US3847364A

US3847364A - Pattern disruption device for crosswinding machines

Info

Publication number: US3847364A
Application number: US00259588A
Authority: US
Inventors: J Rohner; W Maassen; E Haberkorn
Original assignee: W Schlafhorst AG and Co
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 1971-06-12
Filing date: 1972-06-05
Publication date: 1974-11-12
Anticipated expiration: 1991-11-12
Also published as: DE2129318C2; BE784756A; CH535710A; CS167354B2; IT958320B; JPS5952138B1; DE2129318A1

Abstract

In a crosswinding machine, a pattern disruption device, includes a crosswinding spool, a rotational member in frictional contact with said spool for effecting rotation thereof, means for intermittently driving the member and means for varying frictional contact between the crosswinding spool and the rotational member.

Description

United States Patent rm Roh ner et al.

'[4 1 Nov. 12, 1974 1 1 PATTERN DISRUPTION DEVICE FOR CROSSWINDING MACHINES [75] Inventors: Joachim Rohner, Rheydt; Wilhelm Maassen, Monchengladbach; Egon ll-laberkorn, Leusel, all of Germany W. Schlafhorst & C0., Monchengladbach, Germany 22 Filed: ,luneS, 1972 1211 Appl. No.: 259,588

[73] Assignce:

[30] Foreign Application Priority Data June 12, 1971 Germany 2129318 2 U.S. Cl. 242/181, 242/355 R [51 Int. Cl. B65h 54/38 58 Field of Search 242/181, 35.5 R, 35.6 R, 242/18 R18 DD [56] References Cited UNITED STATES PATENTS 2,066,494 1/1937 Swanson 242/1811 3.031478 5/1962 Furst 242/351 R FOREIGN PATENTS OR APPLICATIONS 586,069 3/1947 Great Britain .4 242/181 897,882 5/1962 Great Britain 242/181 Primary E.\uminerStanley N. Gilreath Attorney, Agent, or Firnz-Herbert L. Lerner [57] ABSTRACT In a crosswinding machine, a pattern disruption device, includes a crosswinding spool, a rotational memher in frictional contact with said spool for effecting rotation thereof, means for intermittently driving the member and means for varying frictional contact between the crosswinding spool ancl the rotational memher.

3 Claims, 1 Drawing Figure PATTERN DISRUPTION DEVICE FOR CROSSWINDING MACHINES The invention relates to a pattern disruption device for crosswinding machines wherein a crosswinding spool is rotated by means of an intermittently driven rotating member in frictional contact with the periphery thereof. v

Such devices have as their objective the prevention of the formation of so-called pattern windings which are produced on the spool periphery during the wind ing operation from time to time, preferably, however, within specific diameter ranges.

In order to attain this objective, it has been known heretofore to drive the crosswinding spool which engages a yarn guiding drum with a more-or-less strong compressive force in such a manner that the yarn guiding drum which reciprocatingly guidesv the yarn is brought into driving contact with the driving roller rotating at a constant rotational speed, through a friction roller which is pivoted periodically into operative posi-' tion. As a result thereof, after each interruption of the drive, and as the frictional roller is swung or pivoted back into operative position, the slip or backlash produced between the yarn guiding drum and the crosswinding spool tends to disrupt the formation of the pattern zone on the periphery of the winding member. A similar result is expected from heretofore known devices whose construction is based on the slip or backlash effect, wherein either the crosswinding spool is continuously lifted away from the rotational member by which it is driven or wherein the drive motor for the spool drive is continuously switched on and off. Another heretofore known possibility for disrupting patterns is for the crosswinding spool to be intermittently swung or pivoted about a transverse axis, in which case either the spool or the rotational member driving the spool must have a conical shape. By means of this feature, a periodically alternating take-up speed is supposed to be produced for the driving contact, the smallest to the largest diameter at constant driving speed for the rotational member.

The prior art devices of this general type are no longer sufficiently effective for the high take-up speeds that are to be attained nowadays and that are also permissible for the yarn material. Furthermore, these devices effect the build-up or wind-up and thereby the unwinding properties of a crosswinding or crosswound spool in an undesirable manner, since particularly the yarn guiding reliability is weakened and in consequence thereof a great number of irregular yarn layers is produced. Additionally, in the case of higher contact pressures a sufficiently effective slip or backlash between the crosswinding spool and the rotational member is no longer available.

It is accordingly an object of the invention to avoid the above-described disadvantages of heretofore known pattern disruption devices for crosswinding machines, wherein the crosswinding spool is caused to rotate by means of an intermittently driven rotational body in frictional contact with the periphery thereof.

With the foregoing and other objects in view, there is provided in accordance with the invention, a pattern disruption device wherein the crosswinding spool and- /or the rotational member are so disposed that the frictional contact between the crosswinding spool and the rotational member is intermittently varied. In this case, it is of particular advantage to vary the frictional connection therebetween intermittently by varying the compressive force. Thus, an additional slippage effect is produced without raising the crosswinding spool away from the driving rotational member which, for example, may be a winding shaft or a yarn guiding drum. The crosswinding spool is accordingly not fully lifted off, but rather is stress-relieved by being raised. Thus, in view of the elasticity of the spool body, the contact of a crosswinding spool with the driving rotational member is always maintained so that the yarn guiding reliability, especially, is not deteriorated in any manner. I

In accordance with a further feature of the invention,

the change of the frictional contact takes place in synchronism with the intermittent drive of the rotational member so that the intermittent drive of the rotational member occurs in the same rhythm as the intermittent variation in the frictional contact. In such a synchonous operation, it is also advantageous and in accordance with the invention, for the change in the frictional contact to be effected in counter-:synchronism to the intermittent drive of the rotational member so that, for example, the frictional contact between the rotational member and the crosswinding spool decreases when the driving connection has been restored and the frictional contact increases whenever the driving connection has been interrupted. In this way, by varying the instant of change within a disruption interval, the best possible disruption effect for the respective existing spool condition may be attained.

In order to attain optimal spooling condition during the entire build-up or formation of a crosswound spool, such as exact yarn guiding, unentangled yarn layering, as well as a clean spool form, it is particularly advantageous and in accordance with another feature of the invention for the change in the frictional contact during the winding to be effected within predetermined diameter ranges during the build-up or formation of the crosswound coil. Since pattern windings occur especially when the rotational speed relationship between yarn guiding drum and crosswinding spool is equal to or attains values such as 1:1.5, 1:2, 122.5, and so forth, the endangered diameter ranges may be ascertained very easily within a crosswinding spool and may then be translated to a cam plate or the like. Thus, if in accordance with the invention, a change in the frictional contact takes place only within these diameter ranges, it becomes possible during the remaining winding period, to take up the yarn without any pattern disruption effect, or to provide only the intermittent drive for the rotational member.

Other features which are considered as characteristic for the invention are set forth in the appended claims.

Although the invention is illustrated and described herein as embodied in pattern disruption device for crosswinding machines, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.

The construction and method of operation of the invention, however, together with additional objects'and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying single FIG URE of the drawing which is a schematic, elevational the invention.

By way of introduction a winding machine of the general type being considered herein is disclosed in US. Pat. No. 3,033,478 issued May 8, 1962.

Referring now to the attached FIGURE, there is shown therein a crosswinding spool 1 being wound with a thread F coming from a supply coil or cop 27. The crosswinding spool 1 is driven peripherally by a rotational member 2, which is in the form of a yarn guiding drum. The drive of the rotational member 2 is rotated by a continuously driven driving roller 3, which rotates with constant rotary speed through a friction roller 4 which is intermittently pivotable into and out of position between the drive roller 3 and the rotational member 2. The intermittent motion is produced by an oscillating pivot shaft 5 and transmitted through a lever 6 and a rod 7 to a rocker arm 8. During the travel of the yarn F, the rocker arm 8 is supported by the upper portion 28 of a sensing member 29 and thereby rocks a rocking lever 9, a rod 10 and a bell crank 11. By means of the bell crank 11 and a strap 12, the rocking movement is ultimately transferred to the friction roller 4. In the exemplified embodiment shown in the FIGURE, the change in the frictional contact between the crosswinding spool l and the rotational member, in accordance with the invention, occurs in synchronism with the intermittent drive of the rotational body through the frictional roller 4. Consequently, an additional lever 13 is fixedly connected to the oscillating shaft 5. The lever 13 is connected to a tension rod 14 to which clamping

member

15 and 16 are secured. The clamping

members

15 and 16 serve to hold and adjust

tension springs

18 and 19 which, in turn, are suspended from the lever end 17 which is pivotally mounted at 34. As the oscillating shaft 5 turns together with the levers 6 and 13, during the intermittent oscillating or rocking movements thereof in counterclockwise direction, the frictional roller 4 is brought into operative engagement through the rod 6 as well as the other component members described hereinbefore. A force is simultaneously exerted on the lever end 17 through the tension rod 14 and the tension springs 18 and 19, the force remaining ineffective, however, as long as an arm 20 engages a pawl 21. When the crosswinding spool attains a predetermined wound diameter, however, it can then, through a cam segment 23 fixedly secured to the spool frame 22, swing the pawl 21 about the pivot 24 thereof and withdraw the arm 20 from its point of contact. A spring 35 biases the pawl 21 in a clockwise direction about pivot 24 as shown in the drawing. The lever end 17 can now be swung away counterclockwise about pivot 34 by the tension spring 18 so that the detent 25 is brought into engagement in a gap between adjacent teeth of a tooth segment 26, also fixedly secured to the spool frame 22. The detent 25 is pivotally mounted on lever 17 at 30 and has a lug 31 adapted to contact lever 17. The lever 17 has a projection 32 and a spring 33 between the projection 32 and detent 25 which biases the latter in the position shown in the drawing. In this manner, the spool frame 22 and thereby the crosswinding spool 1 are stress-relieved by the adjustable force of the tension spring 18. The cam segment 23 in the exemplifled embodiment, is provided with four tooth-shaped contours which are associated with four diameter ranges within a crosswound spool, wherein the change, in accordance with the invention, of the frictional contact between the crosswinding spool 1 and the rotational member 2 are to be effective. The crosswinding spool 1 is shown in the drawing just before a first pattern zone is attained. We claim:

1. In a crosswinding machine, a pattern disruption device, comprising means supporting a crosswinding spool, a rotational member in frictional contact with said spool for effective rotation of said spool, means for intermittently driving said rotational member, and contact varying means for varying the magnitude of the frictional contact between said crosswinding spool and said rotational member while maintaining continuous physical contact between said crosswinding spool and said rotational member, synchronizing means operable to provide that the intermittent drive of said rotational member by said drive means occurs in a predetermined time relationship with the variation in magnitude of the frictional contact between said spool and said rotational member, wherein said synchronizing means operate in counter synchronism so that the magnitude of the frictional contact between said spool and said rotational member increases when said intermittent drive of said rotational member has been interrupted and decreases when said intermittent drive of said rotational member has been restored.

2. Device according to claim 1, wherein said contact varying means includes means responsive to a given range of diameters attained by said crosswinding spool during the winding of a thread thereon, whereby said contact varying means is actuated only during predetermined diameters of said crosswinding spool.

3. Device according to claim 1, wherein said contact varying means comprises biasing means and an actuating device for altering the contact pressure between said spool and said rotating member.