Claims
- 1. A high speed winding apparatus comprising a traverse device, said traverse device being a rotatably driven, cylindrical, traverse roller with spiral grooves in the cylindrical surface thereof, said spiral grooves being of opposite hand for guiding the thread in traverse strokes thereof and having stroke reversal zones at respective opposite ends of the roller, the spiral grooves having a variable depth which increases progressively from a shallowest segment at or below the surface of the roller in the longitudinal mid-portion of the roller to a point of maximum depth preceding the point of stroke reversal of the respective stroke reversal zones, and the respective spiral grooves then immediately decreasing in depth at a first rate of decrease to about the point of stroke reversal, and thereafter decreasing in depth at a rate of decrease greater than said first rate to a shallowest groove depth in the longitudinal mid-portion of the roller.
- 2. A high speed winding apparatus as claimed in claim 2, said spiral grooves being continuous, crossing grooves having their shallowest segments at the longitudinal mid-portion of said roller.
- 3. A high speed winding apparatus as claimed in claim 1, embodying in combination with said traverse device another traverse device having a reciprocable guide for guiding the thread in traversing winding strokes, the latter traverse device being the first traverse device through which the thread runs, and means for reciprocably driving said thread guide to provide reciprocable movement of the guided, running thread in leading relationship to the reciprocable movement of the thread in said spiral grooves to provide a lag angle to lay the thread at proper angles for guidance in the respective portion of the spiral groove in which the thread is positioned at any given time during the traverse movement of the running thread by the reciprocating thread guide and said spiral grooves of said rotating, cylindrical, traverse roller.
- 4. A high speed winding apparatus as claimed in claim 1, embodying in combination with said traverse device another traverse device having a reciprocable thread device for guiding the thread in traversing winding strokes, the latter traverse device being the first traverse device through which the thread runs, and means for reciprocably driving said thread guide to provide reciprocable movement of the guided, running thread in leading relationship to the reciprocable movement of the thread in said spiral grooves to provide a lag angle to lay the thread at proper angles for guidance in the respective portion of the spiral groove in which the thread is positioned at any given time during the traverse movement of the running thread by the reciprocating thread guide and said spiral grooves of said rotating, cylindrical, traverse roller, said thread guide being reciprocably driven by drive means embodying a cross-spiral grooved roller, the groove of which at the stroke ends having before and/or after the stroke reversal point a pitch angle greater than the pitch angle in said mid-range and also a greater radius of curvature at said stroke ends.
- 5. A high speed winding apparatus as claimed in claim 1 wherein the walls of said spiral grooves and said cylindrical surface of said roller have a matte finish with a depth of roughening in said matte finish of about 1.5 to 40 microns.
- 6. A high speed winding apparatus as claimed in claim 5 wherein said depth of roughening is about 3 to 10 microns.
- 7. A high speed winding apparatus as claimed in claim 1 wherein said spiral grooves respectively begin at the cylindrical surface of the longitudinal mid-portion of said roller and end on the cylindrical surface of said roller at said point laterally displaced from the longitudinal mid-portion of said roller.
- 8. A high speed winding apparatus comprising a traverse device, said traverse device being a rotably driven, cylindrical, traverse roller with spiral grooves in the cylindrical surface thereof, said spiral grooves being of opposite hand for guiding the thread in traverse strokes thereof and having stroke reversal zones at respective opposite ends of the roller, the spiral grooves having a variable depth which increases progressively from a shallowest segment at or below the surface of the roller in the longitudinal mid-portion of the roller to a point of maximum depth preceding the point of stroke reversal of the respective stroke reversal zones, which depth then decreases from said first-mentioned point to a second point preceding said point of stroke reversal, then again increases to a point substantially at the point of stroke reversal, and then again decreases to a shallowest groove depth in the longitudinal mid-portion of said roller.
- 9. A high speed winding apparatus as claimed in claim 8, said spiral grooves being continuous, crossing grooves having their shallowest segments at the longitudinal mid-portion of said roller.
- 10. A high speed winding apparatus as claimed in claim 8, embodying in combination with said traverse device another traverse device having a reciprocable guide for guiding the thread in traversing winding strokes, the latter traverse device being the first traverse device through which the thread runs, and means for reciprocably driving said thread guide to provide reciprocable movement of the guided, running thread in leading relationship to the reciprocable movement of the thread in said spiral grooves to provide a lag angle to lay the thread at proper angles for guidance in the respective portion of the spiral groove in which the thread is positioned at any given time during the traverse movement of the running thread by the reciprocating thread guide and said spiral grooves of said rotating, cylindrical, traverse roller.
- 11. A high speed winding apparatus as claimed in claim 8, embodying in combination with said traverse device anoother traverse device having a reciprocable thread device for guiding the thread in traversing winding strokes, the latter traverse device being the first traverse device through which the thread runs, and means for reciprocably driving said thread guide to provide reciprocable movement of the guided, running thread in leading relationship to the reciprocable movement of the thread in said spiral grooves to provide a lag angle to lay the thread at proper angles for guidance in the respective portion of the spiral groove in which the thread is positioned at any given time during the traverse movement of the running thread by the reciprocating thread guide and said spiral grooves of said rotating, cylindrical, traverse roller, said thread guide being reciprocably driven by drive means embodying a cross-spiral grooved roller, the groove of which at the stroke ends having before and/or after the stroke reversal point a pitch angle greater than the pitch angle in said mid-range and also a greater radius of curvature at said stroke ends.
- 12. A high speed winding apparatus as claimed in claim 11 wherein the walls of said spiral grooves and said cylindrical surface of said roller have a matte finish with a depth of roughening in said matte finish of about 1.5 to 40 microns.
- 13. A high speed winding apparatus as claimed in claim 12 wherein said depth of roughening is about 3 to 10 microns.
- 14. A high speed winding apparatus as claimed in claim 8 wherein said spiral grooves respectively being at the cylindrical surface of the longitudinal mid-portion of said roller and end on the cylindrical surface of said roller at said point laterally displaced from the longitudinal mid-portion of said roller.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 2040479 |
Aug 1970 |
DT |
|
RELATED APPLICATION
This application is a continuation-in-part of our copending application Ser. No. 289,152, filed Sept. 14, 1972, now U.S. Pat. No. 3,861,607.
It is the principal objective of the present invention to provide high-speed cross-winding devices capable of producing winding packages of cylindrical shape with substantially uniform tension of the thread throughout the winding package even when such winding is done at high speeds exceeding 2500 m/min. These high-speed winding devices are capable of producing cylindrical packages of substantially uniform thread tension throughout at high winding speeds up to about 3000 to 4000 m/min.
The improvements herein over the cross-winding devices of the aforesaid application reside principally in the contours of the variable depth of the thread-guiding groove of the second traverse device, a roller with spiral thread guide grooves of variable depth.
Briefly, the invention provides (1) a first traverse device having a reciprocable thread guide for guiding the thread, and (2) a second traverse drive comprising a roller having spiral, thread-guiding grooves. The stroke length of the first traverse device is approximately equal to the distance between the stroke reversal points of the grooves of the grooved traversing roller. The apparatus has a drive for said reciprocable thread guide. The drive preferably reciprocates the thread guide through the stroke reversal zones at low deceleration and acceleration while imparting, before and/or after stroke reversal, a velocity of said thread guide which is greater than the velocity thereof while it traverses said mid-range. Preferably, the drive is a reversibly spirally grooved roller, the groove of which at the sroke ends having before and/or after the stroke reversal point a pitch angle greater than the pitch angle in said mid-range and also a greater radius of curvature at said stroke ends i.e., greater than would be the radius of curvature at the stroke ends with grooves pitched at the pitch angle of the mid-range, if the stroke length of said first traverse device is approximately equal to the maximum distance between the stroke reversal points of the grooves of the second traverse device.
The second traverse device is a rotating thread guide roller with thread guiding, spiral grooves. The second traverse device of this invention may be a rotatable roller having spiral thread guide grooves which extend continuously in spiral fashion over the traverse length of the roller, or which may be interrupted at the mid-portion of the traverse roller. Both traverse devices run--except in the vicinities of the stroke ends--according to the same law of motion, but with a certain constant lead of the first thread guide in order to take into account the lag of the thread between the first and second traverse device. Through this constant lead it is assured that the thread upon entry and exit from the grooves of the second rotating traverse roller runs onward at a constant speed in the traverse direction and without change of the lag or distribution angle.
During the running of the thread in the second traverse arrangement in the vicinities of the stroke ends, the frist traverse device, i.e., the thread guide, however, follows a principle of motion peculiar to it, the objective of which is to keep as small as possible, through as small as possible changes of velocity, the inertia forces acting on the thread guide as it reverses direction.
These small changes in velocity were hitherto possible to realize only when the stroke of the thread guide is considerably smaller than the stroke of the second traverse devices, the spiral thread guide grooves. With this motion of the thread guide, it has been demonstrated that the thread, because of excessive deviation of its running direction from the thread guide groove direction, is occasionally pulled out of the thread guide groove. This occurs especially when--as provided according to a preferred embodiment of said application--the guide groove has immediately after the reversal point an increased pitch angle. Thereby there exists the problem of disturbances of the thread distribution and of thickenings or hard zones in the winding. These can lead to uneven engagement of the friction drive roller against the package, damage to the thread and to the slippage of the threads down end faces of the packages.
The thread guide grooves of the thread guide roller preferably extend spirally continuously over the length of the roller, or alternatively extend spirally from the longitudinal mid-portion of the roller to the respective stroke reversal zones at each end of the roller and thereafter return spirally to a terminus point short of the mid-portion of the roller. These spiral grooves have a special variable depth wherein the depth increases progressively from the mid-portion of the roller to a maximum depth at a point preceding the place of stroke reversal of such grove. In a first embodiment, the depth immediately decreases from said point at a rate less than the rate of increase immediately preceding said point to a point immediately preceding, at or beyond the point of stroke reversal of the groove.
The next portion of the groove following the stroke reversal point preferably decreases at a rate of inclination more sharply than the rate of increase of depth of the portion of the groove between the mid-point of the roller and the aforesaid maximum depth. After this more sharp rate of decrease in depth of the thread groove, the rate of decrease of depth is at a lesser value than the sharp rate of decrease to the terminus point of the end of the groove or to mid-point of the roller, the latter being applicable to the embodiment with a continuous, uninterrupted spiral groove.
In a second embodiment, the depth of the groove similarly increases progressively from the mid-portion of the roller to a maximum depth at a point preceding the place of stroke reversal of the groove. At said point, the groove depth immediately sharply diminishes to a second point also preceding the place of stroke reversal. At the second point, the groove depth again begins to increase to a third point having a depth less than the depth of the first point. The third point is substantially at the place of stroke reversal. At the third point the groove resumes its decrease in depth, which continues until the groove reaches its shallowest depth or merges with the cylindrical surface of the roller.
It is important to maintain a low friction between the grooves and the thread running therein and also between the cylindrical surface of the roller and the thread running thereover. The grooved roller constituting the second traverse device preferably runs at a peripheral velocity which is greater than the peripheral velocity of the drive roller which rotates the winding package. The drive roller, on the other hand, has a higher friction with the running thread and with the thread on the winding package. These differences in friction are attained by differences in the character of the surface of the rollers and the walls of the grooves. The higher friction is attained by polishing the surface of the drive roller, while the surface and walls of the grooves of the traversing roller have a matte finish.
The thread runs over the grooved roller in a manner wherein the contact arc between the running thread and the grooved roller is at least 60.degree., preferably about 90.degree.. This contact arc, coupled with the independently controlled peripheral velocity of the grooved roller and its matte finish for providing a low co-efficient of friction with the thread running thereover, facilitates control of the uniformity of the desired tension of the thread running off the grooved roller onto the winding pckage. The latter is driven by the higher friction drive roller at a predetermined constant peripheral velocity of the package by a separate drive for the friction drive roller. By the capability to adjust the tension of the thread portion running from the grooved traversing roller onto the winding package through varying the peripheral velocity of the low friction, grooved traversing roller, the thread manufacturer or processor may select, depending upon the particular requirements, a tension for such thread portion, which is:
1. greater than the thread tension of the portion running between the thread delivery device (e.g., a godet) and the low friction, grooved traversing roller by using a peripheral velocity of the latter which is less than the peripheral velocity of the drive roller;
2. the same tension by using equal peripheral velocities; or
3. a lesser tension by using a greater peripheral velocity of the grooved traversing roller.
As the thread proceeds in its traverse path from the mid-portion of the grooved, thread-traversing roller toward the stroke reversal zone, there is an increasing tendency toward a tension build-up in the running thread, particularly at the stroke reversal zones. To overcome this problem, it is preferred, in accordance with certain embodiments of the invention, to utilize the variable depth grooves as afore-described. Such variable depth grooves, particularly in combination with higher peripheral velocity of the grooved, thread-traversing roller than the peripheral velocity of the drive roller, and the lower friction finish of its cylindrical surface and the walls of the grooves, enable the winding of cylindrical packages without hard ends and with substantially uniform tension at velocities even exceeding 3000 m/min. As is known in the art, such variable tensions of the thread in the winding package lead to subsequent technical difficulties in dyeing or other processing of the thread, to cylindrical packages with hard ends, and poor laying of the superposed winding layers on the winding package.
The controllable peripheral velocity of the grooved transverse roller, particularly one with the variable depth of the spiral crossing grooves, enables the winding at high winding speeds of 1500 to about 4000 m/min without serious tension fluctuation during the traverse stroke, which may reach 600 m/min. With known winding devices operating at high winding speeds, such uncontrolled tension and tension build-up or break-down changes would cause the running thread to climb up out of the spiral grooves, particularly in the traverse stroke reversal zones, and/or take the path of the oppositely spiralled groove at the groove crossing points.
An advantage of the invention lies in that it makes it possible to keep the speed changes of the thread guide in the reversal places within suitable limits, but nevertheless, to adapt the thread guide stroke to the stroke length between the thread guide grooves. Through this adaptation of the movements of the thread guide to those of the thread guide grooves it becomes possible to construct the thread guide grooves in such a way as is required for the even distribution and, in particular, for the exact reversal of the thread in the package edges without danger that the thread guide grooves will lose the thread.
US Referenced Citations (8)
Foreign Referenced Citations (4)
| Number |
Date |
Country |
| 1,005,880 |
Apr 1957 |
DT |
| 14,153 |
Jan 1906 |
UK |
| 552,207 |
Mar 1943 |
UK |
| 728,529 |
Apr 1955 |
UK |
Continuation in Parts (1)
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Number |
Date |
Country |
| Parent |
289152 |
Sep 1972 |
|
Patent Grant
3945581
