FR2584970A1 - CUTTING DEVICE FOR MACHINES FOR FORMING ROLLED ARTICLES - Google Patents

Abstract

1. Cutting apparatus for machines making wound products such as wound tubes subject to a movement of rotation and made from strips of fibrous, cellulose, metallic and other materials and comprising means of cutting which can rock, characterized by the fact that the means of cutting are two cutting elements (66, 67), located practically above one another on a rocking fork-joint (40) formed of two wings (44, 45), whose cutting wire (66, 67) moves following a rocking arc (74, 79), the centre of which is the centre (75) of a joint (41) situated, on the one hand, at one of the extremities (42) of the fork-joint (40) rocking around this joint (41) and, on the other hand, at one of the extremities (42) of a fork (22) the positioning of which, in relation to the fork-joint (40) is ensured by means of adjustment consisting of adjusting nuts (63, 64) moving on threads (61, 62) cut at the extremities (53, 54) of a spindle (52) interposed between the flanks (23, 24) of the fork (22) at the place of the joint (41) and causing the displacement of a hub (43) located between the wings (44, 45) of the fork-joint (40) on the spindle (52), the other extremity (32) of the fork (22) being linked by a connecting spindle (33) to the extremity (34) of a cylinder (35) of which the extremity (36) of the piston (35) is linked by a connecting spindle (38) to the extremity (39) opposite to the extremity of the fork-joint (40) provided with the joint (41), the first cutting element (66) having a penetration stroke (66) slightly less than the thickness (68) of the wall (69) of the wound tube (4) subject to a movement of rotation, and the second cutting element (67) going completely through this wall (60) of the wound tube (4).

Description

The invention relates to a cutting device for forming machines

  continuously wound articlesincluding rolled tubes made to

  shooting of fibrous, cellulosic, metallic, plastic material

and others.

  Document FR-A-2 480 179 already discloses a machine for

  continuous forming of tubular sections including inter alia

  tif of cut. This consists of several cutting turrets equipped with cutting sets. These include a jack whose end of

  piston is provided with a clevis connected by a hinge pin to the end

  a lever that can pivot about an axis. The other end of this

  is equipped with an adjustable hinge pin with

  balls serving as connecting element between the axis and two flanges

  between them a cutting blade. As the profile progresses

  tubular on the central mandrel, due to the rotation of the latter, the

  the turrets supporting the cutting turrets move horizontally while the cutting turrets are rotated and pivoted around them

  tubular profile that advances. At the same time,

  Cylinders, the cutting blades, fixed in rotation, on the periphery of the tubular section until the cutting wire of these cutting blades is applied on the periphery of the mandrel. After cutting, said cutting blades are released and the trays are returned to their starting position

for a new cut.

  Furthermore, document FR-A-84.09176 also discloses a device for automatically cutting small, medium and thick circular tubes. According to this document, the mandrel is fixed and the drive

  tubular profile is ensured by the rotation of at least two counter

  rollers resting on the outer circumference of the circular tube, the

  dragging is by friction. The cutting device consists essentially of a machined knife double bevel very sharp. This

  knife can rotate around an axis held by a pair of levers to

  to swing around an axis and actuated by a jack. The speed of the stroke of the piston of this jack is adjustable according to the speed of

  rotation of the circular tube. During this switchover, the knife,

  when rotating during the cutting phase, enters the circular tube.

  For this purpose, the cutting knife comprises a ratchet wheel integral in rotation with said cutting knife. The ratchet wheel cooperates with a ratchet secured to a piston of a jack. In the cutting phase, the pawl locks in -2 - rotation the cutting knife via the ratchet wheel. After

  cutting, the actuator is actuated to cause a partial rotation of the neck.

  cutting edge to prevent heating of the latter. To make sure

  be circular cut, it is necessary that the stroke of the piston is such that the sharp knife comes into contact with the fixed mandrel.

  However, these coonus cutting devices have several

  disadvantages. Indeed, for a certain ganne of coiled tubes used

  in industry and mainly in the textile industry, for

  natural or synthetic yarns and in the magnetic film or tape industry, it is necessary that the rolled tubes, perfectly cut square, are absolutely free of dust. Due

  of their use, these coiled tubes, which must be very smooth,

  an outer coating more noble than the central cardboard core. To avoid the formation of dust due to the shredding of the outer coating, it is therefore imperative that it is cut cleanly by the knife. However, the problem of current cutting devices with knives

  turns is that the knife does not make a sharp cut.

  tisfaisante. Indeed, the knife having a section of the order of 0.3 mil-

  The meters, successively passing through the outer covering and the cardboard core, come into contact with the steel mandrel. As a result, the cutting wire is immediately crushed and tiny, invisible teeth are formed.

  with the naked eye but perfectly detectable under the microscope. In-fur-and-a-measured

  In the case of wear, the knife has more and more teeth. The cup

  has become less and less good, and the teeth are tearing off the outer coating.

  and the particles torn off from the latter will arise as

  dust on the products wound on said tubes.

  Using a fixed knife with fragmentary rotation and fixed mandrel,

  this disadvantage can be partially overcome. However, the use

  This fixed knife requires the manufacture of special machines,

  which leads to an increase in the cost and more particularly in the

  special chines designed for the manufacture of coiled tubes for

industries mentioned above.

  The present invention aims to overcome these disadvantages and proposes to provide a cutting device whose knife retains a

  perfect cutting thread even after several cuts, which makes this

  more reliable cutting than known cutting devices.

  For this purpose, the invention relates to a cutting device for

  Continuous forming of coiled articles, especially coiled tubes

  made from fibrous, cellulosic,

  plastics and others, characterized in that it comprises a first preliminary cutting step performed by a first cutting element whose penetration stroke is slightly less than the thickness of the wall of the wound tube followed by a final cut carried out by a second element

  cutting section completely through said wall of the wound tube.

  The advantages achieved by this invention consist essentially of

  in that the perimeter, in particular the outer covering, is

  by a cutting element whose cutting wire is not damaged by

  contact with the steel mandrel.

  The invention will be well understood with reference to the following description:

  made by way of non-restrictive example and in the drawing annexed hereto

  which: - Figure 1 is an elevational view of the cutting device according to

the invention. -

  FIG. 2 is a sectional view of section line II - II of FIG.

  FIG. 3 is a sectional view of section line III-III of FIG.

re 1.

Referring to Figures 1 and 2.

  The frame 1 of a machine for continuously forming rolled articles,

  In particular, coiled tubes made from fibrous, cellulosic, metal, plastic and other material strips have a slideway 2.

  parallel to the steel mandrel 3 serving as a guide for the wound tube 4, the machine

  China of forming not being represented.

  According to a first embodiment, the steel mandrel 3 is subjected

  at a rotation according to the speed of synchronization of the wound tube 4.

  According to a second embodiment, the steel mandrel 3 is fixed and the wound tube 4 is subjected to a rotational movement via

against-rollers 5 and 6.

  On this slide 2 slides a cutting device 7 according to the invention.

  vention. The latter comprises a base 8 whose lower face 9 has a groove 10, one of the walls 11 has the shape of a dovetail and the other wall 12 is vertical. The slide 2 comprises a boss 13 in the shape of a dovetail. It is disposed between one of the sides 14 of the boss 13 of the slide 2 and the vertical wall 12 of the groove 10 of the base

Z584970

  4. On the top 16 of the base 8 is fixed by fastening elements 17, 18 a plate 19 whose transverse position can be modified relative to the base 8 by elements of FIG. adjustment 20, 21. Furthermore, the fastening elements 17, 18 also serve as locking means for positioning the cutting device 7 relative to the slide 2 of the frame 1. This plate 19 is capped by a fork 22 consisting of two flanks 23, 24 connected by crosspieces, 26. The connection between the plate 19 and the fork 22 is provided by fastening elements 27, 28 screwed into the crosspieces 25, 26. The holes 29,

  30 made in the plate 19 have a larger diameter than the

  fixing devices 27, 28, which enables the position of the device

  7 with respect to the wound tube 4 by bringing it closer together or

  remote and this via an adjusting means 31.

  One of the ends 32 of the fork 22 is traversed by an axis

  articulation 33 serving as a connection between said end 32 of the furnace

  22 and the end 34 of a cylinder 35. The end 36 of the piston 37 of the cylinder 35 is connected by a hinge pin 38 to the end 39 of a

  cleft 40. This can pivot about a hinge 41 located at the other

  end of the yoke 40 and secured to the other end 42 of the

fork 22.

  For this purpose, the yoke 40 comprises a hub 43 disposed between the two flanges 44, 45 of said yoke 40. In this hub 43 is made a bore

  46 opening on both sides to a housing 47, 48 in which is

  pledged a ball bearing 49, 50. Between ball bearings 49, 50

  is interposed a spacer 51. The ball bearings 49, 50 and the

  tretoise 51 are threaded on an axis 52 whose two ends 53, 54 have a bearing 55, 56 engaged in a bore 57, 58 made in

  the flanks 23, 24 of the fork 22. This axis 52 being maintained by elements

  fasteners 59, 60, has two threads 61, 62 made in said ends 53, 54. On these threads 61, 62 move a nut

  63, 64 for adjusting the position of the yoke 40 by

  forked position 22 and, therefore, with respect to the median plane 65 of the

cutting device 7.

  The yoke 40 serves to support a first cutting element 66 whose diameter is such that after the various adjustments the penetration stroke

  67 is slightly less than the thickness 68 of the wall 69 of the tube

  rolled 4. As a result, the cutting wire 70 never comes into contact with

the steel mandrel 4.

  The yoke 40 also serves to support a second cutting element 71 which, in a second cutting phase, passes entirely through the wall 69 of the wound tube 4, paying attention to the fact that the cutting wire 72 of this second cutting element 71 touch the steel mandrel 3 to be sure

  While the cut of the wound tube 4 is real and total.

  The operation of the cutting device is as follows: Via the adjustment means 31 is brought closer to the wound tube

  4 the fork 22, and consequently, the yoke 40 and the first element

  cutter 66, so that the cutting wire 70 approaches the tube

  rolled 4. Then, the actuator 35 is actuated so that the clevis 40 pivots around.

  turn of articulation 41 and that, as a first step, the first element

  66 penetrates into the wall 69 of the wound tube 4. However, the

  Yon 73 of the tilt arc 74 which describes the cutting wire 70 having as its center the center 75 of the articulation 41 is less than the distance 77

  between said center 75 and the inner diameter 78 of the coiled tube 4.

  Then, the second cutting element 71 describing an arc 79

  in the cut line produced by the first cutting element 66 and

  finish the cut of the rolled up tube 4.

  For this purpose, it is imperative that the cutting wire 72 of the second element

  71 are strictly in the same plane as the cutting wire 70 of the first cutting element 66, the adjusting means 80 of the

  position of one cutting element in relation to the other will be described below.

after.

  When the steel mandrel 3 is rotated according to a first

  first embodiment, the first cutting element 66 is fixed in rotation.

  tion and the second cutting element 71 rotates.

  According to a second embodiment, the two cutting elements 66,

  71 are rotated.

  When the steel mandrel 3 is fixed in rotation and the tube wound

  4 rotates, the two cutting elements 66, 71 are fixed.

  According to another embodiment, either one or the other, or the two cutting elements 66, 71 comprise a partial rotation caused by a ratchet wheel cooperating with a ratchet integral with a piston of a

cylinder.

  Referring to FIG. 3, the adjustment means 80

  arranging to dispose the cutting wire 70 of the first cutting element 66 - 6 -

  in the same plane as the cutting wire 72 of the second cutting element 71.

  For this purpose, it is recommended that the first cutting element 66 is positioned

  born in a fixed manner with respect to the inner faces 81, 82 of the wings 44, 45

  of the yoke 40 and that the position of the second cutting element 71 is adjusted.

  According to another embodiment, the first element is positioned

  cutting 66 relative to the second 71.

  According to another embodiment, provision is made for adjusting the posi-

  tion of the two cutting elements 66, 71 with respect to the median plane 65.

  At the location of the first cutting element 66, the yoke 40 comprises an axis 83 held by fixing elements 84. On this axis 83 is threaded a ball bearing 85 held laterally by spacers 86, 87 interposed between said bearing. 85 beads and the internal faces

  81, 82 of the wings 44, 45 of the yoke 40, these struts 86, 87 being

  This bearing 85 is housed in a bore 88

  formed in a hub 89 having a boss 90 serving as a core to the

  the cutting element 66. The latter is held in place by a flange 91 made

  due to the hub 89 by fixing elements 92.

  counter-flange 93 provided with fasteners 94 to maintain lateral-

  the ball bearing 85 in the bore 88 of the hub 89.

  At the location of the second cutting element 71, the clevis 40 comprises

  a second axis 95 parallel to the axis 83 and held by fixing elements

  96, 97. On this axis 95 is threaded a ball bearing 98 housed in

  a bore 99 made in a hub 100 having a boss 101 on the-

  which is threaded the second cutting element 71 held by a flange 102

  rendered integral with the hub 100 by fastening elements 103.

  flange 104 ensures the lateral retention of the ball bearing 98 in the bore.

  99. The axis 95 has at its two ends 105, 106 a thread 107, 108 on which moves a control wheel 109, 110. These adjustment wheels 109, 110 comprise a boss 111, 112 cooperating with the inner cage of the ball bearing 98. By means of these adjustment knobs 109, 110, the second cutting element 71 can be positioned relative to the first cutting element 66 which is normally located in the

  median plane 65 of the cutting device 7.

  Although the invention has been described in connection with a form of

  particular, it is understood that it is by no means limited and that various modifications of forms, materials and combinations of these various elements can be made without departing from

  framework and spirit of the invention.

- 7 -

Claims (20)

claims   1. Cutting device for continuous forming machines for articles   wound coils, in particular coiled tubes made from   fibrous, cellulosic, metallic, plastic and other   in that it comprises a first preliminary cutting step performed by a first cutting element (66) whose penetration stroke (67) is slightly less than the thickness (68) of the wall (69) of the rolled tube (4)   followed by a final cut made by a second cutting element (71)   pouring said wall (69) of the wound tube (4) completely.   2. Cutting device according to claim 1, characterized in that   it comprises a yoke (40) pivoting about a joint (41) so-   lid of a fork (22), this yoke (40) being actuated by a jack   (35) interposed between the fork (22) and the yoke (40).   Cutting device according to claims 1 and 2, characterized   in that the articulation (41) is located at one end of the clevis (40) and that the other end (39) of the clevis (40) is connected by an axis   articulation (38) at the end (36) of the piston (37) of the jack (35).   Cutting device according to claims 1 and 2, characterized   in that the articulation (41) is located at one of the ends (42) of the fork (22) and that the other end (32) of the fork (22) is connected   by a hinge pin (33) at the end (34) of the jack (35).   Cutting device according to claims 1 and 2, characterized   in that the cutting wire (70) of the first cutting element (66) comprises a tilting arc (74) whose radius (73), centered on the center (75) of the articulation (41), is less than the distance (77) between said   center (75) and the inside diameter (78) of the wound tube (4).   6. Cutting device according to claim 1, characterized in that it comprises a base (8) provided with a groove (10) sliding along   a slide (2) integral with the frame (1) of the forming machine.   7. Cutting device according to claim 6, characterized in that   that the base (8) comprises locking means (17, 18) for   position the cutting device (7) with respect to the slide (2).   Cutting device according to claims 1 and 2, characterized   in that it comprises adjustment means (31) for positioning the device   cutting (1) relative to the wound tube (4).   Cutting device according to claims 1 and 2, characterized   In that the articulation (41) comprises adjustment means (61, 62, 63,   64) for positioning the yoke (40) relative to the fork (22).   10. Cutting device according to claim 9, characterized in that   that the adjusting means are adjusting nuts (63, 64) moves   cant on threads (61, 62) made at the ends (53, 54) of an axis   (52) interposed between the flanks (23, 24) of the fork (22) at the location   articulation (41), and causing displacement of a hub (43)   disposed between the wings (44, 45) of the yoke (40) on the axis (52).   11. Cutting device according to claims 1 and 2, characterized   in that the cutting elements (66, 71) comprise a cutting wire (70,   72) located in the same plane one (70) relative to the other (72).   Cutting device according to claims 1 and 11, characterized   in that it comprises means (107 to 110) for adjusting the elements of   pe (66, 71) relative to the median plane (65).   13. Cutting device according to claim 12, characterized in that the means for adjusting the cutting elements (66, 7t) are adjusting wheels (109, 110), moving on threads (107, 108) of an axis (95) interposed between the flanges (44, 45) of the yoke (40) and causing the   moving the hubs (89, 100) of the cutting elements (66, 71).   Cutting device according to claim 12, characterized in that the first cutting element (66) comprises the adjusting means (107). at 110).   15. Cutting device according to claim 12, characterized in that the second cutting element (71) comprises the adjustment means (107 to 110).   16. Cutting device according to claim 12, characterized in that the first cutting element (66) and the second cutting element (71)   comprise the adjustment means (107 to 110).   Cutting device according to claim 1, characterized in that   it comprises a first cutting element (66) movable in rotation.   18. Cutting device according to claim 1, characterized in that   it comprises a first cutting element (66) fixed in rotation.   19. Cutting device according to claim 1, characterized in that   it comprises cutting elements (66, 71) movable in rotation.   20. Cutting device according to claim 1, characterized in that   it comprises cutting elements (66, 71) fixed in rotation.