Textiles: fiber preparation – Working – Drafting
Reexamination Certificate
2001-03-05
2002-05-28
Nerbun, Peter (Department: 3765)
Textiles: fiber preparation
Working
Drafting
C019S150000, C019S240000
Reexamination Certificate
active
06393667
ABSTRACT:
The invention relates to a machine for processing textile material with at least one sliver-forming device and a coiler and at least one drafting arrangement between the sliver-forming device and the coiler (can press, can coiler).
Such arrangements are known for example from EP-A-376 002, EP-B-640 704, EP-A-799 916, DE-A-195 09 781, DE-A-197 21 758, DE-A-296 22 923 and U.S. Pat. No. 3,402,433. It is known for example to provide a combing machine with a regulated drafting arrangement as is shown in the aforementioned specification EP-A-376 002. The cited DE-A-197 21 758 further discloses an apparatus in which a carding machine can comprise a drive for the sliver-supplying elements and the draw frame or the coiler.
Also known are so-called draw frames for doubling and drawing slivers which can be produced by carding or combing machines. The most essential component of such a machine is the drafting arrangement. Examples of such draw frames are disclosed in DE-A-195 48 840, EP-A-608 502, DE-A44 24 490 and DE-A41 42 038. The “doubling” means that such machines are designed for drawing in and processing several slivers (e.g. six or eight slivers), with the overall draft of the drafting arrangement usually being adjusted to the number of incoming slivers.
SUMMARY
Ojects and advantages of the invention will be set forth in part in the following description, or may be obvious fromthe description, or may be learned through practice of the invention.
The present invention provides a machine for processing textile material with a drafting arrangement and a coiler, with the drafting arrangement being formed by a subassembly of a draw frame for the doubling and drawing of several slivers. If the textile machine concerns a carding machine, only one (or not more than two slivers in the case of a pair of carding machines) will be supplied to the draw frame.
As a result, the integration of a previously autonomously operating draw frame in a machine which also previously operated autonomously, such as a carding or combing machine, is hereby proposed. In a further variant such as in the application of a combing machine, a further drafting arrangement in the form of a subassembly of a draw frame for doubling and drafting several slivers is interposed between a first drafting arrangement assigned to the machine and the coiler, although the combing machine including the drafting arrangement assigned to the same will only supply one sliver in this case. The operating devices of the two mutually cooperating machines are preferably adjusted to one another in order to eliminate any avoidable detours by the operating personnel. This may require an adjustment of the direction of flow of the one or other machine.
The drafting arrangement assigned to the subsassembly can be provided with the usual infrastructure of the draw frame such as the frame and the drive and operating devices. The creel of the conventional draw frame can be replaced by a transfer device which forwards the sliver material supplied by the machine that processes the textile material to the further drafting arrangement.
A modern drive system for a textile machine is based on the frequency converter technology (see for example “Drehstrommotoren mit Frequenzumrichtern für Textilmaschinen”—“Rotary current motors with frequency converters for textile machines” (Textil Praxis International 1992, January, pages 37,38)). Such a drive is shown for example for a carding machine in DD-A-224626. Several converters (single converters) are used in this case. It was proven according to EP-A-671 355 that such drive systems can be extended in order to include the coiler too, although wrong drafts can be produced particularly easily in the sliver path between the machine and the coiler.
According to an embodiment of the present invention the drafting arrangement is provided in the first variant with a predetermined (optionally adjustable) draft, with both the drive for the textile machine as well as the drive for the drafting arrangement comprising at least one frequency-controlled rotary current motor. A common frequency converter or a pair of frequency converters is provided for supplying said motors, with the converters of one pair being mutually coupled in order to provide the same output frequency or output frequencies at a predeterminable ratio. The rotary current motors can preferably be asynchronous motors, i.e. motors which due to slip are provided with load-dependent speed characteristic at constant feed frequency. Such a characteristic (despite the risk of a wrong draft) can be used because it has been seen that the expected changes in load during operation have such similar behaviour at the relevant places that the difference of the relative speed faults (i.e. the difference in speed as compared with the synchronous speeds) remain within very narrow limits (acceptable tolerances) in practical operation.
It is therefore accordingly possible to provide a drive system for a textile machine which produces and further process slivers, where both the sliver-supplying elements as well as the processing elements are driven by motors which are provided with a load-dependent speed characteristic. The drive system preferably comprises a motor control unit which is designed in such a way that any slip of the motor that occurs in operation remains within predeterminable limits. The control unit preferably comprises a controllable power unit which supplies the said motors. The power unit is preferably controllable concerning the frequency of the thus supplied electric power. Is comprises for example at least one frequency converter and the aforementioned motors are then preferably motors which can be controlled by way of the feed frequency. For cost reasons, rotary current asynchronous motors (such as squirrel-cage induction motors) will usually be chosen, with the use of other motors which are controllable by way of the frequency (such as reluctance or even synchronous motors) not being excluded. The preferred type of motor is the so-called geared motor. The effective speed of such a motor is influenced both by the feed frequency as well as the multiplication or gear reduction of the gear associated with the motor. The gear can comprise change points, so that the effective speed at a given feed frequency can be set. The overall system is preferably arranged in such a way, however, that no change points are required.
The drive for the drafting arrangement can comprise several motors. It is also possible to provide only one single motor in the drive of the drafting arrangement, which then requires a mechanical transmission of the motor output to different elements of the drafting arrangement.
The invention provides a respective apparatus, with a drafting arrangement for application between the sliver-forming device and the coiler of a textile machine, with the coiler being formed by a subassembly of a draw frame for doubling and drafting slivers, with the subassembly also comprising the drafting arrangement of the draw frame.
It is further proposed that the subassembly comprises a drafting arrangement with a delivery speed in excess of 400 m per minute.
It is preferably proposed that the drafting arrangement of the subassembly is arranged as an evening unit, meaning that the drafting arrangement is provided with a regulating or control device in order to ensure the formation of an even sliver.
The feed table of the draw frame can be equipped with a sliver guide element for a single sliver.
Current carding machines show delivery speeds of between 10 m per min. and 300 m per min. The sliver titre is usually in a range of 3.5 to 6.5 ktex. The drive motors of the sliver-supplying elements for the carding machine (the outlet) show speeds of between 150 and 4,500 rpm at feed frequencies of between 5 and 150 Hertz. The required output of a frequency converter is in the range of 1.5 to 3 kW to supply the card outlet as well as the drafting arrangement with power.
The invention also deals with the improvement of the degree of fibre alignment and the reduction of
Faas Jürg
Müller Christian
Näf Beat
Pietrini Viktor
Slavik Walter
Dority & Manning
Maschinenfabrik Rieter AG
Nerbun Peter
Welch Gary L.
LandOfFree
Machine with a drafting arrangement for processing textile... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Machine with a drafting arrangement for processing textile..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Machine with a drafting arrangement for processing textile... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2907024