EP0749503B1 - Spreader for knitting machines - Google Patents

Abstract

A spreader is disclosed for a knitting machine with movable knockover bits provided with a stiff holding section (1, 1') for holding the spreader on the knitting machine and with an elongated vertical guiding section (5, 5') for carrying away the knitted goods. An elastic section (E) is arranged in the working area of the movable knockover bits between the stiff holding section (1, 1') and the elongated vertical guiding section (5, 5'). The elastic section (E) is horizontally deflected when pressed by a knockover bit, in particular laterally to the pressure direction. Damages to the knockover bits are thus excluded when the point of penetration of the bit is incorrectly positioned in the spreader, and the smallest possible distance between the knockover bits is not limited by the geometric design of the spreader.

Description

The invention relates to a spreader for a knitting machine with movable knock-off boards, which has a rigid holding section for holding the spreader on the knitting machine and an elongated, vertically arranged guide section for discharging the knitted fabric, and a holding device for guiding the guide section in an area below the center of the guide section having.

Such a spreader device for a knitting machine with movable knock-off boards is shown, for example, in the machine manual CMS 400 selectanit knitting machine systems from H. Stoll GmbH & Co., Reutlingen, from 1988 on drawing sheets 203 205 to 203 207.

Such a plug-in spreader, which is held from below, with two strip plates and one longitudinal slot in each case in the working area of the movable knock-off boards is used for hanging up to the edge, for predominantly single-surface knitted fabrics and for processing synthetic yarns. As a rule, the knitting machine is equipped with a spreader on the left and a spreader on the right side of the needle bed. Each spreader is assigned a counterholder as a guide on the lower part of the vertical guide section. The counter-holder is provided with a guide channel and with guide elements which, arranged at a certain distance, leave a gap between three staggered guide rollers. The guide section held in the counter holder allows the knitted edge to pass through, but prevents the guide section of the spreader from evading laterally. When changing the fabric widths, the spreader device and counter bracket must be adjusted at the same time.

The main purpose of using a spreader device is to prevent the vertical edges of the knitted fabric from bulging towards the inside of the knitting machine due to the pulling force of the knitted fabric being drawn off. The spreader ensures that the respective edge of the knitted fabric vertically straight down runs.

A main disadvantage of the known spreader devices is that the puncture of the edge of the last active tee-off board in the spreader must be positioned extremely precisely, otherwise the corresponding, movable tee-off board does not hit the vertical slot provided in the guide section for the engagement of the board, but against the guide section strikes and is damaged or destroyed. In addition, in the known spreader device, the smallest possible spacing of the tee-off boards is limited by the width of the webs delimiting the slot in the spreader. Such a spreader can no longer be used with finer knitted fabrics, which in turn leads to the above-mentioned bulging of the knitted edges inwards.

In older knitting machines that do not yet have any movable knock-off boards, spreader devices are also known. For example, in GB-A-2 175 613 or in DE-A-1 947 007 knitting machines without movable knock-off boards are described. In addition, such a spreader device is shown in the machine instructions ANVH-B from H. Stoll GmbH & Co., Reutlingen, from 1969 in drawings No. 72 602/603 and 55 857/858. This known spreader essentially consists of a rigid support section arranged at the top and a vertical guide section in the form of a spring steel wire. With this old spreader device, the problems described above with the exact positioning or the risk of damage to the tee-off boards could not occur, since the old knitting machines had no movable tee-off boards. On the other hand, the old spreader devices cannot be used on modern knitting machines with movable ones Tee boards are used.

In contrast, the object of the present invention is to present a spreader for a modern knitting machine with movable knock-off boards, in which damage to the knock-off boards can be ruled out if the plate is not correctly positioned in the spreader, and in which the smallest possible distance between the knock-off boards cannot be avoided the geometric structure of the spreader is limited.

According to the invention, this object is achieved in that between the rigid mounting section and the elongated, vertically arranged guide section, an elastic section is provided in the working area of the movable tee-off boards, which can deflect in a horizontal direction, in particular laterally to the printing direction, when pressure is applied by a tee-off board.

The possibility of horizontal deflection of the elastic section does not endanger the tee boards even if the puncture is inaccurately positioned. Damage is excluded due to the elasticity of the spreader in the work area.

In a particularly preferred embodiment of the spreader according to the invention, the elastic section is formed by a bundle of fibers with high tensile strength, which are firmly anchored on the one hand on the holder section and on the other hand on the guide section. The tensile strength of the fiber bundle should be at least so large that masses between 10 and 60 kg can be carried. The moveable Tee-off boards can then easily push adjacent fibers to the left and right when entering the work area and run a path between the fibers without fear of damage to the tee-off boards.

The fibers can also form a unit in the rotated version and be pushed as a whole to the left or right.

In further developments of this embodiment, the fibers are preferably synthetic fibers, since their elasticity and tensile strength can be substantially greater than that of natural fibers.

Synthetic fibers can consist, for example, of polyamide, such as nylon, or of aramid, such as Kevlar. An embodiment is also preferred in which the mounting section and / or the guide section consists of plastic, which melts under high heat. As a result, in a further development of this embodiment, the plastic fibers can be welded to the mounting section and / or the guide section.

Another possibility is that the fibers can be firmly clamped in the holding section and / or in the guide section. In this embodiment, the simple interchangeability of the elastic section is particularly advantageous.

In a particularly simple to manufacture embodiment of the spreader according to the invention, the fibers are glued to the mounting section and / or to the guide section.

An embodiment is particularly preferred in which the guide section is cylindrical with a ratio of height to diameter greater than 100, preferably greater than 200. Such an elongated, wire-shaped mounting section is known per se, for example, from the second (= older) document from the Stoll company mentioned above. It has the great advantage that the withdrawal of the knitted goods works perfectly and there is no jamming in transport or in the guide, as can often be the case, for example, with the spreader according to the prior art cited at the beginning.

In a further development of this embodiment, the guide section consists of metal, preferably hardened stainless steel. This ensures the durability of the guide section with optimal functionality at the same time.

An embodiment of the spreader according to the invention is also preferred, in which a vertical longitudinal slot is provided in the elastic section in the working area of the movable tee-off boards, into which a tee-off board can engage. The vertical longitudinal slot per se is already known from the prior art cited at the beginning. It allows the tapping plate to engage in the spreader. In the spreader according to the invention with an elastic section, it is not necessary in this embodiment that the elastic section must deflect as a whole when a striking plate strikes the spreader in the working area. This is particularly beneficial in a finer division of the knitting machine, in which case the tee-off boards are arranged with a smaller mutual distance.

Further advantages of the invention result from the description and the drawing. Likewise, the features mentioned above and those listed further can be used according to the invention individually or in any combination with one another. The described embodiments are not to be understood as an exhaustive list, but rather have an exemplary character.

Fig. 1a

eine schematische Frontalansicht einer Ausführungsform des erfindungsgemäßen Breithalters mit Faserbündeln im elastischen Abschnitt;

Fig. 1b

einen Längsschnitt durch den Breithalter gemäß Fig. 1a;

Fig. 2a

eine schematische Frontalansicht einer Ausführungsform des erfindungsgemäßen Breithalters mit vertikalem Längsschlitz im elastischen Abschnitt;

Fig. 2b

einen schematischen Längsschnitt durch den Breithalter gemäß Fig. 2a;

Fig. 3a

eine schematische Frontalansicht einer Ausführungsform des erfindungsgemäßen Breithalters mit verdrilltem Faserbündel als elastischem Abschnitt;

Fig. 3b

einen schematischen Längsschnitt durch den Breithalter gemäß Fig. 3a;

Fig. 4

eine schematische Frontalansicht einer Gegenhalteeinrichtung für den vertikalen Führungsabschnitt des erfindungsgemäßen Breithalters mit einer schematischen Schnittansicht des Nadelbettes einer Strickmaschine zur Verdeutlichung der Einbaulage;

Fig. 5a

eine schematische Frontalansicht einer Ausführungsform des erfindungsgemäßen Breithalters mit zwei Bändern im elastischen Abschnitt; und

Fig. 5b

einen schematischen Längsschnitt durch den Breithalter gemäß Fig. 5a.

The invention is illustrated in the drawing and is described and explained in more detail using exemplary embodiments. Show it:

Fig. 1a

is a schematic front view of an embodiment of the spreader according to the invention with fiber bundles in the elastic section;

Fig. 1b

a longitudinal section through the spreader according to FIG. 1a;

Fig. 2a

is a schematic front view of an embodiment of the spreader according to the invention with a vertical longitudinal slot in the elastic section;

Fig. 2b

a schematic longitudinal section through the spreader according to FIG. 2a;

Fig. 3a

is a schematic front view of an embodiment of the spreader according to the invention with twisted fiber bundle as an elastic section;

Fig. 3b

a schematic longitudinal section through the spreader according to FIG. 3a;

Fig. 4

is a schematic front view of a counter-holding device for the vertical guide section of the spreader according to the invention with a schematic sectional view of the needle bed of a knitting machine to illustrate the installation position;

Fig. 5a

is a schematic front view of an embodiment of the spreader according to the invention with two bands in the elastic section; and

Fig. 5b

a schematic longitudinal section through the spreader according to FIG. 5a.

The spreader according to the invention shown in FIGS. 1a and 1b for a knitting machine with movable knock-off boards has a rigid holding section 1 at the upper end for holding the spreader on the knitting machine. With the aid of a suitable holding element (not shown in the drawing), the holding section 1 can be hung, for example, into the thread guide rail of the knitting machine, so that the spreader is suspended from above.

The mounting section 1, which can be made of metal or a rigid plastic, closes in the working area of the movable knock-off boards of the knitting machine an elastic section E. The elasticity of the material used for the elastic section E must be at least so great that when the elastic section E is subjected to pressure by a knock-off plate, which takes place essentially in the horizontal direction, an at least partial horizontal deflection of the elastic section E in the area under pressure is made possible.

In the embodiment shown in FIGS. 1a and 1b, the elastic section E is formed by a plurality of elastic fibers 2, which on the one hand at their upper end on the mounting section 1, and on the other hand at their lower end on a receiving part 4 for receiving a wide holding wire 6 for straight , vertical deduction of the edge of the knitted goods are firmly anchored. Viewed from the front in the middle of the spreader, a vertical longitudinal slot 3 is left free in the working area of the movable tee-off boards, into which a tee-off board can engage when it moves towards the spreader from the front or from behind.

If the spreader is not positioned exactly so that the striking plate exactly meets the longitudinal slot 3, then due to the elasticity of the elastic section E, a horizontal deflection of at least part of the elastic section against the horizontal pressure load by the striking plate is achieved, so that the striking plate at Impact on the spreader cannot be damaged. In the exemplary embodiment shown in FIGS. 1 a and 1 b, in which the elastic section E is formed from fibers 2, the horizontal deflection can in particular also take place laterally with respect to the printing direction of the knock-off board, in that the knock-off board fits into the gap between placed two adjacent fibers 2 and if necessary pushes them away to both sides.

As mentioned above, the fibers 2 must have a high tear strength (10-60 kg) and can in particular be synthetic fibers. For example, polyamide fibers, e.g. Nylon, or aramid fibers, e.g. Kevlar. The fibers 2 can be welded to the mounting section 1 and / or the receiving part 4 if the mounting section 1 and / or the mounting part 4 consists of a material that melts under high heat. However, the fibers 2 can also be firmly clamped in the mounting section 1 or the receiving part 4 or can be glued to the mounting section 1 or the receiving part 4. In any case, it must be ensured that the selected connection type has a sufficiently high tensile strength (10 - 60 kg).

In the embodiment shown in FIGS. 1a and 1b, the receiving part 4 and the wide holding wire 6 form a guide section 5, on which the edge of the knitted fabric is guided vertically downward from the working area of the knitting needles and knock-off sinkers. The guide section 5 is preferably cylindrical and has a ratio of height to diameter greater than 100, better still greater than 200. In order to achieve a high durability paired with a high strength, the guide section 5, in the exemplary embodiment of FIGS. 1a and 1b in particular the wide holding wire 6, is made of metal, preferably hardened stainless steel.

In the exemplary embodiment shown in FIGS. 2a and 2b, the elastic section E does not consist of fiber bundles, but in one piece from a suitable, elastic material with high tensile strength, preferably plastic. Viewed frontally in the middle of the elastic section E in the working area of the movable tee-off boards, a vertical longitudinal slot 3 'is again provided, into which a tee-off board can engage. If the spreader has not been positioned precisely enough relative to the tapping plate so that the tapping plate does not exactly meet the longitudinal slot 3 ', the elastic section E, due to its elasticity, at least partially deviates horizontally in the direction of pressure of the tapping plate when it hits it. This will prevent damage to the tee board.

In the upper area of the spreader shown in FIGS. 2a and 2b there is again a rigid holding section 1 ', while in the lower area of the elastic section E an elongated, vertically arranged guide section 5', which in this embodiment is formed by a wide holding wire 6 ' , is recorded.

FIGS. 3a and 3b show an embodiment of the spreader according to the invention, in which the elastic section E is formed by fibers 2 'which are twisted together and form a unit.

An embodiment of the spreader is shown in FIGS. 5a and 5b, in which the elastic section E is formed by two approximately parallel bands 2 ″ made of elastic material, which include a vertical longitudinal slot 3 ″ for engaging a knock-off board. Instead of the bands 2 ″, for example, elastic ones can also be used Cords, especially those made from round material, are used.

Finally, FIG. 4 shows a counter holding device 7 with guide rollers 8 which guide the wide holding wire 6 ″ of the vertical guide section 5 ″ in an area below the center of the guide section 5 ″. The counter-holding device 7 is arranged on a carriage 9, which in turn is rigidly connected to the needle bed 10 of the knitting machine. In spite of the guide rollers 8, the vertical withdrawal of the knitted fabric on the guide section 5 ″ works without jamming, since again a wide-hold wire 6 ″ which is round in cross section is used.

Claims (10)

1. Spreader for a knitting machine having movable knockover bits and comprising a stiff holding section (1, 1') for holding the spreader on the knitting machine and an elongated, vertically disposed guiding section (5, 5') for removing the knitted product as well as an opposing holding device (7) for guiding the guiding section (5, 5', 5'') in a region below the middle of the guiding section (5, 5', 5''),
   characterized in that an elastic section (E) is disposed in the working region of the movable knockover bits between the stiff holding section (1, 1') and the elongated vertically disposed guiding section (5, 5') which, when loaded by a knockover bit in a horizontal direction can, in particular,
   sidewardly deflect with respect to the loading direction.
2. Spreader according to claim 1, characterized in that the elastic section is formed by a bundle of fibers (2, 2') having a high resistance to tearing which are firmly anchored at one side to the holding section (1, 1') and at another side to the guiding section (5, 5').
3. Spreader according to claim 2, characterized in that the fibers (2') are twisted together and form a unit.
4. Spreader according to claim 2 or 3, characterized in that the fibers (2, 2') are plastic fibers.
5. Spreader according to one of the preceeding claims characterized in that the guiding section (5, 5') is cylindrical having a ratio of height to diameter > 100, preferentially > 200.
6. Spreader according to one of the preceeding claims, characterized in that the holding section (1, 1') and/or the guiding section (5, 5') are made from a plastic which melts at high temperature.
7. Spreader according to claim 4 and 5, characterized in that the fibers (2, 2') are welded to the holding section (1) and/or the guiding section (5).
8. Spreader according to one of the claims 2 through 6, characterized in that the fibers (2, 2') can be clamped in the holding section (1) and/or in the guiding section (5).
9. Spreader according to one of the claims 2 through 6, characterized in that the fibers (2, 2') can be glued to the holding section (1) and/or to the guiding section (5).
10. Spreader according to one of the preceeding claims, characterized in that a vertical longitudinal slot (3, 3') is disposed in the elastic section (E) in the working region of the movable knockover bits into which a knockover bit can engage.

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