FR2582548A1 - Device for unwinding a metal wire from a wire coil (bundle) - Google Patents

Abstract

Device for unwinding a metal wire from a wire coil (bundle) of which the axis is arranged vertically on an uncoiling device, the said wire being guided on a roller arranged at the upper part of a portal structure fastened to the ground and including in the vicinity of its lower part a pulley for guiding wire. Above the upper return roller 7, provision is made for a controlled passage orifice 18 of which the cross section is such that it permits the passage of a knot formed by the wire 8 without detriment to the tightening of the knot, the said orifice 18 including a means 17 for detecting the passage of the knot actuating an alarm device or a device for stopping the machine for processing the wire. The invention is used in wire drawing for unwinding the wire.

Description

Wire reeling device from a wire ring
The present invention relates to a device for unwinding a metal wire from a wire ring.

 In the wire reeling devices currently known, means for detecting the passage of tangled or interlocking turns are used, commonly known as wire drawing nodes.

 These means for detecting the passage of knots comprise an orifice of reduced cross section or throttling through which the wire passes and which can possibly prevent the passage of a knot which triggers during its passage a control means stopping the operation of the instatlation, in particular a device with Limited displacement.

 This device with limited displacement causes, during the passage of a knot of thread, a blocking which causes a tightening of the knot then requiring a cutting of the thread to eliminate this knot and a connection of the thread by welding.

 This process leads to stops in the wire processing installation (wire drawing, cold rolling, notching, surface treatment) and, consequently, a reduction in production and disadvantages with regard to the removal of knots. It is also known to proceed to the vertical unwinding of a metal wire which allows an easier movement of the wire than the horizontal unwinding, owing to the fact that the trajectory of the wire is disturbed by the effect of gravity. The device according to the invention uses vertical reeling with a means for detecting the passage of knots which eliminates the drawbacks mentioned above.

 According to the invention, above the upper deflection roller, a controlled passage orifice is provided, the cross section of which is such that it allows the passage of a knot formed by the wire without worsening the tightening of the knot, said orifice comprising means for detecting passage of the node actuating an alarm device or stopping the wire processing machine.

 With the device according to the invention, when a node is detected, it suffices at the output of the detection means to uncross the interlaced turns without having to cut and weld the wire again. This device makes it possible to avoid the physical deterioration of the metai and it allows the restarting of the machine without risk of breakage.

 Furthermore, the device according to the invention makes it possible to use scrolling speeds higher than those used in known horizontal or vertical unwinding devices.

 We can therefore use a higher speed which is more related to the speed of modern wire processing machines.

Other characteristics and advantages of the invention will be better understood on reading the following description of an embodiment and with reference to the accompanying drawings, in which
- Figure 1 is a side elevational view of a wire unwinding device according to the invention;
- Figure 2 is a front elevational view of the device shown in Figure 1.

 In Figures 1 and 2, there is shown a device for unwinding a metal wire which comprises a base 1 on which are pivotally mounted about a horizontal axis 2 reels 3, 3a which receive a ring of wire 4 and which are arranged after loading along a substantially vertical axis to unwind the wire ring 4.

 Near the reels 3, 3a is fixed on the base 1 a gantry 5 supported by struts 6, said gantry being provided at its upper part with a rotating return roller 7 on which the wire 8 is guided at its exit from the reel.

At the lower part of the struts 6, is rotatably mounted on a support member 9 a pulley 10 for guiding the wire 8 towards the processing machine thereof, not shown in the drawing.

 The upper roller 7 is rotatably mounted on an axis capable of sliding vertically on the uprights of the gantry 5, said axis being integral with slides 11 guided on the uprights of the gantry S and connected by a chain 12 to a control geared motor 13. This arrangement allows to lower the roller 7 to thread the wire 8 and then to lift it to replace it for operation.

 Above the gantry 5 is mounted a cross 14 which is fixed to the gantry by uprights 15, 15a delimiting a passage orifice 18 whose section is such that it allows the passage of a thread knot without worsening the tightening of the knot.

On the cross-member 14 is suspended by chains 16, 16a, or any other corresponding means, a bar 17 which is connected to a means for closing a circuit for controlling the operation of the wire processing machine located downstream or d 'an alarm organ. When a thread knot passes between the roller 7 and the bar 17, it raises the latter which controls the circuit closure means mentioned above.

 The detection means can also consist of a barrage of photoelectric cells placed above the roller 7 and controlling the passage orifice 18 defined by the cross-member 14 and the uprights 15, 15a.

 It is also possible to use as detection means a magnetic field whose value is modified by the more or less significant passage of a knot, in particular of a more or less significant mass of tangled wire.

 Of course, the invention is not limiting and those skilled in the art may make modifications to it without departing from the scope of the invention.

Claims (5)

1. Device for unwinding a metal wire from a wire ring, the axis of which is arranged vertically on a reel, said wire being guided on a roller arranged at the top of a gantry fixed on the ground and comprising near its lower part a wire guide pulley, characterized in that, above the upper deflection roller (7), there is provided a controlled orifice (18) whose cross section is such that it allows the passage of a knot formed by the wire (8) without worsening the tightening of the knot, said orifice (comprising a detection means (17) for passage of the knot actuating an alarm or machine stop device wire processing. 2. Device according to claim 1, characterized in that the detection means consists of an elongated member (17) suspended freely above the upper deflection roller (7), said member (17) being connected to a means of closing of an electrical circuit for controlling the operation of the fit processing machine.  3. Device according to claim 1, characterized in that the detection means consists of a barrage of photoelectric cells arranged above the upper deflection roller (7) and controlling a passage orifice (18) located at above said roller. 4. Device according to claim 1, characterized in that the detection means consists of a magnetic field whose value is modified by the more or less significant passage of a node, in particular of a more or less significant mass of tangled thread. 5. Device according to claim 1, characterized in that the upper roller (7) is rotatably mounted on an axis which is itself mounted vertically sliding on the amounts of the gantry, said axis being connected to a control chain (12) actuated by a geared motor (13) allowing the return roller (7) to go up or down.