APPARATUS FOR WITHDRAWING ROD-LIKE ARTICLES FROM A HOPPER

Abstract: The object of the invention is an apparatus for withdrawing and singling rod-like articles, particularly filter plugs for cigarettes, or the like, contained in a feeding hopper (1), the bottom of which is at least in part formed by as rotary, possibly suction, fluted drum (2) receiving one rod-like article (B) in each one of its flutes (102) and carrying the thus collected rod-like articles out of the feeding hopper (1). The apparatus according to the invention is characterized in that within the feeding hopper (1) an either stationary or movable, flat or arcuate guiding device (6,16,26,36,24) is provided over the ascending sector of the fluted drum (2), and extends in an inclined direction, substantially tangential to drum (2), at a distance therefrom that corresponds to a multiple of the diameter of the rod-like articles (B). With the fluted drum (2), the said guiding device forms a duct having at least one convergently shaped inlet end (21, 22).

Description: The object of the invention is an apparatus for with­ drawing and singling rod-like articles contained in a feeding hopper, the bottom of which is at least in part formed by a rotary, possibly suction, fluted drum receiving one rod-like article in each one of its flutes and carrying the thus collected rod-like articles out of the feeding hopper, where it generally transfers them to a successive conveyor for their further use. More particularly, the invention refers to an apparatus of the above-disclosed type, for withdrawing the filter plugs used in the manufacture of filter-tipped cigarettes. The known apparatus of this type have the drawback that at the desired high speeds of withdrawal by, and then of rotation of the fluted drum, the flutes in said drum are irregularly filled, especially owing to the bridges that tend to be formed in the mass of the moving rod-like articles contained in the hopper. The fact of leaving some drum flutes empty brings about some problems in the subsequent use of the rod-like articles. The object of the invention is to eliminate the above-said drawback, and to impart a rolling movement to the rod-like articles lying within the hopper in a zone that is adjacent to the drum and extends over a wide sector thereof, so as to surely avoid the forming of bridges, while simultaneously applying on the rod-like articles also a force being substantially directed radially toward the drum, so as to promote the insertion of said articles into the flutes in said drum. To this end, according to the invention, at the inside of the feeding hopper a guiding device is provided over the ascending sector of a the rotary fluted drum, and extends in an inclined direction substantially tangential to the drum, at a distance therefrom that corresponds to a multiple of the diameter of the rod-like articles, and with the fluted drum the said guiding device forms a duct having at least one convergently shaped inlet end. The guiding device may be, as a whole or in part, flat or arcuate, with the concave side turned toward the drum, and in any case it applies on the rod-like articles a pressure being directed radially toward the fluted drum, when the mass of moving rod-like articles penetrates in the convergently shaped inlet or inlets of the duct formed between the guiding device and the fluted drum. The guiding device according to the invention may be an immovable device, so that it forms a stationary flat or arcuate surface on which there roll the rod-like articles making up the adjacent layer of the mass of rod-like articles filling the duct between the said guiding device and the fluted drum. The rolling of the rod-like articles in the layer that is adjacent to the immovable guiding device, is transmitted also to the other rod-like articles which are thus kept moving, whereby the forming of bridges is avoided. This effect of moving the rod-like articles contained in the feeding hopper, and of keeping them moving, may be further increased, according to the invention, by imparting the guiding device its own motion, such as, for example, an alternate oscillatory motion and/or a motion of translation in the longitudinal direction of the said guiding device. Such a longitudinally translational motion may be a continuous motion in the same direction, for example, in the direction being concordant with , or opposite to the rotation of the fluted drum, or, preferably, it may even be an alternate motion, and can be obtained in a particularly simple manner when the guiding device is made in form of a band. These and other features of the apparatus according to the invention will appear in the claims and in the following specification of some embodiments thereof, which are diagrammatically shown by way of non-limiting examples in the annexed drawings, in which: Figure 1 is an elevational view showing a first embodiment of the invention. Figure 2 shows a variant of the embodiment according to figure 1. Figures 3 to 6 are elevational views showing four further embodiments of the invention. In all the figures, by numeral 1 it is designated a hopper for feeding filter plugs B to a filter tip-applying machine for the manufacture of filter-tipped cigarettes. At least part of the bottom of said hopper 1 is formed by a known drum 2 which is so driven as to be rotated in the direction of arrow F1, and is peripherally provided with flutes 102 that can each contain only on filter plug B. The flutes 102 in drum 2 are preferably provided with ports (not shown) through which suction is applied at least in correspondence of the hollow of hopper 1 and over a certain distance downstream thereof. At the side from which the fluted drum 2 comes out of hopper 1, a so-called repelling roller 3 rotating in the same direction as drum 2, is arranged between the wall of said hopper and the drum 2, and has the function of pushing back the filter plugs B not contained in the flutes 102 in drum 2, and of preventing them from getting out of the hopper. In the embodiment according to figure 1, at the interior of hopper 1 a tile member 4 shaped like an overturned V, is provided over the ascending sector of the fluted drum 2, and is secured to a shaft 5 which is imparted an alternating rotatory motion, so that the tile member 4 is caused to swing according to the double arrow F2. A guiding device of flexible material, consisting of a band 6 made, for example, of plastics or of a fabric, is passed around an idle guide roller 7 and by its ends is fastened to the wings of the swingable tile member 4. At the interior of hopper 1, the guide roller 7 is arranged in such a fixed position that the band 6 presents an inclined branch 106 turned toward the drum 2, and extending over the drum in a substantially tangential direction to the ascending sector of said drum. The other branch 206 of the guiding band 6 may be substantially vertical. The length of the guiding band 6 is greater than the strictly required development, that is to say, the band 6 is so loosely led about the guide roller 7 as to permit the swinging motion of the tile member 4. The swinging of the tile member 4 brings about a corresponding longitudinal alternate movement of the two branches 106 and 206 of band 6, particularly of the inclined branch 106, according to the double arrow F3. Moreover, thanks to the band 6 being loosely fitted on, its branch 106 turned toward the fluted drum 2, takes a more or less arcuate shape owing to the mass of filter plugs B normally filling the duct formed between the fluted drum 2 and the branch 106 of band 6, as shown by dash-and-dot lines. The average speed of the longitudinal alternate movement of the branch 106 of band 6 is preferably higher than the peripheral speed of drum 2. During the operation, the tile member 4 regulates the flow of the filter plugs B toward the drum 2, through the two openings 101 and 102 formed in hopper 1 at both ends of said tile member 4, and adjusts the said flow to the withdrawal by the fluted drum 2. Moreover, the tile member 4 prevents the mass of filter plugs B contained in hopper 1 from applying an excessive pressure on the fluted drum 2. The band 6, particularly its inclined branch 106, defines relatively to the drum 2, a duct having two flaring ends, that is to say, two convergently shaped inlets 21,22. Through the respective convergent inlets 21,22 of said duct, the mass of filter plugs B having flown through the openings 101 and 201, penetrates between the drum 2 and the branch 106 of band 6, thus producing the said bending of the branch 106. Thus, the branch 106 of band 6 applies on the filter plugs B some forces being directed radially toward the drum 2, and which help the insertion of the filter plugs into the flutes 102 of drum 2. At the same time, the longitudinal alternate movement of the branch 106 of band 6 keeps moving the mass of filter plugs B lying between the drum 2 and the branch 106 of said band 6, more particularly, it exerts on the said filter plug mass a disengaging action that prevents the forming of bridges. More precisely, the filter plugs B that from the layer into contact with the branch 106 of band 6, are caused to roll over themselves by the longitudinally sliding movement of the said branch 106 of band 6, and entrain in rotation also the other filter plugs into contact therewith. Also a circulating movement may occur in the mass of filter plugs B contained between the fluted drum 2 and the inclined branch 106 of band 6, as shown by the small arrows in figure 1. Anyhow, the combined action of pressing and entraining in movement (disengagement) as exerted by the inclined branch 106 of band 6 on the said mass of filter plugs B, is so efficient as to render extremely small the probability of a flute 102 in drum 2 remaining empty, even at the highest operative speeds. The modified embodiment according to figure 2 presents a similar operation, and is carried out substantially in the same way as described by referring to figure 1, like or equivalent pieces being designated by the same reference numerals. The guiding band 6 is led about a cylindrical weight 8 that is provided in place of the guide roller 7, and is so mounted as to be vertically slidable along a fixed rod 9. The working length of said rod 9 is adjustable, more particularly, the rod is slidably passed through a support 10 to which it can be locked in any suitable position, for example, by means of a locking screw 11. The slidable weight 8 for guiding the band 6 acts as a stretcher of said band 6. As an alternative, or in addition to the vertically slidable guide weight 8, small weights 12 that increase the pressure as exerted by the branch 106 of band 6 on the mass of filter plugs B toward the drum 2, may be applied on the inward side of this branch 106 of band 6. In the embodiment according to figure 3, at the inside of hopper 1 an arm 13 is provided over the fluted drum 2, and is inclined upwardly in the direction F1 of rotation of said drum 2. This arm 13 is pivotably mounted on a shaft 113 provided at the upper end on said arm 13, as shown by the double arrow F4 and by another angular position, in dash-and-dots lines, of arm 13. The arm 13 carries an endless band 16 led about an upper pulley 14 which is co-axial to the shaft 113 for the pivoting movement of the arm, and about a lower pulley 15 provided at the lower end of said arm 13. The upper pulley 14 is driven and can impart the endless band 16 either a continuous motion, in the direction being concordant with, or discordant from the direction F1 of rotation of the fluted drum 2, or an alternate motion Owing to its own weight and possibly owing to additional elastic means (not shown), the assembly of arm 13 and band 16 applies a pressure being substantially directed radially, relatively to drum 2, on the mass of filter plugs B contained between the inclined lower branch of band 16 and the fluted drum 2. The possibility of arm 13 to yield upwardly by pivoting around the shaft 113 prevents any excess of pressure on the filter plugs B. The lower branch of the endless band 16 substantially performs the same function as the inclined branch 106 of the band 6 according figures 1 and 2. In the embodiment according to figure 4, an endless band 26 is led about three guide rollers 17, 18, 19 arranged inside the feeding hopper 1 over the fluted drum 2. Between the two guide rollers 18 and 19 lying on a straight line which is parallel to a tangent to drum 2, a plurality of guide rollers 120,220 are provided and are arranged in two offset, substantially parallel rows. The endless band 26 is passes around these guide rollers 120,220 so as to be caused to follow a tortuous path which as a whole may have a rectilinear configuration, or, as shown, an arcuate configuration, with the concave side turned toward the drum 2. All the guide rollers 17,18,19,120, and 220 are mounted in fixed positions, so that the pressure as applied on the filter plugs B in the radial direction to drum 2, essentially results from the mass of filter plugs penetrating between the drum 2 and the guiding band 26 through the convergently shaped inlets 21 and 22 of the duct formed between the drum 2 and the band 26 in the areas of the guide rollers 18, 19. The loops in the tortuous path of band 26, which are open toward the drum 2, are of such a width at their openings between the guide rollers 120, that they can accomodate any excess filter plugs B in the case of an excessive pressure being applied on the filter plugs in the radial direction to drum 2, and therefore these loops act as a sort of relief means. One of the guide rollers, for example, the roller 17, is driven, and imparts the band 26 either a continuous motion being concordant with, or discordant from the direction F1 of rotation of drum 2, or an alternate motion, thus promoting the desired movement of the mass of filter plugs between the drum 2 and the tortuous path section of band 26. In the embodiment according to figure 5, over the fluted drum 2 and below a stationary or preferably swingable tile member 4 shaped like an overturned V, there is arranged a roof structure 23 having on its underside a preferably flat surface 24 that is inclined upwardly in the direction F1 of rotation of drum 2. In this embodiment, the pressure on the mass of filter plugs B in the radial direction toward the fluted drum 2, substantially results from the convergent shape of both inlets 21,22 of the duct formed between the flat surface 24 and the drum 2. The roof structure 23 and its flat lower surface 24 may then be stationary, but they may also be imparted an oscillatory motion according to the double arrow F5, around an upper pivot 123 provided, for example, at the apex of the roof structure 23. In this case, a pulsanting pressure on the mass of filter plugs B contained between the oscillating flat surface 24 and drum 2, is obtained. In the embodiment according to figure 6, an air permeable endless band 36 is provided, and is passsed around three guide rollers 27,28,29. The rollers 28 and 29 are so arranged that the branch of band 36 which lies between these rollers 28 and 19, inclinedly extends over the fluted drum 2, and is parallel to a direction being tangential to the said drum 2. Both roller 27 and 28 are mounted in fixed positions, while the roller 29 has the function of tension roller, and is carried by an arm 25 which is so mounted as to be pivotable about the shaft 125, and is urged by a pulling spring 30. At least the inclined branch of band 36, between the two rollers 28 and 29, runs on a suction box 31. One of the guide rollers, for example the roller 27, is driven, and drives the endless band 36. When only the suction box 31 is provided between the guide rollers 28,29, the motion of band 36 may be either a continuous motion in the direction being concordant with, or opposite to, the direction F1 of rotation of drum 2, or it may be an alternating motion. Suction boxes 32,33 may be however provided also or only in correspondence of the other branches of band 36, i.e., between the rollers 27,29, and 27,28, as shown in figure 6. In this case, the band is continuously moved in the direction being concordant with the direction F1 of rotation of drum 2, that is to say, in the direction of arrow F6. Also in the embodiment according to figure 6, the pressure on the filter plugs in the radial direction toward the drum 2 is applied owing to the convergent shape of both inlets 21,22 of the duct formed between the drum 2 and the branch of band 36 which is stretched between the rollers 28,29. The movement of the filter plugs B resulting from the motion of band 36, is obtained owing to the fact that through its sucking action, the band 36 takes up and drives along the layer of filter plugs adhering thereto, which in turn move and entrain the other filter plugs. In the embodiments according to figures 1 to 4, the moving bands 6,16, and 26 drive along by friction the filter plugs into contact therewith and/or cause the same to roll over themselves, as previously described.

Claims: 1. An apparatus for withdrawing and singling rod-like articles, particularly filter plugs for cigarettes, or the like, contained in a feeding hopper (1), the bottom of which is at least in part formed by a rotary, possibly suction, fluted drum (2) receiving one rod-like article (B) in each one of its flutes (102) and carrying the thus collected rod-like articles out of the feeding hopper (1), characterized in that within the feeding hopper (1) a guiding device (6,16,26,36,24) is provided over the ascending sector of the rotary fluted drum (2) and extends in an inclined direction substantially tangential to the drum (2), at a distance therefrom that corresponds to a multiple of the diameter of the rod-like articles (B), the said guiding device forming, with the fluted drum (2), a duct having at least one convergently shaped inlet end (21,22). 2. The apparatus according to claim 1, characterized in that the guiding device (16,24,36) is flat. 3. The apparatus according to claim 1, characterized in that the guiding device (6,26) is arcuate, with the concave side turned toward the fluted drum (2). 4. The apparatus according to any one of the preceding claims, characterized in that the guiding device is stationary. 5. The apparatus according to any one of claims 1 to 3, characterized in that the guiding device (6,16,26,36,24,) is imparted its own motion. 6. The apparatus according to claim 5, characterized in that the guiding device (6,16,24) is imparted an oscillatory motion. 7. The apparatus according to claim 5, characterized in that the guiding device (16,26,36) is imparted a translational motion in its longitudinal direction. 8. The apparatus according to claims 5 and 7, characterized in that the longitudinally translational motion of the guiding device (16,26,36) is continuous in the direction being concordant with, or discordant from, the direction of rotation of the drum. 9. The apparatus according to claims 5 and 7, characterized in that the longitudinally translational motion of the guiding device (16,26,36) is an alternate motion. 10. The apparatus according to any one or more of claims 5 to 9, characterized in that the average speed of the movable guiding device (6,16,26,36,24) is greater than the peripheral speed of the fluted drum. 11. The apparatus according to any one or more of the preceding claims, characterized in that the guiding device consists of a band length (6) fastened by its ends to the two wings of a tile member (4) shaped like an overturned V, which is arranged within the feeding hopper (1) over the fluted drum (2), and is imparted a swinging motion around a shaft (5) for the swinging thereof, provided in the region of the apex of the said tile member (4), the band length being so guided as to present a branch (106) extending over the ascending sector of the drum (2) and being inclined upwardly, in the direction of rotation of said drum (2). 12. The apparatus according to claim 11, characterized in that the band length (6) is guided on at least one stationary roller (7). 13. The apparatus according to claim 11, characterized in that the band length (6) is guided on a cylindrical weight (8) which is vertically shiftable and, for example, is slidable along a vertical rod (9) which in turn may be adjustable in height. 14. The apparatus according to any one or more of claims 11 to 13, characterized in that the length of the band (6) is greater than the strictly required development, whereby its branch (106) turned toward the fluted drum (2) can be incurvated by the mass of rod-like articles (B) contained in the duct formed between the said branch (106) of the band (6) and the drum (2). 15. The apparatus according to any one or more of claims 11 to 14, characterized in that the weight of the band branch (106) turned toward the fluted drum (2) may be increased, for example, by means of small weights (12) applied on its side lying opposite to the drum. 16. The apparatus according to any one or more of claims 1 to 10, characterized in that the guiding device consists of an endless band (16,26,36) that is so guided as to present a branch extending over the ascending sector of the fluted drum (2), and being upwardly inclined in the direction of rotation of said drum, one roller (14,17,27) for guiding the band being driven with an either continuous or alternate rotatory motion. 17. The apparatus according to claim 16, characterized in that the endless band (16) is guided on at least one roller (15) carried by a pivotable arm (13), and on a driven roller (14) provided co-axially to the shaft (113) around which the arm (13) pivots, the arm (13) being urged by gravity, and possibly also by elastic means, toward the fluted drum. 18. The apparatus according to claim 16, characterized in that in correspondence of its inclined branch turned toward the fluted drum (2), the band (26) is guided on a plurality of rollers (120, 220) or pivots, so as to be caused to follow a tortuous path. 19. The apparatus according to claim 18, characterized in that the openings in the tortuous path loops, which are open toward the fluted drum (2), are so wide as to permit the passage of at least one rod-like article (B). 20. The apparatus according to claim 16, characterized in that the band (36) is air permeable, and at least its inclined branch turned toward the fluted drum, is led over a suction box (31). 21. The apparatus according to any one of more of claims 1 to 10, characterized in that the guiding device is constituted by the flat or arcuate lower surface (24) of a stationary or swingable roof structure (23).

Inventors: MANGIAROTTI, LUIGI, SPADA, VALTER
Applicants: SASIB S.P.A.
Application year: 1987
Main classification: A24C5
IPC codes: B65G47, A24C5