FR2639368A1 - SCRAPER CYLINDER WITH TRIM MOUNTED ON AN INTERCHANGEABLE SLEEVE - Google Patents

Abstract

According to the invention, the scraper cylinder is composed of a central cylindrical element 11 rotating around an axis 5 and of a tubular element 6 on the surface of which is fixed the card lining, for example a fabric 7 supporting teeth. metal 3 wound around the tubular element 6 and glued to it. The tubular element 6 is fitted onto the central element 11 and locked thereon by locking means, for example a locking ring 14, 15.

Description

SCRAPER CYLINDER WITH LINING MOUNTED ON A SLEEVE

INTERCHANGEABLE

  The present invention relates to a scraper cylinder intended to equip scraping machines, of the woolly, felting, chardonneuse type. In these machines, the scraping rollers are coated with card lining, and have an action on the fibrous surface of the fabrics, knits, nonwovens or other articles of the textile type which are treated in such machines. The term card lining is also taken in a general sense, it is a lining, intended to be mounted on a scraping cylinder, and IO on which are implanted teeth whose shape and dimensions depend on the desired effect. and will therefore vary from one machine to another. For example, in a woolen machine, the teeth of workers called bristles are inclined in the direction of the direction of advancement of the fabric, the teeth of workers called counterpiles are inclined in the direction opposite to the direction of advancement of the fabric. For example, in a chardonneuse, the teeth of the cylinders, called thistles, are

  inclined in the direction of their axis of rotation.

  The scraper cylinder for a chardonneuse, known for example from French patent NO 1,388,703, comprises a body of revolution, which can be a wooden bobbin, the lateral surface of which is covered with a card lining. In the two end faces of the bobbin are driven two axes whose outer heads have recesses engaged respectively on two fixed journals, thus allowing the free rotation of the scraper cylinder. The scraping cylinders for woolen or felting machines have the same structure but they are driven

positively rotating.

  In the case of scrapers with positive rotation drive, the action of the card lining on the fibrous surface causes wear of the lining tips over time. This wear is remedied by periodic sharpening, after a number of hours of production which can range from 800 to 1,200 hours depending on the articles treated. To carry out this sharpening, it is necessary to dismantle the scraping cylinders of the machine, proceed with the sharpening and reassemble the cylinders. This operation is long and results in significant immobilization of the machine. The downtime can be reduced by having a set of spare cylinders, but this requires a significant investment. In addition, after three or four sharpenings, the card linings must be changed, which requires the disassembly of the machine cylinders, the extraction of the worn lining, the positioning around the cylinder of a

  new packing and reassembly of the cylinders.

  Now we have found and this is what is the subject of the invention a scraper cylinder which overcomes the drawbacks noted in that it significantly reduces the downtime of the machines for the maintenance of the lining without causing d important investment. The scraper cylinder comprises in a known manner a body of revolution rotating about an axis and

  the outer surface of which is covered with a card lining.

  According to the invention the body of revolution is composed: a. a first central element, of cylindrical external shape, rotating around an axis, b. a second tubular element, the outer surface of which is coated with the card lining, and the inner recess of which has a diameter slightly greater than the outer diameter of the first element, said second element being mounted around the first element by sliding,

  vs. and means for blocking the second element on the first.

  According to the invention the card lining is mounted on a second sheath-like element, sliding on the rotating part of the cylinder. Thus to proceed to the sharpening or replacement of the linings, it suffices to remove the mounted sleeve and to fit on the rotating part another sleeve provided with a lining in good condition. Such a replacement only requires, for example, the disassembly of small cylinders of the Mini-T type according to French patent N 2,578.86l and not that of the large working cylinders of a conventional woolen machine. The downtime is therefore significantly reduced. Of

3 2639368

  the lower the additional cost generated by the sleeves, the more so as the scraper cylinder of the invention can equip the

  most existing scraping machines.

  Preferably the second tubular element being made of a flexible material, it comprises at each end at least one slot made according to a generator, and the locking means consist of two clamping rings each placed at level t. And at one of the ends enclosing the second element in an area thereof not covered with card lining against the first

element.

  This second flexible element can be produced in the form or

  plastic cardboard tubes, in particular.

  Advantageously in the aforementioned version, the scraper cylinder is equipped with two protective cups, each one being mounted at one end of the latter, said cups having an annular part flush with the card lining and

covering the clamping ring.

  In the case where the second element is made of a rigid material, for example a light metal, and of small thickness, the scraper cylinder has two spacer rings, placed between the first and the second elements at each of its ends. This ring allows to compensate for a possible

difference in diameter.

  Preferably and in particular when the card lining is wound in a helix around the second element, the latter comprises two reinforcement eyelets, an eyelet at each end in an area devoid of card lining, and the locking means consists of a screw of which the threaded rod enters the eyelet and the head of which applies the second element against the

first.

  The invention will be better understood on reading the

  description which will now be made of two examples of

  embodiment of the scraper cylinder with interchangeable lined sheath, illustrated by the appended drawing in which: FIG. I is a schematic sectional view of a woolen cylinder, equipped with a sheath of the pile or counterweight type FIG. 2 is a diagram in section of the cylinder of FIG. 1 equipped with a thinner metallic sheath FIG. 3 is a schematic sectional view of a cylinder for a chardonneuse equipped with a thistle-type sheath. The scraping cylinders 1 and 2 shown in FIGS. 1 and 2 are cylinders of the pile or counterweight type, the teeth 3 of the card lining being inclined in the direction of the direction of advance of the article (bristles) or in the opposite direction

  (counterweight). This inclination is not visible in the figures.

  It is more precisely a cylinder of the Mini-T type, as described in French patent NO 85.03.741, provided with a

  elastic coupling with quick release.

  The body 4 of the cylinder 1 has a cylindrical outer shape and rotates around its axis 5, by known means not shown. The sheath 6 is, in the version shown in FIG. 1, a cardboard tube, on which is helically wound and glued by adhesive the fabric 7 supporting the teeth 3 of the

garnish.

  In areas corresponding to the start and end of the filling, i.e. in areas that are not filled

  the sheath is crossed by a reinforcement eyelet 8.

  FIG. 1 represents the cylinder 1 after the sheath 6 coated with its lining 3.7 has been fitted onto the body 4 of the cylinder I. The sheath 6 is blocked on the body 4 by insertion of a screw into the eyelet 8 and screwing it

  in the threaded opening facing it in the body 4.

  In the version shown in Figure 2, the sleeve 6 is made of light metal with a thickness thinner than that of the cardboard tube of Figure 1. In this case a spacer ring 9 is placed at each end of the cylinder I between the body 4 and the sheath 6. The function of this ring 9 is to compensate for any deviations with a view to obtaining a cylinder whose scraping diameter is acceptable, and this regardless of the diameter of the

2639368

existing body 4.

  The scraping cylinder 10 of FIG. 3 is a thistle type cylinder, the teeth 3 of the card lining being inclined.

  in the direction of the axis of rotation 5 of the cylinder.

  It has a central tube It is rotatably mounted on sealed ball bearings 12 relative to an axis 13 on

crossing right through.

  On the central tube It is fitted the sheath 6 on which is wound and glued with an adhesive the fabric 7 supporting

  the teeth 3 of the card lining.

  The sleeve 6 is a cardboard tube, the two ends of which are split over a length of 20 mm, each by two slots made according to generators diametrically

  opposite in areas without trim.

  The blocking of the sleeve 6 on the central tube It is obtained by the two clamping rings 14, 15. The presence of the slots made in the sleeve 6 makes it possible to compensate for any deformations of the sleeve 6 during tightening against the central tube 11, deformations due to the difference between the diameter

  outside of the central tube 11 and the inside diameter of the sleeve.

  The difference in diameter is of the order of 0.1 to 0.2 mm.

  The ends of the sheath 6 are protected by the protective cup 16, the annular part 17 of which extends above the unadorned zone, including the clamping rings 14, 15 and is flush with the top of the teeth 3 of the gasket. card. These cups 16 have the function of preventing attack and exit

  brutal teeth 3 on the article to be treated.

  A protective ring 18, made of foam, placed against the rear face of the cup 16 prevents the fibers on the surface of the article to be treated from entering between the fixed axis 13 and the support

thistle.

  The cup 16 holds by crushing the O-ring 19

  when it is inserted into the bore of the central tube 11.

  The invention is not limited to the two embodiments which have just been described by way of non-exhaustive examples,

  but covers all variants.

  It is understood that this invention will be all the more advantageous as the wear of the lining will be rapid, therefore in the scraping machines in which the cylinders are driven positively, in particular the woolen machines. Indeed in the chardonneuses, the thistle does not re-acute and its replacement

  only intervenes after normal or accidental wear.

  Thus, thanks to the lined barrel cylinder of the invention, the user will be able to replace the used linings by simple exchange of the sheath, or even replace a lining with a

  another better suited to certain scraping works.

Claims (6)

  1. Scratching cylinder for a scratching machine, of the type comprising a body of revolution rotating about an axis and the outer surface of which is coated with a card lining, characterized in that the body of revolution is composed of: a. a first central element (11), of cylindrical external shape, rotating around an axis (5), b. a second tubular element (6), whose outer surface (7) is coated with the card lining (3), and whose inner recess has a diameter slightly greater than the outer diameter of the first element (11), said second element (6) being mounted around the first element (11) by sliding, and the scraper cylinder comprises means for blocking the second element on the first.   2. Scraper cylinder according to claim 1 characterized in that, the second tubular element (6) being made of a flexible material, it comprises at each end at least one slot made according to a generator, and the locking means consist of two rings clamp (14,15) each placed at one of the ends and enclosing the second element (6) in an area thereof uncoated with card lining against the first element (11).   3. Scraper cylinder according to claim 2 characterized in that it is equipped with two protective cups (16), each being mounted at one end thereof, said cups (16) having an annular part (17) flush with the card filling   (3) and covering the clamping ring (14,15).   4. Scraper cylinder according to claim I characterized in that, the second element (11) being made of a rigid material and of small thickness, the scraper cylinder has two spacing rings (9), placed between the first (11) and the second   (6) elements at each of its ends.   5. Scraper cylinder according to claim 1 characterized in that, the card lining consisting of a fabric (7) supporting the metal teeth (3), the fabric (7) is fixed to the second   element (6) by means of an adhesive.   6. scraper cylinder according to claim 5 characterized in that, the fabric (7) being wound helically around the second element (6), the latter comprises two eyelets (8) for reinforcement, an eyelet (8) at each end in a zone without card lining, and the locking means consist of a screw, the threaded rod of which enters the eyelet and the head of which applies the second   element (6) against the first (11).