EP3215659A1 - Doffer gripper having a split housing - Google Patents

Doffer gripper having a split housing

Info

Publication number
EP3215659A1
EP3215659A1 EP15791038.1A EP15791038A EP3215659A1 EP 3215659 A1 EP3215659 A1 EP 3215659A1 EP 15791038 A EP15791038 A EP 15791038A EP 3215659 A1 EP3215659 A1 EP 3215659A1
Authority
EP
European Patent Office
Prior art keywords
gripper
holding element
holding
fastening
membrane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15791038.1A
Other languages
German (de)
French (fr)
Other versions
EP3215659B1 (en
Inventor
Robert Nägeli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP3215659A1 publication Critical patent/EP3215659A1/en
Application granted granted Critical
Publication of EP3215659B1 publication Critical patent/EP3215659B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • 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
    • 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
    • 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 coil or bobbin, with a fastening element and a cylindrical holding element with a longitudinal axis, wherein the holding element has an inner wall and an outer wall, and on the inner wall a pneumatically actuable clamping element is arranged, which via an air channel can be acted upon with compressed air, and the retaining element is held on the fastening element via a securing element.
  • spinning machines especially in ring spinning machines, a variety already finished wound coils or cops are taken together at the spinning stations of the spinning machine and replaced by empty bobbin tubes in a bobbin changing operation.
  • the spinning machines have a doffer device with a doffer bar, which is arranged movably on the spinning machine, for example via a scissors mechanism.
  • a plurality of grippers or doffer grippers are arranged on the doffer bar in order to grasp and remove the coils or the empty bobbin tubes in common.
  • the individual grippers are preferably pneumatically actuated and include a compressed air-acted clamping element in the form of a membrane, which is brought over the coil or bobbin and then engages the coil or bobbin tube by introducing compressed air.
  • air supply ducts are arranged in the doffer bar, from which the compressed air is directed via feeds to the individual membranes of the grippers.
  • CN 2 873 813 Y describes a correspondingly designed gripper.
  • the gripper has a cylindrical holding element for receiving a coil or bobbin tube.
  • a clamping element in the form of a rubber membrane is arranged, which is adjustable via a pneumatic device. With the membrane it is possible to grasp the end region of the coil or bobbin tube inserted into the interior of the retaining element from the outside.
  • the membrane is fixed on the retaining element in the direction of a longitudinal axis by means of two sealing caps, which are respectively arranged on the underside and upper side of the retaining element. The two The end caps are clipped onto the retaining element via a snap connection.
  • the gripper comprises a fastening element.
  • the fastening element is firmly connected to the holding element and contains an air channel for the compressed air supply to the membrane.
  • the fastening element has on its upper side a hook and on its underside an elastic retaining tab.
  • the gripper is fixed via the hook on a receptacle and the elastic retaining tab in a locking groove on the doffer bar.
  • a gripper similar to the structure is shown in EP 0 303 877 A1.
  • the fastening element of the gripper has on its underside and on its upper side an elastic retaining tab.
  • About the two elastic retaining tabs of the gripper is disengaged and releasably attachable in two parallel locking grooves on the doffer bar.
  • the detent grooves allow a plurality of individual grippers to be secured along the doffer bar.
  • the membrane When changing a coil or bobbin tube, the membrane is pressurized with compressed air via the air channel. The membrane thus contracts in the holding element and detects the coil or bobbin tube at its end region from the outside. To release the coil or bobbin in the holding element again, the membrane is relieved by removing the compressed air. Due to the constantly changing load and discharge of the membrane, and the friction of the membrane on the coil or bobbin, the membrane wears off after a certain period of operation. The wear manifests itself in the fact that the membrane becomes porous and has leaks. As a result, a safe change of the coil or bobbin tube is no longer guaranteed. It is therefore necessary to replace the worn membrane with a new membrane after a certain period of operation.
  • a major disadvantage of the gripper described is that the exchange of a worn membrane against a new membrane designed as very expensive.
  • the gripper To replace a membrane, the gripper must first be removed by the operator from the doffer bar.
  • the hook is released from the doffer beam and the elastic retaining lug is disengaged from the detent groove or, in the case of the gripper from EP 0 303 877 A1, the two elastic retaining tabs disengaged from the two parallel locking grooves. Outside the doffer then the upper and lower cap are released from the holding element. The worn membrane is then separated from the retaining element and replaced with a new membrane.
  • the new membrane is then fixed by the caps again in the direction of the longitudinal axis of the holding element on the holding element and the gripper attached to the doffer bar. Due to the construction of the gripper, the replacement of a worn-out membrane is very time-consuming, since the entire gripper has to be removed from the doffer bar. An exchange of the membrane is thereby associated with long downtime of the spinning machine. In addition, due to the frequent assembly and disassembly of the gripper on the doffer bar, unnecessary wear of the elastic gripping tab of the gripper occurs. As a result, a sufficient clamping action of the elastic retaining tab is not ensured in the locking groove on the doffer bar. The invention now has the object to eliminate this drawback of the known gripper.
  • the retaining element is held by a securing element on the fastening element.
  • the retaining element is secured transversely to its longitudinal axis on the fastening element.
  • the fastening element and the holding element are separated from each other, ie, the fastening element and the holding element are two separate components.
  • the gripper must therefore not be removed from the doffer beam to replace the clamping element. Rather, it is possible to leave the gripper on the doffer bar and to remove the holding element with the clamping element from the fastener by loosening the securing element. The worn clamping element can then be easily replaced with a new clamping element.
  • the securing element partially surrounds the outer wall of the retaining element or lies partially against the outer wall of the retaining element. This ensures that the retaining element is sufficiently held or positioned on the fastening element.
  • the securing element forms, in addition to the fastening element, a part of the housing of the gripper.
  • the securing element encloses between 180 ° -270 ° of the outer wall of the holding element.
  • the securing element is connected via a snap connection with the fastening element.
  • the snap connection is designed such that the fastening element has elevations and the securing element recesses which surround the elevations.
  • the securing element has elevations and the fastening element recesses which surround 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 on 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 at the upper end of the holding element, over a first portion of its circumference on the fastening element and over a second portion of its circumference on the securing element in the direction the longitudinal axis of the holding element is fixed to the holding element. In contrast to the prior art thereby eliminating the two caps for the axial fixation of the clamping element on the holding element.
  • the clamping element is fixed over 180 ° of the circumference of the clamping element on the fastening element and over 180 ° of the circumference of the clamping element on the securing element on the holding element.
  • 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 retaining element or at the lower and at the upper end of the retaining element.
  • the sealing ring bears against the fastening element with a first end face and presses the clamping element against the retaining element with a second end face. It is also possible that the sealing ring rests with its outer circumference on the fastening element and presses with its inner circumference the clamping element against the retaining element.
  • the elevations are formed 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 bearing surface for the securing element and ensures that the retaining element is held or positioned sufficiently on the securing element via the securing element.
  • the rib is advantageously arranged circumferentially on the holding element.
  • the rib encloses the holding element completely or a part of the circumference of the holding element, preferably between 90 ° -270 °.
  • the rib can also be arranged extending in the longitudinal direction on the holding element. In this case, a plurality of spaced-apart ribs may be arranged on the holding element.
  • the air duct is integrally connected to the retaining element and the fastening element has a receptacle for the air duct.
  • integrated means that the air duct is firmly integrated into the retaining element, ie the air duct is not separable from the retaining element, which has the advantage that the retaining element and the air duct can be manufactured in the form of a single injection-molded part
  • the receptacle has for this purpose a slightly smaller dimension than the air channel
  • the receptacle extends completely or partially over the length of the air channel
  • the air duct has on an outer surface at least one annular shoulder which forms a sealing point between the air duct and the fastening element is made of an elastic plastic
  • the heel is in one piece 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 heel is pressed against the fastener and seals the
  • an additional sealing element is arranged in the receptacle between the fastening element and the air duct.
  • the sealing element seals the air duct with respect to 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 on its outer surface two spaced circumferentially extending ribs.
  • FIG. 1 shows a perspective view of a gripper according to the prior art
  • FIG. 2 shows a longitudinal section of the gripper according to FIG. 1
  • FIG. 3 shows a perspective view of a gripper according to the invention
  • FIG. 4 shows a longitudinal section of the gripper according to FIG. 3, FIG Cross section of the gripper according to FIG. 3,
  • the gripper 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 coil or bobbin tube 3 ( Figure 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.
  • a pneumatically adjustable clamping element 5 in the form of a membrane made of rubber is arranged.
  • the membrane 5 With the membrane 5, it is possible to detect the end portion of the introduced into the interior of the holding member 2 coil or bobbin tube 3 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 in the direction of a longitudinal axis 10 on the holding element 2 by means of two closure caps 7 or clamps, which are respectively arranged on the underside 8 and upper side 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 For fastening the gripper 1 to a doffer bar (not shown in FIGS. 1 and 2), the gripper 1 comprises a fastening element 11.
  • the fastening element 1 1 is fixedly connected to the holding element 2 and includes an air channel 12 for the compressed air supply of the membrane 5.
  • the air channel 12 is connected to a compressed air line, which extends in the longitudinal direction of the doffer beams.
  • the air channel 12 is sealed off from the doffer beam via a first sealing element 13 arranged on the fastening element 11.
  • the fastening element 1 1 also has a second sealing element 14, which seals the gripper 1 with respect to a compressed air signal line, which likewise extends in the longitudinal direction on the doffer bar.
  • On the fastener 1 1 1 two elastic retaining tabs 15 are arranged.
  • the elastic retaining tabs 15 are connected at their first end 16 to the fastening element 1 1. With its second free end 17 of the gripper 1 is disengaged and releasably attachable to the doffer beam. The holding or clamping action of the retaining tabs 15 is increased or supported by an embedded below the retaining tabs 15 in the fastener 1 1 steel spring 18.
  • the membrane 5 When changing a coil or bobbin tube 3, the membrane 5 is acted upon via the air channel 12 with compressed air. The membrane 5 thereby separates from the inner wall 4 of the holding element 2 and detects the coil or bobbin tube 3 at its outer end region. The spool or bobbin tube 3 can then be transferred to a transport device or spindle, not shown. To release the coil or bobbin tube 3 in the holding element 2 again, the membrane 5 is relieved by removing the compressed air. Due to the alternating load and release of the membrane 5 in the holding element 2, and the friction of the membrane 5 on the coil or bobbin tube 3, the membrane 5 is worn after a certain period of operation. The wear manifests itself in that the membrane 5 is porous and has leaks. As a result, a safe change of the coil or bobbin tube 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 gripper 1 shown in Fig.1 and Fig.2 is that the exchange of a worn membrane 5 against a new membrane 5 designed as very expensive.
  • the gripper 1 In order to exchange a membrane 5, the gripper 1 must first be removed by the operating staff from the doffer bar. For this purpose, the elastic retaining tabs 15 are disengaged. The worn-out membrane 5 can then be separated from the retaining element 2 by loosening the closure caps 7 and against a new membrane 5 be replaced. The new membrane 5 is then fixed by the caps 7 again in the axial direction on the support member 2 and the gripper 1 clipped on the elastic retaining tabs 15 on the doffer beams.
  • 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 coil or bobbin tube 3 ( Figure 4).
  • the holding element 2 has an inner wall 4, on which a pneumatically adjustable clamping element 5 is arranged in the form of a membrane made of rubber. With the membrane 5, it is possible to detect the end portion of the introduced into the interior of the holding member 2 coil or bobbin tube 3 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, which are connected at its first end 16 with the fastening element 1 1. With its second free end 17 of the gripper 1 is disengaged and releasably attachable to the doffer beam.
  • the Haltering. Clamping action of the retaining tabs 15 is increased or supported by a below the retaining tabs 15 in the fastener 1 1 embedded steel spring 18.
  • the holding element 2 is held by a securing element 19 on the fastening element 1 1.
  • the securing element 19 encloses in this case 180 ° of the outer wall 20 of the holding element 2, or lies over 180 ° on the outer wall 20 of the holding element 2 ( Figure 5).
  • the securing element 19 thus constitutes, in addition to the fastening element 1 1, a part of the housing of the gripper 1.
  • the securing element 19 is provided with the retaining element 2 transversely to its side. ner longitudinal axis 10 secured to the fastener 1 1.
  • On the outer wall 20 of the retaining element 2, a rib 21 is arranged over the entire circumference of the retaining element 2.
  • the rib 21 serves as a support surface for the securing element 19 and ensures that the holding element 2 is held or positioned on the securing element 19 sufficiently on the fastening element 1 1.
  • the securing element 19 is releasably connected to the fastening element 1 1 via a snap connection.
  • the snap connection is designed such that the fastening element 1 1 elevations 22 and the securing element 19 tabs 23 having recesses 24 which enclose the elevations 22 and in which the elevations 22 engage.
  • the membrane 5 is both at a lower end 8 as well as at an upper end 9 of the support member 2 over 180 ° of the circumference of the membrane 5 via the fastener 1 1 and over 180 ° of the circumference of the membrane 5 via the securing element 19 in the axial direction Holding element 2 fixed.
  • a sealing ring 25 is arranged for better sealing of the membrane 5 relative to the holding element 2 is at the lower end 8 and at the upper end 9 of the holding element 2 between the diaphragm 5 and the fastening element 1 1 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 presses with a second end face 27 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 are provided with semicircular elevations 28 which extend over the length of the holding element 2 ( Figure 5).
  • the holding element 2 is also provided with an air channel 12.
  • the air channel 12 is fixedly connected to the outer wall 20 of the retaining element 2, that is, the retaining element 2 and the air channel 12 are integrally formed.
  • the air channel 12 On its outer surface 30, the air channel 12 has an annular shoulder 31.
  • the shoulder 31 extends over a length 32 of 8 mm of the air channel 12 and is made of an elastic plastic.
  • the shoulder 31 is integrally connected to the air channel 12.
  • the fastening element 1 1 has a receptacle 33 for the air channel 12.
  • the receptacle 33 is cylindrical and extends over the length of the air channel 12.
  • the holding element 2 is connected via the shoulder 31 of the air channel 12 loosely connected to the fastening element 1 1.
  • the membrane 5 If the membrane 5 is acted upon by compressed air, the air channel 12 expands in the direction 5 dialer direction in the receptacle 33. As a result, the shoulder 31 is pressed against the fastening element 1 1 and seals the air channel 12 relative to the fastening element 1 1.
  • an additional Diehl o processing element 13 is arranged between the fastening element 1 1 and the air channel 12.
  • the air duct 12 is connected via the sealing element 13 with a compressed air line which extends in the longitudinal direction of the doffer bar.
  • the sealing member 13 is formed as a sleeve of rubber. With a first end 35, the sealing element 13 bears against the annular shoulder 31 of the air channel 12. With a second end 36, the sealing element 13 seals the air duct 12 against the compressed air line on the doffer bar.
  • the sealing element 13 has at its periphery two spaced ribs 37.
  • a further sealing element 14 is also arranged, which seals the gripper 1 against a compressed air signal line, which also extends in the longitudinal direction of the doffer bar.
  • the sealing element 14 also has two spaced-apart ribs 37 on its circumference for better sealing.
  • the gripper 1 according to the invention does not have to be removed from the doffer bar as a whole to replace a membrane 5. Rather, it is possible to leave the gripper 1 on the doffer bar and the
  • the securing element 19 is released from the fastening element 1 1.
  • the holding element 2 can then be separated from the fastening element 11 and the worn-out membrane 5 can be exchanged for a new membrane 5.
  • the downtime of the spinning machine during the replacement of a membrane 5 is kept low. moreover

Abstract

The invention relates to a gripper (1) for gripping a bobbin or bobbin sleeve (3), said gripper (1) comprising a fastening element (11) and a cylindrical holding element (2) that has a longitudinal axis (10); the holding element (2) has an inner wall (4) and an outer wall (20); a pneumatically operated clamping element (5) to which compressed air can be supplied via an air duct (12) is arranged on the inner wall (4). In order to simplify the design of the gripper (1), the holding element (2) is retained on the fastening element (11) by a securing element (19) that surrounds part of the outer wall (20) of the holding element (2).

Description

Doffergreifer mit zweigeteiltem Gehäuse  Doffer gripper with two-part housing
Die Erfindung bezieht sich auf einen Greifer zum Greifen einer Spule oder Spulenhülse, mit einem Befestigungselement und einem zylindrischen Halteelement mit einer Längs- achse, wobei das Halteelement eine Innenwandung und eine Aussenwandung aufweist, und an der Innenwandung ein pneumatisch betätigbares Klemmelement angeordnet ist, welches über einen Luftkanal mit Druckluft beaufschlagbar ist, und das Halteelement über ein Sicherungselement am Befestigungselement gehalten ist. 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 druckluft- beaufschlagbares 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. 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 einge- führten 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 Ver- schlusskappen sind dabei über eine Schnappverbindung an das Halteelement ange- klippst. 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 invention relates to a gripper for gripping a coil or bobbin, with a fastening element and a cylindrical holding element with a longitudinal axis, wherein the holding element has an inner wall and an outer wall, and on the inner wall a pneumatically actuable clamping element is arranged, which via an air channel can be acted upon with compressed air, and the retaining element is held on the fastening element via a securing element. In a variety of spinning machines, especially in ring spinning machines, a variety already finished wound coils or cops are taken together at the spinning stations of the spinning machine and replaced by empty bobbin tubes in a bobbin changing operation. For this purpose, the spinning machines have a doffer device with a doffer bar, which is arranged movably on the spinning machine, for example via a scissors mechanism. In turn, a plurality of grippers or doffer grippers are arranged on the doffer bar in order to grasp and remove the coils or the empty bobbin tubes in common. The individual grippers are preferably pneumatically actuated and include a compressed air-acted clamping element in the form of a membrane, which is brought over the coil or bobbin and then engages the coil or bobbin tube by introducing compressed air. For pressurizing the individual grippers with compressed air, air supply ducts are arranged in the doffer bar, from which the compressed air is directed via feeds to the individual membranes of the grippers. CN 2 873 813 Y describes a correspondingly designed gripper. The gripper has a cylindrical holding element for receiving a coil or bobbin tube. On the inner wall of the holding element, a clamping element in the form of a rubber membrane is arranged, which is adjustable via a pneumatic device. With the membrane it is possible to grasp the end region of the coil or bobbin tube inserted into the interior of the retaining element from the outside. The membrane is fixed on the retaining element in the direction of a longitudinal axis by means of two sealing caps, which are respectively arranged on the underside and upper side of the retaining element. The two The end caps are clipped onto the retaining element via a snap connection. For attachment to a doffer beam, the gripper comprises a fastening element. The fastening element is firmly connected to the holding element and contains an air channel for the compressed air supply to the membrane. The fastening element has on its upper side a hook and on its underside an elastic retaining tab. The gripper is fixed via the hook on a receptacle and the elastic retaining tab in a locking groove on the doffer bar. A gripper similar to the structure is shown in EP 0 303 877 A1. In contrast to the above-described gripper, the fastening element of the gripper has on its underside and on its upper side an elastic retaining tab. About the two elastic retaining tabs of the gripper is disengaged and releasably attachable in two parallel locking grooves on the doffer bar. The detent grooves allow a plurality of individual grippers to be secured along the doffer bar.
Beim Wechseln einer Spule oder Spulenhülse wird die Membran über den Luftkanal mit Druckluft beaufschlagt. Die Membran zieht sich dadurch im Halteelement zusammen und erfasst die Spule oder Spulenhülse an ihrem Endbereich von Aussen. Um die Spule oder Spulenhülse im Halteelement wieder freizugeben, wird die Membran durch Wegnahme der Druckluft entlastet. Aufgrund der ständig wechselnden Belastung und Entlastung der Membran, und der Reibung der Membran an der Spule oder Spulenhülse, nutzt sich die Membran nach einer bestimmten Betriebsdauer ab. Die Abnutzung zeigt sich darin, dass die Membran porös wird und undichte Stellen aufweist. Als Folge ist ein sicherer Wechsel der Spule oder Spulenhülse nicht mehr gewährleistet. Es ist daher notwendig, die abgenutzte Membran nach einer bestimmten Betriebsdauer gegen eine neue Membran auszutauschen. When changing a coil or bobbin tube, the membrane is pressurized with compressed air via the air channel. The membrane thus contracts in the holding element and detects the coil or bobbin tube at its end region from the outside. To release the coil or bobbin in the holding element again, the membrane is relieved by removing the compressed air. Due to the constantly changing load and discharge of the membrane, and the friction of the membrane on the coil or bobbin, the membrane wears off after a certain period of operation. The wear manifests itself in the fact that the membrane becomes porous and has leaks. As a result, a safe change of the coil or bobbin tube is no longer guaranteed. It is therefore necessary to replace the worn membrane with a new membrane after a certain period of operation.
Ein wesentlicher Nachteil des beschriebenen Greifers besteht darin, dass sich der Austausch einer abgenutzten Membran gegen eine neue Membran als sehr aufwändig gestaltet. Um eine Membran auszutauschen, muss der Greifer zuerst vom Bedienpersonal vom Dofferbalken entfernt werden. Hierzu wird beim Greifer aus der CN 2 873 813 Y der Haken von der Aufnahme des Dofferbalkens gelöst und die elastische Haltelasche aus der Rastnut ausgeklinkt oder beim Greifer aus der EP 0 303 877 A1 die beiden elastischen Haltelaschen aus den beiden parallelen Rastnuten ausgeklinkt. Ausserhalb der Doffervorrichtung werden dann die obere und die untere Verschlusskappe vom Halteelement gelöst. Die abgenutzte Membran wird dann vom Halteelement getrennt und gegen eine neue Membran ausgetauscht. Die neue Membran wird anschliessend durch die Verschlusskappen wieder in Richtung der Längsachse des Halteelements am Halteelement fixiert und der Greifer am Dofferbalken angebracht. Aufgrund des Aufbaus des Greifers gestaltet sich der Austausch einer abgenutzten Membran als sehr aufwändig, da der gesamte Greifer vom Dofferbalken entfernt werden muss. Ein Austausch der Membran ist dadurch mit langen Stillstandszeiten der Spinnmaschine verbunden. Zu- dem kommt es aufgrund der häufigen Montage und Demontage des Greifers am Dofferbalken zu einer unnötigen Abnutzung der elastischen Haltelasche des Greifers. Als Folge ist eine ausreichende Klemmwirkung der elastischen Haltelasche in der Rastnut am Dofferbalken nicht sichergestellt. Die Erfindung stellt sich nunmehr die Aufgabe diesen Nachteil des bekannten Greifers zu beseitigen. A major disadvantage of the gripper described is that the exchange of a worn membrane against a new membrane designed as very expensive. To replace a membrane, the gripper must first be removed by the operator from the doffer bar. For this purpose, in the gripper from CN 2 873 813 Y, the hook is released from the doffer beam and the elastic retaining lug is disengaged from the detent groove or, in the case of the gripper from EP 0 303 877 A1, the two elastic retaining tabs disengaged from the two parallel locking grooves. Outside the doffer then the upper and lower cap are released from the holding element. The worn membrane is then separated from the retaining element and replaced with a new membrane. The new membrane is then fixed by the caps again in the direction of the longitudinal axis of the holding element on the holding element and the gripper attached to the doffer bar. Due to the construction of the gripper, the replacement of a worn-out membrane is very time-consuming, since the entire gripper has to be removed from the doffer bar. An exchange of the membrane is thereby associated with long downtime of the spinning machine. In addition, due to the frequent assembly and disassembly of the gripper on the doffer bar, unnecessary wear of the elastic gripping tab of the gripper occurs. As a result, a sufficient clamping action of the elastic retaining tab is not ensured in the locking groove on the doffer bar. The invention now has the object to eliminate this drawback 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. Weiter hat es sich als vorteilhaft erwiesen, wenn das Sicherungselement die Aussen- wandung des Halteelements teilweise umschliesst bzw. teilweise an der Aussenwan- dung 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. Auch ist es von Vorteil, wenn das Sicherungselement über eine Schnappverbindung mit dem Befestigungselement verbunden ist. 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. The object is achieved according to the fact that the retaining element is held by a securing element on the fastening element. About the securing element, the retaining element is secured transversely to its longitudinal axis on the fastening element. In contrast to the gripper of the prior art, the fastening element and the holding element are separated from each other, ie, the fastening element and the holding element are two separate components. The gripper must therefore not be removed from the doffer beam to replace the clamping element. Rather, it is possible to leave the gripper on the doffer bar and to remove the holding element with the clamping element from the fastener by loosening the securing element. The worn clamping element can then be easily replaced with a new clamping element. The downtime of the spinning machine during the replacement of a clamping element is kept low. In addition, unnecessary wear of the elastic retaining tabs on the fastener is prevented. A sufficient clamping effect of the elastic retaining tabs on the doffer bar is guaranteed. Furthermore, it has proved to be advantageous if the securing element partially surrounds the outer wall of the retaining element or lies partially against the outer wall of the retaining element. This ensures that the retaining element is sufficiently held or positioned on the fastening element. In this case, the securing element forms, in addition to the fastening element, a part of the housing of the gripper. Advantageously, the securing element encloses between 180 ° -270 ° of the outer wall of the holding element. It is also advantageous if the securing element is connected via a snap connection with the fastening element. As a result, the securing element is easily separable from the fastening element and thus the retaining element with the clamping element can be removed quickly from the fastening element. The snap connection is designed such that the fastening element has elevations and the securing element recesses which surround the elevations. Conversely, it is also possible that the securing element has elevations and the fastening element recesses which surround the elevations.
Zudem ist es vorteilhaft, wenn das Klemmelement über einen ersten Teilbereich seines Umfangs über das Befestigungselement und über einen zweiten Teilbereich seines Um- fangs über das Sicherungselement wenigstens an einem seiner Enden in Richtung der Längsachse am Halteelement fixiert ist. 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 Befesti- gungselement 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. 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. In addition, it is advantageous if the clamping element is fixed over a first portion of its circumference via the fastening element and over a second portion of its circumference on 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 at the upper end of the holding element, over a first portion of its circumference on the fastening element and over a second portion of its circumference on the securing element in the direction the longitudinal axis of the holding element is fixed to the holding element. In contrast to the prior art thereby eliminating the two caps for the axial fixation of the clamping element on the holding element. In order to achieve a sufficient axial fixation of the clamping element on the holding element, it has also proven to be advantageous if the clamping element is fixed over 180 ° of the circumference of the clamping element on the fastening element and over 180 ° of the circumference of the clamping element on the securing element on the holding element. For better sealing of the clamping element relative to the holding element, it is also advantageous if at least at one end of the holding element between the clamping element and the fastening element, a sealing ring is arranged. The sealing ring is arranged either at the lower or at the upper end of the retaining element or at the lower and at the upper end of the retaining element. The sealing ring bears against the fastening element with a first end face and presses the clamping element against the retaining element with a second end face. It is also possible that the sealing ring rests with its outer circumference on the fastening element and presses with its inner circumference the clamping element against the retaining 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. 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 ver- laufend 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 has also proven to be advantageous if rounded elevations are arranged on the inner wall of the holding element, which extend over a length of the holding element. The length of the holding element in this case represents the dimension of the holding element in its longitudinal direction. The rounded ridges ensure that the clamping element does not adhere to the inner wall of the holding element. A safe replacement of the coil or bobbin is guaranteed. Advantageously, the elevations are formed semicircular. Further, it is 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 bearing surface for the securing element and ensures that the retaining element is held or positioned sufficiently on the securing element via the securing element. The rib is advantageously arranged circumferentially on the holding element. The rib encloses the holding element completely or a part of the circumference of the holding element, preferably between 90 ° -270 °. However, the rib can also be arranged extending in the longitudinal direction on the holding element. In this case, a plurality of spaced-apart ribs may 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 Befesti- gungselements 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. Hierbei hat es sich weiter als vorteilhaft erwiesen, wenn der Luftkanal an einer Aussen- fläche 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. Moreover, it is advantageous if the air duct is integrally connected to the retaining element and the fastening element has a receptacle for the air duct. The term "integral" means that the air duct is firmly integrated into the retaining element, ie the air duct is not separable from the retaining element, which has the advantage that the retaining element and the air duct can be manufactured in the form of a single injection-molded part The receptacle has for this purpose a slightly smaller dimension than the air channel The receptacle extends completely or partially over the length of the air channel In this case, it has also proven to be advantageous if the air duct has on an outer surface at least one annular shoulder which forms a sealing point between the air duct and the fastening element is made of an elastic plastic The heel is in one piece 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 heel is pressed against the fastener and seals the air duct with respect to the recording.
Schliesslich ist es von Vorteil, wenn in der Aufnahme zwischen dem Befestigungsele- ment 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. Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer in den Figuren dargestellten Ausführungsform. 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 with respect to 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 on its outer surface two spaced circumferentially extending ribs. Further features of the invention will become apparent from the following description of an embodiment shown in FIGS.
Es zeigen: Show it:
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, Fig.5 einen Querschnitt des Greifers nach Figur 3, 1 shows a perspective view of a gripper according to the prior art, FIG. 2 shows a longitudinal section of the gripper according to FIG. 1, FIG. 3 shows a perspective view of a gripper according to the invention, FIG. 4 shows a longitudinal section of the gripper according to FIG. 3, FIG Cross section of the gripper according to FIG. 3,
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 ange- ordnet sind, in Richtung einer Längsachse 10 am Halteelement 2 fixiert. Die beiden Verschlusskappen 7 sind dabei an das Halteelement 2 über eine Schnappverbindung angeklippst. 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 coil or bobbin tube 3 (Figure 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 portion of the introduced into the interior of the holding member 2 coil or bobbin tube 3 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 in the direction of a longitudinal axis 10 on the holding element 2 by means of two closure caps 7 or clamps, which are respectively arranged on the underside 8 and upper side 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 Doffer- balken, umfasst der Greifer 1 ein Befestigungselement 1 1 . Das Befestigungselement 1 1 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 1 1 angeordnetes Dichtungselement 13 abgedichtet. Das Befestigungselement 1 1 weist zudem ein zweites Dichtungselement 14 auf, das den Greifer 1 gegenüber einer Druckluftsignalleitung ab- dichtet, die sich ebenfalls in Längsrichtung am Dofferbalken erstreckt. Am Befestigungselement 1 1 sind zwei elastische Haltelaschen 15 angeordnet. Die elastischen Haltelaschen 15 sind mit ihrem ersten Ende 16 mit dem Befestigungselement 1 1 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 1 1 eingebetteten Stahlfeder 18 erhöht bzw. unterstützt. For fastening the gripper 1 to a doffer bar (not shown in FIGS. 1 and 2), the gripper 1 comprises a fastening element 11. The fastening element 1 1 is fixedly connected to the holding element 2 and includes an air channel 12 for the compressed air supply of the membrane 5. The air channel 12 is connected to a compressed air line, which extends in the longitudinal direction of the doffer beams. The air channel 12 is sealed off from the doffer beam via a first sealing element 13 arranged on the fastening element 11. The fastening element 1 1 also has a second sealing element 14, which seals the gripper 1 with respect to a compressed air signal line, which likewise extends in the longitudinal direction on the doffer bar. On the fastener 1 1 two elastic retaining tabs 15 are arranged. The elastic retaining tabs 15 are connected at their first end 16 to the fastening element 1 1. With its second free end 17 of the gripper 1 is disengaged and releasably attachable to the doffer beam. The holding or clamping action of the retaining tabs 15 is increased or supported by an embedded below the retaining tabs 15 in the fastener 1 1 steel spring 18.
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 coil or bobbin tube 3, the membrane 5 is acted upon via the air channel 12 with compressed air. The membrane 5 thereby separates from the inner wall 4 of the holding element 2 and detects the coil or bobbin tube 3 at its outer end region. The spool or bobbin tube 3 can then be transferred to a transport device or spindle, not shown. To release the coil or bobbin tube 3 in the holding element 2 again, the membrane 5 is relieved by removing the compressed air. Due to the alternating load and release of the membrane 5 in the holding element 2, and the friction of the membrane 5 on the coil or bobbin tube 3, the membrane 5 is worn after a certain period of operation. The wear manifests itself in that the membrane 5 is porous and has leaks. As a result, a safe change of the coil or bobbin tube 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 Doffer- balken nicht mehr sichergestellt. A major disadvantage of the gripper 1 shown in Fig.1 and Fig.2 is that the exchange of a worn membrane 5 against a new membrane 5 designed as very expensive. In order to exchange a membrane 5, the gripper 1 must first be removed by the operating staff from the doffer bar. For this purpose, the elastic retaining tabs 15 are disengaged. The worn-out membrane 5 can then be separated from the retaining element 2 by loosening the closure caps 7 and against a new membrane 5 be replaced. The new membrane 5 is then fixed by the caps 7 again in the axial direction on the support member 2 and the gripper 1 clipped on the elastic retaining tabs 15 on the doffer beams. Due to the structure of the gripper 1, the replacement of a worn membrane 5 therefore designed as very complicated, since the entire gripper 1 must be removed from the doffer beams. An exchange of the membrane 5 is thereby associated with long downtime of the spinning machine. In addition, due to the frequent assembly and disassembly of the gripper 1 on the doffer bar, unnecessary wear of the elastic retaining tabs 15 occurs. As a result, a sufficient clamping effect of the elastic retaining tabs 15 on the doffer bar is no longer ensured.
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 darge- stellten Dofferbalken, umfasst der Greifer 1 ein Befestigungselement 1 1 . Am Befestigungselement 1 1 sind zwei elastische Haltelaschen 15 angeordnet, die mit ihrem ersten Ende 16 mit dem Befestigungselement 1 1 verbunden sind. Mit ihrem zweiten freien Ende 17 ist der Greifer 1 ausrastbar und lösbar am Dofferbalken anbringbar. Die Haltebzw. Klemmwirkung der Haltelaschen 15 wird von einer unterhalb der Haltelaschen 15 im Befestigungselement 1 1 eingebetteten Stahlfeder 18 erhöht bzw. unterstützt. 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 coil or bobbin tube 3 (Figure 4). The holding element 2 has an inner wall 4, on which a pneumatically adjustable clamping element 5 is arranged in the form of a membrane made of rubber. With the membrane 5, it is possible to detect the end portion of the introduced into the interior of the holding member 2 coil or bobbin tube 3 from the outside. The adjustment of the membrane 5 takes place in the direction of the double arrow 6 via a pneumatic device. For fastening the gripper 1 to a doffer bar (not shown), the gripper 1 comprises a fastening element 11. On the fastening element 1 1 two elastic retaining tabs 15 are arranged, which are connected at its first end 16 with the fastening element 1 1. With its second free end 17 of the gripper 1 is disengaged and releasably attachable to the doffer beam. The Haltebzw. Clamping action of the retaining tabs 15 is increased or supported by a below the retaining tabs 15 in the fastener 1 1 embedded steel spring 18.
Im Unterschied zum bekannten Greifer 1 aus Fig.1 und Fig.2 ist das Halteelement 2 über ein Sicherungselement 19 am Befestigungselement 1 1 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 1 1 ein Teil des Gehäuses des Greifers 1 dar. Über das Sicherungselement 19 ist das Halteelement 2 quer zu sei- ner Längsachse 10 am Befestigungselement 1 1 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 1 1 gehalten bzw. positioniert ist. Wie aus Fig.5 hervorgeht, ist das Sicherungselement 19 mit dem Befestigungselement 1 1 lösbar über eine Schnappverbindung verbunden. Die Schnappverbindung ist dabei derart ausgebildet, dass das Befestigungselement 1 1 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 of Figure 1 and Figure 2, the holding element 2 is held by a securing element 19 on the fastening element 1 1. The securing element 19 encloses in this case 180 ° of the outer wall 20 of the holding element 2, or lies over 180 ° on the outer wall 20 of the holding element 2 (Figure 5). The securing element 19 thus constitutes, in addition to the fastening element 1 1, a part of the housing of the gripper 1. The securing element 19 is provided with the retaining element 2 transversely to its side. ner longitudinal axis 10 secured to the fastener 1 1. On the outer wall 20 of the retaining element 2, a rib 21 is arranged over the entire circumference of the retaining element 2. The rib 21 serves as a support surface for the securing element 19 and ensures that the holding element 2 is held or positioned on the securing element 19 sufficiently on the fastening element 1 1. As is apparent from Figure 5, the securing element 19 is releasably connected to the fastening element 1 1 via a snap connection. The snap connection is designed such that the fastening element 1 1 elevations 22 and the securing element 19 tabs 23 having recesses 24 which enclose the elevations 22 and in which the elevations 22 engage.
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 1 1 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 1 1 und dem Sicherungselement 19 ein Dichtungsring 25 angeordnet. Der Dichtungsring 25 liegt mit einer ersten Stirnfläche 26 am Befestigungselement 1 1 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 Hal- teelements 2 erstrecken (Fig.5). The membrane 5 is both at a lower end 8 as well as at an upper end 9 of the support member 2 over 180 ° of the circumference of the membrane 5 via the fastener 1 1 and over 180 ° of the circumference of the membrane 5 via the securing element 19 in the axial direction Holding element 2 fixed. In contrast to the prior art thereby eliminating the two caps 7 and clamps for axial fixation of the diaphragm 5 on the holding element 2. For better sealing of the membrane 5 relative to the holding element 2 is at the lower end 8 and at the upper end 9 of the holding element 2 between the diaphragm 5 and the fastening element 1 1 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 presses with a second end face 27 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 are provided with semicircular elevations 28 which extend over the length of the holding element 2 (Figure 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 8 mm des Luftkanals 12 und ist aus einem elastischen Kunststoff. Der Absatz 31 ist einstückig mit dem Luftkanal 12 verbunden. Das Befestigungselement 1 1 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 1 1 verbunden. Wird die Membran 5 mit Druckluft beaufschlagt, dehnt sich der Luftkanal 12 in ra- 5 dialer Richtung in der Aufnahme 33 aus. Hierdurch wird der Absatz 31 gegen das Befestigungselement 1 1 gedrückt und dichtet den Luftkanal 12 gegenüber dem Befestigungselement 1 1 ab. The holding element 2 is also provided with an air channel 12. The air channel 12 is fixedly connected to the outer wall 20 of the retaining element 2, that is, the retaining element 2 and the air channel 12 are integrally formed. On its outer surface 30, the air channel 12 has an annular shoulder 31. The shoulder 31 extends over a length 32 of 8 mm of the air channel 12 and is made of an elastic plastic. The shoulder 31 is integrally connected to the air channel 12. The fastening element 1 1 has a receptacle 33 for the air channel 12. The receptacle 33 is cylindrical and extends over the length of the air channel 12. The holding element 2 is connected via the shoulder 31 of the air channel 12 loosely connected to the fastening element 1 1. If the membrane 5 is acted upon by compressed air, the air channel 12 expands in the direction 5 dialer direction in the receptacle 33. As a result, the shoulder 31 is pressed against the fastening element 1 1 and seals the air channel 12 relative to the fastening element 1 1.
Zwischen dem Befestigungselement 1 1 und dem Luftkanal 12 ist ein zusätzliches Diehl o tungselement 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 ge- 15 genüber der Druckluftleitung am Dofferbalken ab. Zur besseren Abdichtung weist das Dichtungselement 13 an seinem Umfang zwei beabstandete Rippen 37 auf. Am Befestigungselement 1 1 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 20 Abdichtung an seinem Umfang zwei beabstandete Rippen 37 auf. Between the fastening element 1 1 and the air channel 12, an additional Diehl o processing element 13 is arranged. The air duct 12 is connected via the sealing element 13 with a compressed air line which extends in the longitudinal direction of the doffer bar. The sealing member 13 is formed as a sleeve of rubber. With a first end 35, the sealing element 13 bears against the annular shoulder 31 of the air channel 12. With a second end 36, the sealing element 13 seals the air duct 12 against the compressed air line on the doffer bar. For better sealing, the sealing element 13 has at its periphery two spaced ribs 37. On the fastening element 1 1, a further sealing element 14 is also arranged, which seals the gripper 1 against a compressed air signal line, which also extends in the longitudinal direction of the doffer bar. 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 dasIn contrast to the known gripper, the gripper 1 according to the invention does not have to be removed from the doffer bar as a whole to replace a membrane 5. Rather, it is possible to leave the gripper 1 on the doffer bar and the
25 Halteelement 2 vom Befestigungselement 1 1 zu entfernen. Hierzu wird das Sicherungselement 19 vom Befestigungselement 1 1 gelöst. Das Halteelement 2 kann dann vom Befestigungselement 1 1 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. Zudem25 retaining element 2 to remove from the fastener 1 1. For this purpose, the securing element 19 is released from the fastening element 1 1. The holding element 2 can then be separated from the fastening element 11 and the worn-out membrane 5 can be exchanged for a new membrane 5. The downtime of the spinning machine during the replacement of a membrane 5 is kept low. moreover
30 wird eine unnötige Abnutzung der elastischen Haltelaschen 15 am Befestigungselement 1 1 verhindert, da lediglich das Halteelement 2 vom Greifer 1 entfernt werden muss. Ei- ne ausreichende Klemmwirkung der elastischen Haltelaschen 15 am Dofferbalken ist damit gewährleistet. 30, an unnecessary wear of the elastic retaining tabs 15 on the fastening element 1 1 is prevented, since only the retaining element 2 must be removed from the gripper 1. Egg- ne sufficient clamping action of the elastic retaining tabs 15 on the doffer bar is guaranteed.

Claims

Patentansprüche claims
1 . Greifer (1 ) zum Greifen einer Spule oder Spulenhülse (3), mit einem Befestigungselement (1 1 ) und einem zylindrischen Halteelement (2) mit einer Längsachse (10), wobei das Halteelement (2) eine Innenwandung (4) und eine Aussenwandung (20) aufweist, und an der Innenwandung (4) ein pneumatisch betätigbares Klemmelement (5) angeordnet ist, welches über einen Luftkanal (12) mit Druckluft beaufschlagbar ist, und das Halteelement (2) über ein Sicherungselement (19) am Befestigungselement (1 1 ) gehalten ist dadurch gekennzeichnet, dass das Sicherungs- element (19) die Aussenwandung (20) des Halteelements (2) teilweise umschliesst. 1 . Gripper (1) for gripping a coil or bobbin tube (3), with a fastening element (1 1) and a cylindrical holding element (2) with a longitudinal axis (10), wherein the holding element (2) has an inner wall (4) and an outer wall ( 20), and on the inner wall (4) a pneumatically actuable clamping element (5) is arranged, which is acted upon via an air channel (12) with compressed air, and the holding element (2) via a securing element (19) on the fastening element (1 ) is characterized in that the securing element (19) partially encloses the outer wall (20) of the retaining element (2).
2. Greifer nach Anspruch 1 dadurch gekennzeichnet, dass das Sicherungselement (19) über eine Schnappverbindung mit dem Befestigungselement (1 1 ) verbunden ist. 2. Gripper according to claim 1, characterized in that the securing element (19) via a snap connection with the fastening element (1 1) is connected.
3. Greifer nach Anspruch 1 oder 2 dadurch gekennzeichnet, dass das Klemmelement (5) über einen ersten Teilbereich seines Umfangs über das Befestigungselement (1 1 ) und über einen zweiten Teilbereich seines Umfangs über das Sicherungselement (19) wenigstens an einem seiner Enden in Richtung der Längsachse (10) am Halteelement (2) fixiert ist. 3. Gripper according to claim 1 or 2, characterized in that the clamping element (5) over a first portion of its circumference on the fastener (1 1) and over a second portion of its circumference on the securing element (19) at least at one of its ends in the direction the longitudinal axis (10) on the holding element (2) is fixed.
4. Greifer nach Anspruch 3 dadurch gekennzeichnet, dass das Klemmelement (5) über 180° des Umfangs des Klemmelements (5) über das Befestigungselement (1 1 ) und über 180° des Umfangs des Klemmelements (5) über das Sicherungselement (19) wenigstens an einem seiner Enden in Richtung der Längsachse (10) am Halteelement (2) fixiert ist. 4. Gripper according to claim 3, characterized in that the clamping element (5) over 180 ° of the circumference of the clamping element (5) via the fastening element (1 1) and over 180 ° of the circumference of the clamping element (5) via the securing element (19) at least is fixed at one of its ends in the direction of the longitudinal axis (10) on the holding element (2).
5. Greifer nach einem der Ansprüche 1 bis 4 dadurch gekennzeichnet, dass wenigstens an einem Ende (8,9) des Halteelements (2) zwischen dem Klemmelement (5) und dem Befestigungselement (1 1 ) ein Dichtungsring (25) angeordnet ist. 5. Gripper according to one of claims 1 to 4, characterized in that at least at one end (8,9) of the holding element (2) between the clamping element (5) and the fastening element (1 1) a sealing ring (25) is arranged.
6. Greifer nach einem der Ansprüche 1 bis 5 dadurch gekennzeichnet, dass an der Innenwandung (4) des Halteelements (2) abgerundete Erhöhungen (28) angeordnet sind, welche sich über eine Länge (29) des Halteelements (2) erstrecken. 6. Gripper according to one of claims 1 to 5, characterized in that on the inner wall (4) of the holding element (2) rounded elevations (28) are arranged, which extend over a length (29) of the holding element (2).
7. Greifer nach einem der Ansprüche 1 bis 6 dadurch gekennzeichnet, dass an der Aussenwandung (20) des Halteelements (2) über wenigstens einen Teil des Um- fangs des Halteelements (2) wenigstens eine Rippe (21 ) angeordnet ist. 7. Gripper according to one of claims 1 to 6 characterized in that on the outer wall (20) of the holding element (2) over at least a part of the circumference of the holding element (2) at least one rib (21) is arranged.
8. Greifer nach einem der Ansprüche 1 bis 7 dadurch gekennzeichnet, dass der Luft- kanal (12) mit dem Halteelement (2) einstückig verbunden ist und das Befestigungselement (1 1 ) eine Aufnahme (33) für den Luftkanal (12) aufweist. 8. Gripper according to one of claims 1 to 7, characterized in that the air duct (12) with the holding element (2) is integrally connected and the fastening element (1 1) has a receptacle (33) for the air duct (12).
9. Greifer nach Anspruch 8 dadurch gekennzeichnet, dass der Luftkanal (12) an einer Aussenfläche (30) wenigstens einen ringförmigen Absatz (31 ) aufweist, welcher ei- ne Dichtstelle zwischen dem Luftkanal (12) und dem Befestigungselement (1 1 ) bildet. 9. Gripper according to claim 8, characterized in that the air channel (12) on an outer surface (30) has at least one annular shoulder (31) which forms a sealing point between the air channel (12) and the fastening element (1 1).
10. Greifer nach Anspruch 8 oder 9 dadurch gekennzeichnet, dass in der Aufnahme (33) zwischen dem Befestigungselement (1 1 ) und dem Luftkanal (12) ein zusätzli- ches Dichtungselement (13) angeordnet ist. 10. Gripper according to claim 8 or 9, characterized in that in the receptacle (33) between the fastening element (1 1) and the air channel (12) an additional sealing element (13) is arranged.
1 1 . Doffervorrichtung umfassend einen Dofferbalken mit zumindest einem Greifer (1 ) nach einem der Ansprüche 1 bis10. 1 1. Doffer device comprising a doffer beam with at least one gripper (1) according to one of claims 1 to 10.
12. Spinnmaschine mit einer Doffervorrichtung nach Anspruchl 1 . 12. spinning machine with a doffer device according to Anspruchl 1.
13. Halteelement (2) mit einem Luftkanal (12) für einen Greifer (1 ) nach Anspruch 8 oder 9. 13. Retaining element (2) with an air channel (12) for a gripper (1) according to claim 8 or 9.
EP15791038.1A 2014-11-03 2015-10-21 Doffer gripper having a split housing Active EP3215659B1 (en)

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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

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CN107074478A (en) 2017-08-18
CN107074478B (en) 2019-07-16
EP3215659B1 (en) 2021-03-17
CH710323A1 (en) 2016-05-13

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