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Publication numberEP0719604 A1
Publication typeApplication
Application numberEP19950830545
Publication date3 Jul 1996
Filing date29 Dec 1995
Priority date30 Dec 1994
Also published asDE69515112D1, DE69515112T2, EP0719604B1
Publication number1995830545, 95830545, 95830545.10, EP 0719604 A1, EP 0719604A1, EP-A1-0719604, EP0719604 A1, EP0719604A1, EP19950830545, EP95830545
InventorsHans Kunz
ApplicantOMD OFFICINA MECCANICA DOMASO S.p.A.
Export CitationBiBTeX, EndNote, RefMan
External Links: Espacenet, EP Register
Wire guide for bending and twisting machines with improved wire engagement means
EP 0719604 A1
Abstract
The present invention relates to a wire guide for bending and twisting machines, with improved wire engagement means (1), characterized in that the wire guide (3) comprises a wire guide body (2) which is rotatively supported and wire locking means (30) operating on the wire guide body (2) or immediately near an output wire guide body (2).
Images(3)
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Claims(5)
  1. A wire guide for wire bending and twisting machines, including improved wire engagement means, characterized in that said wire guide comprises a wire guide body, rotatively supported so as to rotate about an axis thereof, and wire locking means, operating on said wire guide body or immediately near said wire guide body.
  2. A wire guide according to Claim 1, characterized in that the wire guide body is adapted to rotate for a set angle and then return to a starting position thereof.
  3. A wire guide according to Claims 1 and 2, characterized in that said wire locking means are associated with the wire guide body.
  4. A wire guide according to one or more of the preceding claims, characterized in that said wire locking means comprises a cylinder operating on a locking lever engageable with the wire and counterurged by a return spring.
  5. A wire guide according to one or more of the preceding claims, characterized in that said wire locking means comprise conical blocks arranged at the wire inlet position in the wire guide body and adapted to be closed as a chuck.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    The present invention relates to a wire guide for bending and twisting machines, including improved wire engagement means.
  • [0002]
    As is known, in wire bending and twisting machines, in which the wire is driven along a path extending from a rear inlet of the machine to a front outlet thereof, it is necessary, in order to properly bend or wind the wire, to use wire processing tools mounted on a twisting bar of the machine or on bending tool supporting slides thereof.
  • [0003]
    In locating the slides about a wire outlet point, are frequently formed offset arrangements, which prevent the bending tools from properly engaging the wire, because of a lacking of space between the slides.
  • [0004]
    In such a case, it is necessary to provide special slides or very complex tools which contribute to greatly increase the production cost of the machine.
  • SUMMARY OF THE INVENTION
  • [0005]
    Accordingly, the aim of the present invention is to overcome the above mentioned problems, by providing a wire guide for wire bending and twisting machines, which is so designed and arranged to greatly simplify the construction of the machine.
  • [0006]
    Within the scope of the above mentioned aim, a main object of the present invention is to provide such a wire guide which, by causing the wire or the machine bars to advance and turn about an axis thereof, provides the possibility of easily performing all of the desired bends or curved patterns.
  • [0007]
    Yet another object of the present invention is to provide such a wire guide which is very reliable and safe in operation, can be easily made starting from easily available elements and materials, and which, moreover, is very competitive from a mere economic standpoint.
  • [0008]
    According to one aspect of the present invention, the above mentioned aim and objects, as well as yet other objects, which will become more apparent hereinafter, are achieved by a wire guide for wire bending and twisting machines, including improved wire engagement means, characterized in that said wire guide comprises a wire guide body, rotatively supported so as to rotate about an axis thereof, and wire locking means, operating on said wire guide body or immediately near said wire guide body.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0009]
    Further characteristics and advantages of the invention will become more apparent hereinafter from the following detailed disclosure of a preferred, though not exclusive, embodiment of a wire guide for wire bending and twisting machines, with improved wire engagement means, which is illustrated, by way of an indicative, but not limitative example, in the accompanying drawings, where:
    • Figure 1 is a schematic cross-sectional view illustrating the wire guide according to the present invention; and
    • Figure 2 is a cross-sectional view substantially taken along the line II-II of Figure 1.
  • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • [0010]
    With reference to the number references of the above mentioned figures, the wire guide for wire bending and twisting machines, with improved wire engagement means, according to the present invention, which has been generally indicated by the reference number 1, comprises a supporting element 2 for supporting a rotatable wire guide 3, which is arranged axially of the body 2.
  • [0011]
    To the body 2 is coupled a hardened head 4 of the rotatable output wire guide 3; the wire guide 3 is coupled to a supporting flange 10, which is also designed for rotating, on ball bearing 11.
  • [0012]
    On the extension of the rotatable wire guide 3 is provided a fixed wire guide 20, arranged at wire entraining or driving rollers 21.
  • [0013]
    The main feature of the invention is that, in a rotatable wire guide body 3, are provided wire locking means, which are directly coupled to said wire guide, or are supported immediately near the wire guide, so as to allow to properly lock the wire and to cause it to turn by exploiting the rotary movement of the rotatable wire guide.
  • [0014]
    In operation, as the wire locking means are actuated, the wire guide and wire will be caused to turn, whereas the driving rollers are opened.
  • [0015]
    As the locking means are disengaged, the wire driving rollers will be closed, and the wire guide will rotate about the wire.
  • [0016]
    The possibility of turning the wire for a set angle and to return again to the starting position, allows to greatly simplify the bending equipment and to reduce to a minimum the number of bending units included therein, in particular as the pieces to be made are of complex shape.
  • [0017]
    In this connection it should be apparent that the wire can be locked in several suitable manners; only by example, it is herein shown a locking assembly which comprises a locking cylinder 30, operating on a lever 31 pivoted at one end thereof, and counter-urged by a return spring 32, to cause the lever to return to an unlocking position.
  • [0018]
    In operation, after having locked the wire by operating the lever 31, it will be possible to turn the wire about the axis thereof, and, accordingly, to work by bending tools at a normal position.
  • [0019]
    If desired, it is also possible to use different locking systems such as, for example, conical blocks arranged at the inlet of the wire into the outlet wire guide, which will operate as a tool bearing mandrel, in order to clamp the wire.
  • [0020]
    In this connection it should be also apparent that, as already stated, the particular embodiment of the locking means can be subjected to any desired modifications.
  • [0021]
    From the above disclosure it should be apparent that the invention fully achieves the intended aim and objects.
  • [0022]
    In particular, it is pointed out that a wire guide has been provided which is very simple construction-wise, and is specifically designed for exploiting the rotatable wire guide body, in combination with wire locking means, to perform the desired rotary movement of the wire, which will simplify a lot of working operations.
  • [0023]
    The invention, as disclosed, is susceptible to several variations and modifications, all of which will come within the scope of the inventive idea.
  • [0024]
    Moreover, all of the details can be replaced by other technically equivalent elements.
  • [0025]
    In practicing the invention, the used materials, as well as the contingent size and shapes, can be any, depending on requirements.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
EP0258109A1 *31 Jul 19872 Mar 1988LATOUR & FILSMethod and apparatus for bending metallic wires
DE4229294C1 *2 Sep 199216 Dec 1993Wafios Maschinen WagnerWire-shaping machine esp. for mfr. of springs - has wire-clamping rollers turning in either direction together round the wire guide axis and intermittently and programme-controlled
FR2479039A1 * Title not available
US3821525 *16 Mar 197228 Jun 1974Conrac CorpMethod and apparatus for automatically compensated tube bending
US5170654 *4 Apr 199115 Dec 1992Anagnostopoulos Panagiotis AMethod for wire bending in three dimensions
Classifications
International ClassificationB21F1/00
Cooperative ClassificationB21F1/00, B21F1/008
European ClassificationB21F1/00H, B21F1/00
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