Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1999-04-29
2000-08-01
Falik, Andy
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
2423654, D03D 4734, B65H 5122
Patent
active
060951990
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a yarn feeder including a housing and a storage drum supported thereon, and a yarn withdrawal brake having a carrier ring which is axially shiftable within a predetermined clearance to vary braking effects on the yarn as same is withdrawn from the storage drum.
BACKGROUND OF THE INVENTION
In a yarn feeder of this kind as known from WO95/20700, the carrier ring can be moved reciprocally by means of shift drives forwards and backwards exclusively over one and the same travel stroke within the axial clearance in the holder. Since the holder can be adjusted in the bracket in the axial direction, the braking effect between the braking body and the yarn withdrawal region of the storage drum can also be adjusted, either when the carrier ring abuts at an axial counter stop or the carrier ring abuts the opposite axial counter stop. However, the travel stroke of the carrier ring cannot be varied by this adjustment, i.e. the difference between the braking effect in both abutting positions. It is disclosed to adjust the travel stroke of the carrier ring between its axial counter stops of the holder by inserting or removing disc washers from an axial counter stop intended for one moving direction of the carrier ring in the housing. However, this is time-consuming and necessitates a partial disassembly in the region of the holder.
It is an object of the invention to improve a yarn feeder of this kind such that the travel stroke of the carrier ring within the predetermined axial clearance in the holder can be varied comfortably and rapidly in order to vary the difference between the braking effects in both end positions of the carrier ring in addition to the already possible adjustment of the holder.
The above object can be achieved by providing a yarn feeder with a carrier ring which is axially shiftable in a ring-shaped holder within a predetermined clearance defined by counter stops of the holder. Further, at least one pair of shift drives are provided on the holder for axially shifting the carrier ring between the counter stops, and the carrier ring defines thereon at least one travel stroke adjustment ramp for adjusting the stroke of the carrier ring within the predetermined clearance. The carrier ring is rotatable relative to holder so as to align the ramp with a first of the counter stops which faces the ramp facing counter stop.
By rotating the carrier ring in said holder, the travel stroke of the carrier ring can be varied simply and rapidly between its end positions, since the first axial counter stop of the holder is then in a co-operating position.
In one embodiment, an additional axial counter stop is provided, which also co-operates with a travel stroke adjustment ramp in order to create another adjustment possibility for the travel stroke of the carrier ring in the holder.
According to another embodiment, the axial side surface of the carrier ring or the plane of the axial side surface of the carrier ring may itself form a travel stroke adjustment ramp within the ramp group.
Several travel stroke adjustment ramp groups may be distributed over the circumference of the carrier ring in order to guarantee a stable support of the carrier ring.
A particularly advantageous embodiment includes housings located at a removal opening of the holder, which housings form the first axial counter stop which may be selectively brought into co-operation with the travel stroke adjustment ramps of each group.
In another embodiment, at both axial side surfaces of the carrier ring, groups of travel stroke adjustment ramps are provided, and groups of counter stops are provided at both axial sides of the holder. In this way, a plurality of adjustment possibilities for the travel stroke of the carrier ring are achieved.
In yet another embodiment, three travel stroke adjustment ramps are provided which satisfy in practice all requirements regarding the variation of the travel stroke of the carrier ring.
In still another embodiment, the carrier ring can be comfortably rotat
REFERENCES:
patent: 5181544 (1993-01-01), Deiuri
patent: 5553641 (1996-09-01), Zenoni
patent: 5778943 (1998-07-01), Tholander
Falik Andy
Iro AB
LandOfFree
Yarn feeder including an adjustable carrier ring for varying bra 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 including an adjustable carrier ring for varying bra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Yarn feeder including an adjustable carrier ring for varying bra will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-654462