FR2862242A1 - Elongated unit e.g. cylindrical tube, cutting apparatus, has two connection units connecting cutter-head with two rings, respectively, and shaft connected to control jack to stop rotation of one ring - Google Patents

Abstract

The apparatus has two rings (9,11) mounted concentrically along a longitudinal axis (3). A pinion (19) rotates the ring (9), and two connection units (23,24) connect a cutter-head (22) with the two rings, respectively. A shaft (39) is connected to a control jack (40) to stop the rotation of the ring (11). The connection unit (23) has an orifice (31) permitting variation of angular position between the rings. The cutter head is displaced towards the longitudinal axis and is moved away from the axis, when the ring (9) is rotated in respective directions under the effect of the shaft and jack to circumferentially cut an elongated unit placed along the axis.

Description

Apparatus for cutting an elongate member such as a cylindrical tube

  The present invention relates to an apparatus for cutting or sectioning an elongate object such as a cylindrical tube.

  Currently, to cut or section a cylindrical tube, especially at the exit of a continuous extruder, using a circular saw. The use of such a tool on the one hand requires a rather complicated apparatus associated with security systems and on the other hand causes the formation of significant burrs that should be eliminated by performing a recovery at both ends of the portions of cut tubes.

  The present invention aims to provide a simpler and more efficient device.

  The apparatus for cutting or sectioning an elongate element such as a cylindrical tube according to the invention comprises first and second rings concentrically mounted along a main longitudinal axis, means for rotating said first ring, a tool holder carrying a cutting tool, first connecting means for connecting the tool holder to the first ring pivotally along a first secondary longitudinal axis decentered with respect to said longitudinal main axis, second connecting means for connecting the tool holder to the second ring of in a pivoting manner along a second secondary longitudinal axis that is off-center with respect to said main axis and angularly offset relative to said first secondary longitudinal axis.

  The apparatus according to the invention further comprises braking means for braking the rotation of said second ring, at least one of said connecting means comprising relative displacement means allowing a variation of angular position between the first ring and the second ring. second ring at the same time as a radial position variation of the tool holder.

  Thus, when said first ring is rotated in one direction, said tool moves towards said longitudinal main axis under the effect of said feeder means for circumferentially cutting an elongated member substantially located along said main axis, and when said first ring is driven in rotation in the other direction, said tool moves away from said longitudinal main axis under the effect of said feeder means.

  According to the present invention, said relative displacement means preferably comprise stroke limiting means for limiting the angular stroke of said first ring relative to said second ring between two extreme angular positions corresponding to two extreme radial positions of said tool.

  According to the present invention, said first connecting means preferably comprise a longitudinal pivot carried by the second ring and extending in an oblong orifice of the tool holder and said second connecting means preferably comprise a longitudinal pivot carried by the first ring. and extending into a circular hole of the tool holder.

  According to the present invention, said second ring is preferably rotatably mounted around at least a portion of said first ring.

  According to the present invention, said tool holder is preferably mounted frontally on said rings.

  According to the present invention, said first and second rings preferably have front faces extending in a radial plane, said tool holder extending in front of these end faces.

  According to the present invention, said connecting means are placed on either side of said tool.

  According to the present invention, said tool holder is preferably constituted by a ring or a portion of a ring.

  According to the present invention, said tool comprises a cutting blade fixed frontally on said tool holder, whose cutting edge extends in a radial plane.

  According to the present invention, the apparatus preferably comprises annular guide means for longitudinally guiding the element to be cut.

  According to the present invention, said apparatus preferably comprises a radially extending plate-shaped support, in which is provided an annular recess for receiving said rings and which carries a motor connected to said first ring in order to drive it in rotation, said tool holder being placed outside said recess.

  According to the present invention, said support preferably has a through passage through which the cutting or cutting element can be engaged and preferably carries an actuating cylinder of a braking shoe acting on said second ring. better understood in the study of an apparatus for cutting or sectioning a cylindrical tube, described by way of non-limiting example and illustrated by the drawing in which: Figure 1 shows a longitudinal section of a cutting apparatus according to the present invention, according to angularly offset cutting planes; - Figure 2 shows a front view of the apparatus of Figure 1, in an extreme position; - And Figure 3 shows a front view of the apparatus of Figure 1, in another extreme position.

  The cutting apparatus 1 shown in the figures comprises a plate-shaped support 2 which extends radially to a longitudinal main axis 3 and which shows a cylindrical through-passage 4 concentric with the main axis 3.

  The support 2 has, frontally, an annular recess 5 for forming, between the central passage 4 and the annular recess 5, an annular portion 6 facing forward.

  The support 2 has, at the rear, a circular recess 7 made along a longitudinal axis 8 parallel to the main axis 3 and communicating radially with the front recess 5.

  The apparatus 1 comprises, concentrically with the main axis 3 and in the frontal recess 5, a first ring 9 rotatably mounted on the annular portion 6 of the support 2 by means of a ball bearing 10 and a second ring 1l mounted on the first ring 9.

  The first ring 9 comprises a front annular portion 12 and a rear annular portion 13 fixed together by longitudinal screws 14 and forming between them an annular groove 15 in which an inner annular shoulder 16 of the second ring 11 is engaged so that the second ring 11 is rotatably mounted on the first ring 9 and is maintained.

  The first ring 9 and the second ring 11 having end faces 17 and 18 extending substantially in the same radial plane, in front of the front face 21a of the support 2.

  The rear portion 13 of the ring 9 has an external toothing engaged with a pinion 19 installed in the rear recess 7 of the support 2 and carried by the end of the output shaft of an electric motor 20 fixed on the face back 21b of the support 2.

  The apparatus 2 further comprises a tool holder 22 consisting of a circumferential portion of a flat ring, for example substantially a half ring, which is mounted frontally to the end faces 17 and 18 of the first ring 9 and the second ring. 11 and a circumferential end of which is connected to the first ring 9 by means of connecting means 23 and its other circumferential end is connected to the second ring 11 by means of connecting means 24.

  The connecting means 24 comprise a longitudinal pivot 25, such as a screw, fixed in a hole 26 of the second ring 11 and which traverses with a slight clearance a circular orifice 27 of the tool holder 22, this pivot 27 having a head 28 of longitudinal retention of the tool holder 22.

  The connecting means 23 comprise a longitudinal pivot 29 which is fixed in a hole 30 of the front portion 12 of the first ring 9 and which passes through an orifice 31 of the tool holder 22, this pivot 29 having a head 32 extending in front of the tool holder 22.

  The orifices 27 and 31 are formed substantially diametrically opposite through the tool holder 22 and the orifice 31 has an oblong shape substantially radially, so as to form stops as will be described later.

  The tool holder 22 carries, on the middle portion of its end face, substantially between the connecting means 23 and 24 a tool 33 which is constituted by a blade which extends radially and protrudes from the side of the main axis and which is fixed for example by screw 34. On the side of the main axis 3, this blade 33 has a sharp straight edge 35 placed on the side of the main axis 3 and extending in a radial plane.

  The support 2 carries, in its through passage 4, an annular guide 36 through which can pass a longitudinal tube 37 to cut or section.

  The support 2 has a radial channel 38 which opens into its annular recess 5 opposite the periphery of the second ring 11 and in which is installed a rod 39 connected to a cylinder 40 for controlling and controlling the radial movements of the rod 39 .

  A braking pad 40 is installed between the rod 39 and the periphery of the second ring 11.

  The apparatus 1 which has just been described operates in the following manner.

  When the first ring 9 and the second ring 11 rotate relative to each other, in one direction or the other, the tool holder 22 moves radially so that the edge 35 of the blade cut 33 moves on a radial stroke away from or near the main axis 3.

  This result is achieved by the fact that the relative angular position of the pivot 25 and the pivot 29 varies in one direction or the other, these pivots 25 and 29 cooperating with the walls of the orifice 27 and the orifice 31.

  At the same time, the pivot 25, while rotating in the orifice 31, moves longitudinally in the latter. The ends of the oblong orifice 31 constitute limit stops which determine an extruded position visible in FIG. 2 and an extreme close position visible in FIG. 3.

  In the example, the angle between the pivots 25 and 29 having for center the main axis 3 and passes from acute to optu.

  The stops mentioned above determined by the oblong hole 31 of the tool holder 22 are placed so that the wall of a tube 37 which would be engaged through the guide 36 is on the path of the cutting edge 35 of the cutting blade 33.

  To cut a tube 37 placed through the guide 36, the procedure is as follows.

  From the extreme extended position shown in FIG. 2, the motor 20 is actuated so as to rotate the first ring 9 in one direction and at the same time actuator 40 is actuated so as to brake the second ring 11 under the effect of braking pad 41.

  This causes the tool holder 22 to move radially inwards by virtue of the angular position variation of the ring 9 with respect to the ring 11, so that the cutting edge 35 of the cutting blade 33 moves until reaching the periphery of the longitudinal tube 37 and turns around.

  The cutting edge 35 penetrates into the wall of the tube 37 in the direction of the main axis 3 to make a circular cut 37a until sectioning the tube 37. The tool holder 22 then reaches the extreme close position shown in Figure 3 .

  The cutting force is determined by the effect of the braking of the second ring 11 transmitted to the blade 33 via the pivots 25 and 29 and the tool holder 22.

  If now the motor 20 is actuated so as to rotate the first ring 9 in the other direction, it causes a reverse radial movement of the tool holder 22 and consequently of the cutting blade 33 to its extreme position spread also under the effect of the braking caused by the braking pad 41 actuated by the jack 40.

  The radial stroke of the cutting tool 33 may be such that the apparatus 1 is capable of cutting or cutting tubes 37 of different diameters. Each time, it is preferable to change the annular guide 36 in order to adapt its through passage to the diameter of the tube to be cut.

  The present invention is not limited to the example described above. Many alternative embodiments are possible without departing from the scope defined by the appended claims.

Claims (11)

  Apparatus for cutting or sectioning an elongated element such as a cylindrical tube, characterized in that it comprises first and second rings (9, 11) concentrically mounted along a main longitudinal axis, means (19) for driving in rotation said first ring, a tool holder (22) carrying a cutting tool, first connecting means (23) for connecting the tool holder to the first ring pivotally in a first longitudinal axis secondary off-center with respect to said longitudinal main axis, second connecting means (23) for connecting the tool holder to the second ring pivotally along a second secondary longitudinal axis decentered with respect to said main axis and angularly offset from said first longitudinal secondary axis, and braking means (41) for braking the rotation of said second ring, at least one of said connecting means comprising relative displacement means (31) pe providing a variation of angular position between the first ring and the second ring at the same time as a radial position variation of the tool holder, so that when said first ring is rotated in one direction, said tool moves towards said longitudinal main axis under the effect of said braking means for circumferentially cutting an elongated element placed substantially along said main axis, and when said first ring is rotated in the other direction, said tool moves away from said main axis longitudinal under the effect of said feeder means.   2. Apparatus according to claim 1, characterized in that said relative displacement means comprise stroke limiting means (31) for limiting the angular stroke of said first ring relative to said second ring between two extreme angular positions corresponding to two extreme radial positions of said tool.   2862242 9 3. Apparatus according to one of claims 1 and 2, characterized in that said first connecting means comprise a longitudinal pivot (29) carried by the second ring and extending into an oblong hole (31) of the tool holder and said second connecting means comprises a longitudinal pivot (25) carried by the first ring and extending into a circular orifice (27) of the tool holder.   4. Apparatus according to any one of the preceding claims, characterized in that said second ring (11) is rotatably mounted around at least a portion of said first ring (9).   5. Apparatus according to any one of the preceding claims, characterized in that said tool holder (22) is mounted frontally on said rings.   6. Apparatus according to any one of the preceding claims, characterized in that said first and second rings have end faces (17, 18) extending in a radial plane, said tool holder extending in front of these end faces. .   7. Apparatus according to any one of the preceding claims, characterized in that said connecting means (23, 24) are placed on either side of said tool (33).   8. Apparatus according to any one of the preceding claims, characterized in that the tool holder (22) is constituted by a ring or a ring portion.   9. Apparatus according to any one of the preceding claims, characterized in that said tool comprises a cutting blade (33) fixed frontally to said tool holder, whose cutting edge (35) extends in a radial plane.   10. Apparatus according to any one of the preceding claims, characterized in that it comprises annular guide means (36) for longitudinally guiding the element to be cut.   11. Apparatus according to any one of the preceding claims, characterized in that it comprises a plate-shaped support (2) extending radially, in which is provided an annular recess (5) for receiving said rings (9). 11) and carrying a motor (20) connected to said first ring (9) for rotational driving, said tool holder (22) being placed outside said recess, and said support (2) has a through passage (4) through which can be engaged the cutting or cutting element (37) and carries an actuating cylinder (40) of a brake pad (41) acting on said second ring (11). .