Method and device for forming and transferring groups of cigarettes on a packing machine with multiple wrapping lines

Abstract: A method and device (1; 1') for forming and transferring groups (13) of cigarettes (7) on a packing machine (2) with multiple wrapping lines (20'), whereby each group (13) is fed into a respective pocket (11) of a conveyor (10), and presents a number of superimposed layers (9) fed successively into the respective pocket (11) by push elements (14) for successively expelling the layers (9) from the bottom of respective outlets (4) of a feedbox (3); the outlets (4) are equal in number to the number of layers (9) forming each group (13) multiplied by a whole number greater than one, and the conveyor (10) is moved intermittently in steps of a length equal to the spacing between two consecutive pockets (11) multiplied by the whole number; at each stop of the conveyor (10), respective layers (9) are expelled from the outlets (4) of the feedbox (3) and fed into respective pockets (11); and respective groups (13) are expelled from a number of pockets (11) equal to the whole number, and are fed to an operating unit (20) of the packing machine (2).

Description: The present invention relates to a method and device for forming and transferring groups of cigarettes on a packing machine with multiple wrapping lines. In the following description, the term "group of cigarettes" is intended to means the cigarettes forming the content of a packet and arranged as inside the finished packet. Moreover, though reference is made herein to a packing machine with two wrapping lines, the method and device according to the present invention may nevertheless be applied to packing machines with more than two wrapping lines. A group of cigarettes normally comprises twenty cigarettes arranged in three superimposed layers of six or seven cigarettes each, and it is to this type of group that reference will be made in the following description. Known packing machines with two wrapping lines, for example machines of the type shown in DE-A-2454289, normally have a device in accordance with the preamble of claim 1 and comprise an input feedbox to which the cigarettes are fed in bulk crosswise to their axes, and which comprises two outlets divided internally by partitions into a number of side by side channels equal in number to the cigarettes in one of the layers; and, in the course of each operating cycle of the packing machine, appropriate operating members provide for forming, at each outlet of the feedbox, a group comprising a given number of superimposed layers of cigarettes. In the course of each operating cycle of the packing machine, the two groups so formed are fed by a pusher, in a direction parallel to the axes of the cigarettes, into respective pockets of a conveyor traveling in steps crosswise to the axes of the cigarettes. Though the output of cigarette packing machines with two wrapping lines is normally greater than that of single-line machines, it is nevertheless limited to some extent by the characteristics of the devices for forming the groups of cigarettes for packing. That is, with such devices, the formation of each pair of groups at the bottom of the feedbox takes a relatively long time, on account of the fairly slow speed at which the cigarettes drop by force of gravity along the channels of the feedbox. It is an object of the present invention to provide a method and device enabling groups of cigarettes to be formed and transferred rapidly on a packing machine with multiple wrapping lines. According to the present invention, there is provided a method of forming and transferring groups of cigarettes on a multiple-line packing machine with a given number of wrapping lines; each said group being fed into a respective pocket of a conveyor, which is moved intermittently in steps of a length equal to the spacing between two consecutive said pockets multiplied by said given number; characterized in that each said group comprises a number of superimposed layers fed successively into the respective said pocket by push means for successively expelling the layers from the bottom of respective outlets of a feedbox; said outlets are equal in number to the number of layers forming each said group multiplied by said given number; respective layers being expelled simultaneously from the outlets of said feedbox and fed into respective said pockets at each stop of said conveyor; and, at each stop of said conveyor, respective groups being expelled from a number of pockets equal to said given number, and supplied to an operating unit of said packing machine. According to the present invention, there is also provided a device for forming and transferring groups of cigarettes on a multiple-line packing machine with a given number of wrapping lines; the device comprising a conveyor having a plurality of pockets, in each of which a respective said group is fed; and drive means for moving said conveyor intermittently in steps of a length equal to the spacing between two consecutive said pockets multiplied by said given number; characterized by comprising push means to feed successively a number of superimposed layers into the respective said pocket for successively expelling the layers from the bottom of respective outlets of a feedbox; said outlets being equal in number to the number of layers forming each said group multiplied by said given number; said push means, at each stop of said conveyor, simultaneously expelling respective layers from the outlets of said feedbox, and feeding said layers into respective said pockets; and further push means being provided for expelling respective groups, at each stop of said conveyor, from a number of pockets equal to said given number, and supplying said groups to an operating unit of said packing machine. The present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 shows a schematic view of a portion of a cigarette packing machine comprising a device for forming groups of cigarettes and implementing the method according to the present invention; Figure 2 shows a plan view of a number of details in Figure 1; Figure 3 shows a schematic view of a variation of the device in Figures 1 and 2. Figures 1 and 2 show a device for forming groups of cigarettes, and which constitutes the input portion 1 of a cigarette packing machine 2 with two wrapping lines 20'. Input portion 1 comprises an input feedbox 3, the bottom output end portion of which comprises six downward-tapering outlets 4, each divided internally by partitions or walls 5 into a number of channels 6. In the embodiment of feedbox 3 in Figures 1 and 2, channels 6 are seven in number for the two outlets 4 on the left and the two outlets 4 on the right, and are six in number for the two central outlets 4. As shown particularly in Figure 1, cigarettes 7 arranged in a column are fed by force of gravity and in a direction crosswise to their axes down each channel 6, and the bottom cigarette 7 in each column is deposited onto a plate 8 located beneath respective outlet 4 and at a distance from outlet 4 just slightly greater than the diameter of cigarettes 7. On plates 8, which are located beneath respective pairs of adjacent outlets 4 and at different levels increasing from left to right in Figure 1 by a height substantially equal to the diameter of a cigarette 7, there are formed, in the course of each operating cycle of device 1, respective side by side pairs of layers 9 of cigarettes (Figure 1) at a level just below the bottom end of respective outlets 4. To the side of plates 8 (Figure 2), there extends the top branch of a conveyor belt 10, which is driven in steps by a known drive element shown schematically by block 10', and is fitted with equally spaced pockets 11. Each pocket 11 extends crosswise to the traveling direction, indicated by arrow 12 in Figure 1, of the top branch of conveyor 10, and is positioned with its input end facing plates 8. At each step of conveyor belt 10, each pocket 11 is fed forward by a distance equal to twice the spacing between two consecutive pockets 11, so as to come to a stop in front of each plate 8 and successively receive three layers 9, which, as pockets 11 travel past feedbox 3, are superimposed one on top of the other inside pocket 11 to form a group 13 of cigarettes 7 constituting the content of a packet (not shown). At each stop of conveyor belt 10, each layer 9 is fed into respective pocket 11 by a pusher 14, which is connected integral with a cross member 15 moved back and forth by actuating means (not shown) in a horizontal direction perpendicular to direction 12, and is located, in a withdrawn idle position, on the opposite side of feedbox 3 to conveyor belt 10. Pusher 14 is movable between said withdrawn position and a forward position in which six push plates 14' of pusher 14 engage the space between the bottom ends of respective outlets 4 and respective underlying plates 8. In known manner (not shown), pusher 14 in the forward position is located with the free ends of push plates 14' contacting respective ends of layers 9 of cigarettes just fed into respective pockets 11. A pusher 16, connected integral with a cross member 17 moved back and forth by actuating means (not shown) in a horizontal direction perpendicular to direction 12, is located, in a withdrawn idle position, on the opposite side of feedbox 3 to conveyor belt 10. Pusher 16 is movable between said withdrawn position and a forward position in which, at each stop of conveyor belt 10, two push plates 16' and 16'' of pusher 16 axially engage the space inside two consecutive pockets 11 containing respective groups 13 of cigarettes and located at a portion of conveyor belt 10 downstream from feedbox 3 in direction 12. Preferably, said portion of conveyor belt 10 is curved, by comprising a portion of conveyor belt 10 looped about a transmission pulley 19. In actual use, when six successive pockets 11 of conveyor belt 10 are arrested in front of respective outlets 4, pusher 14 is operated by cross member 15 so that push plates 14' engage the space between respective outlets 4 and underlying plates 8, and push respective layers 9 into respective pockets 11. At the end of each operating cycle of pusher 14, the two pockets 11 at outlets 4 to the right in the drawings contain respective groups 13, which, in the course of successive steps of conveyor belt 10, are brought into the operating region of pusher 16. At each stop of conveyor belt 10, pusher 16 is operated to expel respective groups 13 of cigarettes 7, by means of respective push plates 16' and 16'', from the two pockets 11 facing it, and to feed said groups to an operating unit of packing machine 2, comprising, for example, a conveying or wrapping device shown schematically by block 20 and comprising said two wrapping lines 20'. Device 1 for forming and transferring groups 13 of cigarettes 7 therefore provides for fully achieving the object of the present invention, i.e. for enabling highly rapid operation, by individually forming and transferring, at each operating cycle of packing machine 2, the layers 9 eventually forming part of two groups 13, and by simultaneously transferring two groups 13 to unit 20. Device 1 for forming and transferring groups 13 of cigarettes 7 may be applied to packing machines featuring more than two wrapping lines by simply arranging matters so that outlets 4 of feedbox 3 are equal in number to the number of layers 9 in each group 13 multiplied by a whole number greater than one; that conveyor belt 10 is operated intermittently in steps of a length equal to the spacing between two consecutive pockets 11 multiplied by said whole number; that, at each stop of conveyor belt 10, respective layers 9 are expelled simultaneously from outlets 4 of feedbox 3 and fed into respective pockets 11; and that, at each stop of conveyor belt 10, respective groups 13 are expelled from a number of pockets 11 equal to said whole number, and supplied to said operating unit 20 of packing machine 2. Conveyor belt 10 may also be powered to operate in steps of a length equal to the spacing between two consecutive pockets 11, in which case, pushers 14 and 16 are operated at alternate stops of conveyor belt 10. Figure 3 shows a device 1' by way of a variation of device 1, and the component parts of which are indicated, wherever possible, using the same numbering system as for the corresponding parts described in connection with Figures 1 and 2. In device 1', conveyor belt 10 is fitted with a number of equally spaced pockets 11, preferably with as small a spacing as possible; the six outlets 4 of feedbox 3 are divided into two identical groups 21, each comprising three side by side outlets 4 parallel to direction 12; when conveyor belt 10 is arrested, and in the same way as described with reference to Figures 1 and 2, the bottom output ends of outlets 4 of each group 21 are positioned facing respective nonconsecutive pockets 11 alternating in pairs with a further pocket 11; and, again when conveyor belt 10 is arrested, the two sets of five pockets 11 facing respective groups 21 of outlets 4 are separated by a pair of consecutive pockets 11. As described with reference to device 1, the bottom cigarette 7 in the column in each channel 6 is deposited onto a plate 8 located beneath respective outlet 4 and at a distance from outlet 4 slightly greater than the diameter of cigarettes 7. On plates 8, which, within each group 21 of outlets 4, are located at different levels increasing from left to right in Figure 3 by a height substantially equal to the diameter of cigarette 7, respective layers 9 of cigarettes are formed, as already described, in the course of each operating cycle of device 1'. Push plates 14' of pusher 14 of device 1' are so located (not shown) as to engage, as already described, the space between the bottom ends of respective outlets 4 and respective underlying plates 8. In actual use, at each step of conveyor belt 10, each pocket 11 is fed forward by a distance equal to twice the spacing between two consecutive pockets 11; and, whenever six pockets 11 of conveyor belt 10 are arrested in front of respective outlets 4, pusher 14 is operated by cross member 15 so that push plates 14' engage the space between respective outlets 4 and underlying plates 8, and push respective layers 9 into respective pockets 11 as described previously. At the end of each operating cycle of pusher 14, and as a consequence of the arrangement of the two groups 21 of outlets 4 and plates 8, the three pockets 11 at outlets 4 in each group 21 respectively contain, from left to right in Figure 3, one, two and three layers 9 of cigarettes 7; and the three pockets 11 immediately downstream, in the traveling direction of conveyor belt 10, from those just fed with a layer 9 of cigarettes 7 from the outlets 4 forming part of group 21 to the left in Figure 3 are empty, and are successively fed past the outlets 4 forming part of group 21 to the right, so as to also receive respective layers 9 of cigarettes 7. In exactly the same way as described with reference to Figures 1 and 2, therefore, respective groups 13 are formed inside two pockets 11 at each operating cycle of device 1'; and, in the course of successive steps of conveyor belt 10, the pockets 11 containing respective groups 13 are brought in pairs within the operating region of pusher 16, which, at each operating cycle of device 1', feeds two groups 13 to said operating unit 20 as already described. The above design of device 1' provides for closely spacing the pockets 11 of conveyor belt 10, which may therefore be operated in very small steps to minimize the acceleration and inertia to which it is subjected.

Claims: A method of forming and transferring groups of cigarettes on a multiple-line packing machine with a given number of wrapping lines; each said group (13) being fed into a respective pocket (11) of a conveyor (10), which is moved intermittently in steps of a length equal to the spacing between two consecutive said pockets (11) multiplied by said given number; characterized in that each said group (13) comprises a number of superimposed layers (9) fed successively into the respective said pocket (11) by push means (14) for successively expelling the layers (9) from the bottom of respective outlets (4) of a feedbox (3); said outlets (4) being equal in number to the number of layers (9) forming each said group (13) multiplied by said given number; respective layers (9) being expelled simultaneously from the outlets (4) of said feedbox (3) and fed into respective said pockets (11) at each stop of said conveyor (10); and, at each stop of said conveyor (10), respective groups (13) being expelled from a number of pockets (11) equal to said given number, and supplied to an operating unit (20) of said packing machine (2). A method as claimed in Claim 1, characterized in that said given number is two. A method as claimed in Claim 1 or 2, characterized in that said groups (13) are expelled from said pockets (11) at a curved portion of said conveyor (10). A method as claimed in any one of the foregoing Claims, characterized in that the spacing between the outlets (4) of said feedbox (3) equals the spacing between said pockets (11) of said intermittent conveyor (10). A method as claimed in any one of the foregoing Claims from 1 to 3, characterized in that the outlets (4) of said feedbox are divided into a number of sets (21) equal to said given number; the spacing between the outlets (4) in each said set (21) being equal to the spacing between said pockets (11) multiplied by said given number; and, when said intermittent conveyor (10) is stopped, each pair of said sets (21) being separated by a number of pockets (11) equal to said given number. A device for forming and transferring groups of cigarettes on a multiple-line packing machine with a given number of wrapping lines; the device comprising a conveyor (10) having a plurality of pockets (11), in each of which a respective said group (13) is fed; and drive means (10') for moving said conveyor (10) intermittently in steps of a length equal to the spacing between two consecutive said pockets (11) multiplied by said given number; characterized by comprising push means (14) to feed successively a number of superimposed layers (9) into the respective said pocket (11) for successively expelling the layers (9) from the bottom of respective outlets (4) of a feedbox (3); said outlets (4) being equal in number to the number of layers (9) forming each said group (13) multiplied by said given number; said push means (14), at each stop of said conveyor (10), simultaneously expelling respective layers (9) from the outlets (4) of said feedbox (3), and feeding said layers (9) into respective said pockets (11); and further push means (16) being provided for expelling respective groups (13), at each stop of said conveyor (10), from a number of pockets (11) equal to said given number, and supplying said groups (13) to an operating unit (20) of said packing machine (2). A device as claimed in Claim 6, characterized in that said given number is two. A device as claimed in Claim 6 or 7, characterized in that said further push means (16) operate at a curved portion of said conveyor (10). A device as claimed in any one of the foregoing Claims from 6 to 8, characterized in that the spacing between the outlets (4) of said feedbox (3) equals the spacing between said pockets (11) of said intermittent conveyor (10). A device as claimed in any one of the foregoing Claims from 6 to 8, characterized in that the outlets (4) of said feedbox are divided into a number of sets (21) equal to said given number; the spacing between the outlets (4) in each said set (21) being equal to the spacing between said pockets (11) multiplied by said given number; and, when said intermittent conveyor (10) is stopped, each pair of said sets (21) being separated by a number of pockets (11) equal to said given number.

Inventors: DRAGHETTI FIORENZO, DRAGHETTI, FIORENZO
Applicants: GD SPA, G.D SOCIETA' PER AZIONI
Application year: 1996
Main classification: B65B19
IPC codes: B65B19