EP1239068A1 - Drive for a heald frame of a weaving machine - Google Patents

Abstract

A weaving loom has a drive for a heald shaft with a two-part link to a pushrod. The heald shaft drive is an electric motor with a rotor and stator. The electric motor (4) rotor (4a) has especially an oscillating continual reverse action operation. Each rotor (4a) forms part of an external rotor motor with a swivel arm (4d). The swivel arm has an articulated link point (4c) located outside the motor axial-geometric centreline (8). The link point (4c) is coupled to a pushrod (6) acting on the heald shaft (1). The modular motors are positioned as convenient on a fixed axle (5). The drive for each heald shaft is an electrically controlled linear motor (11) with a reverse-action rotor (11a). The rotor (11a) swivels on the fixed axle (5). The motor is a direct current or alternating current sector motor. If the assembly may have more than one fixed axle (5) to accommodate a number of motors.

Description

The invention relates to a drive for the heald frames of a loom according to the Features of the preamble of claims 1 and 2.

Drives for the heald frames of weaving machines based on so-called shaft or Dispensing with eccentric machines are known.

These drives can be categorized into the category of rotary direct current drives and in the category of so-called linear direct current drives.

The rotary DC drives are motors in their Direction of rotation, e.g. operated in an oscillating manner, reversible to the oscillating reversal movement via so-called reversing lever and linkage in one to transmit oscillating linear movement to the shedding means.

A further distinction can be made between so-called direct drives or drives which are connected to the shedding means by means of so-called shaft beams.
Such a drive with shaft support is known for example from DE 196 51 799 A1 and JP 07-324247 A.

Furthermore, from JP 11-124751 A is a drive for shedding means with shaft support known. The rotational movement of the drive is via gear means and one eccentrically mounted one-armed lever on the lever and pull or. Push rods existing shaft beam in a changing direction Lift movement converted for every heald frame.

From JP 11-350285 a drive for the shedding means is known, consisting of an electrically controllable external rotor motor having a rotor and stator.
The rotor of this motor has teeth on its outer circumference that mesh with the longitudinal struts of the heald frames, which are designed as toothed racks. The technical training resources have no beams here.
A similar drive is also known from DE 196 51 799 A1.

A significant disadvantage here is that the looms with special technical means, so Special stocks must be equipped, or at least in the case of DE 196 51 799 Heald frames must have appropriate precautions. This would be a departure from the conventional shafts. All previously available on the market Weaving machines would no longer be usable with this previously known drive variant.

From DE 198 21 094 A1 an electromagnetic mechanism for indirect or direct shaft drive is known.
In the indirect electromagnetic shaft drive, the lifting movement of the shafts takes place via the so-called shaft support, while in the case of a direct-acting electromagnetic drive, movement-deflecting means, such as deflection levers, are dispensed with.
The drive, which is apparently built on the basis of coils and coil core, does not give the person skilled in the art sufficient instructions on how the advantage mentioned in this document can be achieved.

From JP 09-078389 A a shaft drive without a shaft support is known. The drive consists of an electric motor, whose rotational movement by means of a Crank drive trained drive converted into an oscillating linear movement and is transferred to the heald frame. Such a drive solution also discloses JP 11-286850.

From the category DC linear motor as a drive device for shed materials from Weaving machines are also known from DE 198 49 728 A1.

This document discloses a drive device, for example for the shedding means of a weaving machine, which drive device consists of actuators which are designed as circular sector or quasi-rotation or direct current motors with a common magnetic stator flux of some or all actuators, which comes from a plurality of permanent magnets ,
Each of these permanent magnets is divided into at least two opposite polarized sectors and is arranged at a distance from adjacent permanent magnets in a non-magnetic carrier.

The permanent magnets are separated from one another and arranged by an air gap, in which a moving part is installed, which has a non-magnetic and electrically non-conductive support and at least one thin coil.
The transmission or conversion of the movement from the moving part to the working element is preferably made possible by a connecting link.
A position sensor, which is assigned to each actuator, serves as a position encoder.
The drive device between the motion transmission part of the linear DC motor and its relevant shedding means also requires a special shaft or at least suitable precautions which differ from the conventional heald frames.

Further linear DC motors as drives for the shedding means are known from JP 10-310947 A, JP 10-310948 A and from JP 10-310949 A.
Here, too, the drives require special shafts because the drives are arranged in the frame of the respective heald frame.
The disadvantage associated with these technical solutions is that the shaft package with the rotor of the linear DC motors must be lifted out of the weaving machine when the article or shaft is changed, which can lead to damage to the drives if the shaft package is reinserted.
Furthermore, these drives have the disadvantage that if the motor is defective, the shaft in question is jammed in its guides and the shaft can thereby be very easily damaged.
In addition, such a drive solution is only suitable for relatively narrow weaving machines because a central drive with the same drive concept as the drive integrated in the shaft side supports is not possible.
Another disadvantage of the drive solution disclosed in JP 10-310949 A is that either the heald frames have lengths of different lengths or that the healds with the same length must be laterally offset in the weaving machine. Such an arrangement of the shank does not allow for efficient work in the front section.
The known warp threading machines would have to be specially adapted for this. In addition, this drive solution leads to relatively wide weaving machines with a comparatively small weaving width.

European patent application EP 0 879 990 A1 discloses a rocker arm system acted upon by linear motors as the drive for the shedding means of a weaving machine.
The disadvantage here is that the position of the shaft connections differs from heald frame to heald frame. This means that it is no longer possible to exchange the individual shafts with one another, which is particularly disadvantageous in the storage of spare parts.

Finally, an arrangement of shedding means is known from European patent application EP 0 825 285 A1 which is driven by means of linear motors.
This arrangement has the disadvantage that both a superstructure and a substructure are required for the technical training means.
The drive takes place in so-called groups of four, so that the shafts must have differently positioned drive connections, i.e. differently positioned shaft connections.
It is also disadvantageous here that it is difficult to work in the preliminary work and when assigning the shanks during a shaft change.
Furthermore, the superstructure represents a certain confusion for every weaving company. The insertion of the healds into the weaving machine, as well as the removal, is generally not unproblematic, at least not in comparison with conventional heald frames.

Against the background of the cited prior art, it is an object of the invention to provide a To create drive for the technical training means of weaving machines and such in the Weaving machine to arrange that with conventional heald frames as a specialist and can be worked with the well-known quick-release fasteners and that on conventional shaft joists with bellcranks for shaft drive can be dispensed with.

The drive should not be designed as a crank drive. The drive should also be suitable for this various binding reports via a freely programmable control, different shaft strokes and different movement profiles of the heald frames realize.

According to the invention, the object is achieved by the features of claims 1 and 2 solved.

The drive according to the invention advantageously makes it possible to carry out any movement profiles with regard to the compartment opening profile and the compartment closure as well as any compartment strokes.
The subject closure can be assigned color and / or other parameters of the weft yarn and the binding.
With the drive according to the invention, costs are reduced both in terms of material and in terms of time by dispensing with shaft beams.
Service and maintenance measures, in particular the bearings integrated in the bellcranks, are no longer necessary.
All looms available on the market can be retrofitted without any significant effort, because the conventional heald frames with the conventional shaft couplings can be connected to the drives designed according to the invention.
Further advantageous effects result from the features of the dependent claims and from the following description of the exemplary embodiments.

The invention is explained in more detail below using exemplary embodiments.

Figur 1

eine schematische Darstellung von zwei elektromotorischen Antrieben in Verbindung mit einem Webschaft,

Figur 2

eine schematische Darstellung von drei elektromotorischen Antrieben in Verbindung mit einem Webschaft,

Figur 3

eine schematische Darstellung von zwei auf einen Schaftanschluss eines Webschaftes wirkenden elektromotorischen Antrieben mit unterschiedlicher Anordnung der Achsposition,

Figur 4

eine schematische Darstellung des oszillatorischen Antriebs als elektrischen Rotationsmotor,

Figur 5

eine schematische Darstellung des oszillatorischen Antriebs als elektrischen Linear-Motor,

Figur 6

eine schematische Darstellung des oszillatorischen Antriebs als Rotationsmotor nach Ansicht A-A in Figur 7 und

Figur 7

eine weitere schematische Darstellung der elektromotorischen Antriebe in modulartiger Anordnung auf den maschinenfesten Achsen.

In the accompanying drawings:

Figure 1

1 shows a schematic representation of two electromotive drives in connection with a heald frame,

Figure 2

a schematic representation of three electromotive drives in connection with a heald frame,

Figure 3

1 shows a schematic representation of two electromotive drives acting on a shaft connection of a heald frame with different arrangement of the axis position,

Figure 4

1 shows a schematic representation of the oscillatory drive as an electric rotary motor,

Figure 5

1 shows a schematic representation of the oscillatory drive as an electric linear motor,

Figure 6

is a schematic representation of the oscillatory drive as a rotary motor according to view AA in Figure 7 and

Figure 7

a further schematic representation of the electric motor drives in a modular arrangement on the machine-fixed axes.

A conventional heald frame 1 is shown in FIG.
As is generally known, the heald frame 1 is equipped with first coupling means 2.

These coupling means 2 are a second in modern weaving machines Coupling means 3 push-pull rods 6 so-called quick-release couplings, like this e.g. are known from DE 195 48 848 B1.

In the figure, the coupling means 2 are arranged in a known manner on the shaft side supports 1a.
In the case of relatively wide weaving machines, ie weaving machines with a weaving width of, for example, more than three meters, further shaft connections 2 can be present, as shown in FIG. 2.
Only a central, central shaft connection 2 can be present, as is known from JP 09-078389 A, when it comes to looms with a small weaving width, for example with a width of less than 1.5 m.
Contrary to the known technical solutions, the push-pull rods 6 in FIG. 1 are not articulated to so-called movement deflection levers of so-called shaft beams, but rather are fastened at a suitable point on the rotor 4a of an electrically controllable motor 4 which is reversible in its direction of rotation.
The reversal of the direction of rotation of the rotor 4a is indicated by the double arrow 9, while the push-pull movement of the push-pull rod 6 is indicated by the double arrow 10. The motor 4 designed according to the invention and its arrangement according to the invention relative to the specialist image means will be dealt with elsewhere.

FIG. 2 shows shedding means consisting of at least two heald frames 1.
Furthermore, a multiple arrangement of the axles 5 carrying the motors 4 is shown.
A multiple arrangement of the axes 5 is also shown in FIG. 3.
The multiple arrangement of the axes 5 disclosed in FIG. 3 is important when a predetermined pitch T between the individual heald frames, see also FIG. 2, is usually a 12 mm pitch that is less than the axial dimension of the motor 4.

With two axes 5, for example, the axial dimension of each motor 4 acting on a shaft connection 2 is then 24 mm, and with three axes 5, as shown in FIG. 7, the axial dimension can be 36 mm.
The axes 5 are, as will become clear later, machine-fixed axes which support the stator 4b of the motor 4.

The axes 5 are preferably designed as multi-spline axes which receive the motors 4 in a modular manner.
Furthermore, the axles are designed as hollow axles, specifically with an axial passage 5 a, which passes coolant for cooling the motors 4.

In Figure 4, the structure of the aforementioned motor 4 is shown.
The operation of the motor 4 corresponds to that of a conventional direct current or alternating current motor, with the difference that the rotor 4a is an external rotor which, according to its control, realizes an oscillating, reversible rotary movement according to the double arrow 9, and this rotary movement via a suitable one means 4d present on the outer circumference into a pivoting movement. At the free end of the means 4d, a pivot point 4c is formed, on which the push-pull rod 6 acts according to FIGS. 1 to 3 and 7. The stator 4b of the motor 4 carries, as is known per se, the symbolically illustrated windings 4e.
Corresponding to the circumference of the axis 5 designed as a multi-spline profile, the stator 4b has a correspondingly designed receptacle 4f.
The motor 4 is, as will become clear hereinafter, a shaftless DC or AC motor.

As an alternative to the aforementioned rotary drive, the drive shown in FIG. 5 is designed as a circular sector linear motor 11.
The basic structure and the mode of operation of such a circular sector linear motor is known, for example, from DE 198 49 728 A1, so that there is no need to go into this in detail.
The rotor 11a of the linear motor 11 is designed in the manner of a pivotably mounted one-armed lever, at the free end of which a pivot point 11c is provided for connecting to a push-pull rod 6 according to FIG. 1.
In the operating state, the stator 11b of the linear motor 11 is connected in a rotationally fixed manner to an axis 5, in accordance with the previous statements relating to the rotary drive 4.
In the operating state of the motor 11, the inner ring 12a of a roller bearing 12 which meets the rotor 11a on the outer ring 12b is also connected in a rotationally fixed manner to an axis 5.
The inner ring 12a of the roller bearing 12 is provided with wedge-shaped recesses which are designed in accordance with the wedges of the multi-spline axis 5.

FIG. 6 shows a top view of the motors 4 or 11 arranged on the axes 5 according to FIG. 7 in the first arrangement plane.
The stators 4b or 11b of the motors 4 or 11 are arranged here in a modular manner on each axis 5 and connected to it in a rotationally fixed manner.
Taking into account the shaft division T already mentioned, three motors 4, 11 are effective on one side of a heald frame 1. The same number of motors 4, 11 is effective on the other side of the heald frame.

FIG. 7 makes it clear that at least two in a first arrangement level Motors 4 and in a second arrangement level at least one further motor 4 on and the same side of a heald frame 1 via the corresponding pull-push rod 6 can be effective.

DRAWING LEGEND

1

Fachbildmittel (heald frame)

1a

Shaft side support

2

coupling agent

3

coupling agent

4

rotary engine

4a

rotor

4b

stator

4c

articulation

4d

pivoting part

4e

winding

4f

admission

5

axis

5a

passage

6

Push-pull rod

7

control

8th

mid-axis

9

double arrow

10

double arrow

11

linear motor

11a

runner

11b

stator

12

roller bearing

12a

inner ring

12b

outer ring

T

division

Claims (17)

Drive for the heald frames of a weaving machine equipped with a main drive, which heald frames have first coupling means which can be operatively connected to second coupling means of a push-pull rod, and wherein the drive of each heald frame is at least one electrically controllable electric motor consisting of a rotor and stator, which is connected to a suitable one Is connected to the weaving machine, characterized in that the rotors (4a) of the electric motors (4) are reversible in their direction of rotation,
that each rotor (4a) is a rotor of an external rotor electric motor which has a swivel part (4d), which swivel part outside the axial-geometric center axis (8) of the electric motor is a pivot point (4c) for the push-pull rod which can be operatively connected to the heald frame (1) (6) owns and
that a non-rotatable axis (5) is provided as a suitable location, on which the electric motors (4) are positioned in a modular manner. Drive for the heald frames of a weaving machine equipped with a main drive, which heald frames have first coupling means which can be connected to second coupling means of a push-pull rod, and wherein the drive of each heald frame is at least one electrically controllable, linear motor consisting of a rotor and a stand is connected to the weaving machine at a suitable point, characterized in that the rotors (11a) of the linear motors (11) can be reversed in their running direction,
that the runners (11a) are designed as a pivoting part (11d) which is pivotably mounted about an axis (5) connected to the weaving machine in a rotationally fixed manner, which pivoting part has a pivot point (11c) outside its bearing for the push-pull rods (6) which can be operatively connected to the heald frame owns and
that a non-rotatable axis (5) is provided as a suitable location, on which the linear motors (11) are positioned in a modular manner. Drive according to claim 1, characterized in that the motor (4) is optionally a direct current or alternating current rotary drive. Drive according to claim 2, characterized in that the motor (11) is either a circular sector linear direct current motor or a circular sector linear alternating current motor. Drive according to claim 1 or 2, characterized in that a multiple arrangement of the axes (5) is provided if a predetermined division (T) of the shedding means (1) is smaller than the axial size of the motor (4; 11). Drive according to claim 1 or 2, characterized in that in the case of a multiple arrangement of the axes (5), at least one first axis and one second axis are arranged axially parallel to one another in a common arrangement plane. Drive according to claim 6, characterized in that in the case of a multiple arrangement of the axes, at least a first and a second axis (5) are arranged axially parallel in a common arrangement plane and at least one further axis (5) is arranged in an arrangement plane different from the common arrangement plane. Drive according to claim 1, characterized in that the axis (5) is preferably a multi-spline axis. Drive according to claim 1 or 2, characterized in that each axis (5) is assigned a motor (4; 11) for one shed forming means (1). Drive according to claim 1 or 2, characterized in that the motors (4; 11) of the shedding means (1) can be operated synchronously with the main drive. Drive according to claim 1 or 2, characterized in that the shedding means (1) are conventional heald frames. Drive according to claim 1 or 2, characterized in that the shed forming means (1) have at least one quick coupling known per se. Drive according to claim 1 or 2, characterized in that the at least one rotationally fixed axis (5) is arranged vertically spaced below the shed forming means (1). Drive according to claim 1 or 2, characterized in that the motors (4; 11) can be controlled in a freely programmable manner via a controller (7). Drive according to claim 14, characterized in that programs for the binding, programs for the shaft strokes, programs for the compartment opening profiles and programs for the compartment closure are stored in the control (7) depending on parameters of the weft yarn. Drive according to claim 1 or 2, characterized in that the axis (5) has a central passage (5a) over its length. Drive according to claim 16, characterized in that the passage (5a) is a coolant line.

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