US3797767A

US3797767A - High-speed cross-winding device

Info

Publication number: US3797767A
Application number: US00170009A
Authority: US
Inventors: H Schippers; E Lenk
Original assignee: Barmag Barmer Maschinenfabrik AG
Current assignee: Oerlikon Barmag AG
Priority date: 1971-08-09
Filing date: 1971-08-09
Publication date: 1974-03-19
Anticipated expiration: 1991-03-19

Abstract

High-speed cross-winding apparatus with two traverse motion devices for winding elongated materials, especially continuous filaments, such as tapes and threads into packages, particularly at filament velocities exceeding 1,500 m/min. and embodying a first traversing device in the form of a reciprocable thread guide, and a second traversing device in the form of a pair of rotatable thread guide means taking over the thread traverse stroke near the respective ends of the traverse stroke of said first device, means for driving said first and second traverse motion devices synchronously with each other, and independent means for rotatably driving the package. The second, stroke reversal device temporarily accelerates stroke velocity above the stroke velocity of the first device before and/or after stroke reversal, and the guide groove of the first device has a greater pitch before and/or after stroke reversal and an enlarged radius of stroke reversal curvature.

Description

Unite States HIGH-SPEED CROSS-WINDING DEVICE [75] Inventors: Heinz Schippers; Erich Lenk, both of Remscheid, Germany [73] Assignee: Barmag Barmer Maschinenfabrik Aktiengesellschaft, Wuppertal, Germany 22 Filed: Aug. 9, 1971 21 Appl.No.: 170,009

[52] US. Cl 242/43, 242/432, 242/158.3 [51] Int. Cl B65h 54/30 [58] Field of Search 242/43, 43.2, 158.5, 158.3

[56] References Cited UNITED STATES PATENTS 3.089.657 5/1963 Chaussy 242/43 FOREIGN PATENTS OR APPLICATIONS 552,207 3/1943 Great Britain 242/43 Primary Examiner-Stanley N. Gilreath Attorney, Agent, or Firm--Johnston, Keil, Thompson,

[57] ABSTRACT High-speed cross-winding apparatus with two traverse motion devices for winding elongated materials, especially continuous filaments, such as tapes and threads into packages, particularly at filament velocities exceeding 1,500 m/min. and embodying a first traversing device in the form of a reciprocable thread guide, and a second traversing device in the form of a pair of rotatable thread guide means taking over the thread traverse stroke near the respective ends of the traverse stroke of said first device, means for driving said first and second traverse motion devices synchronously with each other, and independent means for rotatably driving the package. The second, stroke reversal device temporarily accelerates stroke velocity above the stroke velocity of the first device before and/or after stroke reversal, and the guide groove of the first device has a greater pitch before and/or after stroke reversal and an enlarged radius of stroke reversal curvature.

3 Claims, 2 Drawing Figures Pmmenumsmq 3791.767

sum znr 2 I n'" if LEGEND INVENTORS HEINZ SCHIPPERS .ERICH LENK 0 AT TOR N EYS HIGH-SPEED CROSS-WINDING DEVICE RELATED APPLICATION The invention herein relates to improvements in winding apparatus with dual traverse devices vof the type disclosed in application Ser. No. 884,933, filed Dec. 15, 1969, by Heinz Schippers, now abandoned. The disclosure thereof is incorporated herein by reference.

INTRODUCTION The winding device'of said application operates with I two traverse devices. The first traverse device is constructed as a reciprocated thread guide and handles the distribution of the thread on the package in the middle range of the traverse stroke. The second traverse device is a rotating thread guide means, preferably a thread guide groove, which is located exclusively in the two end zones of the traverse stroke. At these places it takes over the distribution of the thread onto the package. Both traverse devices run except in the vicinities of the stroke ends according to the same law of motion, but with a certainconstant lead of the 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 on entry and in exit from the second rotating traverse arrangement runs onward at a constant speed in the traverse direction and without change of the lag or distribution angle.

During the running'of thethread in the second traverse arrangement in the vicinitie s of the stroke ends,

the first 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 asit 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 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 torn 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 problemof 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 INVENTION It is the objective of the present invention to remedy these difficulties. According to the invention this is accomplished by guiding the reciprocating first traverse device during the running of the thread in the thread guide groove of the second traverse device through its stroke reversal places with a slight speed change and before and/or after its stroke reversal with a temporary, greater speed than that maintained in the middle range of the traverse stroke, the stroke length of the first traverse device being approximately equal to the stroke length between the thread guide grooves.

Briefly, the invention provides (1) a first traverse device having a reciprocable thread guide for guiding the thread over the mid-range of the winding strokes, and (2) a second traverse drive having spaced grooves for picking up and guiding the thread at the respective ends of the strokes, the stroke length of said first traverse device being approximately equal to the maximum distance between said grooves. The apparatus has drive means for said thread guide for moving said thread guide, while said thread is in said grooves, through the stroke reversal zones at low deceleration and acceleration while imparting, before and/or after stroke reversal, a velocity to said thread guide which is greater than the velocity thereof while it traverses said mid-range. Preferably, the drive means is a reversibly spirally 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 midrange 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.

The 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.

THE DRAWINGS In the following description, the invention is illustrated with a preferred embodiment illustrated in FIGS. 1 and 2, wherein;

FIG. 1 is a plan view of the traverse devices, the drive roller, and the winding package with the thread thereon; and

FIG. 2 is a graphic projection of the movement of the traverse devices and the distribution of the thread onto the package, the ordinate being the stroke (H) and the abscissa being the development r'qb.

THE PREFERRED EMBODIMENT The first traverse device is a thread guide 1, which in FIG. 1 has the instantaneous direction of movement 1 and is driven by the reverse thread roller 24. The second traverse device is a parallel cylinder 2 with the thread guide grooves 5 and 6 at the stroke ends. The cylinder 2 has the direction of rotation 2. The thread 7 coming from the delivery mechanism 8 through the fixed thread eye 9 is guided in the zone of the traverse stroke ends over the thread guide 1 into the groove 5 and from this onto the winding package 3, which is driven by drive roller 4 in the direction of rotation 3'.

In the process there occur the following angles:

The lag angle 18 is the angle formed by the thread portion between thread guide 1 and thread guide groove 5 or 6. The angle 19 is that between thread 7 and thread guide groove 5 or 6. The distribution angle 20 is that formed by the thread running onto the winding package.

The

curves

11, 12, 13 of FIG. 2 represent the movement of the thread guide 1, of the thread guide grooves 5 and 6 and of the run-on point 7' of the thread 7 onto the package 3. In principle, all the movements, except in the zones of the stroke ends, follow the same laws of motion with a phase displacement in time. The underlying requirement for the avoidance of irregularities in the windings with respect to hardness and thickness is the maintenance of the sharp cornered curve 13 for the run-on point 7 of the thread 7 onto the package 3 as exactly as possible during reversal of the thread at the edges 13.

In order to bring about this exact reversal of the thread, the aforesaid application provided that the thread guide grooves 5 and 6 do not reverse at point 13 but, in correspondence to the curve 12, had an overstroke l2 and thereupon an increased pitch angle 12". The thread guide 1 cannot follow the principle of motion along curve 13 in the zone of the stroke ends, since then there would occur inadmissibly high inertial forces resulting from the sudden decelerations or accelerations. For this reason, the thread guide 1 in a typical thread guide drive reverses with only slight delay or acceleration in correspondence to the curve 11. Through the overstroke 12' of the thread guide grooves 5 or 6 on the one hand, and through the gentle reversal 11 of the thread guide 1 on the other hand, however, the angle 19 (FIG. 1) between the running thread 7 and the thread guide groove 5 becomes so great that the thread is easily pulled out of the groove.

In order to avoid this, the thread guide drive according to this invention follows, in an example of execution, the curve 11" which is distinguished besides by small delay of accelerations at its stroke reversal points, by a stroke length increase with respect to the curve 11 and an increased velocity in the zone 14 after the reversal of the stroke for the re-attaining of the synchronous traverse movements of the traverse devices 1 and 2 and of the thread in the middle stroke range 17. It is likewise possible to maintain an increased velocity analogously to 14 only in the zone before the reversal.

Another possible example uses for the thread guide drive a principle of movement according to curve 11". This is distinguished, besides by a still less rate of deceleration or acceleration at the stroke reversal places, by the increased velocities in the

zones

15 and 16 before and after stroke reversal.

In all cases, through the temporarily increased velocity of the thread guide, it becomes possible to adapt its stroke to the stroke of the second traverse device despite low acceleration or deceleration values in the reversal zone, in which system its stroke there can be greater or smaller than the stroke of the thread guide grooves 5 or 6.

The temporarily increased velocities of the thread guide 1 are achieved, in the case of drive by the reverse thread roller 24, by the increased

pitch angles

21 and 22 of the reversal thread. This simultaneously makes possible an increase of the radius of curvature 23 to provide a reduction of the velocity change at stroke reversal.

It is thought that the invention and its numerous attendant advantages will be fully understood from the foregoing description, and it is obvious that numerous changes may be made in the form, construction and arrangement of the several parts without departing from the spirit or scope of the invention, or sacrificing any of its attendant advantages, the form herein disclosed being a preferred embodiment for the purpose of illustrating the invention.

The invention is hereby claimed as follows:

1. A high speed winding appratus comprising a first traverse device having a reciprocable thread guide for guiding the thread over the mid-range of the winding strokes, a second traverse device embodying a roller having groove means for guiding the thread at the respective ends of the strokes and providing stroke reversal zones to impart stroke reversal to the thread guided therein, said stroke reversal zone embodying groove portions of given pitch and an intermediary curved groove segment at the stroke reversal point, at least one of said groove portions having an increased pitch, relative to said given pitch immediately following said intermediary curved groove segment to provide respective overstrokes to the guided thread, the stroke length of said first traverse device being approximately equal to the maximum distances between said groove means, and drive means for said thread guide for moving said thread guide, while said thread is in said groove means, through the stroke reversal zones at low deceleration and acceleration while imparting, before and/or after stroke reversal, a velocity to said thread guide which is greater than the velocity thereof while it traverses said mid-range, said drive means being a reversibly spirally grooved roller, the grooves 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 midrange and also an enlarged radius of curvature at said stroke ends.

2. A high speed winding apparatus as claimed in claim 1, wherein the grooves of said reversibly spirally grooved roller have a maximum distance between their stroke reversal points which is smaller than the maximum distance between said groove means of said second traverse device and the length of the package.

3. A high speed winding apparatus as claimed in claim 2, wherein the grooves of said reversibly spirally grooved roller have only after its stroke reversal point a pitch angle greater than the pitch angle in said midrange.

IUNTIED 'STA'iES PATENT-*oFFIcE I PatentiNoQ '3.,7'9'7',7-67 "bated March 19,1974

Inventor(s) I Heinz 'Schip-pers' and Erich Lenk It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

First page, ninth-line, insert;

-[30] Foreign Application Priority Data August 14, 1970 Germany P 20 40 479.9

Signed and sealed this 13th day of August 1974.

(SEAL) Attest:

MCCOY M. GIBSON, JR.

C. MARSHALL DANN Attesting Officer Commissioner of Patents FORM PO-1 050 (10-69) USCOMM-DC 60376-P59 us. GOVERNMENT PRINTING OFFICE I969 o-aes-asm

Claims

1. A high speed winding appratus comprising a first traverse device having a reciprocable thread guide for guiding the thread over the mid-range of the winding strokes, a second traverse device embodying a roller having groove means for guiding the Thread at the respective ends of the strokes and providing stroke reversal zones to impart stroke reversal to the thread guided therein, said stroke reversal zone embodying groove portions of given pitch and an intermediary curved groove segment at the stroke reversal point, at least one of said groove portions having an increased pitch, relative to said given pitch immediately following said intermediary curved groove segment to provide respective overstrokes to the guided thread, the stroke length of said first traverse device being approximately equal to the maximum distances between said groove means, and drive means for said thread guide for moving said thread guide, while said thread is in said groove means, through the stroke reversal zones at low deceleration and acceleration while imparting, before and/or after stroke reversal, a velocity to said thread guide which is greater than the velocity thereof while it traverses said mid-range, said drive means being a reversibly spirally grooved roller, the grooves 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 an enlarged radius of curvature at said stroke ends.

3. A high speed winding apparatus as claimed in claim 2, wherein the grooves of said reversibly spirally grooved roller have only after its stroke reversal point a pitch angle greater than the pitch angle in said mid-range.