Winding machine with yarn traversing device

Details Winding machine with yarn traversing device Winding machine with yarn traversing device

2001-01-11

2002-08-20

Mansen, Michael R. (Department: 3654)

Winding, tensioning, or guiding

Helical or random winding of material

Distributing material along the package

C242S157100, C242S483500

Reexamination Certificate

active

06435448

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of co-pending German Patent Application No. 100 01 303.1 entitled “Spulmaschine”, filed on Jan. 14, 2000.
FIELD OF THE INVENTION
The present invention generally relates to a winding machine including a yarn traversing apparatus. Preferably, the winding machine is an apparatus for winding up continuously arriving yarn on bobbins. However, the invention is also applicable to other types of winding machines. The present invention also relates to a yarn traversing apparatus.
BACKGROUND OF THE INVENTION
A winding machine is known from German patent application No. 195 36 761 A1. The winding machine includes a yarn traversing apparatus including a housing. A drivable reversing screw thread shaft is supported inside the housing to be rotatable therein. The reversing screw thread shaft includes an endless screw thread groove. A traversing yarn guide includes a body, a shuttle engaging the groove of the shaft and a yarn guide. The traversing yarn guide is driven by the groove to move back and forth in an axial direction. The housing includes an elongated opening through which the yarn guide of the traversing yarn guide protrudes out of the housing. The winding machine further includes two guide rods for radially guiding the traversing yarn guide. For this purpose, the two guide rods are arranged parallel with respect to one another, and the body of the traversing yarn guide is connected to the parallel guide rods. The body includes two round bores through which the cylindrical guide rods extend. The guide rods extend over the entire length of the screw thread shaft and over the region of the screw thread shaft in which the endless screw thread groove is located, respectively. To prevent the traversing yarn guide from getting jammed at the guide rods, the two guide rods have to be assembled to be exactly parallel. The separate guide rods have to be manufactured, hardened and ground. It is a very important to exactly align the two guide rods during assembly.
Another winding machine is known from German patent No. 196 42 473 C1. The winding machine includes a yarn traversing apparatus including a housing, a reversing screw thread shaft and a traversing yarn guide. Two parallel guide bars are located at the housing in a way that they contact the body of the traversing yarn guide to guide it in a radial direction. The guide bars have to be separately manufactured, hardened and ground in the contact region to the body of the traversing yarn guide. Then, the guide bars have to be screwed to the housing. For this connection, a respective milled, plain surface is required at the housing. The milled surface causes the housing to be structurally weakened. The process of manufacturing, hardening and grinding the guide bars is rather complex and expensive.
SUMMARY OF THE INVENTION
The present invention relates to winding machine. The winding machine includes a yarn traversing apparatus including a housing having an elongated opening. A reversing screw thread shaft has an outer surface, it is rotatably supported in the housing and it includes an endless screw thread groove. A traversing yarn guide includes a body, a shuttle being designed and arranged to engage the endless screw thread groove, a yarn guide and a guide bush having an inner surface. The traversing yarn guide is designed and arranged to be driven by the reversing screw thread shaft to reciprocate in an axial direction. The yarn guide is designed and arranged to project out of the elongated opening of the housing. The inner surface of the guide bush is designed and arranged to at least partially surround the outer surface of the reversing screw thread shaft.
The present invention also relates to a yarn traversing apparatus. The yarn traversing apparatus includes a housing having an elongated opening. A reversing screw thread shaft has an outer surface, it is rotatably supported in the housing and it includes an endless screw thread groove. A traversing yarn guide includes a body, a shuttle being designed and arranged to engage the endless screw thread groove, a yarn guide and a guide bush having an inner surface. The traversing yarn guide is designed and arranged to be driven by the reversing screw thread shaft to reciprocate in an axial direction. The yarn guide is designed and arranged to project out of the elongated opening of the housing. The inner surface of the guide bush is designed and arranged to at least partially surround the outer surface of the reversing screw thread shaft.
With the novel winding machine and the novel yarn traversing apparatus, the traversing yarn guide is guided and supported in a radial direction in the inside of the housing and directly at the reversing screw thread shaft, but no longer outside of the housing and in the region of the elongated opening of the housing, as it is known from the prior art. This novel way of supporting the traversing yarn guide is rather cheap, and it may be are realized with a rather little number of components.
The outer circumferential surface of the reversing screw thread shaft is at least partially surrounded and enclosed by the inner circumferential surface of the guide bush of the traversing yarn guide. The guide bush at least surrounds the reversing screw thread shaft by more than 180 degrees to secure and support the traversing yarn guide in a radial direction. With the present invention, additional, separate guide elements, as guide rods or guide bars, are not required. The number of structural elements of the winding machine and of the yarn traversing apparatus is advantageously reduced. Since the reversing screw thread shaft usually is already ground for the contact to the shuttle of the traversing yarn guide, no additional operational step is necessary during the manufacture of the shaft to realize the novel function of the radial guidance of the traversing yarn guide. The manufacture of the housing of the yarn traversing apparatus is advantageously simplified since the region of the elongated opening does not have to provide for the radial support of the traversing yarn guide. Since only very little material has to be taken of the housing (compared to the material that has to be taken of the housing in case guide rods will be connected to the housing), the structural stability of the housing is improved. The inner circumferential surface of the guide bush and the outer circumferential surface of the shaft together form a relatively great supporting surface for the traversing yarn guide in a radial direction. Consequently, wear and tear occurring at the traversing yarn guide is reduced.
Preferably, the inner circumferential surface of the guide bush and the outer circumferential surface of the reversing screw thread shaft are ground, and they together form a sliding fit. As it has already been explained, the outer circumferential surface of the reversing screw thread shaft usually is already ground for the contact to the shuttle. Consequently, no additional operational step is necessary. Additionally, the inner surface of the guide bush is ground to realize a precise axial relative movement between the guide bush of the traversing yarn guide and the reversing screw thread shaft. Preferably, the guide bush only extends over a small axial portion of the shaft in a way that the surface of the guide bush that has to be ground is rather small. In this way, the grinding process of the inner circumferential surface of the guide bush takes less time, and it is less expensive.
The guide bush may be designed to be circumferentially closed. This means that the guide bush together with the body of the traversing yarn guide encloses the entire circumference of the reversing screw thread shaft. Such an arrangement has the advantage of very securely guiding the traversing yarn guide on the circumference of the reversing screw thread shaft in a radial direction. Tube material may be easily used for the manufacture of the guide bush. The guide bush and the body of the traversing yarn guide, respectively,

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