EP0425803B1 - Apparatus for delivering fibre slivers to a textile processing machine - Google Patents

Description

The invention relates to a device for feeding slivers - or the like in particular from cans. Stacking vessels are weighed - via conveying devices of an infeed table to a textile processing machine, with the conveying path of the sliver being assigned a reserve belt in a standby position, which can be switched on via a control device in the event of breakage or running out of the sliver so that the beginning of the reserve association comes to the end of the leaking sliver is attached.

Devices are known from practice in which the individual fiber slivers are drawn from spinning cans via pairs of rollers arranged above them and fed to a subsequent textile processing machine, for example a draw frame, via several support rollers or other guide aids. There, the slivers are combined to form a fleece and fed to the drafting system by means of a pair of rollers.

According to DE-AS 22 30 644, the sliver to be processed is drawn from the spinning can via take-off rollers and placed on a conveyor belt for further transport. Each so-called working jug is assigned in pairs a so-called reserve jug, the sliver of which is taken up as a reserve sliver via a pair of take-off rollers and kept ready. The pairs of take-off rolls of the fiber sliver and the reserve sliver are - seen in the conveying direction - arranged one behind the other in a line.

If a sliver fails, the take-off device of the assigned reserve sliver is started by a control. This ensures the automatic tracking of a reserve bandage if a sliver breaks or runs out.

A lack of such designs is that the connection of the tape ends remains imperfect, especially if the tape ends do not run exactly linear. This considerably limits the possibilities of assigning infeed tables.

Devices are also known from GB-PS 968 045 and GB-PS 1 540 491, in which fiber slivers running out via corresponding devices are replaced by standby belts that are ready. These devices are sometimes complex and do not allow an exact and quick attachment to the respective sliver.

In view of this, the inventor set himself the task of avoiding the existing disadvantages of known devices, improving the merging of belt ends at any angle between the feed and discharge directions, and the controlled tracking of a reserve belt. In addition, the reliable infeed table should be manufactured and maintained in a particularly simple manner.

This object is achieved by a device, the separately designed conveying paths of the sliver and reserve belt being assigned a common pressure gap, the sliver and the beginning of the reserve belt being able to be fed to the pressure gap lying next to one another. In addition, the pressure nip should be designed as a roller nip delimited by rollers, which are arranged on roller axes running approximately vertically to the conveying path of the sliver. These measures ensure that the sliver ends are optimally brought together.

According to a further feature of the invention, one of the rollers is a reversal for a rotating belt conveyor which overlaps the conveying paths of the sliver and the associated reserve belt at an approximately horizontal setting angle. One of the rollers can rest against the strand of the belt conveyor pointing against the conveying direction as a pressure roller.

Advantageously, a plurality of pairs of rollers are arranged side by side and their nips are spaced apart in the conveying direction. The axes of the pressure rollers can also be at a distance from one another in the running direction.

Of particular importance are lateral guides arranged upstream of the roll gap, which form a funnel-shaped surface that covers both conveying paths.

The invention allows a free band end to be deflected at any angle and the band end to be attached during this deflection; the accelerated reserve belt fed through the infeed table is pressed together with the outgoing belt by the pressure force of the pressure rollers on the conveyor belt. The angle between the inlet and outlet can be freely selected. Above all, by using the tangential deflection conveyor, it is possible to dispense the belt in all directions or to swap the outgoing end and reserve belt.

It is within the scope of the solution of the task that the conveying devices or conveying paths of the infeed table consist of individual guide elements, in particular conveyor belts assigned to each sliver and each reserve belt and drivable individually or in groups, in particular conveyor belts, which are connected at an angle to at least one conveying transport element.

For easy tracking of the reserve belts, the conveyor belts for the fiber belts and the reserve belts should be arranged parallel to one another and in pairs. It has also proven to be advantageous to connect these conveyor belts, which are combined in pairs, to one another in terms of control.

By using individual conveyor belts, it is possible to design the lengths of the conveyor belts so that they do not exceed the necessary dimensions; you can start the respective conveyor belt above the assigned spinning can and end it at a common delivery point. Staggered band starts are offered above the spinning cans in rows.

The conveyor belt mass to be moved is limited to a necessary minimum, resulting in lower drive power and less dust.

The proposal to design the deflection rollers of the conveyor belts at the inlet by interacting with swiveling pressure rollers as a pull-off device for the fiber belts results in a compact arrangement, the fiber belts being guided directly on the conveyor belt for further transport without a large deflection.

The concept according to the invention of accommodating the individual conveyor belts in each case on a separate frame part or carrier is of particular and independently protected importance; the frame of the infeed table should be able to be assembled from modules according to the respective requirements.

For this purpose, it has proven to be advantageous that the individual carrier has a drive roller at one end and a deflection roller at the other end, the latter - but also the drive roller - preferably being axially movable on the carrier as a tension roller for the conveyor belt.

The carrier can be made from a tubular profile and a U-profile can be placed on it; the upper run of the conveyor belt is stored in its profile space and can be moved in a protected manner.

For the other strand of the conveyor belt, a tube or channel attachment is provided below the tube profile, and at least one support roller in this, in order to prevent sagging. The support roller can also be present outside the channel insert in a cross member holding the carrier; Several parallel beams are gripped by at least one common cross beam as part of the frame of the infeed table, so that this frame needs only a few individual parts.

It is particularly important that the carrier can be composed of axial carrier sections that are spanned by the conveyor belt; these carrier sections are prefabricated in a predetermined grid dimension with different lengths, preferably a basic basis and one and a half times and twice its size should be present.

According to a further example of the invention, the drive of the conveyor belt is provided in a drive unit attached to the carrier as a module, which also contains the drive roller engaging in the loop of the endless conveyor belt. To improve the retraction of the fiber sliver, at least one pressure roller can be swiveled on its circumference, which in turn is part of the drive unit or else is articulated outside the drive unit to its support or to the adjacent support - the latter across the conveying direction.

Fig. 1:

die schematisierte Draufsicht auf einen bekannten Einlauftisch einer Textilmaschine;

Fig. 2:

die Seitenansicht zu Fig. 1;

Fig. 3:

die gegenüber Fig. 1 vergrößerte Draufsicht auf einen Übergabebereich des Einlauftisches;

Fig. 4:

die Draufsicht auf eine andere bekannte Ausführung des Übergabebereiches;

Fig. 5

die schematische Draufsicht auf einen erfindungsgemäßen Einlauftisch einer Textilmaschine.

Fig. 6 und Fig. 7:

andere Ausführungsbeispiele zur Ausgestaltung von Übergabebereichen des Einlauftisches;

Fig. 8:

die Draufischt auf ein weiteres Ausführungsbeispiel eines Einlauftisches;

Fig. 9:

die verkleinerte Seitenansicht zu Fig. 8;

Fig. 10

einen vergrösserten Ausschnitt aus Fig. 9;

Fig. 11:

die Draufsicht auf den Ausschnitt der Fig. 10.

Fig. 12:

Ein Schnitt gemäss Fig. 8 in Teilansicht.

Further advantages, features and details of the invention emerge from the following description of preferred exemplary embodiments and with reference to the drawing; this shows in

Fig. 1:

the schematic plan view of a known inlet table of a textile machine;

Fig. 2:

the side view of Fig. 1;

Fig. 3:

the enlarged plan view of a transfer area of the inlet table compared to FIG. 1;

Fig. 4:

the top view of another known embodiment of the transfer area;

Fig. 5

the schematic plan view of an inlet table of a textile machine according to the invention.

6 and 7:

other embodiments for the design of transfer areas of the inlet table;

Fig. 8:

the top fish on a further embodiment of an inlet table;

Fig. 9:

the reduced side view of Fig. 8;

Fig. 10

an enlarged section of Fig. 9;

Fig. 11:

the top view of the detail of FIG. 10th

Fig. 12:

A section according to FIG. 8 in partial view.

An infeed table 10 of a textile machine for the treatment of slivers 12 is arranged above so-called cans 14, from which the slivers 12 are guided onto the infeed table 10 by means of rollers 16. Alternatively, with the cans 14 reserve cans 14 _a are arranged, from which reserve slivers are guided to _a run-in table 10 12th The in the conveying direction x front end 12 _{e of} the reserve tapes 12 _a are attached to the rear end 12 _{i of} an adjacent sliver 12 to avoid interruptions in the tape feeds.

The individual fiber belts 12 and the reserve belts 12 _a arrive on separate conveyor belts 18 and 18 _a , which - as can be seen for example in FIG. 1 - are of a staggered length and are attached to a dispensing head 20 with their end ends. In Fig. 3 at 19 lateral guides are indicated, which flank the belts 12, 12 _a over the entire length of the conveyor belts 18, 18 _a or parts thereof.

In the area of the dispensing head 20 there is also a drive roller 23 coupled to a drive 22 for the conveyor belts 18, 18 _a . It is not shown that the conveyor belts 18 and 18 _{a can} each be driven separately or in groups via the drive roller 23. Clutches and braking devices (not shown) are assigned to the drive roller 23 and connected to a control unit 24.

In the conveying direction x in front of the drive roller 23, two sensor holders 26, 28 for sensors 27, 29 - which scan the slivers 12, 12 _a running beneath it - are attached in parallel.

The delivery head 20 formed by the drive roller 23 and the deflected conveyor belts 18, 18 _a is gripped by a relatively short conveyor belt 32 common to the conveyor belts 18, 18 _a , the width of which corresponds at least to the width of the delivery head 20. Above the upper run 32 _{h of} the conveyor belt 32, two mutually inclined flank guides 34 are attached in such a way that they grip the external fiber belts 12 and deflect them to a conveyor roller 39 - which forms a nip 37 with the rear reversing roller 33 of the conveyor belt 32.

Within the funnel-like surfaces delimited by that flank guide 34, intermediate guides 36 are in turn provided inclined to the longitudinal axis A of the conveyor. Each of the guide members 34, 36 is assigned a fiber sliver 12 with an adjacent reserve sliver 12 _a . The fiber tapes 12 in FIGS. 3, 4 are guided through the guide members 34, 36 to the roller nip 37 and brought together in the area of a stretch 40 to form a nonwoven fabric 42.

In the exemplary embodiment in FIG. 4, two infeed tables 10 for two slivers 12 and two reserve belts 12 _{a are set} at setting angles w, w 1 to the longitudinal axis A of the conveyor and abut a central guide 35 in the area of the dispensing head 20.

In order to be able to set any entry angle t - even below 90 ° - between the incoming conveying direction x and the outgoing direction y and still be able to guarantee good operational reliability when merging the fiber slivers 12 and their reserve belts 12 _a at inlet speeds of 150 to 200 m / min 5 in the transfer area 20 _{a arranged} on a straight line G two tape rolls 44, 44 _a directed perpendicular to the upper run 34 _h . This straight line G includes the longitudinal axis of conveyance A - in the exemplary embodiment shown at an entry angle t of 90 ° - an angle of incidence t 1 of 130 ° to 140 °.

A placed around the two belt rolls 44, 44 _a, for example with 2,600 rpm rotating belt conveyor 46 affects the conveyor belt 18 in that setting angle t 1 and takes the fiber belt 12 into a roller gap 47, which is limited by the belt conveyor 46 and a lateral pressure roller 48. A conveyor belt 50 for the running sliver 12 _z adjoins the roller gap 47 in the direction of the y.

If the rear end 12 _{i of} the sliver 12 approaches the deflection belt conveyor 46, the reserve belt 12 _{a is} fed to the nip 47 and its free end 12 _{e is} pressed together with the outgoing sliver 12 by the pressing force of the pressure roller 48. This connection point 12 _i / 12 _e receives sufficient strength to the like or the like sliver 12 _z in a drafting system. to be able to introduce. It is of no importance whether the conveyor belt 18 for the sliver 12 or the conveyor belt 18 _a for the reserve belt 12 _{a is} closer to the pressure roller 48.

Both the distances e of the band rollers 44, 44a of deflecting devices assigned to one another in the direction of the discharge y and the distances q of the nips 47 directed transversely thereto can be changed in accordance with FIG. 6.

In a further embodiment, the nips 47 are formed by the rollers 44, 48 without the interposition of a deflection belt conveyor. The short clamping path leads here to less adhesion of the reserve belt 12 _{a to} the fiber belt 12.

Figs. 8 to 11 provide details of another embodiment of the run-in table 10 with its separated from each other over separate deflecting rollers 30 run, as well as in the conveying direction x by individual drive rollers 23 _a moving conveyor belts 18, 18 _a an exemplary width of 40 mm again.

In contrast to FIG. 1, the drive roller 23 _a is not provided at the transfer point 11 near the motor 12, but rather is part of a modular drive unit 25, in which a separate drive is integrated. This drive unit 35 sits at the feed end 11 of an iw horizontal support 38, which is assembled from a plurality of support sections 38 _a , 38 _b , 38 _c ; 8 are used, for example, in three different lengths n 1, n 2, n 3 in order to be able to produce as many different total lengths n as possible for the carrier 38. The length n₁ of the support section 38 corresponds to half the length n₃ of the support section 38 _c , the length n₂ of the support section 38 _b of one and a half times the length n₁.

The beams 38 composed of those beam sections 38 _a , 38 _b , 38 _c in staggered overall lengths n rest on common cross beams 52, which in turn are connected to vertical supports 54.

Each carrier 38 forms with its drive unit 25 and the deflection roller 30 attached at the other end an exchange unit and is part of a frame 56 of the inlet table 10 with the cross members 52 and the vertical supports 54 - the foot regions of which are neglected in the drawing.

The lower run 18 _t of between deflection roller 30 and drive roller 23 _a spanned conveyor belt 18 or 18 _a is located on support rollers 31 which prevent slack.

The carrier 38 or the carrier sections 38 _a , 38 _b , 38 _c have, according to FIG. 12, a supporting tube profile 58, under which a tube or channel attachment 60 receiving those support rollers 31 is riveted or screwed. On the tubular profile 58 there is a U-profile 62, the profile legs 64 of which flank the upper run 18 _{h of} the conveyor belt 18, 18 _a running in the profile space 66 and protect the overlying sliver 12 as well as the channel attachment 60 the lower run 18 _t .

The drive unit 25 is attached to the feed end 11 of a tubular profile 58. On the circumference of its drive roller 23 _a - or a casserole end there sliver 12 - a pressure roller is on-hook 68 and is hinged by means of a rocker arm on a bracket of the adjacent carrier 38th A sensor integrated in the drive unit 25 or arranged in the feed area in another way controls the belt movement as a function of the passage of the sliver 12.

To change the conveyor belt 18, 18 _a , the carrier 38 is lifted from its cross members 40 and the portable deflection roller 30, which serves as a tensioning roller, is released. After applying a new conveyor belt 18 or 18 _a , this is tensioned by the deflection roller 30, and the carrier 38 is used again.

Claims (16)

1. An apparatus for supplying slivers (12) which are drawn off from cans (14, 14a) or similar stacking devices, in particular, through conveying devices (18, 18a) of a feed table (10) to a textile-processing machine (40), with the conveying path of the respective sliver (12) being provided with a reserve sliver (12a) in a standby position, which reserve sliver can be switched on via a control unit in the event of breakage or running out of the sliver in such a way that the initial part (12e) of the reserve sliver can be joined to the end (12i) of the sliver running out, characterized in that the separate conveying paths of the conveying devices (18, 18a) of the sliver (12) and the reserve sliver (12a) are provided with a joint pressure gap (47) extending approximately vertical to the conveying path of the sliver and that the sliver as well as the initial part of the reserve sliver can be fed to the pressure gap adjacent to one another in a plane of the feed table.
2. An apparatus as claimed in claim 1, characterized in that the pressure gap (47) is formed by rolls (44, 48) disposed adjacent to one another with roll axes extending substantially vertical to the conveying path (18) of the sliver (12).
3. An apparatus as claimed in claim 1 or 2, characterized in that one of the rolls (44) is a reversor for a rotating belt conveyor (46) which overlaps the conveying paths (18, 18a) of the sliver (12) and the allocated reserve sliver (12) at a substantially horizontal setting angle (t, t₁).
4. An apparatus as claimed in claim 2 or 3, characterized in that the one of the rolls (48) sits close as a pressure roll to the strand of the belt conveyor (46) averted from the conveying direction (x).
5. An apparatus as claimed in one of the claims 1 to 4, characterized in that several pairs of rolls (44, 48) are arranged adjacent to one another and that their roll gap (47) in the conveying direction (x) is provided at a distance (q) from one another.
6. An apparatus as claimed in one of the claims 1 to 5, characterized in that several pairs of rolls (44, 48) are arranged adjacent to one another and that the axles of the pressure rolls (48) in the delivery direction (y) are disposed at a distance (e) from one another.
7. An apparatus as claimed at least in one of the claims 1 to 6, characterized in that the roll gap (47) is provided with lateral guiding means (36) which form a funnel-like surface encompassing the two conveying paths (18, 18a).
8. An apparatus as claimed in claims 3 and 7, characterized in that the guiding means (36) end in the belt conveyor (46).
9. An apparatus as claimed at least in one of the claims 1 to 8, characterized in that the conveying devices or conveying paths of the feed table (10) consist of individual guiding members, in particular conveyor belts (18, 18a), which are allocated to each sliver (12) and each reserve sliver (12a) and are drivable individually or in groups and are disposed in front of at least one discharging conveyor element (50) at an angle (w).
10. An apparatus as claimed at least in one of the claims 1 to 9, characterized in that the conveyor belts (18, 18a) for the slivers (12) and the reserve slivers (12a) are arranged parallel and in pairs with respect to one another.
11. An apparatus as claimed at least in one of the claims 1 to 10, characterized in that each conveyor belt (18, 18a) is attached to a separate carrier (38) which is provided at the one end with a drive roll (23a) and at the other end with a guide roll (30), with the drive roll and/or the guide roll being preferably axially movable on the carrier as a tension roller.
12. An apparatus as claimed in claim 11, characterized in that the carrier (38) consists of a pipe profile (58) and a U-profile (62) placed thereon, in whose profile chamber (66) a strand (18h) of the conveyor belt (18, 18a) is arranged, with a pipe or conduit socket (60) and/or at least one supporting roll being provided below the pipe profile for the other strand (18t) of the conveyor belt.
13. An apparatus as claimed in claim 11 or 12, characterized in that the carrier (38) is composed of axial carrier sections (38a to 38c) which are jointly covered by the conveyor belt (18, 18a), with the lengths (n1 or n3) of the carrier sections (38b or 38c) being one and a half times or a multiple of the length (n1) of a carrier section unit (38a).
14. An apparatus as claimed at least in one of the claims 11 to 13, characterized in that several parallel carriers (38) are held by at least one joint crossbeam (40) as a part of the frame (56) of the feed table (10).
15. An apparatus as claimed at least in one of the claims 1 to 14, characterized in that the drive of the conveyor belt (18, 18a) is provided in a drive unit (25) attached to the carrier (38) as a module, which unit contains the drive roller (23a) engaging in the loop of the conveyor belt.
16. An apparatus as claimed at least in one of the claims 1 to 15, characterized in that at least one pressure roller (68) is swivellable onto the circumference of the drive roller (23a), which pressure roller is a part of the drive unit (25) or which is articulated outside of the drive unit on its carrier (38) or on the latter adjacent carrier (38) overlapping in the conveying direction (x).

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