US3920193A

US3920193A - Winding apparatus with automatic changing of tubes or the like

Info

Publication number: US3920193A
Application number: US447853A
Authority: US
Inventors: Peter Gujer; Hans Schellenberg; Olivier Wust
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 1973-12-14
Filing date: 1974-03-04
Publication date: 1975-11-18
Anticipated expiration: 1992-11-18
Also published as: DE2406550B2; BR7410407D0; DE2406550A1; JPS55115559A; NL7413756A; CH574866A5; ES432910A1; FR2254504A1; JPS5738504B2; GB1488126A; AT347825B; DD116025A5; IT1023120B; FR2254504B1; AU7621674A; DE2406550C3; ATA968974A; AR207579A1

Abstract

A winding device for automatically changing tubes for taking-up endless threads or the like, comprising a thread traversing device for generating thread winding wraps, a thread deflecting device for lifting the thread off the thread traversing device and a thread holding device provided with a thread guiding device for guiding the thread in its lifted-off position during change of the bobbin tube. At least two driven bobbin chucks are capable of being alternately brought into a bobbin- or tube change position respectively, each chuck being capable of taking-up or supporting one tube. A thread catching and cutting zone is arranged adjacent to one end of the tube and rotates together with the tube. The thread holding device is arranged in such a manner that the thread lifted off the thread traversing device is guided thereby at the immediate vicinity of the thread catching and cutting zone. According to the invention, a thread shifting device is provided for the purpose of shifting the thread guided by the thread holding device in a first shifting phase from its position at the immediate vicinity of the thread catching and cutting zone through such zone onto the end portion of the tube adjacent thereto, and which thread shifting device in a second phase shifts the thread over a predetermined distance on the tube creating the reserve wraps. The thread shifting device is constructed such that the thread is shifted at higher shifting speed in the second phase than in the first phase.

Description

United States Patent [191 Gujer et a1.

[ WINDING APPARATUS WITH AUTOMATIC CHANGING OF TUBES OR THE LIKE [75] Inventors: Peter Gujer, Effretikon; Hans Schellenberg, Winterthur; Olivier Wiist, Seuzach, all of Switzerland [73] Assignee: Rieter Machine Works Ltd.,

Winterthur, Switzerland [22] Filed: Mar. 4, 1974 {211 App]. No.: 447,853

[30] Foreign Application Priority Data Dec. 14, 1973 Switzerland 17526/73 [52} US. Cl. 242/18 A; 242/18 PW [51] Int. Cl. B65H 67/04; B65H 54/34 [58] Field of Search 242/18 A, 18 PW, 18 DD [56] References Cited UNITED STATES PATENTS 2,391,472 12/1945 Morton 242/18 PW UX 3,408,011 10/1968 Lenk et a1 242/18 PW 3,819,123 6/1974 Luz 242/18 PW FOREIGN PATENTS OR APPLICATIONS 2,048,416 4/1971 Germany 242/18 A Primary ExaminerStai11ey N. Gilreath Attorney, Agent, or Firm-Werner W. Kleeman Nov. 18, 1975 [57] ABSTRACT A winding device for automatically changing tubes for taking-up endless threads or the like, comprising a thread traversing device for generating thread winding wraps, a thread deflecting device for lifting the thread off the thread traversing device and a thread holding device provided with a thread guiding device for guiding the thread in its lifted-off position during change of the bobbin tube. At least two driven bobbin chucks are capable of being alternately brought into a bobbinor tube change position respectively, each chuck being capable of taking-up or supporting one tube. A thread catching and cutting zone is arranged adjacent to one end of the tube and rotates together with the tube. The thread holding device is arranged in such a manner that the thread lifted off the thread traversing device is guided thereby at the immediate vicinity of the thread catching and cutting zone. According to the invention, a thread shifting device is provided for the purpose of shifting the thread guided by the thread holding device in a first shifting phase from its position at the immediate vicinity of the thread catching and cutting zone through such zone onto the end portion of the tube adjacent thereto, and which thread shifting device in a second phase shifts the thread over a predetermined distance on the tube creating the reserve wraps. The thread shifting device is constructed such that the thread is shifted at higher shifting speed in the second phase than in the first phase.

7 Claims, 17 Drawing Figures U.S. Patent Nov. 18, 1975 Sheet 2 0% 3,920,193

US. Patent Nov. 18, 1975 Sheet 3 0f6 3,920,193

fllllfll Nov. 18, 1975 Sheet 4 of6 3,920,193

U.S. Patent US. Patent Nov. 18, 1975 Sheet 5 of6 3,920,193

w 1 a m! l! U.S. Patent Nov. 18, 1975 Shcel 6 of6 3,920,193

WINDING APPARATUS WITH AUTOMATIC CHANGING OF TUBES OR THE LIKE BACKGROUND OF THE INVENTION The present invention relates to a new and improved construction of winding device for automatically changing tubes for taking-up endless threads or the like.

Devices of this type are suitably employed in spindrawwinding processes in the man-made fiber producing industry.

There are already known to the art winding devices for automatically changing bobbin tubes wherein for the thread transfer from the full bobbin to the empty tube the thread or the like is lifted-offa thread traversing device, guided into a position where the thread is caught by a thread catching and cutting zone, the thread is then severed and subsequently, after placement of a number of reserve wraps onto the empty tube, the thread is again entrained by the thread traversing device. With this prior art equipment the thread catching and cutting zone rotates in conjunction with the bobbin chuck supporting the tube and is shifted in axial direction together with the bobbin chuck into the zone of the thread which has been lifted off the thread traversing device and guided into the above-described position. In this arrangement the reserve wraps are formed by axially shifting back the bobbin chuck and which is required for bringing the tube into the effective range or zone of the thread traversing device. a device of this type has been described and shown in Swiss patent 513,763, to which reference may be readily had.

A disadvantage of this prior art winding device resides in the fact that the formation of the reserve windings, i.e. their helix angle cannot be changed, so that the formation of the reserve windings is governed solely by the speed of the axial shifting movement of the bobbin chuck and by the winding speed. On the one hand, owing to the high winding speeds, reaching 3000 meters per minute or more which can be attained at such winding devices, and, on the other hand, due to the prevailing axial shifting speed of the bobbin chuck which is limited by the inertia or mass of the bobbin chuck, there are formed relatively low helix angles of the thread reserve windings. Low helix angles, however, constitute a drawback insofar as the thread is spread or fanned when the operator pulls off the reserve wraps for knotting the inner thread end formed by the reserve wraps to the outer thread end of the next full bobbin which is to be subsequently processed, the thread being spread or fanned at the location where the reserve wraps are covered by the normal winding wraps in such a manner that individual filaments as will be described more fully hereinafter are torn, resulting in an undesired weakening of the thread at this location.

SUMMARY OF THE INVENTION Hence, it is a primary object of the present invention to provide an improved winding apparatus which is not associated with the aforementioned drawbacks and limitations of the prior art proposals and effectively and .reliably fulfills the need still existing in this art.

2 angle in order to extensively avoid the aforementioned spreading of fanning of the thread.

A further object ofthis invention aims at building-up the thread reserve in stages or steps, that is to say, to avoid maintaining constant the displacement speed of the thread in axial direction of the bobbin chuck over the entire length between the thread catching and traversing zone.

Now in order to implement these and still further objects of the invention, which will become more readily apparent as the description proceeds, the winding device of this development for automatically changing tubes for taking up endless threads or the like, comprises a thread traversing device for generating the thread winding wraps, a thread deflecting device for lifting the thread off the thread traversing device, and a thread holding device provided with a thread guiding device for guiding the thread in its lifted-off position during change of the bobbin tubes. Further. there are provided at least two driven bobbin chucks which alternately can be brought into a bobbin or tube change position, each of the bobbin chucks holding or accommodating one tube. A thread catching and cutting zone is arranged adjacent to one end of the tube and rotates together with the tube. The thread holding device is arranged in such a way that the thread which is lifted off the thread traversing device is guided thereby at or in the immediate vicinity of the thread catching and cutting zone. The invention contemplates the provision of a thread shifting device which serves to shift the thread guided by the thread holding device in a first shifting phase from its position at the immediate vicinity ofthis thread catching and cutting zone through such zone onto the end portion of the tube adjacent thereto, and which thread shifting device in a second phase shifts the thread over a predetermined distance on the tube creating the reserve wraps, and the thread shifting device is constructed such that the thread is shifted at a higher shifting speed in the second phase than in the first phase.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:

FIG. I is an elevational view of a winding device designed according to the teachings of the invention, wherein the bobbin chucks are shown in solid lines in their winding position, i.e. following the bobbin change and are shown in phantom lines in the bobbin change position immediately prior to the thread transfer;

FIG. 2 is a top plan view of the winding device depicted in FIG. 1, showing the bobbin chuck in the winding position according to FIG. 1;

FIG. 3 is a top plan view of the winding device showing the bobbin chuck in the bobbin change position of FIG. 1 immediately prior to the thread transfer operatlon;

FIGS. 4, 5, 6 and 7 each schematically depict details of the thread holding device and a portion of the bobbin chuck with the thread catching and cutting zone, the tube being shown placed upon the bobbin chuck, and the various Figures portraying different phases of the bobbin change process or operation;

FIGS. 8, 9, l0 and I1 schematically illustrate a variant embodiment of the thread holding device, the bobbin chuck being depleted in the manner as shown in FIGS. 4 to 7 in various phases of the bobbin change operation;

FIG. 12 illustrates on an enlarged scale a detail of the modified embodiment depicted in FIGS. 8ll;

FIG. I20 is a plan view of the detailed showing of FIG. 12;

FIGS. 13 and 14 respectively schematically illustrate two different types of thread reserve wraps;

FIG. IS illustrates thread reserve wraps possessing a low helix angle; and

FIG. 16 illustrates thread reserve wraps possessing an enlarged helix angle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Describing now the drawings. there is shown in FIGS. 1 to 3 a winding device or winder l for automatically changing bobbin tubes. this winding device embodying a rotatably supported bobbin arm 2 which can be rotated in counterclockwise direction. A

respective bobbin chuck

3 and 3' is arranged at the rotatably supported bobbin arm 2, each

such chuck

3 and 3' serving to takeup or receive a tube 4 and 4' respectively. A friction drive drum 5 selectively drives the bobbin chucks 3 and 3' respectively while a thread 7. which is traversed to-and-fro by a traversing thread guide 6, is transferred onto a given one of the tubes 4 or 4' which is in the winding position for the purpose of building-up the bobbin windings in a manner well known in this particular art. A thread deflecting device 8 is provided at the immediate vicinity of the thread 7 or the like at a location above the traversing thread guide 6. This thread deflecting device 8 comprises a cylinder 9 within which there is mounted for reciprocal motion a piston. which has not been particularly referenced. and which is equipped with a piston rod 10 at which there is mounted a deflecting bar 11. At the side opposite the thread 7, as viewed from the deflecting bar ll, there is arranged a thread holding device 12. In the exemplary embodiment under consideration, this thread holding device I2 comprises a piston and cylinder unit 14 (FIGS. 27) mounted at a frame 13 (FIGS. 1-11) of the winding device, and at the piston rod 15 of such piston and cylinder unit 14, as best seen by referring to FIGS. 2 and 3, there is connected a rod 16 (FIGS. 1-11). This rod 16 is provided with a thread guide notch 17 at the effective zone or region G of the thread traversing arrangement. as best seen by referring to FIG. 2.

During the bobbin change operation. the

empty tube

4 or 4 respectively, as the case may be. is initially brought into the position indicated in FIG. 1 with phantom lines and depicted in FIG. 3, i.e. into a position where. on the one hand, the thread is still connected with a full bobbin 18, here shown supported on the bobbin chuck 3'. and which bobbin [8 has been lifted off the friction drive drum 5 but is still rotating owing to the inertia of the rotating mass, and in which position. on the other hand. the thread however is already guided on a thread guiding surface (FIGS. 2-4 and FIG. 8) of the bobbin chuck which has been axially shifted in the direction ofthe arrow A (FIG. 3) into the position shown in FIGS. 3-6 and 8-10. The thread guiding surface 20 which rotates together with the associated bobbin chuck, in this case the bobbin chuck 3, is arranged adjacent to a thread catching and cutting zone 19 (FIGS. 2-4 and FIG. 8) which also rotates to- 4 gether with the bobbin chuck 3. The thread 7 or the like is brought into this position by moving the deflecting bar 11 (FIGS. I-3) forwardly into the position indicated in phantom lines in FIG. I in such a manner that the thread 7, as soon as it slides or glides into the notch I7 of the thread holding rod 16 is Iiftedoff the traversing thread guide 6 and is only guided by such notch 17.

For the purpose of shifting the thread 7 from this position. (FIGS. 2 and 4) to the thread catching and cutting zone I9 and subsequently onto the associated tube 4. there is provided a control valve 22 which is connected to a supply of a suitable source of pressurized fluid medium. here shown as a compressed air duct 21 (FIG. 4). The control valve 22 is set in such a manner that a compressed air duct 23 connecting the control valve 22 with the piston and cylinder unit 14 is supplied with compressed air. Consequently, an inner cylinder 24 which acts as a piston is thus shifted over the distance X (FIGS. 5-7) against the action of the pressure of a spring 25 and against a stop (not shown) in the direction of the arrow C (FIG. 4) essentially parallel to the axis of the bobbin chuck. Due to this axial shifting of the cylinder 24 functioning as a piston and thus the therewith connected rod I6, the thread 7, as best seen by referring to FIG. 5, is entrained by the thread catching and cutting zone 19, this thread thus being severed and subsequently transferred onto the tube 4. In this position an air entry or admission opening 26 ofthe cylinder l4 coincides with an air entry or admission opening 27 of the inner cylinder 24. Now in order to shift the thread 7 or the like further through the distance 1 on the tube 4, there is provided a control valve 29 which is connected to a compressed air duct 28. This control valve 29 is set in such a manner that a duct 30 connecting the control valve 29 with the air entry opening 26 is supplied with compressed air, the piston 31 of the cylinder 24 thus being shifted over the distance Y (FIGS. 6 and 7) against the pressure of a spring 32 in such a manner that the thread 7, as best seen by referring to FIG. 6, is wound onto the rotating tube 4 for forming reserve windings W corresponding to the path or distance Y. If simultaneous with the movement of the piston 31 over the distance Y the associated bobbin chuck. in this case the bobbin chuck 3, is moved back in the direction of the arrow B (FIG. 3) into the initial position shown in FIG. 2, then there are formed on the tube 4 reserve windings corresponding to the distance Z (FIG. 7).

Now for the purpose of moving the cylinder 24 acting as a piston and the piston 31 back again into their initial positions as shown in FIG. 4, the

control valves

29 and 22 respectively are set or switched in such a manner that the compressed air escapes through the

ducts

30 and 23 respectively into the surrounding atmosphere. Furthermore, an opening or port 33 is provided at the cylinder 14 and an opening or port 34 is provided at the cylinder 24 in such a manner that the air displaced during the forward movement and the air which is suckedup during the return or backward movement can escape into or can enter from the surrounding atmosphere. as the case may be.

The components for supplying the compressed air and the pressure of the compressed air are laid out or designed such that the distance Y is covered at a greater speed than the distance X.

Continuing, it is to be observed that FIGS. 8-11 and FIGS. 12 and 12a illustrate a variant embodiment of a stepwise thread shifting process. A piston and cylinder unit 35 mounted on frame 13 is provided with a piston rod 35a connected with the rod 16 equipped with thread guide notch 17. The piston rod 35a and the therewith connected rod 16 are movable in the direction of the arrow C essentially parallel to the lengthwise axis of the bobbin chuck. A triangular thread guide plate 36, as best seen by referring to FIGS. 9, 12, and 12a, is mounted via a support 37 on the movable rod 16 at a location between the thread guide notch 17 and the piston and cylinder unit 35 and therefore is also arranged to be movable in the direction of the arrow C. A substantially trapezoidal-shaped thread guide plate 38, as best seen by referring to FIGS. 8, 12 and 12a, is rigidly mounted on a support member or holder 39 of a frame portion 40 which is part of the winding device 1. The first-mentioned thread guide plate 36 is arranged parallel to. but lower than, the last-mentioned thread guide plate 38, as such has been indicated in FIG. 12 by reference character N; it is to be observed that the thread guide plate 36 is arranged between the thread guide plate 38 and the tube 4. Furthermore, as best seen by referring to FIG. 12a, the thread guide plate 36 is provided with a thread guide surface 41, and the thread guide plate 38 is provided with a thread guide notch 42.

Now this thread guide notch 42 is arranged at the side of the thread guide plate 38 facing the piston and cylinder unit 35 and is formed by a surface 43 and a surface 44. The surface 43 forms together with a plane E which is parallel to rod 16 and perpendicular to the thread guide plate 36 and the thread guide plate 38 respectively, an angle a of somewhat less than 90. This angle however, also can be selected so as to lie in a range of about 60 to 120, whereas the thread guide surface 41 forms an angle )3 of about 30 with the plane E. The angle [3 can be selected to be in the range of up to about 60. The thread guide surface 41 exceeds the surface 43 in the direction towards the plane E by a distance M, as best seen by referring to FIG. 12a. The notch angle 7 amounts to about 175, but it can be reduced to about 90 if needed.

Now, for shifting the thread'Tfrom its initial position previously described and shown in FIG. 4, where the thread 7 contacts the thread guiding surface 20, into the thread catching and cutting zone 19 and subsequently onto the associated tube 4, there is provided a control valve 47. As best seen by referring to FIG. 8, this control valve 47 is connected with a compressed air duct 46 and is set or switched in such a manner that a duct or conduit 48 which connects the control valve 47 with the end of the piston and cylinder unit 35 facing the frame 13 is supplied with compressed air. Further, a control valve 47' connected by a duct or conduit 48' with the upper end of the piston and cylinder unit 35 is set or switched in such a manner that the air displaced in the direction of the arrow C by the movement of the piston 35' of the piston and cylinder unit 35 can escape into the atmosphere. After the thread in conjunction with the rod 16 has been shifted over the distance X, as best seen by referring to FIGS. 8, 10 or 11, this thread 7, on the one hand, is placed onto the tube 4 and, on the other hand, into the guide notch 42 of the thread guide plate 38 (FIG. 12a). As the rod 16 is shifted further in the direction of the arrow C, the thread 7, which is still guided in the thread guide notch 17, is shifted by the thread guide surface 41, which necessarily also moves in the direction of the arrow C out ofthe thread guide notch 42 (FIG. 9) and this thread 7 6 then moves along the surface 43 until it slides over the end edge 44' (FIG. 12a) ofthe surface 43. At this point in time the thread 7 suddenly jumps so as to cover the distance Y and thus forms reserve windings W of initially very steep helix angles (FIG. 10) corresponding to the length Y on the tube 4.

In order to return or reset the piston 35', the control valves 47 and 47' respectively are switched-over, ie the control valve 47 connects the piston and cylinder unit 35 with the surrounding atmosphere while the control valve 47', which is also connected with the compressed air duct 46, supplies the piston and cylinder unit 35 with compressed air or any other suitable fluid medium under pressure which is used in the system.

If the bobbin chuck 3 is retracted in the direction of the arrow B into its initial position shown in FIG. 2 at the moment when the thread 7 jumps over the end edge 44' or shortly thereafter. then it should be recognized that reserve windings W (FIG. 11) are formed on the tube 4 over a distance corresponding to the length Z (FIG. 11).

When using the equipment shown in FIGS. 4 to 7 for shifting the thread 7, there can be formed reserve windings according to the example illustrated in FIGS. 13 and 14, i.e. there can be formed reserve windings 49 without or with a thread fixation winding 50, in that for the additional formation of the winding 50 control valve 29 can be actuated first after the lapse of a certain time by a control element (not shown) which in turn is activated according to the position of the rotatable arm 2.

When using the equipment shown in FIGS. 8 to 11, the thread fixation winding 50 is automatically formed as the thread 7 is held back in the thread guide notch 42 of the thread guide plate 38.

Some of the more notable advantages of the invention can be enumerated as follows:

a. It is possible to select such a fast speed of the thread shifting operation for forming reserve windings 49 (FIGS. 13, 14 and 16) that there can be formed a steep helix angle A (FIG. 16) and thus a small thread clamping width f(FIG. 16) at the location where the reserve windings are covered by the subsequently formed windings 51. Owing to such small thread clamping widthf, as opposed to a large thread clamping width F resulting from a small helix angle 8 as shown in FIG. 15, there occurs a smaller fan-tailed spreading of the thread consisting of a plurality of individual filaments as the reserve windings are axially pulled off (as indicated in FIGS. 15 and 16 with phantom or broken lines) e.g. by an operator, so that the initially mentioned danger of tearing-off individual filaments is practically eliminated.

b. It is possible to additionally form a thread fixation winding 50 (see for instance FIG. 14) which, on the one hand, facilitates the doffing of full bobbins from the bobbin chuck and, on the other hand, prevents any damage to the otherwise more or less loosely dangling thread reserve.

While there is shown and described present preferred embodiments of the invention, it is to be distinctly understood that the invention is not limited thereto, but may be otherwise variously embodied and practiced within the scope of the following claims.

Accordingly, what is claimed is:

1. A winding device for automatically changing tubes for taking-up endless threads or the like, said winding device being provided with a thread traversing device for generating thread winding wraps, a thread deflect ing device for lifting the thread off the thread traversing device, a thread holding device provided with a thread guiding device for guiding the thread in its lifted-off position during the change of the bobbin tube, and at least two driven bobbin chucks alternately brought into a bobbin or tube change position respectively. each of said bobbin chucks supporting one tube, a thread catching and cutting zone arranged adjacent to one end of the associated tube and rotating with such tube, said thread holding device being arranged such that the thread lifted off the thread traversing device is guided thereby in the immediate vicinity of the thread catching and cutting zone, the improvement comprising the provision of thread shifting means for shifting the thread guided by the thread holding device in a first shifting phase from a position at the immediate vicinity of the thread catching and cutting zone through such zone and onto an end portion of the tube adjacent thereto. and which thread shifting means in a second phase shifts the thread over a predetermined distance on such tube for creating the reserve wraps, said thread shifting means shifting the thread at a higher shifting speed during the second phase than during the first phase.

2. The winding device as defined in claim I, said thread shifting means comprising a drive element which can be moved substantially linearly in several steps and movable in a direction essentially parallel to the lengthwise axis of the associated bobbin chuck, said drive element being connected with the thread holding device the distance covered by the thread holding device during the first step of the movement of the drive element corresponding to the first shifting phase of the shifting movement and the distance covered by the thread holding device during the second step of the movement of the drive element corresponding to the second shifting phase of the shifting movement of the thread.

3. The winding device as defined in claim 2, wherein the drive element which is moved in several steps comprises a rigidly mounted double-step pneumatic piston and cylinder means having a piston rod connected with the thread holding device.

4. The winding device as defined in claim 3, wherein said piston and cylinder means comprises an outer cylinder and an inner cylinder, said inner cylinder being movable as a piston, the stroke of which piston defined by said inner cylinder corresponds to the first shitfting phase, a piston member equipped with a piston rod, said piston member being movable within the inner cylinder, the stroke of said piston member corresponding to the second shifting phase, said piston rod of said piston member being connected with the thread holding device.

S. The winding device as defined in claim I, wherein said thread shifting means comprises a substantially linearly movable drive element movable in a direction substantially parallel to the lengthwise axis of the associated bobbin chuck, said drive element being connected with the thread holding device, a first thread guide element provided with a thread guide notch for takingup the thread after the latter has moved over a distance corresponding to the first thread shifting phase, means for rigidly mounting said first thread guide element. a second thread guide element connected with the thread holding device at a location between the drive element and the thread guiding device of the thread holding device, said second thread guide element being provided with a thread guide surface arranged at an inclination with regard to the direction of movement of the thread holding device such that said thread guide surface, during such time as the thread holding device moves over a distance corresponding to the second shifting phase, shifts the thread along a side surface of said thread guide notch of the first thread guide element and immediately prior to completion of the second shifting phase shifts the thread over an end of such side surface.

6. The winding device as defined in claim 5, wherein the rigidly mounted first thread guide element is arranged above the movably arranged second thread guide element with respect to the lengthwise axis of the associated bobbin chuck.

7. A method for transferring a textile thread which is wound-up while traversing the thread during the bobbin change operation from a full bobbin to an empty bobbin sleeve and for applying reserve windings to the empty bobbin sleeve, comprising the steps of lifting the thread during the bobbin change operation out of a thread traversing mechanism and guiding such to the direct neighborhood of a thread catchand cutting zone adjacent the empty bobbin sleeve, during a first displacement stage moving the thread from the thread catchand cutting zone to thereby separate the thread from the full bobbin and guiding the thread to the neighboring end of the empty bobbin sleeve, then further guiding the thread during a second displacement stage on the sleeve to thereby form a reserve winding, and wherein the thread in the second stage is displaced at a greater speed than in the first stage.

Claims

1. A winding device for automatically changing tubes for takingup endless threads or the like, said winding device being provided with a thread traversing device for generating thread winding wraps, a thread deflecting device for lifting the thread off the thread traversing device, a thread holding device provided with a thread guiding device for guiding the thread in its lifted-off position during the change of the bobbin tube, and at least two driven bobbin chucks alternately brought into a bobbin or tube change position respectively, each of said bobbin chucks supporting one tube, a thread catching and cutting zone arranged adjacent to one end of the associated tube and rotating with such tube, said thread holding device being arranged such that the thread lifted off the thread traversing device is guided thereby in the immediate vicinity of the thread catching and cutting zone, the improvement comprising the provision of thread Shifting means for shifting the thread guided by the thread holding device in a first shifting phase from a position at the immediate vicinity of the thread catching and cutting zone through such zone and onto an end portion of the tube adjacent thereto, and which thread shifting means in a second phase shifts the thread over a predetermined distance on such tube for creating the reserve wraps, said thread shifting means shifting the thread at a higher shifting speed during the second phase than during the first phase.

2. The winding device as defined in claim 1, said thread shifting means comprising a drive element which can be moved substantially linearly in several steps and movable in a direction essentially parallel to the lengthwise axis of the associated bobbin chuck, said drive element being connected with the thread holding device, the distance covered by the thread holding device during the first step of the movement of the drive element corresponding to the first shifting phase of the shifting movement and the distance covered by the thread holding device during the second step of the movement of the drive element corresponding to the second shifting phase of the shifting movement of the thread.

4. The winding device as defined in claim 3, wherein said piston and cylinder means comprises an outer cylinder and an inner cylinder, said inner cylinder being movable as a piston, the stroke of which piston defined by said inner cylinder corresponds to the first shitfting step, a piston member equipped with a piston rod, said piston member being movable within the inner cylinder, the stroke of said piston member corresponding to the second shifting step, said piston rod of said piston member being connected with the thread holding device.

5. The winding device as defined in claim 1, wherein said thread shifting means comprises a substantially linearly movable drive element movable in a direction substantially parallel to the lengthwise axis of the associated bobbin chuck, said drive element being connected with the thread holding device, a first thread guide element provided with a thread guide notch for takingup the thread after the latter has moved over a distance corresponding to the first thread shifting step, means for rigidly mounting said first thread guide element, a second thread guide element connected with the thread holding device at a location between the drive element and the thread guiding device of the thread holding device, said second thread guide element being provided with a thread guide surface arranged at an inclination with regard to the direction of movement of the thread holding device such that said thread guide surface, during such time as the thread holding device moves over a distance corresponding to the second shifting step, shifts the thread along a side surface of said thread guide notch of the first thread guide element and immediately prior to completion of the second shifting step shifts the thread over an end of such side surface.

7. A method for transferring a textile thread which is wound-up while traversing the thread during the bobbin change operation from a full bobbin to an empty bobbin sleeve and for applying reserve windings to the empty bobbin sleeve, comprising the steps of lifting the thread during the bobbin change operation out of a thread traversing mechanism and guiding such to the direct neighborhood of a thread catch- and cutting zone adjacent the empty bobbin sleeve, during a first displacement stage moving the thread from thE thread catch- and cutting zone to thereby separate the thread from the full bobbin and guiding the thread to the neighboring end of the empty bobbin sleeve, then further guiding the thread during a second displacement stage on the sleeve to thereby form a reserve winding, and wherein the thread in the second stage is displaced at a greater speed than in the first stage.