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Apparatus at a draw frame having a drawing mechanism for
the doubling and drafting of fibre slivers, having an
adjusting device
The invention relates to an apparatus at a draw frame
havinga drawing mechanism for the doubling and drafting of
fibre slivers, having a drawing mechanism frame for
accommodating the drawing mechanism, which has at least two
pairs of rollers each comprising an upper roller and a
lower roller, having means for adjusting the spacing of at
least one of the lower rollers in relation to another lower
roller, in each case having a mounting device for
accommodating the lower roller, wherein lower rollers are
arranged to be driven by at least one drive element
endlessly revolving around pulley wheels and wherein each
lower roller has a roller-driving pulley wheel.
In a known apparatus (DE-OS 20 44 996), the mountings of
the intake and middle lower rollers are displaceable on the
frame of the machine so that the extent of the drawing zone
can be matched to the particular fibre staple. A tensioning
pulley wheel, which is displaceable in a guideway in the
frame of the machine, allows the length of the toothed belt
to be modified in accordance with, the changed spacing
between the axes of the middle roller and a guide pulley
wheel, brought about by displacement of the intake roller.
The middle roller is driver, by a further toothed belt. The
wheel which is fastened to the machine frame and which can
pivot about one axis; as a result, it can also be matched
tc changed spacings between the axes of the intake roller
and middle roller. It is disadvantageous that displacing
devices for displacement of the intake roller and the
middle roller and additional tensioning devices for re-
tensloning of the toothed belts after the displacement
operations are necessary, requiring a considerable outlay
in terms of construction. In addition, it is disadvant-
ageous that a number of work steps are required for the
displacement operations ar.d the subsequent re-tensioning
operations. The belt tension is destroyed by the
displacement process. Where the displacement is carried cut
manually, spacers are inserted between the mountings, the
mountings being pushed against ths spacers so that, in this
case too, the amount of set-up work is considerable.
Finally, the displacement and re-tensioning operations
result in a doubling of potential error sources when
setting the spacings and belt tensions.
The problem underlying the invention is accordingly to
provide an apparatus of the kind described at the beginning
that, avoids the disadvantages mentioned and that especially
is of simple construction and allows a considerable
reduction in the work and time required for adjustment of
the slider(s) ana, accordingly, of the extent (s) of the
drawing zone(s), without re-tensioning the drive belt after
the adjustment.
The invention provides an apparatus at a draw frame
having a drawing mechanism for the doubling and drafting of
fibre slivers, having a drawing mechanism frame for
accommodating the drawing mechanism, which has at least two
pairs of rollers each comprising an upper roller and a
lower roller, having means for adjusting the spacing of at
least one of the lower rollers in relation to another lower
roller, in each case having a mounting device for
accommodating the lower roller, wherein lower rollers are
arranged to be driven by at least one drive element
endlessly revolving around pulley wheels, characterised in
that at least one guide pulley wheel is attached to each
mounting device; and the roller-driving pulley wheel and
guide pulley wheel act, in each case one after the other,
on both sides cf the tensioned drive element.
The measures according to the invention make it
possible, by simple means, for the mountings and, as a
result, the extents of the drawing zones (nip line
spacings) to be adjusted in a short time. For the purpose
of adjusting the extents of the drawing zones, elegant use
is made of existing structural elements necessarily present
in the draw frame, namely a roller-driving pulley wheel and
the drive belt. Separate apparatuses for adjustment are not
required. As a result of the fact that the drive belt is in
tension before, during and after adjustment, further
apparatuses for re-tensioning the drive belt after the
adjustment are not required, which allows the extents of
the drawing zones of the draw frame to be changed in a
short time by means that are especially simple in terms of
construction.
Claims 2 to 58 contain advantageous developments of the
invention.
The invention will be described hereinafter in greater
detail with reference to exemplary embodiments shown in the
drawings, ir. which:
Fig. 1 shows, in a diagrammatic side view, an
autoleveller draw frame for the
apparatus according to the invention
together with a general circuit
diagram
Fig. 2 shows the dispiaceable mounting of the
intake and middle lower rollers;
Figs. 3e and 3b show the drive for the intake and
middle lower rollers for the draw frame
according to Fig. 1, in a side view
(Fig. 3a) and plan view (Fig. 3b);
Figs. 4a to 4c show, in diagrammatic form, the
sequential procedure for shortening of
the preliminary and main draft zones;
Figs. 5a and 5b shew the intake and middle lower
rollers before displacement (Fig. 5a)
and after displacement (Fig. 5b).;
Figs'. 6a and 6b show, in diagrammatic form, an electro-
magnetic braking apparatus for a
tcothed belt wheel;
Fig. 7 shows a locking device for a slider;
Fig. 9 shows a connection element (bridge) for
connecting two sliders;
Fig. 9 shows an embodiment comprising a
drawing mechanism having three roller
combinations, each having its own drive
meter;
Fig. 1C shows input devices for manual and/or
memory-assisted input of adjustment
valuem for changing the nip line
spacings in the drawing mechanism; and
Fig. 11 shows an upper roller lifted off from a
lower roller.
In accordance with Figure 1, a draw frame 1, for
example a Trutzschler HSR draw frame, has a drawing
mechanism 2, upstream of which is an intake 3 of the
drawing mechanism and downstream of which is an exit 4 from
the drawing mechanism. The fibre slivers 5, coning from
cans (not shown), encer tne sliver guide 6 and, drawn by
the draw-eff rollers 1, 9, are transported past the
measuring element 9. The drawing mechanism 2 is"designed as
a 4-over-3 drawing mechanism,.that is to say it consists of
three lower rollers I, II, III (I delivery lower roller, II
middle lower roller, III intake lower roller) and four
upper rollers 11, 12, 13, 14. Drafting of the fibre sliver
combination 5' from a plurality of fibre slivers 5 is
carried out in the drawing mechanism 2. Drafting is
composed of preliminary drafting and main drafting. The
roller pairs 14/III and 13/II 'form the preliminary draft
zone and the roller pairs 13/II and 11, 12/I form the main
draft zone.
The attenuated fibre slivers 5 reach a web guide 10 in
the exit 4 from the drawing mechanism and, by means of the
draw-off rollers 15, 16, are drawn through a sliver
funnel 17, in which they are combined to form one fibre
sliver 13, which is then deposited in cans. Reference
letter A denotes the work direction.
The draw-off rollers 7, 8, the intake lower roller III
and the middle lower roller II, which are connected to one
another mechanically, for example by toothed belts, are
driven by the control motor 19, it being possible, in the
process, for a desired value to be specified. (The
associated upper rollers 14 and 13, respectively, revolve
by virtue of the motion of the lower rollers.) The delivery
lower roller I and the draw-off rollers 15, 15 are driver,
by the main motor 20. The control r.otor 19 and the main
motor 20 each have their own controller 21 and 22,
respectively. Control {speed-of-rotation control) is
carried-out in each case by means of a closed control loop,
a tachogenerator 23 being associated with the control
motor 19 and a tachogenerator 24 being associated with the
main motor 20. At the intake 3 of the drawing mechanism, a
variable proportional to the weight of the fibre slivers 5
fed in, for example their cross-section, is measured by an
intake measuring element 9 known, for example, from
DE-A- 44 04 326. At the exit 4 from the drawing mechanism,
the cross-section of the delivered fibre sliver 18 is
ascertained by an exit measuring element 25 associated with
the sliver funnel 17 and known, for exanple, from
DE-A- 195 37 933. A central computer unit 26 [control and
regulation device), for exanple a microcomputer with a
microprocessor, sends a setting for the desired value for
the control motor 19 to the controller 21. The measurement
values of the two measuring elements 9 and 25 are sent to
the central computer unit 26 during the drawing process.
The desired value for the control motor 19 is determined in
the central computer unit 26 from the measurement values of
the intake measuring element 9 and from the desired value
for the cross-section of the delivered fibre sliver 18. The
measurement vaiues of the exit measuring element 25 are
used for monitoring of the delivered fibre sliver 18
(delivered sliver monitoring). 3y means of this control
system, it is possible ror variations in tne cross-section
of the fibre slivers 5 fed in to be compensated, and for
the fibre sliver to be made more uniform, by appropriately
regulating the drafting process. Reference numeral 27
denotes a display monitor, 28 an interface, 29 an input
device, 30 a pressure rod and 31 a memory.
In accordance with Fig. 2, the trunnions Ia, Ha, IIIa
(see Fig. 3b) of the lower rollers I, II and III are
mounted so as to be capable of rotation in mountings 32a,
33a, 34a (32b, 33b, 34b are located on the other side of
the drawing mechanism and are not shown). The mountings 33a
and 34a are bolted onto sliders 35a and 36a, respectively,
which are displaceable in the direction of the arrows C, 0
and E, F, respectively, along a bar 37a. The two ends of
the bar 37a are fixedly counted in mounting blocks 38'
(38' not shown), which are attached to the frame 32 of the
machine.
Displacement cf the sliders 35a, 35b; 36a, 36b at the
same time causes the mountings 33a, 33b; 34a, 34b and, as a
result, the lower rollers II and III, respectively, to be
displaced and moved in airections C, D and E, F,
respectively. The associated upper rollers 13 and 14 are
correspondingly moved (in a manner not shown) in directions
C, D and E, F, respectively. 3y that means, the nip line
spacings between the roller combinations are modified and
set.
Locking of the sliders 35a, 35b; 36a, 36b is
accomplished by means of a catch device, stopping device or
the like (see Fig. 7) .
In accordance with Fig. 3a, the lower rollers II and
III are driven from the right-hand side, seen in the
direction of the direction of material flow A, by means of
a common loop mechanism in the form of toothed belt
wheels 40, 41 and a toothed belt 47. The different speeds
of rotation of the lower rollers II and II are achieved by
means of change-gearwheels at the drive trunnions IIa, IIIa
provided with different numbers of teeth. The toothed
belt 47 runs in direction B (that is to say contrary to the
work direction) onto the control drive, which is in the
form of a servo notcr 19. The lower roller I is driven from
the left-hand side of the machine by means of a loop
mechanism in the form of toothed belt wheels and a toothed
belt 47. For that purpose, the toothed belt 4 7 runs on the
left-hand side from the toothed belt disc 40' at the lower
roller I in direction G onto the servo motor 20.
In operation, that is to say when the fibre slivers are
running in direction m, the toothed belt 47 moves in
direction G. Starting from the toothed belt wheel 47
arranged on the drive motor 19, the toothed belt 47 runs
successively over e toothed belt wheel 45, a smooth guide
pulley wheel 4 6, the toothed belt wheel 40 (roller-driving
pulley wheel for the lower roller III), the toothed belt
wheel 41 (roller-driving pulley wheel for the lower
roller II), a smooth guide pulley wheel 42 and a toothed
belt wheel 43. 3y meens of its teeth, the toothed belt 47
is in positive engagement with the toothed belt v;heels 40,
41, 43, 4 4 and 45. The smooth side 47b (reverse) Fig.3c of the toothed
belt 47, opposite the toothed side, is in contact and in
engagement with the smooth guide puliey wheels 4 6 and 42.
The toothed belt 47 loops areur.d ail the pulley wheels 40
to 46. In operation (when the fibre slivers are running ir
direction A during drafting), the toothed belt wheels 40,
'41, 43, 44 and 45 rotate clockwise and the guide puliey
wheels 42 and 4 5 rotate anti-clockwise.
The toothed belt wheels 40, 41 are associated with the
mountings 34a end 33a, respe~tively, whereas the guide
pulley wheels 42, 46 are attached to the sliders 35a and
36a, respectively, in a renner allowing rotation. Because
of the rigid attachment between the mounting 34a and the
slider 36a and between the mounting 33a and the slider 35a
(fcr example, by ir.eans of bolts), there are associated With
the lower rollers II a/id III, in each case, one toothed
belt wheel 40 tc 41 and one guide pulley wheel 46 and. 42,
respectively. The toothed belt 47 runs around the pulley
wheels 40, 46, on the one hand, and around the pulley
wheels 41, 42, on the other hand, in a mirror-reflected
arrangement (see Fig. 3b).
The zone between the pairs of rollers 13/II and 14/III
is designated VV (preliminary drafting) and the zone
between the pairs of rollers 12/1 and 13/II is designated
HV (main draftings (see-Fig. 4a). When, in accordance with
Fig. 3a, the nip line spacing between the roller
pairs 14/III and 13/II is to be increased, at least one
pair of rollers must be moved away from the respective
other pair of rollers. For that purpose the slider 35a itay
be displaced towards the right, which may be accomplished
in two ways:
a) The slider 35a is unlocked. A pulley wheel, for
example the toothed belt wheel 44, is stopped so
that there is no possibility of rotation. Stopping
may be accomplished, for example, by nechar.ical or
electromagnetic means. As a result the toothed
belt 4 7 is stationary and cannot be moved. The
toothed belt wr.eel 41 is then rotated anti-
clockwise, for example manually using a crank or
the like, whereupon the guide pulley wheel 42
likewise rotates, clockwise, ss a matter of
necessity. In the process, the rotary movement of
the toothed belt whee] 41 is converted into a
longitudinal movement of the slider 35a in
direction C, the toothed belt wheel 41 and the
guide pulley wheel 42 winding along opposite sides
of the stationary toothed belt 47, thereby
"shortening", as it were, the toottied belt 47 at
one pulley wheel and "lengthening" it at the other
pulley wheel. The length of belt required during
that "winding along" at the toothed belt wheel 41
is made available at the guide pulley wheel 42.
The lower roller II is thereby displaced in
direction C by means of the slider 35a and the
mounting 33a.
b) The slider 35a is unlocked. The toothed belt
wheel 41 is scooped so that there is no
possibility of rotation. As a result the guide
pulley wheel 42 is also stopped of necessity.
Then, clockwise rotation is brought about by means
of the drive motor 19. The toothed belt 4 7 moves
in direction G, likewise "shortening" the belt 47
at one pulley wheel and "lengthening" it at the
other pulley wheel. The length of belt actually
required between the toothed belt wheels 4 0 and 41
is made available between the toothed belt
wheels 43 and pulley wheel 42. The rotary movement
of the toothed belt wheel 44 and the movement of
the toothed belt 47 is thereby converted into a
longitudinal movement of the slider 35a in
direction C. The lower roller II, mounted in the
mounting 33a (which is rigidly connected to the
slider 35a', is likewise moved in direction C as a
result.
In practice, it is often the case that, in accordance
with Figs. 4a to 4d, first the preliminary draft zone vv is
modified and then the main draft zone HV. In the case of
shortening of the draft zones W and HV, the slider 36a is
displaced in the direction of the arrow E fron the position
according to Fig. 4a into the position according to
Fig. 4b. As a result, the nip line spacing in the prelim-
inary draft zone W is reduced from "a" to "a"'. Then, in
accordance with Fig. 4c, the sliders 36a and 35a are
rigidly connected to one another by means of a bridge 50.
Finally, the rigidly coupled sliders 36a and 35a are moved,
in accordance with Fig. 4a, in the direction of the arrows
E and C, from the position shown in Fig. 4c into the
position shown in Fig. 4d. As a result, the nip line
spacing in the main draft zone KV is shortened from "b" to
"b"'. - A corresponding procedure is used in the case of
lengthening the preiininary and main draft zones, that is
to say the coupled sliders 35a and 36a are displaced in the
direction of the arrows F and D (see Fig. 2), as a result
of which the main draft zone HV is lengthened. Then, the
sliders 35a and 36a are uncoupled from the bridge 50.
Finally, the slider 36a is moved in the direction of the
arrow F (see Fig. 2), as a result of which the preliminary
draft zone V7 is lengthened.
With regard to the fibre slivers 5 in the drawing
mechanism 2, it should be noted that, in the case of
shortening of the draft zones VV and HV, a small- amount of
stretching, in direction B, c£ the fibre slivers 5IV
upstream of the pair of rollers 14/III can occur on
displacement in accordance with Figs. 4a, 4b, but because
of the length (about 1.5 m) of the spacing between the
transport rollers 7, 8 and the pair of rollers 14/III this
is without significance. In the case of shortening, a
sagging loop does rot fern in the preliminary draft zone VV
because in the case of displacement referring to the pairs
of rollers 14/III and 13/II either one or both pairs of
rollers are rotatable because the drives to both pairs of
rollers-are coupled by way of the toothed belt 47. In
contrast, ir. the case of shortening of the main draft
zone HV, a sagging loop is formed ir. fibre slivers 5',
which is drawn out or drawn straight by rotation of the
pair of rollers 12/I in the work direction A by means of
the main motor 20. - In the case of lengthening of the
draft zones VV and HV, the pair of rollers 12/I is, in a
first step, rotated backwards in direction B, whereupon a
sagging loop is intentionally formed in the fibre
slivers 5'. When the main draft zone HV is subsequently
lengthened by displacement of the coupled sliders 35a and
36a in direction D and E, the artificially formed loop is,
in the process, once again drawn out or drawn straight.
Finally, after uncoupling of the bridge 50, the slider 36a
is displaced in direction F. As a result of the above-
mentioned coupling of the drives to the intake and middle
Lower roller pairs by means of the toot.hed belt 47, the
length of the fibre slivers 5' in the preliminary draft
zone W rerr.ains unaffected. Possible slight compression of
the fibre slivers 5IV upstream of the pair of rollers
14/riI is, in respect of the drafting and the constitution
of the fibre slivers 5IV, without significance.
Figs. 5a, 5b show the construction bringing about the
displacement of the sliders 36a and 35a. The nip line
spacing in the preliminary draft zcr.e VV is lengthened from
"a" (Fig. 5a) to "a"" (Fig. 5b). The sliders 36a and 35a
are displaced one after the other according to the arrows S
and C, respectively. Displacement is accomplished by
stopping the toothed belt whe.el 4C or fixing it with a
holding brake or the liKe and then actuating the drive
motor 19, whereupon the toothed belt 47 moves. In
continuation thereof, the sliders 36a and 35a are displaced
in accordance with Figs. 4a, 4b and, subsequently,
Figs. 4c, 4c.
In accordance with Fig. 6a, an electromagnetic holding
brake is provided, which has a rod-shaped iron core 53
surrounded by a plunger coil 54. Counted on one end face of
the iron core 53 is a braKe shoe 55, for example nade of
plastics r.aterxai or the like. The iron core 53 is
displaceable in the direction of the arrows K, N. When
current flows through the plunger coil 54, the iron core 53
is moved in direction M, in accordance with Fig. 6b, so
that the brake shoe 55 is pressed against the smooth
cylindrical surface of the shaft 4 4a of the toothed belt
wheel 44. As e result, the toothed belt wheel 44 is fixed
(stopped) so that it cannot rotate, for as lcng as voltage
is applied to the plunger coil 54.
In accordance with Fig. 7, a pneumatic cylinder 60
having a piston rod 61 is attached to the slider 36a. When
subjected to pressure from the pneumatic cylinder 60, the
piston rod 61 is moved out in the direction of the arrow P
and comes to rest, with a high degree of contact pressure,
against the machine frame 61. The slider 36a is fixed
(stopped) so that it cannot be displaced with respect to
the bar 37a, for as lcng as compressed air is applied to
the pneumatic cyiir.dar 60.
In accordance with Fig. 8, there is provided, as the
bridge 50 between the sliders 35a and 36a, a flat piece of
metal (plate), which is fastened in the region of one of
its ends 50a to the slider 36a, for example using bolts. In
its region 50b facir^g the 3iider 35a, the flat piece of
metal has an elongate hole 50c, through which a bolt 62 can
engage in a threaded hole (not shown) in the slider 35a. Ey
means of this bridgt 50, the sliders 35a and 36a can be
rigidly connected to one another, reieasably, at different
spacir.ga with respect to one another,
In accordance with Fig. 9, in contrast to Fig. 1, each
lower roller I, II and III is driven by its own drive
motor 20, 52 and 19, respectively, as shown, for example,
in DE-OS 38 01 86 3. The motor 20 drives the toothed belt
wheel 55 of the lower roller I by way of the toothed
belt 56; the motor 52 drives the toothed belt wheel 41 of
the lower roller II by way of the toothed belt 57; and the
motor 19 drives the toothed belt wheel 40 of the lower
roller III by way of the toothed belt 47. Attached to the
slider 36a, in addition to the smooth guide pulley
wheel 4 6, is a further smooth guide pulley wheel 51. The
endless toothed balt 47 loops around, ir. succession, the
pulley wheels 44, 4 6, 4 0, 51 and 43. The toothed belt
wheels 44, 40 and 43 are in engagement with the teeth of
the toothed belt 47, whereas the smooth guide pulley
wheels 4 6 and 51 are in engagement with the smooth reverse
side of the toothed belt 47. The sliders 35a and 36a are
rigidly connected to one another, releasably, by means of
the bridge 50. When they are not connected by the
bridge 50, the sliders 35a and 36a are individually
displaceable and when they are connected by the bridge 50
they are jointly displaceable.
In accordance with Fig 10, the drive irotor 19 for
lower rollers II and III is in communication with the
electronic control and regulation device 26. Adjustment
values for modification of the draft zones VV ar.d KV (that
is to say the extents of the drawing zones) either can be
entered manually by way of the input device 29 ox: can be
called up from a memory 31 for particular categories of
fibre material.
Adjustment of the nip line spacing in the preliminary
draft zone VV and/or the main draft zone HV can be carried
out with the fibre slivers 5 inserted.
Displacement can be carried out with the upper rollers
11 to 14 in the loaded stare. Figs. 1 and 10 show inserted
fibre slivers 5 and loaded upper rollers 11 to 14. With the
fibre slivers inserted and the upper rollers 11 to 14
loaded, the sliders 35a, 36a or mountings of at least one
lower roller II, III are unlocked, the sliders or mountings
are set to the desired nip line spacing a, a'; b, b' by
means of a displacement device, for example in accordance
with Figs. 3a, 3b; 5a, 5£ and then the sliders 35a, 36a or
mountings are locked again (for example in accordance with
Fig. 7).
Displacement can also be carried out with the upper
rollers 11 to 14 lifted off. The upper rollers 11 to 14 may
be lifted off completely from the lower rollers I to III in
the manner shown in DE-OS 197 04 815, the upper roller 14
being swung out on a portal 58 about a pivot mounting 59.
However, it may also be sufficient for the upper rollers 11
to 14 to be unloaded and to be lifted off from the lower
rollers I to III only to a slight degree such that the
fibre slivers 5 are not caught by the pairs of rollers
during displacement of the draft zones W and HV but can
slide through the roller nip without being adversely
affected.
The invention has been illustrated using the example of the
adjustment of the nip line spacings of a drawing mechanism
of a draw frame. It likewise encompasses the adjustment of
drawing mechanisms of other machines, for example carding
machines, combing machines, fly frames and ring spinning
frames.
Claims
1. Apparatus at a draw frame having a drawing mechanism
for the doubling and drafting of fibre slivers, having a
drawing mechanism frame for accommodating the drawing
mechanism, which has at least two pairs of rollers each
comprising an upper roller and a lower roller, having means
for adjusting the spacirg of at least one of the lower
rollers in relation to another lower roller, in each case
having a mounting device for accommodating the lower
roller, wherein low«r rollers are arranged to be driven by
at least one drive element endlessly revolving arour.d
pulley wheels, characterised in that at least one guide
pulley wheel (42, 46, 51; is attached to each mounting
device (35a, 35b; 36a, 36b; 33a, 33b; 34a, 34b); and the
roller-driving pulley wheel (40, 41) and guide pulley wheel
(42, 4 6, 51) act, in eacn case one after the ether, on both
sides of the tensioned drive element (47).
2. Apparatus according to claim 1, characterised in that
at least one pulley wheel and the tensioned drive
element (47) are used for adjusting the mounting
device (35a, 35b; 36a. 36b/ 33a, 33b; 34a, 34b).
3. Apparatus according to clain 1 or 2, characterised in
that the drive element is stationary and the pulley wheel
is rotated.
4. Apparatus according to any one of claims 1 to 3,
characterised in that the pulley wheel is stationary and
the drive element is noved.
5. • Apparatus according to any one of claims 1 to 4,
characterised in that the rotation of the pulley wheel or
the movement of the drive element is converted into the
adjusting movement of the slider.
6. Apparatus according to any one of claims 1 to 5,
characterised in that the rotation of the pulley wheel or
the movement of the drive element is accomplished manually.
7. Apparatus according to any one of claims 1 to 5,
characterised in that the slider is linearly displaceabls.
8. Apparatus according to any one of claims 1 to 7,
characterised in that the drive element is a toothed belt.
9. Apparatus according to any one of claims 1 tc 8,
characterised in that an endless flexible toothed belt is
present.
10. Apparatus according to any one of elains 1 to 9,
characterised in that the pulley wheals comprise toothed
belt wheels.
11. Apparatus according to any one of claims 1 to 13,
characterised in that the pulley wheels comprise guide
pulley wheels.
12. Apparatus according to any one of claims 1 to 11,
characterised in that at least one driving pulley wheel is
provided.
13. Apparatus according to any one of claims 1 to 12,
characterised in that driver, pulley wheels are present.
14. Apparatus according to any one of claims 1 to 13,
characterised in that the drive element loops around the
pulley wheels.
15. Apparatus according to any one of claims 1 to 14,
characterised in that the drive element and the pulley
wheels are in engagement wich one another.
16. Apparatus according to any one of claims 1 to 15,
characterised in that the pulley wheel for adjustment of a
slider is the drive pulley wheel of a lower roller (roller-
driving pulley wheel).
17. Apparatus according to any one of claims 1 to 16,
characterised in that the slider is displaceable during
adjustment.
18. Apparatus according to any one of claims 1 to 17,
characterised in that the slider is arranged to be stopped.
19. Apparatus according to any one of claims 1 to 19,
characterised in that the stopping arrangement is
releasable.
20. Apparatus according to any one of claims 1 to 19,
characterised in that a display device for the position of
the slider is present
21. Apparatus according to any one of claims 1 to 20,
characterised in that a drive motor is used for rotation of
the pulley wheel.
22. Apparatus according to any one of claims 1 to 21,
characterised in that a drive motor is used for movement of
the drive element.
23.'Apparatus according to any one of claims 1 to 22,
characterised in that the drive motor is used for the lower
rollers.
24. Apparatus according to any or.e of claims 1 to 23,
characterised in that a separate drive motor is used.
25. Apparatus according to any one of claims 1 to 24,
characterised in that belt shortening or belt lengthening
is arranged to be automatically evened out during
adjustment.
26. Apparatus according to any one of claims 1 to 25,
characterised in that the evening-out of belt length is
carried cut at a slider by two guide pulley wheel3.
27. Apparatus according to any one of claims 1 to 26,
characterised in that the lower rollers are arranged to be
adjusted singly and independently of one another.
28. Apparatus according to any one of claims 1 to 27,
characterised in that a roller-driving pulley wheel and a
guide pulley wheel are attached to the slider of the intake
roller and a roller-driving pulley wheel and a guide pulley
wheel are attached to the slider of the middle roller.
29. Apparatus according to any one of claims 1 to 28,
characterised in that the drive element runs around the
pulley wheels at the slider of the intake roller and around
the pulley wheels at the slider of the middle roller in a
mirror-reflected arrangement.
30. Apparatus according to any one of claims 1 to 29,
characterised in that the drive element is in tension
before, during and after the displacement.
31. Apparatus according to any one of claims 1 to 30,
characterised in that the drive motor is in communication
with an electronic control and regulation device.
32. Apparatus according to any one of claims 1 to 31,
characterised in that a neasuring element is connected to
the control and regulation device.
33. Apparatus according to any one of claims 1 to 32,
characterised in that the measuring element is capable of
registering fibre-related and/or machinery-related
measurement variables.
34. Apparatus according to any one of claims 1 to 33,
characterised m that adjustment of the slider is carried
out when the draw frame is in operation.
35. Apparatus according to any one of claims 1 to 34,
characterised in that adjustment of the slider is carried
out when the draw frame is not in operation.
36. Apparatus according to any one of claims 1 to 35,
characterised in that adjustment of the slider is carried
out during can-changing.
37. Apparatus according to any one of claims 1 to 36,
characterised in that the draw frame is self-adjusting.
38. Apparatus according to any one of claims 1 to 31,
characterised in that adjustment of the slider is carried
out by inputting adjustment variables.
39. Apparatus according to any one of claims 1 to 38,
characterised in that the adjustment variables can be input
manually.
40. Apparatus according to any one of claiir.s 1 to 39,
characterised ir. that a memory for adjustment variables is
connected to the control and regulation device.
41. Apparatus according to any one of claims 1 to 40,
characterised in that the slider for the intake roller and
the slider for the middle roller are arranged to be
connected by a rigid connecting element.
42. Apparatus according to any one of claims 1 to 41,
characterised in that the connecting element is releasably
connected.
43. Apparatus according to any one of claims 1 to 42,
characterised in that the spacing of the pairs of rollers
in relation tc one another can be adjusted without fibre
material being present.
44. Apparatus according to any one of claims 1 to 43,
characterised in that the spacing of the pairs of rollers
in relation to one another can be adjusted with fibre
material being present.
45. Apparatus according to any one of claims 1 to 44,
characterised in that the extent of the preliminary draft
zone can be adjusted.
46. Apparatus according to any one of claims 1 to 45,
characterised in that ths extent of the main draft rone can
be adjusted.
47. Apparatus according to any one of claims 1 to 46,
characterised in that the extent cf the preliminary draft
zone and the extent ot the main draft zone can be adjusted.
48. Apparatus according to any one of claims 1 to 47,
characterised in that each lower roller has its own
associated drive motor.
49. Apparatus according to any one of claims 1 to 48,
characterised in that the intake and middle lower rollers
are arranged to be driven by one drive motor.
50. Apparatus according to any one of claims 1 to 4 5,
characterised in that a brake, stopping arrangement or the
like is associated with tne stationary pulley wheel.
51. Apparatus according to any one of claims 1 to 5C,
characterised in that a mechanical brake, stopping
arrangement or tne like is present.
52. Apparatus according to any one of claims 1 tc 51,
characterised in that an electrical brake, stopping
arrangement or the like is present.
53. Apparatus according to any one of claims 1 to 52,
characterised in that the drive motor is a self-braking
motor.
54. Apparatus according to any one of claims 1 to 53,
characterised in that an electromagnetic brake, stopping
arrangement or the like is present.
55. Apparatus according to any one of claims 1 to 54,
characterised in that the drive motor drives a further
drive train, which has a free-wheel arrangement or the
like.
56. Apparatus according to any one of claims 1 to 55,
characterised in that the mounting device consists of the
mounting (33a, 33b; 34a, 34b) and the slider !35a, 35b,
36a, 36b).
57. Apparatus according to any one of claims I to 56,
characterised in that the mounting ;33a, 33b, 3
the slider (35a, 3bb, 36a, 36b) are fastened to one
another, for example by bolts.
58. Apparatus according to any one of claims 1 to 57,
characterised in that the mounting (33a, 33b, 34, 34b) ar.d
the slider (35a, 35b, 36a, 36b) are of integral
construction.
Apparatus at a draw frame having a drawing mechanism for
the doubling and drafting of fibre slivers, having a
drawing mechanism frame for accommodating the drawing
mechanism, which has at least two pairs of rollers each
comprising an upper roller and a lower roller, having means
for adjusting the spacing of at least one of the lower
rollers in relation to another lower roller, in each case
having a mounting device for accommodating the lower
roller, lower rollers are arranged to be driven by at least
one drive element endJessly revolving around pulley wheels
and each lower roller has a roller-driving pulley wheel.
In order, by simple means in terms of construction, to
make possible a considerable reduction in the work and time
required for adjustment of the slider(s) and, accordingly,
of the extent (s) of the drawing zone(s) without re-
tensioning of the drive belt after the adjustment, at least
one guide pulley wheel is attached to each mounting device,
and the roller-driving pulley wheel or guide pulloy wheel
act, in each case one after the other, on both sides of the
tensioned drive element.
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