Patent Application
20050284532
1. Field of the Invention
The present invention relates to a heald, especially to a lifting heald as a part of a leno selvedge device, said heald comprising a head portion and a base portion with a closed or an open eyelet for mounting to a heald frame or to a heald ridge bar, said head portion and/or base portion being adapted to be secured stationarily to the heald frame or the heald ridge bar. As used herein, the term “open eyelet” is to be construed as a slot for example.
2. Description of the Prior Art
Various healds are known in the weaving trade. Lifting healds are more specifically known to be part of a leno selvedge device, in which one half heald is alternately carried along by the lifting healds to form the leno selvedge. In the region of its upper crosspiece, the half heald comprises an eyelet for receiving the stationary thread, a leno thread being guided between half heald and lifting heald, said leno thread passing at each change of shed from one side of the half heald to the other side of said half heald for forming the leno weave (DE 39 12 733 C1).
To facilitate mounting of the lifting healds to the heald frames or to the heald ridge bars receiving the lifting healds, it is already known to provide the head portion of such a lifting heald with a pivotal bracket (EP 0 344 428 A1). At the opposite end of the lifting heald, that is, on the base portion, there is provided an opening for receiving the other heald frame or the other opposite heald ridge bar. By attaching the lifting healds in this manner to the heald ridge bars or to the heald frames, the healds are not prevented from moving laterally on the heald ridge bars or the heald frames.
What are termed mini leno selvedge apparatus are moreover known, which can also be utilized in particular in the center of the fabric, e.g., when the fabric is divided in its center, or in the dent bar when multiple webs are being woven. Such type mini leno selvedge apparatus possess heald ridge bars in the form of a finger-shaped extension, the length of said finger-shaped extension corresponding at the most to the width of the head portion or of the base portion of the heald so that the outer edge of the head portion or of the base portion is flush with the front-side end of the heald ridge bar. This is necessary because the warp yarn glides along the heald. If the end of the heald ridge bar projects beyond the width of the heald, this would impair the travel of the warp yarn along the heald.
To fix the heald on the heald ridge bar, it is now known to screw the heald to the lifting heald in the region of its head portion or of its base portion. This means that the head portion for example comprises a through hole that is oriented axially parallel with a corresponding hole in the heald ridge bar so that the heald is fixable to the heald ridge bar by means of an M2 screw. Screws larger than M2 cannot be utilized since the size of the head portion or of the base portion of the heald forbids the use of larger screws. Manipulation of an M2 screw is very complicated as such a screw gets easily lost and is also very difficult to manipulate by hands.
It is the object of the invention to form a heald of the type mentioned herein above in such a manner that it can be readily secured to the heald frame or a heald ridge bar by means of captive parts and by toolless mounting.
In accordance with the invention, this object is solved by having the head portion and/or the base portion adapted to be interlockingly, more specifically non-slidably, fixed to the heald frame or to the heald ridge bar by means of a detent system. Accordingly, the heald, more specifically the lifting heald, is snap-fitted onto the heald ridge bar. Mounting is much easier this way than if small screws are to be cumbersomely inserted and screwed into small openings whereby it is further possible that access be restricted during mounting.
Advantageous features of the invention are described in the subordinate claims.
There is more specifically provided that the eyelet of the head portion and/or of the base portion of the heald corresponds approximately to the cross section of the heald frame or of the heald ridge bar, with the detent system including a detent lug or knob that is directed toward the heald frame or the heald ridge bar and is adapted for insertion into a mating detent opening of the heald frame or of the heald ridge bar. Healds, and more specifically lifting healds, are substantially made from a plastic material. Such plastic materials have a certain inherent elasticity so that the detent lug is pressed into the mating opening in the heald frame or in the heald ridge bar in the region of its head portion or of its base portion by the very inherent elasticity of the plastic material. In order to prevent the detent lug from inadvertently slipping out of the detent opening as a result of the vibrations occurring during operation of the weaving machine, there is provided, according to another feature, that a resilient tongue be disposed in the wall of the eyelet facing the detent lug, said tongue pushing the detent lug into, or pulling it out of, the detent opening, that is to say that the tongue projects into the eyelet when not mounted to the heald ridge bar.
According to another feature, the head portion and/or the base portion comprises a magnet located behind the knob or the detent lug. Accordingly, the magnet is in the immediate neighbourhood of the heald ridge bar or of the heald frame. The heald ridge bar in particular is made from metal so that, thanks to the magnetic force it exerts onto the heald ridge bar, the magnet prevents the knob or the detent lug from slipping out of the detent opening. This means that the detent lug is pulled into the detent opening by the magnetic force.
In accordance with another feature, the resilient tongue itself additionally comprises another knob so that the ridge bar is taken hold of from two sides in a tongs-like fashion with the knobs or the detent lugs engaging the detent openings from two sides.
The invention will be understood better upon reading the exemplary description accompanying the drawing.
The heald, which is indicated generally at 1, comprises a head portion 2 and a base portion 3. The base portion 2 possesses an eyelet labelled at 10 in the form of a slot or an opening. The latter needs not be closed at the top, as one would expect an “eyelet” to be. Inasmuch, it may be an open eyelet. In the mounted state of the lifting heald, the eyelet 10 has two vertical walls 10a and 10b, a knob 11 being provided on, and associated with, the wall 10a of the eyelet 10. In the region of the wall 10b of the eyelet 10 there is the resilient tongue 12. The resilient tongue 12 projects into the eyelet 10. The resilient tongue 12 causes the detent lug or the knob 11 to be pushed or pulled into the detent opening 13a of the heald ridge bar 13 (
Parallel to the eyelet 10, an opening 20 into which a magnet is inserted may be provided in the head portion of the lifting heald, said opening serving to accommodate a magnet 21 that additionally ensures that the detent opening 13a of the heald ridge bar is pressed against the knob 11.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102004030913.2-26 | Jun 2004 | DE | national |
