CS207385B2 - Device for closing the upper part of the inner cover on the machine for packing the cigarettes in the boxes with the suspending lid - Google Patents

Abstract

The packaging machine has a plurality of stations for folding the wrapping material, each station comprising a compartmented wheel (15), fixed folding guides and movable folding strips (40, 41, 47, 48) and a drive mechanism (1-14). The device enables the compartmented wheel which is normally used in machines for packaging soft packs, to be used in a machine of this type since it inverts the arrangement for folding the top flaps of the inner wrapper. For this purpose, the movable strips (40, 41, 47 and 48) are arranged in pairs (40, 47 and 41, 48) on opposite sides of the wheel (15) and are mounted in pairs (40, 41 and 47, 48) on a shaft (42 and 49) which oscillates by means of a lever mechanism and a cam (10, 11). The lever mechanism between the shaft (42) of the movable folding strips (40 and 41) and the cam (10) comprises a component (44) which oscillates on a fixed point (45), so that the strips (40, 41) are first made to turn in a direction opposite to that of the movement of the wheel (15), then stop and wait, and then turn in a direction opposite to the first, then again in the first direction and finally in the opposite direction. <IMAGE>

Description

The invention relates to a device for closing the upper part of an inner packaging on a machine for wrapping cigarettes in a box with a lid for a will.

Packaging ^p RVK ^y tvořík As a whole package ^kt ER ^Y has the character ^crab cyclic ^{with the} lid ^on a ^Aveta, sestávvaí, as known, from the inner soft shell consisting essentially prismatic metal foil pouches, and the outer wrapper constituted box of thin carton.

The inner wrapper may be disposed on the periphery of the plurality of cigarettes in a number of ways from the wrapper and may have different designs; In particular, the invention relates to such types of soft inner containers having the character and form of soap containers.

At ^about t to these type of packaging, both obtained from oMélni ^. metal blank ^to him ^{é é} ovov film vytvorzí first tube and the mold is folded with four folds is guided in the direction of its major dimension to wrap around the four longitudinal sides of the cigarette and the wrapper is formed with two opposite walls dvooicemi parallel to the axes. cigarette.

The ends of the cigarettes or the ends of the cigarette bundle are then covered by folding the flaps formed by the edge portions of the metal foil blank extending over the edges of the side walls of the wrapper, first folding the flaps on the shorter sides of the side edges. then bend the projecting flaps of the wider "cash ^for BAL, UMIST ^ene in the extension of the wider ^{No. b} no ST ^{E h} n it penetrates the package.

To remove the cigarettes from the hinge-lid packs, the upper side of the pack is partially opened by first opening the lid attached to the hinge box, and then opening one end of the bundle of cigarettes by tearing off a piece of metal foil of the inner wrapper. To this last operation, i.e. detachment of the inner sheet facilitated, the breakaway portion of the metal foil řaáou crimped notches which utnad ^d UUI en detachment of ^{F s} in ^the back ^and Ne · region.

The tear-off portion is formed on the top of the front wider wall of the inner shell and on the flap extending therefrom and folded to the top front side of the cigarette bundle as indicated in the following exemplary embodiments of the apparatus of Figure 1.

Thus, in order to facilitate tearing off the portion of the inner packaging, it is necessary that the flap attached to the front wider wall of the inner packaging is not covered by the opposing flap, extending from the rear wider walls, in other words, during packaging. · Closing the bundle of cigarettes and folding the upper flaps, the closing operations have been adjusted so that the flaps extending from the front wider wall and to be peeled off are the last to be folded.

Such folding of the flaps is carried out by the apparatus of the invention described below, which is part of a cigarette packer machine with a hinge-lid pack shown in the box. 2.

In this drawing only a rotatable head is shown which performs various firing operations with a cigarette sap. ^US-P ro drawbar forming ^a ^ i ^] ^ ⁱ n ^{y b} not on the cigarette bundle and the ^Y formed by groups of cigarettes to Bádice head not shown because the MADI conventional construction, which is known in the art.

The first of these blending heads, located to the right in the drawing, is supported by a horizontal shaft and forms a station at which cigarette bundles are wrapped with a metal foil of the inner wrapper. The second rotary head, supported by the shaft, is located behind the first rotary head and is a station at which the groups of cigarettes, if required, are provided with a state mark or label. Cigarettes přecházeeí then into a third rotary head which is supported also vertically ^{EZ h} of manufacture elem ^d and ^D of ^Z při.v ^{paresis and} give the Tertön ^to EHO. · The fourth ^and last swivel head is supported by horizontal hřídeeem and helps create a cardboard blanks box with hinged lid.

The method of packaging, which is referred to as a toll packaging method, is also used to form the outer casings of soft cigarette packs, especially in the United States, and uses this packaging method on its machines that have a tampon. high packiquency of the packaging, also the applicant, i.e. Frm G. D, Socčetá pe ¹ Azěonň; this method of packaging is described, inter alia, in Czechoslovak Patent Specifications Nos. 189 655, No. 191 904 and No. 161 839.

The hinge-lid pack of cigarettes packed with a hinged lid has substantially the same construction as the soft pack cigarette packer described in the aforementioned patents. The same design is particularly effective for forming and conveying groups of cigarettes, as well as a first rotatable head which wraps the groups of cigarettes with a metal foil wrapper.

In this Zn ^and m ^{s him} onstru ^{at the} CN ^{¹H o} ^ TV ° ^of en ^s machine ^B Al ^en i ^ Garet ^d ° ^m EK alkyl ^{CH of} Balu ^the rotary ^hl in ^and ot ^and C in the direction ^P oh ru Bu ^{y C} i ^{c to} e ^ todinoý přeruě ^{Ana o and a} NTI ^{and m} i the axis of radial compartments spaced along its perimeter.

At each rotation comes from one such compartment to the inlet station called hundred · ^ C ^ which is vertically and mrizon-aligned with the linseed displacing ^c t r ^t M in her ^{j d} p ^ro VWA ^^ Cupin ^with cigarettes of ^d k ^ em separation Otomo ^{h ldvy,} BC ^{No. CEM SKU or} when ⁿ y g? ^{et ith} o ^u l ^{VK falling convection pass,} y has a metal foil. <

As is known in this apparatus, groups of cigarettes are displaced longitudinally to the individual compartments and rotated so that their edges or edges are parallel to the axis of the rotatable head.

When rotating the swivel head, stationary and movable swiveling means are provided to sweep the wrapping material around the four longitudinal sides of the group of cigarettes and, after bending the flaps extending from the narrower sides of the wrapper, overlap a portion of the front side of the group.

Thereafter, flaps exiting from the wider sides of the olla are bent and folded to the front of the cigarette bundle, first bending the top flap considered in the direction of rotation of the rotary lumen and then the bottom flap.

In this sequence of bending operations, the final wrapping operation can be carried out in the simplest process and in the shortest time, rather than the reverse sequence.

In this manner of packaging, the bending of the last flap, located opposite the wider side of the oLlu and in the wiping direction шгш, can be carried out with a rigid, rigid bending element when transporting the compartments from one to the next position.

This shows that when the package is ejected from the pivot head along a horizontal plane located diameerally to the inlet station, the upper flap of the metal foil wrapper is folded partially over the lower flap.

For these reasons, as will be discussed below, the possibility of merely repositioning to a cartoning machine with a hinged lid must be avoided, and the folding used in the soft package packaging must be replaced by folding, with the front knob being folded last. In lager wrapping machines, groups of cigarettes wrapped in a metal foil of the inner wrapper are moved between two successive rotatable heads mounted on the vertical axes along the horizontal support surfaces in the position in which they came out. first swivel heads.

The face of the inner wrapper comes into contact with the second rotatable member or the rotatable head mounted on the vertical shaft with the side of the cardboard blank which, upon completion of the painting operations, will form the back of the package with the hinged lid as shown in Fig. 1.

In conclusion, by using the swivel heads described in the cigarette packer or hinge-lid pack machine shown in Figure 2, a hinged-lid pack is formed which is different from the example shown in Figs. That is to say, known swivel heads are formed in packages whose rear flaps partially overlap the front flaps extending from the front wider side of the inner lin and forming the displaced Mst of the inner shell.

UKo-Lem invention is for-treatment device in which the SM ^ lu, allylamino its rearward miožno ^p ou ^already TV packaging Soro cigarette packaging into boxes with hinged lid and packaging vníOřního wrapper of metal foil, přieemž swivel head they should be identical to the head used in the machine for wrapping cigarettes in soft packs.

The present invention, m ^{and s} 0ak solve the fogging of the internal displace ^. coating of metal ^{e f Olie,} which in cooperation with the embossing station rotatable head bent · flap connected to the top side over the flap to the lower side of the package relative to the horizontal plane.

These objects are solved by a device according to the invention which carries out the folding of the upper parts of the inner packaging and which is part of a cigarette packaging machine having a lid connected to the main part of the packaging by a hinge, the machine essentially comprising several stations. otylation of a packaging material, each station being provided with individual compartments for inserting single groups or groups of cigarettes that are in each case. be packaged, with rigid, non-movable means for generating olyls on the lamina and for folding said matte around the group of cigarettes, with the means of transporting the subsequent groups of cigarettes and the tight packaging aattails from one lumen to the next. The apparatus is further provided with a drive kinematic mechanism, comprising a stepping mechanism for pivoting the drum by intermittent motion and comprising a continuously rotating shaft, a driving device for movable flaps folding elements and a drive device for conveying elements, at least being connected to the continuously rotating shaft one pair of movable flaps bending elements, each consisting of two movement knives located on opposite sides of the drum in the station; the folding blades or knives are attached to a rocking mechanism, pivoted by a kinematic mechanism connected to a drive cam connected to a continuously shaking shaft.

The sub-nets of the device according to the invention are characterized in that the drive cam for moving the knife or blade to the desired movement is positioned in the direction of rotation behind the feed drum and is connected to the infeed kinematical drive mechanism via a pivotable pivot member around a fixed point. rotation; the cam is provided with a cam follower, the working cam of the cam being adapted to drive the attached folding knives and fart them to stop during the first swivel movement, while the second swiveling movement in the direction opposite to the first swivel movement introduces the folding knives to the starting position, the third oscillating movement is in the same direction as the first oscillating movement and the fourth oscillating movement is performed in the same way as the second oscillating movement.

The main advantage of the invention is that it provides a device that can be used in a wrapping machine for wrapping cigarettes in cartons with a hinged lid and for wrapping in an inner metal foil wrapper, the rotatable head being identical to the head used in the wrapper cigarette .

DETAILED DESCRIPTION OF THE DRAWINGS FIG. 1 is an axonomeeric view of a cigarette pack comprising a hinge-lid box that is folded away to see and an inner shell, FIG. 2 axonommerický view Bauci machine for packing cigarettes in packs and boxes with hinged lid, ar · ^1. Fig. 3 is a perspective view of a drive apparatus for moving the machine of Fig. 2 and actuating the apparatus of the invention; Fig. 4 is a perspective view of a drum or wheel of the machine for cutting. and FIG. 5 is a representation of a motion chart of machine cycles of the most important parts of the cigarette packaging machine and apparatus of the invention.

A cigarette packer or packer with a lid for hinges and inner packagings, which is provided with a device for better closing the inner packagger, is provided with a drive mechanism comprising an electric motor 6, on whose shaft 2 and the pulley a belt transferring belt is mounted. the movement of the shaft 2 on the second pulley (4, 4), which is mounted on a horizontal drive shaft 5, which is provided at its opposite end with a first gear 6 (FIG. 3).

The first gear 6 transmits the movement via the intermediate gear 11 to the second gear 8, which is mounted on the right end of the driven shaft 5, equal to the drive shaft 5. Two driven cams 60, 11 are mounted on the driven gear from right to left. provided with a cam groove, the purpose of which will be described later. At the left end of the driven shaft 2 of the ^e-pressed commonly known ússrojí £ 2 seesásváicí segmmntu of curved and freely rotatable rollers for intermittent contact with osmiramnnným mmlSézským cross 13th

The crosshair 13 is attached to a cylindrical sleeve 64 to which a cylindrical swivel head or a rotary drum 44 is attached on the other side in detail. FIG. the rotary drum 15 packs the groups of cigarettes into a soft inner wrapper of metal foil.

The first rotary drum 15, to which groups of cigarettes are fed by the rotatable feeder element (FIG. 2), again dwelled cigarettes to the second rotary drum 64 mounted on the vertical

М ^ еИ. The first rotating drum. 15 is rotated intermittently at each indexing circumferential travels at ^H el to 45 ° ^and at its ^b by the water provided by eight tol ^ r ^ rozletěnými left ^{£ 8 »1г п} ^ ^п ^ are circumferentially spaced at regular distances apart.

. The first rotary drum 15 is substantially. formed by two coaxial and spaced apart disks 19, the spacing of which corresponds to the length of the cigarette; the two disks 19 are connected to one another by cross bars 21 parallel to the axis of rotation of the first drum 15,

The sections 18 formed by circumferential cut-outs of the drum body 15. they are adapted to receive a parallelepiped body in which the cigarettes of the respective group are placed side by side parallel to the axis of rotation of the first drum. These compartments are provided with an inlet opening located on the cylindrical peripheral surface of the first drum 15 and open at two opposite longitudinal ends.

To the right of the first rotating drum 15 as viewed in FIG. 4, along a vertical ^plane in a conventional manner fed ^P series řířezů leovové 22 of foil packing адtteit .mu.l. ^Wherein each blank 22 of metallic foil is in the corner provided with a weakened line 21, that the blank 22 forms the device described in MS. Patent no. 182 283Ab facilitate ^ ^y-understand teíhio da ^ ^ ^ pis a paresis metal 22 ^f olie'll get soaping lines, dashed lines, which flat blank 22 divided areas on different sides of the folded odppvídnjící vnntřního package. These areas or regions are indicated by reference numerals 24, £ 2, .26, 27, 28, while the same reference numerals, but provided with an index ( ') denote the terminal ^D of ^the Cass or kiop · ^ from which ^k and ^t designation says ^{whether to} be given below, the two upper parts of the inner packaging. The oceans 18 of the first rotary drum are height aligned with the inlet station.

As described in more detail in the above. Patent Nos. 189,655, No. 191904 and ^{f. 16} > 1,839, respectively. the group ^Y a C Garet in a direction perpendicular to the axis of the first rotatable ^eh of ^b ubnu ^{1 5} and simultaneously in a direction perpendicular to the axes of cigarettes simultaneously with natu ^ m 22 metal foil into four £ 8 via potouvačr 29 spolupracuuícího with prolppsouvajčeť microns 30 which are both supported by horizontal shafts and movement! with radially and mutually opposite directions with respect to the rotary drum 6;

At the forward stroke, the slider 30 approaches rearwardly to the metal foil blank 22 (FIG. 4), which is at the entrance station 6, thus pressing the area or field 2.6 against the left side of the group of cigarettes.

When inserting a group of cigarettes, into the compartment 18 of the first drum 15, the two fields are mixed or gradually bent. on the top and bottom surfaces of cigarettes they border a group or bundle of cigarettes. Upon completion of insertion of the group of cigarettes into 18, the rewinder moves back and moves away from the first field 26 of the blank 22, while the shift 29 begins to reverse the stroke.

The group of cigarettes is held inside the garment 18 by means of rectangular plates 18, 32 which are synchronously adhered and engage the longitudinal outer side of the group which faces away from the center of the rotary drum 15.

The rectangular plates 18, 32 are formed at the ends of the arms 33, 14 pivotable in the same radial plane and fixed by means of their supports to the two disks 19, 20.

TEI-ito arms JJ, 34 is provided for each compartment 18 and all of the arms together in N, N-R ^ ^^ her two t ^y Imlrické assembly relative to the rotating heads or drums 15th

At the lower abutment of the arms 34, 34 there are rotating pulleys 35 which oscillate from the cam member described in U.S. Pat. U.S. Pat. No. 189 655, on the arms JJ, 34 and in this manner! inserting and ejecting the rectangular inserts 31. 32 to Section 18.

By sliding the group of cigarettes around the inserted rectangular plates 31, 32 while the compartment 18 is still at the entry station I, the two flaps 66 'are folded over the edge of the group of cigarettes toward their front sides.

Thereafter, the rotary drum 15 is rotated clockwise and the first compartment 18 is moved to a second station II offset from the inlet station 6 by a circumferential angle of 45 °.

In the second stardec II, flap 2/4. vyčnívvjící of odddlu nuvaauúící 18 and to the part 22 during ^{the cut metal} foil, ^and covers ^h iodide and base side of the group of cigarettes is folded down .směrem BC ^j HYB ^and what J6 that has .profile L-shape, in a tangential direction to the cylindrical peripheral surface of the rotating drum Thereby folding the flap 26 around the outside of the group of cigarettes.

The first rotary drum 15 is then rotated to the third station. which is offset relative to the insertion side by an ^{angle of} 90 [deg.]. In this osledním ^{p p p} ootočení efore ^op · uštčním 2A přehýbačcm flap 36 is folded flap 28 of the fixed guide ££ action which is arranged to konccnnricky · rotating drum 15 and the drum periphery discloses £ 5, starting from the second station II to the fifth station IN.

In these phases of the wrapper, the two rectangular plates are engaged in the wrapper as support elements against the action of the folder 16 and the rigid guide to prevent damage to the cigarettes while allowing a sharp corner to be formed between the regions 24, 22 and between. flap 28 and &lt; 27 &gt;.

When ^ρ řeoistovár.í section 18 of the second station II to the third station II £ · come into engagement with said cam elements which open the shoulders · £ 3 and £ 4 íytouvvlí rectangular plate 21, £ 2 beneath the folded flaps 24, .28.

The cigarette bundle, partially wrapped in the metal foil blank 22, is rigid, stationary. 37 to keep it from falling out of Section 18.

The contemplated compartment 18 is then rotated to the fourth station IV. At the fourth station IV, the fixed guide 44 is interrupted to allow the insertion of the block member 43 which performs a rocking movement into which the device described in said U.S. Pat. U.S. Pat. No. 189 655.

The block member 48 is initially rocked and brought near the bundle of cigarettes to act on and hold the folded flaps 24, 28 in this folded position. The flaps 24 ', 28' which. the flaps 24, 28, then fold over the edge of the cigarette bundle and press against its front side.

These operations are carried out by means of the rocker 11, wherein only one of them is shown in the example of FIG. The rocker benders 39 are described in more detail in the aforementioned U.S. Pat. U.S. Pat. No. 189 655.

At the end of this operation ava ^{h is LO} and 2L't which extends beyond * ^b ou oljrys of ^the Otto ^CU 19, 20 of the drum £ ý · folded over the two end faces of the cigarette bundle.

Přjhýbíání. lopy # 27 ^to the larger ^diameter emb ^ vn ^and swinging PREH ^b ací.c ^{H zu} 4 _amino} £ ^{41; kt} e ^Re from P ^s ^ c ^hook ≤ t ≤ j ^í kc ^kl of ^Walking 27 ^'p s his ^d of ^{Pla d} therein stroke and ^{Pla h} ýbnj ^{s t} and ^{to you} be of the same ^kl op ^y on protiCehlých front sides of the beam cigarette.

The folding knives 40, 41 are connected to a common rotary shaft 42 which is parallel to the driven shaft and is provided at one end with a toothed sector engaging a toothing formed at the end of a pivoted member which is in the form of a triangular plate 44, The other apex is rotatably mounted at a fixed pivot point or at a pin 45 fixedly coupled to the machine frame. A third apex of the plate 44 is provided with a follower 46 which is guided in the cam groove of the cam disc 40.

.Excentrická annular groove cam plate 10 .is formed such that it at the end of its forward stroke of the swinging folding knives zásSávají.oba £ 0 £ 1 state until ^the NCI to incomplete řehnutí Kio ^{p p p p} 25 * res contour protruding discs otau ££, 20 I ££ otcéného in ^e direction against the direction of movement of the rotating rotary drum ££.

They are bent clones ^py 25 / ee ^p rov ^and di- second areola 'above ^alkyl MV ^{characterized} eh uňeh ^ acide ^{cutting action} in 4 ⁷ to ^{8 who} Ré ^pr ůběhu ^its him AM-lane zdvid folded DW ^kl by ^Py _<2 £ ^{/ to} first two-ICI NDU £ ⁰ £ j. which in this operation are a rigid thrust washer and whose task is essentially the same at the moment with the function of the plates 11. The second pair of knives 71, 8 is connected to a common shaft 49 on which a gear 50 is formed. 0 engages in a toothed sector supported by a single lever 51 fixed to the drive shaft. 52, fixedly coupled to the second lever 11, provided with a follower engaging into the cam groove of the cam disc.

The first pair of knives 40, 41 during the backward stroke of the follower is pulled out from underneath the flap 26, which then remains on the lower flap 27.

During the backward stroke of the second pair of knives 47, 48 and before they come out. from the engagement with the frontal suture, both the blades 0, 3, 3 are pivoted again. first pair and overlap flap 25 '. .

Permanent presence of members; which are sealed to both ends of the bundle of cigarettes and both ends of the wrapper have, during the wrapping of a group of cigarettes, a basic task and a basic function, namely that the folded flap 26 is in a direction opposite to the direction of movement Could be captured at the beginning of the rotary movement of the knives.

As soon as the block member 8 comes out of engagement with the regions 24, 2 &apos; of the blank .22, that is, once its υ ^ οΐ, Ερορ · ^^. ’! In holding the group of cigarettes and, in the case of a sunny pack, inside the cylinder 8, the rotating drum 44 is rotated again to move the considered section 8 into the fifth elevation station.

Adhesion k. ^L o ^p 2 / '. ^k prot ¹ . ¹ EH ^{characterized} ýiii ^No microns frontal sides lingers. eye is .rěma ^ i during the initial phase forms totoio ttl.e ^{p d} n c · ^N, N-viv přemislování using no pair ^ZU 44). 4JK ktir ou ^{E are} still retained on víJší čós.i section even during 'the return stroke e. E didr then ^J cofactors k.lo ^p. £ 4 "£ 5' zajišdvánc paragraph on ^{p. I} ^ Ι Γίοοοάπ.ίkovými ostranními ^p. 4, 55, one of which is shown in FIG. 4, which are attached. with a steep, rotating drum.

In the fifth stage V, which is opposite. Inlet weakening 1, the packed group of cigarettes is ejected by the ejector 66 which performs reciprocating movements and moves in a radial direction with respect to the rotary drum 60. The ejector 56 engages in the usual manner on the inner side of the packed bundle while the opposite ejector. abuts against the light outer side of the packaged bundle. The wrapped cigarette bundle is thereby ejected onto a vertically and reciprocating movable elevator 8 which reaches the level of the retractable fifth station V in its highest position.

'svátor 2 ⁸ polι ^{t t} p ^p c h ^a r ^etjc pretidhlým zdvidcím rvkem 2 ^{p 7,} which rests on top of the carton, wrapped bundle of cigarettes is conveyed downward toward the end of its ^ R ^^ i ^ ¹ ^ z.dv d ° ^P Ravi wrapped bundle into one of the compartments 60 ⁱⁿ dг Уéh ^oo t ^{of the} undispersed bu.b ⁿ u £ L mounted on the vertical shaft.

Graph ^on dr. ⁵ ddimticky illustrates the function of the ^p olečn ^é it driveshaft ^{1 eg.} Rotary shaft ^Le 2, prijdd ^one pravidia · both ^R and ^D I ^C o ^h Yb and stored ^Ž measurement otočndo drum £ ^5, HRI ^- delete Д2 with which a first pair of knives 40, 41, and a shaft 42 are connected to which a second pair of knives 42, 48 is connected.

In the portion of the graph relating to the rotary drum 15, a portion parallel to the horizontal axis is represented which represents movement breaks that correspond to the idle periods of the rotary drum, with the shaded area representing the time period of movement. In the portion of the graph relating to the shafts 42, 49, the horizontal portion indicates the rest period, the upward portion represents the forward movement and the downward inclined portion. The line portion represents the period of time during which the backward movement occurs.

Claims (3)

SUBJECT OF THE INVENTION Apparatus for sealing an upper portion of an inner wrapper on a machine for wrapping cigarettes in cartons with a lid for a hinge, the wrapping machine comprising stations for wrapping wrapping material, each of which is formed by a rotating drum compartment for inserting individual groups or bundles of cigarettes, movable and fixed folding means for folding the wrapping material around the plurality of cigarettes, from the conveying members for moving the plurality of cigarettes and the respective wrapping material from one rotating drum to the other and from the drive kinematic device substantially comprising a step mechanism for intermittently rotating each drum; a rotating shaft, drive means for movable folding members, and drive means for repositioning members, wherein at least one of the intermittently moving devices and a pair of moving members is connected to the continuously rotating shaft. Each pair of folding members is formed by two folding knives located on opposite sides of the drum in the station, the rotary drum sections being gradually brought to rest and the folding knives are connected to the pivoting shafts rotated by a kinematic mechanism coupled to the drive cam disc. mounted on a continuously rotating shaft, characterized in that the drive cam disc (10) for actuating the folding knives (40, 41) is disposed in the direction of rotation of the rotary shaft (15) and connected to the respective drive kinematics mechanism via a rocker (44), pivotable about a fixed pivot point (45) and provided on a arm remote from the pivot point (45) with a cam groove follower (46) cooperating with the cam disc (10), wherein the rocker (44) is provided at its next apex gear engaging the cog and the functional profile of the cam disc (10) is adapted to actuate the associated folding knives (40, 41) and to move said knives (40, 41) in a first rocking motion in a direction opposite to that of the camshaft. the rotational direction of the rotary drum (15) to bring these blades (40, 41) to a standstill, into a second swivel movement in a direction opposite to the first swivel movement and then into a third swivel movement in a direction consistent with the first swivel movement moving in a direction consistent with the second pivoting movement to bring the folding knives (40, 41) to their initial position. Device according to claim 1, characterized in that the pivoting member (44) is formed by a triangular plate whose apexes are provided with a pivot point (4.5), a cam groove follower (46) and a toothing. Device according to claim 2, characterized in that the toothing of the pivot member (44) is formed by an arcuate toothed sector.