JP7178381B2 - Warp knitting machine and fabric withdrawal device for warp knitting machine - Google Patents

Description

The present invention is a warp knitting machine having a knitting area in which a knitting tool for producing a knitted fabric is arranged, and a fabric drawing device for drawing out the knitted fabric produced in the knitting process by the warp knitting machine from the knitting area. Regarding.

A warp knitting machine is a textile machine that produces a knitted fabric from knitting yarns by a stitch forming process. Formation of the stitches takes place in the knitting area of the warp knitting machine. In doing so, typical knitting tools are used, for example knitting needles and guide needles. A warp knitting machine has a plurality of bars, and a number of knitting tools are arranged on each bar. Multiple stitches are formed simultaneously in the knitting process because multiple knitting tools can be operated simultaneously by a single bar. Here lies the reason for the particularly high output of warp knitting machines.

Fabric withdrawal devices for warp knitting machines are known from the prior art. A warp knitting machine with a fabric withdrawal device is shown, for example, in DE 10 2010 046 587 B4. The fabric drawing device disclosed therein has a plurality of cylindrical drawing rollers. These are displaced by the rotary drive and thus pull the knitted fabric out of the knitting area. The knitted fabric is wound up on the winding roller.

German Patent Registration No. 102010046587

The present invention is based on the problem of providing a warp knitting machine for producing knitted fabrics with improved fabric quality.

The problem is that the fabric drawing device comprises a fabric guide element with a winding area, in which the knitted fabric wraps around said fabric guide element, the winding of the fixed machine bed of the warp knitting machine and the fabric guide element. A warp knitting machine is provided in which the distance between the regions is variable, so that the fabric pull-out stress that pulls the knitted fabric out of the knitting region can be made uniform by changing the distance. solve it by.

It has been found that this results in improved dough quality. During the knitting process, the knitting needles of the warp knitting machine work to form a knitted fabric. The formation of the stitches can then take place at variable positions within the knitting area, which influences the pull-out stress. The wrapping area of the fabric guide element is formed by part of the surface of the fabric guide element. The distance between the machine bed and the winding area is variable. As the wrapping area moves away from the machine bed, the fabric pull-out stress increases. As the wrapping area moves towards the machine bed, the fabric pull-out stress is reduced.

It has been found that the suppression of fabric pull-out stress according to the present invention results in uniform stitch sizes in the resulting knitted fabric. According to the invention, the position of the wrapping area is adapted to the position of the knitting area in which the stitch formation takes place. This is especially noticeable at high machine speeds.

Alternatively, it is conceivable to drive the support rollers such that they have variable rotational speeds and/or rotational directions. This also achieves suppression of the fabric pull-out stress. However, this would be very cumbersome to implement.

Advantageously, the fabric guide element is a rotatable support roller. The support rollers can feed the knitted fabric further by a rolling movement. The support roller preferably has a cylindrical shape. The support rollers can alternatively have different shapes.

It is advantageous if the support roller can be eccentrically driven. This is particularly advantageous if the fabric drawing device has a rotatably journalled support shaft for driving the support roller, the support shaft being arranged eccentrically with respect to the support roller. Implemented. According to the invention, the support roller can be displaced by a drive. Due to the eccentric arrangement of the support shaft with respect to the support rollers, the support rollers have a movement in which the distance of the winding area from the knitting area is constantly changing. This equalizes the fabric pull-out stress.

According to a possible variant of the invention, the support shaft is fixedly connected to the support roller. According to an alternative variant of the invention, the support shaft is fixedly connected to the runner disc, and the support shaft is arranged eccentrically to the runner disc. A support roller is rotatably supported on the runner disc.

Alternatively, the support rollers can also be movable in translation if an eccentric drive should not be provided. The surface of the support roller is therefore subjected to a sliding motion, whereby the fabric pull-out stress is evened out. Nevertheless, the support rollers can rotate simultaneously. The translational movement is provided by the fabric drawing device having a rotatably journalled support shaft for driving the support rollers, the support shaft being transversally movable with respect to the longitudinal axis of the support shaft. achieved. According to the invention, the support shaft can be provided with a device for pivoting the support shaft transversely to the longitudinal direction of the support shaft. If the support shaft moves transversely to its longitudinal axis and along an assumed transverse axis, the motion of the support rollers will have an added translational component. The transverse axis along which the support shaft moves preferably makes an angle of 90° with the longitudinal axis of the support shaft. The support roller can be rotatably journalled on the support shaft. Alternatively, it is possible that the support roller is fixedly connected with the support shaft and the warp knitting machine has a drive for rotating the support shaft.

According to a special embodiment of the invention, the fabric guide element is a movable guide rod. According to the invention, it can be a metal rod or a plastic rod. The guide rod can, according to the invention, be fixed to the pivotable lever. According to the invention, the knitted fabric is pulled from the knitting position by at least one withdrawal roller and guided past the guide rods. When the guide rod is moved by the pivoting of the lever, the guide rod is thus pressed against the fabric, deforming the fabric and increasing the fabric drawing stress. According to an advantageous embodiment of the invention, the carrier lever is attached to a drive lever of the warp knitting machine, which displaces the bar in reverse motion. The reverse motion is the swing motion of the bar required for stitch formation.

Advantageously, the fabric withdrawal device has at least one withdrawal roller arranged downstream of the fabric guide element. The at least one pull-out roller is rotated by a drive, thus exerting a pull-out force on the knitted fabric. According to an embodiment of the invention, a take-up roller can be provided after the at least one withdrawal roller, and the knitted fabric is taken up onto the take-up roller.

The fabric guide element is preferably connected to the drive element of the warp knitting machine. According to embodiments of the present invention, the drive element is capable of causing a rotational and/or translational movement of the fabric guide element. According to the invention, the drive element is the main shaft of the warp knitting machine. It can be connected to the fabric guide element. The main shaft is preferably also connected to at least one bar of the warp knitting machine and thus controls both the knitting process and the fabric drawing device.

The invention further relates to a knitted fabric withdrawal device for a warp knitting machine for withdrawing the knitted fabric produced by the knitting process from the warp knitting machine. According to the invention, the fabric drawing device comprises a fabric guide element with a wrapping area, in which the fabric wraps around the fabric guide element, the wrapping area is not positionally fixed, thereby knitting the knitted fabric. Fabric pull-out stresses pulling out of the area can be evened out. The fabric guide elements are preferably rotatable support rollers. Particularly preferably, the support roller is eccentrically drivable. According to the invention, the fabric drawing device then has a rotatably journalled support shaft for driving the support roller, the support shaft being arranged eccentrically with respect to the support roller. . According to a further embodiment of the invention, the support rollers can be translated.

The drawings show possible embodiments of the invention.
1 schematically shows a first embodiment of a warp knitting machine according to the invention with support rollers; FIG. 1 schematically shows a first embodiment of a warp knitting machine according to the invention with support rollers in different rotational positions; FIG. Fig. 4 schematically shows a second embodiment according to the invention having a support roller journalled on a translatable support shaft; FIG. 11 schematically shows a second embodiment with a translational movement of the support rollers; FIG. 5 schematically shows a third embodiment of a warp knitting machine according to the invention with a movable guide rod; 1 is a diagram schematically showing a knitting area of a warp knitting machine according to the present invention; FIG.

FIG. 1 schematically shows a first embodiment of a warp knitting machine 1 according to the invention with support rollers 2 . The warp knitting machine 1 has a knockover bar 3, where the knitted fabric 4 produced by the warp knitting machine 1 leaves the knitting area of the warp knitting machine. A support roller 2 receives a knitted fabric 4 . A support roller 1 is eccentrically connected to a support shaft 5 . The support shaft 5 is driven and rotated by the main shaft of the warp knitting machine 1 . A main shaft is arranged on the machine bed 6 of the warp knitting machine 1 . The knitted fabric 4 wraps around the winding roller 2 in the winding area 7 . The eccentric movement of the support rollers 5 results in an equalization of the fabric pull-out stress, so that the knitted fabric 4 is removed from the knockover bar 3 and from the knitting area of the warp knitting machine 1 (von der Abschlagbarre 3 und aus dem
Wirkbereich der Kettenwirkmaschine) is drawn out. The knitted fabric 4 then always partially rests against the surface 21 of the support roller 2 . A support shaft 5 is connected to the main shaft so that the fabric draw-out stress is always adapted to the knitting process. This results in a knitted fabric 4 of special quality. Three pull-out rollers 8 for further feeding out the knitted fabric 4 are provided behind the support rollers 2 . The support roller 2 together with the fabric withdrawal roller 8 form the fabric withdrawal device 9 of the warp knitting machine.

FIG. 2 schematically shows a first embodiment of a warp knitting machine 1 according to the invention with support rollers 2 in different positions. Rotation of the support shaft 5 changes the position of the support shaft 2 in order to keep the dough pull-out stress substantially constant.

FIG. 3 schematically shows a second embodiment of a warp knitting machine 1 according to the invention having a support roller 2 journalled on a translationally displaceable support shaft 5 . A carriage 11 is arranged on the support element 10 and is movable transversely to the longitudinal axis of the support shaft 5 . The support shaft 5 is rotatably supported within the carriage 11 . The drive unit moves the carriage 11 up and down. The support roller 2 therefore moves translationally along the axis of motion 12 represented by the double arrow. The translational movement of the support rollers 2 makes it possible to even out the fabric pull-out stress.

FIG. 4 schematically shows a second embodiment of the warp knitting machine 1 according to the invention with the support rollers 2 moved in translation. This makes it possible to keep the fabric pull-out stress approximately constant.

FIG. 5 schematically shows a third embodiment of a warp knitting machine 1 according to the invention with a movable guide rod 13 . A view from the end face of a guide rod 13 having a cylindrical shape is shown. The guide rod 13 is cylindrical and abuts against the knitted fabric 4 produced by the warp knitting machine 1 . The knitted fabric 4 winds on the guide rod 13 in the winding area and is then guided to a plurality of draw-off rollers 8 which draw the fabric 4 out of the knitting area. A lever 15 pivoted about a pivot axis 14 carries the guide rod 12 . In order to keep the fabric pull-out stress approximately constant, the lever 15 is swiveled by the drive and in doing so is pressed against the knitted fabric.

FIG. 6 schematically shows the knitting area 16 of the warp knitting machine. In the knitting area 16 the knitting needles 17 pass through the guide needles 18 in order to catch the knitting yarn 19 guided by the guide needles 18 . Knitting needles 17 and guide needles 18 are knitting tools. Each guide needle 18 is held by a guide bar 20 . As the knitting needle 17 swings past a plurality of guide needles 18, the knitting yarn is caught in a relatively large knitting area 16. The knitting needle 17 moves in a swing-through movement along the knitting needle path 21, represented by the double arrow. The guide bar 20 makes a counter-movement to the knitting needle 17 . The operation of the knitting tools and the size of the knitting area 16 in which the fabric occurs typically subject the fabric to varying fabric pull-out stresses. This is compensated by the fabric withdrawal device of the warp knitting machine according to the invention.

1 Warp knitting machine (Kettenwirkmaschine)
2 Support roller (Aufnahmewalze)
3 Knockover bar (Abschlagbarre)
4 Knitted fabric (Wirkware)
5 Support shaft (Aufnahmewelle)
6 machine bed (Maschinenbett)
7 Winding area (Auflaufbereich)
8 drawing roller (Abzugswalze)
9 Dough withdrawal device (Warenabzugseinrichtung)
10 Support element (Stuetzelement)
11 Carriage (Schlitten)
12 motion axis (Bewegungsachse)
13 Guide rod (Fuehrungsstange)
14 swivel axis (Schwenkachse)
15 Lever (Hebel)
16 Organization area (Wirkbereich)
17 knitting needles (Wirknadeln)
18 Guide Needle (Legenadel)
19 Knitting yarn (Kettfaden)
20 Guide bar (Legebarre)
21 Surface (Oberflaeche)

Claims (9)

A warp knitting machine having a knitting area in which a knitting tool for producing a knitted fabric is arranged,
a fabric pull-out device for pulling out the knitted fabric produced in the knitting process by the warp knitting machine from the knitting area;
The fabric drawing device comprises a fabric guide element having a winding area, wherein the knitted fabric wraps around the fabric guide element in the winding area,
The fabric guide elements are coupled with drive elements for controlling the knitting process of the warp knitting machine, such that the drive elements are capable of causing rotational and/or translational movements of the fabric guide elements, and The winding area of the guide element is arranged to move towards and away from the fixed machine bed of the warp knitting machine by said rotational and/or translational movement, thus said knitting The fabric pull-out stress that pulls the knitted fabric out of the knitting area caused by the operation of the knitting tools of the warp knitting machine in the process is equalized by changing the distance between the machine bed and the winding area. It is possible,
A warp knitting machine, wherein the drive element controls both the knitting process and the fabric drawing device. the fabric guide element is a rotatable support roller,
The warp knitting machine according to claim 1. The support roller is eccentrically drivable,
The warp knitting machine according to claim 2. The fabric drawing device has a rotatably journaled support shaft for driving the support roller,
The support shaft is arranged eccentrically with respect to the support roller,
The warp knitting machine according to claim 2 or 3. the support roller is translatably movable;
The warp knitting machine according to claim 2. The fabric drawing device has a rotatably journaled support shaft for driving the support roller,
the support shaft is transversally movable with respect to the longitudinal axis of the support shaft;
The warp knitting machine according to claim 5. said fabric guide element is a movable guide rod,
The warp knitting machine according to claim 1. The fabric drawing device has at least one drawing roller provided behind the fabric guide element,
A warp knitting machine according to any one of claims 1 to 7. A warp knitting machine having a knitting area in which a knitting tool for producing a knitted fabric is arranged,
a fabric pull-out device for pulling out the knitted fabric produced in the knitting process by the warp knitting machine from the knitting area;
The fabric drawing device comprises a fabric guide element having a winding area, wherein the knitted fabric wraps around the fabric guide element in the winding area,
Said fabric guide element is coupled with a drive element of said warp knitting machine in such a way that said drive element can cause a rotational movement and/or a translational movement of said fabric guide element, the winding area of said fabric guide element is configured to move towards and away from the fixed machine bed of the warp knitting machine by means of said rotational and/or translational movements, thus said warp knitting machine in said knitting process can be equalized by changing the distance between the machine bed and the winding area,
wherein the drive element is the main shaft of the warp knitting machine;
Warp knitting machine.

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