EP3034660A1 - Round comb with guide element - Google Patents

Abstract

The invention relates to a round comb (R) for a combing machine with a base body (18, 20) which is fixed in a rotationally fixed manner on a circular comb shaft (15) and carries on its outer circumference at least one combing set (G) whose setpoint points form an outer enveloping circle (15). HK) and seen in Kämmrichtung (L) of the Kämmgarnitur, following the, the Kämmgarnitur (G) supporting body, on the circular comb fixed guide element (7, 7a) is provided, which at least two, adjacent guide surfaces (f1-f3 ), wherein the first guide surface (f1) adjoining the base body (18, 20) is arranged inside the enveloping circle (HK) and at a substantially constant radial distance (e) to the enveloping circle and the adjoining second guide surface (f2) takes an obtuse angle (±) with the first guide surface (f1). In order to better control the air flows in the region of the solder joint, it is proposed that the radial distance (e) of the first guide surface (f1) of the guide element (7a) to the enveloping circle (HK) be between 4 and 10 mm and the second guide surface (f2) a Angle (±) between 130 ° - 170 ° with the first guide surface (f1) assumes, wherein the - seen in the combing direction (L) of the Kämmgarnitur (G) - rear end (H) of the second guide surface (f2) a radial distance ( M) between 8-18 mm to Hüllkreis circle (HK) of the Kämmgarnitur and seen in the circumferential direction of the circular ridge (R), the length (12) of the second guide surface (f2) is at least twice as large as the length (11) of the first Guide surface (f1).

Description

The invention relates to a circular comb for a combing machine with a base body which is rotatably mounted on a circular comb shaft and carries on its outer circumference at least one Kämmgarnitur whose clothing tips form an outer enveloping circle and seen in Kämmrichtung the Kämmgarnitur, following, the Kämmgarnitur supporting body provided on the circular comb guide element is provided, which has at least two adjoining guide surfaces, wherein the, adjoining the body first guide surface is disposed within the enveloping circle and with a substantially constant radial distance from the enveloping circle and the adjacent second guide surface makes an obtuse angle with the first guide surface.

From the CH-654 599 is an embodiment of a circular comb for a combing machine, wherein seen in the combing direction, following a Kämmgarnitur (needle segment with Kämmnadeln) a part 27 (guide member called) is mounted to reduce the gap between the circular comb and the lower tong plate. The circular comb is rotatably mounted within a suction channel (suction box), on which a negative pressure is applied to suck the combed-out components. With the additionally mounted guide element (Part 27) is to be prevented, that is lifted by the present in the suction passage of suction air, the end of the, transported back from the Abreisszylindern nonwoven fabric before the soldering of the lower Abreisszylinder. Such a lifting of the end of the fibrous web prior to the preparation of, protruding from the pliers and combed tuft interferes with the subsequent piecing (soldering) and leads to dirty and faulty Ansetzstellen (solder joints). With the solution proposed in the CH'599, the previous versions could be improved with regard to disturbing suction air flows.
As can also be seen from the cited prior art, the additional guide element (part 27) can only extend over a certain angle of rotation of the circular comb, so that there is no collision with the lower tong plate of the reciprocating pivoting collet assembly. Due to the demand to operate the combing machines with ever higher numbers of combs, the requirements with regard to the production of high-quality solder joints are becoming ever greater. In other words, with high numbers of combs unwanted air currents have even greater influence on the soldering process. In addition, it is becoming increasingly difficult to keep the returned end of the fibrous web on the circumference of the lower tear roller before the end of the tuft projecting and combed tuft is placed on the end of the fibrous web. Due to the higher rotational speeds of the rotating parts, such as circular comb, brush roller and the faster movements of the other parts, such. As the nipper unit, the air flows generated in the region of the solder joint between the nipper unit and the Abreisszylindern change. D. h., The known guide elements following the combing unit are in the present geometric form no longer able to control the air flow in the region of the solder joint in such a way that trouble-free attachment (soldering) of the combed Faserbartendes to the recirculated end the fiber web is guaranteed.

The invention thus provides the object to improve already known guide elements on the circular comb, and to optimize and train such that they ensure the production of high-quality solder joints on the comber even at high Kammspielzahlen.

To solve this problem, it is proposed that the radial distance of the first guide surface of the guide element to the enveloping circle is between 4 and 10 mm and the second guide surface occupies an angle between 130 ° and 170 ° with the first guide surface, which viewed in the combing direction of the combing assembly - The rear end of the second guide surface has a radial distance between 8 - 18 mm to the enveloping circle of the combing and seen in the circumferential direction of the circular comb, the length of the second guide surface is at least twice as large as the length of the first guide surface.
Due to this special geometry of the guide element, it is possible to control the air currents within the range between the nipper unit, the circular comb and the Abreisszylindern such that even at high Kammspielzahlen to hold the, for the subsequent soldering back transported end of the fibrous web in abutment on the circumference of the lower Abreisszylinders to hang the combed end of the tuft exactly on the end of the fibrous web.

Fig.1

eine schematische Seitenansicht eines Kämmkopfes einer Kämmmaschine mit einem Rundkamm bekannter Bauart.

Fig.2

eine schematische Seitenansicht eines Rundkammes mit erfindungsgemäss ausgebildeten Führungselementen.

Fig.3

eine Seitenansicht X nach Fig.2

Advantageously, it is proposed that the first guide surface has a length between 5 and 20 mm. This ensures that there is no collision of the guide element with the reciprocating pliers and still there is a sufficient reduction of the gap between the lower pliers plate of the pliers and the guide element is present to control the air currents.
Furthermore, it is advantageous if the second guide surface has a length between 20-50 mm.
It is further proposed that between the first and second guide surface, a radius between 5 - 15 mm is provided.
This ensures that the end of the tuft emerging from the combing set can slide gently from the first guide surface onto the subsequent second guide surface. By placing a radius in this transition area, departure edges for the air duct are avoided, which could otherwise lead to additional air turbulence.
Preferably, an embodiment is further proposed, wherein seen in the circumferential direction of the circular comb, adjoins the end of the second guide surface, a third guide surface which forms an angle between 90 ° - 120 ° with the second guide surface and the end of the third guide surface in the direction of the circular comb shaft ,
So that no tear-off edges for the air flow, which can additionally generate air turbulence, it is further proposed that between the second and third guide surface, a soft transition with a radius between 5 - 15 mm is provided.
In order not to apply too much force to the fibers of the tuft presented for combing on impact with the combing set, it is proposed that - seen in the combing direction - a further guide element be attached immediately in front of the base body carrying the combing assembly, which at least two adjoining one another Having guide surfaces, wherein the, adjoining the body first guide surface within the enveloping circle and with a, substantially constant distance between 4 - 10 mm to the enveloping circle is arranged and the adjacent second guide surface an obtuse angle between 130 ° - 170 ° with the first guide surface the front end of the second guide surface having a radial distance between 8-18 mm to the enveloping circle of the combing set and seen in the circumferential direction of the circular comb, the length of the second guide surface is at least twice as large as the - seen in the combing direction of the Kämmgarnitur Length of the first guide surface.
The length of the first guide surface can be between 5 and 20 mm. Likewise, the length of the second guide surface between 20 - 50 mm be With this additional guide element, which may be the same as the guide element behind the Kämmgarnitur, the tuft is gently inserted into the Kämmsegment, creating less fiber damage.
It is further proposed that, seen in the additional guide element in the circumferential direction of the circular comb, adjoins the end of the second guide surface, a third guide surface which encloses an angle between 90 ° - 120 ° with the second guide surface and the end of the third guide surface in the direction of Round comb shaft shows.
To avoid demolition edges for the air flow is further proposed to provide a radius between 5 - 15 mm at the transition between the guide surfaces of the other guide element.
Preferably, the guide elements are made of aluminum or a plastic. This includes the use of fiber composites. In essence, the guide elements should be made of material with a low specific weight, so that the forces acting on the circular comb loads (eg centrifugal forces) can be kept as small as possible.
The attachment of the guide elements on the circular comb can be done in various ways, such as screwing, gluing, welding, etc.
In order to avoid deposits of fibers on the respective guide element, it is proposed that the guide surfaces of the respective guide element have a fiber-free surface. It is possible the guide surfaces of the guide elements to be provided with coatings. Thus, these surfaces can also be made more resistant to wear.
For ease of manufacture, it is proposed that the guide element is integrally connected to the main body. This eliminates the one hand, the assembly of the guide element on the circular comb and on the other hand transition edges are avoided, on which fibers can settle.
Further advantages of the invention will be described in more detail with reference to subsequent embodiments and shown.
Show it:

Fig.1

a schematic side view of a combing head of a comber with a circular comb of known design.

Fig.2

a schematic side view of a circular comb with inventively designed guide elements.

Figure 3

a side view X after Fig.2

FIG. 1 shows a schematic side view of a combing K of a combing machine. In known combers z. B. eight such Kämmköpfe K arranged side by side. The Kämmkopf K, of which only a part of the elements is shown, has a nipper unit 1, which is about the pivot arms 9, 11 about the axes 10, 15 pivoted back and forth within the scope of the combing machine. The axis 10, which is also called the forceps shaft, is driven by a drive, not shown in detail, to give the nipper unit 1 a reciprocating motion. The axis 15 corresponds to the circular comb shaft on which a circular comb R is fixed in rotation. The circular comb shaft 15 with its central axis A is also driven by a drive, not shown, continuously or discontinuously. The mounted below the nipper unit 1 on the circular comb shaft 15 round comb R consists in the known solution shown two spaced apart fixed on the circular comb shaft 15 fixed hubs N1, N2, on the outer periphery on the one hand a base body 18 and on the other hand a mass balance element AG is attached. The attachment of the mass balance element (short compensation element called) takes place as shown schematically on the screws S, via which it is attached to the hubs N1, N2. The main body 18 is also not shown by means the hubs N1, N2 firmly connected. Above the main body 18, which, like the compensating element AG, extends over the entire width B of the circular ridge R, a clothing G is attached. The clothing tips of the clothing G are in an enveloping circle HK. The circumferential angle of the K G is in known combing machines between 90 and 130 degrees and is also referred to as "Kämmwinkel". To reduce the distance between the lower pliers plate 6 and the circular comb R in a certain angular position of the circular comb, a guide element 7 is attached to the base body 18, which extends almost over the entire width B (see Fig. 3 ) of the circular ridge. The guide element 7 has a first, immediately adjacent to the base body 18 guide surface f1, which extends at a distance and approximately parallel to the enveloping circle HK. At an obtuse angle α, a second guide surface f2 adjoins the first guide surface f1. Such a guide element, as in Fig.1 is shown, for. B. from the published CH-654 599 refer to.

The nipper unit is formed from a nipper frame 5, to which a lower nipper plate 6 is attached. On the forceps frame 5, an upper tong plate 2 is pivotally mounted about a pivot axis 4 and pivot arms 3. In the illustrated embodiment, the nipper unit 1 is closed, wherein the outstanding from the nip of the nipper unit fiber tuft FB is detected by the clothing G and combed out. The loading arms (eg springs), which are not shown, engage on the pivoting arms 3, which on the one hand control the pivoting movement of the upper tong plate 2 and on the other hand generate a necessary clamping force in the nip unit of the nipper unit 1. Also in the clamp frame 5, a feed roller 16 is rotatably mounted above the lower tong plate 6, which z. B. is driven in steps by a not shown latch drive. About this feed roller 16, a nip W (or individual slivers) supplied to the nipper unit 1 of the nip of the nipper unit is supplied. After the combing out process of the fiber tuft FB, the nipper unit 1 is pivoted in the direction of a subsequent Abreisswalzenpaare AW. In this pivoting operation, the nipper unit opens and the combed end of the cotton wool W or the fiber tuft FB is placed on the end E of a previously formed nonwoven fabric V and under the action of Clamping the Abreisswalzen AW soldered with this and transported away in the conveying direction F.

FIG. 2 shows an embodiment of an inventively designed circular comb R with a guide element 7a (or 7b), wherein the base body 20 shown here is formed as a hollow profile having a semicircular trough 21 which faces the circular comb shaft 15. In the trough 21, a groove-shaped recess 24 is mounted, within which a support member 13 is located. Between a support surface of the support element 13 and a base of the recess 24 is an exchangeable spacer element D via which the Hüllkreisradius HR of the Hüllkreises HK the Kämmgarnitur G compared to the axis of the circular comb shaft 15 is set or can be changed. One tries the distance c ( Fig.1 ) as small as possible in order to achieve an almost complete combing out of the fiber tuft FB protruding from the tongs.
The trough 21, or the recess 24 is located on an inner portion 22 of the base body 20, on which an outer portion 23 is supported over the ribs. Cavities are formed between the ribs and the inner and outer portions 22, 23.
For attachment of the base body 20 with the support element 13 and a compensation element AG1 on the circular comb shaft 15, the shaft is provided with a plurality of - across the width B of the circular ridge R - through holes provided by which screws S3 protrude. The head of the respective screw S3 is located in a recess of the compensating element AG1. Furthermore, a through hole is provided in the compensation element AG1, which is aligned with the bore of the circular comb shaft 15. Likewise, the support member 13, the spacer element D and the base body 20 provided with through holes, which are aligned with the bores of the circular comb shaft 15 and through which the respective screw S3 protrudes. The end of the respective screw S3 has a thread which projects beyond the bore of the main body 20 in the region of a cavity. On the thread a nut is attached. By tightening the screws S3 and screwing into the threaded hole of the nut of the base body 20 are pressed against the support member 13 and the compensation element AG1 against each other and firmly clamped on the shaft 15 and fixed. Further details of this attachment and the construction of the body as a hollow profile can, for. B. from the published CH-707 882 be removed.
How further from the Fig.2 can be seen is - seen in Kämmrichtung L - behind a Kämmgarnitur G and following the outer portion 23 of the base body 20, a guide member 7 a attached. In this case, the guide element 7a bears with a base GF on an inwardly projecting web R6 of the base body 20 and is fixed means not shown in detail fastening means in the position shown. Fastening by means of screws or rivets can be used. Likewise, the guide means can be connected via adhesives or welding and solder joints with the body. It is also possible to form the guide element in one piece with the base body. D. h., The guide means 7 a (or 7 b) is simultaneously integrated in the manufacture of the base body 20 with.
The guide means 7a has in the present example, a first guide surface f1, which may have a length l1 of 5 to 20 mm. The guide surface f1 extends in an approximately parallel distance e of 4 to 10 mm to the outer enveloping circle HK of the Kämmgarnitur G. At an obtuse angle α between 130 ° and 160 ° adjoins the first guide surface f1 a subsequent second guide surface f2. At the transition between the first and second guide surface, a radius r1 of 5 to 15 mm is provided. This creates a smooth transition and avoids a spoiler lip, which can sometimes lead to Luftvenivirbelungen. The end H of the second guide surface has a radial distance M to the enveloping circle HK between 8 and 18 mm. This ensures that even over the rear region of the guide element 7a there is still a sufficient constriction of the air passage below the lower tong plate in order to control the air flows, whereby a collision of the guide element with the lower tong plate is excluded.
Subsequent to the second guide surface f2, a third guide surface f3 is provided which occupies an angle β between 90 ° and 120 ° with the second guide surface f2. The third guide surface f3 opens into the base GF of the guide element 7a. For the reasons described above, a radius r2 of 5 to 15 mm is provided in the transition from the second guide surface f2 to the third guide surface f3. As seen from the schematic view X after Fig.2 from the Figure 3 refer to, The longitudinal direction LR of the guide element 7a (FIG. 7b) extends over the width B of the circular ridge R and in this case has a width b which corresponds to the width b of the combing segment G. The attachment of the proposed guide element 7b allows uncontrolled air currents to be avoided in the area in which the soldering takes place. In particular, this avoids that the end of the conveyed back fiber mat can already stand out before the soldering of the peripheral surface of the lower tear-off roller.
In dash-dotted representation, a possible attachment of another guide element 7b is shown, which seen in the direction of combing L, in front of the Kämmgarnitur G, or in front of the outer portion 23 of the base body 20 is mounted. The guide element 7b corresponds in its outer shape to the already described guide element 7a and is mounted in mirror image on the opposite side on a web R1 of the main body 20. The guide element 7b also has three guide surfaces F1 'to f3', which run with the already described angles α and β to each other. The length l1 'of the first guide surface f1' may also be between 5 and 20 mm, while the length l2 'of the second guide surface f2 may extend over 20 to 50 mm. At the transitions between the guide surfaces f1'-f3 ', radii r1 and r2 are also provided for the reasons already described.
The distance e 'between the enveloping circle HK and the first guide surface f1' is between 4 and 10 mm, while the radial distance M between the end H 'of the second guide surface f2' and the enveloping circle HK is between 8 and 18 mm.
The attachment of the guide element 7b on the base body 20 can be carried out according to the already described attachment of the guide element 7a.
Due to the additionally mounted second guide element 7b with the correspondingly arranged guide surfaces f2 'and f1', the end of the fiber tuft FB is already aligned and prepared for entry into the combing segment G, so that an abrupt deflection of the tuft on entry into the combing set is avoided. This fiber damage can be avoided. Likewise, the use of the additional guide element also has beneficial effects in terms of a controlled air flow in the area between the pliers and the Abreisswalzen AW.

Claims (12)

Round comb (R) for a combing machine with a base body (18, 20) which is rotatably mounted on a circular comb shaft (15) and on its outer circumference at least one Kämmgarnitur (G) carries, whose clothing tips form an outer envelope circle (HK) and in the combing direction (L) seen the Kämmgarnitur, following the, the Kämmgarnitur (G) carrying the base body, a circular comb mounted on the guide element (7, 7a) is provided, which at least two, adjacent guide surfaces (f1-f3), wherein the first guide surface (f1) adjoining the base body (18, 20) is arranged within the enveloping circle (HK) and with a substantially constant radial distance (e) to the enveloping circle, and the adjoining second guide surface (f2) has an obtuse angle (α) occupies with the first guide surface (f1), characterized
that the radial distance (e) of the guide element (7a) to the enveloping circle (HK) between 4 of the first guide surface (f1) - is 10 mm and the second guide surface (f2) an angle (α) between 130 ° - 170 ° with the first Guide surface (f1) assumes, wherein the - seen in the combing direction (L) of the Kämmgarnitur (G) - rear end (H) of the second guide surface (f2) a radial distance (M) between 8 - 18 mm to the outer circle (HK) of Has a Kämmgarnitur and seen in the circumferential direction of the circular ridge (R), the length (12) of the second guide surface (f2) is at least twice as large as the length (l1) of the first guide surface (f1). Circular comb according to claim 1, characterized in that the first guide surface (f1) has a length (l1) between 5 - 20 mm. Circular comb according to one of the preceding claims, characterized in that the second guide surface (f2) has a length (l1) between 20-50 mm. Circular comb according to one of the preceding claims, characterized in that between the first and second guide surface (f1, f2) a radius (r1) between 5 - 15 mm is provided. A circular comb as claimed in any one of the preceding claims, characterized in that, in the circumferential direction of the circular comb (R) seen at the end (H) of the second guide surface (f2) adjoins a third guide surface (f3), which forms an angle (β) between 90 ° - 120 ° with the second guide surface (f2) encloses and shows the end of the third guide surface (f3) in the direction of the circular comb shaft (15). Circular comb according to claim 5, characterized in that between the second and third guide surface (f2, f3) a radius (r2) between 5 - 15 mm is provided. Circular comb according to one of the preceding claims, characterized in that - seen in the combing direction (L) - immediately before the, the Kämmgarnitur (G) supporting base body (20), a further guide element (7b) is mounted, which at least two adjacent guide surfaces ( f1'-f3 '), the first guide surface (f1') adjoining the main body being arranged within the enveloping circle (HK) and at a substantially constant distance (e ') of between 4 and 10 mm from the enveloping circle (HK) and the adjoining second guide surface (f2 ') occupies an obtuse angle (α) between 130 ° and 170 ° with the first guide surface (f1'), the front end (seen in the combing direction (L) of the combing set (G)) H ') of the second guide surface (f2') has a radial distance (M) between 8 - 18 mm to Hüllkreis circle (HK) of the Kämmgarnitur and seen in the circumferential direction of the circular ridge (R), the length (l2 ') of the second Führungsfläc he (f2 ') is at least twice as large as the length (l1') of the first guide surface (f1 '). A circular comb as claimed in claim 7, characterized in that characterized in that, the further guide element (7b) in the circumferential direction of the circular comb (R) seen 'has that at the end (H a third guide surface (f3)' () of the second guide surface f2 ') and an angle (β) between 90 ° - 120 ° with the second guide surface (f2 '), with the end of the third guide surface (f3') pointing in the direction of the circular comb shaft (15). A circular comb as claimed in claim 6, characterized in that the transition between the guide surfaces (f1 ', f2', f3 ') of the further guide element (7b) has a radius (r1, r2) between 5-15 mm is provided. Circular comb according to one of the preceding claims, characterized in that the respective guide element (7a, 7b) consists of aluminum or a plastic. Circular comb according to one of the preceding claims, characterized in that the guide surfaces (f1-f3, f1'-f3 ') of the respective guide element (7a, 7b) have a non-woven surface. Circular comb according to one of the preceding claims, characterized in that the respective guide element (7a, 7b) is integrally connected to the base body (20).

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