EP1700937A2 - Device for removing dirt from a spinning preparatory machine comprising a drafting device - Google Patents

Abstract

In apparatus for removing dirt from a spinning mill preparatory machine with a stretching tool (4) having upper and lower rollers (5a/b, 6a/b, 7a/b, 9), comprising elongated stripper(s) (41, 42, 43) lying on the rollers to collect dirt and a dirt suction device (30, 51, 52, 55) near the stripper(s), an electronically controlled device (60) lifts the stripper(s) from the roller(s), releasing dirt on the stripper(s) and/or roller(s) to be sucked up.

Description

The present invention relates to a device on a spinning preparation machine, in particular a carding machine, track, combing machine or the like, according to the preamble of claim 1.

In known drafting systems, in particular those of regulated and unregulated routes, roller pairs are arranged, each consisting of a top and bottom roller, between which the material is guided. Today usually used drafting systems of routes are in particular so-called 4-over-3 drafting systems, in which three pairs of rollers are connected in series and a further top roller is arranged downstream, which is also referred to as Umlenkoberwalze. In addition to fibers of the desired staple length, short fibers and dirt are also present in the fiber material. The dirt is solid particles of cotton, such as shell parts, dust or foreign particles, but also avivage. This dirt, including unwanted fibers accumulates on the outer surface of the roller. In this case, it can be particularly easy to form a lap on the roller, which can eventually lead to a fiber material jam. But even without winding formation is affected by dirt on the roll surface, the clamping of the fiber material to the respective pair of rollers.

To remove this dirt on lower rollers usually cleaning lips are arranged, which are fixed at an angle to the lateral surface of the roller, that the wiping edge of the lip parallel to the longitudinal axis the roller is guided and bent under bending stress in the roll rotation direction is applied to the roll surface. During the rotation of the roller scrapes the stationary cleaning lip settling dirt from the lateral surface of the roller. The dirt then falls off the cleaning lip and is detected by an air flow, which is directed obliquely and substantially against the sliver running direction, and transported away. Such a cleaning lip is for example in the EP 0 853 147 B1 disclosed.

A stripping device for top rollers is for example from the
DE 102 07 255 A1 The applicant is known in which a top roller Abstreifeinrichtung in the form of a cleaning lip has an elastic support portion or braking portion, the fiber material brakes, which then creeps over under the support portion on the other side of the section and is sucked off there by a suction device. However, it has been found in this device that not all of the dirt dissolves from the cleaning lip, but clamps in the wedge-shaped section between stripping and the lateral surface of the top roller.

It is an object of the present invention to develop a device of the type mentioned in such a way that an effective dirt removal is realized from the drafting system.

This object is achieved in the device of the type mentioned by the features of claim 1.

The advantages of the invention are particularly to be seen in that can be solved by the repeated lifting of the entire stripping over the entire width of the now accumulated dirt from the deadlock between stripping and roller, to then be sucked through the suction. By lifting the invention decreases the adhesion of the dirt lumps on the stripping and / or the associated roller, so that the suction device can provide for effective removal of the dirt.

The invention can be used both in stripping devices for top rollers and bottom rollers to effectively remove dirt.

Advantageously, the at least one stripping device - as in DE 102 07 255 A1 described - designed as a cleaning lip with an elastic support portion. This is preferably from above or below on the upper roller or the lower roller and points in the direction of the drafting input. The cleaning lip is hereby aligned in the direction of rotation of the respective top or bottom roller. This embodiment enables effective collection of the dirt in the collecting gap between support section and roller. In conjunction with the repeated lifting of the cleaning lip according to the invention dirt can thus be removed in two ways. On the one hand, this is the dirt removal, as in the DE 102 07 255 A1 was described for top rollers. Here, at least a part of the dirt creeps under the elastic support section and is there detected by an air flow, preferably a suction air flow. The other part of the dirt, which deposits in the collecting gap and does not lift the support section of the stripping device locally and does not reach the other side of the support section, is loosened by the lifting off of the entire stripping device and can then be sucked off.

The stripping device can be lifted directly from the roller according to an advantageous embodiment, for example by means of a space-saving electromagnet, which is part of the electronically controlled lifting device and engages upon activation, for example, to a metallic portion or front metal ends of the stripping and this example, against a spring force of the Roller, for example, a lower roller, lifts.

Preferably, the at least one stripping device can be lifted and lowered again together with at least one of the suction channels of the suction device. By lifting off at least part of the suction device and the at least one stripping device can be raised. With this construction, the lift-off device does not have to engage directly on the stripping device, which could lead to problems with the spatial placement of this device.

Preferably, the at least one stripping device or cleaning lip is connected to at least one suction channel wall of the suction device.

A related preferred embodiment provides that the at least one stripping device is rearwardly, i. with its longitudinal side facing away from the roller, connected to a suction channel wall of the suction device. Here, the rear end of the stripping device is non-positively connected to the corresponding wall of the suction channel, for example by a screw or clamp. According to an advantageous embodiment, in this case the stripping device or the cleaning lip is aligned with the corresponding channel wall in order to ensure an optimal air flow.

Alternatively or additionally, the two end faces of the at least one stripping device are fastened to preferably vertically extending side walls of a suction channel. Again, it is advantageous if the stripping device backward connects to a preferably parallel running Saugkanalwand to prevent flow losses.

Particularly preferably, a first suction channel is provided on one side of the at least one stripping device and a second suction channel is provided on the other side of the stripping device. Dirt, which creeps between the stripper and the roller, can thus from the first Suction channel are removed, wherein the second suction preferably carries away the loosened by the inventive lifting of the entire wiper dirt. However, it is also possible that after lifting the entire stripping of the loosened dirt due to the rotation of the roller still gets into the suction region of the first suction and transported away from this.

According to an advantageous embodiment, the various suction channels are integrated in a single or multi-part suction hood (or suction head), which can be pivoted away from the drafting system for better accessibility for an operator. This pivotability can be utilized simultaneously to realize the above-described periodic lifting with subsequent lowering of the suction hood together with the at least one stripping device. In this case, the lifting device for lifting the scraper attack on the suction hood and this pivot about the said pivot axis up, wherein the at least one scraper mitaufhoben (and then lowered again) is.

For the aforementioned purpose, preferably at least one electrically controlled electromagnet or pneumatic cylinder is provided, which is fastened to the said suction hood or one of the suction hood opposite immovable machine part and accordingly engages the said machine part or the suction hood to lift the suction hood. It has proved to be advantageous in this case if the pneumatic cylinder is arranged on the base plate of the drafting system and acts on a lower edge of a side wall of the suction hood to lift it and then lower it again.

The electronic control preferably comprises a time relay with which said at least one solenoid or pneumatic cylinder with the aid of a microcomputer, preferably with a central computer of the Spinning preparation machine is connected or integrated in this is driven. Such lifting with the aid of the electronically controlled time relay is preferably carried out before a can change. Alternatively or additionally, the lift-off device is activated during production in the high-speed spinning preparation machine.

As can be seen from the above, the lifting device can lift off and lower a single wiper or cleaning lip, engage several wiper devices at the same time, or indirectly lift a machine part to which one or more wipers are attached. It is also conceivable that the lifting device several stripping devices successively and / or independently lifts and lowers again.

It has proven to be advantageous if the lift-off time is just before a can change between one and twenty seconds. The lift-off time during the sliver-producing high-speed is preferably between one and ten seconds. After the lifting time, the stripping device is lowered back to the top roller. It has also been found to be favorable if the time between two lifting operations of the stripping device is between 30 and 300 seconds. The experiments have also shown that the Abhebeweg .DELTA.s for the stripping device is preferably between 10 and 20 mm.

A preferred embodiment of the invention provides that in each case a stripping device is provided at least on the Ausgangsoberwalze and / or the Umlenkoberwalze. These rollers have a higher peripheral speed than the upstream upper input and center rollers. Therefore, the temperature of the roll cover of the output upper roll and the Umlenkoberwalze is higher than that of the upstream upper rolls, which is why light dirt or the like settles on the roll surface.

According to an aspect of the invention, the suction channels are preferably designed to be adjustable in length, so that when changing the stretching field widths, i. the distances of the roller pairs from each other, the suction channels are accordingly readjusted. With an arrangement of the at least one stripping device on a suction channel wall, the stripping device (s) is again adjusted exactly in relation to the corresponding upper rollers during a length adjustment of the corresponding suction channel. This results in the double effect that not only always the at least one stripping device can be arranged in an optimal position to the corresponding top roller, but the suction channels are also optimally adjusted to the drafting zone area to be sucked.

In a corresponding preferred embodiment, the suction hood is formed at least in two parts, wherein at least one hood part moves relative to the other, for example, moved, can be. For this purpose, the movable hood part according to an advantageous embodiment, at least one slot through which a screw is inserted, which is also guided by a corresponding opening of the fixed hood part.

Advantageous developments are characterized by the features of the subclaims.

Figur 1

eine Strecke in schematischer Seitenansicht;

Figur 2

eine schematische Seitenansicht des Streckwerks der Figur 1;

Figur 2a

eine schematische Draufsicht auf den Absaugkopf des Streckwerks der Figur 2;

Figur 3

eine Oberwalze mit einer Abstreifeinrichtung in Seitenansicht;

Figur 4

die Anordnung gemäß der Figur 3 mit abgehobener Abstreifeinrichtung;

Figur 5

eine Oberwalze mit einer Abstreifeinrichtung mit einem elastischen Auflageabschnitt;

Figur 6

die Anordnung gemäß der Figur 5 bei Abtransport von Schmutz;

Figur 7

die Oberwalzen eines Streckwerks mit zweigeteilter Absaughaube;

Figur 7a

die zweiteilige Absaughaube der Figur 7 in schematischer Draufsicht;

Figur 8

ein Streckwerk mit an den Unterwalzen anliegenden Abstreifeinrichtungen, und

Figur 9

das Streckwerk der Figur 8 mit von den Unterwalzen abgehobenen Abstreifeinrichtungen.

In the following the invention will be explained in more detail with reference to FIGS. Show it:

FIG. 1

a route in a schematic side view;

FIG. 2

a schematic side view of the drafting system of Figure 1;

FIG. 2a

a schematic plan view of the suction head of the drafting system of Figure 2;

FIG. 3

a top roller with a stripping device in side view;

FIG. 4

the arrangement of Figure 3 with lifted Abstreifeinrichtung;

FIG. 5

a top roll having a scraping device with an elastic support portion;

FIG. 6

the arrangement according to the figure 5 at removal of dirt;

FIG. 7

the upper rollers of a drafting system with a two-part extraction hood;

Figure 7a

the two-piece extraction hood of Figure 7 in a schematic plan view;

FIG. 8

a drafting with voltage applied to the lower rollers stripping, and

FIG. 9

the drafting of Figure 8 with lifted off from the lower rollers stripping.

Schematically, a route is shown in Figure 1 in side view as an example of a spinning preparation machine. Here are several, essentially untwisted fiber slivers FB (only these are shown here from above) presented the route side by side. It is also possible to supply the track only a sliver FB, which is presented by an upstream carding or combing machine directly to the track. At the entrance The path is a funnel 12 is arranged, which compresses the slivers FB. Alternatively, other compressors may be used. After passing through a scanning device 2, 3 as part of an inlet sensor, the now compressed sliver FB ', which consists of the several individual slivers FB, led into a drafting system 4, which forms the core of the route. In the present case, the drafting device 4 has three drafting elements or pairs of rollers, between which the actual distortion takes place. These are the input roller pair 5a, 5b, the middle pair of rollers 6a, 6b and the output or delivery roller pair 7a, 7b, which rotate with in this order respectively increased peripheral speed. Due to these different peripheral speeds of the pairs of rollers, the sliver FB ', which is spread like a nonwoven in the drafting system and clamped along the clamping lines of the respective pairs of rollers, warped in accordance with the ratio of peripheral speeds. The pair of input rollers 5a, 5b and the middle pair of rollers 6a, 6b form the so-called pre-delay field VF, the middle pair of rollers 6a, 6b and the delivery roller pair 7a, 7b, the so-called main drafting field HF.

In the main drafting field HF, a pressure rod 20 is also arranged, which redirects the sliver FB 'and thus provides better guidance of the fibers, in particular the fibers not clamped between the two pairs of rollers 6a, 6b and 7a, 7b (so-called floating fibers). The warped sliver FB 'is summarized by means of a Umlenkoberwalze 9 and a belt forming device 10 and a Kalanderwalzenpaar 13, 14 and a curved band channel 16 which is arranged in a rotating with the angular velocity ω turntable 17, at a speed V _L in a Can 18 stored. It should be noted that in Figure 1, only mechanical components of the route are shown. Regulating facilities, central computer, drives and the like Like. Are not shown, since they are not essential in the context of the present invention and preferably can correspond to the known designs.

Since dirt (including short fibers) is released from the sliver or fiber fleece FB during the drafting process, a suction device which comprises a suction head or a suction hood 30 is usually provided in the known sections. This is pivotable from above about a pivot axis 34 at a short distance to the top rollers 5b, 6b, 7b, 9 via the drafting device 4, so that dust and dirt are sucked through suction channels in the suction hood 30. If an operator needs access to the drafting system 4, for example, when changing the clamping line distances or when inserting sliver FB 'in the drafting device 4, the suction hood 30 is pivoted upwards (see also double arrow f6 in Figure 2).

In the enlarged view of FIG 2, the drafting 4 and the suction hood 30 are shown in more detail. The exhaust hood 30 comprises an outer housing of a plurality of sheets having an upper plate 31, a horizontally extending portion 31 a and an adjoining in the direction of the drafting input thereto angled portion 31 b, which expires open at the bottom, and two side plates 32 (s. Figure 2a), each having a lower edge 32a. The side panel 32 facing the viewer is removed in the representation of FIG. 2 (and also in the illustration according to FIG. 7).

The suction hood 30 further comprises two internally disposed Saugkanalwände 51, 52 which extend in accordance with the present embodiment substantially parallel to the inclined portion 31 b of the upper plate 31 and have in its rear portion a horizontally extending bend.

At the ends of the suction channel walls 51 and 52 pointing to the drafting device 4, a stripping device 41 or 42 is attached, each extending essentially over the width of the respective associated upper roller 6b or 7b. The stripping devices 41 and 42 are aligned with the Saugkanalwänden 51 and 52. The free ends of the stripping means 41, 42 are on the respective upper rollers 6b and 7b. Likewise, on the Umlenkoberwalze 9 also over its width extending stripping device 43 is provided which is frontally attached to the side walls 32 of the suction hood 30. Such attachment is also possible for the stripping means 41, 42.

The design of the suction hood 30 together with the Saugkanalwände 51, 52 is such that with the aid of a fan 55, shown schematically, driven by a motor 55 suction f1-f4 are generated sucking the drafting 4 fibers, dirt or the like in the exhaust hood 30 and then dissipate through channels not shown. The construction according to FIG. 2 provides that both the pre-drafting field VF and the main drafting field HF are freed by means of spatially separate suction channels 35, 36. Also, a separate suction channel 37a is formed between the top rollers 7b, 9. Dirt below the stripping device 43 is removed by a suction channel 37b (arrow direction f4).

At the lower edge 32a of one of the side plates 32 of the suction hood 30 attacks a pneumatic cylinder 63, the lifting cylinder can be moved in the vertical direction. The pneumatic cylinder 63 is attached to a main body 75 of the track 1 and can be controlled via a control device 70 via an electrical line 71. The compressed air comes from a compressed air source 62, which supplies the pneumatic cylinder 63 via a compressed air line 61. If the lifting cylinder of the pneumatic cylinder 63 is actuated and moved upward in the direction of the double arrow f7, the entire suction hood 30 is pivoted about the pivot axis 34 (see double arrow f8). By appropriate control of the pneumatic cylinder 63, the suction hood 30 can be lowered again according to the double arrow f8. Said elements 61, 62, 63, 70, 71 are all parts of a lifting device 60 for repeatedly lifting the stripping device 41, 42, 43 and in the present case even the entire suction hood.

Reference to the figures 3 and 4 will be explained in more detail below how the inventive lifting and lowering the suction hood 30 together with the stripping 41, 42, 43 leads to improved soil removal. As an example serves the delivery upper roller 7b, on which a stripping device 42 rests in the form of a cleaning lip. The stripping device 42 consists essentially of a support body 42a and an elastic support portion or braking portion 42b, which is formed in the illustrated embodiment as a resilient lip made of plastic. The support body 42a may be, for example, a rod, a tube or a flat bar. The support section or the lip 42b can be fixed in a form-fitting manner on the support body 42a by injection molding. In this arrangement, the support portion 42b with the weight of the stripping device 42 on the roll surface of the upper roll cover 7b 'of the upper roll 7b.

As can be seen from FIG. 3, dust, dirt, fibers and the like accumulate. - In the context of this description referred to as dirt and in the present case characterized by S1 - in the collecting gap SP between the support portion 42b and the roll shell surface from. This dirt comes in particular from the sliver or fiber fleece FB ', which is deposited in part on the top roller 7b and must be removed for the purpose of optimal clamping on the roller pair 7a, 7b of the lateral surface of the roller 7b. However, it has proved to be problematic to remove this dirt S1 from the collecting gap SP. The suction flows f2 and f3 are not effective for this purpose.

According to the invention, the lifting device 60 is used for the removal of the dirt S1 from the collecting gap (see FIG. When actuated, the pneumatic cylinder 63 presses the suction hood 30 high in order to allow it to fall again after a predefined time because of its own weight (see also FIGS. 2 and 2a). The dirt S1 is loosened by lifting in the collecting gap SP, that the suction flow f3 now air f3a sucked through the opening gap SP and promotes the dirt S1 under the stripping 42 ago in the suction channel 37a and transported away. The lifting height Δs, ie the maximum distance between the free longitudinal edge of the support section 42b and the immediately opposite roller surface, is preferably between 10 and 20 mm (see FIG.

FIG. 5 shows an advantageous embodiment of the stripping device 42. In this case, not all the dirt S1 is collected in the collecting gap SP between the support section 42b and upper roller 7b. Rather, advantageously at least a portion - preferably a majority - of the dirt S2, which undergoes a force component in the direction of the drafting input by the rotating top roller 7b, elevates the elastic support portion 42b locally (ie, only in the immediate vicinity of this dirt S2) and is transported therethrough , Subsequently, as shown in FIG. 6, the air flow f2 entrains the material S2, the air flow f2 being directed substantially opposite to the direction of transport of the dirt S2 as it passes through the support section 42b and the top roller 7b. The stripping device 42 together with the removal mechanism in this case corresponds advantageously to the embodiment as shown in the DE 102 07 255 A1 is described. The additional removal of the dirt S1 shown in FIG. 4 represents an improved and more complete possibility for removing the dirt which could not be transported through the collection gap SP.

It makes sense to lift the stripping devices 41, 42, 43 immediately before a machine stop during a can change, so that the dirt set in the collection gaps SP does not fall into the downstream nonwoven nozzle, which is part of the strip forming device 10 (see FIG and then causing a tape jam when restarting the machine. It is therefore advantageous to always raise the suction hood 30, together with the stripping devices 41, 42, 43, if a counting device for measuring the strip length has one early can change (pre-signal) indicates. It has been found to be advantageous that the corresponding lift-off time before such a can change is between 1 and 20 seconds.

Alternatively or additionally, the suction hood 30 together with the stripping means 41, 42, 43 in normal operation, i. in the high-speed machine, the lifting time being advantageously between 1 and 10 seconds. The term lift-off time denotes the duration of the lifting of the stripping devices 41, 42, 43 from the corresponding upper rollers 6b, 7b, 9. The lifting movements can be slowed down by means of a throttle. In normal or fast running on the machine, it has also proven to be beneficial to set the time between two liftoffs between 30 and 300 seconds.

The abovementioned numbers are advantageously adjustable by an operator with the aid of the display on the machine and are determined, for example, by the degree of soiling of the fiber material, the selected delivery speed of the outgoing belt, the selected draft and the set draft field widths.

FIGS. 7 and 7a show a possibility with which the stripping devices 41, 42, 43 and thus also the position of the suction channels 35, 36 can be adjusted with regard to their positioning. In an adjustment of the drafting field width of the main drafting field HF - possibly together with an adjustment of the Vorverzugfeldes VF - (see double arrows f9 and f10) by adjusting the pairs of rollers 6a, 6b and possibly 5a, 5b, it is appropriate, the stripping device 41 also to a new Adjust the position of the top roller 6b. According to the invention it is provided that the suction hood 130 is formed in two parts. A fixed hood part 130a is coupled to a movable hood part 130b via a screw connection. On the upper side, the hood part 130a has a round bore, through which a screw with nut 134 is guided. At the top of the hood part 130b an elongated hole 134a (see FIG. 7a) is provided, which extends in the sliver transport direction and through which the screw 134 is likewise guided. When adjusting the pair of rollers 6a, 6b in the direction of the double arrow f10, the nut is released and the second hood part 130b along the double arrow f11 so shifted that the stripping device 41 again assumes the optimum position with respect to the upper roller 6b. Accordingly, the position or the width of the suction channels 35, 36 changes. For this purpose, a length scale is preferably provided on the slot, which corresponds to a length scale on the roller bearings. Both the new drafting system distances and the optimum hood position can thus be adjusted on the basis of the length scales.

FIGS. 8 and 9 show an example of a lifting device 160 for lifting off stripping devices 141, 142, 143 assigned to the lower rollers 5a, 6a, 7a (likewise embodied here as cleaning lips) by means of individual electromagnets 163. The electromagnets 163 are separately deliverable to the lower rollers 5a, 6a, 7a by means of a control device 170 (FIG. 8) and can be lifted off them (FIG. 9), see FIG. Arrows f12. The control of the electromagnets 163 by the control device 179 is merely indicated here. By lifting off the wipers 141, 142, 143, the elastic support portions bend back to their straight shape (see Figure 9), while bending in contact with the lower rollers 5a, 6a, 7a in the direction of rotation of the rollers.

The air flow indicated by an arrow f13 carries dirt particles, which fall down from the stripping devices 141, 142, 143, to a fan 150, which is driven by the motor 55, see FIG. FIG. 8). In the lifted state of the stripping devices 141, 142, 143, on the other hand (FIG. 9), the dirt which had settled between the bearing sections of the stripping devices 141, 142, 143 and the associated lower rollers 5a, 6a, 7a is filtered by means of the air flows f14 transported to the fan 150. Of the Air flow f13 (see Figure 8) can of course also be present with lifted stripping devices 141, 142, 143.

The present invention is not limited to the illustrated embodiments. Rather, deviations are possible within the scope of the claims. For example, a stripping device may also be provided on the input top roller 5b. It is also possible that only on the delivery top roller and / or the Umlenkoberwalze a liftable scraper is arranged.

Claims (25)

Device on a spinning preparation machine, in particular a carding machine, track, comber o. The like., With a plurality of lower and upper rollers (5a, 5b, 6a, 6b, 7a, 7b, 9) comprising drafting system (4) for the removal of dirt o. Likewise, with at least one elongated stripping device (41, 42, 43, 141, 142, 143), which rests against a roller (5a, 5b, 6a, 6b, 7a, 7b, 9) of the drafting system (4) and dirt ( S1, S2) from the roller (5a, 5b, 6a, 6b, 7a, 7b, 9) collects, and with a suction device (30; 130; 50, 51, 52, 55) in the region of the stripping means (41, 42, 43, 141, 142, 143) for sucking off the dirt or the like, characterized by an electronically controlled lifting device (60, 160) for repeatedly lifting off the at least one stripping device (41, 42, 43, 141, 142, 143) from the Roller (5a, 5b, 6a, 6b, 7a, 7b, 9), whereby dirt (S2) from the stripping means (41, 42, 43, 141, 142, 143) and / or the roller (5a, 5b, 6a , 6b, 7a, 7b, 9) and dissolves from the Absaugeinric (30; 130; 50, 51, 52, 55) can be sucked off. Apparatus according to claim 1, characterized in that the at least one stripping device (41, 42, 43, 141, 142, 143) is designed as a cleaning lip with an elastic support section (42b) which is attached to the at least one roller (5a, 5b, 6a , 6b, 7a, 7b, 9) and in the direction of the drafting input, so that between the support portion (42b) and roller (5a, 5b, 6a, 6b, 7a, 7b, 9), a collecting gap (SP) is formed, in which collects dirt (S2) entrained by the roller (5a, 5b, 6a, 6b, 7a, 7b, 9). Apparatus according to claim 2, characterized in that the support section (42b) of the stripping device (41, 42, 43; 141, 142, 143) is designed and arranged such that parts of the dirt transported by the roller (7b) support the support section (42b ) lift locally, so that this dirt (S2) reaches the other side of the stripping device (41) and there sucked by an upper suction channel (35). Device according to one of the preceding claims, characterized in that the at least one stripping device (41, 42, 43, 141, 142, 143) together with at least one of the suction channels (35, 36, 37a, 37b) of the suction device (30; 50, 51, 52, 55) can be lifted and lowered again. Device according to one of the preceding claims, characterized in that the at least one stripping device (41, 42) is arranged on at least one suction channel wall (32, 51, 52) of the suction device (30; 130; 50, 51, 52, 55). Device according to one of the preceding claims, characterized in that the longitudinal side of the at least one stripping device (41, 42) facing away from the roller (6b, 7b) is attached to a suction channel wall (51, 52) of the suction device (30; 130; 50, 51, 52 , 55) is attached. Device according to one of the preceding claims, characterized in that the at least one stripping device (41, 42, 43) is fastened at its two lateral end faces to side walls (32) of a suction channel (35, 36, 37a, 37b). Device according to one of the preceding claims, characterized in that on the one side of the at least one stripping device (41; 42; 43) a first suction channel (35; 36; 37a) and on the on the other side of the stripping device (41; 42; 43) a second suction channel (36; 37a; 37b) is arranged. Device according to one of the preceding claims, characterized in that the dirt (S2) which is released by the electronically controlled lifting of the at least one stripping device (41, 42, 43) can be sucked off the second suction channel (36; 37a; 37b). Device according to one of the preceding claims, characterized in that the suction device (30; 130; 50, 51, 52, 55) comprises a suction hood (30; 130). Apparatus according to claim 10, characterized in that the suction channels (35; 36; 37a; 37b) are integrated in the suction hood (30; 130) which can be pivoted away from the drafting arrangement (4). Device according to one of the preceding claims, characterized in that the lifting device (60; 160) comprises at least one electronically controlled pneumatic cylinder (63) and / or electromagnet (163). Device according to one of the preceding claims, characterized in that the lifting device (60) acts on the suction hood (30; 130) in order to lift it. Device according to one of the preceding claims, characterized in that the lifting device (160) acts on the at least one stripping device (41, 42, 43). Device according to one of the preceding claims, characterized in that at least one electronic control (70; 170) is provided with a time switching function, for example a time relay is for controlling the lift-off before a can change and / or for controlling the lift-off during the fast-start of the spinning preparation machine (1). Device according to one of the preceding claims, characterized in that the lifting time before the can change between 1 s and 20 s is adjustable. Device according to one of the preceding claims, characterized in that the lift-off time during the fast run is adjustable between 1 s and 10 s. Device according to one of the preceding claims, characterized in that the time between two lifting operations between 30 s and 300 s is adjustable. Device according to one of the preceding claims, characterized in that the lifting movement (Δs) for the stripping device (41, 42, 43; 141, 142, 143) is adjustable between 10 and 20 mm. Device according to one of the preceding claims, characterized in that in each case one stripping device (42, 43) is provided at least on the output top roller (7b) and / or the deflecting roller (9). Device according to one of the preceding claims, characterized in that a stripping device (141, 142, 143) is provided on at least one of the lower rollers (5a, 6a, 7a). Device according to one of the preceding claims, characterized in that at least one of the suction channels (35, 36, 37a, 37b) are adjustable in length in order to be able to adapt to changed stretching field widths. Device according to one of the preceding claims, characterized in that the suction hood (130) is formed at least in two parts, wherein a hood part (130b) relative to another hood part (130a) is spatially variable. Apparatus according to claim 19, characterized in that a slot adjustment (134, 134a) between the at least two hood parts (130a, 130b) is provided. Apparatus according to claim 24, characterized in that a length scale is provided on the slot, which corresponds to a length scale on the roller bearings.

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