Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1993-06-17
1995-04-25
Jillions, John M.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
2425416, B65H 67044, B65H 1822
Patent
active
054091730
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The instant invention relates to a winding device, and more particularly to a control device for controlling the contact pressure of a bobbin against its drive roller.
The winding of a delivered yarn into cross-wound bobbins on a variety of textile machines is known from the state of the art. This operation can, for instance, take place in winding machines and spinning/winding machines, e.g. rotor spinning machines. For this purpose, the winding device is as a rule equipped with a bobbin arm to hold and guide the bobbin. To drive the bobbin it is presented to a rotating roller which rotates the bobbin through friction. During the build-up of the bobbin, which is accompanied by an increase of bobbin diameter, the bobbin arm evens out the increasing bobbin diameter through a swivelling motion in such a manner that the bobbin is in contact with the roller at approximately the same location throughout the build-up.
A winding and bobbin holder is known from DE-OS 11 17 295, whereby the contact pressure of the bobbin against a roller which drives it is controlled by means of an adjustable spring. With this device, the pressure on the bobbin which is caused by gravity is at first increased as the bobbin is built up and is later lowered by means of a drive spring. The bobbin arm is here provided with a lever which supports the bobbin at one end as part of a rocking lever joint arrangement, while it is subjected at its other end to the force of a spring. During the build-up of the bobbin the rocking lever joint goes through its extended position, whereby the spring exerts force producing a pressure upon the bobbin. During further build-up of the bobbin, the rocking lever joint leaves its extended position again, so that the spring is now exerting a lifting force upon the bobbin arm. The spring force which decreases due to the extension of the spring is thereby more than compensated for by a longer lever arm upon which the spring acts. The purpose of this arrangement is to keep the contact pressure of the bobbin against the drive roller approximately constant during the entire build-up of said bobbin. Through suitable selection of the appropriate length of the rocking lever joint, it is also possible to decrease the contact pressure of the bobbin against the drive roller as the bobbin diameter increases. Depending on the application of the completed bobbin, it may be desired that the bobbin be wound with different contact pressures, e.g. with less contact pressure for dye bobbins. For other applications, it may be desired that the bobbin be wound tightly. For this purpose the spring of the winding mechanism of DE-OS 22 17 295 is provided with an adjusting screw by means of which the pre-stress of the spring can be changed. DE 25 18 646 C2 discloses a device for the control of the contact pressure of a textile bobbin in which the extension position of the rocker lever arrangement, as well as the pre-stress of the pressure spring, can be changed.
DE-OS 22 20 727 discloses a device to produce the contact pressure for bobbins in which one or two springs are intermittently assigned to a pressure device during the build-up of the bobbin. Here, too, an adjustability of pre-stress of the pressure spring, as well as a change of the lever arm on which the Spring acts, occurring simultaneously with the adjustment of spring force, is already shown.
DE 39 11 854 A1 discloses a control device for the contact pressure of a bobbin in which the bobbin arm supporting the bobbin attaches by means of a pneumatic cylinder. In this device an optimal contact pressure is determined as a function of the diameter of the bobbin, whereby the contact pressure control device maintains a pre-set contact pressure correction curve, whereby a drive mechanism of the bobbin holder is controlled via the momentary bobbin diameter. For this purpose the ratio of the bobbin's speed of rotation and that of the drive roller is detected to calculate the take-up bobbin diameter and the driving mechanism of the bobbin arm is control
REFERENCES:
patent: 2196000 (1940-04-01), Richardson
patent: 3430875 (1969-03-01), Kieronski
patent: 3845911 (1974-11-01), Wyatt
patent: 3991950 (1976-11-01), Tashiro et al.
patent: 4102506 (1978-07-01), Raasch et al.
patent: 4140286 (1979-02-01), Lattion
patent: 4342429 (1982-08-01), Katoh et al.
Fahmuller Maximilian
Meier Thomas-Georg
Jillions John M.
Mansen Michael R.
Rieter Ingolstadt Spinnereimaschinenbau AG
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