EP3215659B1 - Doffer gripper having a split housing - Google Patents

Doffer gripper having a split housing Download PDF

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Publication number
EP3215659B1
EP3215659B1 EP15791038.1A EP15791038A EP3215659B1 EP 3215659 B1 EP3215659 B1 EP 3215659B1 EP 15791038 A EP15791038 A EP 15791038A EP 3215659 B1 EP3215659 B1 EP 3215659B1
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EP
European Patent Office
Prior art keywords
holding element
gripper
holding
air duct
fastening
Prior art date
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Active
Application number
EP15791038.1A
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German (de)
French (fr)
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EP3215659A1 (en
Inventor
Robert Nägeli
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP3215659A1 publication Critical patent/EP3215659A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H9/00—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
    • D01H9/001—Bobbin-taking arrangements
    • D01H9/003—Graspers operating under the action of a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/02—Arrangements for removing spent cores or receptacles and replacing by supply packages at paying-out stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/06—Supplying cores, receptacles, or packages to, or transporting from, winding or depositing stations
    • B65H67/069—Removing or fixing bobbins or cores from or on the vertical peg of trays, pallets or the pegs of a belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a gripper for gripping a bobbin or bobbin tube according to the independent claim, a doffer device and a spinning machine.
  • the spinning machines In a large number of spinning machines, in particular ring spinning machines, a large number of already wound bobbins or cops are removed together at the spinning positions of the spinning machine during a bobbin change process and replaced by empty bobbin tubes.
  • the spinning machines have a doffer device with a doffer bar, which is arranged on the spinning machine so as to be movable, for example via a scissor mechanism.
  • a plurality of grippers or doffer grippers are in turn arranged on the doffer bar in order to be able to jointly grip and remove or attach the bobbins or the empty bobbin tubes.
  • the individual grippers can preferably be operated pneumatically and contain a clamping element in the form of a membrane that can be acted upon by compressed air, which is brought over the coil or bobbin case and then grips the bobbin or bobbin case by introducing compressed air.
  • a clamping element in the form of a membrane that can be acted upon by compressed air, which is brought over the coil or bobbin case and then grips the bobbin or bobbin case by introducing compressed air.
  • ducts supplying compressed air are arranged in the doffer beam, from which the compressed air is conducted via feed lines to the individual diaphragms of the grippers.
  • the CN 2,873,813 Y describes a correspondingly designed gripper.
  • the gripper has a cylindrical holding element for receiving a bobbin or bobbin tube.
  • a clamping element in the form of a rubber membrane which can be adjusted by a pneumatic device, is arranged on the inner wall of the holding element. With the membrane it is possible to grasp the end region of the coil or coil sleeve inserted into the interior of the holding element from the outside.
  • the membrane is arranged over two closure caps, which are each arranged on the bottom and top of the holding element are fixed in the direction of a longitudinal axis on the holding element. The two closure caps are clipped onto the holding element via a snap connection.
  • the gripper comprises a fastening element for fastening to a doffer beam.
  • the fastening element is firmly connected to the holding element and contains an air channel for the supply of compressed air to the membrane.
  • the fastening element has a hook on its upper side and an elastic retaining tab on its lower side.
  • the gripper is fixed to a receptacle via the hook and in a locking groove on the doffer bar via the elastic retaining tab.
  • a gripper with a similar structure is shown in FIG EP 0 303 877 A1 shown.
  • the fastening element of the gripper has an elastic retaining tab on its underside and on its upper side.
  • the gripper can be disengaged and detachably attached in two parallel locking grooves on the doffer bar via the two elastic retaining tabs.
  • the locking grooves enable a plurality of individual grippers to be attached along the doffer beam.
  • FR1364639 , DE4128216 , CN200992611 also disclose grippers of a textile machine for gripping a bobbin or bobbin tube.
  • Fig. 1 shows a gripper 1 belonging to the prior art.
  • the gripper 1 is made of plastic and has a cylindrical holding element 2 for a bobbin or bobbin case 3 ( Fig. 2 ).
  • the cylindrical holding element 2 has an inner wall 4 on which a pneumatically adjustable clamping element 5 in the form of a membrane made of rubber is arranged. With the membrane 5 it is possible to detect the end region of the coil or coil sleeve 3 introduced into the interior of the holding element 2 from the outside. The adjustment of the membrane 5 takes place in the direction of the double arrow 6 via a pneumatic device.
  • the membrane 5 is fixed on the holding element 2 in the direction of a longitudinal axis 10 via two closure caps 7 or clamps, which are each arranged on the bottom 8 and top 9 of the holding element 2.
  • the two closure caps 7 are clipped onto the holding element 2 via a snap connection.
  • the gripper 1 comprises a fastening element 11.
  • the fastening element 11 is firmly connected to the holding element 2 and contains an air duct 12 for supplying compressed air to the membrane 5.
  • the air duct 12 is connected to a compressed air line which extends longitudinally on the doffer bar .
  • the air duct 12 is sealed off from the doffer bar by a first sealing element 13 arranged on the fastening element 11.
  • the fastening element 11 also has a second sealing element 14 which seals the gripper 1 against a compressed air signal line which also extends in the longitudinal direction on the doffer beam.
  • Two elastic retaining tabs 15 are arranged on the fastening element 11.
  • the elastic retaining tabs 15 are connected with their first end 16 to the fastening element 11. With its second free end 17, the gripper 1 can be disengaged and releasably attached to the doffer bar.
  • the holding or clamping effect of the holding tabs 15 is increased or supported by a steel spring 18 embedded in the fastening element 11 below the holding tabs 15.
  • the membrane 5 When changing a bobbin or bobbin case 3, the membrane 5 is acted upon by compressed air via the air duct 12. The membrane 5 is thereby detached from the inner wall 4 of the holding element 2 and grasps the coil or bobbin case 3 at its outer end area. The bobbin or bobbin tube 3 can then be transferred to a transport device or spindle (not shown). In order to release the bobbin or bobbin case 3 in the holding element 2 again, the diaphragm 5 is relieved by removing the compressed air. Due to the alternating loading and unloading of the diaphragm 5 in the holding element 2, and the friction of the diaphragm 5 on the coil or bobbin case 3, the diaphragm 5 is worn out after a certain period of operation.
  • the wear is shown by the fact that the membrane 5 is porous and has leaks. As a result, a safe exchange of the bobbin or bobbin case 3 is no longer guaranteed. It is therefore necessary to replace the worn membrane 5 with a new membrane 5 after a certain period of operation.
  • a major disadvantage of the in Fig.1 and Fig.2 shown gripper 1 consists in the fact that the replacement of a worn membrane 5 for a new membrane 5 designed as very elaborate.
  • the gripper 1 In order to replace a membrane 5, the gripper 1 must first be removed from the doffer bar by the operating personnel. For this purpose, the elastic retaining tabs 15 are notched. The worn membrane 5 can then be separated from the holding element 2 by loosening the closure caps 7 and exchanged for a new membrane 5. The new membrane 5 is then fixed again in the axial direction on the holding element 2 by the closure caps 7 and the gripper 1 is clipped onto the doffer bar via the elastic holding tabs 15.
  • the replacement of a worn membrane 5 is therefore very complex, since the entire gripper 1 has to be removed from the doffer beam.
  • An exchange of the membrane 5 is associated with long downtimes of the spinning machine.
  • the frequent assembly and dismantling of the gripper 1 on the doffer beam leads to unnecessary wear of the elastic retaining tabs 15. As a result, a sufficient clamping effect of the elastic retaining tabs 15 on the doffer beam is no longer ensured.
  • the invention now has the task of eliminating this disadvantage of the known gripper.
  • the holding element is held on the fastening element via a securing element.
  • the retaining element is secured to the fastening element transversely to its longitudinal axis via the securing element.
  • the fastening element and the holding element are separate from one another, ie the fastening element and the holding element represent two separate components.
  • the gripper no longer has to be removed from the doffer bar to replace the clamping element. Rather, it is possible to leave the gripper on the doffer beam and to remove the holding element with the clamping element from the fastening element by loosening the securing element.
  • the worn clamping element can then simply be exchanged for a new clamping element.
  • the downtime of the spinning machine while a clamping element is being replaced is kept short.
  • a prevents unnecessary wear of the elastic retaining tabs on the fastening element. A sufficient clamping effect of the elastic retaining tabs on the doffer beam is guaranteed.
  • the securing element partially surrounds the outer wall of the holding element or rests partially on the outer wall of the holding element. This ensures that the holding element is adequately held or positioned on the fastening element.
  • the securing element represents a part of the housing of the gripper.
  • the securing element advantageously encloses the outer wall of the holding element between 180 ° -270 °.
  • the securing element is connected to the fastening element via a snap connection.
  • the snap connection is designed in such a way that the fastening element has elevations and the securing element has depressions which enclose the elevations.
  • the securing element it is also possible for the securing element to have elevations and the fastening element to have depressions which enclose the elevations.
  • the clamping element is fixed over a first portion of its circumference via the fastening element and over a second portion of its circumference via the securing element at least at one of its ends in the direction of the longitudinal axis on the holding element. It is also advantageous if the clamping element or the membrane at its two ends, ie at the lower and upper end of the holding element, over a first portion of its circumference over the fastening element and over a second portion of its circumference over the securing element in the direction of the longitudinal axis of the holding element is fixed on the holding element. In contrast to the prior art, this means that the two closure caps for axially fixing the clamping element on the holding element are omitted.
  • a sealing ring is arranged at least at one end of the holding element between the clamping element and the fastening element.
  • the sealing ring is arranged either at the lower or at the upper end of the holding element or at the lower and the upper end of the holding element.
  • the sealing ring rests with a first end face on the fastening element and presses the clamping element against the holding element with a second end face. It is also possible for the outer circumference of the sealing ring to lie against the fastening element and for its inner circumference to press the clamping element against the holding element.
  • elevations are arranged on the inner wall of the holding element, which elevations extend over a length of the holding element.
  • the length of the holding element represents the dimensions of the holding element in its longitudinal direction.
  • the rounded elevations ensure that the clamping element does not adhere to the inner wall of the holding element. A safe exchange of the coil or the bobbin case is guaranteed.
  • the elevations are advantageously designed to be semicircular.
  • At least one rib is arranged on the outer wall of the holding element over at least part of the circumference of the holding element.
  • the rib serves as a support surface for the securing element and ensures that the holding element is sufficiently held or positioned on the fastening element via the securing element.
  • the rib is advantageously arranged to run in the circumferential direction on the holding element.
  • the rib encloses the holding element completely or part of the circumference of the holding element, preferably between 90 ° -270 °.
  • the rib can also be arranged on the holding element running in the longitudinal direction. In this case, several ribs spaced apart from one another can be arranged on the holding element.
  • the air duct is connected in one piece to the holding element and the fastening element has a receptacle for the air duct.
  • the term "one-piece" means that the air duct is firmly integrated into the holding element, i.e. the air duct cannot be separated from the holding element.
  • the retaining element is loosely connected to the receptacle of the fastening element via the air duct, i.e. the retaining element can be inserted into the receptacle via the air duct.
  • the receptacle has a slightly smaller dimension than the air duct. The receptacle extends completely or partially over the length of the air duct.
  • the air duct has at least one annular shoulder on an outer surface which forms a sealing point between the air duct and the fastening element.
  • the shoulder extends over a length of 2-10 mm of the air duct and is made of an elastic plastic.
  • the shoulder is integrally connected to the air duct. If compressed air is applied to the clamping element, the air duct expands in the radial direction in the receptacle. The shoulder is pressed against the fastening element and seals the air duct from the receptacle.
  • an additional sealing element is arranged in the receptacle between the fastening element and the air duct.
  • the sealing element seals the air duct from the fastening element and the doffer beam.
  • the sealing element is advantageously designed as a sleeve made of rubber and extends partially over the length of the air duct.
  • the sealing element has two spaced-apart ribs running in the circumferential direction on its outer surface.
  • Fig. 3 shows a perspective view of a gripper 1 according to the invention.
  • the gripper 1 is made of plastic and has a cylindrical holding element 2 for a bobbin or bobbin case 3 ( Fig. 4 ).
  • the holding element 2 has an inner wall 4 on which a pneumatically adjustable clamping element 5 in the form of a membrane made of rubber is arranged. With the membrane 5 it is possible to detect the end region of the coil or coil sleeve 3 introduced into the interior of the holding element 2 from the outside. The adjustment of the membrane 5 takes place in the direction of the double arrow 6 via a pneumatic device.
  • the gripper 1 comprises a fastening element 11.
  • Two elastic retaining tabs 15 are arranged on the fastening element 11, and their first end 16 is connected to the fastening element 11. With its second free end 17, the gripper 1 can be disengaged and releasably attached to the doffer beam.
  • the holding or clamping effect of the holding tabs 15 is increased or supported by a steel spring 18 embedded in the fastening element 11 below the holding tabs 15.
  • the holding element 2 is held on the fastening element 11 via a securing element 19.
  • the security element 19 encloses 180 ° of the outer wall 20 of the holding element 2, or rests over 180 ° on the outer wall 20 of the holding element 2 ( Fig. 5 ).
  • the securing element 19 thus represents a part of the housing of the gripper 1 in addition to the fastening element 11.
  • the retaining element 2 is secured to the fastening element 11 transversely to its longitudinal axis 10 via the securing element 19.
  • the rib 21 serves as a support surface for the securing element 19 and ensures that the holding element 2 is sufficiently held or positioned on the fastening element 11 via the securing element 19. How out Fig. 5 is apparent, the securing element 19 is detachably connected to the fastening element 11 via a snap connection.
  • the snap connection is designed in such a way that the fastening element 11 has elevations 22 and the securing element 19 has tabs 23 with recesses 24 which enclose the elevations 22 or in which the elevations 22 snap.
  • the membrane 5 is both at a lower end 8 and at an upper end 9 of the holding element 2 over 180 ° of the circumference of the membrane 5 over the fastening element 11 and over 180 ° of the circumference of the membrane 5 over the securing element 19 in the axial direction on the holding element 2 fixed.
  • the two closure caps 7 or clamps for axially fixing the membrane 5 on the holding element 2 are omitted.
  • a sealing ring 25 is arranged.
  • the sealing ring 25 rests with a first end face 26 on the fastening element 11 and on the securing element 19 and with a second end face 27 presses the membrane 5 against the lower end 8 or the upper end 9 of the holding element 2.
  • the holding element 2 is on its inner wall 4 provided with semicircular elevations 28, which extend over the length of the holding element 2 ( Fig. 5 ).
  • the holding element 2 is also provided with an air duct 12.
  • the air duct 12 is firmly connected to the outer wall 20 of the holding element 2, ie the holding element 2 and the air duct 12 are integrally formed.
  • the air duct 12 has an annular shoulder 31 on its outer surface 30.
  • the shoulder 31 extends over a length 32 of 8 mm of the air duct 12 and is made of an elastic plastic.
  • the shoulder 31 is connected in one piece to the air duct 12.
  • the fastening element 11 has a receptacle 33 for the air duct 12.
  • the receptacle 33 is cylindrical and extends over the length of the air duct 12.
  • the holding element 2 is loosely connected to the fastening element 11 via the shoulder 31 of the air duct 12.
  • the air duct 12 expands in the radial direction in the receptacle 33. As a result, the shoulder 31 is pressed against the fastening element 11 and seals the air duct 12 from the fastening element 11.
  • An additional sealing element 13 is arranged between the fastening element 11 and the air duct 12.
  • the air duct 12 is connected via the sealing element 13 to a compressed air line which extends in the longitudinal direction on the doffer beam.
  • the sealing element 13 is designed as a sleeve made of rubber.
  • the sealing element 13 rests with a first end 35 on the annular shoulder 31 of the air duct 12. With a second end 36, the sealing element 13 seals the air duct 12 from the compressed air line on the doffer beam.
  • the sealing element 13 has two spaced apart ribs 37 on its circumference.
  • a further sealing element 14 is also arranged on the fastening element 11, which seals the gripper 1 against a compressed air signal line which also extends in the longitudinal direction on the doffer beam.
  • the sealing element 14 also has two spaced apart ribs 37 on its circumference for better sealing.
  • the gripper 1 according to the invention no longer has to be removed as a whole from the doffer beam in order to replace a membrane 5. Rather, it is possible to leave the gripper 1 on the doffer beam and to remove the holding element 2 from the fastening element 11. For this purpose, the securing element 19 is released from the fastening element 11. The holding element 2 can then be separated from the fastening element 11 and the worn membrane 5 can be exchanged for a new membrane 5. The downtime of the spinning machine during the replacement of a membrane 5 is thereby kept low. In addition, unnecessary wear of the elastic retaining tabs 15 on the fastening element 11 is prevented, since only the retaining element 2 has to be removed from the gripper 1. A sufficient clamping effect of the elastic retaining tabs 15 on the doffer beam is guaranteed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Description

Technisches GebietTechnical area

Die Erfindung bezieht sich auf einen Greifer zum Greifen einer Spule oder Spulenhülse entsprechend des unabhängigen Anspruchs, eine Doffervorrichtung und ein Spinnmaschine .The invention relates to a gripper for gripping a bobbin or bobbin tube according to the independent claim, a doffer device and a spinning machine.

Stand der TechnikState of the art

Bei einer Vielzahl von Spinnmaschinen, insbesondere bei Ringspinnmaschinen, werden bei einem Spulenwechselvorgang eine Vielzahl bereits fertig bewickelter Spulen bzw. Kopse gemeinsam an den Spinnstellen der Spinnmaschine abgenommen und durch leere Spulenhülsen ersetzt. Die Spinnmaschinen weisen hierzu eine Doffervorrichtung mit einem Dofferbalken auf, welcher beispielsweise über einen Scherenmechanismus beweglich an der Spinnmaschine angeordnet ist. An dem Dofferbalken ist wiederum eine Vielzahl von Greifern bzw. Doffergreifern angeordnet, um die Spulen bzw. die leeren Spulenhülsen gemeinsam greifen und abnehmen bzw. aufstecken zu können. Die einzelnen Greifer sind bevorzugt pneumatisch betätigbar und beinhalten ein druckluftbeaufschlagbares Klemmelement in Form einer Membran, welche über die Spule bzw. Spulenhülse gebracht wird und anschliessend die Spule bzw. Spulenhülse durch Einbringen von Druckluft greift. Zum Beaufschlagen der einzelnen Greifer mit Druckluft sind druckluftzuführende Kanäle im Dofferbalken angeordnet, von welchem die Druckluft über Zuführungen jeweils zu den einzelnen Membranen der Greifer geleitet wird.In a large number of spinning machines, in particular ring spinning machines, a large number of already wound bobbins or cops are removed together at the spinning positions of the spinning machine during a bobbin change process and replaced by empty bobbin tubes. For this purpose, the spinning machines have a doffer device with a doffer bar, which is arranged on the spinning machine so as to be movable, for example via a scissor mechanism. A plurality of grippers or doffer grippers are in turn arranged on the doffer bar in order to be able to jointly grip and remove or attach the bobbins or the empty bobbin tubes. The individual grippers can preferably be operated pneumatically and contain a clamping element in the form of a membrane that can be acted upon by compressed air, which is brought over the coil or bobbin case and then grips the bobbin or bobbin case by introducing compressed air. In order to apply compressed air to the individual grippers, ducts supplying compressed air are arranged in the doffer beam, from which the compressed air is conducted via feed lines to the individual diaphragms of the grippers.

Die CN 2 873 813 Y beschreibt einen entsprechend ausgebildeten Greifer. Der Greifer besitzt ein zylindrisches Halteelement zur Aufnahme einer Spule oder Spulenhülse. An der Innenwandung des Halteelements ist ein Klemmelement in Form einer Gummimembran angeordnet, das über eine pneumatische Einrichtung verstellbar ist. Mit der Membran ist es möglich, den Endbereich der in das Innere des Halteelements eingeführten Spule oder Spulenhülse von Aussen zu erfassen. Die Membran ist über zwei Verschlusskappen, die jeweils an der Unterseite und Oberseite des Halteelements angeordnet sind, in Richtung einer Längsachse am Halteelement fixiert. Die beiden Verschlusskappen sind dabei über eine Schnappverbindung an das Halteelement angeklippst. Zur Befestigung an einem Dofferbalken umfasst der Greifer ein Befestigungselement. Das Befestigungselement ist mit dem Halteelement fest verbunden und enthält einen Luftkanal für die Druckluftzufuhr zur Membran. Das Befestigungselement weist an seiner Oberseite einen Haken und an seiner Unterseite eine elastische Haltelasche auf. Der Greifer wird über den Haken an einer Aufnahme und über die elastische Haltelasche in einer Rastnut am Dofferbalken fixiert. Ein vom Aufbau ähnlicher Greifer ist in der EP 0 303 877 A1 dargestellt. Im Unterschied zum oben beschriebenen Greifer weist das Befestigungselement des Greifers an seiner Unterseite und an seiner Oberseite eine elastische Haltelasche auf. Über die beiden elastischen Haltelaschen ist der Greifer ausrastbar und lösbar in zwei parallelen Rastnuten am Dofferbalken anbringbar. Die Rastnuten ermöglichen, eine Mehrzahl von individuellen Greifern entlang dem Dofferbalken zu befestigen.The CN 2,873,813 Y describes a correspondingly designed gripper. The gripper has a cylindrical holding element for receiving a bobbin or bobbin tube. A clamping element in the form of a rubber membrane, which can be adjusted by a pneumatic device, is arranged on the inner wall of the holding element. With the membrane it is possible to grasp the end region of the coil or coil sleeve inserted into the interior of the holding element from the outside. The membrane is arranged over two closure caps, which are each arranged on the bottom and top of the holding element are fixed in the direction of a longitudinal axis on the holding element. The two closure caps are clipped onto the holding element via a snap connection. The gripper comprises a fastening element for fastening to a doffer beam. The fastening element is firmly connected to the holding element and contains an air channel for the supply of compressed air to the membrane. The fastening element has a hook on its upper side and an elastic retaining tab on its lower side. The gripper is fixed to a receptacle via the hook and in a locking groove on the doffer bar via the elastic retaining tab. A gripper with a similar structure is shown in FIG EP 0 303 877 A1 shown. In contrast to the gripper described above, the fastening element of the gripper has an elastic retaining tab on its underside and on its upper side. The gripper can be disengaged and detachably attached in two parallel locking grooves on the doffer bar via the two elastic retaining tabs. The locking grooves enable a plurality of individual grippers to be attached along the doffer beam.

FR1364639 , DE4128216 , CN200992611 offenbaren ebenfalls Greifer einer Textilmaschine zum Greifen einer Spule oder Spulenhülse. FR1364639 , DE4128216 , CN200992611 also disclose grippers of a textile machine for gripping a bobbin or bobbin tube.

Fig. 1 zeigt einen zum Stand der Technik gehörenden Greifer 1. Der Greifer 1 ist aus Kunststoff hergestellt und besitzt ein zylindrisches Halteelement 2 für eine Spule oder Spulenhülse 3 (Fig.2). Das zylindrische Halteelement 2 weist eine Innenwandung 4 auf, an welcher ein pneumatisch verstellbares Klemmelement 5 in Form einer Membran aus Gummi angeordnet ist. Mit der Membran 5 ist es möglich, den Endbereich der in das Innere des Halteelements 2 eingeführten Spule oder Spulenhülse 3 von aussen zu erfassen. Die Verstellung der Membran 5 erfolgt in Richtung des Doppelpfeiles 6 über eine pneumatische Einrichtung. Die Membran 5 ist über zwei Verschlusskappen 7 bzw. Klemmen, die jeweils an der Unterseite 8 und Oberseite 9 des Halteelements 2 angeordnet sind, in Richtung einer Längsachse 10 am Halteelement 2 fixiert. Die beiden Verschlusskappen 7 sind dabei an das Halteelement 2 über eine Schnappverbindung angeklippst. Fig. 1 shows a gripper 1 belonging to the prior art. The gripper 1 is made of plastic and has a cylindrical holding element 2 for a bobbin or bobbin case 3 ( Fig. 2 ). The cylindrical holding element 2 has an inner wall 4 on which a pneumatically adjustable clamping element 5 in the form of a membrane made of rubber is arranged. With the membrane 5 it is possible to detect the end region of the coil or coil sleeve 3 introduced into the interior of the holding element 2 from the outside. The adjustment of the membrane 5 takes place in the direction of the double arrow 6 via a pneumatic device. The membrane 5 is fixed on the holding element 2 in the direction of a longitudinal axis 10 via two closure caps 7 or clamps, which are each arranged on the bottom 8 and top 9 of the holding element 2. The two closure caps 7 are clipped onto the holding element 2 via a snap connection.

Zur Befestigung des Greifers 1 an einem in Fig.1 und Fig.2 nicht dargestellten Dofferbalken, umfasst der Greifer 1 ein Befestigungselement 11. Das Befestigungselement 11 ist mit dem Halteelement 2 fest verbunden und enthält einen Luftkanal 12 für die Druckluftzufuhr der Membran 5. Der Luftkanal 12 ist mit einer Druckluftleitung verbunden, welche sich in Längsrichtung am Dofferbalken erstreckt. Der Luftkanal 12 ist gegenüber dem Dofferbalken über ein erstes am Befestigungselement 11 angeordnetes Dichtungselement 13 abgedichtet. Das Befestigungselement 11 weist zudem ein zweites Dichtungselement 14 auf, das den Greifer 1 gegenüber einer Druckluftsignalleitung abdichtet, die sich ebenfalls in Längsrichtung am Dofferbalken erstreckt. Am Befestigungselement 11 sind zwei elastische Haltelaschen 15 angeordnet. Die elastischen Haltelaschen 15 sind mit ihrem ersten Ende 16 mit dem Befestigungselement 11 verbunden. Mit ihrem zweiten freien Ende 17 ist der Greifer 1 ausrastbar und lösbar an dem Dofferbalken anbringbar. Die Halte- bzw. Klemmwirkung der Haltelaschen 15 wird von einer unterhalb der Haltelaschen 15 im Befestigungselement 11 eingebetteten Stahlfeder 18 erhöht bzw. unterstützt.To attach the gripper 1 to an in Fig.1 and Fig.2 Doffer bar, not shown, the gripper 1 comprises a fastening element 11. The fastening element 11 is firmly connected to the holding element 2 and contains an air duct 12 for supplying compressed air to the membrane 5. The air duct 12 is connected to a compressed air line which extends longitudinally on the doffer bar . The air duct 12 is sealed off from the doffer bar by a first sealing element 13 arranged on the fastening element 11. The fastening element 11 also has a second sealing element 14 which seals the gripper 1 against a compressed air signal line which also extends in the longitudinal direction on the doffer beam. Two elastic retaining tabs 15 are arranged on the fastening element 11. The elastic retaining tabs 15 are connected with their first end 16 to the fastening element 11. With its second free end 17, the gripper 1 can be disengaged and releasably attached to the doffer bar. The holding or clamping effect of the holding tabs 15 is increased or supported by a steel spring 18 embedded in the fastening element 11 below the holding tabs 15.

Beim Wechseln einer Spule oder Spulenhülse 3 wird die Membran 5 über den Luftkanal 12 mit Druckluft beaufschlagt. Die Membran 5 löst sich dadurch von der Innenwandung 4 des Halteelements 2 und erfasst die Spule oder Spulenhülse 3 an ihrem äusseren Endbereich. Die Spule oder Spulenhülse 3 kann dann auf eine nicht dargestellte Transportvorrichtung bzw. Spindel überführt werden. Um die Spule oder Spulenhülse 3 im Halteelement 2 wieder freizugeben, wird die Membran 5 durch Wegnahme der Druckluft entlastet. Aufgrund der abwechselnden Belastung und Entlastung der Membran 5 im Halteelement 2, und der Reibung der Membran 5 an der Spule oder Spulenhülse 3, ist die Membran 5 nach einer bestimmten Betriebsdauer abgenutzt. Die Abnutzung zeigt sich darin, dass die Membran 5 porös ist und undichte Stellen aufweist. Als Folge ist ein sicherer Wechsel der Spule oder Spulenhülse 3 nicht mehr gewährleistet. Es ist daher notwendig, die abgenutzte Membran 5 nach einer bestimmten Betriebsdauer gegen eine neue Membran 5 auszutauschen.When changing a bobbin or bobbin case 3, the membrane 5 is acted upon by compressed air via the air duct 12. The membrane 5 is thereby detached from the inner wall 4 of the holding element 2 and grasps the coil or bobbin case 3 at its outer end area. The bobbin or bobbin tube 3 can then be transferred to a transport device or spindle (not shown). In order to release the bobbin or bobbin case 3 in the holding element 2 again, the diaphragm 5 is relieved by removing the compressed air. Due to the alternating loading and unloading of the diaphragm 5 in the holding element 2, and the friction of the diaphragm 5 on the coil or bobbin case 3, the diaphragm 5 is worn out after a certain period of operation. The wear is shown by the fact that the membrane 5 is porous and has leaks. As a result, a safe exchange of the bobbin or bobbin case 3 is no longer guaranteed. It is therefore necessary to replace the worn membrane 5 with a new membrane 5 after a certain period of operation.

Ein wesentlicher Nachteil des in Fig.1 und Fig.2 dargestellten Greifers 1 besteht darin, dass sich der Austausch einer abgenutzten Membran 5 gegen eine neue Membran 5 als sehr aufwändig gestaltet. Um eine Membran 5 auszutauschen, muss der Greifer 1 zuerst vom Bedienpersonal vom Dofferbalken entfernt werden. Hierzu werden die elastischen Haltelaschen 15 ausgeklinkt. Die abgenutzte Membran 5 kann dann durch lösen der Verschlusskappen 7 vom Halteelement 2 getrennt und gegen eine neue Membran 5 ausgetauscht werden. Die neue Membran 5 wird anschliessend durch die Verschlusskappen 7 wieder in axialer Richtung am Halteelement 2 fixiert und der Greifer 1 über die elastischen Haltelaschen 15 an den Dofferbalken angeklipst. Aufgrund des Aufbaus des Greifers 1 gestaltet sich der Austausch einer abgenutzten Membran 5 daher als sehr aufwändig, da der gesamte Greifer 1 vom Dofferbalken entfernt werden muss. Ein Austausch der Membran 5 ist dadurch mit langen Stillstandszeiten der Spinnmaschine verbunden. Zudem kommt es aufgrund der häufigen Montage und Demontage des Greifers 1 am Dofferbalken zu einer unnötigen Abnutzung der elastischen Haltelaschen 15. Als Folge ist eine ausreichende Klemmwirkung der elastischen Haltelaschen 15 am Dofferbalken nicht mehr sichergestellt.A major disadvantage of the in Fig.1 and Fig.2 shown gripper 1 consists in the fact that the replacement of a worn membrane 5 for a new membrane 5 designed as very elaborate. In order to replace a membrane 5, the gripper 1 must first be removed from the doffer bar by the operating personnel. For this purpose, the elastic retaining tabs 15 are notched. The worn membrane 5 can then be separated from the holding element 2 by loosening the closure caps 7 and exchanged for a new membrane 5. The new membrane 5 is then fixed again in the axial direction on the holding element 2 by the closure caps 7 and the gripper 1 is clipped onto the doffer bar via the elastic holding tabs 15. Due to the structure of the gripper 1, the replacement of a worn membrane 5 is therefore very complex, since the entire gripper 1 has to be removed from the doffer beam. An exchange of the membrane 5 is associated with long downtimes of the spinning machine. In addition, the frequent assembly and dismantling of the gripper 1 on the doffer beam leads to unnecessary wear of the elastic retaining tabs 15. As a result, a sufficient clamping effect of the elastic retaining tabs 15 on the doffer beam is no longer ensured.

Darstellung der ErfindungPresentation of the invention

Die Erfindung stellt sich nunmehr die Aufgabe, diesen Nachteil des bekannten Greifers zu beseitigen.The invention now has the task of eliminating this disadvantage of the known gripper.

Die Aufgabe wird erfindungsgemäss dadurch gelöst, dass das Halteelement über ein Sicherungselement am Befestigungselement gehalten ist. Über das Sicherungselement ist das Halteelement quer zu seiner Längsachse am Befestigungselement gesichert. Im Unterschied zum Greifer aus dem Stand der Technik sind das Befestigungselement und das Halteelement voneinander getrennt, d.h das Befestigungselement und das Halteelement stellen zwei getrennte Bauteile dar. Der Greifer muss dadurch zur Auswechselung des Klemmelements nicht mehr vom Dofferbalken entfernt werden. Vielmehr ist es möglich, den Greifer am Dofferbalken zu belassen und das Halteelement mit dem Klemmelement vom Befestigungselement durch Lösen des Sicherungselements zu entfernen. Das abgenutzte Klemmelement kann dann einfach gegen ein neues Klemmelement ausgetauscht werden. Die Stillstandszeit der Spinnmaschine während der Auswechselung eines Klemmelements wird dadurch gering gehalten. Zudem wird eine unnötige Abnutzung der elastischen Haltelaschen am Befestigungselement verhindert. Eine ausreichende Klemmwirkung der elastischen Haltelaschen am Dofferbalken ist damit gewährleistet.The object is achieved according to the invention in that the holding element is held on the fastening element via a securing element. The retaining element is secured to the fastening element transversely to its longitudinal axis via the securing element. In contrast to the gripper from the prior art, the fastening element and the holding element are separate from one another, ie the fastening element and the holding element represent two separate components. The gripper no longer has to be removed from the doffer bar to replace the clamping element. Rather, it is possible to leave the gripper on the doffer beam and to remove the holding element with the clamping element from the fastening element by loosening the securing element. The worn clamping element can then simply be exchanged for a new clamping element. The downtime of the spinning machine while a clamping element is being replaced is kept short. In addition, a prevents unnecessary wear of the elastic retaining tabs on the fastening element. A sufficient clamping effect of the elastic retaining tabs on the doffer beam is guaranteed.

Weiter hat es sich erfindungsgemäss als vorteilhaft erwiesen, wenn das Sicherungselement die Aussenwandung des Halteelements teilweise umschliesst bzw. teilweise an der Aussenwandung des Halteelements anliegt. Hierdurch ist sichergestellt, dass das Halteelement ausreichend am Befestigungselement gehalten bzw. positioniert ist. Das Sicherungselement stellt dabei neben dem Befestigungselement ein Teil des Gehäuses des Greifers dar. Vorteilhafterweise umschliesst das Sicherungselement zwischen 180°-270° der Aussenwandung des Halteelements.Furthermore, it has proven to be advantageous according to the invention if the securing element partially surrounds the outer wall of the holding element or rests partially on the outer wall of the holding element. This ensures that the holding element is adequately held or positioned on the fastening element. In addition to the fastening element, the securing element represents a part of the housing of the gripper. The securing element advantageously encloses the outer wall of the holding element between 180 ° -270 °.

Erfindungsgemäss ist das Sicherungselement über eine Schnappverbindung mit dem Befestigungselement verbunden. Hierdurch ist das Sicherungselement einfach vom Befestigungselement trennbar und somit das Halteelement mit dem Klemmelement schnell vom Befestigungselement entfernbar. Die Schnappverbindung ist dabei derart ausgebildet, dass das Befestigungselement Erhöhungen und das Sicherungselement Vertiefungen aufweist, welche die Erhöhungen umschliessen. Umgekehrt ist es aber auch möglich, dass das Sicherungselement Erhöhungen und das Befestigungselement Vertiefungen aufweist, welche die Erhöhungen umschliessen.According to the invention, the securing element is connected to the fastening element via a snap connection. As a result, the securing element can be easily separated from the fastening element and thus the holding element with the clamping element can be quickly removed from the fastening element. The snap connection is designed in such a way that the fastening element has elevations and the securing element has depressions which enclose the elevations. Conversely, however, it is also possible for the securing element to have elevations and the fastening element to have depressions which enclose the elevations.

Erfindungsgemäss ist das Klemmelement über einen ersten Teilbereich seines Umfangs über das Befestigungselement und über einen zweiten Teilbereich seines Umfangs über das Sicherungselement wenigstens an einem seiner Enden in Richtung der Längsachse am Halteelement fixiert. Auch ist es vorteilhaft, wenn das Klemmelement bzw. die Membran an seinen beiden Enden, d.h am unteren und am oberen Ende des Halteelements, über einen ersten Teilbereich seines Umfangs über das Befestigungselement und über einen zweiten Teilbereich seines Umfangs über das Sicherungselement in Richtung der Längsachse des Halteelements am Halteelement fixiert ist. Im Unterschied zum Stand der Technik entfallen dadurch die beiden Verschlusskappen zur axialen Fixierung des Klemmelements am Halteelement. Um eine ausreichende axiale Fixierung des Klemmelements am Halteelement zu erreichen, hat es sich weiter als vorteilhaft erwiesen, wenn das Klemmelement über 180° des Umfangs des Klemmelements über das Befestigungselement und über 180° des Umfangs des Klemmelements über das Sicherungselement am Halteelement fixiert ist.According to the invention, the clamping element is fixed over a first portion of its circumference via the fastening element and over a second portion of its circumference via the securing element at least at one of its ends in the direction of the longitudinal axis on the holding element. It is also advantageous if the clamping element or the membrane at its two ends, ie at the lower and upper end of the holding element, over a first portion of its circumference over the fastening element and over a second portion of its circumference over the securing element in the direction of the longitudinal axis of the holding element is fixed on the holding element. In contrast to the prior art, this means that the two closure caps for axially fixing the clamping element on the holding element are omitted. In order to achieve sufficient axial fixation of the clamping element on the holding element, it has also proven to be advantageous proven when the clamping element is fixed over 180 ° of the circumference of the clamping element via the fastening element and over 180 ° of the circumference of the clamping element via the securing element on the holding element.

Zur besseren Abdichtung des Klemmelements gegenüber dem Halteelement ist es zudem von Vorteil, wenn wenigstens an einem Ende des Halteelements zwischen dem Klemmelement und dem Befestigungselement ein Dichtungsring angeordnet ist. Der Dichtungsring ist dabei entweder am unteren oder am oberen Ende des Halteelements oder am unteren und am oberen Ende des Halteelements angeordnet. Der Dichtungsring liegt mit einer ersten Stirnfläche am Befestigungselement an und drückt mit einer zweiten Stirnfläche das Klemmelement gegen das Halteelement. Auch ist es möglich, dass der Dichtungsring mit seinem Aussenumfang am Befestigungselement anliegt und mit seinem Innenumfang das Klemmelement gegen das Halteelement drückt.For better sealing of the clamping element with respect to the holding element, it is also advantageous if a sealing ring is arranged at least at one end of the holding element between the clamping element and the fastening element. The sealing ring is arranged either at the lower or at the upper end of the holding element or at the lower and the upper end of the holding element. The sealing ring rests with a first end face on the fastening element and presses the clamping element against the holding element with a second end face. It is also possible for the outer circumference of the sealing ring to lie against the fastening element and for its inner circumference to press the clamping element against the holding element.

Auch hat es sich als vorteilhaft erwiesen, wenn an der Innenwandung des Halteelements abgerundete Erhöhungen angeordnet sind, welche sich über eine Länge des Halteelements erstrecken. Die Länge des Halteelements stellt dabei die Abmessung des Halteelements in seiner Längsrichtung dar. Die abgerundeten Erhöhungen stellen sicher, dass das Klemmelement nicht an der Innenwandung des Halteelements anhaftet. Eine sichere Auswechselung der Spule oder Spulenhülse ist damit gewährleistet. Vorteilhafterweise sind die Erhöhungen halbrund ausgebildet.It has also proven to be advantageous if rounded elevations are arranged on the inner wall of the holding element, which elevations extend over a length of the holding element. The length of the holding element represents the dimensions of the holding element in its longitudinal direction. The rounded elevations ensure that the clamping element does not adhere to the inner wall of the holding element. A safe exchange of the coil or the bobbin case is guaranteed. The elevations are advantageously designed to be semicircular.

Weiter ist es von Vorteil, wenn an der Aussenwandung des Halteelements über wenigstens einen Teil des Umfangs des Halteelements wenigstens eine Rippe angeordnet ist. Die Rippe dient als eine Auflagefläche für das Sicherungselement und stellt sicher, dass das Halteelement über das Sicherungselement ausreichend am Befestigungselement gehalten bzw. positioniert ist. Die Rippe ist vorteilhafterweise in Umfangsrichtung verlaufend am Halteelement angeordnet. Die Rippe umschliesst dabei das Haltelement vollständig oder einen Teil des Umfangs des Halteelements, vorzugsweise zwischen 90°-270°. Die Rippe kann aber auch in Längsrichtung verlaufend am Halteelement angeordnet sein. Hierbei können mehrere voneinander beabstandete Rippen am Halteelement angeordnet sein.It is also advantageous if at least one rib is arranged on the outer wall of the holding element over at least part of the circumference of the holding element. The rib serves as a support surface for the securing element and ensures that the holding element is sufficiently held or positioned on the fastening element via the securing element. The rib is advantageously arranged to run in the circumferential direction on the holding element. The rib encloses the holding element completely or part of the circumference of the holding element, preferably between 90 ° -270 °. However, the rib can also be arranged on the holding element running in the longitudinal direction. In this case, several ribs spaced apart from one another can be arranged on the holding element.

Darüber hinaus ist es vorteilhaft, wenn der Luftkanal mit dem Halteelement einstückig verbunden ist und das Befestigungselement eine Aufnahme für den Luftkanal aufweist. Der Begriff "einstückig" bedeutet, dass der Luftkanal fest in das Halteelement integriert ist, d.h der Luftkanal ist vom Halteelement nicht trennbar. Dies hat den Vorteil, dass das Halteelement und der Luftkanal in Form eines einzigen Spritzgussteils gefertigt werden können. Das Halteelement ist über den Luftkanal lose mit der Aufnahme des Befestigungselements verbunden, d.h das Halteelement kann über den Luftkanal in die Aufnahme gesteckt werden. Die Aufnahme weist hierzu eine geringfügig kleinere Abmessung als der Luftkanal auf. Die Aufnahme erstreckt sich vollständig oder teilweise über die Länge des Luftkanals.In addition, it is advantageous if the air duct is connected in one piece to the holding element and the fastening element has a receptacle for the air duct. The term "one-piece" means that the air duct is firmly integrated into the holding element, i.e. the air duct cannot be separated from the holding element. This has the advantage that the holding element and the air duct can be manufactured in the form of a single injection-molded part. The retaining element is loosely connected to the receptacle of the fastening element via the air duct, i.e. the retaining element can be inserted into the receptacle via the air duct. For this purpose, the receptacle has a slightly smaller dimension than the air duct. The receptacle extends completely or partially over the length of the air duct.

Hierbei hat es sich weiter als vorteilhaft erwiesen, wenn der Luftkanal an einer Aussenfläche wenigstens einen ringförmigen Absatz aufweist, welcher eine Dichtstelle zwischen dem Luftkanal und dem Befestigungselement bildet. Der Absatz erstreckt sich über eine Länge von 2-10 mm des Luftkanals und ist aus einem elastischen Kunststoff. Der Absatz ist einstückig mit dem Luftkanal verbunden. Wird das Klemmelement mit Druckluft beaufschlagt, dehnt sich der Luftkanal in radialer Richtung in der Aufnahme aus. Der Absatz wird hierbei gegen das Befestigungselement gedrückt und dichtet den Luftkanal gegenüber der Aufnahme ab.It has also proven to be advantageous here if the air duct has at least one annular shoulder on an outer surface which forms a sealing point between the air duct and the fastening element. The shoulder extends over a length of 2-10 mm of the air duct and is made of an elastic plastic. The shoulder is integrally connected to the air duct. If compressed air is applied to the clamping element, the air duct expands in the radial direction in the receptacle. The shoulder is pressed against the fastening element and seals the air duct from the receptacle.

Schliesslich ist es von Vorteil, wenn in der Aufnahme zwischen dem Befestigungselement und dem Luftkanal ein zusätzliches Dichtungselement angeordnet ist. Das Dichtungselement dichtet den Luftkanal gegenüber dem Befestigungselement und dem Dofferbalken ab. Das Dichtungselement ist vorteilhafterweise als eine Hülse aus Gummi ausgebildet und erstreckt sich teilweise über die Länge des Luftkanals. Zur besseren Abdichtung weist das Dichtungselement an seiner Aussenfläche zwei beabstandete in Umfangsrichtung verlaufende Rippen auf.Finally, it is advantageous if an additional sealing element is arranged in the receptacle between the fastening element and the air duct. The sealing element seals the air duct from the fastening element and the doffer beam. The sealing element is advantageously designed as a sleeve made of rubber and extends partially over the length of the air duct. For better sealing, the sealing element has two spaced-apart ribs running in the circumferential direction on its outer surface.

Kurze Beschreibung der FigurenBrief description of the figures

Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer in den Figuren dargestellten Ausführungsform, wobei zeigen:

Fig.1
eine perspektivische Ansicht eines zum Stand der Technik gehörenden Greifers;
Fig.2
einen Längsschnitt des Greifers nach Figur 1;
Fig.3
eine perspektivische Ansicht eines erfindungsgemässen Greifers;
Fig.4
einen Längsschnitt des Greifers nach Figur 3; und
Fig.5
einen Querschnitt des Greifers nach Figur 3.
Further features of the invention emerge from the following description of an embodiment shown in the figures, in which:
Fig. 1
a perspective view of a prior art gripper;
Fig. 2
a longitudinal section of the gripper Figure 1 ;
Fig. 3
a perspective view of a gripper according to the invention;
Fig. 4
a longitudinal section of the gripper Figure 3 ; and
Fig. 5
a cross section of the gripper Figure 3 .

Wege zur Ausführung der ErfindungWays of Carrying Out the Invention

Fig. 3 zeigt eine perspektivische Ansicht eines erfindungsgemässen Greifers 1. Der Greifer 1 ist aus Kunststoff hergestellt und besitzt ein zylindrisches Halteelement 2 für eine Spule oder Spulenhülse 3 (Fig. 4). Das Halteelement 2 weist eine Innenwandung 4 auf, an welcher ein pneumatisch verstellbares Klemmelement 5 in Form einer Membran aus Gummi angeordnet ist. Mit der Membran 5 ist es möglich, den Endbereich der in das Innere des Halteelements 2 eingeführten Spule oder Spulenhülse 3 von aussen zu erfassen. Die Verstellung der Membran 5 erfolgt in Richtung des Doppelpfeiles 6 über eine pneumatische Einrichtung. Zur Befestigung des Greifers 1 an einem nicht dargestellten Dofferbalken, umfasst der Greifer 1 ein Befestigungselement 11. Am Befestigungselement 11 sind zwei elastische Haltelaschen 15 angeordnet, die mit ihrem ersten Ende 16 mit dem Befestigungselement 11 verbunden sind. Mit ihrem zweiten freien Ende 17 ist der Greifer 1 ausrastbar und lösbar am Dofferbalken anbringbar. Die Halte- bzw. Klemmwirkung der Haltelaschen 15 wird von einer unterhalb der Haltelaschen 15 im Befestigungselement 11 eingebetteten Stahlfeder 18 erhöht bzw. unterstützt. Fig. 3 shows a perspective view of a gripper 1 according to the invention. The gripper 1 is made of plastic and has a cylindrical holding element 2 for a bobbin or bobbin case 3 ( Fig. 4 ). The holding element 2 has an inner wall 4 on which a pneumatically adjustable clamping element 5 in the form of a membrane made of rubber is arranged. With the membrane 5 it is possible to detect the end region of the coil or coil sleeve 3 introduced into the interior of the holding element 2 from the outside. The adjustment of the membrane 5 takes place in the direction of the double arrow 6 via a pneumatic device. To attach the gripper 1 to a doffer beam (not shown), the gripper 1 comprises a fastening element 11. Two elastic retaining tabs 15 are arranged on the fastening element 11, and their first end 16 is connected to the fastening element 11. With its second free end 17, the gripper 1 can be disengaged and releasably attached to the doffer beam. The holding or clamping effect of the holding tabs 15 is increased or supported by a steel spring 18 embedded in the fastening element 11 below the holding tabs 15.

Im Unterschied zum bekannten Greifer 1 aus Fig. 1 und Fig. 2 ist das Halteelement 2 über ein Sicherungselement 19 am Befestigungselement 11 gehalten. Das Sicherungselement 19 umschliesst dabei 180° der Aussenwandung 20 des Halteelements 2, bzw. liegt über 180° an der Aussenwandung 20 des Halteelements 2 an (Fig. 5). Das Sicherungselement 19 stellt somit neben dem Befestigungselement 11 ein Teil des Gehäuses des Greifers 1 dar. Über das Sicherungselement 19 ist das Halteelement 2 quer zu seiner Längsachse 10 am Befestigungselement 11 gesichert. An der Aussenwandung 20 des Halteelements 2 ist über den gesamten Umfang des Halteelements 2 eine Rippe 21 angeordnet. Die Rippe 21 dient als Auflagefläche für das Sicherungselement 19 und gewährleistet, dass das Halteelement 2 über das Sicherungselement 19 ausreichend am Befestigungselement 11 gehalten bzw. positioniert ist. Wie aus Fig. 5 hervorgeht, ist das Sicherungselement 19 mit dem Befestigungselement 11 lösbar über eine Schnappverbindung verbunden. Die Schnappverbindung ist dabei derart ausgebildet, dass das Befestigungselement 11 Erhöhungen 22 und das Sicherungselement 19 Laschen 23 mit Vertiefungen 24 aufweist, welche die Erhöhungen 22 umschliessen bzw. in welche die Erhöhungen 22 einrasten.In contrast to the known gripper 1 from FIGS. 1 and 2 the holding element 2 is held on the fastening element 11 via a securing element 19. The security element 19 encloses 180 ° of the outer wall 20 of the holding element 2, or rests over 180 ° on the outer wall 20 of the holding element 2 ( Fig. 5 ). The securing element 19 thus represents a part of the housing of the gripper 1 in addition to the fastening element 11. The retaining element 2 is secured to the fastening element 11 transversely to its longitudinal axis 10 via the securing element 19. On the outer wall 20 of the holding element 2, a rib 21 is arranged over the entire circumference of the holding element 2. The rib 21 serves as a support surface for the securing element 19 and ensures that the holding element 2 is sufficiently held or positioned on the fastening element 11 via the securing element 19. How out Fig. 5 is apparent, the securing element 19 is detachably connected to the fastening element 11 via a snap connection. The snap connection is designed in such a way that the fastening element 11 has elevations 22 and the securing element 19 has tabs 23 with recesses 24 which enclose the elevations 22 or in which the elevations 22 snap.

Die Membran 5 ist sowohl an einem unteren Ende 8 wie auch an einem oberen Ende 9 des Halteelements 2 über 180° des Umfangs der Membran 5 über das Befestigungselement 11 und über 180° des Umfangs der Membran 5 über das Sicherungselement 19 in axialer Richtung am Halteelement 2 fixiert. Im Unterschied zum Stand der Technik entfallen dadurch die beiden Verschlusskappen 7 bzw. Klemmen zur axialen Fixierung der Membran 5 am Halteelement 2. Zur besseren Abdichtung der Membran 5 gegenüber dem Halteelement 2 ist jeweils am unteren Ende 8 und am oberen Ende 9 des Halteelements 2 zwischen der Membran 5 und dem Befestigungselement 11 und dem Sicherungselement 19 ein Dichtungsring 25 angeordnet. Der Dichtungsring 25 liegt mit einer ersten Stirnfläche 26 am Befestigungselement 11 und am Sicherungselement 19 an und drückt mit einer zweiten Stirnfläche 27 die Membran 5 gegen das untere Ende 8 bzw. das obere Ende 9 des Halteelements 2. Das Halteelement 2 ist an seiner Innenwandung 4 mit halbrunden Erhöhungen 28 versehen, die sich über die Länge des Halteelements 2 erstrecken (Fig. 5).The membrane 5 is both at a lower end 8 and at an upper end 9 of the holding element 2 over 180 ° of the circumference of the membrane 5 over the fastening element 11 and over 180 ° of the circumference of the membrane 5 over the securing element 19 in the axial direction on the holding element 2 fixed. In contrast to the prior art, the two closure caps 7 or clamps for axially fixing the membrane 5 on the holding element 2 are omitted. For better sealing of the membrane 5 with respect to the holding element 2, there is between the lower end 8 and the upper end 9 of the holding element 2 the membrane 5 and the fastening element 11 and the securing element 19, a sealing ring 25 is arranged. The sealing ring 25 rests with a first end face 26 on the fastening element 11 and on the securing element 19 and with a second end face 27 presses the membrane 5 against the lower end 8 or the upper end 9 of the holding element 2. The holding element 2 is on its inner wall 4 provided with semicircular elevations 28, which extend over the length of the holding element 2 ( Fig. 5 ).

Das Halteelement 2 ist zudem mit einem Luftkanal 12 versehen. Der Luftkanal 12 ist mit der Aussenwandung 20 des Halteelements 2 fest verbunden, d.h. das Halteelement 2 und der Luftkanal 12 sind einstückig ausgebildet. An seiner Aussenfläche 30 weist der Luftkanal 12 einen ringförmigen Absatz 31 auf. Der Absatz 31 erstreckt sich über eine Länge 32 von 8mm des Luftkanals 12 und ist aus einem elastischen Kunststoff. Der Absatz 31 ist einstückig mit dem Luftkanal 12 verbunden. Das Befestigungselement 11 weist eine Aufnahme 33 für den Luftkanal 12 auf. Die Aufnahme 33 ist zylindrisch ausgebildet und erstreckt sich über die Länge des Luftkanals 12. Das Halteelement 2 ist über den Absatz 31 des Luftkanals 12 lose mit dem Befestigungselement 11 verbunden. Wird die Membran 5 mit Druckluft beaufschlagt, dehnt sich der Luftkanal 12 in radialer Richtung in der Aufnahme 33 aus. Hierdurch wird der Absatz 31 gegen das Befestigungselement 11 gedrückt und dichtet den Luftkanal 12 gegenüber dem Befestigungselement 11 ab.The holding element 2 is also provided with an air duct 12. The air duct 12 is firmly connected to the outer wall 20 of the holding element 2, ie the holding element 2 and the air duct 12 are integrally formed. The air duct 12 has an annular shoulder 31 on its outer surface 30. The shoulder 31 extends over a length 32 of 8 mm of the air duct 12 and is made of an elastic plastic. The shoulder 31 is connected in one piece to the air duct 12. The fastening element 11 has a receptacle 33 for the air duct 12. The receptacle 33 is cylindrical and extends over the length of the air duct 12. The holding element 2 is loosely connected to the fastening element 11 via the shoulder 31 of the air duct 12. If compressed air is applied to the membrane 5, the air duct 12 expands in the radial direction in the receptacle 33. As a result, the shoulder 31 is pressed against the fastening element 11 and seals the air duct 12 from the fastening element 11.

Zwischen dem Befestigungselement 11 und dem Luftkanal 12 ist ein zusätzliches Dichtungselement 13 angeordnet. Der Luftkanal 12 ist über das Dichtungselement 13 mit einer Druckluftleitung verbunden, die sich in Längsrichtung am Dofferbalken erstreckt. Das Dichtungselement 13 ist als eine Hülse aus Gummi ausgebildet. Mit einem ersten Ende 35 liegt das Dichtungselement 13 am ringförmigen Absatz 31 des Luftkanals 12 an. Mit einem zweiten Ende 36 dichtet das Dichtungselement 13 den Luftkanal 12 gegenüber der Druckluftleitung am Dofferbalken ab. Zur besseren Abdichtung weist das Dichtungselement 13 an seinem Umfang zwei beabstandete Rippen 37 auf. Am Befestigungselement 11 ist zudem ein weiteres Dichtungselement 14 angeordnet, das den Greifer 1 gegenüber einer Druckluftsignalleitung abdichtet, die sich ebenfalls in Längsrichtung am Dofferbalken erstreckt. Auch das Dichtungselement 14 weist zur besseren Abdichtung an seinem Umfang zwei beabstandete Rippen 37 auf.An additional sealing element 13 is arranged between the fastening element 11 and the air duct 12. The air duct 12 is connected via the sealing element 13 to a compressed air line which extends in the longitudinal direction on the doffer beam. The sealing element 13 is designed as a sleeve made of rubber. The sealing element 13 rests with a first end 35 on the annular shoulder 31 of the air duct 12. With a second end 36, the sealing element 13 seals the air duct 12 from the compressed air line on the doffer beam. For better sealing, the sealing element 13 has two spaced apart ribs 37 on its circumference. A further sealing element 14 is also arranged on the fastening element 11, which seals the gripper 1 against a compressed air signal line which also extends in the longitudinal direction on the doffer beam. The sealing element 14 also has two spaced apart ribs 37 on its circumference for better sealing.

Im Unterschied zum bekannten Greifer muss der erfindungsgemässe Greifer 1 zur Auswechselung einer Membran 5 nicht mehr als Gesamtes vom Dofferbalken entfernt werden. Vielmehr ist es möglich, den Greifer 1 am Dofferbalken zu belassen und das Halteelement 2 vom Befestigungselement 11 zu entfernen. Hierzu wird das Sicherungselement 19 vom Befestigungselement 11 gelöst. Das Halteelement 2 kann dann vom Befestigungselement 11 getrennt werden und die abgenutzte Membran 5 gegen eine neue Membran 5 ausgetauscht werden. Die Stillstandszeit der Spinnmaschine während der Auswechselung einer Membran 5 wird dadurch gering gehalten. Zudem wird eine unnötige Abnutzung der elastischen Haltelaschen 15 am Befestigungselement 11 verhindert, da lediglich das Halteelement 2 vom Greifer 1 entfernt werden muss. Eine ausreichende Klemmwirkung der elastischen Haltelaschen 15 am Dofferbalken ist damit gewährleistet.In contrast to the known gripper, the gripper 1 according to the invention no longer has to be removed as a whole from the doffer beam in order to replace a membrane 5. Rather, it is possible to leave the gripper 1 on the doffer beam and to remove the holding element 2 from the fastening element 11. For this purpose, the securing element 19 is released from the fastening element 11. The holding element 2 can then be separated from the fastening element 11 and the worn membrane 5 can be exchanged for a new membrane 5. The downtime of the spinning machine during the replacement of a membrane 5 is thereby kept low. In addition, unnecessary wear of the elastic retaining tabs 15 on the fastening element 11 is prevented, since only the retaining element 2 has to be removed from the gripper 1. A sufficient clamping effect of the elastic retaining tabs 15 on the doffer beam is guaranteed.

BezugszeichenlisteList of reference symbols

11
GreiferGrapple
22
HalteelementRetaining element
33
Spule, SpulenhülseBobbin, bobbin case
44th
InnenwandungInner wall
55
KlemmelementClamping element
66th
DoppelpfeilDouble arrow
77th
VerschluskappenLocking caps
88th
Unterseitebottom
99
OberseiteTop
1010
LängsachseLongitudinal axis
1111
BefestigungselementFastener
1212th
LuftkanalAir duct
1313th
DichtungselementSealing element
1414th
DichtungselementSealing element
1515th
HaltelaschenRetaining tabs
1616
EndeThe End
1717th
EndeThe End
1818th
StahlfederSteel spring
1919th
SicherungselementFuse element
2020th
AussenwandungOuter wall
2121
Ripperib
2222nd
ErhöhungenIncreases
2323
LaschenTabs
2424
VertiefungenIndentations
2525th
DichtungsringSealing ring
2626th
StirnflächeFace
2727
StirnflächeFace
2828
ErhöhungenIncreases
3030th
AussenflächeOutside area
3131
Absatzparagraph
3232
Längelength
3333
Aufnahmeadmission
3535
EndeThe End
3636
EndeThe End
3737
RippenRibs

Claims (10)

  1. Gripper (1) for gripping a bobbin or bobbin tube (3), comprising a fastening element (11) and a cylindrical holding element (2) having a longitudinal axis (10), the holding element (2) having an inner wall (4) and an outer wall (20), and a pneumatically operable clamping element (5) being arranged on the inner wall (4), to which clamping element compressed air can be supplied via an air duct (12), and the holding element (2) being held on the fastening element (11) via a securing element (19), characterized in that the securing element (19) partially encloses the outer wall (20) of the holding element (2), the securing element being connected to the fastening element via a snap-fit connection, and the clamping element, at least at one of its ends in the direction of the longitudinal axis, being fixed to the holding element over a first portion of the circumference of said clamping element via the fastening element and over a second portion of the circumference of said clamping element via the securing element.
  2. Gripper according to claim 1, characterized in that the clamping element (5), at least at its ends in the direction of the longitudinal axis (10), is fixed to the holding element (2) over 180° of the circumference of the clamping element (5) via the fastening element (11) and over 180° of the circumference of the clamping element (5) via the securing element (19).
  3. Gripper according to either claim 1 or claim 2, characterized in that a sealing ring (25) is arranged between the clamping element (5) and the fastening element (11) at least at one end (8, 9) of the holding element (2).
  4. Gripper according to any of claims 1 to 3, characterized in that rounded elevations (28) are arranged on the inner wall (4) of the holding element (2) and extend over a length (29) of the holding element (2).
  5. Gripper according to any of claims 1 to 4, characterized in that at least one rib (21) is arranged on the outer wall (20) of the holding element (2) over at least part of the circumference of the holding element (2).
  6. Gripper according to any of claims 1 to 5, characterized in that the air duct (12) is integrally connected to the holding element (2) and the fastening element (11) has a receptacle (33) for the air duct (12).
  7. Gripper according to claim 6, characterized in that the air duct (12) has, on an outer surface (30), at least one annular shoulder (31) which forms a sealing point between the air duct (12) and the fastening element (11).
  8. Gripper according to either claim 6 or claim 7, characterized in that an additional sealing element (13) is arranged in the receptacle (33) between the fastening element (11) and the air duct (12).
  9. Doffer device comprising a doffer beam that has at least one gripper (1) according to any of claims 1 to 8.
  10. Spinning machine comprising a doffer device according to claim 9.
EP15791038.1A 2014-11-03 2015-10-21 Doffer gripper having a split housing Active EP3215659B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01676/14A CH710323A1 (en) 2014-11-03 2014-11-03 Doffergreifer with zweigeteiltem housing.
PCT/IB2015/058109 WO2016071789A1 (en) 2014-11-03 2015-10-21 Doffer gripper having a split housing

Publications (2)

Publication Number Publication Date
EP3215659A1 EP3215659A1 (en) 2017-09-13
EP3215659B1 true EP3215659B1 (en) 2021-03-17

Family

ID=54477038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15791038.1A Active EP3215659B1 (en) 2014-11-03 2015-10-21 Doffer gripper having a split housing

Country Status (4)

Country Link
EP (1) EP3215659B1 (en)
CN (1) CN107074478B (en)
CH (1) CH710323A1 (en)
WO (1) WO2016071789A1 (en)

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Publication number Priority date Publication date Assignee Title
CN107345324A (en) * 2017-07-28 2017-11-14 贵州金州兔产业有限公司 A kind of new rabbit hair spinning machine
DE102018201097A1 (en) 2018-01-24 2019-07-25 AUDI HUNGARIA Zrt. Handling device for gripping and handling a stator of an electrical machine, in particular for a motor vehicle
CH715389A1 (en) 2018-09-27 2020-03-31 Rieter Ag Maschf Gripper for gripping a coil or bobbin tube.

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JPS6452827A (en) * 1987-08-18 1989-02-28 Rieter Ag Maschf Bobbin replacing apparatus in fiber machine such as ring fine spinning frame
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Also Published As

Publication number Publication date
WO2016071789A1 (en) 2016-05-12
CH710323A1 (en) 2016-05-13
CN107074478A (en) 2017-08-18
CN107074478B (en) 2019-07-16
EP3215659A1 (en) 2017-09-13

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