Machine for preassembling and assembling an upper on a shoe-making last

Description

[0001] The present invention relates to a machine for preassembling and assembling an upper on a shoe-making last.

[0002] In the footwear processing sector, machines are known that automatically perform the various processing operations. In general terms, said processing operations comprise: arranging the upper on the shoe-making last after an insole has previously been associated with the sole of the last, gripping the edges of the upper by means of a multiplicity of grippers mounted around the last, stretching the upper on the last by means of a relative displacement between grippers and last, blocking the upper on the last by means of pressure members, applying an adhesive to the edge of the insole, gradually easing the grip of the grippers on the upper and turning the edge of the upper over the edge of the insole, resulting in the adhesive bonding of the edge of the upper to the insole.

[0003] In order for the assembly of the upper on the insole to be performed correctly, the grippers have to be positioned around the last in a manner such that their gripping tips, or more specifically the segments that define the respective gripping portions of the tensioning grippers, are mutually aligned at a predetermined distance from the last, reproducing the profile of the latter and exercising a uniform traction along the entire edge of the upper.

[0004] The tensioning grippers comprise a central gripper positioned in alignment with the front part of the shoe-making last and two respective opposing pluralities of lateral grippers.

[0005] In order to permit the abovementioned positioning, adjusting members are associated with each gripper and make it possible to move the gripper closer to or away from the last. Subsequently, each of said pluralities of lateral grippers is borne by a respective support member which, relative to the bearing structure, is movable along a curved trajectory which encompasses the shoe-making, last, so as better to adjust the positioning of the lateral grippers relative to the specific geometry of the last. This makes it possible to adjust the position of the lateral grippers rapidly to the varying geometries of shoe-making lasts which, as is obvious, vary in accordance with the type of footwear to be produced.

[0006] It is, however, necessary to point out that, as regards the central gripper, if the geometry of the width of the tip of the last is varied, for example by changing to a shape of footwear having a square front end rather than a rounded one, it is necessary to use a gripper of different width. Therefore, when the geometry of the shoe-making last varies, while in the case of the lateral grippers it is sufficient to reposition the respective support member, in the case of the central gripper it becomes necessary to replace said gripper with one of appropriate width.

[0007] That having been said, the complexity of the abovementioned machines and the bulk of all the elements that form them result in a situation where there is insufficient space around the central gripper to be able to operate with a tool, such as a spanner, the use of which becomes necessary in order to carry out operations of loosening and tightening the securing members that lock the central gripper on its support. As a result, before the central gripper can be replaced, it becomes necessary to remove the lateral grippers so as to create the necessary space around the central gripper to operate with the tool, it being impossible to proceed manually without tools.

[0008] The removal of the lateral grippers, or even their mere loosening, entails a subsequent need to adjust the position of the lateral grippers relative to the last. As may easily be deduced, this adjustment has to be performed by trained personnel and takes time, so that it has an adverse impact on the productivity of the machine, partly because it has to be repeated each time the footwear model to be assembled is changed.

[0009] Patent application WO 95/28104 discloses a pulling over and toe lasting machine having a central toe gripper, which is mounted on a base plate, lateral toe grippers and lateral grippers. The lateral toe grippers are supported by a support plate which is pivotally mounted on the base plate, whereas the lateral grippers are supported by a different support plate which is in turn pivotally mounted on the former support plate. The support plates can be actuated to position the toe lateral grippers and the lateral grippers in a desired relationship with the central gripper and to each other. This machine has the drawback that a removal of the lateral grippers, both toe lateral grippers and lateral grippers, is needed to allow the operator to carry out operations of loosening and/or tightening of the securing members that lock the central gripper. Such an operation is necessary to remove the central gripper in case the last has to be substituted with another one having a toe of different shape and width. Moreover, should the operator remove the lateral grippers, a subsequent need of adjusting the lateral grippers position relative to the last would be necessary, with a consequent loosing of time.

[0010] From the above it is evident that, within the footwear sector, there is a greatly felt need to be able to undertake the replacement of the central gripper simply and quickly, without the need to use specialized personnel.

[0011] It is an object of the present invention to devise a machine for the preassembly and assembly of an upper on a shoe-making last which possesses structural and functional features such as to meet the above requirement and, at the same time, eliminates the disadvantages to which reference has been made.

[0012] This object is achieved by a machine for the preassembly and assembly of an upper on a shoe-making last in accordance with Claim 1, which makes it possible to create rapidly a sufficient space around the central gripper to operate with a tool so as to permit easy replacement thereof, depending on the type of footwear.

[0013] Further features and the advantages of the machine according to the present invention will become apparent from the description given below of a preferred example of embodiment thereof, given by way of indication and without implying limitation, with reference to the attached figures, in which:

Figure 1 shows a diagrammatic perspective view of the working zone of a machine according to the invention for the preassembly and assembly of an upper on a shoe-making last;

Figure 2 shows a simplified plan view of Figure 1;

Figure 3 shows a perspective view in partial section of a detail of the machine according to Figure 1;

Figure 4 shows a lateral view in section of Figure 3;

and Figure 5 shows a lateral view of a detail of the machine according to Figure 1.

[0014] With reference to the attached figures, 1 globally designates a machine according to the invention for the preassembly and assembly of an upper on shoe-making last 3, with the sole of which an insole has been associated.

[0015] The machine 1 comprises a bearing structure 9 to which is fixed a support 4 having a triangular upper surface of limited extent on which the last 3 is intended to bear in alignment with its front part, in other words with its sole.

[0016] The last 3 is supported from below by the triangular surface of the support 4, in a manner such as to present the upper 2 facing upwards, and is positioned in a manner such as to extend from a rear part to a front part along a longitudinal axis (L-L).

[0017] The triangular surface of the support 4 is inclined so that its perpendicular, marked Z-Z, is subvertical and substantially coincides with the line of sight of an operator who, standing in front of the machine 1, is observing the upper surface of said support 4.

[0018] The machine 1 comprises an upper pushing device 7, two opposed lateral pushing devices, both marked 8, and a rear pushing device, not shown in the figures, which are intended to engage respectively with the back, the sides and the heel of the last 3, so as to keep said last in pressing contact against the triangular surface of the support 4 and substantially immobilized in the working position.

[0019] The machine 1 is equipped with tensioning grippers, marked 5, 10 and 11, able to engage the edge of the upper 2 and to pull said upper 2, causing it to adhere to the last 3. The abovementioned tensioning grippers are positioned around the support 4 in a manner such as to be substantially facing the contour of the front part of the sole of the last 3, positioned on the support 4.

[0020] The grippers 5, 10 and 11 are of the type described and illustrated in the same applicant's document EP 0 582 027-B1. Each gripper comprises a body which is provided at the upper end with two jaws 33 and is fixed at the lower end to a manipulating rod 12 by means of two arms (not shown) which define a parallelogram linkage system making it possible to cause the opening and closing movements of the jaws 33. Each gripper is selectively controlled for opening and closing, and can be selectively displaced in the direction Z-Z by means of appropriate actuating means, so as to obtain the desired tensioning of the leather of the upper 2 on the last 3.

[0021] The tensioning grippers comprise a central gripper 5 positioned along the longitudinal axis L-L in alignment with the front part of the shoe-making last 3 and a first plurality and a second plurality of lateral grippers, respectively marked 10 and 11, opposite one another relative to the longitudinal axis L-L. As stated above, the grippers 5, 10 and 11 are positioned in a manner such as to surround the contour of the front part of the sole of the shoe-making last 3.

[0022] The lateral grippers 10 of the first plurality (that on the left in Figure 2) and the lateral grippers 11 of the second plurality (that on the right in Figure 2) are mounted on the support member, respectively marked 13 and 14 and movable relative to the bearing structure along a curved trajectory T which encompasses the support 4 on which the shoe-making last 3 is positioned. This makes it possible to adjust the positioning of the lateral grippers 10 and 11 of each plurality to the geometry of the shoe-making last 3. In substance, by moving each support member 13 and 14, it is possible to obtain a simultaneous displacement of all the lateral grippers, 10 and 11 respectively, associated therewith.

[0023] In the example, each support member 13, 14 takes the specific form of a substantially flat and rectangular supporting base 15, from the central portion of which extends a vertical wall 16. From the upper end of the vertical wall 16, a bracket 18 extends substantially parallel to a portion of the underlying supporting base 15. The bracket 18, the vertical wall 16 and the supporting base portion covered by the bracket 18 define a C-shaped structure. The two support members 13, 14 are disposed in a manner such as to present the respective C-shaped structures facing one another and extending in the direction of the longitudinal axis L-L of the machine 1. In substance, the C formed by each support member 13, 14 is facing the support 4 on which the last 3 is positioned.

[0024] The bracket 18 and the underlying portion of the supporting base 15 of each support member 13, 14 are provided with appropriate respective pluralities of through-holes, one above the other, through which extend the rods 12 on whose upper ends the tensioning grippers 10 and 11 are fixed. Connected to the lower end of each rod 12 is a pneumatic cylinder 19 whereby the vertical movement of said grippers is obtained, intended to ensure the correct tensioning of the upper 2.

[0025] As is apparent from Figure 3, in which only the support member 13 (that on the left in Figure 2) is shown, the support member 13 provides operational support for four lateral grippers 10, and an equal number of lateral grippers 11 are supported by the support member 14.

[0026] Each support unit 13, 14 bears, with its base 15, on a working level 6 of the bearing structure 9 disposed perpendicularly to the abovementioned direction Z-Z. The working level 6 is thus substantially parallel to the sole of the shoe-making last 3. Alternatively, the working level 6 may be replaced by a plurality of crosspieces.

[0027] According to an advantageous feature, at least one support member 13, 14, and both in the example shown, is or are mounted on a respective trolley or slide 20, 21, which is movable from and to a remote position in which the respective pluralities of lateral grippers 10, 11 is at a distance from the central gripper 5.

[0028] When the two trolleys 20, 21 are in the remote position, a sufficient space is created around the central gripper 5 to manipulate a tool, such as for example a manipulating spanner for loosening the bolts which provide the tightening of the central gripper 5 on the rod 12.

[0029] The machine 1 comprises means for actuating the two trolleys 20, 21 from and to the remote position, in other words from an advanced operating position, in which the lateral grippers 10, 11 are positioned close to the last 3 to a remote position and vice-versa. Preferably, the movement of the two trolleys 20, 21 takes place simultaneously. In this respect, it must be specified that Figure 2 refers to a plan view of the zone of the machine 1 in which the grippers 5, 10, 11, the support members 13, 14 and the two trolleys 20, 21 are present. However, simply for purposes of illustration, the right-hand half of Figure 2 refers to a situation in which the trolley 21 associated with the support member 13 is in the remote position, while in the left-hand half of the same Figure 2 the trolley 20 associated with the support member 14 is shown in the advanced, operating position.

[0030] Each trolley 20, 21 performs the displacement from the advanced, operating position (shown in the left-hand half of Fig. 2) to the remote position (shown in the right-hand half of Fig. 2) with a movement having a displacement component transverse to the longitudinal axis L-L. Preferably, this displacement consists of a translatory movement of each of the two trolleys 20, 21 in a direction X-X perpendicular to the longitudinal axis L-L. In substance, the two trolleys 20, 21, during the movement, move away from or towards one another.

[0031] As will be more clearly apparent from the continuation of the description, the translatory movement proves to be advantageous to implement from the standpoint of the structural simplicity of the machine 1, though it is possible to impose a rotational or rotational/translatory movement on the two trolleys 20, 21 or, more specifically, on the support members 13 and 14 of the lateral grippers 10, 11. In a further alternative embodiment, it is possible to provide a movement of the support members 13, 14 of the lateral grippers 10, 11 in a vertical direction or in the abovementioned direction Z-Z.

[0032] In the example shown, each trolley takes the specific form of a plate supported by and shape engaged with sliding guides 22, which extend in the abovementioned direction X-X below the working level 6 and are supported by the bearing structure 9 of the machine 1.

[0033] Each support member 13, 14 is connected to the respective trolley 20, 21 by means of two bolts 23 having the threaded shank extending in the direction Z-Z. In order to permit movement of the support member 13, 14 relative to the trolley 20, 21 along the curved trajectory T encompassing the support 4 and the last 3, slots 24 are provided in the base 15 of each support member 13, 14, extending along the abovementioned trajectory T, through which slots the shank of a respective bolt 23 extends. Alternatively, the slots 24 may be replaced by a slit of greater length.

[0034] By analogy with what has been described above, slots 25 are made in alignment with the bolts 23 in the working level 6, through which slots the shanks of the bolts 23 extend. The slots 25 extend in the transverse direction X-X. Clearly, the length of the slots and their positioning is such as to allow each trolley 20, 21 the possibility of movement in the manner described above between the advanced, operating position and the remote position, and vice-versa, without the shanks of the bolts 23 interfering with the working level 6.

[0035] In the example, the means for actuating the trolleys 20, 21 comprise a threaded bar 26 extending in said transverse direction X-X and pivotably supported in rotation by the bearing structure 9. This threaded bar 26 is kinematically associated with an electric motor (not shown) for the rotational actuation thereof and is in screw/nut engagement with a portion, or appendage 27, of each of said trolleys 20, 21. Consequently, one rotation of the threaded bar 26 produces to a translatory movement of the trolleys 20, 21 along the sliding guides 22.

[0036] It is appropriate to point out that, in order to obtain simultaneous movement together or apart of the two trolleys 20, 21, it is necessary for the threaded bar 26 to have two threaded lengths with opposing threads (right-hand and left-hand), the first of these threaded lengths being in screw/nut engagement with the threaded appendage 27 of the trolley 20 and the other threaded length being in screw/nut engagement with the threaded appendage 27 of the trolley 21.

[0037] The kinematic connection between the shaft of the electric motor and the threaded bar 26 is produced by means of a chain transmission comprising a chain 28 engaging with two pinions 29, 30 respectively keyed on the threaded bar 26 and on the shaft of the electric motor.

[0038] The actuation of the support members 13, 14 along the curved trajectory T is obtained by virtue of respective actuating cylinders, for example of the pneumatic type, which act directly on the base 15 of the support members 13, 14 by means of a manipulating rod 31.

[0039] The machine 1 further comprises means for folding the edge of the upper 2 over onto the sole of the shoe-making last 3, and means for pressing the folded-over edge of the upper 2 from below against the insole, following application of adhesive along the edge of the insole.

[0040] In the example shown, the abovementioned means for folding over the edge of the upper 2 comprise two plates 17, curved so as to encompass the profile of the tip of the last 3 and movable towards said last 3, while the abovementioned means for pressing comprise a plurality of rod-like elements 32 that are movable towards the last 3 in a manner such as to engage it from below with a predetermined elastic force.

[0041] The machine 1 is equipped with means 34 for distributing the adhesive along the contour of the sole of the insole associated with the last 3.

[0042] The machine 1 is additionally equipped with actuating means, regulating and monitoring means, control means and others also necessary to ensure the correct functioning thereof during its working cycle. Such means are known per se and are not described below or shown in the figures.

[0043] As may be appreciated from the above description, the machine according to the invention for the preassembly and assembly of an upper on a shoe-making last makes it possible to meet the above requirement and, at the same time, to overcome the disadvantages to which reference was made in the introductory part of the present description.

[0044] Specifically, when it is necessary to replace the central gripper of the machine, it is sufficient to reverse the two trolleys from the latter into the remote position in order to create the necessary space around the central gripper 5 to operate with a manipulating spanner on the bolts that ensure the tightening of the said gripper. It should be pointed out that the reversing movement and the subsequent placement of the abovementioned trolleys in the operating position, and hence also that of the respective lateral grippers associated therewith, does not in any way entail the loss of the position of said lateral grippers, any subsequent adjustment being unnecessary.

[0045] Yet a further advantage of the machine according to the invention lies in the structural simplicity of the structural solution adopted.

[0046] Clearly, a person skilled in the art, in order to meet contingent and specific requirements, will be able to introduce numerous modifications and variations into the machine described above for the preassembly and assembly of an upper on a shoe-making last, all of these, however, being contained within the scope of protection of the invention as defined by the claims that follow.

Claims

1. Machine (1) for preassembling and assembling an upper (2) on a shoe-making last, comprising a bearing structure (9) with which are associated:

- support means (4) for positioning, along a longitudinal axis (L-L) a shoe-making last (3) extended between a front part and a rear part and on which an upper (2) is supported;

- means (7, 8) for engaging the shoe-making last (3) and locking it relative to said support means (4);

- tensioning grippers (5 , 10, 11) to engage the edge of the upper (2) and to pull said upper (2), causing it to adhere to the shoe-making last (3), said tensioning grippers (5. 10, 11) being positioned around said support means (4) in a manner such as to be substantially facing the contour of the sole of the last (3), said tensioning grippers comprising a central gripper (5) positioned in alignment with the front part of the shoe-making last (3) and lateral grippers (10, 11) opposite one another relative to said longitudinal axis (L-L),

- actuating means (19) for actuating the tensioning grippers,

- support members (13, 14) for supporting said lateral grippers (10, 11), said support members (13, 14) being movable relative to the bearing structure (9) along a trajectory encompassing said support means (4), in order to adjust the positioning of the lateral grippers to the geometry of the last (3);

- further actuating means (31) for actuating the support members (13, 14),

- means (17) for folding over the edges of the upper (2) ;

characterized in that:

- said support members (13,14) comprise a first support member (13) for supporting all the lateral grippers (10) positioned on a side relative to said longitudinal axis (L-L) and an opposite second support member (14) for supporting all the lateral grippers (11) positioned on the opposite side relative to said longitudinal axis (L-L),

at least one of said first (13) and second (14) support members being mounted on a trolley (20,21) movable from an operating position to a remote position and vice-versa, in said operating position the respective all lateral grippers (10, 11) being positioned close to the last (3), and in said remote position the respective all lateral grippers (10, 11) being spaced apart from the central gripper (5) so as to create a sufficient space for a tool to be manipulated around the central gripper (5).

2. Machine (1) according to Claim 1, in which both the support members (13, 14) are mounted on a trolley, which is movable from and to a remote position in which the respective plurality of lateral grippers (10, 11) is at a distance from the central gripper (5).

3. Machine (1) according to Claim 1 or 2, in which the displacement of said trolley (20, 21) from and to the remote position takes place with a movement having a displacement component (A) transverse to said longitudinal axis (L-L).

4. Machine (1) according to Claim 3, in which the displacement of said trolley (20, 21) from and to the remote position comprises a translatory movement in a direction (X-X) transverse to said longitudinal axis (L-L) .

5. Machine (1) according to Claim 4, in which said trolley (20, 21) is slidingly supported by sliding guides (22) borne by the bearing structure (9).

6. Machine (1) according to Claim 5, in which said means for actuating said trolley (20, 21) comprise a threaded bar (26) extending in said transverse direction (X-X) and pivotably supported in rotation by said bearing structure (9), said threaded bar (26) being kinematically associated with an electric motor for the rotational actuation thereof and being in nut/screw engagement with a portion (27) of said trolley (20, 21), one rotation of the threaded bar (26) producing a translatory movement of the trolley (20, 21) along the sliding guides (22).

7. Machine (1) according to Claim 1, in which said support member (13, 14) and said trolley (20, 21) are connected by means of bolts (23) solidly fixed to the trolley (20, 21), a slot (24) being provided in the support member in alignment with each bolt (23) and able to permit a relative movement of the support member (13, 14) relative to the bolt (23) along said curved trajectory (T) .

8. Machine (1) according to Claim 7, in which between said support member (13, 14) and said trolley (20, 21) is interposed a portion (6) of said bearing structure (9) in which apertures (25) are made for the passage of said bolts, said apertures (25) being sufficiently extended to permit the movement of the bolts (23) together with the trolley (20, 21) during the movement of the latter from and to the remote position.

9. Machine (1) according to Claim 1, in which said means for the positioning of a shoe-making last (3) comprise a support (4) capable of supplying a resting surface for the sole of the shoe-making last (3), the shoe-making last (3) being supported from below in a manner such as to present the upper (2) facing upwards.

10. Machine (1) according to Claim 1, in which said support member (13, 14) is movable relative to the bearing structure (9) along a curved trajectory (T) encompassing said support means (4).

Ansprüche

1. Maschine (1) zum Vormontieren und Montieren eines Obermaterials (2) auf einen Schuhleisten, umfassend eine Tragstruktur (9), der Folgendes zugeordnet ist:

- Haltemittel (4) zum Positionieren eines Schuhleistens (3) welcher sich zwischen einem vorderen Teil und einem hinteren Teil erstreckt und auf welchem ein Obermaterial (2) gehalten ist, entlang einer Längsachse (L-L);

- Mittel (7, 8) zum Angreifen an dem Schuhleisten (3) und Feststellen desselben relativ zu den Haltemitteln (4);

- Spanngreifer (5, 10, 11) zum Angreifen am Rand des Obermaterials (2) und zum Ziehen des Obermaterials (2), um es mit dem Schuhleisten (3) zu verkleben, wobei die Spanngreifer (5, 10, 11) so um die Haltemittel (4) herum angeordnet sind, dass sie der Kontur der Sohle des Leistens (3) im Wesentlichen gegenüberliegen, wobei die Spanngreifer einen zentralen Greifer (5), der in Ausrichtung mit dem vorderen Teil des Schuhleistens (3) positioniert ist, und seitliche Greifer (10, 11), welche einander relativ zu der Längsachse (L-L) gegenüberliegen, umfassen,

- Betätigungsmittel (19) zum Betätigen der Spanngreifer,

- Halteglieder (13, 14) zum Halten der seitlichen Greifer (10, 11),

wobei die Halteglieder (13, 14) relativ zu der Tragstruktur (9) entlang einer die Haltemittel (4) umschließenden Bahn bewegbar sind, um die Positionierung der seitlichen Greifer auf die Geometrie des Leistens (3) einzustellen;

- weitere Betätigungsmittel (31) zum Betätigen der Halteglieder (13, 14),

- Mittel (17) zum Umschlagen der Ränder des Obermaterials (2);

dadurch gekennzeichnet,

- dass die Halteglieder (13, 14) ein erstes Halteglied (13) zum Halten aller seitlichen Greifer (10), welche auf einer Seite relativ zu der Längsachse (L-L) positioniert sind, und ein gegenüberliegendes zweites Halteglied (14) zum Halten aller seitlichen Greifer (11), welche auf der gegenüberliegenden Seite relativ zu der Längsachse (L-L) positioniert sind, umfassen,

wobei mindestens eines der beiden Halteglieder (13, 14) auf einem Wagen (20, 21) montiert ist, der aus einer Betriebsposition in eine entfernte Position und umgekehrt bewegbar ist, wobei in der Betriebsposition jeweils alle seitlichen Greifer (10, 11) in der Nähe des Leistens (3) positioniert sind und in der entfernten Position jeweils alle seitlichen Greifer (10, 11) von dem zentralen Greifer (5) beabstandet sind, so dass ausreichend Raum für ein zu manipulierendes Werkzeug um den zentralen Greifer (5) herum geschaffen wird.

2. Maschine (1) nach Anspruch 1, wobei beide Halteglieder (13, 14) auf einem Wagen montiert sind, der aus einer und in eine entfernte Position, in der die jeweiligen mehreren seitlichen Greifer (10, 11) in einem Abstand von dem zentralen Greifer (5) angeordnet sind, bewegbar ist.

3. Maschine (1) nach Anspruch 1 oder 2, wobei die Verschiebung des Wagens (20, 21) aus der und in die entfernte Position mit einer Bewegung stattfindet, die eine zu der Längsachse (L-L) transversale Verschiebungskomponente (A) aufweist.

4. Maschine (1) nach Anspruch 3, wobei die Verschiebung des Wagens (20, 21) aus der und in die entfernte Position eine translatorische Bewegung in einer zu der Längsachse (L-L) transversalen Richtung (X-X) umfasst.

5. Maschine (1) nach Anspruch 4, wobei der Wagen (20, 21) durch von der Tragstruktur (9) getragene Gleitführungen (22) gleitbeweglich gehalten ist.

6. Maschine (1) nach Anspruch 5, wobei die Mittel zum Betätigen des Wagens (20, 21) eine Gewindestange (26) umfassen, welche sich in der transversalen Richtung (X-X) erstreckt und drehbar in Rotation von der Tragstruktur (9) gehalten ist, wobei die Gewindestange (26) kinematisch einem Elektromotor für ihre rotatorische Betätigung zugeordnet ist und in Mutter/Schraub-Verbindung mit einem Bereich (27) des Wagens (20, 21) steht, wobei eine Rotation der Gewindestange (26) eine translatorische Bewegung des Wagens (20, 21) entlang den Gleitführungen (22) erzeugt.

7. Maschine (1) nach Anspruch 1, wobei das Halteglied (13, 14) und der Wagen (20, 21) mittels fest an dem Wagen (20, 21) befestigten Bolzen (23) verbunden sind, wobei das Halteglied mit einem Schlitz (24) versehen ist, der in Ausrichtung mit jedem Bolzen (23) steht und eine Relativbewegung des Halteglieds (13, 14) relativ zu dem Bolzen (23) entlang der gekrümmten Bahn (T) erlauben kann.

8. Maschine (1) nach Anspruch 7, wobei zwischen dem Halteglied (13, 14) und dem Wagen (20, 21) ein Bereich (6) der Tragstruktur (9) zwischengeschaltet ist, in dem Öffnungen (25) für die Passage der Bolzen hergestellt sind, wobei die Öffnungen (25) ausreichend ausgedehnt sind, um die Bewegung der Bolzen (23) zusammen mit dem Wagen (20, 21) während der Bewegung des Letzteren aus der und in die entfernte Position zu erlauben.

9. Maschine (1) nach Anspruch 1, wobei die Mittel zum Positionieren eines Schuhleistens (3) Haltemittel (4) umfassen, welche dazu in der Lage sind, eine Auflagefläche für die Sohle des Schuhleistens (3) bereitzustellen, wobei der Schuhleisten (3) von unten so gehalten wird, dass er das Obermaterial (2) nach oben weisend präsentiert.

10. Maschine nach Anspruch 1, wobei das Halteglied (13, 14) relativ zu der Tragstruktur (9) entlang einer gekrümmten Bahn (T), welche die Haltemittel (4) umschließt, bewegbar ist.

Revendications

1. Machine (1) de préassemblage et d'assemblage d'une tige (2) sur une forme de chaussure, comprenant une structure portante (9) à laquelle sont associés :

des moyens de support (4) pour positionner, le long d'un axe longitudinal (L-L), une forme de chaussure (3) s'étendant entre une partie frontale et une partie arrière et sur laquelle une tige (2) est supportée ;

des moyens (7, 8) pour venir au contact de la forme de chaussure (3) et la bloquer par rapport auxdits moyens de support (4) ;

des pinces de serrage (5, 10, 11) pour venir au contact du bord de la tige (2) et pour tirer ladite tige (2), la faisant adhérer à la forme de chaussure (3), lesdites pinces de serrage (5, 10, 11) étant positionnées autour desdits moyens de support (4) de manière à être sensiblement face au contour de la semelle de la forme (3), lesdites pinces de serrage comprenant une pince centrale (5) alignée sur la partie frontale de la forme de chaussure (3) et des pinces latérales (10, 11) opposées l'une à l'autre par rapport audit axe longitudinal (L-L),

des moyens de commande (19) pour commander les pinces de serrage,

des organes supports (13, 14) pour supporter lesdites pinces latérales (10, 11), lesdits organes supports (13, 14) se déplaçant par rapport à la structure portante (9) le long d'une trajectoire englobant lesdits moyens de support (4), afin d'ajuster le positionnement des pinces latérales par rapport à la géométrie de la forme (3) ;

d'autres moyens de commande (31) pour commander les organes supports (13, 14) ;

des moyens (17) pour replier les bords de la tige (2) ;

caractérisé en ce que lesdits organes supports (13, 14) comprennent un premier organe support (13) pour supporter toutes les pinces latérales (10) positionnées d'un côté dudit axe longitudinal (L-L) et un second organe support (14) opposé pour supporter toutes les pinces latérales (11) positionnées du côté opposé audit axe longitudinal (L-L),
au moins l'un desdits premier (13) et second (14) organe support étant monté sur un chariot (20, 21) mobile entre une position opérationnelle et une position éloignée et vice-versa, dans ladite position opérationnelle, toutes les pinces latérales respectives (10, 11) étant positionnées à proximité de la forme (3) et dans ladite position éloignée, toutes les pinces latérales respectives (10, 11) étant écartées de la pince centrale (5) de manière à ménager un espace suffisant pour utiliser un outil autour de la pince centrale (5).

2. Machine (1) selon la revendication 1, dans laquelle les deux organes supports (13, 14) sont montés sur un chariot, se déplaçant de et vers la position éloignée, où la pluralité respective des pinces latérales (10, 11) se trouve à une certaine distance de la pince centrale (5).

3. Machine (1) selon la revendication 1 ou 2, dans laquelle le déplacement dudit chariot (20, 21) de et vers la position éloignée se fait par un mouvement à composante de déplacement (A) transversale par rapport audit axe longitudinal (L-L).

4. Machine (1) selon la revendication 3, dans laquelle le déplacement dudit chariot (20, 21) de et vers la position éloignée comprend un mouvement de translation dans une direction (X-X) transversale par rapport audit axe longitudinal (L-L).

5. Machine (1) selon la revendication 4, dans laquelle ledit chariot (20, 21) est supporté en coulissement par des glissières coulissantes (22) supportées par la structure portante (9).

6. Machine (1) selon la revendication 5, dans laquelle lesdits moyens de commande dudit chariot (20, 21) comprennent une tige filetée (26) s'étendant dans ladite direction transversale (X-X) et supportée en pivotement lors de la rotation par ladite structure portante (9), ladite tige filetée (26) étant associée cinématiquement à un moteur électrique pour la faire tourner et étant en contact avec une partie (27) dudit chariot (20, 21) par un écrou, une rotation de la tige filetée (26) produisant un mouvement de translation du chariot (20, 21) le long des glissières coulissantes (22).

7. Machine (1) selon la revendication 1, dans laquelle ledit organe support (13, 14) et ledit chariot (20, 21) sont reliés par des boulons (23) solidement fixés au chariot (20, 21), une fente (24) étant aménagée dans l'organe support de manière à être alignée sur chaque boulon (23) et permettant un mouvement relatif de l'organe support (13, 14) par rapport au boulon (23) le long de ladite trajectoire incurvée (T).

8. Machine (1) selon la revendication 7, dans laquelle une partie (6) de ladite structure portante (9) est interposée entre ledit organe support (13, 14) et ledit chariot (20, 21), où des ouvertures (25) sont pratiquées pour le passage desdits boulons, lesdites ouvertures (25) étant suffisamment étendues pour permettre le déplacement des boulons (23) avec le chariot (20, 21) au cours de son déplacement de et vers la position éloignée.

9. Machine (1) selon la revendication 1, dans laquelle lesdits moyens de positionnement d'une forme de chaussure (3) comprennent un support (4) capable de fournir une surface d'appui pour la semelle de la forme de chaussure (3), la forme de chaussure (3) étant supportée par-dessous de manière à présenter la tige (2) face orientée vers le haut.

10. Machine (1) selon la revendication 1, dans laquelle ledit organe support (13, 14) se déplace par rapport à la structure portante (9) le long d'une trajectoire incurvée (T) englobant lesdits moyens de support (4).

Drawing