Textiles: weaving – Warp manipulation – Shedding
Patent
1997-06-20
1998-10-06
Falik, Andy
Textiles: weaving
Warp manipulation
Shedding
139 93, D03C 900
Patent
active
058162941
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention concerns a weaving machine or a shaft device.
2. State of the Art
Shaft devices of the kind used with weaving machines are known in various configurations. An example of such a device is known from the Swiss document CH-PS 523 987, which is described in more detail in the accompanying FIGS. 1-4. The known shaft devices require a relatively large amount of play between a driving heddle slide bar and the end eyelet of a heddle to ensure a sufficiently large spread or separation angle for the handling and manipulation of the heddles. Such a large amount of play causes, on the one hand, wear, and, on the other hand, a high noise level. Such shaft devices or weaving machines equipped with them therefore allow for a maximum speed of 2,500 r.p.m.
SUMMARY OF THE INVENTION
It is the object of the invention to improve a shaft device of the above mentioned kind so that the indicated drawbacks can be eliminated.
Accordingly, so that the drive for a heddle is produced by means of at least one thin leg on the heddle driving slide bar, the leg being transverse to the plane formed by the slide bar, the leg engages a receiving groove of the associated end eyelet of the heddle with minimal free play. Even at maximum speed, for instance 4,000-6,000 cycles per minute, this utterly small play generates only a very reduced noise and causes only minimal wear. This novel shaft device or weaving machine equipped with such a device therefore yields a better driving performance with comparatively lower noise level and reduced wear.
It is possible to improve the life of the shaft device through a pair of legs engaging corresponding grooves in the eyelet of the heddle, since in this case the driving force is distributed over two legs. Wear is reduced at the same time, and so is noise level which usually worsens with the increasing wear.
In principle, it is possible to arrange the leg of the driving heddle slide bar at any height of the driving heddle slide bar, preferably the side of the bar facing the thread eyelet.
With regard to the design and alignment of the legs, there are several possibilities. The configuration with the leg arranged parallel to the plane of the warp thread allows for the most favorable distribution of forces.
A configuration of the slide bars, in particular of the driving heddle slide bar, is specifically advantageous when the bar has an L-, C- or T-shaped cross section. Profiling, that is sectioning, enables firstly the forming of the leg and ensures, secondly, a good flexural moment of inertia with low mass in comparison to a full profile of the slide bar. The lower mass of the slide bars favors higher operative speeds and contributes to the reduction of noise and wear.
In principle, the end eyelets can have an opening at the one side transverse to the direction of motion. More preferable, however, is the configuration in which the eyelet circumscribes the heddle driving slide bar.
An advantageous amount of play is 0.01-0.1 mm. An advantageous width of the driving groove is 1.0 mm. An estimation of advantageous vertical play between the end eyelet and the idle slide bar to ensure a separation angle required for the handling of the heddles is 0.5-10 mm.
In principle the heddle may have any configuration, but a laminated configuration is of a special advantage. It allows for good tensile and wear properties with a minimum need for lateral spaces.
Especially advantageous is a configuration wherein two assembly openings generally are present. This allows for a further use of an assembly unit. The assembly unit facilitates the procedural installment of heddles with warp threads. The heddles can then be mounted on and dismantled from the slide bars by means of the assembly unit. The assembly and disassembly times can therefore be substantially reduced when, for example, shifting the article to be manufactured.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail in conjunction with the exa
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patent: 3058495 (1962-10-01), Kaufmann
patent: 4342339 (1982-08-01), Koch
patent: 4492256 (1985-01-01), Kramer
patent: 4790357 (1988-12-01), Kramer
patent: 5176183 (1993-01-01), Koch
patent: 5178192 (1993-01-01), Koch
Falik Andy
Textilma AG
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