Metal deforming – By use of tool acting during relative rotation between tool... – With tool surface orbiting around axis parallel to direction...
Patent
1991-11-15
1992-11-10
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With tool surface orbiting around axis parallel to direction...
140140, B21F 102
Patent
active
051613999
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device for straightening a wire, particularly at the inlet of a metal working apparatus, comprising a frame to which are attached means for holding the wire, a rotor connected to continuous rotation drive means, said rotor having an axial conduit which is traversed longitudinally by the wire, a backward and forward drive means designed to produce relative longitudinal movement between the rotor and the wire, a movable central guide traversed by the wire and attached to the rotor so as to be transversely displaceable in relation to the axial conduit between a generally centered position and an eccentric position, means for controlling eccentric movement designed to displace the central guide by means of fluid pressure during rotor rotation, and stationary guides traversed by the wire and disposed in the axial conduit on either side of the central guide.
Metal working machines designed for manufacturing small pieces, especially for screw cutting, are usually supplied with material in the form of a wire reel which is unrolled to penetrate the machine longitudinally. However, preliminary straightening of the wire is necessary to ensure that the final product is satisfactory. Generally this is accomplished by a straightening device installed at the input of the machine and operating intermittently, each time the wire advances, in order to make a new piece. It should be noted that the term "wire" as used here may designate a metal element which may or may not be circular, is relatively rigid, and has transverse dimensions usually of the order of several millimeters and as large as approximately 10 to 12 mm.
The invention concerns a rotary type straightener in which the wire is disposed generally along the axle of a rotor usually having five guides, that is, one central guide which is transversely movable so as to deform the wire and two pairs of auxiliary stationary guides on either side of the central guide. Straightening is achieved in known manner by a combination of eccentric positioning of the central guide, rotation and relative displacement of the rotor in relation to the wire, or the reverse. These movements provoke inflection with spiral propagation in the wire, thereby deforming it beyond the elastic limit to the extent that it reverts to rectilinear form by elasticity. Naturally, the amplitude of eccentric displacement and the distance between guides must be adapted to the dimensions and mechanical characteristics of the various wires to be treated.
Known devices for applying this technique present a certain number of disadvantages from the point of view of construction and use. The need to progressively displace the central guide to an eccentric position in relation to the wire during the course of rotor displacement requires complicated mechanisms which are usually controlled by cams actuated by a cam shaft associated with the metal working apparatus. For this reason, the device is fairly cumbersome and the rotor, in particular, is much longer than the distance occupied by the guides because of the space necessary for the control mechanism between the two rotor bearings. Moreover, this mechanism is relatively complicated, with a large number of belts, levers, etc., therefore quite costly, and poses problems of equilibrium and play which affect its precision. In addition, current devices require precise adjustment of the stationary guides which can only be done when they are stopped, therefore, they take a rather long time to adjust.
Patent Application FR-A-2 312 314 (=DE-A-2 523 831) describes a stationary straightening device continuously traversed by the wire to be straightened and wherein eccentric positioning of the central guide is controlled by a bushing axially slidable on the rotor, said bushing having axially inclined surfaces in contact with a support on the central guide. This support slides radially when the bushing is radially displaced by a control mechanism. Application DE-A-2 707 970 describes a perfected embodiment of this device in which said drive
REFERENCES:
patent: 1847454 (1932-03-01), Webb
patent: 2172134 (1939-09-01), Wright
patent: 3277682 (1966-10-01), Kestner
Meier Peter
Piguet Pierre-Louis
Esco S.A.
Larson Lowell A.
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