Winding – tensioning – or guiding – Unidirectional winding and unwinding – Threading
Patent
1998-04-17
1999-09-07
Mansen, Michael
Winding, tensioning, or guiding
Unidirectional winding and unwinding
Threading
2423654, 139452, B65H 5100, D03D 4736
Patent
active
059474033
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a yarn feeding device having a longitudinally movable braking body holder.
BACKGROUND OF THE INVENTION
In a yarn feeding device known from EP 0 567 045 A1, the holder is secured to a slide which is movable along the extension arm. The slide is coupled to an adjusting screw arranged in longitudinally positioned fashion in the extension arm, namely by means of a pin which is seated in the slide at the bottom and which can be lifted by means of an eccentric and a handle to decouple the slide from the adjusting screw. The slide can then be moved by hand on the extension arm into the gap position or removed from the extension arm. In the engaged state of the pin, the slide can also be moved gradually by means of the adjusting screw into the gap position. The gap position is needed to either replace the yarn braking body or the yarn braking element or to thread a new yarn, possibly by hand. The adjustment of the holder by means of the adjusting screw is time-consuming and troublesome. A manual adjustment requires considerable skill for coupling the pin and for adjusting the slide.
In a yarn feeding device known from EP 0 659 918 A1, the holder can be moved by remote control into the gap position by means of a compressed-air cylinder-piston unit. A new yarn is threaded pneumatically by blowing the yarn below the lifted yarn braking element therethrough. Since the piston is acted upon by a restoring spring, there is the risk in case of a manual threading operation or when the yarn braking element or yarn braking body is replaced that the holder will automatically return towards the braking position. Moreover, this is an expensive and troublesome solution which is not suited for a yarn feeding device with manual threading.
SUMMARY OF THE INVENTION
It is the object of the present invention to improve a yarn feeding device of the above-mentioned type in a constructionally simple manner such that the holder can be moved comfortably and rapidly into the gap position and manual threading and/or the replacement of the yarn braking body or the yarn braking element is/are possible without any time limits.
This object is achieved by a yarn feeding device as defined in the appended claims.
The present invention is based on the following concept.
In cases where a new yarn must be threaded by hand or the yarn braking element must be replaced, the operator can bring the holder by means of the quick adjustment mechanism into the gap position in one stroke and thus at a rapid pace, and he can then perform the threading or replacement operation without any time limits. The quick adjustment mechanism may be of a simple constructional type and can be accommodated in a space-saving manner, with the handle of said mechanism being adapted to be positioned at an optimum place to ensure an operation which is as comfortable as possible, even in cases where a plurality of yarn feeding devices including accessories are to be grouped on a textile machine in closely adjacent relationship.
In a convenient embodiment, the gap position can easily be established and eliminated again in one operation. The handle is suitably positioned and arranged such that it does not get in the way in the braking position and is optionally largely hidden, whereas it projects in the gap position in a clearly conspicuous manner and is an indication that the gap position must again be eliminated prior to any further use of the yarn feeding device.
Depending on the configuration of the yarn feeding device, and the arrangement in groups of a plurality of cooperating yarn feeding devices, and also under ergonomic aspects, the mechanism or the handle may be accessible at or on the free end of the extension arm, in the course of the extension arm, or even on the housing of the yarn feeding device. It is even possible to construct the quick adjustment mechanism such that it can be selectively operated from the one or the other position of the feeding device, i.e., to provide more than one handle to ensure optimum operating convenien
REFERENCES:
patent: 4429723 (1984-02-01), Maroino
patent: 4926912 (1990-05-01), Zenoni
patent: 5409043 (1995-04-01), Zenoni et al.
patent: 5553641 (1996-09-01), Zenoni
patent: 5778943 (1998-07-01), Tholander
Bergman Thomas
Johansson Egon
Tholander Lars Helge Gottfrid
Iro AB
Mansen Michael
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