US3813050A

US3813050A - Apparatus for continuously winding thread onto bobbins

Info

Publication number: US3813050A
Application number: US00310223A
Authority: US
Inventors: H Landwehrkamp
Original assignee: Schubert und Salzer Maschinenfabrik AG
Current assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
Priority date: 1971-12-27
Filing date: 1972-11-29
Publication date: 1974-05-28
Anticipated expiration: 1991-05-28
Also published as: BR7209062D0; SU560524A3; CS164218B2; BE791355A; GB1377840A; FR2159092A5; IT972857B; CH543445A; DD101358A5; DE2164784A1; DE2164784C3; DE2164784B2

Abstract

Thread can be wound onto a first bobbin and then, without interruption, onto a second bobbin, by providing a threadengaging member adjacent to the second bobbin to hold a bight of thread stationary relative to that second bobbin, as it is rotated to begin positive winding of the following continuous thread portion. The thread-engaging member is a ring having a core smaller than the inside diameter of its adjacent hollow core bobbin and a resilient annular portion carried between the ring core having an outside diameter at least as great as the outside diameter of the empty bobbin. The annular portion is deformable for sliding a filled bobbin axially over the resilient portion; and, when the bobbin is removed, such portion resumes its original shape. The resilient annular portion may be flexible bristles for catching a bight of thread pulled across it or may be a perforated hollow ring connected to a suction source.

Description

United States Patent [191 Landwehrkamp May 28, 1974 APPARATUS FOR CONTINUOUSLY WINDING THREAD ONTO BOBBINS Hans Landwehrkamp, Gerolfing, Germany Schubert & Salzer Maschinenfabrik Aktiengesellschaft, lngolstadt, Germany Filed: .Nov. 29, 1972 Appl. No.: 310,223

Inventor:

Assignee:

Foreign Application Priority Data Dec. 27, 1971 Germany 2164784 US. Cl 242/18 A, 242/18 PW, 242/27 Int. Cl B65h 54/02, B65h 65/00 Field of Search 242/18 A, 18 PW, 27, 25 A,

References Cited UNITED STATES PATENTS 2,296,339 9/1942 Daniels 242/18 A UK 3,523,651 8/1970 Negishi 242/27 FOREIGN PATENTS OR APPLICATIONS 1,412,096 8/1965 France 242/18 A Great Britain 242/18 PW Great Britain 242/18 A Primary Examiner-Stanley N. Gilreath Attorney, Agent, or Firm-R, M. Van Winkle; Van Winkle R. M.

[57] ABSTRACT A smaller than the inside diameter of its adjacent hollow core bobbin and a resilient annular portion carried between the ring core having an outside diameter at least as great as the outside diameter of the empty bobbin.

' The annular portion is deformable for sliding a filled bobbin'axially over the resilient portion; and, when the bobbin is removed, such portion resumes its original shape. The resilient annular portion may be flexible bristles for catching a bight of thread pulled across it or may be a perforated hollow ring connected to a suction source.

6 Claims, 6 Drawing Figures APPARATUS FOR CONTINUOUSLY WINDING THREAD ONTO BGBINS The present invention relates to a thread bight catching device adjacent toa bobbin to hold a thread portion stationary relative to the bobbin and thereby facilitate positive control of the initial bobbin winding operation.

In many textile machine applications, continuous productivity depends on the ability to wind a continuous thread sequentially onto individual bobbins without interruption. To achieve such continuous operation, a bight of thread must be restrained relative to an empty bobbin as it is rotated to begin winding of thread onto it and/or to prevent stretch thread or yarn being placed in tension. Two examples of applications of such thread-catching devices are used for winding stretch yarns onto bobbins or for winding thread continuously produced by open end spinning machines.

In British Pat. No. 1,139,695, it has been suggested that two hollow core bobbins be axially aligned horizontally in spaced relationship. The thread-winding guide is then transferred upon filling of one bobbin to guide the thread for winding onto the second bobbin, without interruption of the thread feed. In order to catch and hold firmly a bight of thread between the adjacent spools, a toothed ring is provided for each bobbin and is mounted on the bobbin carrier. However, in order to permit the filled bobbin to be removed from its carrier, the bobbin core must pass over the toothed ring, so that the ring is limited to an outside diameter no greater than the inside diameter of the bobin core. Consequently, the ring has no portion extending into the path of the thread, as it extends between the filled bobbin and the outer surface of the adjacent unfilled bobbin. The result is that the interbobbin spanning thread bight is not caught and arrested by the toothed ring automatically and reliably.

Another means for grasping thread so that it will be positively wound onto an empty bobbin, is to provide special bobbins having a thread-holding covering on the thread-winding surface, as disclosed in German Offenlegungsschrift Pat. No. 2,] 10,082. Such special bobbins are expensive to manufacture, and have the disadvantage of collecting fibers or thread clippings, which collection shortly coats or clogs the covering, so it loses its thread-grasping capability. Frequent cleaning of such coverings is necessary, which is time-consuming, and the covering is easily damaged by brushing or manual scraping of the accumulated debris. I

It is the principal object of the present invention to provide a simple effective thread-catching device which reliably assists winding thread transferred from a filled bobbin to an empty one.

Another important object is to provide such a device which does not interfere with the axial doffing of bobbins.

The foregoing objects are accomplished by providing a thread-catching member on each bobbin carrier having its minimum outside diameter equal to the outside diameter of bobbins to be placed on the carrier. The periphery of the thread-catching device is resiliently flexible, at least throughout the region from its periphery inward to the inside diameter of the hollow core bobbin. Preferably, the thread-catching device is a brush having a cylindrical rigid core smaller than-the bobbin hollow core and resilient bristles extending from the core outward a distance such that the bristle tips define a ring having a diameter'at least as great as the outside diameter of the bobbin. The bristles may extend radially outward to simplify manufacture of the thread-engaging device. However, a more positive grip on the thread bight extending from the adjacent filled bobbin is effected if the bristles are inclined from radial lines cutting the bristle roots, so that the bristle tips project forwardly in the direction of rotation of the bobbin carrier. Alternatively, instead of bristles, a hollow resilient perforate ring could be provided, the interior of such ring being connected to a suction source creating an airstream for drawing an adjacent thread bight into engagement with the resilient ring. The thread-catching member is mounted on the bobbin carrier by quickly-releasible fastening means to facilitate removal and substitution for cleaning.

FIG. 1 is a front elevation of a bobbin carrier, on which is mounted a thread-catching member in accordance with the present invention, parts being broken away.

FIG. 2 is an end elevation of one type of threadcatching member, and FIG. 3 is a similar view of a modified thread-catching member.

FIG. 4 is an axial section through a filled bobbin partially removed from its carrier.

FIG. 5 is an axial section through a bobbin carrier, including a modified form of thread-catching device, with parts broken away.

FIG. 6 is a front elevation of a different type of bobbin carrier showing a thread-catching member in section.

Referring to FIG. 1, a bobbin carrier I receives a hollow core bobbin 2, which bobbin is rotated by frictional engagement with a drive roller 3. The core 4 of a thread-engaging brush having bristles 41 is connected to one end of bobbin carrier 1 by a screw 5. Alternatively, core 4 could be connected to carrier 1 by a snapengageable plug-and-socket connection for more rapid removal of the thread-engaging

member

4,41. Bristles 41 extend outward from core 4 a sufficient distance so that the bristle tips form a ring having an outside diameter at least as great as the outside diameter of the bobbin, and such bristles may project beyond such bobbin diameter.

Bristles 41 may project radially from the core 4, as shown in FIG. 2. Alternatively, inclined bristles 42 may be provided on core 4 as shown in FIG. 3, such bristles being inclined relative to radii of the core so that the bristle tips project forwardly in the direction of brush rotation. It has been shown experimentally that the

member

4,42 more effectively catches a bight of thread passed over it than does the

radial bristle member

4,41. It is preferred that bristles 41 are natural bristles to minimize abrasion of the thread and to avoid creation of electrostatic fields. Instead of natural bristles, bristle-like projections of resilient plastic, rubber or other resilient material could be mounted in the brush core.

While'the size of the brush core relative to the radial projection of the bristles is not critical, the core must be inscribable in a circle having a diameter sufficiently shorter than the inside diameter of bobbin 2 so that the bristles are of sufficient length to bend resiliently in a direction axially of the core. Therefore, the bobbin can be slid from the carrier and over the bristles without across and bending brush bristles 41,

permanently deforming the bristles into such a bent position.

After a bobbin aligned with, but spaced from, a bobbin 2 is filled, the following portion of the thread is transferred from the adjacent end of such filled bobbin, across the bristles of the thread-catching

member

4,41, to the adjacent end of the empty bobbin 2 by a conventional thread guide (not shown) reciprocably movable between adjacent bobbins. Because the threadcatching member is mounted closely adjacent to the bobbin end located more closely to the previously filled bobbin and the bristles 41 extend at least to the outer diametral extent of the empty bobbin, a bight of the transferred thread portion will engage the bristles and be caught thereby. Since

brush

4,41 rotates with the bobbin, the thread will be held stationary relative to a point on the bobbin periphery, so that the next following thread portion will begin winding onto the bobbin in response to bobbin rotation effected by roller 3.

As shown in FIG. 4, after the bobbin is filled to form a spool 6 of thread, the bobbin can be slid axially from the carrier, the interior of the hollow bobbin dragging or 42, to reduce automatically the effective brush diameter, and permit easy bobbin removal. The resilience of the bristles will cause them to resume their normal positions in planes transversely of the brush axis when the bobbin and its dragging force on the bobbin bristles are removed. Similarly, an empty bobbin is placed on the carrier by sliding it axially across the bristles and thereby bending such bristles in the direction opposite that shown in FIG. 4.

The resilient portion of the thread-catching member may be a resilient hollow annular ring 7, shown in FIG. as having a U-shaped cross section the closed bottom of which projects outwardly from core 8. The ring has a plurality of apertures 71 in its closed bottom. The core includes a passage 81 of T-shaped cross section, connecting the hollow of ring 7 with a bore 12 in the carrier 11. Bore 12 is connected to a suction source to draw air inward through apertures 71. The inward airstream created thereby will pull and hold an adjacent thread bight into engagement with ring 7. As shown in FIG. 5, core 8 has a projecting portion forming a plug receivable in a complemental socket in the end of carrier 11.

As previously described in connection with the brush type of thread-catching member, a full bobbin can be doffed and an empty one placed on the bobbin carrier 11 without removing member 7,8 because ring 7 is made of resilient material readily defonnable by the axial force exerted by a bobbin core wall, so that the diameter of the thread-catching member is reduced while such force is applied. After the axial force is relieved, ring 7 resiliently resumes its normal position shown in FIG. 5, so that the diameter of the threadcatching member again equals or exceeds the bobbin diameter.

In some installations, such as that represented by FIG. 6, frames 9 have

carrier members

91,92 forming end plugs for opposite ends of a bobbin 2. In this installation, bobbins doffed and placed in the frame without being slid over the thread-catching member. In such installations, the bristles 43 on a brush core 40, or an annular ring such as shown in FIG. 5, may have a shorter thread-catching member. It is, of course, essential, that the outside diameter be at least as great as that of the bobbin 2, as previously described,- so that a thread portion will be automatically received by the threadcatching member during the thread-transferring operation to effect winding of thread onto the bobbin immediately upon engagement of a thread portion with the empty bobbin surface.

I claim:

1. Apparatus for continuous winding of thread onto rotatable bobbins having transfer means for transferring a thread portion between a filled bobbin and an empty bobbin, said bobbins being arranged in end-toend spaced relationship, comprising a cantilever bobbin carrier having a free end, a bobbin having a carrierreceiving hollow therethrough and mountable on and demountable from said carrier by movement over said free end, and a thread-catching member mounted on said bobbin carrier free end adjacent to and axially aligned with a bobbin end, rotatable conjointly with said bobbin, and including a core having an extent in a diametral plane of said bobbin less than the diametral extent of said bobbin hollow and annular resilient thread-engaging means carried by said core, said resilient thread-engaging means having an outside diameter at least as great as the outside diameter of the adjacent bobbin end which diameter is resiliently changeable in response to movement of said bobbin over said threadcatching member.

2. The apparatus defined in claim 1, in which the annular thread-engaging means is a ring of bristles having roots mounted in the core.

3. The apparatus defined in claim 2, in which the bristles project radially outward from the axis of the thread-catching member. 4. The apparatus defined in claim 2, in which the bristles are inclined relative to radii from the axis of the thread-catching member, the bristle tips extending forward of such radii in the direction of rotation.

5. The apparatus defined in claim 1, in which the re silient thread-engaging means is a hollow annular ring having a plurality of apertures through its periphery, and suction means communicable with the ring hollow.

bobbin carrier free end.

Claims

1. Apparatus for continuous winding of thread onto rotatable bobbins having transfer means for transferring a thread portion between a filled bobbin and an empty bobbin, said bobbins being arranged in end-to-end spaced relationship, comprising a cantilever bobbin carrier having a free end, a bobbin having a carrier-receiving hollow therethrough and mountable on and demountable from said carrier by movement over said free end, and a thread-catching member mounted on said bobbin carrier free end adjacent to and axially aligned with a bobbin end, rotatable conjointly with said bobbin, and including a core having an extent in a diametral plane of said bobbin less than the diametral extent of said bobbin hollow and annular resilient thread-engaging means carried by said core, said resilient thread-engaging means having an outside diameter at least as great as the outside diameter of the adjacent bobbin end which diameter is resiliently changeable in response to movement of said bobbin over said thread-catching member.

3. The apparatus defined in claim 2, in which the bristles project radially outward from the axis of the thread-catching member.

4. The apparatus defined in claim 2, in which the bristles are inclined relative to radii from the axis of the thread-catching member, the bristle tips extending forward of such radii in the direction of rotation.

5. The apparatus defined in claim 1, in which the resilient thread-engaging means is a hollow annular ring having a plurality of apertures through its periphery, and suction means communicable with the ring hollow.

6. The apparatus defined in claim 1, in which the thread-catching member is releasibly mounted on the bobbin carrier free end.