Textiles: weaving – Warp manipulation – Shedding
Patent
1990-06-05
1991-07-09
Falik, Andrew M.
Textiles: weaving
Warp manipulation
Shedding
335234, D03C 100, H01F 714
Patent
active
050296183
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a control device for textile machinery, more particularly a control device for a dobby.
In the modern dobbies the weaving pattern in form of electrical signals is converted into mechanical control commands The interface between the electronics and the mechanics should contain as few elements as possible elements and have a high longevity at a high switching sequence.
Known control devices (see for instance French patent FR 81 21 106) use a cam driven mechanism which drives the electromagnet armature for the selection of the YES/NO of the control command onto the yoke of the magnet, whereby the electromagnet must provide the holding force for the magnet armature which is subjected to a spring force. Aside from the cam driven mechanics for the movement of the magnet armature and the electromagnet tension and/or pressure springs such control systems also include further mechanical elements such as pawls, and levers with corresponding glide surfaces which are necessary for mechanical force amplification. If the electromagnet is to attract the magnet armature for its control function without a mechanical aid, this magnet to provide corresponding power, will become large in structural and electrical dimensions as well, due to which the switching time grows longer due to the large mass of the armature, which detrimentally influences the performance of the dobby. The named mechanical parts are a subjected to wear, are cause of noise and vibrations, and lessen the disturbance free function of the dobby over a prolonged length of operation.
The invention is based on the object of reducing the plurality of the parts necessary for the controlling of a dobby, to increase the ease of maintenance, and to attain smooth running even at high revolutions.
SUMMARY OF THE INVENTION
This object is met in accordance with the invention in that a specific combination of high performance permanent magnets and electro-magnets is provides, along with a correspondingly selected magnet armature shape for reaching of the necessary working capacity for the controlling of mechanical switching operations with a minimum of mechanics. The advantages gained by the invention consist specifically in that a change of the position of the magnet armature is attained by very short electrical control impulses in a magnet coil, whereby a force impulse of a high intensity is generated during the change of the position of the magnet armature, and this force impulse is utilized for direct control of the dobby. The magnet armature is arrested at each end position without feeding electrical energy by utilizing the permanent magnet flux of the permanent magnets.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention are illustrated in the drawings and will be described hereinbelow in closer detail.
There is illustrated in:
FIG. 1 is a schematic view showing a control device in accordance with the present invention, the device having a tilting armature suitable, for example, for controlling a dobby in a textile machine.
FIG. 2 is a schematic view showing another embodiment of a control device in accordance with the present invention, the control device having a linearly shiftable armature and showing a permanent magnet flux path provided by a pair of permanent magnets.
FIG. 3 is a schematic view similar to FIG. 2 showing an electromagnetic flux path superimposed on the permanent magnet flux path.
FIG. 4 is a schematic view similar to FIG. 2 showing the armature linearly shifted in position from the position shown in FIG. 1.
FIG. 5 is a schematic view similar to FIG. 2 showing another embodiment of a control device in accordance with the present invention, the device having permanent magnets that are asymmetrically positioned.
FIG. 6 is a schematic view similar to FIG. 2 showing adjustable armature abutments.
FIG. 7 is a schematic view of an embodiment similar to the embodiment shown in FIG. 1 and having a tilting armature.
FIG. 8 is a schematic view of another embo
REFERENCES:
patent: 3987383 (1976-10-01), Antonitsch
patent: 4437078 (1984-03-01), Bando et al.
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