U.S. patent application number 09/747789 was filed with the patent office on 2001-11-22 for spin machine with several single drives.
Invention is credited to Bahlmann, Bernd, Edmund, Schuller, Erich, Bock, Paweletz, Anton.
Application Number | 20010042365 09/747789 |
Document ID | / |
Family ID | 7934806 |
Filed Date | 2001-11-22 |
United States Patent
Application |
20010042365 |
Kind Code |
A1 |
Paweletz, Anton ; et
al. |
November 22, 2001 |
Spin machine with several single drives
Abstract
In a spinning machine with at least one spinning station (1)
which station possesses a feed drum (2), driven by a single drive
(12), a disintegrator (3), a rotor (4), a withdrawal roll (5) and a
spool roll (7), provision has been made, that the spinning station
(1) has an additional single drive (15, 16, 17) respectively for
the withdrawal roll (5) and/or the spool roll (7) and/or a paraffin
roll (6) and that the speed of rotation ratio of the single drives
(12, 15, 16, 17) can be preset to specified values.
Inventors: |
Paweletz, Anton; (Fellbach,
DE) ; Bahlmann, Bernd; (Schrobenhausen, DE) ;
Erich, Bock; (Wettstetten, DE) ; Edmund,
Schuller; (Ingolstadt, DE) |
Correspondence
Address: |
STEPHEN E. BONDURA, ESQ.
DORITY & MANNING, P.A.
P.O. BOX 1449
GREENVILLE
SC
29602-1449
US
|
Family ID: |
7934806 |
Appl. No.: |
09/747789 |
Filed: |
June 8, 2001 |
Current U.S.
Class: |
57/264 ;
57/400 |
Current CPC
Class: |
D01H 13/308 20130101;
Y02P 70/621 20151101; D01H 4/44 20130101; D01H 4/50 20130101; Y02P
70/623 20151101; Y02P 70/62 20151101 |
Class at
Publication: |
57/264 ;
57/400 |
International
Class: |
D01H 013/26; D02G
001/00; D01H 009/10; D01H 007/92; D01H 007/46 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 29, 1999 |
DE |
199 63 472.6 |
Claims
1. A spinning machine with at least one spinning station (1) which
station possesses a feed drum (2) driven by a single drive (12), a
disintegrator (3), a rotor (4), a withdrawal roll (5) and a spool
roll (7), therein characterized, in that the spinning station (1)
possesses additional single drives (15, 16, 17) respectively for
the withdrawal roll (5) and/or for the spool roll (7) and/or for a
paraffin roll (6) and in that the speed of rotation ratios of the
single drives are capable of being preset to specified values.
2. A spinning machine in accord with claim (1), therein
characterized, in that one of the single drives (12, 15, 16, 17) is
designed to be a lead motor operating with a preset speed of
rotation or a preselected rotational frequency for at least one
other single drive.
3. A spinning machine in accord with claim 2, therein
characterized, in that the single drive (12) of the feed drum (2)
is designed to be a lead motor with a preset speed of rotation or a
preselected rotational frequency.
4. A spinning machine in accord with one of the foregoing claims,
characterized by a power control center (20) assigned to each
spinning position (1) for the regulation and electric current
supply of the single drives (12, 15, 16, 17).
5. A spinning machine in accord with claim 4, therein
characterized, in that the power control center 20 is placed on or
near one of the single drives (12, 15, 16, 17).
6. A spinning machine in accord with one of the claims 2 to 5,
therein characterized, in that of the single drives (12, 15, 16,
17) the lead motor thereof is connected to the others by at least
one frequency generator (22, 24, 26), wherewith the preset speed of
rotation ratios of the single drives (12, 15, 16, 17) can be
implemented.
7. A spinning machine in accord with one of the foregoing claims,
therein characterized, in that at least one of the single drives
(12, 15, 16, 17) is designed as a stepping motor.
8. A spinning machine in accord with one of the foregoing claims,
therein characterized, in that the single drive (16), designed as a
stepping motor for the paraffin roll (6) follows the lead stepping
motor (12) for the feed drum (2) by means of a power control center
(20) as well as a frequency generator (24).
Description
[0001] The invention concerns a spinning machine with at least one
spinning station, which station possesses a feed drum driven by a
single drive, a disintegrating roll, a rotor, a withdrawal roll and
a spool roll.
[0002] EP 0 385 530 discloses such a spinning machine, in which the
feed drum of each spinning position of an open-end spinning machine
is driven by means of a stepping motor. A control system with an
associated computer regulates the corresponding stepping motor in
each spinning machine in accord with its direction of rotation, its
speed of rotation and the angular position of the drive, and
thereby also the feed drum. A control system for each of the
stepping motors is advantageous, so that the necessary precision in
regard to the feed of the fiber band is assured.
[0003] In the conventional spinning machines, normally, the
rotating elements which follow the feed drum in the direction of
the band movement, for example, the rotor, are centrally driven by
means of motors provided on an end of the spinning machine. In
order to achieve the necessary correlation of the speed of
rotation, for instance, of the feed roll, the withdrawal roll, and
the spool roll, it is usual to provide electrically controlled,
mechanical gear drives. By this means, each spinning station can
produce constant thread quality where thread diameter and strength
is concerned. Such gear drives possess, however, a great number of
points of abrasion, which give rise to a relatively substantial
demand of expense and maintenance time. Additionally, a relatively
large startup momentum can be attributed to these gear drives.
Where the necessary electrical control is concerned, considerable
costs are involved in the wiring and its installation.
[0004] Thus, it is the purpose of the invention, to make available
a spinning machine of the kind mentioned in the introductory
passages, in which is made possible a simple, and therefore
precise, drive of the individual rotational elements of a spinning
station.
[0005] This purpose, in the case of the spinning machine of the
kind mentioned in the introductory passages, is achieved, in that
the spinning station exhibits, respectively for the withdrawal
roll, and/or the spool roll, and/or the waxing roll, an additional
single drive, and that the rotational ratios of the single drive
can be set to specification.
[0006] The advantage of the invention can be particularly seen in
that--besides each feed drum--an individual drive has been assigned
to each withdrawal roll, and/or to the spool roll, and/or to for
waxing roll. Since the rotational ratios of the individual drives
of each spinning station can be specified, an optimized correlation
in regard to synchronization, operational life, and rotational
speed is assured. Furthermore, by means of the installation of the
single drives, expensive, and thereby damage-prone gear drive
construction is avoided, which otherwise would extend itself over
the entire length of the spinning machine. Another advantage is
that with this single drive, a very low degree of nominal torque is
present, because of the small friction to which the individual
drives are exposed. Especially, no torsional delays occur upon the
startup of the respective rotational elements of the spinning
stations, which are situated remotely from the central motor. A
single drive, as an example, is also advantageous for the
withdrawal roll, since this, upon spin-startup is driven in reverse
direction, so that the spinning startup process is made
substantially more easy.
[0007] Advantageously, one of the individual drives serves as a
lead motor. This has a specified guiding rotational speed or a
specified guide frequency, to which is related the rotational speed
of at least one single drive, and preferably, where multiple drives
are concerned, the rotational speeds of all other single drives. In
this manner, the RPM of all other single drives refers back to the
said lead drive and the rotational speeds of the other drives can
thus be preset.
[0008] Particularly advantageously, the feed motor of the feed drum
is designated to be the guide motor, since first, this rotates at a
relatively low rotational speed (1-150 RPM) and second, must hold
to the currently set rotational speed with great precision. Even
small deviations lead to an undesirable variation of the set values
of the thread to be spun. Although the single drive of the feed
drum is chosen as the lead motor, this is not dependent upon the
guidelines of other drives. Much more, rotational speed of the lead
motor can be directly and precisely adjusted. Because of the
mentioned achievable exactness of its rotational speed, with an
appropriate ratio control, a uniform torque for the other single
drives is possible in all RPM ranges.
[0009] In an advantageous manner, for each spinning station, only
one power control center for the regulation and the supply of
electrical current to the individual drive need be provided. This
design has the advantage, that the electronic circuitry need be
installed only once, since this serves in common for all individual
drives per spinning station. On this account long cable hook-ups
from a central network, which then must run along the entire
spinning machine, are no longer necessary.
[0010] In order to further reduce extensive constructional work and
wiring, the power control center is placed on or near one of the
individual drives. For instance, the power control center is
screwed within or onto the housing of the feed drum. For the wiring
thereof, corresponding borings are made through the housing. From
the power control center, the additional control and power lines
run to the other individual drives. Principally, the power control
center can be provided at any of the other individual drives. For
the eventual placement, the spatial conditions in the spinning
station must be taken into consideration, so that, besides space
saving, maintenance and cleaning services can be carried out with
good accessibility.
[0011] The rotational speed of the other single drives, in relation
to the lead motor, is advantageously effected by a frequency
generator. For instance, there is respectively one frequency
generator between the power control center, to which the lead motor
is connected, and any of the single drives which is to be
controlled. Alternatively, simply a single frequency generator can
be furnished which transmits to the individual drives, by means of
a frequency divider, the rotational speed commands based on those
of the lead motor.
[0012] The invention allows, that a very fine subdividing of the
motor rotation speed for the lead motor and/or the individual
drives, may be undertaken in micro-stepping, so that practically,
feedback-free operation of this motor is possible.
[0013] Particularly advantageous is to design at least one of the
single drives as a stepping motor. Stepping motors have the
advantage, that they possess only very few parts, and certainly no
gear drives which are susceptible to wear and tear. Further,
stepping motors possess the advantage, that, while maintaining high
efficiency, a relatively small inertial moment is in effect,
wherein, their shafts start to rotate without inrush current to the
motor, that is, the motor can be quickly accelerated. In addition,
stepping motors can be simply and precisely controlled and react
very quickly to control commands. Further, stepping motors can be
brought up to top speed on a continuous basis and in addition can
be driven in the reverse direction. In regard to the economics, the
stepping motor has no decisive disadvantage as compared to the
synchronous motor. By the use of a stepping motor for the feed
drum, this motor is preferable in a range of 1 to 150 RPM and can
be run at a nearly constant torque.
[0014] Especially at a paraffin roll, which serves for the waxing
of the thread before the windup on the spool, the installation of a
stepping motor is of advantage. Conventionally, for the drive of a
paraffin roll, a synchronous motor is selected. On the grounds of
the mechanical gear drive in such a motor, during startup of the
roll, relatively great frictional forces must be overcome. To this
purpose, the motor customarily calls for excess current. This
characteristic increases the complexity of the control, i.e. of
constant monitoring. Alternatively, a larger motor could be
selected, which, however would have an even greater demand for
current at startup. By means of the selection of a stepping motor,
all these problems are prevented.
[0015] For the feed drum of each spinning station, the use of a
stepping motor is likewise of advantage, as has already be made
plain by the above description of the state of the technology. In
particular, the doing away with extensive and failure-prone gear
drives, as well as acquiring precision of the RPM even in the lower
rotational speed ranges are advantages to be valued.
[0016] This said precision permits running the spinning station as
a "stand alone machine" with the corresponding demands for a high
degree of precision. The installation of stepping motors for the
individual drive of the withdrawal roll and/or the spool roll--if
such individual drives are provided--is, because of the above
mentioned grounds, also advantageous.
[0017] In a particularly preferred embodiment of the invention, the
stepping motor for the paraffin roll is regulated by the lead
stepping motor of the feed drum, in that a power control center
delivers a signal through the frequency generator and over a line
to the stepping motor for the said paraffin roll. Should the feed
drum, for instance, be turning at 10 RPM and if the frequency
generator is set at a rotational speed ratio of 5:1, then the
paraffin roll rotates at 2 RPM. In such an operation,
advantageously, small micro-step subdivisions per motor revolution
are not necessary.
[0018] Advantageous developments of the invention are characterized
by the features of the subordinate claims.
[0019] In the following, an embodiment of the invention will be
more closely described with the aid of the drawing. In this FIGURE
a spinning station 1 of a spinning machine is schematically
presented. With a plurality of similar spinning stations 1, these
are customarily placed beside one another, which, in composite,
form the spinning machine. The spinning station 1 possesses--in the
direction of travel of the fiber band--in sequential array:
[0020] a feed drum 2
[0021] a disintegrator 3
[0022] a rotor 4
[0023] a withdrawal roll 5
[0024] a paraffin roll 6 with auxiliary
[0025] paraffining block 8 and
[0026] a spool roll 7
[0027] Emerging from a (not shown) stretch works, the fiber band B
makes its way to the feed drum 2, which is circumferentially and
axially corrugated and which conveys the fiber band B to the
disintegrator roll 3.
[0028] Equipped with circumferential comblike teeth 13, the
disintegrator separates the band B into individual fibers. By means
of a funnel shaped conduit 14, and under a suction, the stream of
individual fibers enters the rotor 4. The rotor 4 rotates, by means
of a central drive for all rotors of the spinning machine, at
speeds of rotation exceeding 100,000 RPM and spins the fibers into
a thread F. This thread F is subsequently removed from said rotor
by the withdrawal roll 5 together with roll 11 which exerts a
rolling pressure on the withdrawal roll 5. After this the thread F
is guided to frictional contact with the paraffin block 8 and then
is transported by the paraffin roll 6, which turns at a low rate of
speed. Continuing in motion the thread is finally wound onto a
spool 10 which is axially supported by a rotating core 9. The spool
10 lies with its own weight against the spool roll 7 and obtains
its rotational energy therefrom.
[0029] The feed drum 2 is connected to an individual drive 12
designed as a stepping motor. In the embodiment presented in the
figure, the withdrawal roll 5 is connected with a single drive 15,
the paraffin roll 6 with a single drive 16 and the spool roll 7
with its own drive 17. The stepping motor for the feed drum 2, in
the depicted embodiment, is designed a lead motor with a
specifically set lead RPM or with a given lead frequency. This said
lead RPM determines the RPM of the remaining drives 15, 16 and 17.
The speed of rotation of the motor 12 is controlled by a power
control center 20, which with the input of either the specified
lead frequency or the lead speed of rotation of said motor 12,
transmits the respective frequencies (or RPM's) to the said
individual motors 15, 16, 17 by means of electrical lines 23, 25,
27. Between the power control center 20 and the individual drives
15, 16, 17, respectively, a frequency generator 22, 24, 26 is
inserted into the circuit, for the purpose of presetting to
specific values the speeds of rotation of the single drives 15, 16
17.
[0030] The individual drives 15, 16 17 can be designed as stepping
motors, in like manner to the individual drive 12 of the feed drum
2. Stepping motors have, in such an application, among other
preferable features, the advantage that they possess no gear drives
subject to wear and tear. The supposed disadvantage, that stepping
motors must be directly controlled, was countered by the invention,
in that simply a single power control center is provided, by means
of which, the rotational ratios--derived from either the frequency
or the RPM of a lead motor--can be preset to specified values.
[0031] The single power control center 20 serves likewise for the
power distribution to the individual drives 12, 15, 16, 17. Not
only does this allow space to be saved within the spinning station,
but also the expenditure in wiring and attendant labor within a
spinning station can be held at a low level. The power control
center 20 is, for instance, placed directly on the stepping motor
12 of the feed drum 2. possibly screwed onto the housing thereof.
From this point the electrical control lines 23, 25 27 run
respectively to the other individual drives associated with the
given spinning station. The frequency generators 22, 24, 26 can
likewise by incorporated into the power control center.
[0032] In an embodiment which is not illustrated, another motor is
proposed as lead motor instead of the individual motor 12 of the
feed drum 2. In the case of additional, not shown, embodiments,
besides the individual motor 12 for the feed drum 2, simply one or
two of the individual drives 15, 16, 17 are foreseen as the drive
of one or two of the rolls 5, 6, 7. Especially, the possibility
exists of using an individual drive 16, designed as a stepping
motor, for the paraffin roll 6 and to control this by the
individual drive 12 for the feed roll 2 by means of the power
control center 20 as well as with the frequency generator 24. In
this manner, no problems will arise upon startup of the paraffin
roll 6, since lesser frictional force is to be overcome than is the
case with the conventionally employed synchronous motor. Thus an
otherwise necessary, heavy inrush current at startup for the
paraffin roll can be avoided. Moreover, a single drive 16 for the
paraffin roll 6 shows little wear, so the maintenance and cleaning
expenses are kept at a low level.
* * * * *