APRON DRAFTING SYSTEMS

Abstract

An apron drafting system for a spinning machine, in particular an air spinning machine, with a bottom apron guided over a drivable bottom roller, the bottom apron being supported in the area of a drawing zone, in particular a main drawing zone, by a sliding section of an apron bridge. In order to provide an apron drafting system in which reliable guidance of the bottom apron is ensured while maintaining a high drive power, there is provision for the apron bridge for guiding the bottom apron to have a line section with guiding means for lateral guidance of the bottom apron circulating around the apron bridge.

Claims

1. An apron drafting system for a spinning machine with a bottom apron guided over a drivable bottom roller, the bottom apron being supported in the area of a drawing zone by a sliding section of an apron bridge, characterized in that the apron bridge for guiding the bottom apron has a line section with a guide for lateral guidance of the bottom apron circulating around the apron bridge.

2. The apron drafting system according to claim 1, wherein the spinning machine is an air spinning machine.

3. The apron drafting system according to claim 1, wherein the drawing zone is a main drawing zone.

4. The apron drafting system according to claim 1, characterized in that the apron bridge has two guide bars arranged at a distance from one another and laterally enclosing the bottom apron in the area of the line section.

5. The apron drafting system according to claim 1, characterized in that the guide bars have a sliding coating in the area of contact with the bottom apron.

6. The apron drafting system according to claim 1, characterized in that the guide bars are arranged on a stabilizing bar which is arranged in an area of the apron bridge opposite the sliding section.

7. The apron drafting system according to claim 1, characterized in that adjustment of a drafting system carriage with the bottom roller, the bottom apron and the apron bridge and/or the apron bridge in relation to the drafting system carriage, is transverse to the circumferential direction of the bottom apron.

8. The apron drafting system according to claim 7, characterized in that the apron bridge and/or the drafting system carriage is connected to an adjusting drive for adjustment of the apron bridge in relation to the drafting system carriage and/or of the drafting system carriage transversely to the circumferential direction of the bottom apron.

9. The apron drafting system according to claim 1, characterized in that the adjusting drive is connected to a control device for defining the adjustment movement of the drafting system carriage and/or the apron bridge.

10. The apron drafting system according to claim 9, wherein the adjusting drive is connected to a control device for defining the adjustment length and the adjustment frequency.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will become more fully understood from the detailed description and the accompanying drawings wherein:

[0029] FIG. 1 shows a perspective view of a roller pair arrangement of an apron drafting system according to an embodiment example;

[0030] FIG. 2 shows a perspective view of a drafting system carriage of the apron drafting system of FIG. 1 according to an embodiment example;

[0031] FIG. 3 shows a perspective view of an apron bridge of the drafting system carriage of FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] The following description of the embodiments of the present invention is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. The following description is provided herein solely by way of example for purposes of providing an enabling disclosure of the invention, but does not limit the scope or substance of the invention.

[0033] FIG. 1 depicts a perspective representation of a roller pair arrangement 1 of an apron drafting system which can be assigned to a spinning position (not depicted here) of a textile machine, which apron drafting system can be fixed to the textile machine. The roller pair arrangement 1 has four first to fourth top rollers 23, 24, 25, 26 arranged one behind the other in the running direction of a fiber band not depicted here running through the roller pair arrangement 1, which are opposite corresponding, drivable first to fourth bottom rollers 3, 4, 5, 6. The first to fourth bottom rollers 3, 4, 5, 6 include the infeed roller 3, which is the first to come into contact with the fiber band, can be driven by a roller drive and represents the first bottom roller of the roller pair arrangement 1. The infeed roller 3 can be arranged together with the roller drive on a first drafting system carriage 8a.

[0034] A first drawing roller 4 is installed downstream of the infeed roller 3 in the fiber band running direction and is arranged on a second drafting system carriage 8b. A second drawing roller 5 follows the drawing roller 4 in the fiber band running direction and is arranged on a third drafting system carriage 8c. The first 4 and second drawing roller 5 can each be coupled with their own roller drive, which can also be arranged on the corresponding second 8b or third drafting system carriage 8c.

[0035] The second drawing roller 5 does not come into direct contact with a fiber band to be drawn, but has a bottom apron 10 circulating around the drawing roller 5 and coming into contact with the fiber band. The bottom apron 10 is implemented as an endless band and, in addition to the second drawing roller 5, also circulates around an apron bridge 9 arranged on supports 11a, 11 b of the third drafting system carriage 8c, in which case the supports 11a, 11b are arranged on a basic body 17. In the area of the third drafting system carriage 8c, the bottom apron 10 rests against a sliding section 22 of the apron bridge 9 facing the bottom apron 10. The bottom apron 10 is supported via the sliding section 22, so that the bottom apron 10 cannot divert in the direction of the third drafting system carriage 8c (see FIGS. 2 and 3).

[0036] On the side opposite the sliding section 22, the apron bridge 9 has two guide bars 13 which project at a distance from one another from an underside and form a line section 18, which rest against the side of the bottom apron 10 and serve as guiding means for the bottom apron 10. The guide bars 13 are in contact with a bar 12 arranged on the underside in the longitudinal axis direction of the apron bridge 9, which stabilizes the apron bridge 9.

[0037] The apron bridge 9 itself is moveably mounted on the support 11a and in a receptacle 14 of the support 11b, so that the apron bridge 9 can be adjusted transversely to the fiber running direction or to the running direction of the bottom apron 10 via an adjusting drive (not depicted here) for the apron bridge 9. A traversing movement of the bottom apron 10 can thus be performed via the guide bars 13 resting against the bottom apron 10, in which case a control device (not depicted here) connected to the actuating drive defines the traversing speed as well as the traversing breadth.

[0038] The fiber band drafted in the roller pair arrangement 1 passes over an outfeed roller 6, which is arranged on a fourth drafting system carriage 8d, into a spinning unit (not depicted here), which follows the drafting system 1. The first to fourth drafting system carriages 8a, 8b, 8c, 8d can be arranged on a frame (not depicted) of the apron drafting system by means of suitable attachment points.

[0039] In an embodiment example not depicted here, an adjustment of the third drafting system carriage 8c transversely to the circulating direction of the bottom apron 10 or the fiber running direction is provided in addition to or as an alternative to the adjustment of the apron bridge 9 in relation to the third drafting system carriage 8c. The adjustment of the third drafting system carriage 8c can be carried out by means of an adjusting drive according to a preferable embodiment example, in which case the adjustment of the third drafting system carriage 8c can ideally be guided via at least one slot and a guide element projecting into it. In this way, a slot that can be provided in the drafting system carriage for fine adjustment of its position can be used in a simple manner for the traversing movement of the drafting system carriage. Drafting system carriages configured in this manner can therefore be used for an apron drafting system either with or without a traversing movement of the bottom apron. In order to improve the guiding stability, more than one slot can be provided in a particularly preferable embodiment.

[0040] In a further embodiment example not depicted here, the bottom apron is arranged in the same or a similar way in what is referred to as a pre-drawing field in addition to or as an alternative to the arrangement depicted in a main drawing field, this pre-drawing field being located upstream of the main drawing field in the transporting direction of the fiber band and being configured between two roller pairs lying in the transporting direction of the fiber band, which have rotational speeds that differ from one another. In this case too, traversing of the bottom apron can be carried out in a further preferable manner in the same or a similar way.

LIST OF REFERENCE SIGNS

[0041] 1 Roller pair arrangement [0042] 3 Infeed roller [0043] 4 First drawing roller [0044] 5 Second drawing roller [0045] 6 Outfeed roller [0046] 8a First drafting system carriage (for the infeed roller) [0047] 8b Second drafting system carriage (for the first drawing roller) [0048] 8c Third drafting system carriage (for the second drawing roller) [0049] 8d Fourth drafting system carriage (for the outfeed roller) [0050] 9 Apron bridge [0051] 10 Bottom apron [0052] 11a Support [0053] 11b Support [0054] 12 Bar [0055] 13 Guide bar (guiding means) [0056] 14 Receptacle [0057] 17 Basic body [0058] 18 Line section [0059] 22 Sliding section [0060] 23 First top roller [0061] 24 Second top roller [0062] 25 Third top roller [0063] 26 Fourth top roller

[0064] It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiments, adaptations, variations, modifications and equivalent arrangements.