Title of Invention

ROTOR SPINNING MACHINE

Abstract

The invention relates to a rotor spinning machine comprising a plurality of working stations and a bobbin supplying device extending along the machine. At least two service units supplying the working stations with bobbins are supplied with bobbins by the supply device. A control device (14) for controlling the service units (5, SA, SB, SC) is embodied in such a way that it prevents a subsequent request for bobbins from the second service unit (5A) during a request for bobbins from the first service unit (5) positioned downstream in relation to the transport direction of the supply device, until the previous bobbin request has been fulfilled. In this way, unnecessary downtime of the working stations and unnecessary waiting time for the service units (5, 5A, 5B, SC) is avoided.

Full Text

THE PATENT ACT 197° (39 of 1970) & The Patents Rules, 2003 COMPLETE SPECIFICATION (See Section 10, and rule 13 1. TITLE OF INVENTION ROTOR SPINNING MACHINE 2. APPLICANT (S) a) Name b) Nationality c) Address SAURER GMBH & CO., KG GERMAN Company LANDGRAFENSTRASSE 45, 41069, MONCHENGLADBACH, GERMANY 3. PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it i0 to be performed : - Description Rotor spinning machine The invention relates to a rotor spinning machine. Service units are used on rotor spinning machines and can be moved on guide rails on the longitudinal sides of the rotor spinning machine. Starting spinning after a thread break and supplying the spinning stations of the rotor spinning machine with bobbins belongs to the tasks of the service devices. In order to keep the stoppage times of the spinning stations as short as possible in the event of a thread break or bobbin change, a plurality of service units are used on a rotor spinning machine, for example two service units on each longitudinal side of the machine. DE 42 17 575 A discloses a winding machine with a number of winding stations arranged next to one another. At least one take-up bobbin changing device can move along the winding stations. A bobbin supply mechanism is arranged at one end of the winding machine. A conveying device for supplying the bobbins from the bobbin supply mechanism is arranged parallel to the travel path of the take-up bobbin changing device. A bobbin holding device for receiving the bobbins brought by the conveying device is provided at the take-up bobbin changing device. The bobbin holding device configured as a bobbin store is an additional constructional outlay on the take-up bobbin changing device. If a winding station has been stopped owing to a full take-up bobbin, the take-up bobbin changing device is moved into a position in front of this winding station. The full take-up bobbin is exchanged for an empty bobbin. The new bobbin is removed for this purpose from the bobbin store brought by the take-up bobbin changing device. After the bobbin change, the supply bobbin changing device waits at the winding station, until a bobbin brought by the 2 conveying device has filled up its store again. The supply bobbin changing device then travels to a further winding station, which requests a supply bobbin change. DE 199 05 856 Al describes a rotor spinning machine/ which, between end frames, has a plurality of working stations, which are arranged on the two longitudinal sides of the machine. These working stations each have # spinning mechanism and a downstream winding mechanism and are supplied by a plurality of service units during operation. A service unit is requested and positioned at the working station for a bobbin change at a working station. From the bobbin magazine, a bobbin is requested, which is transported by means of a transport band to the working station. The service unit has a device, with which the bobbin delivered can be removed from the transport band. The bobbin is then positioned in the winding station in the operating position. When the service unit operating further away from the bobbin magazine requests a bobbin first and, before the bobbin has arrived at this first service unit, the second service unit positioned closer to the bobbin magazine also requests a bobbin, it may occur that the bobbin intended for the first service unit is removed from the conveyor belt by the second service unit. Delays occur as a result, which can lead to undesired long stoppages of working stations. The object of the invention is to avoid undesired removals oi this type of bobbins from the conveyor belt. This object is achieved according to the invention by a rotor spinning machine. Advantageous configurations of the invention are the subject of the sub-claims. 3 The control device of the rotor spinning machine is configured according to the invention in such a way that it suppresses a subsequent bobbin request from the second service unit in the event of an existing bobbin request from the first service unit positioned downstream in relation to the transporting direction of the supply device, until the initially existing bobbin request has been fulfilled. As a result, undesired removals of bobbins from the conveyor belt by the service unit requesting a bobbin secondly, are avoided. The service unit initially requesting a bobbin is not prevented by too long a service stop at a working station from rapidly fulfilling optionally existing requests from further working stations. With a rotor spinning machine according to claim 2 or 3, the time in which the subsequent bobbin request from the second service unit is suppressed, is kept as short as possible. Expediently, the control device is a central machine control device, to keep the outlay for control as low as possible. With the rotor spinning machine according to the invention, undesired removals of bobbins from the transport belt are prevented. By the avoidance of unnecessary stoppage times, the productivity of the machine is improved. Further details of the invention emerge from the figures. In the drawings: Fig. 1 shows a rotor spinning machine with service units. Fig. 2 shows a simplified schematic view of the control of the service units. The rotor spinning machine 1 shown in Fig. 1 has, between its end positions 2 and 3, a plurality of working stations 4, which are arranged on the two longitudinal sides of the machine. The working stations 4, which in each case comprise a spinning mechanism and a winding mechanism, are supplied by four service units 5, 5A, 5B, 4 5C. The service units 5, 5A, 5B, 5C can be moved along the machine sides on a rail construction 6. If a thread break has occurred at one of the working stations 4, or a bobbin change is to take place, one of the service units 5, 5A, 5B, 5C automatically becomes active. The rotor spinning machine 1 also comprises a cross-wound bobbin transporting device 7 arranged between the working stations 4, for conveying away completed cross-wound bobbins, as well as a bobbin delivery device 8. The bobbin delivery device 8 comprises in this case a central bobbin magazine 9 that is arranged on the end of the machine, a bobbin distribution device 10 and two bobbin conveyor belts 11,12 extending along the machine, each supplying the working stations 4 of a longitudinal side of the machine with bobbins. The service units 5, 5A, 5B, 5C are connected to the control device 14 via the lines 13 (Fig. 2). The control device 14 controls, as the central control device, the four service units 5, 5A, 5B, 5C and is in turn connected via the line 15 to the bobbin delivery device 8 and, via the lines 16, to other control devices and machine modules, not shown. When, during the spinning operation at one of the working stations 4, a cross-wound bobbin has reached the diameter provided, this is to be exchanged as quickly as possible for a new bobbin. The exchange of the full cross-wound bobbin for an empty bobbin is carried out in the embodiment by the service unit 5. The service unit 5 travels to the requesting working station 4 and is positioned there. The service unit 5 requests a bobbin from the bobbin delivery device via the control device 14. The bobbin is placed on the conveyor belt 11. The bobbin is designated by the reference numeral 17 in Fig. 1. The bobbin is moved in the arrow direction from the conveyor belt in the direction of the service unit 5. Later than the service unit 5 but still during provision of the bobbin for the service unit 5, the service unit 5A has also taken up position at a working station 4 and also requires a bobbin. This request for the bobbin is suppressed by the control device 14 until the service unit 5 has received the bobbin 17 from the bobbin position designated 17A and shown by dotted lines. As an alternative, the bobbin request from the service unit 5A is only suppressed until 5 the bobbin 17 has passed the service unit 5A and, for example, has reached the position, designated 17B, of a bobbin shown by dotted lines. Once the bobbin request from the service unit 5A is no longer suppressed, a bobbin is transported on the conveyor belt 11 to the service unit 5A. The service unit 5 can start up the working station 4 ag^in without any unnecessary delay and process subsequent requests from working stations without delay. The invention is not limited to the embodiment shown. Further embodiments of the rotor spinning machine are possible in the scope of the iivvention. / / / / / / / / / 6 We Claim: 1. Rotor spinning machine (1) comprising a plurality of working stations (4) and a bobbin supplying device extending along the machine, wherein at least two service units (5, 5A, 5B, 5C) supplying the working stations with bobbins are supplied by the supply device and wherein the rotor spinning machine (1) comprises a control device (14) for controlling the service units (5, 5A, 5B, 5C) , characterized in that the control device (14) is configured in such a way that it suppresses a subsequent bobbin request from the second service unit (5A) in the event of an existing bobbin request from the first service unit (5) positioned downstream in relation to the transporting direction of the supply device, until the initially existing bobbin request has been fulfilled. 2. Rotor spinning machine according to claim 1, wherein the control device (14) is configured in such a way that an existing first bobbin request is considered fulfilled when the first service unit (5) requesting the bobbin has received a bobbin (17). 3. Rotor spinning machine according to claim \, wherein the control device (14) is configured in such a way that an existing first bobbin request is considered fulfilled when the first requested bobbin (17) has passed the second service unit (5A). 4. Rotor spinning machine according to any one of claims 1 to 3, wherein the control device (14) is a central machine control device. Dated this 7th day of February, 2006 HIRAL CHANDRAKANT JOSHI AGENT FOR SAURER GMBH & CO. KG

Documents:

172-mumnp-2006-abstract(12-11-2007).doc

172-mumnp-2006-abstract(12-4-2002).pdf

172-mumnp-2006-abstract.doc

172-mumnp-2006-abstract.pdf

172-mumnp-2006-abstract1.jpg

172-mumnp-2006-cancelled pages(12-4-2007).pdf

172-mumnp-2006-claims(granted)-(12-11-2007).doc

172-mumnp-2006-claims(granted)-(12-4-2002).pdf

172-mumnp-2006-claims.doc

172-mumnp-2006-claims.pdf

172-mumnp-2006-correspondence(12-4-2007).pdf

172-mumnp-2006-correspondence(ipo)-(18-12-2007).pdf

172-mumnp-2006-correspondence(ipo).pdf

172-mumnp-2006-correspondence.pdf

172-mumnp-2006-description(cancelled).pdf

172-mumnp-2006-description(granted).doc

172-mumnp-2006-description(granted).pdf

172-mumnp-2006-drawing(12-4-2002).pdf

172-mumnp-2006-drawing.pdf

172-mumnp-2006-form 1(13-2-2006).pdf

172-mumnp-2006-form 1.pdf

172-mumnp-2006-form 18.pdf

172-mumnp-2006-form 19(13-2-2006).pdf

172-mumnp-2006-form 2(granted)-(12-11-2007).doc

172-mumnp-2006-form 2(granted)-(12-4-2002).pdf

172-mumnp-2006-form 2(granted).doc

172-mumnp-2006-form 2(granted).pdf

172-mumnp-2006-form 2(title page).pdf

172-mumnp-2006-form 3(8-2-2006).pdf

172-mumnp-2006-form 3.pdf

172-mumnp-2006-form 5(8-2-2006).pdf

172-mumnp-2006-form 5.pdf

172-mumnp-2006-form-pct-isa-210(12-4-2007).pdf

172-mumnp-2006-generel power of attorney.pdf

172-mumnp-2006-power of attorney(12-12-2003).pdf

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