DRAFTING SYSTEM AND DRAFTING SYSTEM UNIT FOR A SPINNING MACHINE

Abstract

A drafting system for a spinning machine, which drafting system has a drafting system unit, and to such a drafting system unit, having at least one weighting arm, which can be pivoted between an operating position and an open position by a repositioning device. In order to provide a drafting system and a drafting system unit for a drafting system for a spinning machine, the drafting system unit having a particularly simple design and permitting user-friendly operation, it is provided that the at least one weighting arm is connected to a retaining rod for conjoint rotation, which retaining rod is mounted on a retaining rod holder for rotation about the longitudinal axis of the retaining rod by the repositioning device.

Claims

1. A drafting system unit for a spinning machine, comprising at least one weighting arm, which can be pivoted between an operating position and an open position by a repositioning device, characterized in that: the at least one weighting arm is connected to a retaining rod for conjoint rotation, which retaining rod is mounted on a retaining rod holder for rotation about the longitudinal axis of the retaining rod by the repositioning device.

2. The drafting system unit according to claim 1, characterized in that the repositioning device has a knee lever assembly, which is operatively connected to the retaining rod and which can be repositioned between a closing position associated with the operating position and an opening position associated with the open position.

3. The drafting system unit according to claim 2, characterized in that in the closing position the knee lever assembly is arranged in a position beyond dead center.

4. The drafting system unit according to claim 2, characterized in that the knee lever assembly has a first knee lever and a second knee lever, the first knee lever being pivotable about a first joint axis, which is stationary relative to the retaining rod, the first knee lever and the second knee lever being articulated to each other by a knee lever joint axis, and the second knee lever having a knee lever portion spaced apart from the knee lever joint axis, which knee lever portion is connected to the retaining rod so as to transmit a rotational motion.

5. The drafting system unit according to claim 3, characterized in that in the closing position the knee lever assembly is arranged in a position beyond dead center.

6. The drafting system unit according to claim 4, characterized in that the second knee lever is articulated, at an end opposite the knee lever joint axis and constituting a knee lever portion, to a link by a second joint axis, which link is connected, at the end thereof opposite the second joint axis, to the retaining rod for conjoint rotation.

7. The drafting system unit according to claim 6, characterized in that the knee lever assembly can be repositioned between the operating position and the closing position by a hand lever.

8. The drafting system unit according to claim 7, characterized in that the hand lever can be pivoted, together with the first knee lever, about the first joint axis.

9. A drafting system for a spinning machine, comprising a drafting system unit, which has at least one weighting arm, which can be pivoted between an operating position and an open position by a repositioning device, characterized in that: the at least one weighting arm is connected to a retaining rod for conjoint rotation, which retaining rod is mounted on a retaining rod holder for rotation about the longitudinal axis of the retaining rod by the repositioning device.

10. The drafting system according to claim 9, characterized in that the repositioning device has a knee lever assembly, which is operatively connected to the retaining rod and which can be repositioned between a closing position associated with the operating position and an opening position associated with the open position.

11. The drafting system according to claim 10, characterized in that in the closing position the knee lever assembly is arranged in a position beyond dead center.

12. The drafting system according to claim 10, characterized in that the knee lever assembly has a first knee lever and a second knee lever, the first knee lever being pivotable about a first joint axis, which is stationary relative to the retaining rod, the first knee lever and the second knee lever being articulated to each other by a knee lever joint axis, and the second knee lever having a knee lever portion spaced apart from the knee lever joint axis, which knee lever portion is connected to the retaining rod so as to transmit a rotational motion.

13. The drafting system according to claim 12, characterized in that in the closing position the knee lever assembly is arranged in a position beyond dead center.

14. The drafting system unit according to claim 12, characterized in that the second knee lever is articulated, at an end opposite the knee lever joint axis and constituting a knee lever portion, to a link by a second joint axis, which link is connected, at the end thereof opposite the second joint axis, to the retaining rod for conjoint rotation.

15. The drafting system unit according to claim 14, characterized in that the knee lever assembly can be repositioned between the operating position and the closing position by a hand lever.

16. The drafting system unit according to claim 15, characterized in that the hand lever can be pivoted, together with the first knee lever, about the first joint axis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] An embodiment example of the invention is explained below with reference to the drawing. The following is shown in the drawings:

[0028] FIG. 1 is a side view of a drafting system unit of a spinning machine in an operating position of a weighting arm;

[0029] FIG. 2 is a side view of the drafting system unit of FIG. 1 in an open position of the weighting arm; and

[0030] FIG. 3 is a top view of the drafting system unit of FIG. 1 in the operating position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] A drafting system unit 1 presented in FIG. 1, of a spinning machine not shown in greater detail here, serves to draft a sliver between the pressure rollers 15a, 15b, 15c, which are arranged on a support arm 16 of a weighting arm 3, and the further lower rollers 14a, 14b, 14c of the drafting system, which is not shown here. For this purpose, the roller pairs, which are each formed by one of the lower rollers 14a, 14b, 14c and one of the pressure rollers 15a, 15b, 15c, have a different rotational speed, which increases in the transporting direction, so that the sliver is drafted in the region between the roller pairs.

[0032] In the presented embodiment example, the drafting system unit 1 has two weighting arms 3, which are arranged parallel to each other on a retaining rod 4 and which each have a support arm 16, each having three pressure roller pairs formed by two pressure rollers 15a, 15b, 15c, the axes of rotation of which extend perpendicularly to the longitudinal axis of the associated support arm 16. The support arms 16 are each rigidly connected to two support bodies 17, which are arranged on both sides of the support arm 16 and which in turn are connected to a retaining rod 4 for conjoint rotation (see FIG. 3).

[0033] In the operating position of the support arms 16, which is presented in FIG. 1, the pressure rollers 15a, 15b, 15c are in contact with the lower rollers 14a, 14b, 14c in order to thus draft the sliver arranged therebetween. In order to load or equip the spinning machine, the sliver must be arranged between the lower rollers 14a, 14b, 14c and the pressure rollers 15a, 15b, 15c. For this purpose, the weighting arms 3 can be pivoted out of the operating position, which is presented in FIG. 1, into an open position, which is presented in FIG. 2, in which open position the pressure rollers 15a, 15b, 15c are lifted from the lower rollers 14a, 14b, 14c.

[0034] In order to reposition the weighting arms 3 from the operating position into the open position, a repositioning device 2 is provided, which pivots the support arm 16, together with the support bodies 17 connected to the support arm 16, about a longitudinal axis of the retaining rod 4. Pivoting results from rotation of the retaining rod 4, which is rotatably mounted on a retaining rod holder 5, e.g. a machine housing. Because of the arrangement of the support bodies 17 on the retaining rod 4 for conjoint rotation, rotation of the retaining rod 4 in the retaining rod holder 5 causes movement of the weighting arm 3 in accordance with the rotational motion of the retaining rod 4 caused by the repositioning device.

[0035] In order to reposition the retaining rod 4, the repositioning device 2 has a knee lever assembly 6, which can be repositioned between a closing position associated with the operating position and an opening position associated with the open position by a hand lever 13.

[0036] The knee lever assembly 6 has a first knee lever 7, which according to a preferred embodiment example can be pivoted at the retaining rod holder 5 about a first joint axis 9. According to another preferred embodiment example, which is not presented, the retaining rod holder and the first joint axis are spaced apart from each other. At the end opposite the first joint axis 9, the first knee lever 7 is connected to the second knee lever 8 by a knee lever joint axis 11. The second knee lever 8 is connected, at a knee lever portion spaced apart from the knee lever joint axis 11, in this preferred embodiment example at the end of the second knee lever 8 opposite the knee lever joint axis 11, to a link 12 by a second joint axis 10, which link 12 is connected, at the end opposite the second joint axis 10, to the retaining rod 4 for conjoint rotation so that the rotation of the link 12 causes a repositioning of the retaining rod 4 and thus a movement of the weighting arm 3. In order to reposition the knee lever assembly 6, a hand lever 13 is used, which can be pivoted about the first joint axis 9 and interacts with the knee lever assembly 6. According to a preferred embodiment example, the hand lever 13 is rigidly connected to the first knee lever 7, and thus movement of the hand lever 13 leads directly to actuation of the first knee lever 7. In a preferred manner, the hand lever 13 and the first knee lever 7 are configured from one material piece. In an alternatively preferred manner, the hand lever 13 and the first knee lever can be configured from two material pieces, which are connected to each other, for example by typical measures of interlocking connection, bonded connection or frictional connection.

[0037] In order to reposition the knee lever assembly 6 from the closing position, which is presented in FIG. 1, into the opening position, which is presented in FIG. 2, the hand lever 13 transfers the knee lever assembly 6 from a position beyond dead center into the opening position. In order to move the weighting arm 3 into the operating position, merely an opposite reverse movement of the hand lever 13 from the open position, which is presented in FIG. 2, into the operating position, which is presented in FIG. 1, is required, the hand lever 13 transferring the knee lever assembly 6 into the position beyond dead center.

LIST OF REFERENCE NUMBERS

[0038] 1 Drafting system unit [0039] 2 Repositioning device [0040] 3 Weighting arm [0041] 4 Retaining rod [0042] 5 Retaining rod holder [0043] 6 Knee lever assembly [0044] 7 First knee lever [0045] 8 Second knee lever [0046] 9 First joint axis [0047] 10 Second joint axis [0048] 11 Knee lever joint axis [0049] 12 Link [0050] 13 Hand lever [0051] 14a, 14b, 14c Lower rollers [0052] 15a, 15b, 15c Pressure rollers [0053] 16 Support arm [0054] 17 Support body

[0055] 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.