System for tensioning drive belt of draft mechanism, having draft mechanism and belt tension-adjusting plyer

Abstract

To provide a draft mechanism, a belt tension-adjusting plyer, and a system consisting of a draft mechanism and a belt tension-adjusting plyer capable of simplified adjustment of the tension of the drive belt.SOLUTION: The invention relates to a draft mechanism having at least two pairs of rollers, which each have a top roller and a bottom roller 2a and 2b, and at least one drive motor 16a for driving at least one of the bottom rollers, wherein: the at least one drive motor and the bottom roller, which can be driven by the at least one drive motor, are arranged on a bottom roller carrier 1; and the at least one drive motor, which is connected to the bottom roller via a drive belt, is arranged on the bottom roller carrier such that its distance from the bottom roller can be varied in order to set a drive belt tension. The drive motor is supported by the bottom roller carrier, which can be rotated around rotary shafts 7a and 7b and fixed in an adjusted position.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a draft mechanism for a spinning machine, comprising at least two roller pairs each having an upper roller and a lower roller, and at least one drive motor for driving at least one of the lower rollers, wherein the at least one drive motor and the lower roller drivable by the at least one drive motor are arranged on a lower roller support, and the at least one drive motor coupled to the lower roller via a drive belt is arranged on the lower roller support so as to be variable in distance with respect to the lower roller for adjusting the drive belt tension.Furthermore, the present invention relates to a belt tension adjusting pliers for adjusting the drive belt tension of the draft mechanism, and to a system for tensioning a drive belt of a draft mechanism, comprising a draft mechanism and a belt tension adjusting pliers.

[0002] Drafting mechanisms for spinning machines are known from the prior art in various embodiments. They serve to draw or stretch the sliver, which results in a cross-sectional reduction of the fibers. In order to achieve a uniform sliver, which is a prerequisite for producing a uniform yarn, the fibers must be transported as uniformly as possible next to each other during drawing.

[0003] To draw the sliver, the drafting mechanism usually has a number of roller pairs arranged side by side, positioned next to each other and sandwiching the drawn sliver between them, the roller pairs usually consisting of a driven lower roller and an upper pressure roller abutting the lower roller. The drawing of the sliver is achieved by the circumferential speed increasing from roller pair to roller pair in the sliver conveying direction defined by the direction of rotation of the roller pairs.

[0004] To drive the lower rollers, which are rotatably supported on the lower roller support of the drafting mechanism, it is known to use a drive motor associated with each lower roller, which drives the lower roller via a drive belt. To ensure a reliable force transmission from the drive motor to the lower rollers, it is necessary that the drive belt connecting the drive motor and the lower rollers has a set drive belt tension.

[0005] To adjust the drive belt tension, in known drafting mechanisms, a drive motor is mounted on a motor plate so as to be longitudinally slidable, the longitudinal sliding then causing a change in the distance between the drive motor and the lower roller, through which the drive belt tension can be adjusted, for which purpose the drive motor slides on the motor plate to a position set for the required drive belt tension and is fixed there by suitable mounting means.

[0006] Misalignment can occur when the drive motor is fixed, making it necessary to check the drive belt tension after each tensioning step, which usually requires costly frequency measurements, which are very cost- and time-intensive, especially in the case of drafting mechanisms where the individual lower rollers are coupled to the drive motor over different belt lengths.

[0007] SUMMARY OF THE PRESENTLY PRESENTED EMBODIMENTS Based on the above, an object of the present invention is to provide a draft mechanism, belt tension adjusting pliers, and a system comprising the draft mechanism and the belt tension adjusting pliers that allows for easy adjustment of drive belt tension.

[0008] The present invention solves the problem by a drafting mechanism having the features of claim 1, by belt tensioning pliers for adjusting the drive belt tension of the drafting mechanism having the features of claim 8, and by a system for tensioning a drive belt of a drafting mechanism comprising a drafting mechanism and a belt tensioning pliers having the features of claim 12. Preferred developments of the invention are set out in the dependent claims.

[0009] The drafting mechanism according to the invention is characterized in that at least one drive motor of at least one lower roller rotatably mounted on the lower roller support is supported on the lower roller support so that it can be pivoted about a pivot axis and can be fixed in an adjusted position for adjusting the distance from the associated lower roller. Accordingly, the invention provides that the drive motor is fixedly connected to the lower roller support via a pivot axis even during the adjustment of its position. The pivot axis then extends on the lower roller support in such a way that the pivoting of the drive motor about the pivot axis results in a change in the distance of the drive motor from the lower roller or a change in the distance of the drive shaft axis of the drive motor from the pivot axis of the lower roller. In this way, the fixed arrangement of the drive motor via the pivot axis makes it possible to conveniently pivot the drive motor, which can be pivoted relative to the lower roller support, to a position in which the required distance between the drive motor and the lower roller is obtained for the required drive belt tension. The constant connection of the lower roller support with the drive motor via the pivot shaft reliably prevents tilting of the drive motor, which would result in the drive belt tension in the adjusted position differing from the drive belt tension intended for this purpose. For adjusting the drive belt tension, for example, a marking can be provided on the lower roller support, which is assigned to the corresponding drive belt tension under a corresponding positioning of the drive motor. In this way, the draft mechanism according to the invention allows a particularly simple and reliable adjustment of the drive belt tension and thus ensures a reliable operation of the draft mechanism. Furthermore, it is possible to compensate for, for example, circumferential tolerances between different production lots of the drive belt.

[0010] In principle, there is the option of arranging not only the pivot axis on which the drive motor is supported on the lower roller support, but also the lower roller and the drive motor such that their drive shaft axis and rotation axis have different alignments. However, in a preferred embodiment of the invention, it is provided that the at least one drive motor is pivotally supported on the lower roller support such that the pivot axis, the drive shaft axis of the at least one drive motor and the rotation axis of the associated lower roller are arranged parallel to one another. This embodiment of the invention ensures not only easy adjustability of the drive belt tension, but also a reliable force transmission from the drive motor to the lower roller. In addition to this, the corresponding embodiment ensures that, depending on the pivoting movement, the drive belt tension increases or decreases in proportion to the pivoting of the drive motor about the pivoting axis.

[0011] The range of position adjustment of the drive motor on the lower roller support, i.e. the swivelability of the drive motor around the pivot axis, can in principle be configured in any manner. However, in a preferred embodiment of the invention, it is intended that at least one drive motor is arranged on the lower roller support in such a way that it can be adjusted between a final position, which defines a maximum distance from the lower roller, and an initial position, which defines a minimum distance from the lower roller. A corresponding embodiment of the invention ensures that when the drive motor is arranged in the region of the initial position, the drive belt can be comfortably positioned on the drive motor and the associated lower roller. In addition, the final position ensures that the drive belt tension does not exceed the maximum tension. In addition, the limited position adjustment range of the drive motor reliably avoids misalignments that could lead to damage to the drive motor and to adjacent assemblies of the drafting mechanism.

[0012] The alignment of the drive motor, in particular of its pivot axis, to the lower roller on the lower roller support can in principle be performed in any manner, as long as it is guaranteed that a change in the spacing between the drive motor and the lower roller occurs when the drive motor pivots about its pivot axis. In a preferred embodiment of the invention, it is intended that the drive motor is pivotably arranged on the lower roller support in such a way that when it is in an intermediate position with corresponding spacing from the initial and final positions, the plane extending through the pivot axis and the associated drive shaft axis extends perpendicularly to the plane extending through the associated drive shaft axis and the rotation axis of the associated lower roller.

[0013] This embodiment of the invention ensures that the adjustment movement of the drive motor in the direction from the intermediate position towards the final or initial position correspondingly increases or decreases the drive belt tension. The adjustment paths in both adjustment directions are consistent and proportional to the increase or decrease of the drive belt tension. In addition to this, the corresponding embodiment ensures a very compact design of the drafting mechanism as well as good accessibility to the drive motor, so that the drive belt tension can be adjusted in a comfortable manner.

[0014] The position adjustment of the drive motor for adjusting the drive belt tension can in principle be carried out in any manner. In a preferred embodiment of the invention, it is provided that the drive motor has a spigot which runs parallel to an associated retaining bolt at the lower roller support, the retaining bolt and the associated spigot being spaced apart from one another in such a way that a change in their distance results in a position adjustment of the drive motor between an initial position and a final position.

[0015] In this preferred embodiment of the invention, at least one drive motor, or preferably each drive motor if there is more than one drive motor, is associated with a retaining bolt that is fixedly arranged on the lower roller support. Furthermore, at least one drive motor, or preferably each drive motor if there is more than one drive motor, has a plug bolt that runs parallel to the respective retaining bolt. In this way, the positioning of the drive motor can be performed by changing the spacing of the plug bolt relative to the retaining bolt. This embodiment of the invention thus makes it possible to use a gauge that has openings for the plug bolt and the retaining bolt, for example. The spacing of the respective openings is then assigned to a defined drive belt tension, so that the gauge can be used both for adjusting and checking the drive belt tension. To adjust the drive belt tension, all that is required is to position the plug bolt relative to the retaining bolt in such a way that it coincides with the opening arranged in the gauge.

[0016] In addition to this, the retaining bolt and the spigot also make it possible to use a tool adapted to them for adjusting the distance between the retaining bolt and the spigot and thus for a reliable adjustment of the drive belt tension. In a preferred embodiment, the spigot runs through a recess in the lower roller support, which recess is configured, for example, as an oblong hole, so that not only is a reliable guidance of the spigot guaranteed in a convenient manner, but also the final and initial positions can be precisely defined.

[0017] In a preferred embodiment, the lower roller support has an upper surface and a lower surface, the lower roller is supported on the upper surface of the lower roller support, and a support member protruding perpendicularly thereto from the lower surface is provided, on which at least one drive motor is supported. A drive belt then runs across the lower and upper surfaces of the lower roller support from the drive motor to the associated lower roller. The lower roller support and the support member may be molded in one piece or in multiple parts in a preferred embodiment. In the case of a multiple-part configuration, the lower roller support and the support member are further preferably connected or coupled to each other by conventional coupling and / or connecting members.

[0018] In a preferred embodiment, the lower roller support has a through-hole through which the drive belt extends. The through-hole may preferably be formed in the lower roller support as an opening that is partially or completely surrounded by an edge. In the case of an embodiment that is partially surrounded on the edge side, the opening edge that surrounds and thus delimits the opening preferably simultaneously forms the edge side of the lower roller support. This allows easy access of the through-hole from the edge side of the lower roller support. In an equivalent preferred manner, a recess, into which the plug bolt is preferably inserted, may be formed in the lower roller support or in its support member.

[0019] The fixing of the at least one drive motor in the adjusted position can in principle be performed in any manner. According to a preferred embodiment of the invention, it is provided for this purpose that the lower roller support has at least one recess extending through the lower roller support for receiving at least one locking screw for fixing the at least one drive motor in the adjusted position. In this embodiment, it is provided for at least one screw to be screwed to the drive motor so as to pass through the recess of the lower roller support, so that the drive motor can be clamped to the lower roller support in the adjusted position via the screw. The recess is then dimensioned in such a way that the fixing of the drive motor can be performed in any intended positioning of the drive motor between the initial position and the final position.

[0020] In addition to this, the use of the spigot and the retaining bolt as envisaged according to a preferred development of the invention makes it possible to use the belt tension adjusting pliers according to the invention for adjusting the drive belt tension of a drafting mechanism, which has two pliers halves pivotally connected to one another via a joint bolt, one end of which is configured as a hand grip and the other end of which each has a functional element which together form a functional element pair, which are arranged in the same plane of movement and are movable towards one another by operating the pliers halves. It is characteristic of the belt tension adjusting pliers according to the invention that the prestressing elements prestress the functional elements which extend perpendicular to the plane of movement and are configured as spigot bushes for receiving the retaining bolt and the spigot, towards one another with a defined prestress.

[0021] An embodiment of the belt tensioning pliers according to the invention having bayonet bushings for receiving retaining bolts and bayonet bolts by means of which the drive motor of the drafting mechanism can be positioned relative to the associated lower roller for drive belt tensioning allows for comfortable adjustment of the drive belt tensioning with the belt tensioning pliers.

[0022] According to the invention, the prestressing element, which prestresses the plug bushes toward each other, determines the distance between the retaining bolt and the plug bolt and thus the positioning of the drive motor on the lower roller support. The prestressing element is appropriately selected so that, after the belt tensioning pliers with the plug bushes are placed on the associated retaining bolt and the plug bolt, the drive belt tension is automatically adjusted in a reliable manner as a function of the prestress applied by the prestressing element and acting on the drive belt. After the belt tensioning pliers are placed, the drive motor can be fixed in the position set by the belt tensioning pliers without any further manual position adjustment of the pliers halves, so that an exact positioning of the drive motor is achieved under the set drive belt tension.

[0023] In this case, the stresses exerted by the belt tensioning pliers on the retaining bolt and the bayonet bolt and thus on the drive belt, and the associated positioning of the drive motor at the lower roller support, are determined as a function of the prestressing element and the distance from the coupling bolt of the belt tensioning pliers to the bayonet bush. In this way, the preferably intended interchangeability of the prestressing element allows for an adaptation of the drive belt tensions produced by the belt tensioning pliers. Furthermore, in a preferred embodiment of the invention, it is provided that the respective functional elements of the functional element pair are arranged at equal distances from the coupling bolt. This embodiment of the invention provides in a special way protection against incorrect operation of the belt tensioning pliers, since according to this embodiment of the invention it does not matter which of the bayonet bushes the retaining bolt and the bayonet bolt are arranged.

[0024] Furthermore, in another embodiment of the invention, it is provided that the functional element pairs are arranged at the other end of the pliers half at at least two different distances from the joint bolt. Due to the different distances from the joint bolt to the plug bushes of the at least two functional element pairs, different prestresses can be transferred to the retaining bolt and the associated plug bolts depending on the number of functional element pairs by one belt tensioning pliers without changing the prestressing element. Thus, the corresponding embodiment of the belt tensioning pliers can also be used alone to adjust the drive belt tension in a drafting mechanism in which several drive motors are operated with different drive belt tensions.

[0025] The embodiment of the prestressing element can in principle be freely selected, insofar as it generates a prestressing element with which the plug bushes are prestressed to move closer to each other. Such a prestressing element can be generated, for example, by a compression spring arranged in the area of ​​the handgrip. In a preferred embodiment of the invention, however, it is provided that the prestressing element is configured as a tension spring arranged in the pliers half in the area between the functional element pair and the joint bolt. The use of a tension spring ensures a defined prestressing of the plug bushes of the functional element pair in a particularly simple and reliable manner. In addition to this, the tension spring can be replaced in a particularly simple manner if necessary, so that the belt tensioning pliers can be utilized to apply different clamping forces.

[0026] The present invention further solves the problem by a system for tensioning a drive belt of a drafting mechanism, the system comprising: - a drafting mechanism according to the invention or according to a development thereof as described above, - belt tensioning pliers according to the invention or according to a development thereof as described above; having The bayonet bushings arranged on the belt tensioning pliers are adapted to the bayonet bolt and the retaining bolt.

[0027] The system according to the invention, consisting of a drafting mechanism and belt tensioning pliers, allows in a particularly simple and comfortable manner to adjust the drive belt tension of the drive belt connecting the lower roller with the drive motor. It is particularly preferably provided here that the prestressing element is configured as a belt tensioning pliers, so that the belt tensioning pliers, which are arranged on the retaining bolt and the spigot, prestress the drive belt with the set belt tension. A corresponding system consisting of a drafting mechanism and belt tensioning pliers thus allows the machine operator in a particularly simple and comfortable manner to impart to the drive belt the drive belt tension required for operation. In this way, the setup of the drafting mechanism, as well as the maintenance and servicing, can be carried out in a particularly simple manner, since the belt tensioning pliers ensure reliable belt tension. Furthermore, the belt tensioning pliers also make subsequent checking of the belt tension with additional tools unnecessary.

[0028] In a preferred embodiment of the invention, the drafting mechanism then has at least two roller pairs, each with one drive motor coupled to the lower roller, and the belt tensioning pliers have two pairs of functioning members for adjusting different belt tensions. In this embodiment of the invention, the belt tensioning pliers can apply different prestresses to the plug bolt and the retaining bolt via both pairs of functioning members, each with a plug bush arranged at a different distance from the joint bolt. This makes it possible to adjust the drafting mechanism with the drive belt with different required drive belt tensions by means of the belt tensioning pliers. In this embodiment of the invention, it is possible to omit the use of a separate belt tensioning pliers for adjusting the second drive belt tension.

[0029] Next, an embodiment of the present invention will be described with reference to the drawings. [Brief description of the drawings]

[0030] [Figure 1]FIG. 1 shows a perspective view in a schematic diagram of a first embodiment of a drafting mechanism. [Diagram 2] FIG. 2 shows a perspective view in a schematic diagram of the lower part of a second embodiment of the draft mechanism; [Diagram 3] 3 shows another perspective view in a schematic diagram of the lower portion of the draft mechanism of FIG. 2. FIG. [Figure 4] FIG. 3 shows a perspective view in a schematic diagram of a portion of the lower part of the draft mechanism of FIG. 2. [Diagram 5] 3 shows a perspective view in a schematic diagram of a first drive motor of the lower part of the draft mechanism of FIG. 2; FIG. [Figure 6] 3 shows a perspective view in a schematic diagram of a second drive motor of the lower part of the draft mechanism of FIG. 2; FIG. [Figure 7] FIG. 1 shows a perspective view of a schematic diagram of belt tensioning pliers according to one embodiment. [Figure 8] 8 shows a perspective view in schematic diagram form of the lower portion of the drafting mechanism of FIG. 2 in a first interaction with the belt tensioning pliers of FIG. 7; FIG. [Figure 9] 8 shows a perspective view in schematic diagram form of the lower portion of the drafting mechanism of FIG. 2 in a second interaction with the belt tensioning pliers of FIG. 7; FIG.

[0031] 1 shows a schematic perspective view of a draft mechanism 17 which can be attached to a spinning station of a textile machine (not shown) and which can be fixed to the textile machine via a locking hook 21. Here, the draft mechanism 17 has a draft mechanism upper part 19 pivotally connected to a draft mechanism lower part 18a, and is pivoted by operating a hand grip 20.

[0032] When in the operating position shown in Figure 1, the draft mechanism upper part 19, with its four upper rollers arranged one behind the other so as to pass through the draft mechanism 17 in the extension direction of the sliver (not shown here), abuts against the corresponding driven lower rollers 2a, 2b of the draft mechanism lower part 18a.

[0033] A second embodiment of the drafting mechanism lower part 18b is shown in a perspective view in Figures 2 and 3. The drafting mechanism lower part 18b has two upper rollers 2a, 2b, which are rotatably supported on the upper surface of the lower roller support 1 via the lower roller bearings 5 ​​of the lower roller support 1. To drive the lower rollers 2a, 2b, the drafting mechanism lower part 18b has two drive motors 16a, 16b, which are respectively associated with the lower rollers 2a, 2b. Here, the drive motors 16a, 16b are pivotally supported on the support member 1b via respective coupling bolts 11a, 11b, which extend through bearing bushes 12a, 12b in the support member 1b of the lower roller support 1. The support member 1b is configured in the form of a plate and extends perpendicularly to the lower surface 1c of the lower roller support 1. The lower roller support 1 is configured integrally with the support member 1b in this preferred embodiment, in other words is configured from a part that is one piece with the support member 1b. In a preferred embodiment (not shown), the lower roller support 1 and the support member 1b may be multi-part and may be connected or joined to each other via conventional connecting or coupling members. To transmit the drive movement of the drive motors 16a, 16b to the lower rollers 2a, 2b, drive belts 3a, 3b are used which are wound around the drive motors 16a, 16b and the belt pulleys 4 of the lower rollers 2a, 2b, respectively. These drive belts run through respective penetrations in the lower roller support 1, crossing the lower surface 1c and the upper surface 1b of the lower roller support 1, respectively.

[0034] In order to adjust the drive belt tension of the drive belts 3a, 3b, the drive motors 16a, 16b can rotate around pivot axes 7a, 7b set via joint bolts 11a, 11b, thereby making it possible to adjust the distance between the belt pulleys 4 of the lower rollers 2a, 2b and the associated belt pulleys 4 of the drive motors 16a, 16b.

[0035] In order to adjust the position of the drive motors 16a, 16b relative to the lower rollers 2a, 2b in the lower roller support 1, the drive motors 16a, 16b are each provided with a retaining bolt 13, which is fixedly arranged on the support 1b, and a corresponding plug bolt 14. The plug bolt 14 here projects through the slot 9b or the recess 33 in the embodiment shown in Figs. 2 and 3, and through the slots 9a, 9b of the support 1b in the embodiment shown in Fig. 4, so that the retaining bolt 13 and the plug bolt 14 are arranged in one plane and aligned parallel to one another. The recess 33 here differs from the slot 9b or the slots 9a, 9b in that it reaches the edge side of the support 1b and thus constitutes the edge side of the support 1b or the lower roller support 1, allowing access via the edge side. The adjustment movement of the drive motors 16a, 16b is then limited by the length of the slots 9a, 9b or the recesses 33. The distance from the retaining bolt 13 to the plug bolt 14 then defines the position of the drive motors 16a, 16b on the support element 1b of the lower roller carrier 1, and the adjusted position of the drive motors 16a, 16b is fixed in each case by means of a locking screw 15 which protrudes through the further slots 10a, 10b, 22a, 22b and is screwed into the opening 23 of the respective drive motor 16a, 16b, so that the drive motors 16a, 16b can be clamped to the support element 1b in the adjusted position (see Figures 5 and 6).

[0036] When the plug 14 is in the intermediate position shown in Figures 2 to 4, in which it is equally spaced relative to both ends of the slots 9a, 9b, with reference to Figure 4, the pivot axes 7a, 7b extend through a plane together with the respective drive shaft axes 8a, 8b of the associated drive motors 16a, 16b, so that they extend perpendicular to the plane extending through the drive shaft axes 8a, 8b and the rotation axes 6a, 6b of the associated lower rollers 2a, 2b, and the drive shaft axes 8a, 8b, the rotation axes 6a, 6b and the pivot axes 7a, 7b extend parallel to one another.

[0037] To adjust the belt tension of the drive belts 3a, 3b, belt tension adjusting pliers 24 are used, which are shown in a perspective view in Fig. 7. The belt tension adjusting pliers have two pliers halves 26a, 26b which are pivotally connected to one another via a joint bolt 25. On one side of the joint bolt 25, the pliers halves 26a, 26b each form a hand grip 27, whereas on the side facing the hand grip 27, the pliers halves 26a, 26b have two function elements arranged at a distance from one another and configured as plug bushes 28a, 28b. The function elements 28a, 28b form respective function element pairs 31a, 31b which are prestressed towards one another with a prestress defined by a prestressing element configured as a tension spring 30. Due to the different spacings from the joint bolt 25 to the functional members 28a, 28b of the functional member pairs 31a, 31b, the functional member pairs 31a, 31b transmit different initial stresses via the plug bolts 28a, 28b.

[0038] The plug bushes 28a, 28b are adapted to the plug bolt 14 and the retaining bolt 13 of the drafting mechanism lower part 18b, so that the belt tension adjusting pliers 24 can be used for adjusting the belt tension of the drive belts 3a, 3b, as shown in Figs. 8 and 9. In the embodiment shown in Fig. 8, the functional part pair 31b serves for adjusting the belt tension of the drive belt 3b connecting the second lower roller 2b with the drive motor 16b. In order to adjust the required drive belt tension by the belt tension adjusting pliers 24, depending on the belt length of the first drive belt 3a, which differs from the belt length of the second drive belt 3b, different prestresses must be applied to the plug bolt 14 and the retaining bolt 13 for the adjustment of the drive motor 16a. For this purpose, the belt tension adjusting pliers 24 are arranged with the plug bush 28a of the functional part pair 31a on the retaining bolt 13 and the plug bolt 14 associated with the drive motor 16a.

[0039] The prestress is determined by a tension spring 30 arranged in a holder 32 of the pliers halves 26a, 26b in the area between the joint bolt 25 and the functional part pair 31a, 31b. The tension spring 30 is then mounted in the holder 32 in an exchangeable manner, so that the belt tensioning pliers 24 can be utilized to adjust different prestresses through the exchange of the tension spring 30. [Explanation of symbols]

[0040] 1 Lower roller support 1a Support member 1b Top side 1c Bottom side 1d Edge side 1e Penetration 2a First Lower Roller 2b Second Lower Roller 3a First Drive Belt 3b Second Drive Belt 4 Belt edge 5 Lower roller bearing 6a, 6b Rotating shaft (lower roller) 7a, 7b Rotation axis 8a, 8b Drive shaft 9a, 9b long hole 10a, 10b Another long hole 11a, 11b Joint bolts 12a, 12b Bearing bush 13 Retaining bolt 14 Socket bolt 15 Locking screw 16a, 16b Drive motor 17 Draft Mechanism 18a, 18b Lower part of draft mechanism 19 Draft mechanism upper part 20 Hand Grips 21 Locking hook 22a, 22b Another long hole 23 Opening 24 Belt tension adjustment pliers 25 Joint bolt 26a First pliers half 26b Second pliers half 27 Hand Grip 28a, 28b Functional parts (insertion bush) 30 Prestressed member (tension spring) 31a, 31b Functional member pair 32 Holder 33 Notch

Claims

1. A draft mechanism (17) for a spinning machine, comprising at least two pairs of rollers, each having an upper roller and a lower roller (2a, 2b), and at least one drive motor (16a; 16b) for driving at least one of the lower rollers (2a, 2b), wherein the at least one drive motor (16; 16b) and the lower roller (2a; 2b) that can be driven by the at least one drive motor (16; 16b) are supported and arranged on a lower roller support (1), and the at least one drive motor (16a; 16b) coupled to the lower roller (2a; 3b) via a drive belt (3a; 3b) is positioned on the lower roller support (1) so as to be spaced apart from the lower roller (2a; 2b) to adjust the drive belt tension, A draft mechanism characterized in that at least one of the drive motors (16a; 16b) is supported by the lower roller support (1) so as to be rotatable about a pivot axis (7a; 7b) and so as to be fixed in an adjusted position.

2. The draft mechanism (17) according to claim 1, characterized in that at least one of the drive motors (16a; 16b) is pivotably supported on the lower roller support (1) such that the pivot shafts (7a; 7b), the drive shafts (8a; 8b) of at least one of the drive motors (16a; 16b), and the rotation axes (6a; 6b) of the attached lower rollers (2a; 2b) are arranged parallel to each other.

3. The draft mechanism (17) according to claim 1 or 2, characterized in that at least one of the drive motors (16a; 16b) is positioned on the lower roller support (1) so as to be adjustable between a final position defining the maximum distance to the lower rollers (2a; 2b) and an initial position defining the minimum distance to the lower rollers (2a; 2b).

4. The draft mechanism (17) according to claim 3, characterized in that at least one of the drive motors (16a; 16b) is rotatably positioned on the lower roller support (1) such that when it is in an intermediate position having a coincident distance from the initial position and the final position, a plane extending through the pivot axis (7a; 7b) and the attached drive shaft axis (8a; 8b) extends perpendicular to a plane extending through the attached drive shaft axis (8a; 8b) and the rotation axis (6a; 6b) of the attached lower roller (2a; 2b).

5. The draft mechanism (17) according to claim 3, wherein the drive motor (16a; 16b) has an insertion bolt (14) extending parallel to an attached retaining bolt (13) in the lower roller support (1), and the retaining bolt (13) and the attached insertion bolt (14) are spaced apart from each other such that a change in their spacing causes positional adjustment of the drive motor (16a; 16b) between the initial position and the final position.

6. The draft mechanism (17) according to claim 5, characterized in that the insertion bolt (14) extends through the notches (9a; 9b; 33) of the lower roller support (1).

7. The draft mechanism (17) according to claim 6, characterized in that the notch (33) is formed on the edge side of the lower roller support (1).

8. The draft mechanism (17) according to claim 1 or 2, characterized in that the lower roller support (1) has an upper surface (1b) and a lower surface (1c), the lower rollers (2a; 2b) are supported and arranged on the upper surface (1b) of the lower roller support (1), a support member (1a) is provided that protrudes perpendicularly from the lower surface (1c), at least one of the drive motors (16a; 16b) is supported on this support member, and the drive belt (3a; 3b) extends from the drive motors (16a; 16b) to the attached lower rollers (2a; 2b) so as to cross the lower surface (1c) and the upper surface (1b) of the lower roller support (1).

9. The draft mechanism (17) according to claim 8, characterized in that the lower roller support (1) has at least one through portion (1e), through which the drive belt (3a; 3b) extends.

10. The draft mechanism (17) according to claim 1 or 2, characterized in that the lower roller support (1) has at least one notch (10a; 10b; 22a; 22b) for housing a locking screw (15) that extends through the lower roller support (1) and secures at least one of the drive motors (16a; 16b) in an adjusted position.

11. A belt tension adjusting pliers (24) for adjusting the drive belt tension of a draft mechanism (17), particularly for a draft mechanism (17) as described in 1 or 2, comprising two pliers halves (26a, 26b) rotatably joined to each other via a coupling bolt (25), one end of each pliers halves being configured as a handgrip (27), and the other end each having functional members (28a, 28b) that jointly form a functional member pair (31a, 31b), the functional members being arranged on the same plane of motion and movable to move toward each other by operation of the pliers halves (26a, 26b), A belt tension adjusting pliers characterized by having an initial stress member (30) that applies an initial stress to the functional members (28a, 28b) that extend perpendicular to the plane of motion and are configured as insertion bushings for housing a retaining bolt (13) and an insertion bolt (14), so that they move closer to each other with a defined initial stress.

12. The belt tension adjusting pliers (24) according to claim 11, characterized in that the functional members (28a, 28b) of a pair of functional members (31a, 31b) are arranged at equal intervals from the joint bolt (25).

13. The belt tension adjusting pliers (24) according to claim 11 or 12, characterized in that it has at least two pairs of functional members (31a, 31b) positioned at different intervals from the joint bolt (25) at the other end of the pliers half (26a, 26b).

14. The belt tension adjusting pliers (24) according to claim 11 or 12, characterized in that the initial stress member is configured as a tension spring (30) positioned on the pliers half (26a, 26b) in the region between the functional member pair (31a, 31b) and the joint bolt (25).

15. A system for tensioning the drive belt (3a; 3b) of a draft mechanism (17) as described in claim 1 or 2, comprising a draft mechanism (17) as described in claim 11 or 12, The system is characterized in that the insertion bushings (28a, 28b) positioned on the belt tension adjustment pliers (24) are adapted to match the insertion bolt (14) and retaining bolt (13) of the draft mechanism (17).

16. The system according to claim 15, characterized in that the initial stress member (30) of the belt tension adjustment pliers (24) is configured such that the belt tension adjustment pliers (24) positioned on the retaining bolt (13) and the insertion bolt (14) apply an initial stress to the drive belt (3a, 3b) with a set belt tension.

17. The system according to claim 15, wherein the draft mechanism (17) has at least two pairs of rollers, each having a drive motor (16a, 16b) coupled to a lower roller (2a, 2b), and the belt tension adjusting pliers (24) has two pairs of functional members (31a, 31b) for adjusting different belt tensions.

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