CN113846416A

CN113846416A - Warp knitting machine

Info

Publication number: CN113846416A
Application number: CN202010717855.1A
Authority: CN
Inventors: K·布兰德; C·施奈德
Original assignee: Carlmeyerstol R & D Co ltd
Current assignee: Carlmeyerstol R & D Co ltd
Priority date: 2020-06-26
Filing date: 2020-07-23
Publication date: 2021-12-28
Anticipated expiration: 2040-07-23
Also published as: EP3708702B1; TW202204711A; EP3708702A2; EP3708702A3; TWI815107B; CN113846416B

Abstract

The invention relates to a warp knitting machine, in particular a warp knitting machine (1) with a guide bar arrangement having a plurality of guide bars (4), the movement of which into an offset direction (8) is controlled by a jacquard control arrangement (9), wherein the jacquard control arrangement (9) has a control surface (10,11) for each guide bar (4) which loops around a rotational axis. It is desirable to ensure good quality of the warp knitting machine with simple handling. For this purpose, the control surfaces (10,11) of the at least two guide bars (4) are arranged on a common unchangeable structural element (14).

Description

Warp knitting machine

Technical Field

The invention relates to a warp knitting machine having a bar arrangement with a plurality of guide bars (Legebarren), the movement of which into an offset direction is controlled by a jacquard control arrangement (sometimes referred to as a pattern control arrangement), wherein the jacquard control arrangement has a control surface for each guide bar which loops around a rotational axis.

Background

Warp knitting machines are used to make knitted fabrics. In the production of knitted fabrics, the parallel-fed threads of the warp threads are connected to one another by means of a loop (Maschenbildung). The thread is guided here by means of a thread guide (Fadenufhrer), which is embodied, for example, as a thread guide needle (Legenadel). The yarn guides are respectively fixed at the yarn guide bars. The thread guide follows the movement of the thread guide bar. During the knitting process, the yarn guides must be guided around the needles or the working needles. This means that the thread guide bar must be moved parallel to its longitudinal extent in a movement section, perpendicular to the longitudinal extent in a second movement section, in a third movement section, in a return movement parallel to the longitudinal extent and in a fourth movement section again in a return movement perpendicular to the longitudinal extent during each looping operation. The motion does not necessarily have to be closed. The movement parallel to the longitudinal extension of the guide bar is also referred to as "offset movement (sometimes referred to as shogging movement)". The offset direction corresponds to the direction of the longitudinal extension of the guide bar.

In order to control the movement of the guide bars, so-called jacquard disks are usually used, on the outer circumference of which control surfaces are arranged. During operation the jacquard disk rotates. The thread guide bar rests with a push rod against a jacquard disk associated with the thread guide bar and is held, if necessary, by an elastic component against the jacquard disk.

When the warp knitting machine should be re-equipped for new knitted fabrics, for example in order to produce knitted fabrics with a changed jacquard, the operator must take such a jacquard disk out of the warehouse for each guide bar and install it at the warp knitting machine. This causes problems relatively frequently. The jacquard disk can be equipped with different laying motion initiations (Legungsanf ä ngen), for example in the direction of the needle back laying or the needle front laying or the laying motion displacement determined by the jacquard, in the manner of a codirectional and counter-directional yarn guide. Even if a "correct" jacquard disk is used, defective knitted fabrics or knitted fabrics with insufficient quality can be produced by defective mounting. Such defects are not usually easily discernible by the knitted fabric exiting from the warp knitting machine, but rather are recognized only at a later finishing or reprocessing of the knitted fabric.

Disclosure of Invention

The aim of the invention is to ensure good quality of the knitted fabric with simple handling.

This object is achieved in a warp knitting machine of the type mentioned at the outset in that the control surfaces of at least two guide bars are arranged on a common, unchangeable structural element.

In such a design, the two guide bars have a fixed relationship to one another anyway, which is not changeable during the installation of the control surface.

Preferably, the control surfaces of all guide bars are arranged at the construction element. The movements of all guide bars are thus fixedly adjusted to each other. The operator only has to install a single structural element. This reliably avoids defects in the arrangement of the control surfaces, which can occur by defective selection of the jacquard disk or by incorrect installation of the jacquard disk. The work preparation can also be simplified. It is no longer necessary to provide a large number of control disks for the knitted fabric to be produced or to mark control disks in the working device. Only the individual construction elements, i.e. the construction elements with control surfaces for all guide bars, have to be named and prepared. It is absolutely possible here to provide such elements with the name or the designation of the desired knitted fabric, so that the operator can easily recognize whether he has used the correct combination of control surfaces for the desired knitted fabric.

Preferably, the structural element is designed as a single piece. The control surfaces can therefore only be separated from one another by destroying the structural elements.

Preferably, the structural element has, for each control surface, a projection which is convex in the radial direction with respect to the axis of rotation, wherein adjacent projections are separated from one another by a recess having a base. The control surfaces thus have a defined distance from one another. The operator can then check relatively simply whether the structural element is mounted correctly. This is the case if the push rod of the guide bar is, if necessary, in contact with the control surface with the roller arranged in the middle. When the push rod or the roller of the push rod projects into the recess, this indicates that the structural element is not correctly installed. However, the structural elements can be mounted with a certain tolerance, as long as it is ensured that the push rods of the respective guide bars bear against the control surfaces. A small lateral displacement, i.e. a displacement transverse to the direction of displacement, is thus permissible.

Preferably, the structural element has a cylindrical base body from which the projection extends radially outward. The structural element is thus defined by a simple geometry. Only the projections deviate from the cylindrical shape of the base body.

Preferably, the cylindrical base body has a through-hole. The base body can then be pushed onto the shaft and, if necessary, secured against rotation relative to the shaft. This allows a very simple installation.

Preferably, the cylindrical base body has an outer diameter smaller than the diameter at the bottom of the recess. Between the projections, relatively much material is then provided, so that the projections and thus the control surfaces at the projections are fixed in terms of their angular position and are protected against damage.

Preferably, the projection merges with a rounding into the base of the cylindrical base body and/or into the bottom of the depression. The risk of stress cracks occurring here is thus kept small.

Preferably, the structural element is designed as a casting or forging, for which only the control surfaces and the through-openings are machined. This simplifies the manufacture of the structural element.

Drawings

The invention is described below with the aid of preferred embodiments in connection with the drawings. Wherein:

figure 1 shows a very schematic front view of a warp knitting machine,

FIG. 2 shows a side view of the warp knitting machine

Fig. 3 shows a structural element with a control surface.

Like elements are provided with like reference symbols in all the figures.

Detailed Description

A warp knitting machine 1, which is very schematically shown in fig. 1, has a bar assembly 2. The guide bar assembly has a knitting needle guide bar 3 and a plurality of guide bars 4. However, only one of the guide bars 4 is visible, since the guide bars 4 are arranged one behind the other perpendicular to the drawing plane in the view shown in fig. 1.

The needle bar 3 carries needles 5. The needle bar 3 moves up and down together with the needles 5 during the knitting process.

The thread guide bar 4 is suspended on a lever 6, so that the thread guide needles 7 or other thread guides can be pivoted through the gaps between the knitting needles 5. The thread guide bar 4 must perform a movement between said swinging movements into the offset direction 8 shown by the arrow. The offset direction 8 corresponds here to the longitudinal extent of the guide bar 4.

The movement of the guide bars 4 into the offset direction 8 is controlled by a jacquard control assembly 9. The jacquard control unit 9 has control surfaces 10,11 (fig. 2 and 3) for each guide bar 4, which control surfaces encircle the axis of rotation. The thread guide bar 4 is in this case attached to the control surface by a push rod 12. The push rod 12 may have rollers 13 at its ends adjacent to the control surfaces 10,11 in order to keep the friction forces low.

The control surfaces 10,11 are arranged according to the invention on the unchangeable structural element 14. Preferably, the structural element 14 is constructed as a casting or forging. The component 14 has a cylindrical base body 15 which is provided with a through-opening 16. The through-opening 16 has a recess 17 which extends parallel to the axis of the through-opening 16. The recess 17 serves to accommodate the spring element, so that the structural element 14 is held on the shaft in a rotationally fixed manner.

The control surface 10 is arranged at a projection 18 which projects in the radial direction relative to the axis of the base body 15 and the bore 16. The axis of the bore 16 simultaneously forms the axis of rotation for the structural element 14. The control surface 11 is arranged on a projection 19, which likewise projects from the base body 15 in the radial direction. Between the protrusions 18,19 a recess 20 is provided. The recess 20 has a bottom. The bottom portion has a larger diameter than the base body 15.

The

projections

18,19 transition into the base body 15 and into the bottom of the recess 20 by means of rounding-off

portions

21,22, respectively.

Only the control surfaces 10,11 and the holes 16 with the grooves 17 are machined. A drilling process is necessary to make the hole 16. The control surfaces 10,11 can be manufactured by milling or grinding.

The structural element 14 shown in fig. 3 has two

control surfaces

10, 11. How many control surfaces the construction element 14 has to have depends on the number of guide bars 4 used.

The structural element 14 is rotated by a motor 23, which can also drive a spindle, not shown in detail, which in turn is responsible for the lifting movement of the needle bar 3 and the swinging movement of the thread guide bar 4. The motor 23 can be connected to the structural element 14 by a belt or chain 24 and, if necessary, by a transmission 25.

When the warp knitting machine 1 has to be re-equipped in order to produce additional knitted fabric, only the structural elements 14 have to be replaced. It is thus ensured correctly not only that the start of the laying movement is synchronized with the knitting movement of the warp knitting machine 1 but also that the movements of the guide bars 4 in the offset direction with respect to one another, including the position of the guide bar 4 laterally in its threading (Fadeneinzug, sometimes referred to as threading).

The jacquard machine 9 can be designed simply in construction due to the connection of the structural elements 14. Thereby minimizing the tolerance chain formed by the patterning device and the control surface and reducing the costs in production. Furthermore, the use of the structural element 14 simplifies the retrofitting process of the warp knitting machine 1.

In addition, the source of defects in the jacquard change can be avoided in a simple manner.

Claims

1. Warp knitting machine (1) with a guide bar assembly having a plurality of guide bars (4), the movement of which into an offset direction (8) is controlled by a jacquard control assembly (9), wherein the jacquard control assembly (9) has a control surface (10,11) for each guide bar (4) which loops around a rotation axis, characterized in that the control surfaces (10,11) of at least two guide bars (4) are arranged at a common unchangeable structural element (14).

2. Warp knitting machine according to claim 1, characterized in that the control surfaces (10,11) of all guide bars are arranged at the structural element (14).

3. Warp knitting machine according to claim 1 or 2, characterized in that the structural element (14) is configured in one piece.

4. Warp knitting machine according to one of claims 1 to 3, characterized in that the structural element (14) has for each control surface (10,11) a projection which is convex in the radial direction with respect to the axis of rotation, wherein adjacent projections (18,19) are separated from one another by a recess (20) having a bottom.

5. Warp knitting machine according to claim 4, characterized in that the structural element (14) has a cylindrical base body (15) from which the projections (18,19) extend radially outwards.

6. Warp knitting machine according to claim 5, characterized in that the cylindrical base body (15) has through holes (16).

7. Warp knitting machine according to claim 5 or 6, characterized in that the cylindrical base body (15) has an outer diameter which is smaller than the diameter at the bottom of the recess (20).

8. Warp knitting machine according to one of claims 5 to 7, characterized in that the projections (18,19) transition with a rounding (21,22) into the cylindrical base body (15) and/or into the bottom of the recess (20).

9. Warp knitting machine according to one of claims 1 to 8, characterized in that the structural element (14) is configured as a casting or forging for which only the control surfaces (10,11) and the through-openings (16) are machined.