Yarn feeder

Details Yarn feeder Yarn feeder

1998-07-16

2000-07-04

Mansen, Michael R.

Winding, tensioning, or guiding

Unidirectional winding and unwinding

Variable number of windings on support

139452, B65H 5120, D03D 4736

Patent

active

060826541

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a yarn feeder having a movable yarn braking body for braking yarn.


BACKGROUND OF THE INVENTION

In a yarn feeder which is known from EP 0 446 447 A1, the support body is a movable slide which is movable in the extension arm by means of a compressed-air/cylinder/piston unit. A spring is accommodated in the cylinder and acts on the piston in a direction opposite to the compressed-air action. The piston rod is coupled via a hinge to an adjusting screw which has fixed thereon the movable slide which is supported in the guide tracks of the extension arm and separated from the piston. The movable slide guides the holder of the yarn braking body which is adjustable by means of an adjusting screw relative to the movable slide. Great constructional efforts are required for guiding the movable slide in the extension arm and the holder on the movable slide. The strong soiling caused by depositing yarn material, the relatively great reactive forces of the support of the yarn braking body on the storage body, which slightly vibrates during operation, unavoidable wear in the various guide tracks, the multipart structure of the holding device and the necessity of an easy adjustability of the yarn braking body with an exactly reproducible braking position might lead to problems because of which the gap position and/or the braking position cannot be adjusted in the predetermined manner. Furthermore, the versatile holding device requires considerable constructional space.
It is the object of the present invention to provide a yarn feeder of the above-mentioned type in which the holding device is simple under manufacturing and assembling aspects and is only composed of a few parts and can guarantee the predetermined position of the yarn braking body in a reliable manner in the case of both frequent and rare adjusting operations.


SUMMARY OF THE INVENTION

This object is achieved by the yarn feeder of the invention which includes a guide on one of a piston and a support body and a guide track on an extension arm.
The holding device is simple under manufacturing (industrial scale manufacture) and assembling aspects and is robust during operation. It is only composed of a few parts and requires relatively litte constructional space (compact design). There is a very stable and exact guiding and positioning of the yarn braking body by the piston and by the guide nose which acts as a rotation preventing means, with the reaction forces being transmitted over a large surface and over a considerable length and with advantageous lever arms into the extension arm. The yarn braking body can be easily adjusted over long service lives. Predetermined positions of the yarn braking body are reliably reached at frequent and rare adjustment cycles. The holding device can be used in a universal manner and without any significant modifications in yarn feeders in which an automatic adjustment (action on the piston by compressed air) takes place for yarn threading and for changing the yarn braking body, and also in yarn feeders in which only a manual adjustment is desired. In the manually operated version the piston has a dominant guiding function, the guide portion of the piston in the cylinder being well protected against soiling, while the piston in the automatic version additionally assumes a drive function. It may be provided with one or several seals, if necessary. However, it is also possible to use material combinations with self-lubricating properties, e.g. a Teflon cover of the piston and/or the cylinder. The piston forms a unit with the support body with respect to stable guidance and mounting of the yarn braking body. Nevertheless, it might happen that the piston must be produced as a separate component and fixedly connected to the support body.
Production is simplified and there is an exact guiding of the yarn braking body thanks to an integral design of the cylinder in the extension arm.
The embodiment where an integrally molded member defines the piston and support body is

REFERENCES:
patent: 4429723 (1984-02-01), Maroino
patent: 4926912 (1990-05-01), Zenoni
patent: 5123455 (1992-06-01), Maina
patent: 5181544 (1993-01-01), Deliuri
patent: 5316051 (1994-05-01), Zenoni et al.
patent: 5647404 (1997-07-01), Maina et al.
patent: 5778943 (1998-07-01), Tholander

Affiliated with

Also associated with

Rating

Yarn feeder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Yarn feeder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Yarn feeder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1478746