Textiles: spinning – twisting – and twining – Apparatus and processes – Doffing or donning
Patent
1998-01-30
2000-03-21
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Doffing or donning
57 67, 57 70, D01H 900
Patent
active
060388455
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national stage of PCT/DE97/01387 filed Jun. 28, 1997 and based upon German national applications 196 28 667.0 filed Jul. 16, 1996 and 197 17 523.6 filed Apr. 25, 1997 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a process for bobbin replacement on a roving machine provided with a drafting frame, flyers, bobbins and a bobbin rail, in which while the roving machine is running, a sliver end of each sliver supplied by the drafting unit is applied to an empty sleeve.
BACKGROUND OF THE INVENTION
Generally in the state of the art, after a bobbin replacement on a roving machine, in which the pressing fingers generally remain in outwardly swung positions, from the guide eye of the pressing finger end the sliver end hanging out must be applied to the new empty sleeve. For this purpose the sleeve is provided with a sliver catcher region, for example, in the form of a so-called burr strip which engages the sliver end when it is applied to the sleeve. To achieve this, the roving machine is set into operation whereby the pressing finger under the effect of centrifugal force comes to lie against the sleeve.
Roving machines with single drives thus apply the driving force to all of the elements, i.e. the drafting frame, the flyers, the bobbins and the bobbin rail simultaneously. Since the application of the pressing finger against the sleeve and thus the acquisition of the sliver by the sleeve can be effected only when a certain minimum speed is reached, the sliver is not seized for the first few rotations. The sliver, during this interval, is not drawn from the drafting frame and since the latter is in operation, a sag develops in the sliver between the drafting frame and the flyer head. As a result, the sliver can loop around the flyer head which can give rise to a breakage in the sliver when the roving frame is not temporarily stopped and the sleeve rotated by hand. In any case, the sag in the sliver must be eliminated by the take-up of the excess between the flyer and the bobbin.
Similar problems are found also for roving machines with separately controllable drives of the flyer, the bobbin, the drafting unit and the bobbin rail.
OBJECT OF THE INVENTION
The present invention has as its object to provide a process and a corresponding apparatus for bobbin replacement in which this problem is obviated and whereby it can be ensured that the sliver end is engaged in a reliable manner such that undesired sag between the drafting frame and the flyer head is avoided.
SUMMARY OF THE INVENTION
This object is achieved according to the invention in that initially only the flyers and the spindles (but not the drafting frame) of the roving machine are driven. The flyers and the spindles are either driven immediately forwardly or are initially driven backwards, are brought to standstill after a given time interval and then are driven forwardly, whereby the standstill of the flyers and the spindles can coincide or are offset in time.
After the start of the forward drive of the flyers and bobbins, the drafting frame which has been delayed in operation for a time interval, is set into operation.
By "forward drive" is meant the drive of the flyer and bobbin in the normal sense of rotation while "backwards drive" of the flyer and the bobbin means rotation in the sense opposite normal rotational direction.
For application of the sliver to the sleeve only the flyers and the spindles are set in rotation preferably with the same speed, while the drafting frame remains at rest. As a result, the pressing finger and the sliver come to lie against the sleeves without the formation of a sag of the supplied but not gripped sliver. Only thereafter is the drafting frame set into operation and, indeed, with a slowed supply for example for a length of about 5 centimeters, whereby the sliver end which has been brought into contact with the burr strip, is securely engaged. Only thereafter is the roving machine restored to its
REFERENCES:
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patent: 5259179 (1993-11-01), Sekiya et al.
patent: 5341633 (1994-08-01), Nishikawa et al.
patent: 5560193 (1996-10-01), Sekiya et al.
patent: 5904036 (1999-05-01), Machnik et al.
Melliand Textilberichte Prof. Dr. sc. techn. Roland Backmann, Dr.-Ing. Gerhard Laux, Dr.-Ing. Mathiaas Pfalz, pp. 7 to 9.
"Weiterentwicklung des Flyers" by R. Backmann et al., Mellian Textilberichte 69 (1988) Jan. No. 1.
"Multimotor Drives for Textile Machines", EAAT GmbH Chemnitz Germany, publication date Sep. 19, 1995.
Machnik Franz
Weeger Hans-Peter
Dubno Herbert
Stryjewski William
Zinser Textilmaschinen GmbH
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