WO2008014805A1

WO2008014805A1 - Yarn delivery device having a removable yarn delivery drum

Info

Publication number: WO2008014805A1
Application number: PCT/EP2006/007634
Authority: WO
Inventors: Richard Kaufmann; Michael Mixner; Markus Hermann
Original assignee: Memminger-Iro Gmbh
Priority date: 2006-08-02
Filing date: 2006-08-02
Publication date: 2008-02-07
Also published as: EP2047018A1; CN101501260A; TWI348507B; EP2047018B1; CN101501260B; TW200809027A

Abstract

A yarn delivery device according to the invention has a rotatably mounted shaft with a yarn delivery wheel which is mounted removably. A fastening element in the form of a nut or a screw, which are provided in each case with a handle, serves to fasten the yarn delivery wheel. As a result, the yarn delivery wheel can be exchanged by hand without the aid of a tool. As an alternative or in addition, the attachment of a tool is advantageously possible. A bearing face, which points in the axial direction, of an abutment preferably serves to adjust the yarn delivery wheel in a wobble-free manner. The radial orientation, the axial orientation and the wobble-free axial orientation are brought about by different functional faces, namely the flat face (30) and the cylindrical outer circumferential face of the shaft (7).

Description

Yarn feeding device with removable thread supply drum

The invention relates to a yarn feeding device, in particular a positive feed.

Yarn feeding devices are basically known devices that are used in large numbers on textile machines, for example on circular knitting machines. They serve to control the individual knitting points supplied thread. For example, EP 0 333 482 A1 discloses a yarn feeding device with a carrier, which is set up for attachment to a textile machine. He points to a corresponding mouth with a clamping screw. On the carrier, a shaft is rotatably mounted in a vertical orientation. This shaft has several pulleys over which it is driven.

At its lower end, the shaft carries a thread feed rad, which is wrapped at least once by the thread, which is thereby promoted upon rotation of the yarn feed wheel.

The yarn feed wheel is attached to the lower end of the shaft by means of a washer and a nut which is screwed onto a threaded stub provided on the shaft. A change of Fadenlieferrads is not provided.

From US-PS 4 092 006 a memory tour guide with a yarn storage drum is known, which is held on a rotatably mounted shaft. To connect the shaft is provided with a threaded hole into which a countersunk machine screw is screwed. This holds by means of a washer, the hub of the yarn feed wheel and clamps it axially against an abutment which is provided on the shaft.

In an alternative embodiment, the shaft in place of the threaded bore on an axially from the lower front end projecting threaded stub on which a machine screw sits, which holds the thread storage drum. A change of the same is not provided.

On this basis, it is an object of the invention to provide a yarn feeding device that can be easily adapted to different yarn qualities.

This object is achieved with the yarn feeding device according to claim 1:

The yarn feeding device according to the invention has a yarn feed wheel, which by means of a manually operated Fastening element with the rotatably mounted shaft is to be connected. The manually operable fastener is a screw or nut that engages an internal or external thread of the shaft. It is provided with a handle that allows a tool-free operation, ie a tool-free tightening and loosening the fastening screw or nut. This regardless of the possibility to rotate the drive shaft of the yarn feed wheel both clockwise and counterclockwise.

In a preferred embodiment, the fastener is used for frictionally coupling the Fadenlieferrads with the shaft. A positive connection between the shaft and the yarn feed wheel is preferably not provided. This facilitates the attachment of the Fadenlieferrads to the shaft, because there are no special rotational positions must be set to connect shaft and Fadenlieferrad together. If so desired, however, an additional form-fit can be provided to ensure a rotationally fixed coupling between the shaft and yarn feed even when not quite tightened mounting screw or nut.

The provided on the fastening screw or nut handle can be, for example, a molded plastic part. Preferably, this is relatively flat, so that it does not or only slightly beyond the lower edge of the yarn feed wheel. Thus, and by avoiding radially oriented surfaces on the handle, the generation of unwanted air currents with rotating Fadenlieferrad, which could also lead to the deposition of Flus on the handle, avoid. Preferably, the fastening element is provided in addition to the handle with a coupling for connecting a tool. This coupling may for example be an opening with hexagonal cross-section, a screwdriver slot or a screwdriver cross slot or the like. This tool attachment opening can be used as an assembly aid in serial industrial production or even if the fastening screw or nut is so tight that it can not be loosened by hand.

If yarn feeding wheels are to be screwed on and off by hand, care must nevertheless be taken to ensure that the yarn feed wheel concentricity is achieved even in the case of unskilled handling. Here, the requirements are considerable. Yarn delivery quantity fluctuations as a result of non-rotating yarn feed wheels are intolerable.

An advantageous embodiment of the invention addresses this problem by the RadialJustierung and the axial adjustment of the yarn feed wheel are provided by different functional elements. Preferably, the yarn feed wheel is provided on its serving for receiving the shaft opening with an edge or collar, which rests flat against the shaft and thereby serves for the correct radial alignment of the yarn feed wheel. A certain game is present and tolerable. It enables the easy insertion and removal of the yarn feed wheel. To eliminate any wobble, however, serves an interrupted or contiguous trained annular surface on which the yarn feeding wheel finds its axial abutment. The fastening screw or nut biases the yarn feed wheel against this annular surface. This will cause positioning errors in Result of manufacturing tolerances on the collar of the opening of the yarn feed wheel and assembly tolerances and errors eliminated. It is ensured that the yarn feed wheel runs without tumbling even after many changes and despite certain production tolerances. The yarn feed wheel can be formed as a sheet metal bent part.

Preferably, the fastening element is designed as a fastening screw. This again in turn agrees with the fastening screw with which the yarn feeding device is to be attached to the textile machine. The fastening screw is preferably provided on its front side with a ring cutting edge. As a result, the yarn feeding device can be securely and permanently attached to the textile machine with manual force on the fastening screw. The annular cutting edge makes it possible to penetrate paint layers present on the machine ring and thus establishes electrical contact between the holder and the machine ring. In addition, it centered ring cutter the mounting screw, where she worked less deep into the machine ring as an alternative possible tip.

Further details of advantageous embodiments of the invention are the subject of subclaims, the drawings or the description. In the drawings, embodiments of the invention are illustrated. Show it:

FIG. 1 shows a diagrammatic, simplified side view of a yarn feeding device according to the invention,

Figure 2 shows the yarn feeding device of Figure 1 in a fragmentary perspective view with Look at the underside of the thread delivery wheel,

3 shows the shaft-hub connection of the yarn feed wheel according to FIGS. 1 and 2 in a vertically sectioned illustration,

FIG. 4 shows the fastening element according to FIG. 3 in a plan view and

Figure 5 shows a modified embodiment of the shaft-hub Verbmdung the Fadenlieferrads in a vertically sectioned view.

Figure 1 illustrates a yarn feeding device 1, which serves to supply a textile machine with thread. If the textile machine is, for example, a circular knitting machine, then this is provided with a holder, a so-called machine ring 2, on which many such yarn feeding devices 1 sit and in each case supply thread to the knitting points. The delivery is positive, i. essentially slip-free. That The individual knitting points are fed defined amounts of thread.

For this purpose, the yarn feeding device 1 on a support 3, which is connected via a suitable fastening means 4 with the machine ring 2. The fastening device 4 is formed for example by a mouth-like recess in the carrier 3, which is associated with a fastening screw 5. For easier operation, it is provided with a handle 6. This can be formed for example by a molded plastic part.

The yarn feeding device 1 has a shaft 7 rotatably mounted on the carrier 3, which carries at its upper end o- above the carrier 3 at least one pulley 8, which serves for the rotational driving of the shaft 7. Alternatively, a plurality of such pulleys 8 may be provided, each of which may engage different belts.

Below the carrier 3, the shaft 7 is connected to a yarn feed wheel 9, which serves to convey the yarn 10. This passes through a plurality of eyelets 11, 12, 13 and a thread brake 14, which is arranged with respect to the direction of the thread 10 before the yarn feed wheel 9 and formed, for example, by magnetic force adhering rings i st.

The yarn feed wheel 9 is preferably a bent sheet metal part or deep drawn part. As shown in FIG. 2, it has a lower end wall 15, over which an edge 16 projects downwards. In this case, "downward" means in the direction of the shaft 7, extending beyond the free end thereof, but it is also possible to use thread supply wheels which are designed as a rod cage, which can be rigidly formed As described in DE 31 05 990 A1, the yarn feed wheel is then formed by two pin drums which are pushed into one another and whose axes of rotation are inclined by a few degrees, one pin drum being fastened to the shaft, while the other pin drum is attached to the drum An angular ball bearing is mounted on the carrier 3. The relative movement between the two synchronously rotating pin drums causes the feeding of a thread winding which wraps around the pin drums.

Above the edge 16 is a suitably profiled storage section 17 and above which an inlet region 18 is provided, which tapers conically. The yarn feed wheel 9 may alternatively be formed as a rod cage or otherwise.

For fastening the yarn feed wheel 9 on the shaft 7 is a fastener 18, for example in the form of a provided with a handle 19 screw 20, as can be seen from Figure 3. The screw 20 is screwed in this embodiment in a coaxial in the shaft 7 threaded bore 21 having an internal thread 22. The screw 20 is connected to a corresponding outer ßengewinde 23 provided that fits the internal thread 22. The internal thread 22 is preferably set back against the end face of the shaft 7, so that the external thread 23 and the internal thread 22 engage only a few (for example less than 10, preferably less than 5) revolutions. This allows the yarn feed wheel with a few simple steps to solve and fasten. In addition, the then relatively short internal thread 22 can be made easier.

The screw 20 is overmolded on its head 24 with an artificial material body 25 which forms the handle 19. As illustrated in FIG. 4, the handle is square, for example, in plan view, wherein grip recesses 26, 27 are formed at its edges. These are so flat that at any point parallel to the radial direction R standing surfaces are formed. In addition, as illustrated in FIG. 2, the handle 19 is preferably so flat that it does not project beyond the lower edge 16. However, it can also, as Figure 1 illustrates, slightly above the edge 16 protrude down.

The head 24 is also provided with a lug opening 28 for non-rotatably attaching a tool, for example a hexagon socket, to the screw 20. At the opposite end, an annular cutting edge 28 is formed on the end face of the threaded shaft of the screw 20, which is oriented concentrically to the longitudinal center axis of the screw 20.

The shaft 7 is cylindrical on its outer periphery, in particular in the lower end region. In addition, sitting on the shaft 7, a sleeve 29 which forms an abutment for the end wall 15 of the yarn feed wheel 9. The sleeve 29 is axially immovably connected to the shaft 7. It has on its front side a flat annular plane surface 30, which serves for the wobble-free orientation of the yarn feed wheel 9. In addition, the sleeve 29 defines with the outer surface of the shaft 7 an annular space 31 which serves to receive a formed on the end wall 19 pipe flange 32 of the yarn feed wheel 9. The pipe flange defines an approximately cylindrical opening whose axial length is greater than the thickness of the existing sheet metal end wall 15. In the radial direction of the pipe flange 32 has little play on the shaft 7, which is in the range of hundredths or tenths of a millimeter.

Between the screw 20 and the end wall 15, a washer 33 is provided. The end wall is clamped between the washer 33 and the plane surface 30.

In operation, a not further illustrated timing belt rotates the pulley 8 and with this the yarn feed wheel 10 right or left. The thread spool 9 looping around the thread is thereby fed to the knitting machine or other textile machine. The handle 19 is largely covered by the edge 16. The handle generates only a small air movement and does not act as a fan blade. Thus, flow deposits are minimized.

If the yarn feed wheel to be changed or cleaned, it can be solved by the shaft 7. For this purpose, the fastener 18 is released without the aid of a tool by the pulley 8 or the yarn feed wheel 18 is held and rotated with the other hand, the handle 19. If the screw is screwed out of the threaded hole 21, the Fadenlieferrad can be changed and the Tighten screw 20 again. In this case, the pipe flange 32 of the other yarn feed wheel is again introduced into the annular space 31 and the screw 20 tightened. It presses on the washer 33, the wall 15 to the flat surface 30 and thereby aligns the yarn feed wheel 9 free of tumble.

The screw 20 can be exchangeable with the fastening screw 5 match. This signals to the operator, even if he does not know the yarn feeding device, that the fastening element 18 is a manually releasable element. The two fastening screws 5, 20 can be replaced with each other. At the same time, the functionless blade 28 gains its function. If the screw 20 is used as a fastening screw 5, it secures the yarn feeding device 1 thanks to the action of the cutting edge 28 on the machine ring 2 long-term secure. In addition, an electrical connection between the machine ring 2 and the carrier 3 is produced. Length and thread of the screw 20 are at least in an advantageous embodiment dimensioned so that the screw 20 can serve as a fastening screw 5.

A modified embodiment is illustrated in FIG. 5. For this purpose, unless otherwise explained below, the previous reference symbols and descriptions apply correspondingly.

The shaft 7 is provided with a projection 34 which carries external thread 35. In place of the head 24, a nut 36, which is encapsulated by the plastic body 25 occurs. As in the previous embodiment, there is a cohesive connection between the plastic body 25 and the fastening element, ie here the nut 36. The possibility to use a tool was omitted here.

In a modified embodiment, the nut 36 is held positively in the plastic body 25. The positive connection can be supported by a frictional connection, so that the plastic body 25 can be pulled off the nut 36. In this case, then a tool can be attached to the nut 36. For example, the nut 36 may be a hex nut. The frictional engagement between the nut 36 and the plastic body 25 is preferably so strong that the plastic body 25 from the nut 36 can not fall unintentionally. The frictional engagement can be supported by a latching connection.

An inventive yarn feeding device has a rotatably mounted shaft with a Fadenlieferrad which is removably mounted. To fasten the Fadenlieferrads serves a fastener in the form of a nut or a screw, which are each provided with a handle. As a result, the yarn feed wheel can be replaced by hand without the aid of tools. Advantageously, alternatively or additionally, the approach of a tool is possible. For the wobble-free adjustment of the yarn feed wheel is preferably a looking in the axial direction contact surface of an abutment. Radial alignment and axial alignment and tumble-free axial alignment are provided by different functional surfaces, namely the flat surface 30 and cylindrical outer peripheral surface of the shaft 7. Numeral 1 iste

1 thread delivery device

2 machine ring

3 carriers

4 fastening device

5 fixing screw

6 handle

7 while

8 pulley

9 thread feed wheel

10 threads

11 eyelet

12 eyelet

13 eyelet

14 Thread brake

15 front wall

16 edge

17 Speieherabschnitt

18 fastener

19 handle

20 screw

21 tapped hole

22 internal thread

23 Thread 4 Head 5 Plastic body 6 Grip 7 Grip 8 Blade 9 Sleeve

30 plane surface

31 room Pipe Flange Washer Extension Male Thread Nut

Claims

Claims:

1. Yarn feeding device (1)

with a carrier (3) which is set up for attachment to a textile machine,

with a rotatably mounted shaft (7) which is provided at one end with a thread (22),

with drive means (8) for rotationally driving the shaft (7),

a Fadenlieferrad (9) having an opening for centering the end of the shaft (7) is provided, and

with a fastening element (20) which has a thread (23) matching the thread (22) of the shaft (7) and is screwed to it, the fastening element (20) being:

a handle (19) which allows a tool-free tightening and loosening of the fastener (20).

2. Yarn feeding device according to claim 1, characterized in that the drive device (8) for right and left rotation of the shaft (7) is arranged.

3. Yarn feeding device according to claim 1, characterized in that the drive device (8) by at least one with the shaft (7) rotatably connected or connectable pulley (8) is formed.

4. Yarn feeding device according to claim 1, characterized in that on the shaft (7) an abutment (29) for a- xialen support of the yarn feed wheel (9) is provided.

5. Yarn feeding device according to claim 4, characterized in that the abutment (29) has an axially facing annular support surface (30).

6. Yarn feeding device according to claim 1, characterized in that at least the central, the opening having portion of the yarn feed wheel (9) is formed of a metal sheet.

7. Yarn feeding device according to claim 6, characterized in that the opening has a rim (32) defining a cylindrical passage whose axial length is greater than the thickness of the sheet from which the section consists.

8. Yarn feeding device according to claim 4 and 7, characterized in that between the abutment (29) and the shaft (7), an annular space (31) is provided for receiving the edge.

9. Yarn feeding device according to claim 1, characterized in that the edge (32) bears with its cylindrical inner wall play without play on the outside of the shaft (7).

10. Yarn feeding device according to claim 1, characterized in that the fastening element is a nut (36).

11. Yarn feeding device according to claim 1, characterized in that the fastening element (18) is a screw (20).

12. Yarn feeding device according to claim i, characterized in that the fastening element (20) has a coupling

(28) for a tool.

13. Yarn feeding device according to claim 12, characterized in that the coupling (28) is a hexagonal opening for receiving an Allen wrench.

14. Yarn feeding device according to claim 1, characterized in that the handle is formed by a to the fastening element (20) molded plastic part (25).

15. Yarn feeding device according to claim 1, characterized in that the handle (19) lies within a bounded by the lower edge of the yarn feed wheel (9) space.

16. Yarn feeding device according to claim 11, characterized in that the fastening element (20) has a ring cutting edge (28) on its end.

17. Yarn feeding device according to claim 16, characterized in that the fastening element (20) is interchangeable with another fastening element (5). true, which serves to attach the carrier (3) to the textile machine.