TWI519690B - Yarn guide unit for a textile machine - Google Patents

Description

Textile machine guide unit

The present invention relates to a yarn guiding unit for a textile machine.

In practice, yarn guide units have long been used in textile machines to continuously move the yarn back and forth as the yarn is wound or re-wound. A yarn guiding unit with a belt drive is often used for this oscillating movement. Here, the belt drive has a drive belt to which the yarn guide can be directly attached. In the simplest design scenario, the drive belt is guided around a first and second pulley. Typically, one of the two pulleys is formed as a drive pulley. The oscillating movement of the yarn guide is produced by a series of corresponding rapid changes along the drive pulley or one of the directions (several) assigned to one of the drive motors of the drive pulley. This type of belt drive is characterized by a long service life and low maintenance cost, not just because of its simple construction. This is necessary for the movement of the yarn in a textile machine such as, for example, a winder or a winder.

For example, a yarn guiding unit for a textile machine as mentioned above is known from EP 1 209 114 A1.

In view of the high frequency oscillation movement required by the yarn guide, the moving mass in the yarn guiding unit must be as small as possible. This limitation means that the drive belt used is as narrow as possible and as light as possible.

In practice, in general, the narrow drive belt is combined with a flange disc on both sides. The pulleys are used together. The purpose of the flange disc is to prevent undesired deflection of the drive belt on the pulley. When the drive belt is installed, the drive belt is typically positioned around the two pulleys, after which the drive belt is tensioned by an idler or (as the case may be) an idler roller. One of the two flanged discs can be detachably attached to the pulley to make it easier to install the drive belt.

The manufacture of these types of pulleys is much more expensive than a pulley having only one flanged disc, wherein in the former case an additional so-called belt guide plate must be used to prevent the drive belt from sliding from the pulley. These belt guide panels must be individually adjusted, which in practice unreasonably increases the cost of installing and maintaining the yarn guide unit.

Accordingly, the present invention is based on the task of designating a yarn guiding unit that allows for the use of a narrow drive belt and that is more cost effective to manufacture at the same time and requires minimal expense for assembly and maintenance.

The task with respect to the yarn guiding unit is solved by a yarn guiding unit having one of the features stated in the patent claim 1.

In the yarn guiding unit according to the present invention, a very narrow driving belt can be used in combination with a plurality of pulleys, each of which has only one flange disc. For example, this type of pulley is cost effective to manufacture by injection molding. Commercially available yarn guide units typically have a belt drive in which the axes of rotation of the two pulleys are aligned parallel to one another and are configured to position the drive belt perpendicular thereto (ie, at least two revolutions thereof) The belt runs in a flat plane. In contrast, the two pulleys of the yarn guiding unit according to the invention are arranged such that their axes of rotation are inclined in opposite directions with respect to a line perpendicular to the plane of the belt mentioned above. Thus, the axes of rotation of the two pulleys intersect at an imaginary point that is disposed at a distance from the plane of the belt and perpendicular to the sides of the flanges of the two pulleys. In general, in this manner, the running drive belt can be guided such that one of its sides abuts against the flange of the pulley, i.e., in a direction toward and against one of the flanges of the two pulleys. Therefore, this effectively hinders the drive belt from sliding from the pulley. This makes The (separate) belt guides are redundant for guiding the drive belts, which are time consuming and therefore extremely expensive to adjust. Overall, this is beneficial for the installation and maintenance costs of the yarn guiding unit. Due to the pulley having only one flange, the yarn guiding unit according to the invention can also be made to have an overall reduced mass of movement. In doing so, the inertia of the yarn guiding unit can be reduced by 15% to 20%, which makes it possible to have better controllability of the yarn guiding unit even at high frequencies and extremely high frequency oscillations. In the present application, the term pulley is understood to also include (idle) rolls or (idle) wheels designed to be used with a drive belt.

According to the invention, the first pulley and the second pulley train are arranged such that their axes of rotation are inclined to different angles with respect to the vertical line of the plane of the belt. In practice, the drive pulley of the yarn guiding unit often has a diameter that is larger than the diameter of the other of the two pulleys. In this case, it has proven to be advantageous if the pulley driven by the drive motor is arranged to be inclined by its axis of rotation relative to the vertical line to a lesser extent than the other of the two pulleys. By adjusting the (tilt) angle formed by the respective diameters of the rotating shaft and the pulley with respect to the vertical line of the belt plane, the sliding (release) of the driving belt from the first pulley constructed as the driving pulley can be particularly reliably hindered.

According to the present invention, the rotational axis of the pulley (i.e., the drive pulley) driven by the drive motor encloses a first angle α1 with respect to the vertical line, of which 0.25° 11 0.5°. According to a preferred embodiment of the invention, the first angle α1 is about 0.38°. According to the invention, the rotation axis of the other pulley surrounds a second angle (α2) with respect to the vertical line, of which 0.6° 22 0.85°, specifically about 0.75°. Therefore, the drive belt can be sufficiently reliably guided on the pulley while having minimal wear such as a belt from friction against the flange disk.

Particularly preferably, one of the two pulleys is formed as a tight pulley for tensioning the drive belt. This can be used on the one hand to facilitate the mounting of the drive belt on the two pulleys. On the other hand, one of the best ways to drive the belt drive is to drive The belt is pretensioned.

According to a further preferred form of the invention, the pulley formed as an idler wheel is provided with a flexibly deformable pretensioning element by means of which the idler can be changed to or (depending on the situation) ) Maintained in the tension setting that tensions the drive belt. On the one hand, this provides an easy way to set or (as the case may be) to limit the tensioning of the drive belt to a specified value. By doing so, it is possible to reliably prevent excessive stress from being placed on the drive belt. On the other hand, this facilitates the mounting of the drive belt to the pulley.

The pulley formed as an idler can be configured such that it can be moved in particular by a slider on one of the bearing elements of the yarn guiding unit. In this embodiment, the pretensioning elements mentioned above are preferably engaged with the slider. To facilitate the installation of the drive belt, the slider can be pushed towards the other of the two pulleys, thereby making it easier to feed the belt on both pulleys.

According to a further preferred embodiment of the invention, the slider has a locking member by which the slider can be fastened to the bearing member. Therefore, the idle pulley can fix the tension setting of the drive belt tension to the proper position of the bearing member (and relative to the other pulley).

According to the invention, the drive belt can be a flat belt or a toothed belt.

The drive belt preferably has a uniform width from 3 mm to about 10 mm (preferably about 3.5 mm) along its entire length.

Further advantages and advantageous embodiments of the subject matter of the present invention emerge from the description, the scope of the claims and the drawings. Furthermore, the features that have been described and the features still to be stated can be used independently or in any desired combination.

The present invention relates to a yarn guiding unit for a textile machine comprising: - a yarn guide for guiding a yarn; and - a belt drive

Having a drive belt, the yarn guide is fixed to the drive belt, Having a first pulley and a second pulley, the drive belt is guided around the first and second pulleys and has a controllable and/or adjustable drive motor for driving one of the two pulleys By

The two pulleys each have only one flanged disc to laterally guide the drive belt so that the yarn guiding unit can be made to have an overall reduced inertia. According to the invention, the two pulleys are arranged such that their axes of rotation are inclined in opposite directions with respect to a line perpendicular to the plane of one of the belts of the drive belt, in such a way that the drive belt is guided to one side when the yarn guiding unit is in operation The edges abut against the flanges of the two pulleys. Thus, the two axes of rotation of the pulley are placed at an angle of less than 90° with respect to the plane of the belt.

The invention is explained in more detail below with the aid of one embodiment illustrated in the drawings.

The embodiments illustrated and described are not to be considered as an exhaustive description, but rather to the illustrative features of the invention.

The drawings in the drawings are to be regarded as a

10‧‧‧Textile machine

12‧‧‧Guide unit

14‧‧‧Belt drive

16‧‧‧Drive belt

16a‧‧‧ side edge

18‧‧‧First pulley/pulley

18a‧‧‧Rotary axis

20‧‧‧Second pulley/pulley

20a‧‧‧Rotary axis

22‧‧‧ yarn guide

24‧‧‧Yarn

26‧‧‧ bearing components

28a‧‧‧Rotation direction

28b‧‧‧Rotation direction

30‧‧‧Sliding parts

32‧‧‧Moving axis

34‧‧‧Pretensioning elements

36‧‧‧Defined pretensioning/pretensioning force

38‧‧‧Locking members

40‧‧‧ drive shaft

42‧‧‧Controllable and / or adjustable drive motor / drive motor

44‧‧‧Flange plate

46‧‧‧Running or guiding surface

48‧‧‧Vertical line/line

50‧‧‧ notch

11‧‧‧ first angle

22‧‧‧Second angle/angle

E‧‧‧Belt plane

B‧‧‧even width

Schema show:

Figure 1 has a textile machine having a yarn guiding unit, the yarn guiding unit having a belt drive having a driving belt around one of the two pulleys, wherein the pulleys each have a flanged disk and have opposite directions a tilting rotary shaft; and Fig. 2 a side view of the yarn guiding unit according to Fig. 1.

Figure 1 shows a textile machine 10 having a yarn guiding unit 12. The textile machine 10 is presented in a schematic form for purposes of illustration only and may be represented, for example, as a yarn winding machine or as a winder. The yarn guiding unit 12 has a belt drive 14 having a drive belt 16 that wraps around a first pulley 18 and a second pulley 20 . The drive belt 16 in the present case is made as an endless belt. After two revolutions, the drive belt 16 extends across a belt plane (indicated by E in Figure 1 and shown in dashed lines). A yarn guide 22 for guiding a yarn 24 is fixed to the drive belt 16. Two pulleys 18, 20 are positioned such that the yarn guide means with respect to the other one of the bearing member 12 about the respective rotational axis 26 thereof, etc. 18a, 20a to each other alternately rotating direction 28a, 28b pivot. The bearing element 26 in the present case is formed, for example, as a bearing plate. The first pulley 18 is driven by a motor and functions as a drive pulley for driving the belt 16. The second pulley 20 is formed as an idler and is mounted on a slider 30 . The slide member 30 along one of two pulleys connected to the rotary shaft moving shaft 32 displaceably positioned on the bearing member 26. A flexibly deformable pretensioning element 34 engages with a slider 30 which in the present case is formed as a compression spring. The compression spring is supported on the bearing element 26. The pretensioning element 34 exerts a defined pretensioning force 36 on the slider that acts in a direction away from the first pulley 18 by the moving shaft 32. Due to the pre-tensioning force 36, the second pulley 20 can be changed to one of the tension settings in which the drive belt 16 is placed under tension. As seen from Figure 1, the slider has a locking member 38 to displaceably lock (fasten) the slider 30 to the bearing element 26. Thus, the second pulley 20 formed as an idler can be fastened to the bearing element 26 in its tension setting.

Figure 2 shows a side view of the yarn guiding unit 12 according to Figure 1. The yarn guide is not shown (Figure 1). The first pulley 18 is fastened to the drive shaft 40 of the drive motor 42 and the operation (rotational direction/rotational speed/acceleration) of the drive motor can be controlled and/or adjusted by a control unit (not shown in detail). Drive motor 42 is formed as an electric motor and is disposed substantially below bearing element 26. Each of the two pulleys 18, 20 has only one flange disc 44 to laterally guide the drive belt 16. The inside of the flange disk 44 forms the running or guiding surface 46 of the drive belt 16 to prevent the drive belt 16 from sliding laterally from the pulleys 18, 20 (when it is in operation). Figure 2 show, the first pulley 18 is arranged so that its rotation shaft 18a with respect to the vertical plane E of the belt 48 at a first inclination angle α _1, the drive belt 16 is positioned along the belt plane E.

The second pulley 20 is disposed such that its rotation shaft 20a is inclined in a direction opposite to the rotation axis 18a of the first pulley 18 and encloses an angle α ₂ with respect to the vertical line. In the present case, the first angle is about 0.38° and the second angle is about 0.75°. Thus, both of the rotating shafts 18a, 20a are disposed in a common vertical plane (not shown) aligned orthogonally to the plane of the belt and one of the (imaginary) points is not shown in detail (which is located at the convexity of the pulleys 18, 20) The side of the edge disk 44 intersects at a distance from the plane E of the belt.

The drive belt 16 that moves back (operating) during operation of the yarn guiding unit is guided by the inclined configuration of the two rotating shafts 18a, 20a, wherein the side edge 16a of the drive belt 16 associated with the two flanged discs 44 of the pulleys 18, 20 Guided against the flange disk 44 and fastened in this manner to avoid undesired sliding from the pulleys 18, 20.

As shown in Fig. 2, the two pulleys 18, 20 have recesses 50 into which the drive belt 16 formed as a toothed belt can be engaged in the present case. Alternatively, the drive belt 16 can also be formed as a flat belt.

16‧‧‧Drive belt

16a‧‧‧ side edge

18‧‧‧First pulley/pulley

18a‧‧‧Rotary axis

20‧‧‧Second pulley/pulley

20a‧‧‧Rotary axis

26‧‧‧ bearing components

30‧‧‧Sliding parts

34‧‧‧Pretensioning elements

38‧‧‧Locking members

40‧‧‧ drive shaft

42‧‧‧Controllable and / or adjustable drive motor / drive motor

44‧‧‧Flange plate

46‧‧‧Running or guiding surface

48‧‧‧Vertical line/line

50‧‧‧ notch

11‧‧‧ first angle

22‧‧‧second angle

E‧‧‧Belt plane

B‧‧‧even width

Claims (10)

A yarn guiding unit (12) for a textile machine (10) comprising: a yarn guide (22) for guiding a yarn (24); and a belt drive (14) having a drive a belt (16), the yarn guide (22) is fixed on the driving belt (16), has a first pulley (18) and a second pulley (20), the driving belt (16) surrounds the same The first and second pulleys (18, 20) are guided and have a controllable and/or adjustable drive motor (42) for driving one of the two pulleys (18, 20); The two pulleys (18, 20) each have only one flange disc (44) for laterally guiding the drive belt and wherein the two pulleys (18, 20) are arranged such that their equal axes of rotation (18a, 20a) are relative to A line (48) perpendicular to one of the belt planes (E) of the drive belt (16) is inclined in the opposite direction in such a manner that the drive belt (16) is guided when the yarn guiding unit (12) is operated Its side edges (16a) abut against the flange discs (44) of the two pulleys (18, 20). The yarn guiding unit of claim 1, wherein the two pulleys (18, 20) are configured such that their axes of rotation (18a, 20a) are inclined to different degrees with respect to the vertical line (48). The yarn guiding unit of claim 2, wherein the pulley (18, 20) driven by the driving motor (42) is inclined relative to the vertical line (48) by its rotating shaft (18a, 20a) to be larger than the two pulleys The other of (18, 20) is a small one. A yarn guiding unit according to any one of claims 1 to 3, wherein the rotating shaft (18a, 20a) of the pulley (18, 20) driven by the driving motor (42) is surrounded by the vertical line (48) In a first angle (α1), of which 0.25° 11 0.5°, and the rotating shaft (18a, 20a) of the other pulley (18, 20) encloses a second angle (α2), of which 0.6° 22 0.85°. A yarn guiding unit according to any one of claims 1 to 3, wherein one of the two pulleys (18, 20) is formed as an idler to tension the drive belt (16). The yarn guide unit of claim 5, wherein the pulley (18, 20) formed as an idler wheel is provided with a flexibly deformable pretensioning member (34) by means of the pretensioning member (34) The pulley (18, 20) is changed to its tension setting that tensions the drive belt (16). The yarn guiding unit of claim 6, wherein the idler train is disposed on a slider (30), the slider (30) being movably mounted on the bearing member (26) of the yarn guiding unit (12) . A yarn guiding unit according to claim 7, wherein the slider (30) has a locking member (38) to fasten the slider (30) to the bearing member (26). The yarn guiding unit of any one of claims 1 to 3, wherein the driving belt (16) is a flat belt or a toothed belt. A yarn guiding unit according to any one of claims 1 to 3, wherein the driving belt (16) preferably has a uniform width (b) from one of 3 mm to 10 mm.