US 20060169295 A1
Filter tips are applied to cigarettes by a device equipped with a conveying roller (9) on which assemblies (4) composed of two cigarettes (5) and a double length filter plug (6) placed between them are united with tipping papers (11), also with a flexible rolling conveyor (12) looped around first and second pulleys (16, 18) and combining with the roller (9) to create a concave channel (13) along which a tipping paper is rolled around the relative filter. The rolling surface of the flexible conveyor (12) is faced with metal cleats (24) ordered transversely one beside the next. To ensure that the conveyor (12) runs concentrically with the roller (9) and maintain a constant depth along the channel (13), the device is equipped with magnets (30) and guide wheels (33) positioned on the side of the flexible conveyor (12) opposite from the channel (13) in such a way that the magnets (30) will interact with the cleats (24) and with blocks (26) and screws (27) by which the cleats are clamped to the conveyor (12).
1. A device for applying filters to cigarettes, comprising a first conveyor (8) serving to carry assemblies (4) composed of at least one cigarette (5) and a filter plug (6) placed end to end, and tipping papers (11) by which the assemblies (4) are joined permanently, also a rolling channel (13) of depth matched approximately to the diameter of the assemblies (4) received from the first conveyor (8), characterized in that the rolling channel (13) comprises a flexible rolling conveyor (12) at least on the one hand, looped around first and second transmission means (14, 15), and in that the rolling surface of the flexible conveyor (12) is furnished with a plurality of rigid elements (23).
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The present invention relates to a device for applying filters to cigarettes, and in particular to a device by which cigarettes and filters are joined together with gummed tipping papers.
Conventionally, filters are applied to cigarettes by machines referred to as filter tip attachments, in a succession of steps briefly described below.
Cigarettes are ordered in pairs, with the two cigarettes of each pair axially aligned and a filter plug double the length of a tip for one cigarette interposed between them in end-to-end contact, likewise axially aligned. The group or assembly made up of the single cigarettes and the filter plug is joined permanently by means of a gummed tipping paper wrapped around the filter plug and overlapping each of the corresponding cigarette ends by about three millimetres.
According to prior art practice, these assembling and joining steps can be brought about on the surface of a conveying drum, onto which the aforementioned assemblies and the gummed papers are directed, in an operation whereby each assembly is rolled against a relative paper. The rolling action is induced along a passage delimited on the one hand by the drum and on the other by a fixed plate of arched profile that combines with the outer surface of the drum to create a rolling channel.
It happens with this type of method that when given operating speeds are exceeded by the filter tip attachment, cigarettes entering the rolling channel at an angular velocity of zero, referred to their own axes, are accelerated to a relatively high speed of rotation and subjected consequently to high stresses tending to spoil the cigarettes irreparably, with the loss of tobacco particles from their ends.
Employing a different method also embraced by the prior art, the rolling channel is created between the drum on the one hand, and on the other, a belt driven at a speed different to that of the drum and embodied usually in a flexible and resilient material. In this instance, however, the belt material tends to wear rapidly.
The object of the present invention is to provide a device for applying filters to cigarettes that will be unaffected by the drawbacks typical of prior art devices as described above.
The stated object is realized in a device according to the present invention for applying filters to cigarettes, of which the characterizing features are recited in claim 1 appended.
The invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which:
Positioned in close proximity to the roller 9, downstream of the transfer station 7, is a flexible rolling conveyor 12 that combines with the outer cylindrical surface of the roller 9 to establish a rolling channel 13. The flexible rolling conveyor 12 is looped around first and second transmission means denoted 14 and 15 of which the first, upstream, comprises a first freely revolving return pulley 16 combining with the flexible conveyor 12 by which it is partly enveloped to create an infeed conveyor 17 preceding the rolling channel 13, whilst the second, downstream, comprises a second power driven return pulley 18 and, rigidly and concentrically associated with the pulley, a take-up roller 19 of which the periphery affords a plurality of recesses 20 placed to receive the assemblies 4 emerging from the rolling channel 13, each with a tipping paper 11 wrapped around the double filter plug 6 and the cigarettes 5 and denoted 4 a. The pulley 18 and roller 19 thus constitute an outfeed and take-up conveyor 21.
In operation, the peripheral speed of the conveying roller 9 is greater than the speed of the flexible conveyor 12 along the channel 13, thereby inducing the rolling action.
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As discernible from the drawings, the outside face of the flexible conveyor 12, which can be fashioned as a web or belt of resilient and flexible material, is furnished with a plurality of rigid cladding elements 23 consisting, as illustrated in
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The function of the magnetic elements 30 is to interact with the cleats 24 and with the fastening means 25 and thereby attract the flexible conveyor 12 along the length of the rolling channel 13 in such a way as to maintain the correct position of the conveyor 12 relative to the conveying roller 9, as described above.
The guiding and locating means 29 comprise a plurality of freely revolving wheels 33 rotatable about axes parallel to the axis of the conveying roller 9 and offered in contact to the inside face of the flexible conveyor 12.
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In addition, every second cleat 24 of the rolling surface, in the example illustrated, is furnished along the edge located downstream in the direction followed by the conveyor 12 along the channel 13, with a rib or lip 39 of which the function is to interact positively with each assembly 4 directed into the rolling channel 13 so as to initiate the rolling step brought about along the channel 13.
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Moreover, and with protection likewise in mind, the device 2 according to the invention is equipped with two guards 41, one only of which visible in
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