EP0766214A1 - Method and device for the protection of articles against theft, and their applications to the automatic lending of books - Google Patents

Abstract

The protection system has a thin conformal circuit attached to the book to be protected. There is a three section machine (100,200,300) with a front display screen (202) to disable the alarm. The book is placed on the machine operating surface (310), and positioned by a side tab (311). The upper section (201) reads the magnetic strip on the book, and a screening foil is pushed through a lower hole (312) onto the book side. A validation button operates the alarm cancellation process.

Description

The invention relates to a method and a device for protecting articles against theft by detecting the attenuation of a resonant circuit secured to said articles when they pass through a control zone and their applications to automated lending. of books.

It is known to use, in the fight against the theft of certain articles, and very particularly articles of clothing, modules fitted with a resonant electronic circuit, which are fixed to said articles by means of a device. requiring, for its assembly or disassembly, the use of special tools, which is only available to staff responsible for collection formalities. Such a device is described in document US Pat. 3,740,742, relating to an apparatus making it possible to detect the passage of an electronic circuit resonating in a control zone equipped with means for producing an electromagnetic pulse, causing the resonance of the circuits. electronics incorporated in the anti-theft modules connected to the articles. A receiver is used to detect the resulting radiation emitted by the resonant circuits and said receiver is conditioned to detect signals only after the excitation pulse has ceased. Such a protection process requires human intervention for the removal of the anti-theft module on each item, between the time when the purchase has been paid and when the buyer enters the control area, which excludes any automation of the sale. or the loan of items despite the management and control facilities offered by bar codes and by electronic identification and payment cards, however already widely distributed and used.

In the field of lending certain articles, and particularly books, it is known, in addition to providing them with a bar code allowing their identification and management and to ask borrowers to use an electronic card subscription, to stick, permanently, on the cover of the book, a ferro-magnetic label, on which digitized data can be saved, which must be erased using a demagnetizer at the end of the loan formalities . This management system is cumbersome and has the drawback of using magnetic radiation, which can cause degradation of recording on audio and video media.

Two techniques are currently used in the detection field. One uses electromagnetic radiation, the other uses radio frequency.

Electromagnetic technology is the oldest and is currently at the end of its evolution. In fact, the main drawback of this technology is, on the one hand, that it cannot operate reliably in an environment sensitive to magnetic fluxes - To name only the main ones: IT equipment, metallic structures, etc. .., that is to say the principal of our professional environment - and, on the other hand, limits the spacing between antennas to approximately 90 cm, which represents a major drawback for safety establishments open to the public.

In addition, the size of the electromagnetic technology detectors does not allow easy installation in sites with confined configuration.

• d'installer les détecteurs près de la banque de prêt, ce qui est impossible avec le système électromagnétique,
• l'utilisation d'un matériel informatique à proximité des détecteurs, implantation impossible avec l'électromagnétique,
• l'écartement des bornes de détection jusqu'à 130 cm, ce qui est techniquement impossible avec l'électromagnétique pour la protection des livres et des enregistrements audio et vidéo,
• son installation auprès de masses métalliques, ce qui est radicalement exclu avec l'autre technologie,
• la protection des supports magnétiques, tels que disquettes informatiques, ce qui est impossible avec le système électromagnétique.

Radio frequency technology, which is in its early application in the field of detection, removes all the constraints of electromagnetism related to the environment and increases the reliability of control. Indeed, radio frequency detection allows:

• install the detectors near the loan bank, which is impossible with the electromagnetic system,
• the use of computer equipment near the detectors, installation impossible with electromagnetics,
• the spacing of the detection terminals up to 130 cm, which is technically impossible with electromagnetics for the protection of books and audio and video recordings,
• its installation with metallic masses, which is radically excluded with other technology,
• the protection of magnetic media, such as computer diskettes, which is impossible with the electromagnetic system.

A method and a device for protecting articles against theft are already known, corresponding to the preamble of claim 1 (US-A-4,745,401). The resonant electronic circuit, discreetly and permanently connected to the article which uses it is made at will detectable or undetectable by the detection means by means of fixed screens made of a material which can be magnetized or demagnetized at the time checkout, which requires mandatory passage through this checkpoint and special intervention by staff responsible for collection and control. Such a means, despite its effectiveness, hardly lends itself to the total automation of purchasing, rental or borrowing formalities.

The object of the present invention is to remedy these drawbacks. This invention, as characterized in the claims, solves the problem of having, permanently, with the article, an electronic means for detecting the passage of the latter in an area controlled by radio frequency and to be able, at will, to make these electronic means of detection inoperative without resorting to the separation of these from the article concerned, and to fully automate the formalities of sale or loan, including the final or provisional concealment of the means of detection secured to the article.

• le circuit résonnant de très faible épaisseur est incorporé de façon quasi-affleurante à son support,
• le circuit résonnant est rendu indétectable par superposition temporaire d'un écran amovible imperméable aux émissions des moyens de contrôle.

The method of protecting articles against theft by detecting electromagnetic signals emitted by a resonant electronic circuit secured to said articles during the passage thereof in a control area; said resonant electronic circuit permanently connected to the article being made undetectable as soon as the formalities of purchase or borrowing and being made again detectable as soon as certain other formalities have been regularly completed, such as those related to the return of a borrowed item for example, characterized in that:

• the very thin resonant circuit is incorporated almost flush with its support,
• the resonant circuit is made undetectable by temporary superposition of a removable screen impermeable to the emissions of the control means.

The temporary superimposition of the screen on the support is obtained by adhesion of the latter to the surface of said support.

The screens are presented in a band, with individual transfer to the resonant circuit supports at the end of the purchase or borrowing formalities.

The device for implementing the method according to the invention is mainly characterized in that the screen impermeable to the emissions of the control means consists of an aluminized self-adhesive label, in that the said self-adhesive labels are presented in a strip on a film, one side of which is pre-glued, against which the labels are fixed by their back, and the other side of which has been made non-stick, in that the transfer of the labels to the resonant circuit supports is obtained by means of a right angle return, which ensures the gradual detachment of each label, and by means of a presser, on which each label is deposited at the time of its detachment from the support film, and in that the detection of the resonant circuits in the control zone is carried out by radio frequency.

• une tablette munie d'une règle de positionnement du livre et comportant une ouverture, avec trappe d'obturation, pour le passage du presseur inférieur,
• un ensemble de défilement et d'arrêt du film porte-étiquettes,
• un renvoi à angle droit du film porte-étiquettes assurant le décollement des étiquettes,
• un presseur inférieur assurant la mise en contact d'une étiquette avec la couverture du livre,
• un presseur supérieur rappelant le livre contre la tablette lors du collage d'une étiquette,
• un dispositif d'actionnement mécanique de la trappe de fermeture de l'ouverture ménagée dans la tablette pour le passage du presseur inférieur,
• divers moyens de contrôle et de protection.

A book lending machine applying the method and implementing the device according to the invention is characterized in that it essentially comprises the following elements:

• a shelf provided with a book positioning rule and comprising an opening, with shutter hatch, for the passage of the lower presser,
• a set of scrolling and stopping of the label-carrying film,
• a return at right angles to the label-carrying film ensuring the detachment of the labels,
• a lower presser ensuring that a label comes into contact with the cover of the book,
• an upper presser bringing the book back against the shelf when affixing a label,
• a mechanical actuation device for the closing flap the opening in the shelf for the passage of the lower presser,
• various means of control and protection.

According to a particular embodiment, the lower presser consists of an arm, permanently recalled upwards by a spring, the free end of which is fitted, on the top, with a non-stick pressing plate, on one of the sides of the return at a right angle ensuring the detachment of the labels, and, below, a tension roller, and the base of which is fixed perpendicular to a slide mounted on a vertical slide, whose movement is controlled by a roller plunger and by a cam driven by a geared motor.

The upper presser consists of a mass, recalled downwards by gravity, whose lifting is ensured by a slide moving along an upright under the action of a sliding sheath on a slide secured to said slide and coming, at the end of the upper stroke, bear against a stopper integral with the slide to ensure the raising of the latter, said sliding sleeve being connected by a connecting rod and a crankpin to the actuation cam of the lower presser.

The cam, ensuring the actuation of the lower and upper pressers, has a semicircular contour, with a flat surface located on the side of the crankpin driving the operating rod of the sliding sleeve for actuating the upper presser.

The diameter of the cam and the distance (D) of the flat with respect to its axis are determined respectively to obtain sufficient lifting of the upper presser and a controlled stroke of the lower presser.

The mechanical device for actuating the closing flap of the opening for the passage of the lower presser consists of a cable, mounted on idler pulleys, one end of which is recalled by a weight and the other of which end is secured to the sliding sleeve ensuring the lifting of the upper presser; said hatch being connected to the horizontal strand of this cable by an operating tongue.

The upper presser comprises a protective flap and a baluster, mounted to slide relative to the mass and combined with a detector connected to an emergency stop device fixed on top of the protective flap. The sliding downward of the protective flap of the upper presser and of the baluster with respect thereto is limited respectively by the top of said flap and by a stop ring allowing each a freedom of movement of approximately 15 mm .

The advantages obtained thanks to this invention essentially consist in the fact that the automated operations for concealing the anti-theft resonant circuits can be inserted into a set of operations triggered by the clients and controlled by an electronic management system, from a automaton sale or loan, without any risk of alteration of recording on magnetic media.

• la figure 1 représente une vue extérieure schématique en perspective de l'automate,
• la figure 2 représente une vue schématique en perspective de l'ensemble du mécanisme de pose des étiquettes,
• la figure 3 représente une vue schématique partielle, en perspective, des dispositifs de présentation et de pose des étiquettes,
• la figure 4 représente une vue schématique en perspective des dispositifs d'actionnement des moyens d'application des étiquettes.

Other characteristics and advantages will appear in the following description of a book lending machine, produced according to the method and the device of the invention, given by way of non-limiting example with regard to the appended drawings in which:

• FIG. 1 represents a schematic exterior view in perspective of the automaton,
• FIG. 2 represents a schematic perspective view of the entire mechanism for applying the labels,
• FIG. 3 represents a partial diagrammatic view, in perspective, of the presentation and labeling devices,
• FIG. 4 represents a schematic perspective view of the actuating devices of the means for applying the labels.

The figures represent a book lending machine according to the invention, comprising a main box 100 supporting an upper box 200 , on the front of which is a lower box 300 .

• un motoréducteur 101, entraînant une came 110 à méplat 111, à laquelle est reliée une bielle 112, elle-même reliée à un foureau 113 coulissant sur une glissière 121 à butoir 122 solidaire d'un coulisseau 120 à équerre d'entraînement 123, se déplaçant le long d'un montant 130, sur le devant duquel se déplace un presseur supérieur 140, constitué d'une masse 141 reliée à son coulisseau d'entraînement 120 par une équerre 123 ; la dite masse 141 étant munie d'un volet de protection 142 et d'une colonnette 143, combinés à un détecteur 144 fixé sur le dessus du volet de protection 142,
• un coulisseau 151 supportant le bras 152 de manoeuvre d'une plaquette de pressage 153, rappelé vers le haut par un ressort 154 monté sur une tige de guidage 155, le déplacement du dit coulisseau 151 sur une glissière 156 étant contrôlé par un poussoir 157 à galet 158 prenant appui sur la came 110,
• un dispositif d'actionnement 160 d'une trappe 313 obturant une ouverture 312 réalisée dans une tablette 310 comportant un câble 161 monté sur des poulies de renvoi 162, 163 et 164, dont l'une des extrémités 165 est reliée au fourreau 113 et dont l'autre 166 est reliée à un poids de rappel 167 assurant, par son brin horizontal 168, l'actionnement d'une languette de manoeuvre 169 d'une trappe 313 de fermeture d'une ouverture 312 ménagée dans la tablette de travail 310 équipant le caisson inférieur 300.

Said main box 100 houses the means for motorizing the fitting of the labels 320 , mainly comprising:

• a geared motor 101 , driving a flat cam 110 111 , to which a connecting rod 112 is connected, itself connected to a sleeve 113 sliding on a slide 121 with stop 122 secured to a slide 120 with a drive angle 123 , moving along an upright 130 , on the front of which moves an upper presser 140 , consisting of a mass 141 connected to its driving slide 120 by a bracket 123 ; said mass 141 being provided with a protective flap 142 and a small column 143 , combined with a detector 144 fixed on top of the protective flap 142 ,
• a slide 151 supporting the maneuvering arm 152 of a pressing plate 153 , biased upwards by a spring 154 mounted on a guide rod 155 , the movement of said slide 151 on a slide 156 being controlled by a pusher 157 at roller 158 bearing on cam 110 ,
• an actuating device 160 of a hatch 313 closing an opening 312 produced in a shelf 310 comprising a cable 161 mounted on return pulleys 162 , 163 and 164 , one of the ends 165 of which is connected to the sheath 113 and of which the other 166 is connected to a return weight 167 ensuring, by its horizontal strand 168 , the actuation of an operating tongue 169 of a hatch 313 for closing an opening 312 formed in the work table 310 fitted to the lower box 300 .

• un moyeu porte-bobine 330 de film 321 porte-étiquettes 320 avec dispositif de freinage en rotation (non représenté),
• un motoréducteur frein 322 entraînant le film 321 porte-étiquettes par l'intermédiaire d'un tambour 323 monté sur l'axe moteur (non représenté),
• des glissières (ou skis) de renvoi 324, 325,
• deux poulies folles 326, 327 encadrant le presseur inférieur 150,
• un rouleau fou de renvoi inférieur 159 du film 321 solidaire du bras 152 de la plaquette de pressage 153,
• un renvoi de bande à angle droit 328 assurant le décollement et le transfert des étiquettes 320 sur la plaquette de pressage 153,
• une cellule photo-électrique 329 commandant l'arrêt du déroulement du film 321 porte-étiquettes 320 en cas d'absence d'étiquettes 320 sur le dit film 321,
• une cellule photo-électrique commandant l'arrêt en fin de bande (non représentée),
• un presseur 150 constitué du bras presseur 152 et de la plaquette de pressage 153,
• une tablette 310, équipée d'une règle 311 de positionnement d'un livre 40 et d'une ouverture 312, de passage des étiquettes 320, normalement masquée par une trappe 313 à ouverture commandée par un dispositif 160 à câble 161 situé dans le caisson principal 100.

Said lower box 300 houses the means for fitting labels 320 mainly comprising:

• a spool holder 330 of film 321 label holder 320 with a braking device in rotation (not shown),
• a brake gearmotor 322 driving the film 321 label holder by means of a drum 323 mounted on the motor axis (not shown),
• return slides (or skis) 324 , 325 ,
• two idler pulleys 326 , 327 framing the lower presser 150 ,
• an idler lower return roller 159 of the film 321 secured to the arm 152 of the pressing pad 153 ,
• a right angle band return 328 ensuring the detachment and transfer of the labels 320 on the pressing plate 153 ,
• a photoelectric cell 329 controlling the stopping of the unwinding of the film 321 label holder 320 in the absence of labels 320 on said film 321 ,
• a photoelectric cell controlling the stop at the end of the strip (not shown),
• a presser 150 consisting of the presser arm 152 and the presser plate 153 ,
• a shelf 310 , equipped with a rule 311 for positioning a book 40 and an opening 312 , for the passage of labels 320 , normally masked by a hatch 313 with opening controlled by a device 160 with cable 161 located in the box principal 100 .

Said upper box 200 houses the electronic interface system controlling the loan machine to the library management computer by means of appropriate software.

• un lecteur 201 de carte magnétique d'utilisateur,
• un écran de contrôle 202,
• un bouton de validation du cycle 203,

On the front of this box 200 , are located:

• a user magnetic card reader 201 ,
• a control screen 202 ,
• a button for validating the cycle 203 ,

A cycle continuation button 170 is located on the front face of the main box 100 .

• démarrage du motoréducteur 101 d'actionnement de la came 110, qui, compte-tenu de sa forme et de sa position initiale (méplat 111 en haut), provoque la descente progressive du presseur supérieur 140, pour obtenir, tout d'abord, la mise en contact de son volet protecteur 142 et de sa colonnette 143 avec la couverture du livre 40, puis la mise en appui de la masse 141 contre celle-ci. Compte-tenu du décalage de 15 mm qui a été introduit entre le bord inférieur du dit volet 142 et l'extrémité inférieure de la colonnette 143 par rapport à la base de la masse 141, si un obstacle quelconque, autre qu'une surface plane horizontale, entre en contact avec le volet 142 ou la colonnette 143, un décalage vertical entre les deux est signalé par le détecteur 144 fixé sur le dessus du volet protecteur 142 : le cycle est alors interrompu pour dégagement de l'obstacle.

This upper box 200 is extended, downwards, by a mask 204 , concealing the upper presser 140 consisting of the mass 141 provided with its protective flap 142 , its safety column 143 and a stop detector 144 'emergency; the relative downward movement of said column with respect to the mass 141 being limited by a stop ring 145 .
By examining in more detail and successively Figures 1 to 3, we note that the borrower, after having introduced his magnetic identification card in the reader 201 , must, first of all, correctly position the book 40 against the rule 311 fixed on the top of the shelf 310 , then activate the cycle validation contact 203 by following the indications appearing on the control screen 202 . After identifying book 40 by reading the bar code on the back of it, an indication is given to the borrower as to the continuation of the cycle. If the authorization is granted, the borrower triggers the continuation of the cycle, by activating the corresponding contact 170 . The following operations then take place automatically:

• starting of the gearmotor 101 for actuating the cam 110 , which, given its shape and its initial position (flat 111 at the top), causes the upper presser 140 to descend gradually, in order to obtain, first of all, the bringing its protective shutter 142 and its baluster 143 into contact with the cover of the book 40 , then pressing the weight 141 against it. Taking into account the 15 mm offset which has been introduced between the lower edge of said flap 142 and the end lower of the column 143 with respect to the base of the mass 141 , if any obstacle, other than a horizontal plane surface, comes into contact with the flap 142 or the column 143 , a vertical offset between the two is indicated by the detector 144 fixed on top of the protective shutter 142 : the cycle is then interrupted to clear the obstacle.

In the most common cases, the presser 140 comes into contact with the cover of the book and rests with all its mass thereon. This vertical immobilization of said presser 140 causes the consecutive immobilization of the support slide 120 and the appearance of a play of increasing importance between the sliding sleeve 113 and the stop 122 of said support slide 120 .

The continued rotation of the cam 110 thus successively causes the opening of the hatch 313 for controlling the opening 312 produced in the edge of the shelf 310 , then the gradual ascent, via the flat 111 , of the cam 110 and the roller 158 of the pusher 157 for controlling the lower presser 150 , the arm of which moves upward under the action of the spring 154 , this, until the label 320 comes into contact with the lower cover of the book 40 . A play then appears between the roller 158 of the pusher 157 and the flat 111 of the cam 110 , which, while continuing its rotation, cancels this play again and causes, at the same time, the ascent, via the connecting rod 112 , the upper presser 140 and the erasure of the lower presser 150 by means of the pusher 157 ; the hatch 313 being closed during this operation. The gear motor 101 for pressing the pressers 140 , 150 is then stopped, the removal of the book 40 , after affixing of the label 320 for neutralization of the resonant circuit permanently incorporated in the lower cover of the book 40 , can then be carried out. the borrower can therefore safely cross the control zone located at the exit of the library.

Referring to FIG. 4, it can be seen that, as soon as the book 40 is removed, the geared motor 322 for driving the film strip 321 label holder 320 is started and the film unwinds by sliding in a reference to right angle 328 , which causes the gradual detachment, then the transfer of a label 320 on the pressing plate 153 of the lower presser 150 . As soon as the film 321 has taken place over a distance corresponding to the length of a label 320 , the geared motor 322 is stopped. From this moment, the loan machine is again available for a new affixing of a label, after the previous administrative operations, indicated above.

As we have just seen in connection with this particular example of nonlimiting application to book lending, the borrowing of an article can be carried out in a completely automated manner, since it suffices for the borrower to withdraw itself the article in the radius where it is made available to the public, then to trigger itself, from the lending machine, which can take, of course, any configuration better suited to the nature and in the form of the articles concerned, all of the administrative operations and accounting prior to borrowing, which may include the automatic debit of borrowing costs, as well as the neutralization, via the label which is automatically affixed, of the resonant circuit which permanently accompanies the articles and which, from this fact, remains insensitive to radio frequency stresses to which it is subjected when passing said article in the control zone. This lending machine, permanently connected, by appropriate software, to the computer network of the lending organization, constitutes, so to speak, a peripheral of the central management computer which is directly implemented by the customers.

Given the absence of magnetism of the means used, both to protect the items individually (passive electronic circuit), and to detect the presence of these in the event of theft (radio frequency), their use for protection against theft of items sensitive to magnetic radiation is possible; this is particularly the case for recordings on magnetic media.

The use of the invention for the loan of bulky and heavy items can also be envisaged, since it suffices, in this case, to use an intermediate support of flat shape, permanently connected by a cable to the article, into which the resonant circuit would be inserted.

Claims (12)

Method for protecting articles against theft by detecting electromagnetic signals emitted by a resonant electronic circuit secured to said articles when they pass through a control zone; said resonant electronic circuit discreetly and permanently connected to the article, being made undetectable as soon as the formalities of purchase or borrowing have been regularly completed and being made again detectable as soon as certain other formalities have been regularly completed, such as those linked to the return of a borrowed article for example, characterized in that: - the very thin resonant electronic circuit is incorporated almost flush with its support, - the resonant electronic circuit is made undetectable by temporary superimposition of a removable screen impermeable to the emissions of the control means. Method according to claim 1, characterized in that the temporary superposition of the screen on the support is obtained by adhesion of the latter to the surface of said support. Method according to claim 1 or 2, characterized in that the adherent screens are presented in a band, with individual transfer to the supports of resonant circuits at the end of the purchasing or borrowing formalities. Device for implementing the method for protecting articles against theft by detecting electromagnetic signals emitted by a resonant electronic circuit secured to said articles when they pass through a control zone according to claims 1 to 3 taken from as a whole, characterized in that the removable emission-impermeable screen of the control device consists of a self-adhesive aluminized label ( 320 ), in that the said self-adhesive labels ( 320 ) are presented in a strip on a film ( 321 ) , one of the faces of which is pre-glued and against which the labels are fixed by their backs, and the other side of which has been made non-stick, in that the transfer of the labels ( 320 ) to the resonant circuit supports is obtained by means of a right angle return ( 328 ), which ensures the gradual release of each label ( 320 ), and by means of a presser, su r which each label is deposited at the time of its detachment from the support film, and in that the detection of the resonant circuits in the control zone is carried out by radio frequency. Book lending machine applying the method and implementing the device for protecting articles against theft by detecting electromagnetic signals emitted by a resonant electronic circuit secured to said articles when they pass through a control zone, according to claims 1 to 4, characterized in that it essentially comprises the following elements: a shelf ( 310 ) fitted with a positioning rule ( 311 ) for the book ( 40 ) and comprising an opening ( 312 ), with shutter hatch ( 313 ), for the passage of the lower presser ( 150 ), a set of scrolling and stopping of the film ( 321 ) label holders ( 320 ), - a right angle return ( 328 ) of the film ( 321 ) label holder ( 320 ) ensuring the detachment of the labels ( 320 ), a lower presser ( 150 ) ensuring that a label ( 320 ) is brought into contact with the cover of a book ( 40 ), - an upper presser ( 140 ) recalling a book ( 40 ) against the shelf ( 310 ) when sticking a label ( 320 ), a device ( 160 ) for mechanical actuation of the hatch ( 313 ) for closing the opening ( 312 ) formed in the shelf ( 310 ) for the passage of the lower presser ( 150 ), - various means of control and protection. Book lending machine according to claim 5, characterized in that the lower presser ( 150 ) consists of an arm ( 152 ), permanently returned upwards by a spring ( 154 ), the free end of which is fitted , on top, of a non-stick pressing plate ( 153 ), on one side of the right angle gear ( 328 ) ensuring the labels peel off ( 320 ), and, below, a tension roller ( 158 ), and the base of which is fixed perpendicularly to a slide ( 151 ) mounted on a vertical slide ( 156 ), the movement of which is controlled by a pusher ( 157 ) with roller ( 158 ) and by a cam ( 110 ) driven by a controlled geared motor ( 101 ). Book lending machine according to claim 5, characterized in that the upper presser ( 140 ) consists of a mass ( 141 ), biased downwards by gravity, the lifting of which is ensured by a sliding slide ( 120 ) along an upright ( 130 ) under the action of a sheath ( 113 ) sliding on a slide ( 121 ) integral with said slide ( 120 ) and coming, at the end of the upper stroke, to bear against a stopper ( 122 ) integral with the slide ( 120 ) to ensure the lifting of the latter; said sliding sleeve ( 113 ) being connected by a connecting rod ( 112 ) and a crankpin to the cam ( 110 ) for actuating the lower presser ( 150 ). Book lending machine according to claim 6 or 7, characterized in that the cam ( 110 ), ensuring the actuation of the lower ( 150 ) and upper ( 140 ) pressers, has a semicircular contour, with flat ( 111 ) located on the side of the crankpin driving the connecting rod ( 112 ) for operating the sliding sleeve ( 113 ) for actuating the upper presser ( 140 ). Loan machine according to claim 8, characterized in that the diameter of the cam ( 110 ) and the distance ( D ) of the flat ( 111 ) relative to the axis thereof are determined respectively to obtain sufficient lifting of the upper presser ( 140 ) and a controlled stroke of the lower presser ( 150 ). Loan machine according to claim 5, characterized in that the mechanical device for actuating the flap ( 313 ) for closing the opening ( 312 ) for the passage of the lower presser ( 150 ) consists of a cable ( 161 ) , mounted on return pulleys ( 162, 163, 164 ), one end of which ( 166 ) is returned by a weight ( 167 ) and the other end of which ( 165 ) is secured to the sliding sleeve ( 113 ) ensuring raising the upper presser ( 140 ); said hatch ( 313 ) being connected to the horizontal strand ( 168 ) of this cable ( 161 ) by an operating tongue ( 169 ). Loan machine according to claim 5, characterized in that the upper presser ( 140 ) comprises a protective flap ( 142 ) and a baluster ( 143 ), mounted sliding with respect to the mass ( 141 ) and combined with a detector ( 144 ) connected to an emergency stop device attached to the top of the protective flap ( 142 ). Loan machine according to claim 11, characterized in that the sliding downward of the protective shutter ( 142 ) of the upper presser ( 140 ) and of the baluster ( 143 ) relative to the latter is limited respectively by the top of the said flap ( 142 ) and by a stop ring ( 145 ) allowing each a freedom of movement of about 15 mm.

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