CZ2005302A3 - Circular knitting machine provided with device for knitted fabric wide draw-off - Google Patents

Abstract

The present invention relates to a circular knitting machine by means of a wide draw-off device comprising at least two driven draw-off rollers (2), between which a tubular knitted fabric is pulled over the spreader from the knitting means of the machine. A device for longitudinally slitting the tubular netting (1) is situated above one of the spreader ends (2) in the area of the one end of the spreader (2), and spreader rods (4) arranged in the "V" are situated underneath the exhaust spar (2). In the direction of movement of the knitting downstream of the spinning rods (4), expanding / or pulling and / or pulling and / or winding means of the knitted fabric are provided in full width, and the drawers (2) are on the side opposite the side above which the longitudinal device is situated cutting the tubular knitted fabric by providing an axial circumferential interruption of its exhaust surface, the local interruption being arranged below the second end of the expander and above the top of the expanding rods (4).

Description

Circular Knitting Machine with Wide Knitting Device • · 999 9 99: PS344PIZ

9 9 9

99999 99 ···

Technical field

BACKGROUND OF THE INVENTION The invention relates to a circular knitting machine with a wide knitting-off device comprising at least two driven draw-off rolls between which a tubular knitted fabric is pulled over the spreader from the machine's knitting means. and underneath the take-off rollers there are situated "V" opening rods for opening the lengthwise slit of the knitted fabric to its full width, with expanding and / or pulling and / or guiding and / or winding means of the knitted fabric being arranged in the full width .

BACKGROUND OF THE INVENTION

Circular knitting machines producing tubular knitted fabric in a known manner are well known. The knitted fabric is then stretched to a flat closed shape by means of a span and is clamped in the form of a flat tube by the parallel draw-offs of the draw-off system and withdrawn therefrom from the machine's knitting system and wound on the winding bar. Upon completion of the winding after the production of a sufficient length of tubular knitted fabric, the winding rod with the tubular knitted fabric is removed from the machine, the knitted fabric is cut longitudinally during or after processing outside the machine, stretched to full width. a full-width knitted fabric package for further processing.

This traditional process has a serious disadvantage in the manufacture of knitted fabrics containing elastic, e.g. elastane, fiber. Indeed, in places where the tubular knitted fabric is folded during retraction and winding in a tubular shape, a fold is formed which cannot be removed from the knitted fabric in any way, whereby the knitted fabric is partially degraded.

This disadvantage is overcome, for example, by the method and the machine operating according to the method described in EP 0 456 576 B1. According to this method, tubular * φ ·· φ φφ ······ φ ··· ·····.

• The knitted fabric is initially formed into a substantially flat tubular shape by the spreader and parallel splitting rollers, laterally sliced at the side, and opened under the splitting rollers by means of opening rods arranged in the " V ". Subsequently, the longitudinally cut knitted fabric passes through a system of expanding and withdrawing rollers arranged perpendicular to the direction of the splitter rollers and extending the knitted fabric to the full width, and the knitted fabric is pulled in full width and wound onto the winding bar.

The method of EP 0 456 576 B1 currently operates most of the known machines with cutting the tubular knitted fabric and winding the knitted fabric in full width. Parallel splitters are generally non-driven, are freely rotatable and spaced between them a few centimeters to avoid pinching the edges of the flat tubular knitted fabric and creating an undesirable fold. The wound fabric package on the winding rod lies on its own weight on the drive roller and is thereby driven in a rotary winding motion.

A disadvantage of the method and machines of EP 0 456 576 B1 is that the draw-off rollers are located downstream of the non-driven splitter rollers and non-rotatable opening rods, which requires a considerable force exerted by the draw-rollers as well as a large number of expansion and draw-off rollers. A further disadvantage is that the tension in the wound fabric instead of the winding on the winding rod is largely determined by the frictional force between the winding roll and the knitted fabric, which force increases with increasing weight of the fabric and therefore decreases the width of the fabric , which is undesirable. A further disadvantage is that due to the non-negligible effect of friction in the passive pulling of the knitted fabric through the hub rollers and through the opening rods, the tension in the knitted fabric at the point of its withdrawal from the knitting system is not precisely defined.

Furthermore, EP 0 696 658 A1 discloses a solution in which the tubular knitted fabric is pulled by three driven take-off rollers, under which a cutting device and, in the middle, a cutting device and also a full-width knitting device are situated in the middle of the width of the flat tubular knitted fabric. This solution, however, does not prevent the formation of a fold in the knitted fabric, since the edges of the knitted fabric are clamped between the take-off rolls. Another disadvantage is the large built-up height, so this principle has not found practical application.

• W · * ··; : PS544CjCZ;

• 9 · «• Μ Μ Μ Μ Μ 9 Μ Μ Μ

An improvement of the method and machines according to EP 0 456 576 B1 is the solution described in EP 1 335 056 A1. The hubs between which there is a gap and therefore do not grip the tubular knit and do not form a knit on the knit are driven there and, due to the limited knit wrap, exert some tension on the knit, thereby reducing the effect of friction on the pull bars. However, due to the gap between the hub rollers and the relatively small knitting angle of the knitted fabric, the pulling force of the hub rollers is not sufficiently high and it is therefore necessary to use other full-width draw rollers with a large wrapping behind the rollers. This makes the entire system of exhaust and expansion rollers relatively complex, which is disadvantageous both in terms of production costs and in terms of machine operation.

It is well known to those skilled in the art that in regions where the knitted fabric completely leaves the expanding roll, its asymmetric elasticity causes the edge to wrap, resulting in an increase in the knitting diameter of the knitted fabric at its edges and an uneven winding. In most of the known practical solutions, therefore, the edge is unfolded by a stream of compressed air immediately before being wrapped. A steady flow of air leads to a large increase in air consumption and a considerable increase in investment and operating costs. Therefore, users often turn off this deployment, resulting in the aforementioned disadvantages.

It is an object of the invention to overcome or at least minimize the disadvantages of the prior art.

SUMMARY OF THE INVENTION

The object of the invention is achieved by a circular knitting machine with a wide knitting-off device, characterized in that the draw-off rolls are provided on the side opposite to the side over which the longitudinal cutting device of the tubular knitted fabric is located. is arranged below the other end of the spreader and above the top of the opening bars.

This allows a simple and efficient removal of the knitted fabric without the formation of folds in the knitted fabric, in addition with a high-quality and stable removal of the knitted fabric from the machine's knitting means.

· »··

9,999 • 9,9

9 9

999 99

According to one preferred embodiment, at least one driven expanding roller provided with a left and right helix for expanding the knitting width is situated in the direction of movement of the knitting behind the opening rods and the full-length knitting winding device comprises at least one driven driving roller mounted on the swinging arms and wrapping the knitted fabric on a winding rod freely rotatably mounted in the construction of the apparatus for wide knitting removal.

In this case, it is advantageous if, in the direction of movement of the fabric, immediately before the drive roller, the last driven expansion roller provided with a left and right helix is rotatably mounted on the swinging arms carrying the drive roller for expanding the knitted fabric and expanding the wound edges of the knitted fabric.

According to a further preferred embodiment, at least one driven expanding roller provided in the direction of movement of the knitted fabric is provided with a left and right helix for expanding the knitted fabric in width and the full-length knitting winding device comprises at least one driven driving roller which is situated under the knitting wrap a rod freely rotatably mounted in the structure of the apparatus for a wide take-off of the knitted fabric, wherein the wrap of the knitted fabric lies on a drive roller coupled to the drive.

For the operation of the device, it is advantageous if the driven rollers are connected to a control device for constant torque control.

According to a further preferred embodiment, the driven rollers are connected to a speed control device linearly proportional to the speed of the torque limiting machine.

According to further preferred embodiments, the driven rollers are coupled individually or in sections to separate electric drives with electronic control.

To avoid scrolling the edges of the knitted fabric before being wound onto the winding bar, it is advantageous if at least one mechanical expansion element is provided in the region of the passage of each of the knitting edges in the region of the passage of each knitting edge immediately upstream of the winding devices and / or before the last expanding roll. the wound edge of the knitted fabric before being wound onto the knitted fabric.

999: ps 440 440gz;

• · · · · · · · · ·

In this case, it is advantageous if the mechanical expanding element is formed either by a standard spreader for the looms and / or by at least one element with at least one edge lying in the plane of the knit and directed obliquely to the center of the knit against the direction of movement of the knit and touching the knit.

In order to improve the function of the mechanical expander, it is advantageous if a support element having a planar abutment surface parallel to the knit is arranged opposite the mechanical expander.

According to a further preferred embodiment, the mechanical expanding element is provided with obliquely directed grooves and / or longitudinal openings arranged in the knitting contacting surface, the edges formed by said surface and said grooves and / or openings being directed obliquely to the center of the knitting in a direction opposite to the knitting movement.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is schematically shown in the drawing, wherein FIG. 1 shows an arrangement of an exemplary embodiment of a circular knitting machine with a device for wide knitting removal; FIG. 2 a view of the arrangement of FIG. 1 in the direction of the arrow X, FIG. 2a an exemplary embodiment with a guide roller situated on the swinging axis of the rocker arms, FIG. 2b another exemplary embodiment with a guide roller on the swinging axis of the rocker arms and an additional expansion roller; 3 shows a view of the arrangement of FIG. 1 in the direction of the arrow Y showing a detail of the last expanding roll and the driving roll with mechanical expanding elements; FIG. and Fig. 4 is a view of the arrangement of Fig. 1 in the direction of arrow Z showing a detail of the mechanical expander element with obliquely arranged openings.

Examples of small cows

Circular knitting machine with a wide fabric take-off device comprises known means for producing tubular knitted fabric JL

: ps35 «ogz:

The tubular knitted fabric 1 is guided from the machine knitting means (not shown) in the direction of the arrow A via a suitable expanding device by means of which the tubular knitted fabric is shaped in a known manner first into a rectangular or square cross-section and then into a flat formation. The rolls 2, which grip the knitted fabric between them and by their rotation pull it away from the knitting means of a circular knitting machine.

At one edge of the flat knitted fabric formation, the take-off rolls 2 are provided with a local circumferential interruption of their take-off surface, e.g.

circumferential grooves 20, or there is a localized interruption of the take-off rollers 2 in another suitable manner, or its diameter is reduced at this point, etc. Above this local circumferential interruption of the take-off rollers 2 there is one end of the expander so that through another local interruption of the draw-off surfaces of the draw-off rollers 2, one edge of a flat tubular knitted fabric is passed without being clamped by the draw-off rollers 2, thereby forming a rounded shape 201 between the lower rounded end of the expander situated above the draw-off rollers 2 and the rounded top of the below the take-off rollers 2, so that at this edge of the flat knitted fabric formation, the passage of the take-off rollers 2 does not result in an undesirable fold, in particular for knitted fabrics with elastic fibers, e.g. In the case not shown, the local circumferential interruption of the draw-off surface of the draw-off rollers 2 is formed up to the proximal end of the draw-off rollers 2.

On the other edge of the flat knitted fabric formation above the take-off rolls 2 there is a device for longitudinal cutting of tubular knitted fabric 1 containing e.g. a suitable knife 3, by which the tubular knitted fabric 1 is cut at this edge of the flat knitted fabric. , so that even at this edge of the flat knitted fabric formation an undesirable fold is not formed.

The take-off rollers 2 are formed in a suitable manner, for example, they are integral with a fixed circumferential groove 20 or other local interruption around the periphery at one edge of the flat knitted fabric, or the take-off rollers 2 are known in the known manner with sliding segments which are threaded. · · ·

· ..: ps3Mqgz:: ···.

and the sliding segments are lockable in a selected position so that the necessary grooves 20 can be formed between adjacent segments at any point in the length of the sliding rolls 2 and at any length as desired. The draw-off rollers 2 with grooves 20 or circumferential interruptions may also be formed in any other suitable manner so as to provide space for passing the edge of the knitted fabric and avoiding its squeezing and folding.

The take-off rollers 2 are rotatably mounted in a wide knitting-off device (not shown) and are coupled with a suitable drive, e.g. one of the take-off rollers 2 is coupled to one end with a separate electric drive 21 and provided with a gear 22 at its other end. It engages a gear 22 at an adjacent end of the second take-off roller 2. The take-off rollers 2 are coupled to a knitting machine drive or not coupled to a drive of other elements of a wide knitting machine, etc. other elements of this device are stored and this structure is known to the skilled public rotatably in the frame of the machine rotatable about the vertical axis of the machine and also connected in a known manner with arms (not shown) to the roller needle bed carrier and around the vertical axis of the machine.

Under the draw-off rollers 2, there are arranged known opening rods 4 arranged in a "V". The unlinked edges of the flat knitted fabric passing through the local interruption of the take-off rolls 2 pass over the top of the opening rods 4, each of the knitting arms formed by cutting the tubular knitted fabric through a cutting device in a known manner through one from the opening rods 4, whereby the originally tubular knitted fabric 7 is opened to its full width after its longitudinal cutting. The opening rods 4 may be fixed or rotatable about their longitudinal axis, etc. The pivoting opening rods may also be coupled to the drive.

Open to its full width, the knitted fabric passes from the opening rods 4 through a first expanding roll 5 which belts and is further guided to the winding device 6 of the full width of the knitted fabric. The first expansion bar 5 is rotatably mounted in the construction of the wide device

knitting removal, and can be coupled to the drive. The first expanding roll 5 is provided at least one expanding helix at each half of its length which, when the first expanding roll 5 is rotated, acts on the knitted fabric away from the middle of the first expanding roll 5 towards its ends, thereby keeping the knitted fabric wide and partially thereby eliminating longitudinal scrolling of the knitted fabric from the edges. In order to achieve maximum expansion effect, the first expansion roll 5 is preferably rotated at a peripheral speed higher than the knitting withdrawal speed.

The full width weave winding device 6 in the illustrated embodiment includes a winding bar 60 rotatably mounted in the construction of a wide fabric take-off device to which the knit fabric 601 is wound. A drive roll 61 is rotatably mounted along the take-up bar 60, which rests longitudinally against the surface of the knitted fabric pack 601, and which is coupled to the drive and rotates to drive the knitted fabric pack 601 and wind the fabric. In the embodiment shown in FIGS. 1, 2, 2a, 2b, the drive roller 61 is supported on the swing arms 62, thereby allowing a continuous change of the position of the drive roller 61 as the diameter of the knitted fabric wrap 601 increases by winding the full width of the knitted fabric. knitting, in particular the stability of the knitting wrap circumference speed 601 and the tensile forces in the wound knit. In the illustrated embodiments, the wound knit runs between the knit wrap 601 and the drive roll 61, where the last expansion roll 50 is rotatably mounted upstream of the drive roll 61 with at least one expanding helix at each half of its length to expand the knitted width and unfold the wound edges. Also, the last expansion bar 50 may be coupled to the drive and, in a preferred embodiment, rotates against the direction of movement of the knit, thereby substantially increasing the unrolling efficiency of the edges of the knit. In the preferred embodiment shown in FIGS. 1, 2, 2a, 2b, the last expansion roll 50 is situated on the swing arms 62 supporting the drive roll 61. This achieves a constant and short length of knitted section between the last expansion roll 50 and the knitted fabric 601, thereby minimizes the rewinding of the edges of the knitted fabric after leaving the last expanding roll 50. Further, the tensile force in the knitting between the last expanding roll 50 and the previous expanding roll pushes the drive roll 61 to the knitted fabric 601, thereby maintaining the winding force and thus constant value.

• it · it

: ps3Píqgz:

• · · · · to · to ·

Between the first expander roll 5 and the last expander roll 50, an additional expander roll 51 may be rotatably mounted in the construction of the wide knitting removal device 51. as shown in Figures 1, 2, 2a, 2b, 2c, with at least one expander helix on each half its length. Also additional expansion cylinder

51 may be coupled to the drive. In the preferred embodiment shown in FIG. 2a, a guide bar 52 is situated on the swing axis of the rocker arms 62, which maintains a constant wrapping angle of the last expansion bar 50. This guide bar 52 is complemented with an additional expansion bar 51 in the embodiment of FIG.

In the embodiment shown in Fig. 2c, the winding device 6 may comprise a winding bar 60 with a knitted fabric pack 601 lying on the driving roll 61, which is coupled to the drive. The knitted fabric is guided and expanded in the section between the opening rods and the drive roller by a system of guide and expansion rollers 52, 51.

In another embodiment (not shown), the machine may be provided with a different number of expanding rollers, some of which may comprise two or more expanding helices for each half of its length.

In another embodiment (not shown), the machine comprises other types of rolls, such as drawing, guiding, etc., in the section between the opening bars 4 and the winding device 6, so that the full-width winding characteristics of the knitted fabric can be adjusted in more detail. The individual rollers may be provided with their own drive, or they may be grouped into sections of at least two rollers driven by a common drive, etc.

According to one preferred embodiment, the drive of the individual rolls is controlled to a constant torque. In the case of dividing the rolls into sections, each section of the rolls can be controlled to a constant torque. Advantageously, separate electric drives with electronic torque control can be used to drive the rolls or sections of the rolls. In the embodiment shown in FIG. 1, the expansion rollers 5, 50, 51 and the drive roller 61 are driven by a chain drive comprising a chain 630 driven by an electric drive 63. In the not shown example, the torque distribution to the individual rollers 5, 50, 51,

52, 61 etc. by other suitable means, or is divided into several branches, which may include separate motors, etc.

• · · ·. : páŽHeoz?

····· · · · ··· ·· ·· ··· ·· ···

In another embodiment, the control of the drives of the individual rolls and / or of the individual sections of the rolls may be performed with a linear speed and / or positional relationship to the machine speed supplemented by a torque limitation.

In a further embodiment (not shown), the knitting winding device 6 is arranged in full width in the direction of knitting movement 5 immediately after the opening rods 4.

In the direction of movement of the fabric immediately in front of the fabric winding device, suitable mechanical expanding elements 64 are situated to unwind the wound edge of the fabric before being wound into the fabric wrap 601 on the winding bar 60. These mechanical expanding elements 64 may be as shown in detail in FIG. and 4, such as standard spacers 641 for weaving looms, etc. Mechanical expanding elements 64 may also be formed by elements 642 with at least one edge lying substantially in the plane of the knit and directed obliquely to the center of the knit against the direction of movement of the knit and touching the knit. To improve the function of the mechanical expander elements 64, support elements 643 are provided opposite the mechanical expander elements 64 on the other side of the knitted fabric with a planar support surface substantially parallel to the knitted fabric. The mechanical expanding element 642 may be provided with obliquely directed grooves and / or longitudinal openings 6421 disposed in the knitting contact surface, the edges 6422 formed by said surface and said grooves and / or openings 6421 directed obliquely to the center of the knitting in a direction opposite to the knitting movement. The mechanical expander element 64 may also be provided with two faces contacting the fabric from both sides and / or having a small distance so that the gap may pass through the fabric but avoids re-rolling the edge of the fabric after unfolding by the last expanding roll 50 as shown in FIG. 2c.

The invention is not limited to the explicitly described or depicted embodiments, as it is within the ordinary skill in the art to modify the described and depicted embodiments based on the inventive idea contained herein.

Claims (13)

1. Circular knitting machine with a wide knitting-off device comprising at least two driven draw-offs between which a tubular knitted fabric is clamped 5 being pulled over the spreader from the machine's knitting means, wherein a tubular knitting device is located above the take-off rolls in the region of one end of the spreader and below the take-off rolls there are situated "V" opening rods for opening the longitudinally cut knitted fabric. the direction of movement of the knitting behind the opening rods are 10, the expanding and / or tensioning and / or guiding and / or winding means of the knitted fabric are provided in full width, characterized in that the draw-off rollers (2) are provided on the side opposite the side over which the longitudinal slit device is located circumferentially interrupting its withdrawal surface, the local interruption being arranged below the other 15 at the end of the spacer and above the top of the opening bars (4). Circular knitting machine according to claim 1, characterized in that at least one driven expanding roller (5, 50, 51) is provided in the direction of knitting movement behind the opening rods (4) provided with a left and right helix for stretching The wide knitted fabric and the full-length knitting device (6) of the knitted fabric comprise at least one driven drive roller (61) mounted on the swinging arms (62) and pressed from above onto the wrap (601) of the knitted fabric on the winding bar (60) freely rotatable construction of a device for a wide take-off of the knitted fabric. 25 Circular knitting machine according to claim 2, characterized in that in the direction of the knitting movement, the last expansion roll (50) provided with left and right rotationally mounted on the rocker arms (62) carrying the drive roll (61) is immediately pivoted in front of the drive roll (61). a helix for expanding the knitted fabric to the width and unfolding the folded edges of the knitted fabric. : pS3 * Wqgz: Circular knitting machine according to claim 1, characterized in that at least one driven expanding roller (4) is arranged in the direction of knitting movement behind the opening rods (4). 5, 50, 51) provided with a left and right helix for expanding the knitted fabric to a width and the full-width knitting winding device (6) comprises 5 at least one driven drive roller (61) which is situated under the knitted fabric (601) on the winding bar ( 60) freely rotatably mounted in the construction of a wide fabric take-off device, wherein the knit fabric wrap (601) lies on a drive roll (61) coupled to the drive. Circular knitting machine according to any one of claims 1 to 4, characterized in that the driven rollers are connected to a constant torque control device. The circular knitting machine according to any one of claims 1 to 4, characterized in that the driven rollers are connected to a speed control device linearly proportional to the speed of the torque limiting machine. Circular knitting machine according to any one of claims 1 to 6, characterized in that the driven rolls are individually coupled with separate electric Drives with electronic control. Circular knitting machine according to any one of claims 1 to 6, characterized in that the driven rollers are coupled in sections to separate electric drives with electronic control. Circular knitting machine according to any one of the preceding claims, characterized in that in the direction of movement of the knitted fabric behind the opening rods (4) and immediately before the winding device (6) and / or before the last expanding roll (50), knit edges arranged at least 30, one mechanical expander element (64) for unfolding the wound edge of the knitted fabric before being wound onto the knitted fabric (601). • • • ·. . SPSSWOZ · • ·· 10. Circular knitting machine according to claim 9, characterized in that the mechanical expanding element (64) is formed by a standard spreader (641) for weaving looms. The circular knitting machine according to claim 9, characterized in that the mechanical expander element (64) is formed by at least one element (642) with at least one edge lying in the plane of the knit and directed obliquely to the center of the knit opposite the direction of movement of the knit and touching the knit . Circular knitting machine according to claims 9 to 11, characterized in that a support element (643) having a planar support surface parallel to the knit is arranged opposite the mechanical expanding element (64) on the other side of the knitting. Circular knitting machine according to one of Claims 9 to 12, characterized in that the mechanical expansion element (64) is provided with obliquely directed grooves and / or longitudinal openings (6421) arranged in the knitting contacting surface, the edges (6422) ) formed by this area and said The grooves and / or openings (6421) are directed obliquely to the center of the fabric in a direction opposite to the movement of the fabric.