Machine for storing paper articles in counted piles

Abstract: Machine for the storage of paper articles in numbered piles, comprising: a unit (1) for feeding the paper articles (2); a unit (3) for collecting the individual articles coming from the unit (1); also comprising a unit (4) for counting and forming numbered piles (6) of articles coming from the unit (3), comprising means for transferring the formed piles (6) to a conveyor unit (5) while continuously maintaining said piles between two lateral containment surfaces.

Description: Sector of the invention The present invention concerns a machine for the storage of paper articles, more precisely paper tissues or serviettes that have to be collected in counted piles for subsequent transport and packing if necessary. In particular the invention is designed for the storage in numbered piles of paper tissues already folded in a previous folding phase. State of the art At present various machines are known designed to receive a succession of sheets already folded by a line upstream, count them and collect them in numbered piles ready for a transport device by means of which they are conveyed to a packing station, if necessary. The machines currently used are limited by the relatively low productivity of the phase in which the numbered pile is formed, which affects the overall efficiency of the operation. The machine described in the German patent DE 3 700 930 A registered in the name of Giebeler GMBH attempted to provide an initial solution to these limits. The patent describes a machine for storing and counting paper articles fed by a sector disc. The machine comprises a blocking element that intercepts the sheets, causing them to pile up alternatively on two moving horizontal plates positioned below, until a pile containing the required number of sheets is obtained on the plate. The mechanism used ensures that, once the required number of sheets is reached, the second plate replaces the first one in the collecting position and the first one is lowered until it meets a conveyor belt. The pile formed is then deposited on the belt to be moved to a subsequent packing phase if necessary. The solution described has a number of disadvantages, however, connected with the fact that, when operating at high frequencies, for example 180-200 piles per minute, it is not possible to guarantee correct movement of the piles formed and deposited on the moving plate, which therefore tend to lose their original order making the subsequent transport and packing phases more difficult with the further risk of continuous jamming of the system. In addition, the paper material normally used varies continuously in volume and this also causes considerable deformation of the piles. Another similar machine, although less productive, is shown in US 3 416 286 A which corresponds to the preamble of claim 1. Aim of the invention The aim of the present invention is to solve the problems encountered with machines of the known type, proposing a machine for the storage of paper articles in numbered piles with a high production rate and efficiency. Summary of the invention The invention achieves this purpose by providing a machine for the storage of paper articles in numbered piles with the features of the characterising part of claim 1. Further characteristics are illustrated in the dependent claims. List of drawings The advantages obtained will be evident from the following description and attached drawings, provided as a non-restrictive example, in which: figures 1 to 7 show a side view of a machine according to the invention in successive operating phases; figure 8 shows an overhead view of the same machine. Detailed description With reference to the attached drawings, in a preferred embodiment, a machine according to the invention comprises: a unit 1 for feeding paper articles 2 coming from a previous working phase; a unit 3 for collecting the individual articles coming from unit 1; a unit 4 for counting and storing articles coming from unit 3 in numbered piles 6; a unit 5 for conveying the numbered piles of paper articles coming from unit 4 to subsequent working phases, for example packing phases. In greater detail: unit 1 consists of a pair of opposed conveyor belts 11 which convey a succession of articles 2; unit 3 consists of a disc 30 which is basically cylindrical and provided with sectors 31 in each of which is deposited a single article 2 coming from the belts 11; unit 5 consists of a chain guide 56 provided at regular intervals with conveyor teeth 55 that provide for movement of the piles 6 formed in the formation unit 4. Again, with reference to figure 1, the movement of the teeth 55 is therefore perpendicular to the plane of the drawing. According to the invention, the pile counting and formation unit 4 consists of a fixed surface plate 41 that intersects the sectors 31 of the disc 30 in order to collect the articles 2 contained in sectors 31. The plate 41 features a first slanting section 42 and a second horizontal section 43 so that the articles 2 run against their side, at first on section 42 and then, in a vertical position, on section 43 pushed by the external curved surface of the sectors 31. The unit 4 also comprises a trolley 44 moved by a mechanism, in the case described a connecting rod and crank 59 and a servomotor 59' which provides for the horizontal movement of the trolley 44 in an alternating synchronised manner in order to control at each cycle the volume of the piles being formed; said unit also comprises a claw 45 driven by a complex mechanism 7. In the embodiment described, the mechanism 7 consists of a slide 48 which is integral with the claw 45 and can slide on an arm 47 rotating in its turn around a fixed pin 51 and is connected by a rod 49 to a jointed system 50 which provides the arm 47 with alternate vertical movement. The slide 48, in its turn, is connected by a rod 53 to a jointed system 54 which provides the slide with alternate straight-line movement along the arm 47. Referring to figures 1-7, operation of the unit 4 for counting and forming the piles of articles 2 is described below. Figure 1 illustrates the phase immediately prior to the discharge of a formed pile 6, performed by means of the conveyor teeth 55 of the outlet chain 56. In this phase the pile formed 6 is contained at the rear of the trolley 44 and in front of the claw 45; said claw remains at its rear stroke end, while at the rear of the pile formed, the trolley 44 maintains its programmed position according to the number of articles counted and the volume of the product being processed. In this phase a new pile forms between the claw and the external surface of the sectors 31 which deposit the articles 2 on the plate 41. In the next phase (figure 2) the pile 6 has been removed by the conveyor teeth 55 of the chain 56 and the arm 47 is about to begin a downward movement which begins as soon as the trolley 44 has moved forward until it reaches the position of the claw 45. In this phase the claw moves down, the slide 48 moves forward and the sheets are contained at the rear side by the trolley 44, which has replaced the claw 45, and at the front side by the curved surfaces of the sectors 31 (figures 4, 5). At the front stroke end of the slide 48 the claw 5 reaches its insertion position (figure 6) and begins an upward movement; a new pile, now positioned between the trolley 44 and the claw 45, can now be transferred along the plane 43 (figure 7) to the discharge point of figure 1. According to the invention, during transfer of the pile formed, to slide 48 and the trolley 44 have electronically synchronised speeds according to the number of articles and the type of initial product used, in order to maintain the shape of the pile 6. Furthermore, the jointed systems that provide the movement to the slide 48, the arm 47 and the trolley 44 respectively, are synchronised with the disc 3 by means of an electronic control unit so that it is possible to vary both the number of articles that form the piles and the production speed of the piles formed, while maintaining continuous control of the piles. A method for the storage of numbered piles of paper articles according to the invention comprises the following phases: a) feeding of a continuous succession of articles; b) collection of the articles fed; c) counting and formation of piles of articles; d) transfer of the piles formed to a further discharge phase; Phase c) is performed by constantly maintaining the pile formed between two lateral containment surfaces. Preferably: phase a) is performed by means of a sector disc; phase b), collection, is performed by means of a collecting plate which intercepts the articles conveyed by the sectors; phase c), counting of the articles and formation of the piles, is performed by means of a claw element that selects a pre-set number of articles already present on the collecting plate, forming a pile in combination with a second pile containment surface; phase d) is performed by transfer of the pile formed, constantly contained between two moving plates, to a discharge station. The present invention has been described with reference to preferred forms of embodiment but equivalent modifications can be made while remaining within the scope of the protection afforded by the present industrial patent rights. As an example, implementation of the mechanisms described can vary by using different elements and different arrangements; likewise the feeding and discharge phases can be obtained in an equivalent way with respect to the above.

Claims: Machine for the storage of paper articles in numbered piles, comprising: a unit (1) for feeding the paper articles (2); a unit (3) for collecting the individual articles coming from the feeding unit (1); and a unit (4) for counting and forming numbered piles of articles coming from said collecting unit (3), comprising a fixed surface plate (41) that cooperates with said collecting unit (3) in order to form a pile (6) of said articles (2), a claw (45) operated in a reciprocating manner along a substantially vertical direction by means of a first mechanism (7) in order to define over said surface plate a pile (6) with a pre-set number of articles (2), and a rear vertical surface for lateral containment of said pile (6); and a unit (5) for conveying said pile to a subsequent working phase, characterized in that said counting and forming unit (4) further comprises a trolley (44) that defines said rear lateral containment surface and that is moved by a second mechanism in a horizontal direction with a reciprocating movement between said surface plate (41) and said conveyor unit (5); and in that said first mechanism (7) is fit to operate said claw (45) in a reciprocating manner between said surface plate (41) and said conveyor unit (5), said claw (45) defining a front lateral containment surface so as to transfer an already formed pile (6) in cooperation with said rear lateral containment surface of said trolley (44) while a new pile (6) is formed between said claw (45) and said collecting unit (3), said claw (45) and said trolley (44) having synchronized speeds during the transfer, so that a pile (6) is maintained continuously comprised between said two lateral containment surfaces. The machine according to claim 1, wherein said collecting unit (3) consists of a basically cylindrical shaped disc (30) provided with sect (31) in each of which is deposited a single article (2) coming from the unit feeding (1), said fixed surface plate (41) intersecting the sectors (31) in order to collect the articles (2) contained in the sectors (31). The machine according to claim 1 or 2, wherein said first mechanism (7) consists of a slide (48) which is integral to the claw (45) and can slide on an arm (47) rotating in its turn around a fixed pin (51) and is connected by a rod (49) to a first jointed system (50) which provides the arm (47) with reciprocating vertical movement. The machine according to claim 3, wherein said slide (48) is in its turn connected by a rod to a second jointed system (54) that provides the slide with reciprocating straight-line movement along the arm (47). The machine according to any of the claims 2 to 4, wherein said second mechanism features a connecting rod and crank (59) and a servomotor (59') which provides the horizontal movement of the trolley (44) in a reciprocating and synchronized manner in order to control at each cycle the volume of the piles being formed. The machine according to claim 5, wherein the first and second mechanisms that provide movement to the slide (48), arm (47) and trolley (44) are synchronized with the disc (30) by means of an electronic control unit, so that it is possible to vary both the number of articles that form the pile and the production speed of the pile formed, while maintaining continuous control of the pile.

Inventors: TOMMASI RENZO, TOMMASI, RENZO
Applicants: RENT SRL, RENT S.R.L.
Application year: 2001
Main classification: B65B25
IPC codes: B65H29, B65H33, B65H31