WO2003018895A1

WO2003018895A1 - Method and device for forming a double-loop knot, a single-loop knot or a square knot from a string or the like

Info

Publication number: WO2003018895A1
Application number: PCT/FR2002/002947
Authority: WO
Inventors: Jean-François Perrier
Original assignee: Perrier Jean-Francois
Priority date: 2001-08-28
Filing date: 2002-08-28
Publication date: 2003-03-06
Also published as: WO2003018895A8; EP1430174A1; FR2829157B1; FR2829157A1

Abstract

The invention concerns a method and a device for forming a double-loop, a single-loop or a square knot from a string (5) or the like for tying up gifts, for decorative loops, for shoe string knots or the like. The invention is characterised in that it comprises at least four rods (52, 53, 54, 55) extending globally parallel to one another, preferably horizontally, forming a parallelogram consisting of two lower rods (52, 53) and two upper rods (54, 55) and it comprises at least two gripping means (58, 59) adapted to be displaced along opposite directions such that a first loop (56) is obtained by winding the string (5) around three rods, two lower rods (52, 53) and one upper rod (55), a second loop (57) is obtained by winding the string (5) around three rods, the two lower rods (52, 53) and the remaining upper rod (54) and such that the loops (56, 57) are passed through each other to form a double-loop knot.

Description

METHOD AND DEVICE FOR FORMING A DOUBLE LOOP, SINGLE LOOP NODE OR A FLAT NODE FROM A

TWINE OR THE LIKE

The present invention relates to a method of forming a double loop, single loop knot or a flat knot from a string, rope, cable or the like for tying bundles, for decoration loops, etc ... and a device implementing the method. The invention will find many applications in particular in the field of gift packages, shoes, decoration, agriculture for the formation of hay bales, etc. In the packaging field in particular, it is well known methods of tying a product, such as a bundle of newspapers for example, consisting in surrounding the bundle with a string which is then stretched and from which the two stretched strands are glued, welded or stapled. In order to obtain a “gift pack” appearance, for example, conventionally comprising a double loop knot, a double loop knot previously formed manually by operators is reported by any known means, such as gluing or stapling. operators. In addition to the unconvincing aesthetic appearance, all these methods have the disadvantage of being particularly expensive to implement because of the manpower necessary for the realization of such knots so that the packaging of the products in the form of Gift packages are generally produced at the point of sale by the vendors themselves.

One of the aims of the invention is therefore to remedy all these drawbacks by proposing a method for forming a double loop knot, a single loop knot or a flat knot from a string or the like and a device implementing the simple and inexpensive design process.

To this end, the method of forming a double loop knot, single loop or a flat knot from a string or the like according to the invention is remarkable in that it consists at least of forming , through rotation, from a piece of string, two opposing loop loops each extending on one side of a median plane orthogonal to the axis of the loops and then passing the loops into each other so get a double loop knot, single loop knot or a flat knot.

According to a particularly advantageous alternative embodiment of the method according to the invention, the string being positioned around the bundle to be tied so that it forms two strands extending generally parallel and vertically on either side of a median plane, the method consists at least in the following stages: one grips each strand of the string, then one moves each of the strands from their respective gripping positions to the median plane, one of the strands at least along a helical trajectory and the other clamp extending close to the axis of the helical path of the first strand, then each of the strands is moved linearly from the median plane to the side opposite to the gripping position of each of the strands to form and tighten the knot and finally we release the strands of the string.

Furthermore, the strands are respectively moved from their gripping position at least to the median plane, and preferably each strand is moved from its gripping position to the gripping position of the other strand, following trajectories concentric helical opposite in direction and direction, the helical path preferably consisting of at least one revolution of a turn. In addition, the string being positioned around the bundle to be tied, an ordinary knot is made beforehand so that the two strands of string extend generally parallel and vertically on either side of the median plane. It will be understood that the method of forming a double loop knot according to the invention consists in applying simple movements of rotation and / or translation, the helical trajectory consisting in the combination of a rotation and a translation, with the strands of a string, so that these movements are easily achievable by automatic machines thus making it possible to make gift packages, decoration knots, etc. industrial. However, these rotational and / or translational movements are also achievable from manual devices without departing from the scope of the invention of course.

Another subject of the invention relates to a device for forming a double loop knot from a string or the like for tying gift packages, for decoration loops, for shoe knots or the like, putting implement the remarkable method in that it comprises at least two gripping means and actuating means such that said gripping means are moved in two opposite directions and that at least one gripping means is moved in a overall helical trajectory.

According to an alternative embodiment of the device for the formation of a double loop knot from a string or the like implementing the method, the device is remarkable in that it comprises at least four rods extending overall parallel to each other, preferably horizontally, forming a parallelogram consisting of two lower rods and two upper rods and in that it comprises at least two gripping means capable of being moved in opposite directions, such so that a first loop is obtained by winding the string around three rods, two lower rods and an upper rod, a second loop is obtained by winding the string around three rods, two lower rods and the last upper rod and that the loops are passed one into the other to form a double loop knot. Other advantages and characteristics will emerge more clearly from the description which follows of several alternative embodiments, given by way of nonlimiting examples, of the process for forming a double knot. loop from a string and device implementing the method according to the invention, ^'with reference to the accompanying drawings in which:

FIGS. 1A and 1B are views respectively in elevation and from above of the device for the formation of a double loop knot from a string according to the invention,

FIG. 2 is a partial top view of the device according to the invention, FIG. 3 is a view in longitudinal section of the device according to the invention shown in FIG. 2,

- Figure 4 is a longitudinal sectional view of the gripping means of the device according to the invention, - Figures 5A, 5B, 5C are schematic representations of the device according to the invention shown in Figures 2 and 3 describing the means actuation for ensuring a helical movement of the gripping means of the device, - Figure 6 shows a partial longitudinal sectional view of an alternative embodiment of the device according to the invention,

FIG. 7 is a view in partial longitudinal section of the gripping means of the variant embodiment of the device according to the invention shown in FIG. 6,

- Figure 8 is a partial longitudinal sectional view of a second alternative embodiment of the device according to the invention, - Figure 9 is a partial top view of the second alternative embodiment of the device according to 1 ' invention shown in FIG. 6 without the gripping means,

FIG. 10 is a side view of a gripping means of the device according to the invention,

FIG. 11 is a view in partial longitudinal section of a third alternative embodiment of the device according to the invention, FIG. 12 is a perspective view of a final variant of the device for the formation of a double loop knot according to the invention,

FIG. 13 is a cross-sectional view of the device according to the invention shown in FIG. 10,

- Figures 14A to 14E are schematic representations of the different steps of the method of forming a double loop node according to the invention. With reference to FIGS. 1A and 1B, the device for forming a double loop knot according to the invention comprises a frame 1 constituted by a generally rectangular metal plate on which are mounted on each side of a median plane M of the means gripping means 2 and 2 'and actuating means 3 and 3' of said gripping means 2 and 2 'respectively. A product 4 to be tied is positioned astride the median plane M, a string 5 being positioned around the product 4 so that the two strands 5a, 5b of the string 5 extend generally parallel and vertically on both sides. other of the median plane M. The strands 5a, 5b of the string 5 are advantageously held parallel and vertically on either side of the median plane M by two arms 6 and 6 'integral with the frame 1 and extending generally vertically from the side and on the other side of the median plane M, each arm 6 and 6 ′ comprising a blocking strip 7 and respectively 7 ′ into which the strands 5a and 5b of the string 5 are respectively inserted.

It will be noted that the gripping means 2 'and the actuating means 3' constitute means symmetrical with respect to the median plane M of the gripping means 2 and respectively of the actuating means 3 so that the description will be limited to the description of these for reasons of clarity. In this regard, with reference to Figures 2 and 3, the gripping means 2 consists of a helical rod 8 provided at its free end with a clamp 9 so that the latter is not positioned on the axis of the spiral. Said clamp 9, with reference to FIG. 4, consists of two jaws 10a, 10b connected to a cable 11 extending inside the helical rod 8 which is advantageously hollow. The cable 11 is connected to a jack so that when the cable 11 is stretched, the jaws 10a, 10b generally form inside the helical rod 8 thus closing the clamp, and that, when the cable 11 is released, said jaws 10a, 10b project from the free end of the helical rod 8 thus opening the clamp ready to grip the string 5.

The helical rod 8 is integral with the free end of an axis 12 consisting of a cylindrical bar mounted freely in rotation and in translation between two guides 13 and 14 extending vertically and integral with the frame 1 so that the axis 12 extends generally parallel to said frame 1. The actuating means 3 consist, in addition to the axis 12, in a double-acting cylinder 15 whose rod 16 extends through the guide 13 and is integral with a carriage 17. The latter is positioned between the two guides 13 and 14 and it has a generally U-shaped cross section of which one of the branches is integral with the axis 12 so that the carriage 17 is capable of driving in translation said axis 12, the latter being mounted to rotate freely relative to the carriage 17. The carriage 17 also comprises a rack 18 mounted movable transversely on said carriage 17 relative to the axis 12, that is to say that the carriage is suitable for s e move perpendicular to the axis 12 and cooperating with a toothed pinion 19 integral with said axis 12. The rack 18 is secured to a roller 20 positioned under the carriage 18 and extending inside a groove 21 formed in the frame 1, the roller 19 preferably being mounted idly on the carriage 17 in order to reduce friction on the walls of the groove 21. Said groove 21 comprises a first part 21a extending generally parallel to the axis 12, that is to say parallel to the longitudinal axis of the gripping means 3, and a second part 21b extending at an angle α, preferably less than or equal to 45 ° in order to avoid any blocking of the carriage 17, with respect to said axis 12.

FIGS. 5A to 5C illustrate the operation of the device for the formation of a double loop node previously described. In FIG. 5A, the clamp 9 positioned at the end of the helical rod 8 of the gripping means 2 extends beyond the median plane M in order to engage the strand 5b of the string 5 between the jaws 10a, 10b of said clamp 9. The jack, advantageously secured to the axis 12 tension the cable 11 to close the jaws 10a, 10b of the clamp 9 to grip the strand 5b. The jack 15 is then actuated to move the carriage 17 parallel to the axis 12 to the right, with reference to FIG. 5B, driving the roller 20 in the second part 21b of the groove 21 which displaces the rack 18 transversely. transverse movement of the rack 18 rotates the toothed pinion 19 integral with the axis 12 so that the latter is simultaneously driven in translation to the right, as indicated by arrow a, and in rotation about the axis 12 as shown by arrow b in Figure 5B. The combination of the translational movement and the rotational movement of the axis 12 provides a movement of the gripping means 2 along a helical path until the roller 20 reaches the first part 21a of the groove 20 which extends generally parallel to the axis 12. When the roller 20 reaches the part 21a of the groove 21, the gripping means 2 are driven only in translation as indicated by the arrow c in FIG. 5C until the roller 20 comes into abutment against the end of the part 21a of the groove 20, this position corresponding to the extreme retracted position of the jack 15. The jack V is then actuated in order to relax the cable 11 and allow the jaws 10a, 10b to open of the pliers 9 in order to release the double loop knot thus formed.

We will now explain the different stages of the formation of a double loop knot from a string 5 illustrated in FIGS. 14A to 14E.

With reference to FIG. 14A, the product 4 to be tied being positioned astride the median plane M a string 5 is positioned around the product 4 so that the two strands 5a, 5b of the string 5 extend generally parallel and vertically on either side of the median plane M, said strands 5a, 5b being held by the locking strips 7 and 7 'of the arms 6 and 6' respectively. The gripping means 2 and 2 'extend on either side of the median plane M, respectively to the right and to the left of the latter. The gripping means 2 and 2 ′ are then moved in translation and in rotation as 1 ′ indicate the arrows d, e and d_ | _, e_ in FIG. 14b so that the gripping means 2 and 2 ′ intertwine until 'that the gripping means 2 grip the strand 5b and that the gripping means 2' grip the strand 5a of the string 5

(Figure 14C). The gripping means 2 is then moved along a helical trajectory, that is to say the combination of a translation and a rotation as 1 'indicate the arrows f and g of FIG. 14D, and the gripping means 2 ′ are moved in an opposite direction along a helical path, as indicated by the arrows f ′ and g ′, in order to form two loops Bl and B2 of opposite respective steps which, at the level of the median plane M passes one into the other. The movements of the gripping means 2 and 2 'following helical trajectories and opposite directions up to the gripping position of the opposite strand, with reference to FIG. 14E, then the gripping means 2 and 2' are moved linearly in opposite directions, as indicated by the arrows f and h 'in order to tighten the double loop knot obtained. After tightening the knot, the strands of the string are released, then the product tied with a double loop knot is released, and finally the gripping means 2,2 'are brought back, by a linear movement to their initial position (figure 14A).

We will observe that depending on the length of the strands of string, we will obtain a double loop knot for strands of sufficient length, a simple loop knot if one of the strands is too short or even a flat knot if the strands are too short. According to an alternative embodiment of the device for forming a double loop knot in accordance with the invention, shown in FIG. 6, the gripping means 2 consist of a cylindrical bar 22 comprising a coaxial helical recess 23 and it includes at its free end a hook 24 so that the latter is not positioned on the axis of the helicoid. The cylindrical bar 22 further comprises, in its helical recess 23 a helical groove 25 in which extends a cable 26 whose free ends are respectively secured to a jack V and a finger 27. The finger 27 is secured of the cable 26 connected to the jack V in order to move the finger 27 from a retracted position where the finger 27 extends inside a cavity 28 (FIG. 7) formed inside the cylindrical bar 22 up to a closed position where said finger 27 projects from its housing 28 to close the hook 24 and vice versa.

The cylindrical bar 22 is, moreover, with reference to FIG. 6, secured to the free end of a pin 12 mounted free in rotation and in translation between two guides 13 and 14 secured to the frame 1 and extending generally vertically so that the frame 1 being placed on a generally horizontal surface, the axis 12 extends generally horizontally. In order to actuate the gripping means 2, the axis 12 comprises a lug 29 extending radially and cooperating with a lumen 30 of a tube 31 extending coaxially between the two guides 13 and 14, the axis 12 s 'extending inside said tube 31. The free end of the axis 12 is secured to a transmission bar 32 extending parallel to the axis 12 under the latter by a first connecting piece 33 comprising a bearing with balls 34, the hub 35 of which is integral with the free end of the axis 12, the transmission bar 32 being secured to the connecting piece 33 by a fixed link. It will be noted that the transmission bar 32 prevents the rod 16 of the actuator 15 from supporting the rotational forces generated by the axis 12 and the lug 29 moving in the lumen 30 of the tube 31, and by the formation of the node. The opposite end of the transmission bar 32 is secured by a second connecting piece 36 to the free end of the rod 16 of a double-acting cylinder 15. The rod 16 of said cylinder 15 extends parallel to the axis 12 and to the transmission bar 32 under the latter, the body of said cylinder 15 being, for example, integral with the guides 13 and 14. Furthermore, the lumen 30 of the tube 31 advantageously has a first helical part 30a in its proximal part gripping means 2 and a second linear part 30b where the lumen 30 extends generally parallel to the axis 12 in its distal part so that the actuation of the actuator 15 provides a movement of the gripping means 2 along a path helical then following a straight path.

Furthermore, it is quite obvious that the gripping means 2 which are described in FIGS. 2 and 3 and which consist of a helical rod 8 provided at its free end with a clamp 9 can be positioned at the end of a axis 12 cooperating with the actuating means 3 described in Figure 5 and that the gripping means 2 described in Figure 5 which consist of a cylindrical bar 22 comprising a helical recess 23 coaxial and provided at its free end with a hook 24 can be adapted to the free end of the axis 12 of the actuating means 3 described in Figures 2 and 3 without departing from the scope of the invention. Furthermore, in the variant embodiment of the device described above, the pitch of the helical slot 30a is advantageously equal to the pitch of the helical rod 8 or of the cylindrical bar 22 comprising a coaxial helical recess 23 constituting the gripping means 2.

According to another variant of the device for the formation of a double loop knot according to the invention, represented in FIGS. 8 to 10, the device consists of a tube 37 of generally circular section comprising a central opening 38 and an internal shoulder 39a, 39b on the one hand and on the other side of the central opening 38, the median plane of the tube 37, orthogonal to the longitudinal axis of the latter, corresponds to the median plane M of the device. The latter comprises, with reference to Figures 8 and 10, two identical cylindrical bars 40a, 40b respectively comprising a coaxial helical recess 41a and 41b so that the two bars 40a, 40b are able to engage one in the other. The respective free ends of each cylindrical bar 40a, 40b comprises a hook 42a and respectively 42b and a handle 43a and respectively 43b mounted freely in rotation around the longitudinal axis of each cylindrical bar 40a, 40b. The handles 43a, 43b advantageously comprise lugs 44a and respectively 44b cooperating, when the cylindrical bars 40a and respectively 40b are introduced into the tube 37 while engaging one in the other, with notches 45a, 45b of the end edges of the tube 37 so that the hooks 42a and 42b extend inside the tube 37 symmetrically with respect to the median plane M and that the strands of the string are able to be positioned in said hooks 42a, 42b through the opening 38 of tube 37.

In order to form a double loop knot from the device described above, with reference to Figure 8, the cylindrical bars 40a and 40b extending inside the tube 37 so that they engage one in the other, a first strand of the string is introduced into the hook 42a of the cylindrical bar 40a and the opposite strand of the string is introduced in the opposite direction, passing over the opening 38 of the tube 37, in the hook 42b of the cylindrical bar 40b. The bars 40a and 40b are then moved in opposite directions by means of the handles 43a, 43b to form the double knot loop.

According to a third variant of the device according to the invention, with reference to FIG. 11, the device consists of two identical cylindrical bars 46a and 46b comprising respectively at one of their free ends two flats 47a and respectively 47b passing through the 'respective longitudinal axis of the bars 46a, 46b so that said free ends of said bars are adapted to engage coaxially one in one. Each bar 46a and 46b also comprises, on the side opposite to the flat part 47a and respectively 47b, a hook 48a and 48b so that when said bars are engaged coaxially with one another, said hooks 48a and 48b are extend symmetrically on either side of a median plane M orthogonal to the longitudinal axis of the bars 46a and 46b. In order to block the strands of the twine in the hooks 48a and 48b respectively, each bar 46a, 46b comprises a finger 49a, 49b capable of closing the hook 48a, 48b and secured to a cable 50a, 50b connected to an actuating means not shown in the figures in order to move the finger 49a, 49b inside a cavity 51a, 51b formed inside each bar 46a, 46b to a closed position where said finger projects from its housing 51a, 51b to close the hook 48a, 48b and vice versa. In order to obtain a double loop knot from the device described above, the bars 46a, 46b being engaged one inside the other, a string 5 is positioned in the hook 48b of the bar 46b and then blocked by the finger 49b , then the string 5 is wound around the two bars 46a, 46b in a turn, and finally the free strand of the string 5 is positioned in the hook 48a of the bar 46a to be blocked by the finger 49a. The double loop knot is then obtained by moving the bars 46a, 46b along their longitudinal axes in two opposite directions.

According to a last alternative embodiment of the device according to the invention, with reference to Figures 12 and 13, the latter consists of four rods 52,53,54,55 extending generally parallel to each other, preferably horizontally, forming a parallelogram consisting of two lower rods 52 and 53 and two upper rods 54 and 55 so that a first loop 56 can be obtained by winding a string 5 around the lower rod 53, the upper rod 55 and the lower rod 52, then that a second loop 57 can be obtained by winding the string 5 around the lower rod 53, the upper rod 54 and the lower rod 52, each loop 56 and 57 each extending on one side of a median plane M orthogonal to the rods 52 to 55, that is to say orthogonal to the axes of the loops. The device furthermore comprises means for gripping the loops 56, 57 such as hooks 58 and 59 capable of gripping the loops 56, 57 respectively and passing said loops 56, 57 one inside the other in order to '' get a double loop knot.

To this end, each hook 58, 59 is positioned at the free end of the rod of a jack, not shown in the figures, extending generally parallel to the rods 52 to 55 inside the parallelogram formed by the latter. so that the hooks 58,59 are moved in two opposite directions.

Incidentally, each rod 52,53,54 or 55 is integral with a displacement means, not shown in the figures, capable of moving each rod, 52,53,54 or 55 along the longitudinal axis where the rods 52 to 55 are integral with a single displacement means, not shown in the figures, capable of displacing the rods along their respective longitudinal axes in order to allow the formation of a double loop knot when the loops 56, 57 are placed one in the 'other.

It is obvious that one of the gripping means 2 or 2 ′ described in FIGS. 2, 3 or 6 can consist of a straight rod provided at its end with a hook or a clamp, said clamp being able to engage coaxially in the helical rod 8 or in the cylindrical bar 22 comprising a helical recess of the complementary gripping means 2 ′ or 2 of the device without departing from the scope of the invention.

Finally, it goes without saying that the gripping means and the actuation means of the device for the formation of a double loop knot according to the invention can be substituted by any other equivalent means and that, the examples which are just described are only specific illustrations in no way limiting the fields of application of the invention.

Claims

1 - Method for forming a double loop knot, single loop or a flat knot from a string (5), or the like for tying gift packages, for decoration loops, for knots shoe or the like, characterized in that it consists at least in forming, by rotation, from a piece of string (5), two loops (B1, B2) of respective opposite pitches each extending on one side of a median plane M orthogonal to the axis of the loops (B1, B2) then passing the loops (B1, B2) one inside the other in order to obtain a double loop, single loop or a flat knot.

2 - A method of forming a double loop knot according to the preceding claim characterized in that, the string (5) being positioned around the bundle to be tied so that it forms two strands (5a, 5b) extending generally parallel and vertically on either side of a median plane, it consists at least in the following stages:

- we grab each strand (5a, 5b) of the string (5), then

- each of the strands (5a, 5b) is moved from their respective gripping positions at least to the median plane, at least one of the strands (5a) or (5b) being moved along a generally helical path and the other extending near the axis of the helical path of the first strand (5a) or (5b), then

- each of the strands (5a, 5b) is moved linearly from at least the median plane to the side opposite to the gripping position of the respective strands (5a, 5b), to form and tighten the knot, and finally

- the strands (5a, 5b) of the string (5) are released.

3 - A method of forming a node according to claim 2 characterized in that the strands (5a, 5b) are respectively moved from their gripping position at least to the median plane by following opposite concentric helical paths in direction and in direction.

4 - A method of forming a node according to any one of claims 2 or 3 characterized in that each strand (5a, 5b) is moved from its gripping position to the gripping position of the other strand.

5 - A method of forming a node according to any one of claims 2 to 4 characterized in that the helical trajectory consists in at least one revolution of a turn. 6 - A method of forming a knot according to any one of claims 2 to 5 characterized in that, the string (5) being positioned around the bundle to be tied, an ordinary knot is made beforehand so that the two strands (5a, 5b) of twine (5) extend generally parallel and vertically on either side of the median plane M.

7 - Device for forming a double loop knot, single loop or a flat knot from a string (5) or the like for tying gift packages, for decoration loops, for knots shoe or other, implementing the method according to claim 1 characterized in that it comprises at least four rods (52,53,54,55) extending generally parallel to each other, preferably horizontally, by forming a parallelogram consisting of two lower rods (52,53) and two upper rods (54,55) and in that it comprises at least two gripping means (58,59) able to be moved in opposite directions so that a first loop (56) is obtained by winding the thread (5) on three rods, two lower rods (52,53) and an upper rod (55), ^a second loop (57) is obtained by wrapping the string (5) around three rods, the two rods lower (52,53) and the last upper rod (54) and that the loops (56,57) are passed into each other to form a double loop knot.

8 - Device according to claim 7 characterized in that each rod (52,53,54,55) is integral with a displacement means able to move each rod (52,53,54,55) along its longitudinal axis.

9 - Device according to claim 7 characterized in that the rods (52,53,54,55) are integral with a displacement means adapted to move the rods (52,53,54,55) along their respective longitudinal axes.

10 - Device according to any one of claims 7 to 9 characterized in that each gripping means (58,59) consist of a hook positioned at the free end of the rod of a jack extending generally parallel to the rods (52,53,54,55) inside the parallelogram formed by the latter. 11 - Device for forming a double loop knot, single loop or a flat knot from a string (5) or the like for tying gift packages, for decoration loops, for knots shoes or the like, implementing the method according to any one of claims 1 or 2, characterized in that it comprises at least two gripping means (2,2 ') and actuating means (3,3 ') so that said gripping means (2,2') are moved in two opposite directions and that at least one gripping means (2) or (2 ') is moved along a generally helical path.

12 - Device according to claim 11 characterized in that each gripping means (2,2 ') consists of a helical rod (8) provided at its free end with a clamp (9) consisting of two jaws (10a, 10b) connected to a cable (11) actuated by a jack (V).

13 - Device according to claim 11 characterized in that each gripping means (2,2 ') consists of a cylindrical bar (22) comprising a helical recess (23) coaxial and provided at its free end with a hook (24) .

14 - Device according to claim 13 characterized in that each gripping means (2,2 ') comprises a finger (27) capable of closing the hook (24) and secured to a cable (26) connected to a jack (V) in order to move the finger ( 27) from a retracted position where the finger extends inside a cavity (28) formed inside the gripping means (2,2 ') to a closed position where said finger (27 ) protrudes from its cavity (28) to close the hook (27) and vice versa.

15 - Device according to any one of claims 12 or 13 characterized in that each helical rod (8) or each helical recess (27) has the same pitch so that two helical rods (23) or two cylindrical bars comprising a helical recesses are able to engage one in the other.

16 - Device according to any one of claims 11 to 15 characterized in that the gripping means (2,2 ') are integral with the free end of an axis (12) mounted free in rotation and in translation between two guides (13,14) integral with a frame and in that the actuating means (3,3 ') consist of a jack (15) whose rod (16) is integral with a carriage (17) capable of drive in translation the axis (12) and comprising a rack (18) mounted movable transversely on said carriage (17), a roller (20) extending inside a groove (21) formed in the frame ( 1) being integral with the rack (18) which cooperates with a toothed pinion (19) integral with the axis (12), so that a translational movement of the rod (16) of the jack (15) along the 'axis (12) provides rotation and / or translation of one axis.

17 - Device according to claim 16 characterized in that the groove (21) comprises at least a first part (21a) extending generally parallel to the axis (12) of the gripping means (2,2 ') and a second part (21b) extending at an angle less than or equal to 45 ° relative to said axis (12).

18 - Device according to any one of claims 11 to 15 characterized in that the gripping means (2,2 ') are integral with the free end of a pin (12) mounted free in rotation and in translation between two guides (13,14) integral with a frame and in that the actuation means (3,3 ') consist of a lug (29) integral with the axis extending radially, and cooperating with a helical light (30) of a tube (31) extending between the two guides and in which the axis extends and a jack (15) whose rod (16) is integral with means (32,33,34,35,36) able to move in translation the axis (12).

19 - Device according to claim 18 characterized in that the pitch of the helical light (30) is equal to the pitch of the helical rod (8) or of the cylindrical bar (22) comprising a helical recess (23) of the gripping means (2.2 ').

20 - Device for forming a double loop knot, single loop or a flat knot from a string (5) or the like for tying gift packages, for decoration loops, for knots shoe or other, implementing the method according to any one of claims 1 or 2 characterized in that it consists of a tube (37) of generally circular section comprising a central opening (38), an internal shoulder (39a, 39b) on either side of the central opening and two cylindrical bars (40a, 40b) respectively comprising a coaxial helical recess (41a, 41b) of the same pitch so that the two bars (40a, 40b ) are able to engage one in the other, their respective ends being provided with a hook (42a, 42b) and a handle (43a, 43b) mounted freely in rotation about the longitudinal axis of the bars (40a, 40b).

21 - Device for forming a double loop knot, single loop or a flat knot from a string (5) or the like for tying gift packages, for decoration loops, for knots shoe or other, implementing the following process any one of claims 1 or 2 characterized in that it consists of two bars (46a, 46b) respectively provided at one of their free ends with a flat (47a, 47b) and a hook ( 48a, 48b) so that said free ends of the bars (46a, 46b) are able to engage coaxially with one another so that, the string (5) is positioned in the hook of a first bar (46a), then wrapped around the two bars (46a, 46b), and finally positioned in the hook (48a) of the second bar (46b), the double loop knot is obtained by moving the bars in two opposite directions.