Title of Invention

AN APPARATUS FOR FORMING A SLIVER

Abstract The invention relates to an apparatus for forming a sliver with a first regulated drafting arrangement (10) with several pairs of rollers (11, 12, 14) for the regulated drafting of the fibre mass (8) supplied to the drafting arrangement, with the fibre fleece (28) delivered by the drafting arrangement being joined and supplied to a measuring member (32) from where the measured fibre material is thereafter supplied to a second drafting arrangement (40) and with the autoleveller device (35, 52, 21) of the first drafting arrangement (10) intervening in a regulating manner in the drive of the first drafting arrangement (40) in order to compensate fluctuations in mass on the basis of the signals issued by the measuring member (32) by including a predetermined setpoint value. Various regulating and control devices are known in practice in order to obtain a high-quality sliver. In order to detect and compensate short-wave and long-wave fluctuations in mass in a simple way an apparatus is proposed, with the second drafting arrangement (40) being provided with a control device (35, 50, 48) for compensating short-wave fluctuations in mass, which device intervenes in a controlling manner in the drive of the second drafting arrangement (40) on the basis of the signals issued by the measuring member (32).
Full Text

IN 164194 and US-PS 3,440,690. Also in the field of the combing machine it is
known from IN 175661 and from JP-OS-53-86841 to provide an autoleveller device
for the drafting arrangement installed in the combing machine.
The increasingly rising production rates automatically lead to an increase in the
production speed of the fibre material or the conveying speed of the formed end
produvt (e.g. of a sliver).
This means that the requirements placed on the described autoleveller devices have
continuously risen. The requirements placed on the measuring members for measuring
the fibre masses for detecting short- and long-wave fluctuations in mass have also
risen, for example. This was caused on the one hand by the aforementioned higher
conveying speeds and on the other hand by the increasingly larger supplied masses
which are to be scarmed and also by the risen requirements with respect to the quality
ofthe end product.
The slivers formed in the described machines are usually deposited in cans by way of
special coiling apparatuses, which are then transported either manually or
automatically to a machine downstream for further processing.
There is the requirement, on the one hand, of the formation of an even sliver and, on
the other hand, of depositing an uninterrupted sliver. A sliver breakage in a can creel
leads to additional and undesirable standstill periods in the subsequent processing
process.
With the existing and known autoleveller devices in drafting arrangements it is
possible to achieve

favourable results with respect to the evenness of the formed sliver. However, these results are only partly adequate with respect to the risen requirements concerning quality and a desired coiling. Particularly the piecing positions arising during the detaching and piecing process in the combing machine can be leveled only with a considerable amount of work and partly with several drafting passages. The invention now has the object of providing an apparatus and a method for forming a sliver, which with respect to its evenness is of high quality and which ensures the coiling of an uninterrupted sliver.
In this respect it is proposed that the second drafting arrangement is provided with a control device for compensating short-wave fluctuations in mass which intervenes in the drive of the second drafting arrangement on the basis of the signals issued by the measuring member.
The measuring member, which is arranged downstream of the first drafting
arrangement, is supplied with a reduced fibre mass for the measuring process. In this
way it is possible to also use measurmg members for detecting short-wave fluctuations
in mass, e.g. for detecting piecing positions in the combing machine, which can also
detect the fibre mass with a non-mechanical device. This means that commercially
available, pure electronic or piezo-electronic sensors can be used, which on the basis
of the reduced fibre mass can carry out a very precise detection of occurring
fluctuations in mass. The fluctuations in

piecing which may occur during the piecing process are mutually displaced so that they cannot add up. The fluctuation in mass which may occur during the piecing process is thus halved with respect to the joined sliver.
By using individual electrical drives for the drafting arrangements or the coiling apparatus it is possible to provide a simple separation of certain drive zones in order to separate faulty fibre mass from the process.
Further advantages of the invention are explained in closer detail by reference to the
enclosed embodiments, wherein:
Fig. 1 shows a schematic side view of a combing machine with the arrangement
proposed in accordance with the invention.
Fig. 2 shows an enlarged partial view of the drafting arrangement devices in a top
view pursuant to fig. 1.
Fig. 3 shows a schematic side view in accordance with fig. 2 with an embodiment of a
drive device.
Fig. 4 shows a embodiment pursuant to fig. 2 with a separation apparatus for the fibre
material.
Fig. 5 shows a further embodiment pursuant to fig. 2 with a separation apparatus for
the fibre material.



We Claim:
1. An apparatus for forming a sliver with a first regulated drafting arrangement (10) having a plurality of pairs of rollers (11, 12, 14) with a first transmission for driving a pair of said pair of rollers and a first servo-motor (52) for driving said transmission for the regulated drafting of the fibre mass (8) supplied to the drafting arrangement, and passing there through, with the fibre fleece (28) delivered by the drafting arrangement being joined and supplied to a measuring member (32) from where the measured fibre material is thereafter supplied to a second drafting arrangement (40) and with a control device (35) operatively connected to the first servo-motor (52) and said measuring manner in the drive of the first drafting arrangement (10) in order to compensate fluctuations in mass on the basis of the signals delivered by the measuring member (32) thereby comprising a pre-determined target value given, characterized in that the second drafting arrangement (40) has a plurality of pairs of rollers (42, 43, 44), with a second transmission for driving a pair of said pair of rollers and a second servo-motor (50) for driving said transmission and with a control device (35) operatively connected to the second servo-motor (50) and said measuring member (32) to adjust the second transmission for intervening in a controlled manner in the drive of the second drafting arrangement (10) in order to compensate short-wave fluctuations in mass which intervenes on the basis of the signals delivered by the measuring member (32) thereby comprising a pre-determined target value given.

2. An apparatus for forming a sliver as claimed in claim 1, wherein in the pair of output rollers (14) of the first drafting arrangement (10) is connected with the first transmission of control there rotational speed with the first servo-motor (52).
3. An apparatus as claimed in one of the claims 1 or 2, wherein the pair of output rollers (44) of the second drafting arrangement (40) is connected with the second transmission to control there rotational speed with the second servo-motor (50).
4. An apparatus as claimed in claim 3, wherein the sliver (53) formed in the second drafting arrangement (40) is deposited in a storage means (64) by way of a coiling apparatus (66, 68, 69) and the drive (75) of the coiling apparatus (66, 68, 69) as well as the drive of the pair of input rollers (42) of the second drafting arrangement (40) are drivably coupled with the drive (21) of the pair of output rollers (14) of the first drafting arrangement (10).
5. An apparatus as claimed in claim 4, wherein a measuring member (55) for monitoring the sliver (53) delivered by the second drafting arrangement (40) is arranged between the pair of output rollers (44) of the second drafting arrangement (40) and the coiling apparatus (66, 68, 69).

6. An apparatus as claimed in one of the claims 1 to 5, wherein the autoleveller device (35, 50, 48) for the first drafting arrangement (10) is provided with a timing element (54) by means of which the drive of the drafting arrangements (10,40), the coiling apparatus (66, 68, 69) and the feed devices (2) for feeding the fibre mass is stopped when the deviation of the mass determined by the measuring member (32) exceeds a specific tolerance threshold during a predetermined interval with respect a predetermined setpoint value.
7. An apparatus as claimed in one of the claims 1 to 6, wherein an apparatus (29, 26, 27, 34) for separating from the normal conveying direction (F) the fibre material (28) delivered from the first drafting arrangement (10) is arranged between the first drafting arrangement (10) and the second drafting arrangement (40).
8. An apparatus as claimed in claim 7, wherein an apparatus (58, 58a, 58b) for piecing a new sliver end to a trailing sliver end (30) is arranged downstream between the measuring member (32) and the apparatus (29, 26, 27, 34) for separating the fibre material (28).
9. An apparatus as claimed in claim 8, wherein the drive of the feed device and of the first drafting arrangement (10) can be separated by a device (K) at least temporarily from the drive of the second drafting arrangement (40) and of the coiling apparatus (66, 68, 69).

10. An apparatus as claimed in one of the claims 8 or 9, wherein after the drafting process at least two slivers (30a, 30b) are formed from the fibre mass supplied to the first drafting arrangement (10), which slivers are joined in the measuring member (32) and are supplied to the drafting arrangement (40) downstream, and the piecing apparatus (58a, 58b) is arranged in the zone of the formed individual slivers in such a way that the piecing places (AI, A2) of the two slivers formed during the piecing process do not meet during the joining.
11. An apparatus as claimed in one of the claims 4 to 11, wherein at least one drafting arrangement (10, 40) and/or the coiling apparatus are equipped with electronic individual drives (Ml to M5) which are at least partly drivably coupled with one another by way of a control unit (95).
12. A method for forming a sliver with two drafting arrangements (10, 40) arranged behind one another, with a measuring member (32) for the fibre material supplied by the first drafting arrangement (10) being arranged between the drafting arrangements, characterized by the following process steps
drafting of the supplied fibre mass (8) in a regulated manner;
joining of the drafted fibre mass (28);
measurement of the joined fibre mass (30);
transferring of the measurement signal to the autoleveller device (35, 52, 21) of the first drafting arrangement (10) and to the control device (35, 50, 48) of the second drafting arrangement (40);

drafting of the sliver (30)in a controlled manner supplied by the measuring member (32);
coiling of the sliver (53).


Documents:

695-mas-1997- abstract.pdf

695-mas-1997- claims duplicate.pdf

695-mas-1997- claims original.pdf

695-mas-1997- correspondence others.pdf

695-mas-1997- correspondence po.pdf

695-mas-1997- descripition complete duplicate.pdf

695-mas-1997- descripition complete original.pdf

695-mas-1997- drawings.pdf

695-mas-1997- form 1.pdf

695-mas-1997- form 26.pdf

695-mas-1997- form 3.pdf

695-mas-1997- form 5.pdf

695-mas-1997- form 6.pdf


Patent Number 204498
Indian Patent Application Number 695/MAS/1997
PG Journal Number 26/2007
Publication Date 29-Jun-2007
Grant Date 22-Feb-2007
Date of Filing 02-Apr-1997
Name of Patentee MASCHINENFABRIK RIETER AG,
Applicant Address KLOSTERSTRASSE 20, CH-8406,,WINTERTHUR,,
Inventors:
# Inventor's Name Inventor's Address
1 SLAVIK WALTER STADACHERSTRASSE 41,CH-8320 FEHRALTORF
2 GSCHLIESSER GERD, GARTNERSTRASSE 13,CH-8404 WINTERTHUR
3 PIETRINI VIKTOR WEINGARTENSTRASSE 20,CH-8372 WIEZIKON BEI SIRNACH
4 SIGRIST THOMAS BLEICHESTRSSE 29,CH-8400 WINTERHTUR
5 FISHCHER RONALD ROHRHALDENSTRASSE 6,ch-8712 stafa
PCT International Classification Number D01H5/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 0854/96 1996-04-02 Switzerland