Textiles: fiber preparation – Working – Carding
Patent
1991-10-07
1993-03-30
Falik, Andrew M.
Textiles: fiber preparation
Working
Carding
406 70, 406106, 406171, D01G 1540, D01G 2302
Patent
active
051971623
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for feeding flocculent fiber material to processing machines.
Such feeding devices are used for example with carding machines, but also with opening and cleaning machines.
2. Description of the Related Art
A known device for feeding machines that process fiber material, e.g. carding machines, beating machines or the like, is disclosed for example in German Laid Open 36 25 311. The feeding device has an upper filling chute with perforated walls from which the flow of transport air may be discharged. A feeding roller cooperating with a beater or an opening roller is arranged at the lower end of the filling chute. Tangentially from the beater roller, a feeding chute also having partly perforated chute walls leads to a pair feed rollers supplying the fiber mat to the next processing machine. Tangential to the beater roll, but behind the beating point, a compacting air flow is blown into the chute that escapes at the perforated chute walls of the feeding chute and is supplied to a fan for recirculation.
The flow of transport air escaping at the upper feeding chute is discharged via a separate exhaust conduit. A such feeding device only allows to compact the fibers in the feeding chute, but does not contribute to a reduction of the dust accompanying cotton fiber flocks.
It is the object of the invention to improve the feeding device of the type initially mentioned such that the amount of dust in the fiber flocks is reduced.
SUMMARY OF THE INVENTION
The flow of transport air is advantageously discharged within the housing in an exhaust chute that is substantially parallel to the filling and feeding chute to an exhaust air connecting member at the lower end of the machine. This exhaust air connecting member is arranged downstream of the air-permeable chute wall of the feeding chute and is thus able to additionally discharge the flow of compacting air separated from the fibers, which is particularly rich in dust and foreign particles after the beating point between the feeding and the beater roller. A part of the transport air flow discharged from the filling chute is used as the flow of compacting air, the branching point being arranged downstream of the air-permeable chute wall of the filling chute, but before the air-permeable chute wall of the feeding chute. In this way, it is guaranteed that only the flow of transport air separated in the filling chute is used as the flow of compacting air.
The entire flow of exhaust air may be connected with an exhaust air outlet of e.g. the next machine via the exhaust air connecting member arranged in the lower portion of the machine.
Preferably, the branched part of the air flow is directed to the nip between the feeding and the beater rollers in a tangential direction with respect to the beater roller, whereby, advantageously, the branched part of the air flow is not only used as the compacting air flow, but the blowing effect thereof also supports the loosening of dust and foreign particles from the fiber flocks at the beating point in the nip. The compacting air flow enriched by waste and dust particles is not recirculated, but discharged directly via the exhaust chute.
The partial air flow may alternately be shut-off or released, thereby causing a pump effect in the feeding chute that permits a self-cleaning effect at the air-permeable chute wall of the feeding chute, thus preventing a clogging of the air-permeable chute wall, e.g. a sieve wall, and allowing an unobstructed continuous operation.
Downstream of the air-permeable chute wall of the filling chute, the exhaust air chute may be adapted to be at least partially shut off intermittently. In this way one may also obtain a self-cleaning effect at the air-permeable chute wall in the filling chute. The shut-off operation may be effected by means of slides or flaps that may also be subdivided over the width of the chute and may be operated alternately.
DESCRIPTION OF THE DRAWINGS
The construction designed to carry out the i
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Lucassen Guenter
Pinto Akiva
Falik Andrew M.
Flint Cort
Hergeth Hollingsworth GmbH
Izaguirre Ismael
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