EP0546644A1

EP0546644A1 - Suction system for textile machinery and in particular for a ring spinning machine

Info

Publication number: EP0546644A1
Application number: EP92203877A
Authority: EP
Inventors: Alessandro Mirri; Vittorio Vernocchi
Original assignee: Savio SpA; Savio Macchine Tessili SpA
Current assignee: Savio SpA; Savio Macchine Tessili SpA
Priority date: 1991-12-13
Filing date: 1992-12-11
Publication date: 1993-06-16
Also published as: IT1252210B; ITMI913351A1; ITMI913351A0

Abstract

A suction system for textile machinery and in particular for a ring spinning machine, comprising two manifold channels (2,4) which extend along the entire spinning face one above the other, the underlying manifold channel (4) comprising a suction column (3) which connects it along the entire length of the spinning machine to floor ducting (6), said suction column (3) being put under vacuum by at least one motor-driven axial suction fan (1) positioned in its end part in proximity to a coaxial converging mouth between the column (3) and the ducting (6), to achieve the effect of an ejector which strongly draws in air through lateral apertures also of substantially converging form.

Description

This invention relates to a suction system arranged to remove trash, fibre fluff and broken threads along the spinning faces of ring spinning machines which produce yarn to be deposited on rod-shaped tubes to obtain wound yarn packages.
Said ring spinning machines normally comprise a plurality of working positions on two opposing faces, and are therefore very long.
Textile machines comprise suction ducts for the most varied purposes, for example to clean determined parts of the machine, to remove fibre trash and to draw off excessive yarn ends or pieces of cut yarn or the like. It is well known that in drafting systems of spinning machines, a fibre bundle consisting of an assembly of fibres of varying lengths is subjected to considerable traction stresses resulting in separation of a certain quantity of in particular short fibres and the formation of trash. It is therefore necessary to clean the drafting members and remove the flying fibrillae and fibres and the trash from the various machine parts and from the yarn under formation. It is also necessary to draw off and remove any pieces of broken yarn.
In this case the suction action has to be effective and uniform along the entire spinning face. In addition, the spinning faces of ring spinning machines are of considerable horizontal extension of some tens of metres, as the spinning spindles can be present in a quantity of the order of a thousand, one following the other.
The cross-sectional area of the air suction duct and the power of the Pneumatic system therefore become relatively large, with consequent high system and operating costs. In addition, because of the considerable length of ring spinning machines, the continuous draw-off of trash, fibres and broken threads in known systems is insufficient in those regions farthest from the motor-driven suction fan or other type of suction device which provides the suction action. The air throughput in a central suction system, in which a suction duct extends along the entire spinning face to serve all the spinning spindles via suction nozzles or slits, is represented by the total air quantity necessary in order to achieve an energetic suction action at the spinning spindles.
To achieve good draw-off of broken threads and filament particles and good conveying thereof into the collection bin at the machine headstock where the suction fan and filter elements are situated, the air speed within the ducts and through the suction slits must be sufficiently high, and the vacuum level produced must take account of the continuous and local pressure drops.
Problems occur in known constructions, such as the retention of a certain number of broken fibres and threads in the suction tubes acting on the spinning spindles in those regions farthest from the fan in the machine headstock.
Fibres, dust and broken threads which have not been properly drawn off from the suction tubes often trigger their clogging, so blocking the suction action required for continuous cleaning of the spindles, which are hence subjected to progressive deposition of fibre trash on their various parts and on the yarn under formation. This results in yarn irregularities and defects which reduce its quality, such irregularities leading in the limit to yarn breakage during the formation stage or during subsequent yarn processing stages. The causes of this are the presence of a single suction duct from which all the suction tubes extend, of which there are more than one for each spinning spindle, and also the presence of a single motor-driven suction fan located at the headstock of the spinning machine. The fact of there being only one suction duct and only one suction fan means that a substantially uniform suction cannot be ensured along the entire spinning face, with the result that they are unable to effectively remove the fibrils and dust which deposit on the various spinning machine members, so compromising uniform spinning.
Secondly, the slits in the suction tubes, which are of small cross-section, are easily and frequently clogged because the suction action is weak, so that the suction effectiveness falls off considerably after a few hours of working, making frequent maintenance and cleaning of the suction slits necessary.
This maintenance and cleaning of the suction slits requires considerable attention by the service personnel, who are required to work without any established timetable. It is understandable that work carried out on a selective or random basis without an established timetable leads to low labour efficiency.
An object of the present invention is to provide a suction system for removing fibre trash and broken fibre pieces in spinning machines which is free of the aforesaid drawbacks and is able to perform its function with greater effectiveness and for a longer time, without requiring frequent maintenance.
A further object of the present invention is to rationalize the construction of the suction system of a ring spinning machine, both in terms of its capacity and of its suction efficiency in effectively removing fibrils and floating yarn pieces from the suction spindles.
A further object of the present invention is to provide a pneumatic suction system of new while at the same time simple concept, which makes it possible to put under suction several regions which integrate and complete the entire suction operation with further functions required for the particular application underway.
These and further objects of the invention, which will be more apparent during the course of the description, are attained by the suction system of the present invention arranged on a spinning machine of considerable longitudinal extension, in particular a ring spinning machine, wherein said suction system comprises two manifold channels which extend along the entire spinning face one above the other, the manifold channel in the lower position comprising a suction column which connects it, along the entire length of the spinning machine, to floor ducting and which is put under vacuum by at least one motor-driven axial suction fan positioned in the end part in proximity to where the converging mouth of the column enters the ducting, said connection mouth comprising considerable lateral apertures.
The said converging mouth between the column and the ducting is coaxial and central so as to comprise substantially equal lateral apertures, said converging mouth acting as an ejector to energetically draw through the apertures the surrounding air below the spinning machine, and also to convey the air blown by the mobile blower which moves along the machine to be cleaned.
The said lateral apertures are substantially shaped to converge both along the entry portion and frontally at the end part of the mouth between the column and the ducting.
One embodiment of the invention is described in detail and further clarified hereinafter by way of non-limiting example with reference to the figure of the accompanying drawing.
The figure of the single accompanying drawing shows a schematic front sectional view of the suction system of the invention, the sectional view showing the upper manifold channel operating on the drafting roller and the lower manifold channel operating on the spinning spindles, the figure also schematically showing the suction column of the lower manifold channel, which opens into the factory floor ducting, with the presence of an axial suction flow.
The various units and the equipment which operate in forming the yarn in the ring spinning machine, into which the suction system of the present invention is incorporated, are neither illustrated nor is their operation described, as they are already known and do not concern the operation of the present invention.
In the accompanying drawing:

1 - schematically represents an axial motor-driven suction fan positioned in the end part of the suction column 3 in proximity to the converging mouth between the column 3 and the floor ducting 6. Said suction fan is driven by an electric motor inserted simply into its central hub, as is well known in the state of the art;
2 - is the upper manifold channel which operates in cleaning the drafting roller;
3 - is the suction column which connects the lower manifold channel 4 to the floor ducting 6 along the entire length of the spinning machine 10, said column 3 being put under vacuum by the axial suction fan 1;
5 - is the vertical tubular element of the known mobile blower, which moves continuously to and fro along the spinning face, against which air blown through the projections 7 is fed;
9 - is the flexible and extendable suction hose connected to the channel 4, said suction hose 9 sucking in proximity to the spinning spindle 11 and being advantageously fixed to the ring bench 12 so that its suction slit 8 rigidly follows the continuous reciprocating upwards and downwards movement of the ring bench 12;
14 - is one of the suction tubes connected to the manifold channel 2, said tube 14 operating in cleaning the drafting roller 15.

The operation of the suction system of the present invention shown in the figure of the accompanying drawing is easily deduced.
In the machine headstock, ie at the end of the spinning machine, there is a suction fan which puts the manifold channel 2 under vacuum. The fibre trash and the dust present around the drafting unit 15 are drawn off by the slit in the tube 14 and conveyed into the manifold channel 2 which conveys them within its air stream to the end of the spinning machine 10 where they are retained by filtering surfaces, as is well known. Simultaneously during the spinning process, the fibre trash, dust and broken yarn pieces present in proximity to the spinning spindle 11 are drawn off through the suction mouths 8 of the hoses 9 and conveyed into the air stream of the suction column 3, put under vacuum by the action of the axial suction fan 1, to be fed into the factory suction ducting system 6. Said forced air stream deriving from the fan 1 leads to a considerable draw-in of the surrounding air below the spinning machine, and also energetically draws in the air blown by the projections 7 of the mobile blower, to achieve an optimum result in cleaning the entire spinning machine in that the trash and dust are removed with the greatest possible care and rapidity during the spinning process. The result is a better environment for the service personnel, a better product yarn quality and improved cleaning of the machinery, which no longer requires frequent and costly maintenance.
Modifications in terms of detail can be made to the suction system of the present invention, but without leaving the scope of the invention.

Claims

1. A suction system for textile machinery and in particular for a ring spinning machine, comprising two manifold channels which extend along the entire spinning face one above the other, the manifold channel in the upper position operating in cleaning the drafting roller and the lower manifold channel operating in cleaning in correspondence with the spinning spindle, said suction system being characterised by comprising a suction column which connects the spindle-sucking lower manifold channel, along the entire length of the spinning machine, to floor ducting, said suction column being put under vacuum by at least one motor-driven axial suction fan positioned in its end part in proximity to where the converging mouth of the column enters the ducting, at which considerable lateral apertures are present.

2. A suction system as claimed in claim 1, characterised in that the converging mouth between the column and the ducting is coaxial and central so as to comprise substantially equal lateral apertures, said converging mouth acting as an ejector to energetically draw through the apertures the surrounding air below the spinning machine, and also to convey the air blown by the mobile blower which moves along the machine to be cleaned.

3. A suction system as claimed in claim 2, characterised in that said lateral apertures are substantially shaped to converge both along the entry portion and frontally at the end part of the mouth between the column and the ducting.