US3801038A

US3801038A - Chuck for a tube or sleeve and serving as a bobbin support

Info

Publication number: US3801038A
Application number: US00299024A
Authority: US
Inventors: O Wust
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 1972-09-07
Filing date: 1972-10-19
Publication date: 1974-04-02
Anticipated expiration: 1991-04-02
Also published as: AR197826A1; FR2203376A5; ES418547A1; NL177995C; NL177995B; GB1431107A; AT332263B; BR7306843D0; AU5978773A; NL7312016A; ATA656073A; CH558297A; DE2344377A1; DE2344377C2; IT990085B; DD106664A5

Abstract

A chuck or mandrel for a bobbin tube or sleeve serving as bobbin support embodying a thread catch ring and a thread severing ring defining therebetween a thread catching zone. The thread severing ring is provided at an end face with a substantially ring-shaped arrangement of spaced recesses and teeth formed between such recesses, these teeth each having an inner sharp cutting edge for engaging and separating or cutting a thread. The teeth are arranged in a direction facing away from the end face of the bobbin tube or sleeve. The thread catch ring is located at the region of the end face of the thread severing ring. This thread catch ring extends at least partially beneath the teeth of the thread severing ring when the tube is completely pushed onto the chuck. There are also provided thread clamping means.

Description

United States Patent 7 [191 Wust CHUCK FOR A TUBE OR SLEEVE AND SERVING AS A BOBBIN SUPPORT [75] Inventor: Olivier Wust, Seuzach, Switzerland [73] Assignee: Rieter Machine Works Ltd.,

Winterthur, Switzerland 22 Filed: Oct. 19, 1972 21 App]. No.2 299,024

[30] Foreign Application Priority Data Sept. 7, 1972 Switzerland 13135/72 [52] US. Cl 2.42/19, 242/18 PW, 242/18 A, 242/125.1

[51] Int. Cl B65h75/28, B6511 75/32- [58] Field of Search 242/19, 18 A, 18 PW, 25 A, 242/125, 125.1

[56] References Cited FOREIGN PATENTS OR APPLICATIONS 2,048,416 4/1971 Germany 242/18 A 1,097,204 12/1967 Great Britain 242/18 A 1 Apr. 2, 1974 Primary Examiner-Stanley N. Gilreath Attorney, Agent, or Firm-Werner W. Kleeman [57] ABSTRACT A chuck or mandrel for a bobbin tube or sleeve serving as bobbin support embodying a thread catch ring and a thread severing ring defining therebetween a thread catching zone. The thread severing ring is provided at'an end face with a substantially ring-shaped arrangement of spaced recesses and teeth formed between such recesses, these teeth each having an inner sharp cutting edge for engaging and separating or cutting a thread. The teeth are arranged in a direction facing away from the end face of the bobbin tube or sleeve. The thread catch ring is located at the region of the end face of the thread severing ring. This thread catch ring extends at least partially beneath the teeth of the thread severing ring when the tube is completely pushed onto the chuck. There are also provided thread clamping means.

15 Claims, 6 Drawing Figures BACKGROUND OF THE INVENTION The present invention relates to a new and improved construction of chuck or mandrel for a bobbin tube serving as a bobbin support and embodying a thread catch zone provided with a thread severing or separation ring arranged concentrically with respect to the chuck, the thread severing ring is provided at its end face with a ring-shaped arrangement of recesses and thus produced teeth each having an inner sharp cutting edge for engaging and cutting a thread. Such type chuck or mandrel is arranged, for instance, at a winder for endless filaments or threads equipped with an automatic bobbin change device.

There are already known to the art winder devices for endless threads having automatic bobbin change devices, wherein two bobbin tubes or sleeves alternately take-up the thread delivered at a high speed and after reaching a desired package or bobbin size, with simultaneous transfer of the thread to the empty bobbin tube or sleeve, are rocked out of a work position into an idle position. Thread transfer occurs in that the thread, which is not being traversed at the moment of thread transfer, is partially drawn over a thread severing or separtion ring owing to axial displacement of the bobbin chuck or mandrel and seized by suitable means and thus cut or separated and wound-up with a number of reserve windings applied to the bobbin tube or sleeve. The thread severing ring equipped with teeth arranged at an end face and rigidly connected with the chuck together with a confronting end face of the bobbin tube maintaining an intermediate space or compartment forms the thread catch zone. During the bobbin change operation the thread arrives at this intermediate space or compartment and is intended to be engaged by the teeth and separated or cut. Within the region of the teeth an outwardly tapering conical portion which slightly extends past the region of the teeth, i.e., tapers in the direction of free end of the tube, on the one hand, forms a stop for the bobbin tube and, on the other hand, the outwardly directed inclination of the conical portion allows, during doffing of the bobbin, easy removal of thread windings which possibly remain at such location.

The drawback of such devices is that the boundary surfaces of the thread insertionintermediate compartment and which boundary surfaces extend parallel and perpendicular to the axis and are formed on the one hand by the face of the teeth and on the other hand the end faces of the tube, as well as the outwardly tapering conical portion within the ring of teeth do not allow the thread to be guided with sufficient security into the cutting zone of the teeth. The cutting or separation of the thread is therefore not positively guaranteed, which during thread transfer can result in undesired disturbances.

A further drawback of such devices resides in the necessity of maintaining a given minimum height of the thread severing ring owing to the requirements of strength and the constructional design. Therefore, the tubes likewise must possess a minimum wall thickness which is governed by the foregoing, since the end faces of the tubes constitute a boundary surface of the thread catch zone.

SUMMARY OF THE INVENTION Hence, it is a primary object of the present invention to provide an improved chuck or mandrel construction for a bobbin tube which is not associated with the aforementioned drawbacks and limitations of the prior art constructions discussed above.

A further object of the invention relates to an improved construction of bobbin support chuck which positively ensures that the thread or the like will be severed during a bobbin change operation.

Now in order to implement these and still further objects of the invention, which will become more readily apparent as the description proceeds, the inventive I construction of bobbin support chuck which does not possess the aforementioned drawbacks, is manifested by the features that a chuck for a tube serving as bobbin support and having a thread catch zone is provided with a thread severing ring arranged concentrically with respect to the chuck. The thread severing ring is equipped at an end face with a substantially ringshaped arrangement of recesses and thereby formed teeth having inner sharp cutting edges for engaging and cutting a thread. The teeth are arranged in a direction which faces away from the end face of the tube. A thread catch ring is located at the region of the end face of the thread severing ring, this thread catch ring extending at least partially beneath the teeth by means of a conical thread guide surface when the tube is completely pushed onto the chuck. There are also provided thread clamping means. The thread severing ring is movably arranged upon the chuck in order to be able to easily remove any thread windings located between the thread severing ring and the thread catch ring.

' 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. 1 is a fragmentary longitudinal sectional view of a bobbin tube chuck with a bobbin tube mounted thereat;

FIG. 2 is an enlarged fragmentary perspective view of the thread severing or separation ring;

FIGS. 3, 4 and 5 are respective enlarged sections of a thread catch ring and thread severing ring; and

FIG. 6 is a fragmentary longitudinal sectional view of a further embodiment of bobbin tube chuck with a bobbin tube mounted thereat.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Describing now the drawings, and turning attention initially to the embodiment of FIG. 1, there is illustrated therein a chuck or mandrel 50 embodying a chuck or mandrel shaft 1 with a roller bearing 3 carrying a chuck sleeve 2. At the end of the chuck sleeve 2 facing the side of the machine, indicated by the directional arrow A, there is arranged a thread catch ring 4 which is fixedly connected with the chuck sleeve 2 by means of a bolt 5 or equivalent structure. A thread severing or separation ring 6 is displaceably arranged at a cylindrical sliding surface 7 between the thread catch ring 4 and a stop 8. This severing ring 6 possesses a collar 9 which slightly conically tapers in the direction of the sleeve as well as a stop for receiving a bobbin tube 11. Furthermore, the thread severing ring 6"possesses a ring-shaped row of substantially roof-shaped inclined or bevelled teeth 12 arranged in a direction pointing away from the end face of the bobbin tube. These teeth 12 are formed at their sides by recesses 13 tapering in radialdirection and at the outer surface by means of the surface 14 which tapers conically at an inclination slightly towards the tube 11- and internally by the conical surface 15 which tapers at an inclination away from the tube. By means of the conical surface 15 and the recesses 13 there is formed a cutting edge 16 which is positioned at an inclination with respect to the axis of the chuck.

The thread catch ring 4 possesses a conical guide surface 17'confronting the thread severing or separation ring 6, this conical surface 17 partially extending beneath the teeth 12 of such thread severing ring, as shown. Furthermore, the thread catch ring 4 possesses a cylindrical thread guide surface 18. As best seen by referring to FIG. 3 a thread clamping space or gap 19 is present between the thread catch ring 4 and the thread severing ring 6,.the width of which is governed by the spacing of end wall 20'of the thread severing ring 6 and end wall 21 of the thread catch ring 4. A projec-' tion in the form at a cam or dog 22 and belonging to the thread catch ring'4 determines such spacing.

FIG. 4 illustrates a variant .of the thread clamping space or gap 23 .wherein theboundaries or boundary surfaces thereof are formed by a conical surface 24 belonging to the thread catch ring 4 and the end or boundary surface 20 belonging to the thread severing or separation ring 6. y

In a further variant of the invention as depicted in FIG. 5 athread clamping space or gap 25 is formed by the conical surface 24 of the thread catch ring 4 and an end or boundary surface 26 of an elastic ring member 27 engaged by or seated at the thread severing or separation ring 6. This elastic ring member 27 is formed, for instance, of rubber or another suitable elastic material.

FIG. 6 illustrates a variant form of thread severing or separation ring 28 which is connected by a cylindrical surface 29 with the bobbin tube sleeve 11 and can be withdrawn together therewith from chuck sleeve 30.

Now, if during a bobbin change operation the thread should be transferred from the full bobbin tube or sleeve to the empty bobbin tube or sleeve, then by means of the cylindrical surface 18 and through axial displacement of either the thread 31 or the chuck or mandrel such thread slides over the conical guide surface 17 and therefore comes into the region of the respective thread clamping space or

gap

19, 23 or 25 and the teeth 12. The thread clamping space or

gap

19, 23 or 25 respectively, is positioned in the direction of the chuck sleeve 2 with regard to the cutting edge '16 in such a manner that the thread (FIG. 2) extending essentially perpendicular to the chuck axis is engaged by the relevant thread clamping space or gap and by means of the cutting edge 16 is flexed or bent at such cutting edge and guided along such cutting edge in the direction D (FIG. 2) and thus cut. Owing to this movement along the cutting edge 16* thick threads are also positively cut. Moreover, the thread 31 which is seized or engaged by the aforementioned clamping space or

gap

19, 23 or 25 respectively, is practically simulta neously guided through the recess 13 at the surface 14,

from which location the thread easily arrives at the bobbin tube 11 in order to deposit several reserve windings 32 owing to axial displacement of the chuck or the thread. Thereafter, there is formed at such reserve winding and after initiating the conventional traversing stroke a package 33, as such has been described, for instance, in Swiss Pat. No. 513,763. During doffing of the full bobbin in the direction of the arrow B (FIG. I) the thread severing ring 6 is displaced up to the region of the stop 8, or in the case of the embodiment of FIG. 6 withdrawn from the chuck together with the bobbin, so that the end of the thread 31 fixedly retained in the clamping space or

gap

19 or 23 or 25 respectively is freed and easily removed.

The described apparatus possesses, in contrast to the known solutions of the prior art, the following noteworthy advantages:

l. The thread is guided cleanly and positively at the region of the cutting elements.

2. Owing to the use of the novel thread severing ring of this invention there is overcome the initially discussed drawback of the prior required minimum wall thickness of the tubes determined by the height of the thread severing ring. The tubes can possess random wall thickness, only governed by the desired strength of the tubes.

3. Owing to the practically simultaneous cutting and guiding of the thread through the recess 13 at a cutting tooth 12 there are avoided windings between the thread catch ring and the thread separation ring, something which is a prerequisite for automatic unloading of the bobbins and loading of the empty tubes.

4. Reliable cutting of the thread in that the thread which extends essentially perpendicular to the bobbin axis is drawn over the cutting edges which are at an inclination with respect to the'bobbin axis.

5. Positive retention of the separated thread at the chuck after cutting for the faultless entrainment of the infed thread and therefore positive starting of the windmg.

6. The constructional embodiments are simple and therefore inexpensive.

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:

- l. A chuck device for a tube serving as a bobbin support, comprising a chuck sleeve, a thread catch ring and a thread servering ring defining therebetween a thread catch zone mounted on said chuck sleeve, said thread severing ring having an end face provided with a substantially ring-shaped arrangement of spaced teeth and intermediate recesses, each of said teeth having an inner sharp cutting edge for engaging and cutting a thread, said teeth being arranged in a direction which faces away from the end of the tube when mounted on the chuck sleeve, said thread catch ring being arranged at the region, of said end face of the thread severing ring, said thread catch ring having a thread guide surface extending partially beneath the teeth when the tube is completely pushed onto the chuck sleeve, and

thread clamp means for the thread.

2. The chuck device as defined in claim 1, wherein each of the teeth possess a conical outer surface inclined in the direction of the tube.

3. The chuck device as defined in claim 1, wherein each of the teeth possess a conical inner surface and said inner cutting edge is inclined.

4. The chuck device as defined in claim 3, wherein.

the conical inner surface tapers at an inclination away from the tube.

5. The chuck device as defined in claim 1, wherein the thread severing ring is mounted on the chuck sleeve so as to be movable therealong.

6. The chuck device as defined in claim 1, further including means for fixedly mounting the thread catch ring on the chuck sleeve.

7. The chuck device as defined in claim 1, wherein the thread catch ring possesses a conical thread guide surface defining said thread guide surface extending partially beneath the teeth.

8. The chuck device as defined in claim 1, wherein the thread catch ring possesses a cylindrical thread guide surface.

9. The chuck device as defined in claim 1, wherein the thread catch ring possesses a cylindrical thread guide surface and a conical thread guide surface extending in the direction towards the tube, at least one of said guide surfaces defining said thread guide surface extending partially beneath the teeth.

10. The chuck device as defined in claim 1, wherein the thread clamping means are defined by a gap formed between the thread catch ring and the thread severing ring.

1 l. The chuck device as defined in claim 10, wherein the gap is limited by essentially parallel walls.

1 2. The chuck device as defined in claim 10, wherein the gap is limited by conical boundary walls.

13. The chuck device as defined in claim 1, wherein the thread severing ring includes means for guiding and receiving the tube.

14. The chuck device as defined in claim 13, further including a stop, said thread severing ring being displaceably mounted on the chuck sleeve between the thread catch ring and the stop.

15. The chuck device as defined in claim 13, further including means for connecting the thread severing ring with the tube so that the thread severing ring can be withdrawn together with the tube from the chuck sleeve.

Claims

1. A chuck device for a tube serving as a bobbin support, comprising a chuck sleeve, a thread catch ring and a thread servering ring defining therebetween a thread catch zone mounted on said chuck sleeve, said thread severing ring having an end face provided with a substantially ring-shaped arrangement of spaced teeth and intermediate recesses, each of said teeth having an inner sharp cutting edge for engaging and cutting a thread, said teeth being arranged in a direction which faces away from the end of the tube when mounted on the chuck sleeve, said thread catch ring being arranged at the region of said end face of the thread severing ring, said thread catch ring having a thread guide surface extending partially beneath the teeth when the tube is completely pushed onto the chuck sleeve, and thread clamp means for the thread.

4. The chuck device as defined in claim 3, wherein the conical inner surface tapers at an inclination away from the tube.

11. The chuck deviCe as defined in claim 10, wherein the gap is limited by essentially parallel walls.

12. The chuck device as defined in claim 10, wherein the gap is limited by conical boundary walls.