Multiple-card or so-called tandem-card with transferring, carding and cleaning cylinder

Abstract: A multiple-card, so-called "tandem card" compris­ ing, between the combing cylinder (doffer) (5) of the first carding drum (3) and the second carding drum (7), transfer means made up of doffing, carding and cleaning members (14, 14A, 14B, 14C) which also ar­ range the fibres parallel to each other.

Description: The invention relates to an improvement in a multiple-card, so-called "tandem card", comprising a first carding drum and a second cascade-arranged carding drum, a first combing cylinder (doffer) for the first carding drum, a second combing cylinder for the second carding drum, and transfer means between said first combing cylinder and said second carding drum; said transfer means generally consist of at least one cylinder with clothing having the functions of carding and arranging in parallel the fibres, and said at least one cylinder with clothing is disposed below or almost at the level of the first combing cylinder and of the second carding drum. A known card of the above type is disclosed for example in FR-A-1.317.189. All the present-day existing multiple-cards, called "tandem cards", are provided with a cylinder which is exclusively of transfer type and is intended for the transfer of the fibres from the doffer or comber of the first card to the drum of the second card. For the transfer of said fibres a second cylinder may also be provided, according to the running motion of the doffer. In any case, said members, being merely transfer means, have no carding member to arrange the fibres in parallel during the motion. According to the invention, on the contrary, cleaning blades and caps (or flats) associated therewith are disposed in the lower zone of said cylinder with clothing having the functions of carding and arranging the fibres in parallel, in order to obtain the cleaning by gravity and suction from below, besides by the centrifugal effect. The invention - as above defined - provides the transfer means - according to the motion of the doffer - with the possibility of being combined with carding and cleaning members, allowing said transfer means to become in practice a third carding drum. This permits the fibres to be perfectly thinned while arranging them parallel to each other during the transfer step from the doffer of the first carding drum to the second carding drum, and also permits the cleaning of the material fed to the drum of the next card. During the transfer of the fibres, disposed perfectly parallel to each other and perfectly thinned, cleaning blades are in fact also provided which are interposed between the carding members; such blades, suitably registered and properly spaced apart and being inserted below the carding member which transfers the fibres, clean same fibres by moving away foreign particles, including the so-called cotton "shells", by centrifugal and gravity effect. All these impurities or particles fall directly, with no provision for other members, onto the underlying suction zone of the card. In the prior art document FR-A-1.317.189 the transfer means comprise members which are just doffing and carding means, but they are not cleaning means. In fact, around the second carding and transfer cylinder no cleaning means are provided, like the cleaning blades and the caps or flats of the invention, which clean the fibres. In the above French document, the cleaning is achieved by well known members which work on the second big drum; these members in the French document are complex and work with difficulty because the effect of gravity tends to maintain the particles or to let them fall on the clothing of the big drum. According to the invention, on the contrary, the removed particles are moved away by gravity and fall downwards. Also in the prior art document EP-A-0 188 177 only transfer cylinders are provided which may have some kind of carding effect, but no removal operation of particles is carried out. In prior art document GB-A-971830 a suction system is suggested, which is able only to remove the dust from the big drum, from a final worker and from the doffer, but no members are provided which remove particles from the fibres. This document provides knives which operate on a cylinder situated upstream of the big drum; therefore, these knives only serve the purpose of removing very heavy particles - for example metallic particles - from the material before it is carded. The pneumatic system of said document only removes dust, or also the fibres, when the fibres are short fibres, but not the impurities, which instead are efficaciously removed by the caps and by the cleaning blades of the invention, and not efficaciously removed by the complex members 14 and 27 of document FR-A-1.317.189. According to an advantageous embodiment, in the multiple-card according to the invention - in the presence of said cylinder with clothing equipped with cleaning blades - the second carding drum has fixed caps instead of rotating ones to be cleaned. These fixed caps are much simpler than the mobile caps of document FR-A-1.317.189, and they may be adopted just in consideration of the presence of the cleaning members on the transfer cylinder that precedes the second big drum. The transferred, parallel and clean fibres, with the improvement according to the invention and driven into the drum of the traditional second card, allow the machine to increase its output, to improve the quality of the ribbon and, consequently, of the finished product, to the point - if wanted - that the usual rotating caps or cleaning means of the present-day cards are no longer necessary for the cleaning of the fibres. The invention will be better understood by following the description and the attached drawing, which shows a practical non-limitative exemplification of same invention. The drawing shows a schematic side view of the "tandem card" according to the invention. According to what is illustrated in the attached drawing, numeral 1 generally indicates a group for feeding of the material to be worked, said material being fed to a first carding drum 3 of a type known per se. With said carding drum 3, a doffer or combing cylinder 5 cooperates, capable of doffing the material out of the clothing of the carding drum 3 in order to feed it to the second carding drum 7 through a transfer means. The material is doffed from the second carding drum by a comber 9, from which the same material is discharged by means of a comb 10 of traditional type. Each of the two drums 3 and 7 will be equipped with an assembly of peripheral working and cleaning units like the so-called "caps" or with a set of working and doffing cylinders. According to the invention, a doffing, carding and cleaning member 14 is provided as a transfer means between the doffer 5 and the drum 7, which is also able to arrange the fibres parallel to each other. Practically, a cylinder 14A with clothings may be provided, being combined in its lower part with caps 14B and cleaning blades 14C. The thus realized group 14 ensures the cleaning of the material fed thereto by the doffer 5, allows the doffing and carding of the fibres and also ensures the parallel arrangement of same fibres, that is, a kind of combing of the fibres. The impurities and the foreign particles separated by the members 14B, 14C are removed both by centrifugal effect and gravity, their detachment and removal being facilitated by the suction effect in the lower part of the carding group, as provided by solutions already suggested by the same applicant. In particular, a transverse suction slot 16 is provided at the centre of a casing 18 with apertures 20 for the air admission. The arrows indicate the rotation direction of the individual cylinders, and the speeds are such as to consent the discharge of drum 3 by the cylinder 5, of the cylinder 5 - directly or indirectly - by the cylinder 14A, and the transfer of the material from cylinder 14A to the drum 7. The comber 9 doffs the drum 7 and yields, in turn, the web to comb 10. The cylinder 5 may also rotate in the direction opposite to that indicated in the drawing. An example of embodiment may provide peripheral, that is, surface speeds of the following values: about 1800 m per minute for drums 3 and 7; about 200 m per minute for combers 5 and 9; about 800-1000 m per minute for cylinder 14A. The group 14, 14A, 14B, 14C is able to clean the fibres to such a degree that the second carding drum 7 need no longer be provided with rotating caps, that is, of the type permitting the cyclic cleaning of their own operating members; therefore, said second carding drum 7 may be equipped with the simplest fixed carding caps 7A. The clothing of said second carding drum 7 has a far longer life than that of the traditional cards, because it receives fibres from the group 14, 14A, 14B, 14C, already devoid of impurities and clots. It is understood that the drawing shows an exemplification given only as a practical demonstration of the invention, as this may vary in forms and dispositions without nevertheless departing from the scope of the concept on which the same invention is based. Transfer members may be provided, for example, between the doffer 5 and cylinder 14A and between the latter and drum 7, and two or more groups 14 in series may possibly be provided as well.

Claims: A multiple-card, so-called "tandem card", comprising a first carding drum (3) and a second cascade-arranged carding drum (7), a first combing cylinder (doffer) (5) for the first carding drum (3), a second combing cylinder (9) for the second carding drum (7), and transfer means (14) between said first combing cylinder (5) and said second carding drum (7), said transfer means (14) consisting of at least one cylinder with clothing (14A) having the functions of carding and arranging in parallel the fibres, said at least one cylinder with clothing (14A) being disposed below or almost at the level of the first combing cylinder (5) and of the second carding drum (7), characterized in that cleaning blades (14C) and caps (or flats) (14B) associated therewith are disposed in the lower zone of said cylinder, in order to obtain the cleaning by gravity and suction from below, besides by the centrifugal effect. Multiple-card according to claim 1, characterized in that - in the presence of said cylinder with clothing (14A) equipped with cleaning blades - the second carding drum has fixed caps (7A) instead of rotating ones to be cleaned.

Inventors: GIULIANI MARCELLO, GIULIANI, MARCELLO
Applicants: GIULIANI MARCELLO, GIULIANI, MARCELLO
Application year: 1987
Main classification: D01G15
IPC codes: D01G15