CN108138386B

CN108138386B - Cutting device

Info

Publication number: CN108138386B
Application number: CN201680061737.1A
Authority: CN
Inventors: R.纳格里
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2015-10-28
Filing date: 2016-10-13
Publication date: 2022-07-19
Anticipated expiration: 2036-10-13
Also published as: CH711691A1; EP3368708A1; CN108138386A; EP3368708B1; WO2017072619A1

Abstract

The invention relates to a spindle (1) for a workstation of a textile machine, in particular a ring spinning machine, the spindle (1) having: a shaft (2) for accommodating the tube, the shaft (2) becoming a cop (3) as a result of the winding of the wire; and a cutting device (5, 15, 20) for cutting the thread when removing the cop (3) from the spindle (1), wherein the cutting device (5, 15, 20) has a cutting section (11) for closing the shaft (2), an inner region (12, 24) adjacent to the cutting section (11), and a cutting region (10, 16, 21). According to the invention, the inner region (12, 24) of the cutting device (5, 15, 20) has at least one clamping region (13, 25) for clamping the cutting device (5, 15, 20) to the shaft (2). The invention also relates to a cutting device (5, 15, 20) for cutting the thread when removing the cop (3) from the spindle (1).

Description

Cutting device

Technical Field

The invention relates to a spindle for a workstation of a textile machine, in particular a ring spinning machine, according to the application. The invention also relates to a cutting device and a ring spinning machine with a plurality of working stations.

Background

A ring spinning machine spindle with a cutting device for cutting off a spun yarn when removing a cop is known, for example from EP 911434B 1, wherein the cutting device is guided by a collar on the top of the spindle and is fixed on the top of the spindle with a projection which engages behind a groove in the top of the spindle. However, this type of fastening assumes a groove in the top of the spindle, which is known to be provided only on few special spindles. Therefore, the cutting device cannot be used for any other spindle.

EP0292856a1 discloses an upper ring with a cut-out region and a flange. The ring is attached to the upper end of the bottom of the spindle, which is a drawback, and it is therefore difficult to loosen the shaft, which is a drawback. Due to the fastening, it is even impossible to simply replace the cutting ring. Furthermore, there is a relatively high risk of injury to the operator due to the protruding teeth.

DE 2215251a1 discloses a ring with teeth and grooves, which is placed above the lower section of the bobbin. However, the presence of the rings on the bobbins is a drawback, namely that each bobbin must be equipped with a ring, which is not an insignificant cost factor. Furthermore, there is still a high risk of injury, since the wire barrel must be replaced frequently by the operator, and the teeth can injure the operator gripping it.

EP0458088a1 relates to a thread cutting device for a spindle on a spinning or twisting machine with an annular body, which is located between a tube socket of the spindle and a winding station of the spindle, serves to fix a spinning thread and has an edge projecting radially away from the spindle and is provided with a plurality of notches tapering inward at an acute angle to a point, the edges of which are embodied as cutting edges. Fastening to the shaft is disadvantageous and is achieved by the cover being provided with an internal catch projection. The risk of injury here too cannot be underestimated due to the pointed tip of the protrusion.

Disclosure of Invention

The object of the invention is therefore to produce a spindle with a corresponding cut-off device, wherein the cut-off device can be attached to the shaft in the simplest possible manner.

This object is achieved by a spindle with a shaft and a cutting device, a cutting device and a ring spinning machine with a plurality of work stations, each work station having a spindle with a cutting device, which have the features of the present application.

A spindle for a workstation on a textile machine, in particular a ring spinning machine, is proposed. The spindle has a shaft that receives the sleeve. The thread is wound onto the sleeve so that the sleeve becomes a cop. In addition, the spindle has a cutting device which cuts the thread when the cop is pulled out of the spindle, so that the cop can be freely removed and the thread remaining on the textile machine can be wound onto a new tube.

The cutting device has a recess for closing the shaft so that some of it can be placed around the shaft. The inner region is adjacent to the recess. In addition, the cutting device has a cutting area where the wire is finally cut.

According to the invention, the spindle has a spindle bottom adjacent to the shaft, the cutting device is cut off from the spindle bottom, i.e. is a separate element, and the inner region of the cutting device has at least one clamping region. The cutting device is clamped to the shaft by means of the clamping region. The cutting device is firmly fastened to the spindle shaft by this clamping. Furthermore, the spindle does not need to have any special fastening device(s), since clamping on a conventional shaft is possible. Finally, due to the clamping, the cutting device can also be easily replaced, for example when it becomes dull.

At least one clamping area is advantageously circular. In order for the clamping to be possible, the diameter of the circular clamping area must be smaller than or equal to the diameter of the shaft at the lower end of the shaft, at which the cutting device is usually attached. The severing device can be fastened particularly firmly because the circular clamping region clamps around the entire circumference of the spindle.

However, other shapes of the at least one clamping area are also possible. It is advantageous if the diameter of the circle described in the at least one clamping area, i.e. the diameter of the largest circle fitting into the recess, is smaller than or equal to the diameter of the lower end of the shaft. In this way a strong clamping is ensured.

In an advantageous development of the invention, the cutting device has a groove, wherein one end of the groove is arranged on the recess. A larger deformation of the shut-off device is possible through the groove and this in turn allows a better clamping.

Furthermore, the severing device can advantageously have a specially designed inner region with three severing clamping zones. Clamping is also very effective with these three clamping areas. The creation of the slots may be omitted or the slots may be used in addition.

It is also advantageous if the cut-off areas have rounded edges, cusps and/or protrusions. The particular embodiment of the cutting area may be adapted to additional features of the spindle, for example the geometry of the gripping crown and the characteristics of the thread to be used. Furthermore, the cutting device can advantageously be designed flat and located on the ingot bottom. This is particularly advantageous, since this is a space-saving embodiment variant.

It is advantageous if the rounded edges, cusps and/or protrusions are at least partially sharp. The use of a sharp element allows for an even easier cutting of the line.

It is also advantageous if the shut-off device is designed in one piece. Firstly, this allows to advantageously produce a cut-off device; second, this makes the production more stable. The cutting device is advantageously made of metal which can be polished without problems and which has the elasticity required for clamping.

In an advantageous development of the invention, the cut-off region has an outer diameter which is smaller than or equal to the diameter of the ingot bottom. The cutting-off area is therefore recessed, which considerably reduces the risk of injury to the operator, for example due to cutting on a sharp element.

For better positioning of the wire, the ingot bottom has notches. It is advantageous if the outer diameter of the severing zone is equal to or greater than the inner diameter formed by the base of the recess. The wire can thus come into contact with the severing zone and be severed there.

In addition, it is advantageous if the ingot bottom is a clamping crown. Shortly before the cop is removed, several loops of thread are wound onto the clamping crown and fixed there. The thread then travels over the cutting zone and is cut there as the cop is removed from the spindle. In a corresponding design of the clamping crown, the shut-off device can also be clamped on the clamping crown.

Furthermore, a cutting device for cutting the thread when removing the cop from the spindle as described above is also proposed. The spindle has a shaft here, and the cutting device comprises a recess for winding the spindle and/or the shaft, an inner region adjacent to the recess, and a cutting region. According to the invention, the inner region has at least one clamping region for clamping the cutting device on the spindle and/or on the shaft. Due to this clamping, the cutting device can be attached to the spindle without problems, without the spindle having to have special features.

At least one clamping area is advantageously circular. Since the circular clamping region clamps over the entire circumference of the spindle, the cutting device can be fastened particularly firmly to the spindle and/or the shaft.

Furthermore, it is advantageous if the cutting device has a slot, one end of which is located at the recess. Due to the groove, a greater deformation of the cutting device is possible, which in turn allows a better clamping.

It is also advantageous if the slot has at least one corner. In a few cases, the wire can be pulled up along a continuous straight groove to the spindle axis where it is difficult to remove. Due to the at least one corner in the groove, the wire generally remains captured at the first corner and cannot penetrate to the shaft, so that the wire is subsequently more easily removed and/or can be removed solely due to centrifugal forces.

Furthermore, the severing device can advantageously have a specially designed inner region with three separate clamping regions 25. Clamping is very efficient with these three clamping areas. The creation of a groove may be eliminated or a groove may be additionally used.

In an advantageous development of the invention, the severing zone has rounded edges, cusps and/or projections. Depending on the particular features of the spindle and the type of thread, some shaped separation zones are more suitable than others for severing the thread. It is advantageous if the rounded edges, cusps and/or protrusions are at least partially sharp. This is because the wire can be cut more easily by the sharp element.

It is also advantageous if the shut-off device is designed as one component. Firstly, this allows to advantageously produce the cut-off device, and secondly, it makes the cut-off device more robust. The cutting device is advantageously made of metal which can be polished without problems and which provides the elasticity required for clamping. It is advantageous if the cutting device is manufactured by stamping, since this is cheap and feasible with the desired accuracy.

Furthermore, a ring spinning machine with a plurality of work stations is proposed. Each work station has a spindle with a cutting device for cutting the thread when removing the cop from the spindle. According to the invention, the spindle is designed as described above. The cutting device assigned to the spindle can be easily attached to the spindle and can also be easily replaced if the cutting device becomes dull or another cutting device suitable for another thread is used.

Drawings

Additional advantages of the present invention are described in the following examples, in which

Figure 1 shows a side view of a spindle;

figure 2a shows a side view of the clamping crown in an open state;

figure 2b shows a side view of the clamping crown from figure 2a in a closed state;

Figure 3a shows a top view of the cutting device;

FIG. 3b shows a top view of the cutting device from FIG. 3a on a clamping ring;

FIG. 4a shows a top view of another embodiment of a cutting device; and

fig. 4b shows a top view of another embodiment of the cutting device.

Only the features important to the present invention are presented. Like features are labeled with like numerals in the different figures.

Detailed Description

Fig. 1 shows a side view of a spindle 1. The cop 3 is located on the shaft 2 of the spindle 1. Adjacent to the shaft 2 of the spindle 1, there is a clamping crown 4. In addition, a cutting device 5 separate from the clamping crown is arranged on the clamping crown 4, although hardly visible here, but is designed flat and is located on the clamping crown 4. Cutting means, cutting edges, etc. are suitable as severing means 5, as described in the following examples.

Fig. 2a shows the clamping crown 4 in more detail in the open state, since it occurs shortly before the cop 3 is removed from the spindle 1. The clamping sleeve 6 has been pulled down in the process, so that the winding lower region 7 is opened. Then, several turns of the wire are wound onto the winding-down region 7. Between the cop 3 and the winding lower region 7, the thread runs through a notch in the clamping ring 8 and thus also over the cutting device 5.

Then, as shown in fig. 2b, the clamping sleeve 6 is moved into the upper position again, so that the wire is clamped firmly in the clamping crown 4. If the cop 3 is then removed from the spindle 1, the thread running over the cutting device 5 is cut by the cutting device 5.

Fig. 3a shows a top view of the flat cutting device 5 on the clamping ring 8. For the sake of simplicity only two of the recesses 9 of the clamping ring 8 have been provided with reference numerals. The diameter of the cutting area of the cutting device 5, which is designed flat, is smaller than the outer diameter of the clamping ring 8, which is advantageous for the operator for safety reasons. The cut-off region 10 is a sharp edge or the like that forms a cutting edge at the circumference. However, the cutting device 5 protrudes beyond the recess in the clamping ring 8, so that the wire located in the recess 9 can be cut.

Fig. 3b shows a top view of the cutting device 5. The cut-out region 10 is here sharpened to allow better separation of the wires. The recess 11, which is here bounded by the inner region 12 of the severing drum 5, is arranged here in the form of a circle having a diameter which is slightly smaller than the diameter of the shaft at its lower end. In this case, the inner region 12 is equal to the clamping region 13. When the cutting device 5 is pushed onto the shaft, the cutting device 5 is slightly bent open due to the groove 14 in the cutting device 5 and thereby clamps the cutting device 5 firmly on the shaft.

Fig. 4a shows a top view of another embodiment of the cutting device 15. In the following description of this embodiment, the same reference numerals are used for the same and/or at least comparable features in their design and/or functioning mechanism as compared to the first embodiment shown in fig. 3 b. The embodiments and/or the mechanism of action thereof correspond to the design and mechanism of action of the features already described above, if these are not explained in detail again.

Compared to the cutting device from fig. 3b, this cutting device 15 differs in the design of the cutting area 16. Here, a plurality of sharpened points 17 are provided, which can reliably cut the thread.

Furthermore, the slot 18 has two corners 19. If the thread is pulled into the slot, the thread remains captured in the corner 19 and is effectively prevented from advancing as far as the spindle's axis.

Fig. 4b shows a top view of another embodiment of the cutting device 20. In the following description of this embodiment, the same reference numerals are used for the same or at least comparable features in their design compared to the first embodiment shown in fig. 3 b. Since these are not explained in detail again, their design and/or mechanism of action correspond to the design and mechanism of action of the features already described above.

In this embodiment, a sharpened protrusion 22 on the side 23 is provided for cutting off the area 21. This projection 22 is particularly suitable for cutting the thread when the spindle is rotated again shortly after the cop has been lifted slightly from the spindle. The wire is then pulled by the sharpened side 23 and cut.

Furthermore, the cutting device 20 has a specially designed inner region 24 with three separate clamping regions. The clamping with these three clamping areas 25 is very effective and the creation of grooves can be avoided.

The present invention is not limited to the embodiments shown and described herein. Modifications are also possible within the scope of the application, such as combinations of features, although these are shown and described in different embodiments.

List of reference numerals

1 spindle

2 axle

3 cop

4 clamping crown

5 cutting device

6 clamping sleeve

7 lower winding area

8 clamping ring

9 notches

10 cutting area

11 recess

12 inner region

13 clamping area

14 groove

15 cutting device

16 cutting area

17 tip

18 groove

19 corner

20 cutting device

21 cutting area

22 projection

23 side of the

24 inner region

25 clamping area

Claims

1. A spindle (1) for a workstation on a textile machine,

having a shaft (2) for receiving a tube, the shaft being wound with a wire to form a cop;

An ingot bottom adjacent to said shaft (2); and

-a cutting device (5, 15, 20) arranged above the spindle bottom for cutting the thread when removing the cop (3) from the shaft (2);

wherein the cutting device (5, 15, 20) has a recess (11) for closing the shaft (2), an inner region (12, 24) adjacent to the recess (11) and a cutting region (10, 16, 21); and is provided with

The cutting device rests on the ingot bottom without being connected to the ingot bottom,

characterized in that the inner region (12, 24) of the cutting device (5, 15, 20) has at least one clamping region (13, 25) for firmly clamping the cutting device (5, 15, 20) on the shaft (2) when the cutting device (5, 15, 20) is pushed onto the shaft, the at least one clamping region (13, 25) being circular and the diameter of the circular clamping region (13) being smaller than or equal to the diameter of the lower end of the shaft (2).

2. Spindle (1) according to claim 1, characterized in that said textile machine is a ring spinning machine.

3. Spindle (1) according to any one of the previous claims, characterized in that said diameter of the circle described in said at least one clamping area (13, 25) is less than or equal to said diameter of said lower end of said shaft (2).

4. Spindle (1) according to claim 1 or 2, characterized in that said cutting means (5, 15, 20) have a groove (14, 18) with one end located at said recess (11).

5. Spindle (1) according to claim 4, characterized in that said grooves (14, 18) have at least one corner (19).

6. Spindle (1) according to claim 1 or 2, characterized in that said severing device (20) has an internal zone (24) with three separate gripping zones (25).

7. Spindle (1) according to claim 1 or 2, characterized in that said cutting device (20) is designed flat.

8. Spindle (1) according to claim 1 or 2, characterized in that said cutting areas (10, 16, 21) have rounded edges, cusps (17) and/or projections (22) which are at least partially sharp.

9. Spindle (1) according to claim 1 or 2, characterized in that said severing device (5, 15, 20) is designed in a single piece and is made of metal.

10. Spindle (1) according to claim 1 or 2, characterized in that the outer diameter of said cutting area (10, 16, 21) is less than or equal to the diameter of said bottom.

11. Spindle (1) according to claim 1 or 2, characterized in that said bottom has a notch (9) and in that the external diameter of said severing zone (10, 16, 21) is greater than or equal to the internal diameter formed by the base of said notch (9).

12. Spindle (1) according to claim 1 or 2, characterized in that said spindle bottom is a clamping crown (4).

13. A cutting device (5, 15, 20) for cutting a thread when removing a cop (3) from a shaft of a spindle (1) according to any of claims 1 to 12, wherein the cutting device (5, 15, 20) has a recess (11) for closing the shaft (2), an inner region (12, 24) adjacent to the recess (11) and a cutting region (10, 16, 21),

characterized in that the cutting device (20) is designed flat and the inner region (12, 24) has at least one clamping region (13, 25) for firmly clamping the cutting device (5, 15, 20) on the shaft (2) when the cutting device (5, 15, 20) is pushed onto the shaft.

14. Cutting device (5, 15, 20) according to claim 13, characterized in that the at least one clamping area (13, 25) is circular.

15. Cutting device (5, 15, 20) according to claim 13 or 14, characterized in that the cutting device (5, 15, 20) has a groove (14, 18), one end of which is arranged on the recess (11).

16. Cutting device (5, 15, 20) according to claim 13 or 14, characterized in that the cutting device (5, 15, 20) has a groove (14, 18), which groove (14, 18) has at least one corner (19).

17. Cutting device (5, 15, 20) according to claim 13 or 14, characterized in that the cutting device (20) has an inner area (24) with three separate clamping areas (25).

18. Cutting device (5, 15, 20) according to claim 13 or 14, characterized in that the cutting area (10, 16, 21) has rounded edges, a pointed tip (17) and/or a protrusion (22), which are at least partially sharp.

19. The cut-off device according to claim 13 or 14, characterized in that the cut-off device (5, 15, 20) is designed as one piece, made of metal and/or manufactured by stamping.

20. Ring spinning machine with a plurality of work stations, wherein each work station has a spindle (1) with a cutting device (5, 15, 20) for cutting the thread when removing a cop (3) from the spindle (1), characterized in that the spindle (1) is designed as a spindle (1) according to any one of claims 1 to 12.