ES2254097T3 - PROCEDURE FOR THE REMOVABLE FIXING OF TEMPLATES TO CORRESPONDING HORMES THROUGH A STRIP OF ADHESIVE TAPE AND DEVICE TO CARRY OUT THE PROCEDURE. - Google Patents

Abstract

Procedure for the removable fixing of templates to corresponding lasts by means of strips of adhesive tape, characterized by: - the vertical placement of said adhesive tape (1) by its downward movement; - the centering of a template (100) in adhesion on the surface of a corresponding last (200) and the maintenance of the positioning of the last-template assembly by an operator, which only supports the ends of said set, that is, the tip and the heel; - causing the assembly, only by a movement of the operator's arms, to contact transversely with a strip (15) obtained from said adhesive tape; - establishing the adhesion of said adhesive strip (15) to said template (100) and bending the ends (15A) of said strip (15) on the edges (F) of the last (200).

Description

Procedure for removable fixation of templates to corresponding lasts using a strip of tape adhesive and device to carry out the procedure.

The present invention relates to procedures to attach templates to corresponding lasts and devices to carry out the procedures.

Shoes are obtained by joining more parts, more precisely at least one top, one template and one corresponding bottom (or sole).

You get a shoe called "mounted" preparing an open top, fixing a template to the lower surface, or sole, of a corresponding last, placing the top on the last, fixing the edge of the top of the template and finally, setting the part Bottom to top.

Suitable fixing means are used (for example nails or claws) to fix the template to the sole in a last.

Next, a layer of adhesive is applied to the edge of the template, the top is placed on the last, the edge of the top is folded and held down, according to known techniques, against the template, so that join together.

After joining the upper part to the template, the top-template set obtained from This way is removed from the last. During the withdrawal, the media fixing must remain fixed to the sole of the last.

In some cases, a fixing element (nail or claw) can still be fixed to the template after completing the shoe, causing unwanted discomfort to the user of the shoe.

Such disadvantage results in claims by customers to the producer, causing economic penalties to signatures that produce the part set top-template. EP 0937419 and US 3107376 give know a different procedure based on the use of a adhesive strip

In these cases, the template is fixed to the last using at least one strip of adhesive tape 15 (see Figure 6).

When the template is placed correctly with respect to the sole in the last, the strip of adhesive tape 15 adheres to the sides F of the anterior part of the last 200 and to the inside front "Ai" (or tip) of the template 100, as shown in Figure 6 (template and last for production of shoes for children).

In the event that a shoe is required for adults, the template 100 is fixed to the last 200 with two strips corresponding of adhesive tape 1a and 1b, respectively; a first strip of adhesive tape 1a, as already described, fixed the previous part of the last to the template, a second strip of Adhesive tape 1b is attached to the sides F of the back "Pi" from the last and to the lower back Pt (or heel) of template 100, as shown in Figure 7.

The technical solution described above avoids the problem of fixing means, which can remain attached to the template during the removal of the part set top-template.

In fact, after fixing the template to the last, a top part is fixed, according to known techniques, to the template so that you get a part set top-template.

Then the part set upper-template obtained in this way is removed of the last and, during withdrawal, the cutting edge Y of the template 100 cuts the strip of adhesive tape in the region of the part that touches the cutting edge indicated above.

Consequently, a part of the adhesive strip remains attached to the bottom of the template, while the other parts, that is, those attached to the F sides of the last, follow attached to it.

A known device allows the strip to be applied of adhesive tape to the bottom of a template, so that fixed it to the respective last.

The device indicated above includes two stations, each of which includes pincers, first and second, respectively.

At first, the first pincer of the first station takes the free end of the adhesive tape, moving to the second station together with said adhesive tape.

The second pincer of the second station, in stage relationship with the transfer of the first pincer, follows a alternative path, so that it is positioned in the first station and take the adhesive tape fixing it in the first station; of this mode, the length of adhesive tape to be applied is determined.

Simultaneously, the operator sets the last, with its sole turned upwards, to a column, then places the template on the sole in the last and then place the last with the template below the adhesive tape, so that the last come in contact with the adhesive tape.

After the template and the adhesive tape come into mutual contact, a main pad is placed, which It is located on the adhesive tape, with pressure on the part upper strip of adhesive tape, so that it adheres to the template.

Then, a blade cuts the adhesive strip on the region of the first station, defining the strip of tape adhesive to fix and, in relation to stage, the pincer of the second station opens, thereby releasing the adhesive tape.

Two additional pads, located next to the main pad, act along directions inclined, convergent downwards, so that they are tucked and fixed the edges of the strip of masking tape along the sides of the last.

Then the operator removes the set of template-last-strip column.

One of the disadvantages of fixing the template to the last using a strip of adhesive tape, if carried out manually, derives from the fact that the quality of the fixation it depends on the skill of the operator and can be influenced negatively because of the tiredness of it.

Another disadvantage results from the time required to carry out the previous fixation, more precisely, the time required to find the correct template 100 position with respect to last 200, the time required to cut the strip of roll tape and the time required for the operator to apply the strip to the bottom of the template so that the set to last.

The above stated disadvantages of fixing the template to the last using the device described, derive from the fact that the constructive characteristics of the latter complicate and retard the placement of the last by under the adhesive tape and control the movement of the first and second tongs needed to take and pull the tape adhesive

There are other devices that work like the previous device, that is, they place the strip horizontally of right to left, or vice versa; this does not allow to apply the strip to the last because the operator holds the set with his hands by its ends, that is, by the heel and the toe.

The object of the present invention is to propose a new and original procedure to removably fix a template to a corresponding last using a strip of tape adhesive

Another object of the present invention is to propose a device for fixing templates to respective lasts by a strip of adhesive tape, which avoids the disadvantages previously described, and in which in particular it facilitates the operator the placement of the sole on the last, and also simplifies and also accelerates the fixing of the template to the last with the strip of Scotch tape.

A further object of the present invention is propose a device whose structure allows cutting the tape adhesive at a predetermined point, so that it defines the length correct adhesive strip and ensure optimal fixation of the Template to last.

Still another object of the present invention is propose a device, for the use of which the operator can keep your hands on the last during the application of the strip to the same.

The aforementioned objects are achieved according to the claims.

The characteristic elements of the present invention in the following description of a form of preferred embodiment, although not limiting, with reference to attached drawings, in which:

- Figure 1 is a side view of the device proposed by the invention for fixing templates to respective lasts;

- Figures 1a and 1b are enlarged views of the element K of Figure 1, showing two working positions from the pincer taking an adhesive tape;

- Figure 2 is the same view as Figure 1 with the bottom dead center of the clamp adhesive;

- Figure 3 is a view of a section taken along line III-III of Figure 2, in which some parts have been removed to indicate others;

- Figure 4 is an enlarged view of a part of the device shown in Figure 1, which indicates the position of Adhesive tape, template and last during one stage of work;

- Figure 4a is an enlarged view of the element W of Figure 4;

- Figure 5 is a view of a stage of operation after the one shown in Figure 4;

- Figures 6 and 7 illustrate details indicated in the introductory sentences;

- Figure 8 is the same view as Figure 2, which points out some constructive variants;

- Figures 9a and 9b show the element Z of Figure 8 in two working conditions.

With reference to the previous figures, the reference number 10 indicates the device for fixing Removable templates to corresponding lasts by means of a strip of adhesive tape.

A metal structure, indicated by the reference T, includes a base B, a column M fixed to the base B, two transverse arms 30a and 30b, located next to each other and fixed to the top head of column M, and a vertical support S fixed to the head of column M and intended to support a roll  11 of adhesive tape 1.

A cutting element 3 is placed between the two arms 30a and 30b, which includes a blade 32 and a counter-blade 33, which are operated by two 320 and 330 pneumatic jacks, respectively.

When in the rest position, the blade 32 and the counter knife 33 define a through hole 9 whose function It is explained later.

A drive roller V is fixed on the blade 32, in the region of the hole 9.

The drive roller V is intended for guide the adhesive tape 1, which unwinds from the roll 11 through of hole 9, and to define the "stop point" for the belt adhesive in the region of the V drive roller.

Column M supports, fixed thereto, a pad 50 and a working group 6, located below the pad 50.

Pad 50 and workgroup 6 define a workstation 5.

The pad 50, which has a transverse axis, it is supported by an axis 52, which slides freely through a sleeve 53, fitted with an anti-rotation boss 54 that fits freely with a groove 55 made in sleeve 53.

First and second half sensors 57a and 57b are fixed at the free end of shaft 52.

The pad 50 can retract axially against the action of an elastic means 56; the first means 57a sensors detect a predetermined pad recoil 50, while the second sensor means 57b detects a predetermined recoil of pad 50 greater than the First.

Working group 6 includes two guides vertical 61 (of which only one is shown online discontinuous), between which a vertical plate 62 slides.

The vertical plate 62 supports a transverse arm 63 cantilever bearing a body 60 that extends substantially vertically, shown in Figure 3.

The body level 60 is adjustable by means of a actuator 64, for example of mechanical type (Figures 1 and 2), manual or controlled by a motor means of known type.

The upper part of the body 60 supports a bar 65, perpendicular to transverse arm 63, and includes an actuator 66 (for example, pneumatic type) that operates a shaft vertical 67 that moves freely through bar 65.

A support 68, fixed to the vertical axis 67, is guided vertically and simultaneously locked in its rotation by means of a pair of vertical guide shafts 69, which pass freely through through holes 690 made in the bar 65

The support 68 has two through holes 680, a through which the wings 71 of a U-shaped frame pass 70.

The base 72 of the U-shaped frame 70 is located under support 68.

The upper ends of the wings 71 carry, free, a first lower roller R1, held in its extreme elevated position in the absence of any external force by first elastic means E1, wound around the part of the wings 71 included between the support 68 and the first lower roller
R1.

The extreme elevated position of the first roller lower R1 is defined by the contact of the base 72 of the frame with support 68.

The first lower roller R1 is facing a second upper roller R2, which is fixed to the arms previously indicated 30a and 30b, and that moves vertically against the action of a few second elastic means E2.

The device 10 also includes a pincer 4 (Figures 1 and 2) located in front of pad 50 and the group of work 6.

Pincer 4 includes two tweezers 4a and 4b to which two actuators 42a and 42b are fixed.

The actuators 42a and 42b cause the opening and pincer closure.

The other end of actuators 42a and 42b is fixed to a block 43 supported by a vertical axis 45 which it acts by means of an actuator 44, for example a pneumatic jack; he vertical axis 45 passes freely through a through hole 76a made in a cross bar 76 fixed to the body 60.

The vertical movement of block 43 causes Pincer 4 reaches two limit positions, one defined by the upper dead center (TDC), in which the pincer takes, in the recoil station 2, the end 90 of the next adhesive tape, more precisely, which is over the through hole 9, and the other defined by the bottom dead center (BDC), in which the part bottom of block 43 rests on crossbar 76 of body 60.

The resting position defines the length of the adhesive tape 1.

To describe the operation of the device 10, a condition must be considered, in which the working group 6 is positioned to define a corresponding level of body 60. During adjustment, a distance "d" (Figure 2) is defined between the first lower roller R1 and the second upper roller R2, of so that a space is defined that corresponds to the size of the Template to be fixed in the last.

Then, the actuator 44 moves vertically the pincer 4 until it reaches the top dead center (Figure 1a).

During the movement indicated above, the actuators 42a and 42b of the pliers 4 keep the clamps open 4a and 4b of the pliers 4.

Pincer 4 passes through hole 9 and picks up the end 9 of the adhesive tape 1 by closing the tweezers (Figure 1b).

After taking the end of the adhesive tape 1, the pincer 4 moves vertically down, pulling the adhesive tape, to the bottom dead center defined by the contact between the bottom of block 43 and the bar cross section 76 (Figure 2).

Under these conditions, the operator places the template 100 on last 200, holding and stabilizing the last with your hands, and align the bottom surface of the template with adhesive tape 1.

Then the set of last template is contacted with the part of the adhesive tape 1, in front of the pad 50, and with a slight pressure is achieved that the adhesive tape 1 adheres to the template, and thereby removing the pad fifty.

Therefore, pad 50 passes from a resting position, in which the elastic means 56 are located in non-working condition and the anti-rotation boss 54 is located near the stop position of slot 55, Figure 4, up to a maximum recoil position, in which the elastic means 56 they are in working condition and the anti-rotation boss 54 is in maximum recoil position with respect to slot 55, Figure 5.

In the maximum recoil position, the first sensor means 57a first detect the tail portion of shaft 52 of pad 50, which controls the opening of pincer 4, as well as the performance of the cutting means 32, 34, so that it cut the adhesive tape 1 and define the strip 15 of adhesive tape, as shown in Figure 4a.

Next, the second sensor means 57b they detect the tail part of the shaft, which controls the actuator 66 and then, the vertical axis 67 moves the support upwards 68.

The vertical movement of the support 68, as shown in Figure 5, compress the elastic means E1, attached to the U-shaped frame 70, thereby changing the extreme position of the first lower roller R1.

As a consequence of the movement above indicated, the first lower roller R1 and the second roller upper R2, cooperating functionally, bend inward and compress the ends of the adhesive strip 15 in the region of the F edges of last 200.

After folding the strip of adhesive tape 15 on the edges F of the last 200, the operator stops pressing the last-template-strip set adhesive against pad 50, therefore pad 50 returns to rest position due to media action elastic 56.

Then, the operator removes the set of last-template-adhesive strip device 10 and a photoelectric cell (not shown in the attached drawings), located near pad 50, does not detect the presence of the workforce and consequently the pincer 4, which passes from the bottom dead center back to the point dead top, so take the end 90 of the masking tape near the through hole 9.

The device for removable fixation of templates to corresponding lasts using a strip of tape Adhesive has many particular advantages.

The presence of a working group 6, pincer 4, a pad 50 and cutting means (blade and counter knife), allows to automate, although only partially, the stages of Template fixing to last.

In fact, Working Group 6, through the adjustment of the distance between the first lower roller R1 and the second upper roller R2 defines the size of the template, which must be attached to the corresponding last.

Therefore, a standard position is defined for a series of templates to be fixed, and the operator sees facilitated the job of placing the set of template-last, which he stabilizes and sustains While the device is working.

The presence of the pincer 4, which takes the tape adhesive 1 and pull it vertically down, so that it defines the length of the strip of adhesive tape needed to fix the template to the last, is advantageous because the using only a pincer simplifies the work of the device and allows to accelerate and synchronize operations following.

During manual positioning of the set of template-last between the upper rollers and lower, the operator pushes the pad.

The pad not only facilitates the fixation of the adhesive tape on the surface of the last but also controls, by means of suitable sensor means, the opening of the pincer, the operation of the cutting means (blade and counter knife) so that the adhesive tape 1 is cut, and the vertical movement of the support 68, which results in bending and fixing the ends of the adhesive tape over the edges F of last 200.

Consequently, the operator must maintain manually the coupling between the template and the last, while that the device 10 prepares the adhesive tape, cuts it so which defines strip 15 and bends it over the last.

Consequently, the proposed procedure It includes:

vertical positioning down the tape adhesive;

the centering of the template with respect to the last and maintenance of the set positioning last template by the operator, who maintains the ends of the set, that is, the tip and the heel;

the thrust of the assembly only with a movement of the operator's arms, transversely with respect to the adhesive tape, until the strip of adhesive tape can bend over the edges of the last.

According to a proposed embodiment (Figure 8), an elastic band 600 is fixed, located in front of the pad 50 and to the lower and upper rollers R1 and R2, in 600A to the machine structure and is controlled by media action 600B elastics.

The elastic band 600 is intended to improve the Adhesion of adhesive strip 15 to template 100 and to cooperate with the lower and upper rollers R1 and R2 in the bending of the ends 15A of the adhesive strip 15 on the edges F of the last, which optimizes the adhesion of the latter to the ends 15A of the adhesive strip 15.

Instead of the first sensor means 57a, there are detection means 500, for example a micro switch usually deactivated (position ZD in Figure 9a).

The last set 200-template 100 presses the micro switch, and then therefore activates it (position ZA in Figure 9b), when the set is about to touch the adhesive tape 1; this causes the opening of the pliers 4 and activation of the cutting means 32, 34, so that they define the strip 15 of adhesive tape.

Claims (22)

1. Procedure for the removable fixing of templates to corresponding lasts by means of strips of adhesive tape, characterized by: - the vertical placement of said adhesive tape (1) by moving down; - centering a template (100) on adhesion on the surface of a corresponding last (200) and maintaining the positioning of the set of last template by an operator, who holds only the ends of said set, that is, the tip and heel; - make the whole, only by a operator's arm movement, come into contact transversely with a strip (15) obtained from said tape adhesive; - establish the adhesion of said adhesive strip (15) to said template (100) and bending the ends (15A) of said strip (15) on the edges (F) of the last (200). Method according to claim 1, characterized in that said strip (15) adheres to said template (100) due to the elastic contrasting action of a pad (50). Method according to claim 1, characterized in that said strip (15) adheres to said template (100) due to the combined elastic contrasting action of a pad (50) and an elastic band (600) located opposite the pad . Method according to claim 1, characterized in that the ends (15A) of the strip (15) bend over the edges (F) of the last due to the action of two rollers (R1, R2) adapted to elastically push said ends (15A) against said edges (F). 5. Method according to claim 1, characterized in that the ends (15A) of the strip (15) are folded and consequently adhere to the edges (F) of the last due to the combined action of two rollers (R1, R2), intended to elastically push said ends over said edges, and with an elastic band (600) facing said rollers (R1, R2). 6. Device for the removable fixing of templates to corresponding lasts by means of strips of adhesive tape, characterized in that it includes: means (O) for feeding tape to a recoil station (2) with the adhesive surface facing outside; means (3) for cutting said adhesive tape in said recoil station (2); pincer means (4) that move vertically from said recoil station, in which said pincer means catch the end of said tape (1), up to a position below an adjustable level; a workstation (5), located next to the path followed by said pincer means (4) on the side of the non-adhesive surface of said tape, and which includes a cross pad (50) that moves axially against the elastic means (56) attached thereto; first sensor means (57a) to detect a predetermined recoil of said pad (50) and for controlling said cutting means (3) and said pincer means (4); a few second sensor means (57b) to detect a predetermined recoil of said pad (50), greater than the above, and to control a cooperating pushing means functionally with said pad (50); pressure means connected to said second sensor means (57b) and operatively cooperating with said pad; and why, when said tongs means (4) they are in the lower position, an operator in front of said workstation (5) can place and move a fixed set of last-template with your hands, on the side of the face adhesive of said adhesive tape (1), towards said pad (50), thus touching the adhesive side of the part first central of the adhesive tape included between said station of recoil (2) and said pincer means (4), and then touching the pad (50), so that pad (50) moves in recoil with a movement detected by said first means sensors (57a), which activate said cutting means (3) to define a strip (15) of adhesive tape, and said pincer means (4); said movement being also detected by said second sensor means (57b), which activate said means of pressure, which press and bend inward the external parts (15A) of said strip (15) external to said pad (50) against the edges (F) of the last template template. 7. Device for the removable fixing of templates to corresponding lasts by means of strips of adhesive tape, characterized in that it includes: means (O) for feeding tape to a recoil station (2), with the adhesive surface facing outside; means (3) for cutting said adhesive tape in said recoil station (2); pincer means (4) that move vertically from said recoil station, in which said pincer means catch the end of said tape (1), up to a position below an adjustable level; a workstation (5), located next to the path followed by said pincer means (4) on the side of the non-adhesive surface of said tape, and which includes a cross pad (50), which moves axially against the elastic means (56) attached thereto; detection means (500) to detect the situation of a last-template set, stabilized and held by the hands of an operator, near the portion of the tape in front of the pad (50), being said detection means intended to activate said means of cut (3) and said pliers means, also including said workstation (5) sensor means (57b) that detect a predetermined recoil of said pad (50) and controlling pushing means that functionally cooperate with said pad (fifty); and because, when said pliers means (4) are in the lower position, an operator located in front of said station work (5) can place and move a set set of last-template with your hands, on the side of the adhesive face of said adhesive tape (1), towards said pad (50), thereby activating said detection means (500) and consequently activating said cutting means (3) to define a strip (15) of adhesive tape and said pliers means (4), coming into contact then said set of last-template first with adhesive face of the central part of the adhesive tape portion included between said recoil station (2) and said pincer means (4) and then coming into contact with the pad (50), so that the pad (50) travels in reverse with one movement detected by said sensor means (57b), which activate said pressure means to press and bend the parts inwards external (16A) of said strip (15) external to said pad (50), against the edges (F) of the set of last template. Device according to claim 7, characterized in that it includes an elastic band (600) located in front of said pad (50) and in front of said pushing means and intended to optimize the adhesion of said strip (15) to said template (100) of said template-template assembly and to cooperate with said pushing means to bend the ends (15A) of said strip over the edges (F) of the last (200) of said template-template assembly. 9. Device according to claims 6 or 7 or 8, characterized in that said pushing means include: a first lower roller (R1) supported by a body (60) and which moves with respect thereto against the action of elastic means (E1) attached thereto; a second upper roller (R2) facing the first lower roller and supported by the support structure of the device, said second upper roller moving (R2) vertically against the action of elastic means (E2) attached the same; said body (60) being designed to adjust the height of the resting position, by the action of an actuator that it is an integral part of it and controlled by said second means sensors (57b). 10. Device according to claims 6 or 7 or 8, characterized in that said pushing means include: a first lower roller (R1) supported by a body (60) and which moves with respect thereto against the action of elastic means (E1) attached thereto; a second upper roller (R2) facing the first lower roller (R1), supported by the structure of device holder, which moves vertically against the action of elastic means (E2) attached thereto; said body (60) being designed to adjust the height of the resting position of said first lower roller (R1) and to move the latter up by the action of a actuator that is an integral part of said body (60) which is controlled by said second sensor means (57b); a crossbar (76) fixed to said body, moving said pliers means (4) until resting on said crossbar (76) so that the lower position of the same. Device according to claim 10, characterized in that said pincer means (4) are supported by a block (43), of which the actuators (42a, 42b) of said pincer means (4) are integral part, being axially displaced said block (43) by the shaft (45) of an actuator (44) positioned so that said block (43) comes into contact with said crossbar (76). Device according to claim 6, characterized in that said pincer means (4) include two clamps (4a, 4b) that approach each other or move away from each other by means of actuators (42a, 42b) controlled by said first sensor means (57a ). Device according to claims 9 or 10, characterized in that it includes actuator means (66) that adjust the vertical position of said body (60), thereby changing the resting position of said second upper roller (R2). 14. Device according to claim 10, characterized in that it includes actuator means (66) that adjust the vertical position of said body (60), synchronously changing the resting position of said second upper roller (R2) and the height of the crossbar ( 76). 15. Device according to claim 6, characterized in that said cutting means (3) include a blade (32) and a counter knife (33) actuated by corresponding actuators (320, 330) controlled by said first sensor means (57a), said said defining blade and counter knife, in rest position, a through hole (9), through which said adhesive tape (1) and said pliers means (4), the latter during its passage from and to said recoil station (2 ). 16. Device according to claims 6 or 7, characterized in that said pad (50) includes a shaft (52) that slides freely into a sleeve (53) provided with an anti-rotation projection (54) that fits freely with a groove (55) made in the sleeve (53), the end of said shaft (52) having attached thereto, elastic means (56), as well as said first and second sensor means (57a, 57b). 17. Device according to claims 9 or 10 or 13 or 14, characterized in that said body (60) is supported in cantilever by a transverse arm (63) fixed to a vertical plate (62) supported and guided vertically by means (61) made in a column (M) of the support structure of the device, and because the level of said body (60) can be adjusted by means of an actuator (64). 18. Device according to claim 17, characterized in that the upper part of said body (60) includes a bar (65) perpendicular to said transverse arm (63) and also includes an actuator (66) operating on a vertical axis (64 ) that travels freely through said bar (65), with said vertical axis (67) having a support (68) fixed thereto, said support (68) having two through holes (680) through which the wings (71) of a U-shaped frame (70), the base (72) of said U-shaped frame (70) being located under the support (68) and supporting the upper ends of said U-shaped frame (70) the first free lower roller (R1). 19. Device according to claims 6 or 7, characterized in that said means (O) feeding tape to a recoil station include a vertical support (S) fixed to the head of the support structure of the device, supporting said support (S ) a roll (11) of adhesive tape (1) and because it includes a transmission roller (V) located on the means (3) that cut said adhesive tape (1) near and above the recoil station (2). 20. Device according to claim 7, characterized in that said pliers means (4) include two clamps (4a, 4b) that approach each other or move away from one another by means of actuators (42a, 42b) controlled by said detection means (500 ). 21. Device according to claim 7, characterized in that said cutting means (3) include a knife (32) and a counter knife (33) operating by means of the corresponding actuators (320, 330) controlled by said detection means (500), defining said blade and counter knife, when they are in the rest position, a through hole (9) through which said adhesive tape (1) and said pliers means (4), the latter during its passage from and to the station recoil (2). 22. Device according to claims 7 or 20 or 21, characterized in that said detection means includes a micro-switch operated by the last-template assembly.