DD217839A5 - DEVICE FOR SHEARING TRACKS - Google Patents

Abstract

The invention relates to a device for shearing fabric webs. While the aim is to produce an exactly uniform and clean-looking surface of the material to be sheared, it is the task to provide a shearing machine whose shearing cylinder interacts with a lower knife to make available, with their operation, the erection of the shearing Fibers or Faeden and the removal of the particles to be removed is ensured in each case. The device is characterized in that the shear coils and the Luftdurchtrittsoeffnungen are arranged on the projection smooth smooth surface of the shear cylinder that the shear cylinder is surrounded over its length and in dense association on the circumference of a closed up to a small Saugoeffnung in the shear zone Duesenkasten and that the Scherzeug has a cooperating with the shear cylinder lower blade. Fig. 1

Description

Berlin, 5.12.1983

AP D 06 C / 254 394/7 ^l * 62 906/28

Device for shearing fabrics Field of application of the invention ,

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The invention relates to a device for shearing fabric webs with a shear coil provided and arranged above a fabric support designed as a hollow cylinder shearing cylinder with distributed over the shell arranged air passage openings and connected to at least one end of the shear cylinder and its interior suction.

Characteristic of the known technical solutions

Shearers are known to have the task 'Maren tracks rationally * d, h, to process with high throughput exactly, with the "cleaning" of raw fabric, the Florhöhenegalisierung of Polware * such as velvet, plush o. Ä., Or the Kahlschur of cloths in question · It is extremely important that the surface of the material to be sheared after machining has an exactly uniform appearance. To achieve this, it is necessary that the pile or the threads to be sheared are optimally fed to the fabric web in the Scherzeug. In particular, it is necessary to take measures that cause an erection of the fibers to be sheared at the shearing point. Above all, the sheared particles should be removed immediately and completely from the shear zone.

From DE-PS 16 35 304 is known, with Veizicht on cooperating with the shear cylinder lower blade on des-

1fiDEZ.19S3 * l36949

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sen body to provide an air jet device, which counteracts the direction of web travel to be sheared VVarenbahnoberflache rait compressed air applied to shear the

Erect fibers before reaching the shearing point. In addition, the device according to DE-AS 16 35 304 uses a co-operating with the shear cylinder suction device, which consists of a connected to the interior of the hollow shear cylinder shaft suction air source and sucks air from der.Außenseite the shear cylinder through holes mounted in the shaft. As a result, the Florauf direction and the removal of the sheared particles are to be favored.

An essential hangel the known device is' that the shear coils of the shear cylinder do not cooperate with a lower blade and therefore not cut off the fibers, but can only tee off. This deficiency is obviously due to the fact that because of the arrangement of the described Blasdüseneinrichtung a bottom blade finds no more space. In the known device, the shear coils are mounted on helically extending over the shaft sheath ribs, while the air passage openings are arranged in the grooves formed between these ribs. This structurally complex measure has the disadvantage that the air is trapped between the ribs carrying the shear coils and pulsates there and that the ribs themselves are not in the suction air stream,. , '

Object of the invention

Target d r invention is to provide an apparatus for shearing

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Fabric panels so that the surface of the material after machining has a very uniform appearance and is free of sheared particles.

Explanation of the essence of the invention

The invention has for its object to provide a device for shearing fabric webs with a shear coil provided and arranged above a fabric support designed as a hollow cylinder shear cylinder distributed over the jacket disposed air passage openings, and with a connected to at least one front end of the shear cylinder and its interior suction to create, with structurally and with no equipment costly measures a shearing machine, the shear cylinder cooperates with a Untertnesser, is made available in their operation, the erection of the fibers or threads to be sheared and the removal of the particles to be removed in any case.

According to the invention, the object is achieved in that the shear coils and the air passage openings are arranged on the projection smooth smooth surface of the ScherzylinderS that the shear cylinder is circumferentially surrounded by its length and in close association of a closed up to a narrow suction port in the shear zone nozzle box and that the product has a lower knife interacting with the shear cylinder «

The fact that the shear coils and the Luftdurchtrittsöff- * ments on the smooth projection surface smooth

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Shear cylinder are arranged, results in addition to a simpler manufacturability of the shear cylinder the advantage that the * provided between two shear helical helical grooves extend unterbrschungsfrei over the entire shear cylinder length away, so that deifvom at each point. Shear cylinder covered web, the suction can be effective. Due to the fact that the heavy cylinder is circumferentially surrounded by a nozzle box which is closed on the circumference up to a narrow section in the shear area, only where it makes sense and is necessary, namely shortly before and shortly after the shearing zone, the Fabric surface applied with suction air. In the device according to DE-AS 16 35 304 sucks the suction constantly from the entire environment of the "shear cylinder air on» so for the most part in areas where this brings no effect. In order to achieve an effective effect, therefore, an exceptionally oversized suction fan is required in the prior art device in addition to a compressed air device. In the subject of the application, the lower blade cooperating with the shearing cylinder can be disposed of by dispensing with the blowing nozzle necessary in the case of the previously known object.

The invention achieves with the said measures a tightly concentrated on the shear zone concentrated suction air flow with the result that just before the shear zone to be sheared threads, fibers od. Like. And also supplied with error threads with security of the shear device and the separated particles immediately behind the Shaving place to be sucked off. Another advantage of the invention is

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in that their success does not depend on the nature of the web run. While in the device according to DE-AS 16 35 304 already due to the lack of lower blade only a topping table as »Varenbahnauflage in question, can also be used in the inventive device, a hollow table or a figure-shear table.

Although it is generally known to provide the shearing cylinder of a shearing machine with an open to i / arenbahnoberflache, otherwise closed cover. This is shown for example in DE-P ¹ S 916 046 "There, however, in contrast to the invention, the underside opening of Ab-. Covering is not confined to the shear point, but consciously in IVa renbahnlauf direction, a considerable distance to move behind the Scherstelle «Eingangsaitig the cover are arranged on this also Leitschaifein, which should cause an acceleration of the incoming air and thus a negative pressure, the air is sucked in by a cyclone diffuser, which is arranged on the side of the shearing cylinder 'opposite the side bearing the jigsaw blades above the lower blade. In the known device, the cover thus serves to generate a Unterdrukraums, while the nozzle box of the invention the. Task has to closely bundle the suction air flow to the shear point. Devices of the construction described in DE-PS 916,046 also have the considerable disadvantage - that the cut-off material is accelerated by the shear spiral and centrifuged in non-definable directions, prevents the self-ventilation of the shear cylinder - of a certain speed / shear coil number ratio -

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the suction with the result that the scraps instead of being erected, is knocked down. In addition, the construction is expensive, because the suction port of the cyclone diffuser must extend appropriately over the entire shear cylinder length away. A very advantageous side effect of the invention is that the suction channel is formed by the cavity of the shear cylinder itself and therefore present without further action. With reference to the prior art, the invention has succeeded in optimizing the basic idea of "shear cylinder extraction" without. to take over the disadvantages inherent in the previous systems.

An advantageous development of the invention in terms of even stronger bundling of the suction air flow is that a nozzle tube is arranged machine-fixed in the interior of the shear cylinder at a small distance to Zyiinderirnenmantelfläche whose at least one arranged in a limited peripheral portion nozzle is assigned to the shear zone, in this embodiment the interior of the Düs'enrohrss is sucked, whereby the Saugluftstrom also bundles within the shear cylinder on the nozzles of the opening opposite narrow cylindrical zone and thus even more on the shear zone. A particularly simple design of the nozzle tube is that this has a longitudinal slot which forms the single nozzle.

The invention also allows without difficulty the additional arrangement of a compressed air to the web rear side in that in the area of the fabric support a blowing nozzle for additional loading of the fabric web

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rear side is provided by means of compressed air flow. Die'se supporting admission and penetration of the fabric. By means of compressed air from the back of the egg, it could possibly be advantageous to use it in the case of particularly difficult shavings. ' ^V

In connection with the extraction of the apparatus required can be limited to a minimum, that for suction of the shear cylinder and the compressed air to the web rear side a single blower is provided, the suction side with the shear cylinder and the pressure side - with the interposition of a dust filter - with the 3lasdüse air-conducting connected is·

According to a further advantageous feature of the invention can be rotatably connected to the shear cylinder at least one arranged at or in the end or »Stirnendbereich fan. This rotationally rigid with the circumferentially driven shear cylinder revolving fan - axial fan or radial fan - does not require self-propelled. The arrangement also has the advantage that the suction power is adjusted fully automatically and without further measures in dependence on the rotational speed of the shearing cylinder. - '

In a constructive embodiment, the shear cylinder may have at both ends each have a fan, both fans, counteracting, generate negative pressure in the interior of the cylinder. It is also possible to provide the shear cylinder on one side with a closed bottom and the

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Extraction only at the other end by a fan.

The "Selbstabsaugung" of the shear cylinder also offers the advantage of a further embodiment, which consists in that the shear cylinder can be connected with one or both ends directly to a, for example, integrated in the machine frame, Staubabscheidevorrichtung.

"'! Ausführungsbeispial

• The invention will be explained in more detail with reference to several Ausführungsbeispfelen. In the accompanying drawings show;

FIG. 1 shows a schematic cross section through a shearing device in the shear area; FIG.

Fig. 2 is a cross-section of an enlarged device; Fig. 3 is a view of a shear cylinder;

Fig. 3a: a corresponding view of the shear cylinder, but without shear spirals;

4 shows a longitudinal section through a fan cylinder equipped with a Soherzylinder.

FIG. 5 shows an arrangement of two shear cylinders connected to a dust separation device.

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An apparatus for shearing a fabric web 10 has a shearing cylinder 12 driven in rotation in the direction of an arrow 11, the outer surface 13 of which is equipped with a large number of shearing knives 14. The individual razors 14 extend helically in the longitudinal direction of the shear cylinder 12 (see also Fig. 3), so that in the following at the shear blades 14 of shear coils 15 will be discussed. In a shearing zone 16, the shearing cylinders 12 cooperate with a lower or counterweight IS which is adjustably mounted on the machine frame 17. ; ,

In the shear zone 16, the fabric web 10 with its fibers or »pile 19 in the direction of the product consisting of shearing cylinder 12 and lower or counter knife 18 is guided as a fabric support 21 according to FIG. A two mutually spaced table edges 22; 23 auftveisender hollow table for a fabric 10 'is shown as an alternative possibility of a fabric support in Fig. 1 with dash-dotted lines.

On the substantially smooth-surfaced outer surface 13 of the shear cylinder 12, the individual shear coils 15 by means of baseboards 24 by means of tension by means of 'penetration 44 (Fig. 4) fixed »Apart from these foot pieces have the spiral grooves 25 in their longitudinal direction on the shear cylinder 12 no projections. 'Projections across the spiral grooves 25 are not present at all,

The relatively thin-walled cylinder jacket 25 is, as regularly as possible, provided with a multiplicity of airflows.

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provided in the embodiment as in the longitudinal direction of the shear cylinder 12 extending slots (see Fig. 3 to 4) «The interior 28 of the hollow shearing cylinder 12 is connected to a not shown in Fig. 1 suction device so in air-conducting connection, that the air surrounding the outside of the shear cylinder 12 is sucked into the inner tube 23 and then transported axially away. The resulting suction sucks off the particles to be removed and serves to raise the pile 19 to be sheared or the threads of the fabric 10 to be sheared to the shear zone 16 bin, in order to supply them to the crop in accordance with the cut.

In order to achieve a suction effect that is as narrow as possible and strong on the shear zone 16, the shear cylinder 12 is surrounded by a nozzle box 29 with small distances on all sides. The nozzle box 29, whose right side wall of the machine frame 17 is provided with respect to FIG. 1, is almost completely closed around the scissoring cylinder 12. It leaves only a narrow substantially gap-shaped opening 30 directly in the region of the shear zone 16 free. This has the consequence that the prevailing in the interior 28 of the shear cylinder 12 strong negative pressure in the fabric direction 31 behind the shear zone 16 on the pile 19 exerts a suction, which is illustrated with the arrow share 32 »This has an erecting of the pile in almost exactly radial Direction with respect to the shear cylinder 12 to the result »The Scherzeug 12 can then easily do its job exactly. The sheared .Faden residues are sucked out, also in consequence of the pressure prevailing in Innenraura 28 of the shear cylinder 12 negative pressure.

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The current profile of these threads is schematically indicated by the arrow 33 crowd.

In support of the described extraction process, which is additionally illustrated in FIG. 1 by dashed lines, a blowing nozzle 34 can be arranged in the fabric support 21, which then communicates with a blower 36 via an air duct 35 · »This compressed air device blows a stream of compressed air 37 from the fabric web 10a forth through the fabric 10 in the direction of the shear zone 16 and thereby supports the erection of the pile 19 and blowing out adhering loose particles, This additional compressed air device can be provided in particularly difficult cases in addition to the described suction Such a case, for the production of compressed air on the one hand as the suction air on the other hand, a single fan 36 or * fan can be used, the pressure side 36a with the tuyere 34 and the suction side 36b with the interior 28 of the shear cylinder 12 in each air-conductive Verbxdung »It arises on this Weis e a circulating air pressure-suction method.

The device shown in Fig. 2 differs from the device described with reference to FIG. 1, characterized in that in the interior 28 of the cylinder in close proximity to the cylinder inner surface 38, a nozzle tube 39 is fixed to the machine, "machine-proof" means that the nozzle tube 39 to Although its longitudinal axis can be adjusted as desired, it is not rotated together with the shearing cylinder 12. The nozzle tube 39 has - in the exemplary embodiment

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play a single - slot-shaped nozzle 40, which in the cross section of Fig. 2 as the shear zone 16 directly associated cross-sectional interruption. The nozzle tube 39, with its narrow nozzle assigned to the shearing zone 16, effects a further concentration of the suction flow which, in the exemplary embodiment illustrated, acts on only two air passage openings 27 positioned immediately before and immediately behind the shearing zone 16.

Fig. 3 clearly shows a shear cylinder 12 in view , While in Fig. 3a schetnatisch some Strorafäden of the cylinder outside and sucked through the shear cylinder 12 air. , ,

Another idea of the invention makes it possible to dispense with a special suction unit, which according to FIG. 4 ζ. B * is possible, that are arranged at the ends 41 of the shear cylinder 12 with this rotatably connected fans 42. These fans 42 generate in the interior 28 of the shear cylinder 12 a negative pressure which increases due to the increasing speed of the shear cylinder 12 rotational speed of the fans 42 one * The sucked from the outside of the shear cylinder 12 air is then to both ends 41 of the shear cylinder 12 out sucked and blown, for example, in downstream Staubabscheidevorrichtungen 43 (Fig. 5).

The described arrangement of one fan 42 in each of the two ends 41 of the shear cylinder 12 should be the most effective. However, it is also conceivable that one of the

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the ends 41 to close with a bottom and only one side to arrange a fan / 42. )

It is of course also possible, instead, to drive the impeller of a centrifugal fan with the shear cylinder 12.

Fig. 5 shows schematically the immediate-connection of two shear cylinder 12 to two Staubabscheidevorrichtungen 43. Significant is in particular the possibility, due to the integrated in the shear cylinder 12 fans 42, the shear cylinder 12 can connect directly to the Staubabscheidevorrichtungen 43, without downstream, to external fans would require leading piping.

Claims (7)

1. An apparatus for shearing fabric webs provided with a shear coil and arranged above a fabric support designed as a hollow cylinder shear cylinder distributed over the jacket arranged Luftdurchtrittsoffnungen auch.mit a connected to at least one front end of the Scherzylindars and his Innenraura Saugein direction, characterized in that the shear coils (15) and the Luftdurcfrtrittsöffnungen (27) on the ^ vorsprungsfrei smooth 'lateral surface (13) of the shear cylinder (12) are arranged, that the shear cylinder (12) over its length and in close association circumferentially from one to a narrow suction opening in the shear zone (16) closed nozzle box (29) is surrounded and that the stuff having a shear with the Soherzylinder (12) co-operating _sub-x tnesser (18) 2, device according to item 1, characterized in that in the interior (28) of the shear cylinder (12) at a small distance from the cylinder inner surface (38) a nozzle tube (39) is arranged maechinenfest whose at least one arranged in a limited peripheral portion nozzle (40) associated with the shearing zone (16). 3 »Device according to point 2, characterized in that the nozzle tube (39) has a longitudinal slot which forms the single nozzle (40). 4 «Device according to points 1 to 3, characterized in that in the region of the fabric support (21) ein- 5. The device according to item 4, characterized in that for the extraction of the shear cylinder (12) and for pressurizing the web rear side (10 a) a single blower (36) is provided, the suction side (36 b) with the shear cylinder (12) and the pressure side ( 36a) is air-conductively connected to the tuyere (34) « 05/12/1983 AP .D 06 C / 254 394/7 \ - 15 - 62 906/28 Blow nozzle (34) for additional loading of the fabric web back (10 a) -giittels compressed air stream (37) is provided. 05/12/1983 AP D xO6 C / 254 394/7 - 14 - i 62 906/28 Claim for invention \ 6. Device according to the points 1 to 5, characterized in that with the shear cylinder (12) at least one in or at its end (41) arranged fan (42) is rotatably connected. : · ', 7. «Device according to item 6, characterized in that the shear cylinder (12) has at both ends a respective fan (42), wherein both fans (42), counteracting, in the interior (28) generate negative pressure, S, device according to items 1 to 7, in particular according to the items 6 or 7, characterized in that the. Shear cylinder (12) with one or both ends (41) is connected directly to a Staubabsoheidevorrichtung (43). , '' For this 5 pages drawings