FR2990201A1 - Method for swiveling object in shape of large-sized panel posed on support, involves relaxing strand between upstream and downstream ends to obtain slackened state in which strand is bent below plane, and returning strand to initial state - Google Patents

Abstract

The method involves removing a face (A1) of an object (A) on a support zone (Z) of a support strand (3a) in an initial tension state. The strand is relaxed between upstream and downstream ends (3a1, 3a2) to obtain a slackened state in which the strand is bent below a horizontal plane with the zone extending in a roughly vertical plane (V). The zone is passed by the downstream end of the strand for swiveling of the object to support over another face (A2) prior to or during a return step at the initial state. The strand is returned to the initial state. An independent claim is also included for an installation for swiveling an object posed on a support.

Description

The present invention relates to a method and an installation for pivoting an object deposited on a support. During their routing on conveyors within a manufacturing or processing site, certain objects may need to be pivotally manipulated for the implementation of appropriate operations on their different faces. However, this pivoting maneuver can be complex and delicate, especially in the case of heavy and / or bulky objects, for example for objects in the form of large panels.

For this purpose, there are facilities called "turners", arranged to ensure the seizure of objects and to cause this pivoting. Some of these installations, called "flexible belt turners", as described, for example, in documents DE-39 17 545 and DE-10 2004 031206, comprise for this purpose a chassis equipped with at least one flexible band having a support strand forming a loop surrounding the object to be rotated. Maneuvering in translation of this support strand, obtained by a path at identical speeds at its two ends, generates the pivoting on itself of the associated object.

But these structures turners flexible band (s), and the pivoting method used, are not completely satisfactory. In particular, the corresponding installations require the use of an additional maneuvering system, such as a traveling crane, for removing the object and removing the rotated object from above.

Such installations can therefore hardly be established in a conveyor system. The dimensions of the object to be maneuvered are also limited, in particular by the length of the support strand surrounding the object. In this context, the applicant has developed a new process and a new installation, which have the advantage of simplifying the removal and removal of objects to rotate, as well as being able to adapt to various shapes and sizes of objects to return. If necessary, the invention can be implemented in a conveyor system of a production line, eliminating the implementation of additional maneuvering means.

In this context, the present invention relates to a method for pivoting an object placed on a support, wherein said object is maneuvered from a support on a first of its faces to a support on a second of its faces; which support consists of a support strand of at least one flexible band, which support strand is delimited by two ends, one upstream and the other downstream, together defining a horizontal plane, or at least approximately horizontal. And this method of pivoting is characterized in that it comprises at least: a step of depositing said first face of said object on a support zone of said support strand which is in an initial state of tension, a release step of said support strand between said ends, so as to obtain a relaxed state in which said support strand is bent below said horizontal plane, with said bearing zone of said support strand extending in a vertical plane, or at least approximately vertical, which passes through said downstream end of said support strand, for the passage of said object to a support on said second face, before or during a step of return to the initial state of tension of said support strand, then said step of returning to the initial state of tension of said support strand.

Thus, in practice, the maneuvering of the bearing area of the support strand in a vertical plane, or at least approximately vertical, makes it possible to bring the associated object in a vertical position, or at least approximately vertical. In this position, the object is in equilibrium or substantially in equilibrium, with its center of gravity being at least approximately at a vertical axis of equilibrium. It can then pivot to a support on its second face when this center of gravity is moved beyond the vertical equilibrium axis. In practice and in particular as a function of the shape of the object, this passage occurs: during said release step, between the release step and the back-tension step of the support strand, or during the step of releasing, of the step of returning to the initial state of tension of said support strand.

When the object has two opposite faces connected by a peripheral edge, an upstream portion of this peripheral edge, located on the side of the upstream end of the support strand during the removal step, is brought into abutment on said support strand when of the release step, for tilting said object around said upstream portion. In this case and without being limited by any theory, the object pivots when its center of gravity moves beyond the vertical axis passing through said upstream portion of its peripheral edge. A translational operation of said support strand, at least at said downstream end and downstream, advantageously causes the passage of the object from a support on its first face to a support on its second face. This translation operation is advantageously carried out: during said relaxation step, between the release step and the step of returning the support strand, or during the return step initial state of tension of this support strand. According to a preferred embodiment, the release step consists of an extension operation of the support strand by a path of said flexible band at said upstream end and downstream; and the voltage return step consists of a shortening operation of said support strand by a path of said flexible band at said downstream end and downstream. In this case, during the stretching operation and during the shortening operation, the flexible strip is advantageously subjected to a speed differential at its upstream and downstream ends. Thus, during the release step, the support strand has a path, at the downstream end and downstream, which is zero or less than that at the upstream end.

Similarly, during the voltage return step, the support strand has a path at the upstream end and upstream which is zero or less than that at the downstream end. During the releasing step, the first face of the object advantageously extends above the downstream end of the support strand, to form a pivot axis for said object.

Preferably, again, during the relaxation step, the upstream and downstream ends of the support strand of the flexible band are approaching from an initial spacing to a final spacing; and during the step of returning to the initial voltage state, the upstream and downstream ends of the support strand of the flexible band return to said initial spacing. The present invention also relates to an installation for pivoting an object placed on a support, in which said object is maneuvered from a support on a first of its faces to a support on a second of its faces, this installation is type comprising a chassis equipped with: a flexible band, a support strand of which is intended to receive one or other of the faces of said object and delimited between two ends, one upstream and the other downstream, which define together a horizontal plane, or at least approximately horizontal, - means for the translational maneuvering of said support strand of the flexible strip, and - control means, comprising means for controlling said translation maneuvering means. According to the invention, this installation also comprises means for adjusting the tension of said support strand of the flexible band; and said control means comprise means for also controlling said voltage adjusting means so as to manipulate said support strand between: an initial voltage state, for the removal of the first face of said object on a bearing zone of said strand; support or for the removal of the rotated object resting on its second face, and - a relaxed state, so as to curl said support strand below said horizontal plane in which said bearing area of the support strand extends into a vertical plane, or at least approximately vertical, which passes through said downstream end of said support strand, for the pivoting of said object to a support on its second face. Other advantageous characteristics, which can be taken independently or in combination, are specified below: the means for the translational maneuver are arranged to cause a path of the supporting strand of the flexible strip at each of the upstream and downstream ends this independently of one another; - At least one of the two ends of the support strand is carried by a trolley operable in horizontal translation relative to the opposite end; - The voltage adjusting means comprise a roller system cooperating with a return strand of the flexible strip; - The roller system comprises a tensioning roller, movable in translation to adjust the path length of the return strand; the chassis is further equipped with at least one removable tray which is movable between an extended position, in which said plate serves as support for one or other of the faces of the object, before or after pivoting of said object and a retracted position, in which said object is able to rest on the supporting strand of the flexible strip and in which said plate extends outside the pivoting trajectory of said object. The invention will be further illustrated, without being limited in any way, by the following description in relation to the appended drawings in which: FIG. 1 is a general and perspective view of an installation according to the invention for pivoting a object; - Figures 2 to 6 illustrate, schematically and side views, the main steps of the kinematic implementation within the installation according to Figure 1 for the pivoting of an object to 1800; - Figure 7 shows a second installation according to the invention, wherein the ends of the support strand are adjustable in spacing; - Figure 8 schematically shows the installation of Figure 7, according to a vertical sectional plane; - Figures 9 to 13 show, seen from the side, the main steps of the kinematic implementation within the installation according to Figures 7 and 8 for the pivoting of an object to 180 °.

An installation 1 according to the invention, as well as the method implemented within this installation 1, are described in the context of a first embodiment illustrated in FIGS. 1 to 6. Object A to be pivotally maneuvered consists for example of a building panel or a mechanical part.

This object A is here represented very schematically in the form of a rectangular parallelepiped. But in practice, it could present a less regular form. The object A represented here comprises two opposite faces A1 and A2 which extend parallel, or at least approximately parallel, with respect to each other. These two faces A1 and A2 are connected by a peripheral edge A3. The structure of the installation 1 is described below in relation to FIGS. 1 and 2. This installation 1 comprises a frame 2 which is equipped with a flexible band 3 for maneuvering the object A from a press on a first face Al until a second face A2 is pressed. The frame 2 here has a generally parallelepipedal shape comprising two vertical side walls 2, formed parallel and at a distance from one another, which are connected by two vertical transverse walls 2b, arranged parallel and at a distance from each other. 'other. The upper edges of these vertical walls 2a, 2b together define an upper opening 2c for access to the flexible strip 3. The flexible strip 3 consists of a continuous strip associated with a set of rollers 4 which extend between the side walls 2a and parallel to each other (these rollers 4 are illustrated schematically in Figures 2 to 6).

The flexible band 3 consists for example of a flexible band, non-elastic, made of an elastomeric material or in the form of a chain. The bearing face of this flexible strip 3 provides a frictional force with the object to be turned over to facilitate its operation. This flexible band 3 comprises two strands, defined by the rollers 4 associated, namely: - an upper support strand 3a, accessible through the upper opening 2c of the frame 2 and intended to receive one or the other of the faces Al, A2 of the object A to rotate, and - a return strand 3b, extending under the support strand 3a and within the frame 2.

The support strand 3a is delimited by two ends, one upstream 31 and the other downstream 3a2, which are each located at and along one of the vertical transverse walls 2b, close to the upper edge of the latter .

The two ends 3a1, 3a2 together define a horizontal plane P, or at least approximately horizontal (Figure 2). These two ends 31, 3a2 of the support strand 3a are here formed by two upper rollers, one upstream 4a1 and the other downstream 4a2, which extend parallel and at a distance from one another.

These upper rollers 4a1, 4a2 are motorized here to operate in translation the support strand 3a at each of its two ends 3a1, 3a2. Depending on their direction of rotation, these upper rollers 4a1, 4a2 exert a pulling action upstream or downstream at the respective upstream ends 3a1 and downstream 3a2 of the support strand 3a. The upper rollers 4a1 and 4a2 are associated with means for rotating them about their respective axes of rotation, independently of one another, for example in the form of a dedicated geared motor device.

This structure will thus allow a local and controlled path of the support strand 3a of the flexible band 3, upstream or downstream, at each of the upstream ends 3a1 and downstream 3a2. In general, the term "upstream" means a path of the flexible strip 3, or a portion of the flexible strip 3, in a direction from the downstream end 3a2 to the upstream end 3a1. By "downstream" is meant a path of the flexible strip 3, or part of the flexible strip 3, in a direction from the upstream end 3a1 to the downstream end 3a2. The return strand 3b is also associated with a set of rollers 4b, namely: two fixed lower rollers, one upstream 4b1 and the other downstream 4b2, extending parallel and at a distance from each other in a horizontal plane; an overlying lower roll 43, whose axis of rotation is also fixed, formed here just below the upper upstream roll 4a1, and a lower movable roll 4b4, operable in translation parallel to itself in a plane vertical, to form a tensioning roller. In this case, the two fixed lower rollers 4b1 and 4b2 define a horizontal section of the return strand 3b, extending parallel and away from the horizontal plane P. The lower fixed lower roller 4b2 is located directly vertically downstream of the upper roller 4a2. The lower movable roller 4b4 is directly vertical to the upper upstream roller 4a1. The upstream fixed lower roller 4b1, the overlying lower roller 43 and the lower movable roller 4b4 are in turn successively offset from downstream to upstream. The upstream fixed lower roll 4b1, the underlying lower roll 4b3, the movable lower roll 4b4 and the upstream upper roll 4a1 are further arranged so that the sections of the return strand 3b which connect them define a generally S-shaped path or The upstream portion of the path defined between the overlying lower roll 4b3, the lower movable roll 4b4 and the upstream upper roll 4a1 is of variable length; it is a sort of tape storage shop. These sections of the return strand 3b extend more precisely vertically, or at least approximately vertically, and facing each other. In this context, the lower movable roller 4b4 is here operable to adjust the path length of the return strand 3, and thus to change the tension and the length of the support strand 3a. In this case, the lower movable roller 4b4 is operable in height (vertically) to adjust its distance with the upstream upper roller 4a1 and the overlying lower roller 4b3.

For its operation, the installation 1 further comprises control means (not shown) integrating: - means for controlling the rotation of the upper rollers 41 and 42, and - means for controlling the translation of the tensioning roller 44. These means of control consist for example of an industrial PLC or a micro-PLC.

The configuration of these control means is described below in relation to FIGS. 2 to 6, in the context of a method for pivoting the object A resting on the support strand 3a of the flexible strip 3. In In this case, the control means pivot the object A to 1800, that is to say, again a tilting or reversal of the object A, from a bearing on a first face Al to a support on a second face A2. This process begins with a step of removing the object A on the support strand 3a which is in an initial state of tension (FIG. 2).

For this, the two motorized rollers 4a1, 4a2 can be rotated simultaneously at the same speed and in the same direction, to ensure a translation of the support strand 3a in a direction allowing the lateral loading of the object A (this object A being for example supported on conveying means juxtaposed).

The support strand 3a in its initial state of tension advantageously extends in the horizontal plane P, or at least approximately in this horizontal plane P. For this purpose, the tensioning roller 4b4 is here in the low position. The first face Al of the object A rests on a support zone Z of the support strand 3a. The bearing zone Z of the support strand 3a corresponds to the surface delimited by the face Al facing the object A. This bearing zone Z further extends between the downstream end 3a2 of the support strand 3a and an upstream portion A31 of the peripheral edge A3 of the object A located on the side of the upstream end 3a1. Before pivoting, the support strand 3a is advantageously manipulated in translation so as to position the object A to pivot on the side of its downstream end 3a2, above the upper downstream roller 4a2. This positioning is particularly useful for laterally clearing the object A with respect to the upstream upper roller 41, and to optimize the desired pivoting operation. Then, the control means provide a step of releasing the support strand 3a by means of an elongation operation of this support strand 3a from its upstream end 3a1 (Figure 2 to Figure 4).

For this, the upper upstream roller 4a1 is rotated (clockwise in Figure 3), so as to ensure a path of the flexible band 3 at the upstream end 3a1 and downstream. Simultaneously with this rotation of the upper upstream roller 4a1, the tensioning roller 4b4 rises vertically so as to release slack for the support strand 3a. The motorized downstream roller 4a2 is meanwhile stopped. Alternatively, it may optionally be pivotally operated to move the downstream end 3a2 downstream, at a lower speed than that of the upstream end 3a1. The maneuver at the upstream end 3a1 leads the support strand 3a to a so-called "relaxed" state, in which it is bent below the horizontal plane P. The length of the support strand 3a is then greater than the distance separating the two upper rollers 4a1, 4a2.

The support of the object A on the support strand 3a still maintains the latter in tension. This particular maneuver also guides the bearing zone Z of the support strand 3a to a vertical V plane, or at least approximately vertical, passing through the downstream end 32 (FIG. 4).

In practice, the bearing zone Z is intended to extend more precisely in a vertical plane V corresponding to a tangent of the upper downstream roller 4a2. In addition, the term "at least approximately vertical" means the maneuvering of the bearing zone Z in an angular sector defined by an angle a on each side of the vertical plane V. This value of the angle a is a function of the object A to return, but advantageously has a value between 5 ° and 100 relative to the vertical plane V. During this release step, the object A comes to take a vertical position, or at least approximately vertical; the upstream portion A31 of its peripheral edge A3 is in turn brought to bear on the support strand 3a (Figures 3 and 4). Then, the control means drive the upper rollers 4a1 and 4a2 so as to implement a step of returning to the initial state of tension of the support strand 3a by its shortening on the side of its downstream end 3a2 (FIGS. 4 to 6) . For this, the upper downstream roller 4a2 is here operated in rotation (clockwise in Figure 5), so as to ensure a path of the flexible band 3 at the downstream end 3a2 and downstream. Simultaneously with this rotation of the upper downstream roller 4a2, the tensioner roller 4b4 descends vertically. The upstream upper roller 4a1 is meanwhile stopped. Alternatively, it can be manipulated in rotation to move the upstream end 3a1 upstream, at a lower speed than that of the downstream end 3a2. At the end of rotation of the upper upstream roller 4a1 or the beginning of rotation of the downstream motorized roller 4a2, the object A rocks around the upstream portion A31 of its peripheral edge A3 bearing on the support strand 3a.

Depending on its shape, the object A can switch automatically when it reaches its vertical position. But, more frequently, during the voltage return step, it is the translational movement of the support strand 3a at its downstream end 3, and downstream, which causes this tilting.

This movement makes it possible to exert an initial pull downstream on the upstream portion A31 of the peripheral edge A3 of the object A. This traction force is intended in particular to move the center of gravity G of the object A on the upstream side of a vertical equilibrium plane E defined by a vertical alignment of the center of gravity G and of the upstream portion A31 of its peripheral edge A3 (in particular of the upstream edge of this upstream portion A31) (FIG. ). The tilting is further favored by the support of the first face Al of the object A at the upper downstream roller 4a2 serving as abutment / pivot. Alternatively, to cause the switching of the object A, between the release step and the step of returning to the initial voltage state, the control means drive the upper rollers 41 and 42 in the same direction of rotation, so as to maneuver the support strand 3a downstream. The upper downstream roller 4a2 thus rotates to bring back the support strand 3a in the initial state of tension and to bring the returned object A to a horizontal position in which its second face A2 bears on the support strand 3a. The returned object A is thus in the evacuation position. The two motorized rollers 4a1, 4a2 can then be rotated simultaneously, in the same direction and at the same speed, to cause a lateral translation path of the associated object A, for example in the direction of a juxtaposed conveyor device. The installation 1 is then ready to receive a new object A to return. A second embodiment of the invention is illustrated in Figures 7 to 13. To simplify the description of this embodiment, the reference marks designating the structural elements identical or similar to those of Figures 1 to 6 are retained. Thus, the installation 1 illustrated in FIGS. 7 and 8 is provided with a frame 2 associated with a flexible band 3 carried by a set of rollers 4. The flexible band 3 is here in the form of two parallel strips, possibly connected by bars or slats to form the two strands, one support 3a and the other return 3b.

This installation 1 also comprises the two motorized upper rollers, one upstream 4a1 and the other downstream 4a2. It also comprises two free rotating rollers 4b5 and 4b6, for guiding the associated return strand 3b. The two lower rollers 4b5 and 4b6 define between them a horizontal section of the return strand 3b, extending parallel and at a distance from the horizontal plane P (FIG. 8). These upstream 4b5 and downstream 4b6 lower rollers are respectively directly vertical to the upstream upper rollers 4a1 and downstream 4a2.

This installation 1 differs from that of Figures 1 to 6 in particular by the presence of a carriage 10 carrying the upper downstream roller 42 and the lower downstream roller 4b6. This carriage 10 is operable in horizontal translation, controlled by the control means of the installation (not shown).

The upper downstream rollers 4a2 and lower downstream rollers 46 carried by this carriage 10 thus also undergo such a horizontal translational movement. For its operation from an initial position remote from the upstream rollers 4a1, 4b5 to a final position in the vicinity of these same upstream rollers 4a1, 4b5, the upper downstream roll 4a2 is locked in rotation in combination with an appropriate rotation of the upper roll upstream 4a1 as developed later. For its return to its initial position from a displaced end position, this carriage 10 is associated with a device 11 of the counterweight type whose operation is developed below. This installation 1 is still distinguished in that it is equipped with two removable trays 12, intended to extend in the extension and on both sides of the side edges of the support strand 3a of the flexible band 3. These trays 12 are here pivotably movable around one of their end edges so as to be able to be operated between deployed and retracted positions described in more detail below with reference to FIGS. 9 to 13.

In practice, a first face Al of the return piece A is first deposited on the moving plates 12 placed in the horizontal extended position (FIG. 9). The two motorized rollers 4a1, 4a2 are positioned at a distance from each other, and they are stopped.

For the overturning of the object A, the mobile trays 12 are maneuvered in the retracted position; the first face A1 of the object to be turned A is then rest on the support strand 3a of the flexible band 3 (Figure 10). The support strand 3a then undergoes a releasing step consisting of an extension operation of the support strand 3a by a path of the flexible band 3 at the upstream end 3a1, downstream (FIGS. 10 to 12). This maneuver is obtained by a suitable rotation of the upper upstream roller 4a1, here in a counterclockwise direction according to FIG. 11.

The downstream roll 4a2 is in turn locked in rotation.

Because of its shortening, the return strand 3b causes a pull on the rollers 4a2, 46 carried by the carriage 10, leading to their movement in translation, with a coming together of the upper downstream roller 4a2 towards the upper upstream roller 4a1 opposite.

This movement ensures the reduction of the length of the return strand 3b, by reducing the spacing between the lower rollers 4b5 and 4b6. The movement of the carriage 10 causes the displacement of the counterweight in the up position, accumulating a potential energy of useful gravity for the subsequent return of the carriage 10 to the initial position.

The motorized rollers 4a1, 4a2, as well as the corresponding ends 31, 32 of the support strand 3a, approach from an initial spacing (FIGS. 9 and 10) to a final spacing (FIG. 12) which corresponds, at least approximately, to the thickness of the object A (this final separation between the rollers 4a1 and 4a2 is in fact advantageously slightly greater than the thickness of the object A). The elongation of the support strand 3, in combination with the bringing together of the motorized rollers 41, 42, together ensure an optimal conformation of the support strand 3a for the maneuvering of the object A. This results in a pivoting of the bearing zone Z from a horizontal initial position to a vertical end position, or at least approximately vertical; the associated object A is also held vertically or at least approximately vertically by the two motorized rollers 4a1, 4a2 and by the support strand 3a in said relaxed state (here U-shaped).

Optionally, the operator can intervene on one and / or the other of the faces A1, A2 of the object A thus maintained, of which an upper part extends in vertical projection above the horizontal plane P. The process reversal continues with the return tension of the support strand 3a, this through a shortening operation of this strand obtained through a path of the flexible band 3 at the downstream end 3a2 and downstream. For this, the upper downstream roller 4a2 rotates so as to ensure this path, in combination with a return of the movable carriage 10 in its original position caused by the return of the counterweight in the down position (Figure 13).

During this step, the corresponding ends 3a1, 3a2 of the support strand 3a move away from each other from the final gap, to return to the initial spacing. These particular movements make it possible to exert the initial pull downstream on the upstream portion A31 of the peripheral edge A3 of the object A, leading to the bearing of its second face A2 on the support strand 3a. When the object A has returned to the horizontal position, after its reversal to 1800, the mobile trays 12 are maneuvered to resume their deployed position to bring the object A returned.

In general, according to the invention, the control means may apply maneuvers complementary to the upper rollers 4a1, 4a2, so as to properly maneuver the object resting on its support strand 3a. Still more generally, according to the invention, the method can be adjusted to apply a rotation adapted to the shape to be rotated, for example a rotation at 90 ° can be implemented for an object whose faces extend to the square to each other and are connected by a joining edge.

Claims (1)

CLAIMS 1.- A method for pivoting an object (A) placed on a support (3a), wherein said object (A) is operated from a support on a first of its faces (A1) to a support on a second of its faces (A2), which support (3a) consists of a support strand (3a) of at least one flexible band (3), which support strand (3a) is delimited by two ends, one upstream (3a1) and the other downstream (3a2), together defining a plane (P) horizontal, or at least approximately horizontal, which method of pivoting is characterized in that it comprises at least: - a step of depositing said first face (A1) of said object (A) on a support zone (Z) of said support strand (3a) in an initial state of tension, - a step of releasing said support strand (3a) between said ends (3a1, 3a2) , so as to obtain a relaxed state in which said support strand (3a) is bent below said horizontal plane (P), with said bearing zone (Z) extending in a vertical (or at least approximately vertical) plane (V), which passes through said downstream end (3a2) of said support strand (3a), for pivoting said object (A) to the support on said second face (A2) before or during a step of returning to the initial state of tension of said support strand (3a), then - said step of returning to the initial state of tension of said support strand (3a) ). 2. A method for pivoting an object according to claim 1, said object having two opposite faces (A1, A2) connected by a peripheral edge (A3), characterized in that an upstream portion (A31). of said peripheral edge (A3) of the object (A), situated on the side of the upstream end (3a1) of the support strand (3a) during the removal step, is brought into abutment on said support strand (3a). ) during the release step, for tilting said object (A) around said upstream portion (A31). 3. A method for pivoting an object according to any one of claims 1 or 2, characterized in that before or during the step of returning to the initial state of tension of the support strand (3a) , a translation operation of said support strand (3a), at least at said downstream end (3a2) and downstream, causes the operation of said object (A) from a bearing on its first face (A1) to a support on his second face (A2). 4. A method for pivoting an object according to any one of claims 1 to 3, characterized in that the releasing step consists of an operation of elongation of said support strand (3a) by a path of said strip flexible (3) at said upstream end (3a1) and downstream, and in that the voltage return step consists of a shortening operation of said support strand (3a) by a path of said flexible band ( 3) at said downstream end (3a2) and downstream. 5. A method for pivoting an object according to any one of claims 1 to 4, characterized in that, during the releasing step, the first face of the object (A1) extends beyond above the downstream end (3a2) of the support strand (3a), to form a pivot axis for said object (A). 6. A method for pivoting an object according to any one of claims 1 to 5, characterized in that, during the release step, the upstream ends (3a1) and downstream (3a2) of the support strand ( 3a) of the flexible strip (3) approach from an initial spacing to a final spacing, and that, during the step of returning to the initial state of tension, the upstream (3a1) and downstream ends (3a2) of the support strand (3a) of the flexible band (3) return to said initial spacing. 7.- Installation for pivoting an object (A) placed on a support (3a), wherein said object (A) is operated from a support on a first of its faces (A1) to a support on a second of its faces (A2), which installation (1) comprises a frame (2) equipped: - a support strand (3a) constituted by at least one flexible band (3), intended to receive one or the other of said faces (Ai, A2) of said object (A) and delimited between two ends, one upstream (3a1) and the other downstream (3a2), which together define a horizontal plane (P), or at least approximately horizontal, - means (4a1, 4a2) for the translational maneuvering of said support strand (3a) of the flexible band (3), and - control means, comprising means for controlling said translational maneuvering means (4l, 4a2), characterized in that said installation (1) comprises means (4) for adjusting the tension of said support strand (3a) of the flexible band (3), and in that said control means comprise means for also controlling said voltage adjusting means (4) so as to manipulate said support strand (3a) between: an initial voltage state, for the removal of said first face (A1) of said object (A) on a support zone (Z) of said support strand (3a) or for the removal of the rotated object (A) resting on its second face (A2), and - a relaxed state, so as to bend said support strand (3a) below said horizontal plane (P) in which said support zone (Z) of the support strand (3a) extends in a vertical (or at least approximately vertical) plane (V) which passes by said downstream end (3a2) of said support strand (3a), for pivoting said object (A) to a support on its second face (A2). 8.- Installation for pivoting an object according to claim 7, characterized in that the translation means (4a1, 4a2) are arranged to cause a path of the support strand (3a) of the flexible strip (3) at the each of the upstream (3a1) and downstream (3a2) ends independently of one another. 9.- Installation according to any one of claims 7 or 8, characterized in that at least one of the two ends (3a2) of the support strand (3a) is carried by a carriage (10) operable in horizontal translation relative at the other end (3a1) opposite. 10.- Installation according to any one of claims 7 to 9, characterized in that the tension adjusting means (4) comprise a roller system (4b) cooperating with a return strand (3b) of the flexible strip (3). ).