FR2479163A1 - GUIDING DEVICE WITHOUT FRICTION OF TENSIONED BELT - Google Patents

Abstract

TO ENSURE THE CORRECT TENSION OF A BAND 1 TO WIND UP, THE SLOWING CYLINDERS 2 CLAMPING THIS BAND BETWEEN TWO ELEMENTS 3 IN A LOOP, SURROUNDING THE CYLINDERS. EACH LOOP HAS AN ENOUGH RIGID INTERNAL SURFACE, WHILE ITS EXTERNAL SURFACE IS SUFFICIENTLY FLEXIBLE TO PREVENT ANY DAMAGE OR SCRATCHING OF THE SURFACES OF THE BAND. A DEVICE 6 ALLOWS THE TIGHTENING ADJUSTMENT.

Description

The invention relates to a voltage application device.

or tensioners, for strips of material and comprising at least one tensioner placed on either side of the strip and having a clamping element, a rigid holding frame for this clamping element without the possibility of displacement and a loop contact surrounding the element

clamping and able to move by turning characteristically

téristique by its internal surface sliding smoothly on the peripheral surface of the clamping element, its external surface rotating while remaining in contact with the band, without relative sliding, at least one clamping element being associated with at least one tensioner on a where the

two sides of the strip, to bring the tension (s) close enough

deurs from one side to the one or those on the other side and by means of rigid support for the tensioners not provided with a clamping element, so that the assembly makes it possible to tighten and transfer the strip without disturbing the characteristic rotation of the looped element, when the strip passes between the tensioners, being pulled from the outside after

that the tensioners on one side of the belt have been sufficiently close

from those on the other side by manipulation of the clamping elements.

Thus, the new device facilitates use, maintenance, while lowering the cost price and avoiding all

deterioration of the bands.

In addition, variations in belt tension

are eliminated when wound on an outer core.

The conventional use of belt drive rollers, associated with electrical or mechanical braking means

associated with drawing by a mandrel, has the disadvantage of winding

loosely loose from the belt, harmful to transport and use

by annoying tension irregularities.

The known use of tension pads, opposite on either side of the strip, even provided with pads similar to felt-tip pens, produced by friction from deterioration, scratches, deformations, etc. The objects and advantages of the invention will be better

understood using the following description of preferred examples

of production, and of the appended drawings, in which: FIG. 1A is a schematic front elevation view of an apparatus according to the invention; Figure 11 is a cross section of the apparatus of Figure 1; FIG. 2A is a view similar to FIG. 1A of a preferred embodiment of the apparatus according to the invention;

FIG. 2B is a longitudinal section of the realization

Figure 2A; _ Figure 2C is a cross section, on an enlarged scale, of the device of Figures 2A and 2B; FIG. 3A is a front elevation view of an alternative embodiment; Figure 3B is a cross section, on an enlarged scale, of the device of Figure 3A; Figure 4 is a section similar to Figure 3B of another variant of the clamping part, Figure 5A is a view similar to Figure 3A of yet another variant of the device; and Figure 5B is a section similar to Figure 3B of

Figure SA device.

The tensioners 5 shown in FIGS. 1A and 1B,

each comprise a clamping element 2, the length of which is felt

siablement equal to the width of the strip 1 to be stretched; a looped element 3 surrounds the element 2 and a yoke 4 now rigidly, without allowing its rotation, the clamping element 2 is provided with clamping means fixed to the main frame F, while the tensioners 5 are arranged on the side and on the other side of the strip 1, in opposition, so that the device makes it possible to tighten and transfer the strip 1 when the latter passes between the tensioners 5 sufficiently

tightened by the clamping elements 6, the strip 1 being pulled out

laughing for example by winding on a mandrel. The contact element 3, in a loop, allows rotation by its internal surface sliding smoothly along the periphery of the element 2, with

its outer surface rotating with the band, without sliding, when

that it is pulled outward. In this device, the belt tension is ensured when the tightening applied is sufficient to

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prevent any sliding between the outside surface of the loop 3 and the strip pulled from the outside. The choice of a material ensuring

the friction required between loop and band, by tightening the element

ment 6, is therefore essential for proper tension. From this point of view, the loop 3 is made of material such as Nylon, or elastomer, flexible. The device eliminates the possibility of damage to the

tape, occurring with known devices, preventing any con-

tact of the latter with an abrasive surface of an element.

This result is obtained from the fact that the contact loop constitutes a separator from any contact between the element 2 and the strip. The single loop carries or slides on the peripheral surface of the element 6. The preferred material constituting the other surface of loop 3 is such

than a hard nylon, or elastomer.

This highlights the essential characteristics

contact loop 3 and tightening, provided by element 6.

We will give, below, preferred examples of

realization of the device.

In FIGS. 2, the two tensioners 10 and 14 each comprise clamping elements 7 of length substantially equal to the width of the strip 1, the contact loops 8, having the aforementioned characteristics, separately surround the support frame 9 and the associated clamping elements 7. The tensioner 10 connects the two devices 12 for tightening the upper frame 11 and the tensioner 14 is rigidly supported by the main support 13, so that the whole device can retain and transfer the strip 1, passed between the two tensioners and pulled outwards, those -ci being sufficiently close by the clamping elements 12. The upper support 11 is provided with guide elements 15 to allow the frame 9 of the tensioner 10 the vertical displacements and the correct alignment of the tensioner 14 when the said clamping device 12 is operated. The maintenance and inspection of tensioners 10 and 14 are

facilitated by the fact that one end of the upper chassis is articulated

abutment to the main support 13 by a pin 16, the other end being fixed to it by bolts 17 and the hydraulic cylinder 18, which connects the main support 13 to the upper support 11, is arranged so that the removal of the bolts, followed actuation of the jack 18, rotates the upper support 11 around the axis 16 to release

the clamping elements, and the contact loops, of the two tensioners.

The loops 8 are of the embodiment described above, that is to say that the internal surface of these elements 8 is made of hard nylon or of metal, and their external surface is of nylon, or elastomer, flexible. A variant ensuring the requirements of the internal surface

loops is the lubrication of said internal surface, pre-

refers to self-lubrication. It can also be obtained simply by oil supply conduits to the contact areas of the elements. The tightening devices 12 can be designed in different ways, the essential characteristic being that with the tightening it must be able to be modified to ensure the effective tension, without affecting the characteristic rotation of the loops.

contact, discussed above.

The tightening modification can be done manually-

Lement, by hydraulic cylinders, springs, etc., while connecting the

support 13 and the tensioner 10.

For the simultaneous tensioning of several bands, the exposed devices can be used individually for each separate band or alternatively (FIG. 2C) each tensioner can comprise as many loops 8 as there are bands with common tightening elements, as shown in FIG. 2C , four tensioners each fitted

two loops.

In the variant of FIGS. 3, two tensioners, respec-

23 and 27, each comprise a clamping element 19 in

tray according to the width of the strip 1, the contact loop 21 surrounded

rant the element 19 and one of the pairs of cylinders 20, one of which is provided with the tension-loop element 28, and the chassis 22 for rigidly holding the cylinders 20. The tensioner 23 is connected to the element

fixed to the upper frame 24 of the chassis 26, the tensioner 27 being attached

rigidly attached thereto, so that the assembly can tighten and transfer the mounted band 1, which is pulled from the outside, while the tensioners have been sufficiently tightened by the element

, as described in the previous embodiment.

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The rest of the elements are similar to those already described.

An example of a means of adjusting the tightening in the case

this is described below.

The pressing element 19 (FIG. 4) is connected to the chassis 22 of the tensioner 23 by the guide rods 32 and an externally threaded sleeve 30, which can be screwed into the chassis 22 and the spring 29, so that the parts of loops 21 come into proper contact with the strip to achieve the necessary maintenance without affecting their rotation, as already explained. In addition, the lower ends of the rods are threaded to draw them up on the frame 22,

while the upper ends with heads 31 prevent their separation

tion of the device.

A characteristic of this arrangement is the correct maintenance of the parts of loops 21 with the strip, avoiding any lifting of the latter by the springs 29 in its passage between

the tensioners.

This necessary tightening is obtained by bringing everything together

first the tensioners using element 25 (Figure 3) and, if necessary,

Lement, adjustment of sleeves 30 (Figure 4).

The device produced is not limited to the position

of the element 25 above the strip, this element possibly being inferior

laughing or lateral. Likewise, fluid cylinders can be adapted to

the place of the springs 29.

An alternative embodiment, incorporating characteristics

ristics of Figures 2 and 3 described above, is set out below.

In Figures 5 is shown a tensioner 36 compre-

nant a clamping element 33 acting, along its length, on the width of the strip, a contact loop 34 surrounding the clamping element 33 and a yoke 35 now against the pivoting, relative to the external brackets 40, and a contact loop 42, surrounding the two clamping elements 41, and pulled by the tensioner 43 of the main chassis 39. This device tightens and transfers the strip

inserted therein and pulled outward after tightening the tension

date 36 as described above.

The tensioner 43 is secured by tightening an externally threaded sleeve 46 to compress the spring 47, so

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to tighten the loop 42 by the return cylinder 45 mounted above

of the tensioner.

The other elements of this arrangement are similar to those used previously, the tensioner 44 differing only in the frame 39 for holding the elements 42, comprising brackets 40, which, however, is not imperative, but saves the raw material ,

while ensuring the same results as the previous ones.

The sleeve 46 ensures precise adjustment of the tensioner 43, avoiding the possibility of sliding of the loops 34 and

42, the outside pull of the strip being uniform.

The improvements described above are thus obtained by the characteristic rotation of the drive loops, using simple embodiments, easy to use and maintain,

at low cost.

It is obvious that modifications and variants appear

-will deal with specialists, without going beyond the scope of the invention-

tion.

24 791 63

Claims (10)

R E V E N D I C A T I 0 N S 1. Device for applying tension or tensioners, for strips of material and comprising at least one tensioner placed on either side of the strip and having a clamping element, a rigid holding frame for this clamping element without possibility of displacement and a loop contact element surrounding the element clamping and able to move by turning characteristically tick by its internal surface sliding smoothly on the peri-surface of the clamping element, the external surface rotating in res- both in contact with the strip, without relative sliding, at least one element clamping element being associated with at least one tensioner on one or both sides of the band, to bring the tensioner (s) from one side sufficiently towards that or those on the other side and by means of rigid support for the tensioners not fitted with a clamping element, so that the assembly allows the band to be clamped and transferred without disturbing the characteristic rotation of the looped element when the band passes between the tensioners, being pulled from the outside after that the tensioners on one side of the belt have been sufficiently close from those on the other side by manipulation of the clamping elements. 2. Device according to claim 1 wherein the element looped contact ment surrounds two cylinders or pulleys without preventing said characteristic rotation without slipping. 3. Device according to claim 2 wherein the element clamping is rigidly held by the chassis does not allow as long as a reverse movement without rotation by the use of springs. 4. Device according to claim 2 wherein an adjusting device is arranged in the two cylinders for tensioning the element in a loop, without disturbing its rotation without sliding. 5. Device according to claim 1 in which the separate frames of each clamping element are replaced by a common frame ensuring the stability without rotation of the clamping elements in their respective positions on either side of the strip, without disturbing their rotation characteristic. 6. Device according to claim 1 wherein the tensioner on one side of the band is provided with two clamping elements and not only one, so that they ensure the maintenance of the element loop, without disturbing its rotation characteristic. 7. Device according to claim 6 in which each tensioner, provided with two tightening elements> ensures the tension of the buckle by means of adjustment with a roller which pulls it, without disturbing its rotation characteristic. 8. Device according to any one of claims 1, 2, 5 or 6 in which said loop element is made of two materials, one of which satisfies said characteristic of the internal surface and the other the functional imperative of the external surface of loop ensuring said rotation. 9. Device according to any one of claims 1, 2, 5 or 6 in which the functional imperative of the internal loop surface is ensured by lubrication of this surface to ensure said characteristic rotation. 10. Tensioning device ensuring the simultaneous tensioning of several strips having a common frame, each pair of tensioner tightening a single strip, according to claim 2, these tensioners being rigidly connected by one or more transverse frames, according to a single set, means clamping being arranged in one or more chassis of the assembly, on each coplanar side of said bands,   and reconciled from the other coplanar side, means rigidly supporting   the clamping means and tensioners, not provided with clamping, able to clamp and transfer all of the simulated bands   temporarily without disturbing the rotation characteristic of the loops   with tapes passed and pulled simultaneously by external means laughers, after sufficient tightening of the tensioners using the clamping means.