivoting part is detailed and fully visible. With a linear drive 29, for example a pneumatic or hydraulic cylinder or a spindle that can be driven by an electric motor, a boom 31 can be pivoted about a pivot axis q from a rest position parallel to the gate support 11 (cf Figures 3 and 4 in a working position perpendicular to it according to figures 1 , 2 , 5 and 6 ).

Der Ausleger 31, der auf der Achse q gelagert ist, umfasst einen Support mit zwei parallel angeordneten Wangen 33, an welchem eine zweite Linearantriebsanordnung 35 befestigt ist, an deren Antriebsstangen 37 ein Nadelkissen 39 befestigt ist (Fig. 2 bis 4). Die Antriebsstangen 37 sind im Beispiel in den Wangen 33 längsverschiebbar gelagert. Das Nadelkissen 39, das an dem freien Ende der Antriebsstangen 37 befestigt ist, umfasst eine die Nadeln 41 tragende Halteplatte 43. Letztere liegt in Ruhestellung, vorzugsweise innerhalb des Volumens der Verschalung 27 zwischen den Wangen 33, so dass die Nadeln 41 letztere nicht überragen und gegen Beschädigung geschützt sind und keine Verletzungsgefahr für die Bedienungspersonen darstellen.The cantilever 31, which is mounted on the axis q, comprises a support with two parallel cheeks 33, on which a second linear drive arrangement 35 is attached, on the drive rods 37 of which a pin cushion 39 is attached ( Figures 2 to 4 ). In the example, the drive rods 37 are mounted in the cheeks 33 in a longitudinally displaceable manner. The pin cushion 39, fixed to the free end of the drive rods 37, comprises a support plate 43 carrying the pins 41. The latter lies at rest, preferably within the volume of the casing 27 between the cheeks 33, so that the needles 41 do not protrude the latter and are protected against damage and do not pose a risk of injury to the operators.

Anhand der Figuren 3 bis 6 wird der Aufbau des Haltemittels 19 näher beschrieben. Der erste Linearantrieb 29 ist schwenkbar auf einem Lagerbolzen 45 gelagert. Der Lagerbolzen 45 wird von einer Befestigungsplatte 47 gehalten. Die Befestigungsplatte 47 ist mit Schrauben 49 an der Gatterstütze 11 befestigt. An den Gatterstützen können eine Vielzahl von Bohrungen für die Schrauben 49 vorgesehen sein, um die Haltemittel 19 an geeigneten Stellen befestigen zu können. Aus dem ersten Linearantrieb 29 ragt oben eine Kolbenstange 51. Daran befestigt ist ein Gelenkkopf 53, der in eine Welle 55 greift. Die Welle 55 ist an deren Enden in den die Verschalung 27 bildenden Seitenwänden 27' und 27" befestigt. Mit dem ersten Linearantrieb 29 kann folglich die Verschalung 27 um die Achse q verschwenkt werden.Based on Figures 3 to 6 the structure of the holding means 19 is described in more detail. The first linear drive 29 is mounted pivotably on a bearing pin 45 . The bearing pin 45 is held by a mounting plate 47 . The mounting plate 47 is fixed to the gate post 11 with screws 49 . A large number of bores for the screws 49 can be provided on the gate supports in order to be able to fasten the holding means 19 at suitable points. A piston rod 51 protrudes from the top of the first linear drive 29. A joint head 53, which engages in a shaft 55, is fastened to it. The shaft 55 is fastened at its ends in the side walls 27' and 27'' forming the casing 27. The casing 27 can consequently be pivoted about the axis q with the first linear drive 29.

Auf der Achse q sitzt ein Bolzen 57 an dessen beiden Enden je eine beispielsweise rautenförmige Platte 59 drehfest befestigt ist. Die Platte 59 ist an deren Enden durch Schrauben 61 mit den Seitenwänden 27' und 27" verschraubt. Das hintere Ende des Bolzens 57 ist mit der Befestigungsplatte 47 verbunden.A bolt 57 is seated on the axis q, at both ends of which a plate 59, for example in the shape of a rhombus, is fastened in a rotationally fixed manner. The plate 59 is screwed at its ends to the side walls 27' and 27'' by screws 61. The rear end of the bolt 57 is connected to the fastening plate 47.

Die beiden Linearantriebe 29, 35 sind durch Schläuche bzw. Leitungen mit den jeweilig zugeordneten Druckluftquellen bzw. elektrischen Schaltern verbunden. Letztere sind nicht dargestellt.The two linear drives 29, 35 are connected by hoses or lines to the associated compressed air sources or electrical switches. The latter are not shown.

Nachfolgend wird nun die Funktionsweise der Vorrichtung bzw. das Verfahren zur Verhinderung von ungenau gesetzten Stichen beschrieben.The functioning of the device and the method for preventing imprecisely placed stitches will now be described below.

Ausgehend von einem in herkömmlicher Weise auf den Wickelwellen 13, 15 aufgespannten und auch seitlich in horizontaler Richtung von Spannstäben (Spannstäbe nicht gezeigt) in gespanntem Zustand gehaltenen Stickgrund 17 und an den Gatterstützen 11 in Ruhestellung (Figuren 3 und 4) liegenden Haltemitteln 9 wird das Verfahren nachfolgend beschrieben. Mit dem ersten Linearantrieb 29 wird das in der Verschalung 27 angeordnete Nadelkissen 39 um einen Winkel von 90° geschwenkt. Der 90° Winkel wird vorzugsweise durch einen Endanschlag 63 an der Befestigungsplatte 47 exakt festgelegt. Anschliessend wird das Nadelkissen 39 mit den Nadeln 41 auf der Halteplatte 43 in Richtung Z lotrecht an den Stickgrund 17 herangeschoben. Dabei durchdringen die feinen Nadeln 41 den Stickgrund 17 und können diesen, falls erwünscht, zusätzlich in Z-Richtung leicht, beispielsweise um einige Millimeter, nach rechts in Z-Richtung drücken. Dadurch wird sichergestellt, dass sich der Stickgrund 17 während des Stickens nicht durch allenfalls vorhandene, in Z-Richtung verlaufende Schwingungen des Gatters 9 von den Nadeln 41 löst.Starting from an embroidery base 17 stretched in a conventional manner on the winding shafts 13, 15 and also held in a stretched state laterally in the horizontal direction by stretching rods (stretching rods not shown) and on the gate supports 11 in the rest position ( Figures 3 and 4 ) Lying holding means 9, the method is described below. The needle cushion 39 arranged in the casing 27 is pivoted by an angle of 90° with the first linear drive 29 . The 90° angle is preferably precisely defined by an end stop 63 on the mounting plate 47 . Then the pincushion 39 with the needles 41 on the holding plate 43 is pushed in the Z direction perpendicularly to the embroidery base 17 . The fine needles 41 penetrate the embroidery base 17 and, if desired, can also press it slightly in the Z direction, for example by a few millimeters, to the right in the Z direction. This ensures that the embroidery base 17 does not become detached from the needles 41 during the embroidering as a result of any vibrations of the creel 9 running in the Z direction.

Während des Stickvorgangs wird in herkömmlicher Weise das Gatter 9 mit den daran fest angeordnet verbundenen Gatterstützen 11 in X- und/oder Y-Richtung, d.h. horizontal und vertikal, bewegt, um eine entsprechend programmierte Stickerei auf den Stickgrund 17 bzw. deren Stiche und der Länge zwischen den Stichen zu ermöglichen. Da nun das Haltemittel 19 mit dem Nadelkissen 39 exakt dieselbe Bewegung ausführt wie das Gatter 9, kann sich der Stickgrund 17 trotz hohen Beschleunigungen und Verzögerungen nicht mehr stark relativ zum Gatter 9 bewegen. Der Stickgrund 17 bleibt dadurch stets exakt zum Gatter 9 positioniert gehalten.During the embroidering process, the gate 9 with the gate supports 11 fixedly arranged thereon is moved in the X and/or Y direction, i.e. horizontally and vertically, in a conventional manner in order to carry out a correspondingly programmed embroidery on the embroidery base 17 or its stitches and the to allow length between stitches. Since the holding means 19 with the pin cushion 39 now executes exactly the same movement as the gate 9, the embroidery base 17 can no longer move strongly relative to the gate 9 despite high accelerations and decelerations. As a result, the embroidery base 17 is always kept exactly positioned in relation to the gate 9 .

Da stets oberhalb und unterhalb des Stickbereichs an den Gatterstützen je ein Haltemittel 19 angeordnet ist, wird gewährleistet, dass im Stickbereich, hier ein über die gesamte Länge der Stickmaschine verlaufender Bereich beruhigt werden kann. Beim Wechseln vom oberen zum unteren Stickbereich müssen also nur die unteren Nadelkissen 39 aus dem Stickgrund 17 zurückgezogen werden und das Gatter 9 um die Breite des nachfolgend zu bestickenden Bereichs verschoben werden. Danach fahren die Nadeln 41 wieder in den Stickgrund 17 ein und halten diesen während der weiteren Bearbeitung durch die Stickmaschine positioniert fest.Since a holding means 19 is always arranged above and below the embroidery area on the creel supports, it is ensured that in the embroidery area, here an area running over the entire length of the embroidery machine, can be stabilized. When changing from the upper to the lower embroidery area, only the lower pin cushions 39 have to be withdrawn from the embroidery base 17 and the gate 9 has to be shifted by the width of the area to be subsequently embroidered. The needles 41 then move back into the embroidery base 17 and hold it in position during further processing by the embroidery machine.

Alternativ zu Nadelkissen 39 können als Halteelemente auch auf der Halteplatte 43 Gummiplatten, Noppen, Hakenbänder, Schlingenbänder, Moosgummiplatten oder sonstige Kissen befestigt sein, welche insbesondere bei sehr fein ausgebildeten Stickgrundmaterialien eine Verletzung des Stickgrunds 17 vermeiden, aber dennoch halten.As an alternative to pincushions 39, rubber plates, nubs, hook tapes, loop tapes, foam rubber plates or other cushions can also be fastened as retaining elements on the retaining plate 43, which prevent damage to the embroidery base 17, especially with very finely designed embroidery base materials, but still hold it.

Denkbar wäre auch eine geeignete Teleskopschiene oder ein Teleskoprohr, an dessen Ende die Nadelkissen 39 befestigt werden. Damit würde die Schwenkbewegung entfallen.A suitable telescopic rail or a telescopic tube would also be conceivable, at the end of which the pin cushions 39 are attached. This would eliminate the pivoting movement.

Claims (9)

  1. A method for preventing stitches placed imprecisely during the embroidery process, on an embroidery ground (17) held in a tensioned manner between two winding shafts (13,15) and two lateral tensioning rods on a shuttle embroidery machine having a creel (9),
    characterized in that
    the embroidery ground (17) is secured above and/or below the embroidery area in a positionally correct manner relative to the creel (9) at multiple points in the X, Y and Z direction between the winding shafts (13,15) and the tensioning rods with holding means (19) during embroidery.
  2. The method according to Claim 1, characterized in that the holding means (19) penetrate the embroidery ground (17) during the embroidery process or secure it in position by adhesion or sliding friction.
  3. The method according to any one of Claims 1 or 2, characterized in that the embroidery ground (17) is deflected in the Z direction perpendicular to the embroidery ground (17) with the holding means (19).
  4. A device for carrying out the method according to Claim 1, comprising a shuttle embroidery machine having a creel (9) and having creel supports (11) arranged in the creel (9), two winding shafts (13, 15) and two lateral tensioning rods for holding an embroidery ground (17) in a tensioned and secure manner,
    characterized in that
    holding means (19) which can be swung out or extended are arranged on the creel supports (11), with which holding means the embroidery ground (17) can be undisplaceably positioned relative to the creel (9) during embroidery.
  5. The device according to Claim 4, characterized in that the holding means (19) are formed to be movable towards the embroidery ground (17) and away from the latter.
  6. The device according to Claim 5, characterized in that the holding means (19) are pivotably articulated on the creel supports (11).
  7. The device according to any one of Claims 4 to 6, characterized in that contact elements for contacting the embroidery ground (17) are formed on the holding means (19) .
  8. The device according to Claim 7, characterized in that needles (41), Velcro® or foam pads or a punch with a surface having a high coefficient of friction is/are utilized as contact elements.
  9. The device according to any one of Claims 4 to 8, characterized in that the holding means (19) is positioned in the Z direction by a linear drive (35).
EP18209074.6A 2018-02-05 2018-11-29 Method and device for preventing stitches placed imprecisely on the stitch base of a sewing machine Active EP3521498B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00127/18A CH714623A1 (en) 2018-02-05 2018-02-05 Method and device for preventing inaccurately placed stitches on the embroidery base of an embroidery machine.

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EP3521498A1 EP3521498A1 (en) 2019-08-07
EP3521498B1 true EP3521498B1 (en) 2022-09-14

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EP (1) EP3521498B1 (en)
KR (1) KR20190095090A (en)
CH (1) CH714623A1 (en)
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Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH48455A (en) * 1909-08-14 1910-10-17 Carl Aberer Innovation on shuttle embroidery machines
JPS61103484A (en) * 1984-10-25 1986-05-21 松下　良一 Cloth presser of quilting for cushion sofa
EP0919657B1 (en) * 1997-10-27 2003-04-02 Franz Lässer AG Embroidering frame with a web stretching device
US7143705B2 (en) * 2002-03-06 2006-12-05 L & P Property Management Company Multiple horizontal needle quilting machine and method
DE102008035434B4 (en) * 2008-07-29 2015-02-05 Saurer Ag Fabric presser of an embroidery machine
CH702068A1 (en) * 2009-10-26 2011-04-29 Laesser Ag Multi-head multi-needle embroidery machine and stenter it.
CH703065A1 (en) * 2010-04-23 2011-10-31 Laesser Ag Embroidery machine and method for operating an embroidery machine.
JP6143327B2 (en) * 2013-02-01 2017-06-07 蛇の目ミシン工業株式会社 Embroidery cloth presser
CH712727A1 (en) * 2016-07-21 2018-01-31 Lässer Ag Embroidery machine, in particular shuttle embroidery machine.
CN206385332U (en) * 2016-11-08 2017-08-08 浙江百翔科技有限公司 Integrated glove knitting machine

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CH714623A1 (en) 2019-08-15
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TW201934835A (en) 2019-09-01

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