FIBRE BAND OPENING DEVICE FOR AN OPEN-END SPINNING DEVICE AND FEED TRAY FOR THE FIBRE BAND OPENING DEVICE

Abstract

Fibre band opening device for an open-end spinning device and feed tray for the fibre band opening device. The feed tray has a clamping surface, which is designed to transport, in conjunction with a fibre band pull-in cylinder, a feed fibre band towards an opening roller having an opening roller clothing, the tips of which lie on a circular cylindrical surface, a support surface for fixing a fibre tuft, which is processed by the opening roller by combining, the distance of which support surface from the circular cylindrical surface is tapered in the fibre transport direction to a minimum distance, and a transition area having a convex curvature between the clamping surface and the support surface. The support surface has a distance of between 4 and 8 millimetres from the circular cylindrical surface at the beginning of the support surface with respect to the fibre transport direction, and the minimum distance of the support surface from the circular cylindrical surface is less than 1.5 millimetres.

Claims

1. A fibre band opening device for an open-end spinning device, comprising: a feed tray, a fibre band pull-in cylinder and an opening roller having an opening roller clothing, the tips of which lie on a circular cylindrical surface, wherein the fibre band pull-in cylinder is designed to transport, in conjunction with a clamping surface of the feed tray, a feed fibre band towards the opening roller, the feed tray has a support surface for fixing a fibre tuft, which is processed by the opening roller by combing, and the distance of the support surface from the circular cylindrical surface is tapered in the fibre transport direction to a minimum distance, and the feed tray has a transition area having a convex curvature between the clamping surface and the support surface, characterised in that the support surface has a distance of between 4 and 8 millimetres from the circular cylindrical surface at the beginning of the support surface with respect to the fibre transport direction and that the minimum distance of the support surface from the circular cylindrical surface is less than 1.5 millimetres.

2. The fibre band opening device according to claim 1, characterised in that the minimum distance of the support surface from the circular cylindrical surface is greater than 0.5 millimetres, preferably greater than 0.6 millimetres.

3. The fibre band opening device according to claim 1, characterised in that the tapering of the distance of the support surface from the circular cylindrical surface from the beginning of the support surface to the minimum distance extends over an angle range of less than 30 in the direction of rotation of the opening roller.

4. The fibre band opening device according to claim 1, characterised in that the support surface is designed as a flat surface from the beginning of the support surface until the minimum distance from the circular cylindrical surface is reached.

5. The fibre band opening device according to claim 1, characterised in that the support surface continues in the fibre transport direction at a constant distance from the circular cylindrical surface after the minimum distance has been reached.

6. The fibre band opening device according to claim 1, characterised in that the support surface comprises a concave surface.

7. The fibre band opening device according to claim 1, characterised in that the support surface comprises a flat surface, which transitions tangentially into a concave surface.

8. The fibre band opening device according to claim 1, characterised in that the feed tray has, in the area of the support surface, lateral guide walls for guiding the feed fibre band, which extend from the beginning to the end of the support surface.

9. A feed tray for a fibre band opening device according to claim 1, comprising: a clamping surface, which is designed to transport, in conjunction with a fibre band pull-in cylinder, a feed fibre band towards an opening roller having an opening roller clothing, the tips of which lie on a circular cylindrical surface, a support surface for fixing a fibre tuft, which is processed by the opening roller by combing, the distance of the support surface from the circular cylindrical surface being tapered in the fibre transport direction to a minimum distance, and a transition area having a convex curvature between the clamping surface and the support surface, characterised in that the support surface has a distance of between 4 and 8 millimetres from the circular cylindrical surface at the beginning of the support surface with respect to the fibre transport direction and that the minimum distance of the support surface from the circular cylindrical surface is less than 1.5 millimetres.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is explained in greater detail below on the basis of an embodiment example shown in the figures. In the figures:

[0021] FIG. 1 is a front view of a fibre band opening device according to the present invention;

[0022] FIG. 2 is a three-dimensional illustration of an opening roller housing with a feed tray according to the present invention;

[0023] FIG. 3 is a detailed view of the fibre band opening device according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] 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.

[0025] FIG. 1 shows an opening roller housing 1 of a fibre band opening device for an open-end spinning device. In this opening roller housing 1, an opening roller 2 is mounted for rotation about an axis of rotation 22. The opening roller 2 has, on its outer circumference, what is known as an opening roller clothing 3 for combing a feed fibre band 4. The opening roller clothing 3 comprises teeth, the tips of which lie on a circular cylindrical surface 13, which delimits the opening roller 2. The opening roller 2 runs in the direction of the arrow 5 during the spinning operation.

[0026] A fibre band pull-in cylinder 7 rotatable in the direction of the arrow 6 is also mounted in or on the opening roller housing 1. This fibre band pull-in cylinder 7 corresponds with a clamping surface 10 of a feed tray 11, which is pivotably mounted by means of a feed tray holder 8. As indicated in FIG. 1, the feed fibre band 4, which is usually stored in a spinning can (not shown), is conducted in the direction of the arrow 15, via a condenser 9, into a clamping zone, which is formed by the feed tray 11 and the fibre band pull-in cylinder 7. The feed tray holder 8 with the feed tray 11 is mounted for limited movement about a pivot axis 16 and is acted upon by a spring element (not shown) in the direction of the arrow 17 against this direction of movement. The feed tray 11 presses the feed fibre band 4 onto the fibre band pull-in cylinder 7, which rotates in the direction of the arrow 6. The fibre band pull-in cylinder 7 conveys the feed fibre band 4 into the area of the opening roller 2, the opening roller clothing 3 of which combs the feed fibre band 4 into individual fibres, which subsequently, as is known, pass a trash outlet opening 24 and are fed via a fibre guide channel 25 onto a spinning rotor (see FIG. 2).

[0027] In FIG. 3, the feed tray 11 and its arrangement in relation to the fibre band pull-in cylinder 7 and to the opening roller 2 are shown in greater detail. In the embodiment example shown, the feed tray 11 is detachably connected to the feed tray holder 8, as is also disclosed in DE 10 2017 118 392 A1 for example. In the present invention, the feed tray 11 and the feed tray holder 8 can also be formed as a single piece, or the feed tray 11 can consist of several parts connected to one another by means of the feed tray holder 8.

[0028] The fibre band pull-in cylinder 7 transports the feed fibre band 4, in conjunction with the clamping surface 10 of the feed tray 11, towards the opening roller 2. Following the clamping surface 10 of the feed tray 11, the feed fibre band 4 runs through a transition area 20 of the feed tray 11 having a convex, i.e. outwardly curved, curvature. At the end of the transition area 20, i.e. after the end of the convex curvature, a support surface 14 for fixing the fibre tuft processed by the opening roller 2 begins. The comb-in point lies between the transition area 20 and the support surface 14. In the embodiment example shown, the support surface 14 comprises two partial surfaces 14a and 14b. The surface 14a that is first in the fibre transport direction is flat or plane. At the comb-in point, the surface 14a has a distance from the circular cylindrical surface 13 on which the tips 12 of the opening roller clothing 3 lie, which distance is given the reference sign 18. The distance is the perpendicular from the support surface 14 onto the circular cylindrical surface 13 on which the tips 12 of the opening roller clothing 3 lie. This distance is tapered in the fibre transport direction to a minimum distance. In the embodiment example shown, the distance of the flat partial surface 14a is tapered to the minimum distance 19. The following partial surface 14b is concave, i.e. inwardly curved. The surface 14b is likewise in the form of a circular cylindrical surface, the centre axis corresponding to the axis of rotation 22 of the opening roller 2. That means the distance of the surface 14b from the circular cylindrical surface 13 on which the tips 12 of the opening roller clothing 3 lie corresponds continuously to the minimum distance 19. According to the present invention, the distance 18 is between 4 and 8 millimetres and the distance 19 is less than 1.5 millimetres. In the embodiment example shown, the distance 19 is also greater than 0.6 millimetres.

[0029] The tapering of the distance of the support surface 14, or more precisely of the partial surface 14a, from the circular cylindrical surface 13 from the beginning of the support surface 14 to the minimum distance 19 extends over an angle range in the direction of rotation of the opening roller 2, which angle range is labelled with the reference sign 21. This angle range 21 is less than 30 in the embodiment example shown.

[0030] The feed tray 11 shown in FIG. 2 and in FIG. 3 also has, in the area of the support surface 14, lateral guide walls 23 for guiding the feed fibre band 4, which extend from the beginning to the end of the support surface 14, i.e. over both partial surfaces 14a and 14b.

LIST OF REFERENCE SIGNS

[0031] 1 Opening roller housing [0032] 2 Opening roller [0033] 3 Opening roller clothing [0034] 4 Feed fibre band [0035] 5 Arrow [0036] 6 Arrow [0037] 7 Fibre band pull-in cylinder [0038] 8 Feed tray holder [0039] 9 Condenser [0040] 10 Clamping surface [0041] 11 Feed tray [0042] 12 Tips of the opening roller clothing [0043] 13 Circular cylindrical surface [0044] 14 Support surface [0045] 15 Arrow [0046] 16 Pivot axis [0047] 17 Arrow [0048] 18 Distance [0049] 19 Distance [0050] 20 Transition area [0051] 21 Angle [0052] 22 Axis of rotation of the opening roller [0053] 23 Lateral guide walls [0054] 24 Trash outlet opening [0055] 25 Fibre guide channel

[0056] 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.