EP0523419A1 - Method and apparatus for preventing marks on textile tubular materials - Google Patents

Abstract

The tubular knitted fabric is guided by way of a first rotatably designed system of pairs of squeeze rollers and, with the fabric being drawn off continuously at the same time, is squeezed all-round by a second system of squeeze rollers which cooperates with the first system. The possibility that crease markings will occur is thus completely prevented. The squeezing apparatus consists of an externally held rotatably arranged first system of pairs of squeeze rollers which has an adjustable outer circumference and of an externally held rotatably arranged second squeeze-roller system which is matched to the circumference of the first system of pairs of squeeze rollers and which is connected operatively to the first system. <IMAGE>

Description

There has always been a requirement to knit the fleet evenly out of the goods in the case of knitwear in tubular form in successive processes of wet finishing, without the so-called bow markings being recognizable in the tubular goods after being squeezed. For example, when dyeing knitted fabrics with active dyes, in order to maintain a perfect fabric quality, ie dye quality, it is necessary to squeeze the tubular fabric in a precisely defined manner.
When squeezing by means of the well-known squeeze mechanisms, according to which the tubular textile material webs are guided between a first motor-driven squeeze roller, which is rotatably mounted on the machine frame and rotatable, and a second squeeze roller that can be delivered to the first adjustable squeeze roller, bug marks are always produced with two-layer flat tubular goods. This means that the edge of the two-layer flat tubular fabric is deformed, for example, in the case of squeeze rolls with a relatively hard roll surface, while the squeeze effect decreases when squeezing with rolls which have a relatively soft roll surface. Part of the liquor squeezed out of the tubular goods runs back on both sides of the two-layer flat tubular goods after leaving the nip roller gap into the edge areas of the goods. This leads to qualitatively different results when spreading the fleet across the width of the goods. This means, for example, that the fleet is in the middle of the goods
is almost completely removed from the goods, while in the edges, ie in the bow, there is still an undesirable fleet. In the case of goods which are poorly networkable, a bright bow marking and in the case of goods which are well networkable can result in a darker bow marking.

A wide variety of efforts have been made to remedy these circumstances affecting the quality of goods. Thus, according to DE-OS 36 19 922, a method for dyeing tubular goods and a device for carrying out the method is described, the task of which is to provide reliable bug marking even with difficult-to-treat materials and with a formulation of the reaction dyes that is not optimally adjusted to avoid.

According to DE-OS, it is now shown that the bow marking formed during padding is moved in the goods after padding and is squeezed again after the bow marking has been laid, but before it remains cold. The device for carrying out the method is only mentioned briefly. How the device for laying the bow marker and squeezing the tubular goods is structured is not explained in detail.

According to DE-OS 36 00 559, a device for wet treatment of continuously moving tubular goods is proposed, the task of which is to design them in such a way that any bowing marks resulting from the squeezing process are avoided in the tubular goods and a particularly uniform loss of goods is achieved. For this purpose, it is proposed that a circular cross-section is provided in the direction of movement of the tubular goods after the pinch rollers, which engages in the bow markings of the tubular goods which are present on both sides and which keep the goods wide, each consisting of a right and a left tubular spreader in the bow.

Each ring of the hose spreader is intended to cooperate with an external pressure roller in such a way that the bow marking of the tube material is evened out between the respective ring and the pressure roller. However, the solution disclosed in DE-OS does not generally make it possible to avoid bug marks in the course of wet treatment of the tubular goods.

The European patent specification EP 0 166 316 describes a method for removing the bow marking from knitted goods in tubular form and a device for carrying out the method. According to this, the bow marking that occurs when dyeing the knitted fabric in the form of a tube as a result of the squeezing effect is to be absolutely avoided. According to this patent, this should be done in that the knitted fabric is balloon-inflated at least once during the fixing of the applied dyes by means of steam and laid flat again. As a device for carrying out the method it is provided to arrange at least one nozzle for inflating the knitted fabric between the immersion trough and the deflection rollers over which the tubular fabric is guided.

It is an object of the invention to provide a method for avoiding bow markings in textile tubular goods and a device for carrying out the method, which excludes bow markings in the tubular goods and enables a defined, all-round squeezing of the tubular goods.

This object is achieved by the characterizing features of claims 1 and 2.
Refinements according to the invention are the subject of the further subclaims.

On the process side, it is of particular importance that the wet tubular knitted fabric is not fed in as is known, in a flat, wide shape, to the squeeze rollers and the liquor is squeezed out of the fabric, and the attempt is subsequently made to remove the resulting bow marks, but rather the wet tubular Knitted goods are transferred from the flat-laid state to a spread-out state, and the goods are squeezed all around during a continuous withdrawal of goods. Bug markings cannot even arise with this type of work. This is also the great advantage of the method and the device proposed for its implementation.

Fig. 1:

eine Draufsicht auf die Vorrichtung mit Einlaß- und Auslaßpartie,

Fig. 2:

die Ansicht "A" der Vorrichtung mit Einlaßpartie gem. Fig. 1,

Fig. 3:

die Ansicht "B" der Vorrichtung mit Auslaßpartie gem. Fig. 1,

Fig. 4:

eine Schnittdarstellung gemäß Linie C-C nach Fig. 2 bei kleinem Schlauchdurchmesser,

Fig. 5:

eine Schnittdarstellung gemäß Linie C-C nach Fig. 2 bei großem Schlauchdurchmesser,

Fig. 6:

die Antriebseinheit des Abquetschsystems in schematischer Darstellung.

An embodiment of the invention is shown in the drawing. Show it:

Fig. 1:

a plan view of the device with inlet and outlet section,

Fig. 2:

the view "A" of the device with inlet section acc. Fig. 1

Fig. 3:

the view "B" of the device with outlet section acc. Fig. 1

Fig. 4:

3 shows a sectional view along line CC according to FIG. 2 with a small hose diameter,

Fig. 5:

3 shows a sectional view along line CC according to FIG. 2 with a large hose diameter,

Fig. 6:

the drive unit of the squeeze system in a schematic representation.

In Figures 1 and 2, the tubular knitted fabric 1 is in the form of a strand and is stored in a trough carried by a turntable 2. The goods can also be in a board Form stored in trough 3. From the trough 3, the goods 1 run via a rotary tensioner 4 into a detangling head 6 arranged as high as possible on the machine frame 5. Downstream of the detangling head 6 is a flat spreader 7 attached to the frame 5, in which the tubular goods 1 are kept flat and wide. The tubular material subsequently passes via a first deflecting roller 8 to a second deflecting roller 10 arranged below a pair of fixing rollers 9. After the deflecting roller 10, a lower spreader head 11, consisting of support rollers 12 arranged in pairs and the associated paired fixing rollers 9, is provided. The fabric 1 now runs between the support rollers 12 and the associated fixing rollers 9 and is spread out in a round manner by the device according to the invention, which is described below, and is squeezed in this way by a single squeeze mechanism 13, which is arranged inside and outside around the tubular fabric 1, with a continuous fabric take-off that the liquor can run down into the liquor container 14 on the tubing supplied.
After the squeezing, the goods 1 are drawn off via an upper spreader head 11 (FIGS. 2 and 3) and pulled off in a flat-spread form by a driven rubber roller arrangement 15, which is provided in the upper region of the frame 5. In order to achieve a constant pull-off force, the goods 1 can be guided in front of the rubber roller arrangement 15 via a dancer roller 16 with an adjustable clamping force provided after the upper spreader head 11 '. After the roller arrangement 15, the goods 1 are guided over a fold layer 17 arranged in the upper frame area and deposited in a container 18 in a paneled manner. It is also conceivable, instead of destacking the goods moist, to feed them to a dryer after the squeezing process.

The device according to the invention is to be explained in more detail below.

The device is accommodated in a frame, as shown in FIGS. 1 to 3 and 4 to 5. The frame 5 has in the lower part a container 14 for wet treatment of the tubular goods, the so-called liquor container. The goods are stored wet treated in trough 3. In the lower part of the frame 5, a carrying and adjusting device 22 is provided for the lower spreader head 11. This carrying device can raise or lower the lower spreader head 11 in the direction of the double arrows 26. Thus, the device carrying the lower spreader head 11 can adjust the height of the telescopic central support 19 with its lower and upper support 20, 21. This support device 22 for the spreader head 11 'provided there could also be arranged in the upper part of the frame 5. The detailed structure and the interaction of the individual elements of the carrying device is not essential to the invention and is therefore not described in more detail here. The squeezing device according to the invention is arranged within the frame 5. Its central support 19 consists of a central guide piece 23 and an upper support part 19a and a lower support part 19b guided thereon. The guide piece and support parts can be tubular, for example. On the upper support part 19a and on the lower support part 19b, the relevant supports 20, 21 are provided in a transverse plane distributed over the circumference of the support parts 19a, 19b. Each of these supports 20, 21 carries at its free end an arcuate support arm 24, which in turn receives at its free ends the one axis end of each squeeze roller pair forming pinch rollers 25, while the support arm 24, not shown, of the lower support 20 supports the other axis end of the respective one Pinch roller 25 takes. An associated lower support arm 24 is assigned to each of the upper support arms 24.

Both support arms together take up two inner squeeze rolls 25, which together form an inner pair of squeeze rolls. The lower and upper supports 20, 21 thus, together with the support arms 24, establish a connection to the inner squeeze rollers 25, via which the tubular fabric 1 is guided. Due to the telescopic support 19, which supports articulated, ie rotatably and pivotably, supports 20, 21 on the lower and upper support parts 19b, 19a and the aforementioned stroke adjustment in the direction of the double arrow 26, the inner pinch roller pairs can be adjusted to the necessary diameter of the tubular goods 1 can be set. Each inner squeeze roller pair is assigned a rotationally driven outer squeeze roller 27, which can be set on the inner squeeze roller pair in a horizontal plane and cause the tube 1 to be squeezed. The device designated as the outer nip roller system is now characterized in that the functional area of the carrier device 19 consists of two bearing rings 29, 29 'which are rotatably mounted around the carrier device 19 in the direction of the arrow 28 (FIG. 4) and are provided with only an external toothing 30,30'. exists and wherein both bearing rings 29, 29 'have a common drive 31. One of the bearing rings 29, 29 'is arranged below the functional area, while the other bearing ring is arranged above the functional area of the carrier device 19 and is rotatably received, for example, between roller guides 32, which are carried by arms 33 pointing into the frame interior. Each of the bearing rings 29, 29 'engages with a pinion 34, 34' via its external toothing 30, 30 '. The pinions 34, 34 'are connected via a vertically extending shaft 35 to a motor drive 31 connecting the shaft 35 via coupling 36. The lower and upper bearing rings 29, 29 'have the inner diameter on a pitch circle at a mutual distance from one another
arranged bearing eyes 37, on each of which a pivot lever 38 carrying the outer nip roller 27 is rotatably mounted. Each of the swivel levers 38 is connected to a device 39 controlling the swivel movement of the swivel levers 38 and the contact pressure to be applied to the pinch roller pairs 24, for example a preferably pneumatically operated piston-cylinder unit. These devices 39 are supported on the relevant bearing ring 29, 29 'and are rotatably supported on the same at the same time.

In order to be able to continuously pull off the tubular knitted fabric during the squeezing, each pair of inner squeeze rollers 25 and the respective outer squeeze roller 27, which together form the so-called squeeze mechanism 13, are inclined at an angle α to the vertical, as shown in FIG. 6 for only one of the outer nip rollers 27 is shown. A further bearing ring 40, which is arranged circumferentially above the bearing ring 29 'and is also guided vertically between rollers 32' arranged on the frame 5, has external and internal teeth 41, 42. The serration 41 is in engagement with a pinion 44 driven by a motor 43. Further pinions 45 engage in the internal toothing 42, each of which is supported by a shaft 46 received in the bearing eye of the upper bearing ring 29 ′. At the free end, above the pinion 45, the shaft 46 carries a pulley 47.
Also a pulley 48 carries the free end of the upper pinch roller stub, the pinch roller 27 received by the pivoting lever 38 'of the bearing ring 29'. Both pulleys 47, 48 are connected to one another via a V-belt 49. As already stated, all of the squeezing rollers 25, 27 cooperating for the purpose of goods removal are at an angle α to Vertical inclined in the same direction. With, for example, a squeeze roll inclination of 10 ^o and with tubular goods of 1 m width (measured flat) and also at 60 rpm of the outer and inner squeeze systems which set the bearing rings 29, 29 'in rotation, a goods take-off speed of 20 m / min is achieved. Each section of goods runs about 10 times through a pinch column of each pinch mechanism 13.

In order to prevent the tubular goods 1 from being set in rotation with the squeezing units, each of the outer squeezing rollers 27 is driven by the aforementioned separate drive system starting from motor 43, in such a way that the outer squeezing rollers 27 roll on the tubular goods 1. The outer nip rollers 27 are therefore driven in opposition to the rotational movement of the inner system due to the rotation imposed on the inner nip roller system by the outer system. The directions of rotation are indicated here by the corresponding arrows in FIG. 4.

The motor 43 is electrically coupled to the drive 31, expediently by means of a frequency control (not shown in more detail). As a result, tolerances resulting from the rotation of the inner and outer squeeze systems with respect to the rotation of the separately driven outer squeeze rollers 27 can be compensated for. The tubular fabric 1 is thus kept free of rotation during the squeezing and the continuous withdrawal. This readjustment can be done manually or automatically. DRAWING LEGEND 1 Tubular goods 29.29 ' Bearing ring 2nd Turntable 30.30 ' External teeth 3rd trough 31 drive 4th Turnbuckle 32 Roller guide 5 frame 33 poor 6 Unraveling head 34.34 ' pinion 7 Flat spreader 35 wave 8th Deflection roller 36 clutch 9 Fixing rollers 37 Bearing eye 10th Deflection roller 38.38 ' Swivel lever 11.11 ' Spreader head 39 Facility 12.12 ' Support rollers 40 Bearing ring 13 Crushers 41 External teeth 14 Fleet tank 42 Internal teeth 15 Roller arrangement 43 engine 16 Dancer roller 44 pinion 17th Folders 45 pinion 18th container 46 wave 19th carrier 47 Pulley 19a Carrier part 48 Pulley 19b Carrier part 49 V-belts 20th Support 21 Support 22 Carrying device 23 Guide piece 24th Beam 25th Nip roller 26 Double arrow 27 Nip roller 28 Arrow direction

Claims (15)

A method for avoiding bow markings in wet-finished tubular knitted fabric, according to which sheeted as well as strand-like tubular fabric soaked in liquor is fed to a squeezing device in the spread state, characterized in that the tubular knitted fabric is first transferred from a flat-spread state to a spatial spread, for example triangular spread is and the tubular goods are squeezed all around with simultaneous continuous removal of goods after reaching the space-spreading area, and the undamaged tubular goods are subsequently subjected to a drying process and deposited or subjected to further treatment. Device for carrying out the method according to claim 1, characterized by a) an externally held, rotating, adjustable outer system of inner squeeze roller pairs (25) over which the tubular fabric (1) is guided, b) a central, telescopic support (19) with radially expandable and adjustable arranged, the squeeze roller pairs (25) carrying lower and upper supports (20, 21), c) an externally held, rotating system of outer nip rollers (27) adapted to the circumference of the inner system of nip roller pairs (25), d) a plurality of pivot levers (38) contained in the system of the outer squeeze rollers (27), one of which in each case receives an outer squeeze roller (27) so that it can rotate and pivot, e) a drive device (40, 43, 44, 45, 46, 47, 48, 49) connected to the outer squeeze rollers (27), f) a device (39) which can be advanced to the respective inner pair of squeeze rollers (25) and which influences the nip roller nips (39), g) a common inclination of the inner squeeze roller pairs (25) and the outer squeeze rollers (27) relative to the vertical angle α. Device according to claim 2, characterized in that the inner system consists of pairs of squeeze rollers (25) a) the lower and upper supports (20, 21) arranged rotatably about the guide piece of the central support (19), b) at the free end of the supports (20, 21), an arched support arm (24) and c) the pinch rollers (25) which are rotatably mounted on each free end of the support arms (24) and form a pair of pinch rollers. Device according to claim 2, characterized in that the carrier (19) of the inner system of pinch roller pairs has a pair of support rollers (12, 12 ') at each of its two outer ends, which supports against a pair of fixing rollers (9, 9) arranged outside the tubular fabric (1). 9 ') and clamps the central support (19) between them. Device according to claim 4, characterized in that at least one of the pairs of fixing rollers (eg 9) is adjustable in the longitudinal direction of the carrier (19). Device according to claims 2 to 5, characterized in that the carrier parts (19a, 19b) of the carrier (19) can be locked against one another in any working position. Device according to claim 2, characterized in that the system of the outer nip rollers (27) consists of a) a lower and upper bearing ring (29, 29 ') which delimits the pinching area in the vertical direction and has external teeth (30), b) a drive device (31, 34, 34 ', 35, 36) connecting the two bearing rings (29, 29') and each bearing ring (29, 29 ') has the swivel levers (38) for the delivery of the respective nip rollers (27) the respective pinch roller pair (25) carries. Device according to claim 7, characterized in that the bearing rings (29, 29 ') via pinions (34, 34') and a vertically extending shaft (35) connecting the pinions (34, 34 ') with the drive (31) a coupling (36) is connected. Apparatus according to claim 8, characterized in that the lower and upper pivot levers (38, 38 ') carrying the outer squeeze rollers (27) are arranged diametrically opposite on the lower and upper bearing rings (29, 29') offset by an angle of rotation α. Apparatus according to claims 2 and 9, characterized in that the device (39) actuating the pivot levers (38, 38 ') is arranged to be supported on the lower and upper bearing rings (29, 29') and with the respective pivot lever (38, 38) ') is connected. Apparatus according to claim 2, characterized in that a further bearing ring (40) with external and internal teeth (41, 42) above the bearing ring (29 ') is rotatably supported from the outside between support rollers (32') and with one of a drive motor (43) driven pinion (44) is connected. Apparatus according to claim 11, characterized in that a shaft (46) connected to the upper bearing ring (29 ') and which serves at the same time for mounting the pivoting lever (38') carries a pinion (45) which is connected to the internal toothing (42) of the bearing ring (40) is engaged. Device according to claim 12, characterized in that the shaft (46) carries a pulley (47) at the upper free end. Apparatus according to claim 2, characterized in that the outer squeeze rollers (27) carry a pulley (48) in the region of their connection to the swivel lever (38 '). Device according to claims 13 and 14, characterized in that the belt pulleys (47, 48) are connected via V-belts (49).

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