FR2929144A1 - Rapidly and linearly driven threaded-like element cutting device for steel wire breaking and cutting device, has guiding units guiding wire between cutting disks, and determining unit determining length of wire to be cut - Google Patents

Abstract

The device has aligned cutting disks (1, 2) arranged in plan in quasi-tangency position and driven positively in rotation along inverse direction by a motor unit. Guiding units e.g. hollow shafts, guide a linearly driven threaded-like element (F) between the disks, and a determining unit determines a length of the linearly driven threaded-like element to be cut. The disks are driven synchronously in inverse direction by cylindrical pinions systems, where the cylindrical pinions systems are coupled to vertical spindles, respectively. The disks have blades (6, 7) fixed in a housing.

Description

The invention relates to the technical sector of thread-like cutting devices.

Advantageously, the invention finds an application in the case of machines for straightening and cutting a steel wire.

As a non-limitative indication and, in a manner perfectly known to a person skilled in the art, this type of machine comprises, on the same support frame, an assembly capable of providing linear drive and the training of the wire, and a suitable assembly. to ensure the cutting of the latter to a specific length.

At the cutting level as such, different solutions can be envisaged. For example, the cut is made by a shear which is located in a vertical plane, perpendicular to the direction of travel of the wire. In this case, it is necessary to stop the linear feed of the wire during cutting, which tends to reduce the rate of production. Or, to compensate for the feed of the wire, in the case of a linear and continuous drive of the wire, including during the cutting operation as such, it is necessary to perform, upstream of the cutting module, a loop, which requires making a machine of great length.

Also known cutting devices on the fly, as emerges, for example, the teaching of UK Patent 087069. The cut is performed by means of two rotating discs, arranged on either side of the wire, in being each equipped with a knife. The disks are positively rotated, one in one direction, the other in an opposite direction, thus making it possible to cut continuously, that is to say without having to stop the advance of the wire. . However, the means of implementation are of a real complexity, while the wire guide problem can appear at the level of the cutting discs. We also note the difficulty of cutting wires of different diameters.

The object of the invention is to remedy these disadvantages in a simple, safe, effective and rational manner.

The problem that the invention proposes to solve is to be able to cut on the fly at least one filiform element, with the possibility of continuously driving the wire, at relatively high linear speeds and with the aim of being able to modify the cut length at will and easily adapt the cut as such to different sections of the wire.

To solve such a problem, it has been designed and developed a device for cutting on the fly of at least one filamentary element driven linearly, characterized in that it comprises: - two aligned cutting discs, arranged opposite in the same plane in almost tangent position and positively rotated, in a synchronized manner and in the opposite direction, by a motor member and in synchronism with the linear advance of the filiform element; means for guiding the wire between the discs; means capable of determining the length to be cut.

To solve the problem of ensuring the cutting of the wire as its linear advance, each disc has a knife fixed in a housing, so that the cutting edge protrudes from the periphery of the disc, the knives being , before cutting, angularly offset, at two equal angles considered on the same side of the alignment of the two diameters of the disks, to be arranged parallel, after driving the disks, corresponding to the cutting operation as such.

To solve the problem of adapting the section to the different sections of the filiform element, the periphery of each disk and the leading and cutting face of the knives, have a groove substantially corresponding to the section of the filiform element. The disks and / or knives are interchangeable.

In an advantageous embodiment, the discs are synchronously driven by a pinion system, one of which is coupled to a motor shaft.

To solve the problem of detecting the desired cutting length so as to trigger, concomitantly, the cut as such, or the means capable of determining the length to be cut, are constituted by means for measuring the speed of cut. wire feed, or the means able to determine the length to cut, are constituted by an adjustable stop secured to a trigger member of the drive motor disks.

In one embodiment, the elements for measuring the speed of advance of the filiform element are constituted by an encoder wheel independent of the linear drive means of the disks. The encoder wheel is arranged opposite and in alignment, in the same plane, a guide roller for the passage of the filiform element in alignment with the cutting discs. The encoder wheel and its guide roller are arranged upstream of the cutting discs.

The invention is described below in more detail with the help of the figures of the accompanying drawings in which: - Figure 1 is a purely schematic view showing the principle at the base of the cutting device according to the invention; FIG. 2 is a perspective view of the cutting device according to the invention; - Figure 3 is another perspective view of the cutting device showing, in particular, a technical solution for driving the cutting discs; FIG. 4 is a perspective view of the detection module of the speed measurement of the advance of the wire; FIGS. 5 to 7 are plan views of the device showing the essential phases of the cut, in particular the positioning of the knives with respect to the thread, namely: FIG. 5, before cutting FIG. 6, during the cut FIG. 7, after the cut. As indicated, the cutting device, according to the invention, is of the on-the-fly type, being shaped to ensure the continuous cutting of a filiform element (F), according to determined lengths.

It is recalled that the invention applies to the cutting of all types of filiform elements, whatever their section and their materials. In the remainder of the description, it is considered, by way of example, a wire (F).

According to the invention, the device implements two identical disks (1) and (2) positively rotated, synchronously and in the opposite direction. The two cutting discs (1) and (2) are aligned and arranged in the same plane, substantially in a tangent position. For example, the two disks (1) and (2) are arranged in a horizontal plane resulting from a support frame (3). The wire (F), consisting of any filamentary element, is engaged between the two discs (1) and (2), being guided at the inlet and the outlet of said discs by guide means (4) and (5). ) in the form of sleeves, for example.

The wire (F) is driven linearly and continuously by any known and appropriate means.

Each disk (1) and (2) has a housing in the form, for example, of a square clearance (la) and (2a) for fixing, in a removable manner, a knife (6) and (7) ). The cutting edges (6a) and (7a) of each knife (6) and (7), protrude from the periphery of the discs (1) and (2) to cut the iron (F), as will be indicated in following the description.

Importantly, the leading face of the cutting edges (6a) and (7b) of the knives (6) and (7), as well as the periphery (Ib) and (2b) of the disks (1) and ( 2), have a groove substantially corresponding to the section of the wire (F).

Note that the grooves (6a) and (7a) knives (6) and (7) correspond best to the section of the wire to ensure perfect guidance of the latter at the time of cutting, while the grooves (lb) and (2b) discs (1) and (2) may be of greater depth. Indeed, for different diameters of wire (F) to cut, it is sufficient to change the knives (6) and (7), the discs (1) and (2) can be retained because likely to accept several diameters of wire.

The synchronism drive of the disks (1) and (2) and in the opposite direction, is performed by a system of cylindrical gears (8) and (9) ratio 1/1. The pinions (8) and (9) are, respectively, in the example illustrated, coupled to a vertical shaft (10) and (11) at the end of which are also coupled the cutting discs (1) and (2). The shaft (10) constitutes the drive shaft being slaved to a motor (12) of any known and appropriate type. In this embodiment, the shaft (11) is free to rotate. The pinions (8) and (9) with the shafts (10) and (11) and the motor (12) are mounted in appropriate arrangements of the support frame (3), so as to constitute an independent compact assembly.

The motor (12) is subject to a control electronics to be driven when the previously determined cutting length is reached, and stopped when said cut is made. In the example illustrated, the means capable of determining the length to be cut are constituted by means for measuring the speed of advance of the wire. These elements for measuring the feed speed of the wire are constituted by a coding wheel (13) of any known and appropriate type, and independent of the drive means of the cutting discs (1) and (2). Next to the coding wheel (13) and in alignment, in the same plane, namely the same horizontal plane as that receiving the cutting disks (1) and (2), is mounted a guide roller (14) for the passage of the wire (F). Of course, the encoder wheel (13) and its guide roller (14) are arranged in alignment with the cutting discs (1) and (2) and upstream thereof.

Without departing from the scope of the invention, other means may be provided to detect the length of the wire to be cut. For example, these means may be constituted by an adjustable stop secured to a trigger member for feeding the motor (12) driving the cutting discs (1) and (2), in the same manner as with the encoder wheel (13). This stop is disposed downstream of the cutting discs.

The operation of the cutting device according to the invention is more particularly illustrated in FIGS. 4 to 6. The wire (F) is driven linearly by any known and appropriate means.

FIG. 4 shows the positioning of the cutting discs (1) and (2) and, consequently, of the knives (6) and (7), before the cutting operation as such, in other words during the advance wire (F) and before detecting the length of cut. In this position, the knives (6) and (7) are angularly offset at two equal angles (a) considered on the same side of the alignment of the two diameters (D1) and (D2). As an indication, this angle (a) is between 20 and 30 ° and is advantageously 22 °.

When the length of cut is detected, the motor (12) is fed and the cutting discs (1) and (2) rotated in the opposite direction, according to the arrows (F1) and (F2). The cut as such is performed when the two knives (6) and (7), under the effect of driving the disks (1) and (2) are arranged parallel, in a contiguous manner (Figure 5).

When the cut is complete, the two discs (1) and (2) are stopped. The knives (6) and (7) are then positioned at an angle (13) equal to and adjacent to the angle (a) corresponding, as indicated, to the positioning of said knives, before the attack of the cut.

Note that the disks (1) and (2) can be stopped in the position shown in Figure 6 or, optionally, in the position shown in Figure 4.

Importantly, the cutting discs (1) and (2) are synchronized with the linear feed of the wire (F) when the knives (6) and (7) are engaged corresponding substantially to the sum of the two angles (at). The length of cut iron, under for example the effect of inertia, is released from the guide (5), after being received in any store in the form, for example, of a chute.

As indicated, the cutting device according to the invention finds a particularly advantageous application in the case of a machine for straightening and cutting steel wires. In a manner that is well known to a person skilled in the art, this type of machine essentially comprises a drive and wire dressing module disposed upstream of the cutting device. Downstream of the cutting device, the machine can have any type of arrangement for receiving the cut son to the desired length. Generally, the wire is packaged in a coil arranged upstream of the drive and dressing module. Importantly, in order to initialize the cut, the cutting device can be movable in translation to be moved coaxially to the wire, in the sense of opposed to its advance, in order to perform a so-called shutdown, that is to say when the wire is not driven. The advantages are apparent from the description.

Claims (2)

CLAIMS 1- Device for cutting on the fly of at least one filamentary element driven linearly, characterized in that it comprises: - two aligned cutting discs (1) and (2), arranged facing in the same plane in quasi-tangent position and positively rotated, in the opposite direction, by a motor member (12) and in synchronism with the linear advance of the filiform element; - Guide means (4) and (5) of the wire between the discs (1) and (2); means capable of determining the length to be cut. - 2- Device according to claim 1, characterized in that each disc (1) and (2) has a knife (6) and (7) fixed in a housing, so that the cutting edge protrudes from the periphery of the disc , the knives (6) and (7) being, before cutting, angularly offset, at two equal angles considered on the same side of the alignment of the two diameters of the disks (1) and (2) to be arranged parallel after driving the discs, corresponding to the cutting operation as such. -3- Device according to claims 1 and 2, characterized in that the periphery of each disc (1) and (2) and the leading and cutting face of the knives (6) and (7) have a corresponding groove substantially to the section of the filiform element. -4- Device according to claims 1 to 3, characterized in that the discs (1) and (2) and / or the knives (6) and (7) are interchangeable.- 5- Device according to claims 1 to 4, characterized in that the discs (1) and (2) are synchronously driven by a gear system, one of which is coupled to a motor shaft. -6- Device according to claim 1, characterized in that the means for determining the length to be cut, are constituted by the yarn speed measuring members. - 7- Device according to claim 1, characterized in that the means for determining the length to cut, are constituted by an adjustable stop secured to a trigger member for driving the discs. - 8- Device according to claim 6, characterized in that the members for measuring the speed of advance of the filiform element are constituted by a coding wheel (13) independent of the linear drive means of the disks. Apparatus according to claim 8, characterized in that the encoder wheel is arranged facing and in alignment, in the same plane, a guide roller (14) for the passage of the filiform element in alignment with the cutting discs. - 10- Device according to claims 8 and 9, characterized in that the encoder wheel and its guide roller are arranged upstream of the cutting discs (1) and (2) .- 11- Device according to claim 1, characterized in the guide means of the filiform element consist of sleeves arranged on both sides of the cutting discs, at the inlet and the outlet of the latter. Use of the device according to any one of claims 1 to 11 in a machine for straightening and cutting a steel wire.