Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1994-08-23
1996-09-03
Mansen, Michael R.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
242 25R, 242 36, B65H 5728, B65H 5400
Patent
active
055516440
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of winding a wire-like product, such as a cable, on a flanged reel in a winding machine, wherein structure; cable turns wound between reel flanges by means of a guide; other with a pitch corresponding to the cable thickness per one cable turn, adjacent cable turns, which angle is changed at each reel flange through a position parallel with the flange into an opposite angle of lag when a cable turn comes into contact with the reel flange.
As used in this connection, the expression "wire-like product" refers to all kinds of long narrow continuous objects which can be wound on a reel, such as cables, conductors, and hoses, mainly products used in the manufacture of electric cables and data transmission conductors. For the sake of clarity, however, the invention will be described below with reference to a cable.
When a cable is wound on a reel or drum, a guide is used so that the cable will be positioned between the flanges of the reel in superimposed layers each comprising a number of adjacent cable turns.
In most prior art winding machines, e.g. U.S. Pat. No. 4,143,834 (FURUKAWA), U.S. Pat. No. 4,150,801 (KOBE STEEL), and U.S. Pat. No. 3,997,128 (FURUKAWA), the winding movements are effected by axially displacing the cable guide and the reel with respect to each other in the axial direction of the reel in such a way that when the reel accomplishes one revolution, the guide or the reel is displaced a distance equal to the thickness of the cable. The prior art winding machines are normally adjustable for handling reels having different drum diameters and different distances between the reel ends. The machines are also provided with a distributing machinery, by means of which the axial displacement between the guide and the reel for each revolution of the reel, i.e. the pitch at which the cable is wound on the reel, can be adjusted so that it always corresponds to the thickness of the cable to be wound.
It is well-known in the cable manufacture that the best and densest winding result on the reel is obtained when the cable to be wound forms an oblique angle of lag with respect to the axis of the reel during the winding.
It is also well-known that it is advantageous that the product to be wound is directed in parallel with the reel flange when a reeled cable turn comes into contact with the flange, i.e. that the angle of lag is reduced to zero. Swedish Patent Application 9000662 (NOKIA-MAILLEFER) discloses a winding machine in which the angle of lag is reduced to zero, that is, the cable is wound at right angles to the axis of the reel and in parallel with the reel flange by means of a simple rotatable pair of rollers. German Auslegeschrift 1 902 722 (ROSENDAHL) discloses a winding machine in which the reduction of the angle of lag to zero at the reel flange and its restoration to its proper value after the reversion of the direction of the displacing movement of the guide is performed by accelerating/retarding the displacing movement of the guide with respect to the reel.
A drawback of the above-mentioned winding methods and machines is that it is still difficult to wind the cable sufficiently densely at the critical reel flanges, where the direction of the guide is reversed and the cable starts a new layer upon the previous ones.
The object of the present invention is to provide a winding method which avoids the above-mentioned drawback and enables the cable to be wound densely and without disturbances even close to the reel flanges. This is achieved by means of a method which is characterized in that the angle of lag is changed into the position parallel with the flange before the cable turn comes into contact with the reel flange.
The method according to the invention is based on the idea that the angle of lag of the cable is reduced to zero, that is, the winding of the cable on the reel at right angles to the reel axis is started preferably several cable turns before the cable comes into contact with the reel flange and the guide reaches its turning point. In this w
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Mansen Michael R.
Nokia-Maillefer Oy
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