Textiles: weaving – Warp manipulation – Shedding
Patent
1992-11-05
1994-05-10
Falik, Andrew M.
Textiles: weaving
Warp manipulation
Shedding
D03C 320
Patent
active
053099524
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a shedding device.
A device of this kind is disclosed in the U.S. Pat. No. 4,969,490. In this device the pulling element comprises a supporting heel, which is taken up in the lower shed position by a groove shaped recess of a stationary supporting ledge.
A relatively large distance is present between the electromagnet and the pulling element, such that the pulling element must be pivoted forcefully by the lifting blade toward the electromagnet and must be pivoted back when the electromagnet is not excited by the complete harness string. During this continuous pivoting back and forth of the pulling element, noise is generated and friction occurs on the one hand between the pulling element and the supporting heel and on the other hand between the pulling element and the lifting blade. Such friction leads to the wearing of one or the other or both parts and thus is a serious structural and functional drawback. A further weak point consists in that the restoring force of the pulling element must be produced by the complete harness string. Because the frictional force between the supporting ledge and the supporting heel counteracts same, the complete harness string must be tensioned stronger than necessary.
SUMMARY OF THE INVENTION
Object of the present invention is to provide a shedding device, in which this drawback is eliminated to a large extent and which allows a design having an extremely low mass.
Another object of the present invention is to provide a shedding device which is developed further in such a manner that the drawbacks of known devices are eliminated and oscillations generated by the insertion operation are low which thereby reduces the pulling back force of the complete harness string.
The advantages gained by the invention are to be seen substantially in that operation are low movement is prevented and that therewith is made possible and and tackle devices, cords and slickensides is arrived at.
There is shown in
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a first embodiment of an inventive insertion device,
FIG. 2 a section along line II--II in FIG. 1,
FIG. 3 is a perspective of a second embodiment of an inventive insertion device, and
FIGS. 4-13 are diagrammatic views of further embodiments of an inventive shedding device.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A shedding device of the design here under consideration includes a kinematic connecting member 1, which interconnects pulling elements, a pulley block 2 with a first disk 3, around which the connecting member 1 is guided, and a second pulley 4, which is connected to the first disk 3 via web parts 5, a cord 6, which is guided around the second disk 4 and is connected to the heddle 7 for the guiding of warp threads and a restoring spring 8, which is mounted to the end of the heddle 7. The other end of the cord 6 is connected to the machine frame.
The shedding device includes, furthermore, two lifting blades, which are oppositely moveable upwards and downwards, two pulling elements, which are moveable upwards and downwards between a lower and an upper shed position and an electrically controllable magnetic insertion device with a control device.
The lifting blades, pulling elements and the retention device will be described in detail based on the appended drawings for the inventive embodiments of shedding devices.
In FIGS. 1 and 2 a first embodiment of an retention device is illustrated. This insertion device 12 includes two electromagnets 13, 14 and two pole plates 15, 16 and a holder 17, as well. Each electromagnet consists of a cylindrical core 18 and a winding 19, which is wound on the core (FIG. 2).
Each pole plate 15, 16 has a U-shaped cross section, which decreases along the length of the pole plate, such that the legs 20, 21 form inclined surfaces. The pole plates 15, 16 are arranged in such a manner, that the ends of the legs are at a distance oppositely of each other. The electromagnets 13, 14 are located between the pole plates 15,
REFERENCES:
patent: 4593723 (1986-06-01), Griffith
patent: 4667704 (1987-05-01), Griffith
patent: 4936357 (1990-06-01), Keim et al.
patent: 4969490 (1990-11-01), Seiler
International Search Report dated Jun. 22, 1992.
Falik Andrew M.
Textilma AG
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