TW201728797A - Warp-knitting machine - Google Patents

Abstract

A warp-knitting machine (1) having at least two main shafts (2a, 2b), each of which actuating at least one bar assembly, is stated. The intention is to state a warp-knitting machine having high productivity. To this end it is provided that each main shaft (2a, 2b) is in drive connection with a dedicated drive motor (6a, 6b).

Description

Warp knitting machine Field of invention

The present invention is directed to a warp knitting machine having at least two major axes that each actuate at least one of the rod assemblies.

Background of the invention

During operation of the warp knitting machine, the spindles are each rotated, for example by means of a crank drive that drives at least one rod (however, usually a plurality of rods), wherein the warp knitting tool is fastened to the rod. The crank drive can have a plurality of portions that span the length of the rod.

In the case of a warp knitting machine having more than one spindle, the spindles must be driven with a certain degree of interdependence. This is currently achieved by means of a transmission device that establishes a connection between the main shafts. In many cases, the transmission device has a belt that transfers rotational motion from one spindle to the other.

During the operation of the warp knitting machine, the duty cycle occurs with the spindle rotating. These load cycles cause high wear. This wear increases as the speed of operation increases, whereby wear constitutes a certain limit to the increase in the speed of operation of this type of warp knitting machine.

Summary of invention

The present invention is based on the object of stowing a warp knitting machine with high productivity.

In the case of the previously mentioned type of warp knitting machines, the aim is achieved in that each spindle is in transmission connection with a dedicated drive motor.

Each spindle is thus driven by a dedicated drive motor, whereby the transmission between two or more spindles can be eliminated. Therefore, there is no negative impact on the transmission device by means of the load cycle. The smooth operation of the warp knitting machine is made possible by the use of a corresponding dedicated drive motor for each spindle, in which case the increase in the output of the warp knitting machine is allowed. This also applies if and at least one of the spindles actuates the designated rod assembly by means of a crank drive, the latter being a potential embodiment. Not only is the production speed (i.e., the rotational speed of the spindle) increased, but a longer spindle can also be used, resulting in a larger working width.

At least one of the drive motors is preferably arranged to be coaxial with the other of the spindles designated for it. In this case, lateral stresses between the main shaft and the designated drive motor can be avoided, which will occur when driven by means of, for example, a belt or a chain. Therefore, the stress on the shaft of the drive motor and the bearing of the corresponding spindle remains low. The service life is extended. Space requirements can be reduced. There is no need for a device space that is laterally adjacent to the respective drive motor of the spindle, whereby other auxiliary devices of the warp knitting machine can be accommodated here as appropriate. According to the dynamics of the machine, by positioning on the spindle line and phase The connection of the drive motor is advantageous.

It is preferred in this context that each drive motor acts directly on the spindle designated for it. Direct connection means that the drive motor is connected to the spindle without any gearing. The rotational speed of the drive motor is therefore transmitted to the spindle at a ratio of 1:1. Therefore, there is no movable part that can be worn between the drive motor and the main shaft.

Preferably, each of the drive motors has a rotor, at least one of which is mated to a spindle designated for the drive motor. The instantaneous, direct and rigid connection between the drive motor and the spindle designated for it is thus carried out in a simple manner.

In this context, the spindle is preferably protruded through the rotor by means of a shaft. The rotor can thus have through holes such that the respective main shaft projects from either side of the motor, producing a motor having two shaft ends. In this case, a bearingless motor can potentially be used, since the mounting can be carried out by means of a spindle or by means of a shaft of the latter, respectively.

Alternatively or additionally, it may be as long as at least one of the drive motors is arranged to be eccentric with the other spindle designated for it. In this case, the drive motor can be connected to the main shaft by means of a gear stage. This actually requires a device space that is laterally adjacent to the main shaft, however a certain degree of freedom can be imparted when the drive motor is selected.

The drive motor is preferably connected to a common controller device. The controller arrangement ensures that the drive motor drives the respective spindles such that the rotational movements of the spindles match each other. For example, if and when the warp knitting machine is constructed as a warp knitting machine with a double-sided knitting needle, such as for making wool When woven or warp-knitted spacer fabrics, a sufficiently precise designation of the movement of the individual rods is required, which are responsible for making the base warp knit fabric and for guiding the spacers or pile yarns. This can be easily accomplished by means of a common controller device. Furthermore, the controller device has the advantage that the former can electronically optimize the acceleration and force distribution of the spindle during one revolution of the spindle so that this has a positive effect on the overall dynamics of the machine. Higher machine rotational speeds may be dependent on the adjusted dynamics. In addition, warp-protected loop formation is possible. Especially in the case of machines with double-sided knitting needles, the dynamics can be optimized depending on various command states, and the oscillations that occur can be minimized or even avoided altogether for this reason.

The controller device herein preferably has an electronic transmission. The electronic transmission enables the spindle to be driven at a variable rotational speed, wherein variations in rotation, and more particularly variations in rotational speed, can also occur during one revolution of the spindle. This has a positive impact on the above dynamics of the machine.

The electronic transmission preferably has a variable gear transmission within one revolution. The gear ratio between the rotational movements of the main shaft can thus vary during operation, preferably even during one revolution. For example, various stress states of the respective spindles can be considered. For example, if and when the rod assembly can be lifted in one of the main shaft revolutions, the speed of rotation will generally be reduced to a lesser extent, while in the case of a lowering motion in another portion of the rotation, the latter may be smaller. Increased in degree. The stresses on the spindle do not need to occur simultaneously on all spindles in the same way, so that these stress states can be compensated by means of an electronic transmission.

At least one of the drive motors is preferably disposed within an axial length of the spindle to which it is designated. Therefore, one part of the main shaft is located on one side of the transmission motor, and the other part of the main shaft is located on the other side of the transmission motor. This has the advantage that both parts of the main shaft can be actuated in a similar, preferably even symmetrical manner.

1‧‧‧ warp knitting machine

2, 2a, 2b‧‧‧ spindle

3‧‧‧Operating part

4‧‧‧End shaft

Section 5‧‧‧

6, 6a, 6b‧‧‧ drive motor

7‧‧‧ Stator

8‧‧‧Rotor

9‧‧‧ bearing

10, 10a, 10b‧‧‧Flange

11‧‧‧End side

12‧‧‧ Shell

13‧‧‧Free end

14‧‧‧Second bearing

15‧‧‧Spiral catheter

16‧‧‧Rotary encoder

17‧‧‧Running space

18‧‧‧Needle parts

22‧‧‧Controller device

23‧‧‧Electronic transmission

The invention will be described below with the aid of a preferred exemplary embodiment together with the accompanying drawings in which: Figure 1 shows a schematic perspective view of one end of a machine frame of a warp knitting machine having two spindles; Figure 2 shows two without a casing One spindle; Figure 3 shows a segmented horizontal section of a machine tool that passes through a warp knitting machine; and Figure 4 shows a longitudinal section through the drive motor.

Figure 3 shows one end of one half of the warp knitting machine 1 in the above cross-sectional view.

Detailed description of the preferred embodiment

The warp knitting machine 1 has a spindle 2 having a first portion configured as an operating portion 3 and a second portion configured as an end shaft 4. A crank drive that acts as a drive rod is fastened to the running portion 3 in a manner not shown in more detail, wherein the rods support the warp knitting tool in a known manner.

The operating portion 3 is interconnected with the end shaft 4 in a rigid but releasable manner. As can be seen from Figure 4, for this purpose, the end shaft 4 has a portion 5, which is The minute 5 has a reduced diameter and can be introduced into the operating portion 3 of the main shaft 2 and can then be connected to the operating portion 3.

The main shaft 2 is connected to a drive motor 6 which is arranged coaxially with the main shaft 2. The drive motor 6 is directly connected to the main shaft 2 without the insertion of a transmission or gear stage, wherein this connection is preferably a rigid connection.

As an alternative to a rigid connection, an elastic connection, for example a rotationally rigid and flexible connection, such as a bellows connection, can also be used.

Figure 4 shows a particularly preferred design embodiment in a cross-sectional view. In this context, the end shaft 4 is introduced through the drive motor 6. The transmission motor 6 has a stator 7 and a rotor 8. The rotor 8 is fitted to the end shaft 4, that is to say to the end shaft 4 and to the end shaft 4 in a rotationally fixed manner. The rotation of the rotor 8 is thus transmitted to the end shaft 4 and thus to the main shaft 2 in a straightforward and rigid manner without any further intermediate elements.

The motor 6 is constructed to be bearingless. The mounting of the rotor 8 in the stator 7 is carried out by mounting the end shaft 4 in a bearing 9 provided outside the transmission motor 6. This bearing 9 is located in the flange 10, which in turn is fastened to the end side 11 of the outer casing 12, wherein the outer casing 12 is adapted to receive the main shaft 2. In other words, the main shaft 2 is disposed in the outer casing 12 and the transmission motor 6 is fastened to the end side 11 of the outer casing 12. The end shaft 4 thus projects through the end side 11 . The outer casing 12 can also be referred to as a machine tool.

As can be seen in Figure 4, the main shaft 2, more specifically the end shaft 4, enters the drive motor 6 at the axial end and protrudes from the drive motor 6 by means of the free end 13. The free end 13 can be mounted in another bearing 14. The requirement to supply the second bearing 14 depends on the requirements during the operation of the warp knitting machine 1.

The stator 7 of the drive motor 6 has a helical conduit 15 through which a coolant (e.g., oil) can be directed. For the sake of clarity, the connector for the coolant is not shown. The connectors can be positioned below the drive motor 6, for example, behind the drawing plane shown in FIG.

A rotary encoder 16 is provided at the free end 13 of the end shaft 4. The rotary encoder 16 is constructed as an absolute rotary encoder, ie the former can determine the angular position of the spindle 2 in an absolute manner. To this end, magnetic or visual coding detectable by the rotary encoder 16 can be provided, for example, on the free end 13. Rotary encoder 16 is preferably a non-contact rotary encoder.

The end side 11 may also be referred to as an end wall that separates the operating space 17 of the outer casing 12 from the needle component 18. An oil sump for lubricating the bearing of the main shaft 2 can be provided, for example, in the operating space 17. Such an oil sump is not required in the needle member 18.

The drive motor 6 is configured as a rotary control motor, in particular an electric induction motor. In this context, a synchronous motor driven by means of a controller device comprising an inverter so as to be able to set the required number of revolutions is particularly preferred.

With the described construction, only a small number of components are required in order to connect the drive motor 6 to the main shaft 2. The drive motor 6 is directly and rigidly connected to the main shaft 2 because the rotor 8 of the drive motor 6 is directly fitted to the end shaft 4 of the main shaft 2. The drive motor 6 is flanged to the end wall 11 of the outer casing 12 and is therefore mounted in an extremely stable manner. The risk of the resulting oscillation is minimized for this reason.

Since the transmission motor 6 is constructed to be bearingless, the former can be kept small and light. By positioning on the shaft of the spindle 2, the integration of the drive motor 6 is preferred in terms of machine dynamics.

The machine frame (i.e., the outer casing 12) in the region of the needle member 18 becomes relatively light, which also has a role in terms of machine dynamics. Only relatively few parts are required. The drive motor 6 is virtually maintenance free.

If and when the length of the main shaft 2 is extremely large, it may be advantageous for the transmission motor to be disposed in the axial length of the main shaft. By way of example, the drive shaft can be subdivided into two parts of equal length, and in this case a drive motor can be arranged between the two parts in order to carry out a so-called central drive.

1 and 2 now show a design embodiment in which the construction of the drive motor 6 and the drive shaft 2 as described herein is used in a warp knitting machine 1 having more than one spindle 2.

Figures 1 and 2 show a warp knitting machine having two spindles with suffixes "a" and "b" for ease of distinction. The same applies to the reference marks, which describe other elements already mentioned in Figures 3 and 4.

As mentioned, the warp knitting machine has two spindles 2a, 2b which are driven by drive motors 6a, 6b. Two drive motors 6a, 6b are housed in the needle member 18. Furthermore, the flanges 10a, 10b (Fig. 2) can be identified by means of which the spindles 2a, 2b are mounted in the end side 11 of the outer casing 12.

The two main shafts 2a, 2b are no longer interconnected by means of belts, chains, gears or other transmission units, but each main shaft 2a, 2b is connected to its dedicated drive motor 6a, 6b. As described in the context of Figures 3 and 4, each of the drive motors 6a, 6b is arranged to be coaxial with the spindles 2a, 2b assigned thereto, and the drive motors 6a, 6b act directly on the spindles 2a, 2b assigned thereto on.

The connection between the main shafts shown in Fig. 4, more specifically their end shafts 4, and the respective drive motors 6a, 6b is applied to the two end shafts in a similar manner.

The illustration shows the controller device 22 connected to the two drive motors 6a, 6b. The controller device 22, which may have the inverter mentioned above, supplies the two transmission motors 6a, 6b with multiphase alternating current so that the two transmission motors 6a, 6b can operate as induction motors.

The controller device 22 also has an electronic transmission 23 such that the rotating magnetic fields delivered to the transmission motors 6a, 6b can have different frequencies. These frequencies can be easily changed during one rotation of the respective main shafts 2a, 2b. This change does not have to be the same for both drive motors 6a, 6b, but can be reversed.

It may therefore be considered, for example, that the stresses of the spindles 2a, 2b do not necessarily progress in a uniform and coordinated manner during the looping process. For example, if and when the main shaft 2a in one of the loop forming procedures has to lift the warp knitting tool, another condition of the stress caused by the warp knitting tool driven by the lowered main shaft 2b can be applied in exactly the same time period. Spindle 2b. Such a situation can occur in the case of warp knitting machines having double-sided knitting needles, for example, for making warp-knit spacer fabrics or for making plush goods. The current rotational speed of the main shaft 2a can be temporarily lowered while the warp knitting tool is being lifted, and the current rotational speed can be temporarily and temporarily increased as the warp knitting tool descends. In this case, the special effects in the warp knitting machine can be compensated in advance, and smooth operation can also be achieved in the case of relatively high machine speeds and relatively long spindles 2a, 2b. Now.

2a, 2b‧‧‧ spindle

6a, 6b‧‧‧ drive motor

10a, 10b‧‧‧Flange

18‧‧‧Needle parts

22‧‧‧Controller device

23‧‧‧Electronic transmission

Claims (10)

A warp knitting machine having at least two spindles each actuating at least one rod assembly, characterized in that each spindle is in driving connection with a dedicated drive motor. A warp knitting machine as claimed in claim 1, characterized in that the at least one drive motor is arranged to be coaxial with the spindle designated for it. A warp knitting machine as claimed in claim 2, characterized in that each of the drive motors acts directly on the spindle designated for it. A warp knitting machine as claimed in claim 2 or 3, characterized in that each of the transmission motors has a rotor, at least one of which is fitted to a spindle designated for the transmission motor. A warp knitting machine as claimed in claim 4, characterized in that the main shaft projects through the rotor via a shaft portion. A warp knitting machine according to any one of claims 1 to 5, characterized in that the at least one drive motor is arranged to be eccentric with the spindle designated for it. A warp knitting machine according to any one of claims 1 to 6, characterized in that the transmission motor is connected to a common controller device. A warp knitting machine as claimed in claim 7, characterized in that the controller device has an electronic transmission. A warp knitting machine as claimed in claim 8, characterized in that the electronic transmission has a gear transmission that is variable within one revolution. A warp knitting machine according to any one of claims 1 to 9, characterized in that the at least one transmission motor is arranged in the axial length of the spindle designated for it.