Textiles: weaving – Warp manipulation – Shedding
Patent
1991-07-29
1993-01-05
Falik, Andrew M.
Textiles: weaving
Warp manipulation
Shedding
139 65, D03C 320
Patent
active
051761866
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a heald rod retention system for use with an electronic jacquard system.
BACKGROUND OF THE INVENTION
In our European patents 0119787 and 0188074 (U.S. Pat. Nos. 4,593,723 and 4,667,704), we describe heald rod retention devices which act upon deflectable heald rods. The heald rod retention devices include electromagnets which on activation act to deflect a heald rod and cause it to engage with a latch for retention.
SUMMARY OF THE INVENTION
It is a general aim of the present invention to provide a similar heald rod retention device which utilises nonmechanical means for deflecting the heald rod and which utilises the electromagnet to retain a deflected heald rod in its deflected position and which does not rely upon a mechanical operation for deflecting the heald rod to its deflected position for retention by the electromagnet.
In accordance with the present invention deflection of the heald rod to its deflected position is caused by the presence of a permanent magnetic field. The permanent magnetic field may be created by permanent magnets arranged on the body of the heald retention device and/or the heald rod and may be arranged to cause deflection by reason of magnetic attraction or magnetic repulsion.
According to one aspect of the present invention there is provided a heald control system including a heald rod which is reciprocated along its longitudinal axis, the heald rod having a resiliently deflectable body portion formed from a magnetically attractable material, a retention latch formation on the body portion, the retention latch formation during reciprocation of the heald rod being moved along a path of travel between first and second limits of reciprocal movement, said path of travel having a first zone of movement wherein the body portion travels in an undeflected position and a second zone of movement wherein the body portion travels in a deflected position, permanent magnetic means operable on the body portion during reciprocable movement of the heald rod to cause the body portion to move from the non-deflected position to the deflected position, fixed latch means located to one side of the first zone of the path of travel and arranged to engage the latch formation on the body portion only when the body portion is in said deflected position, and an electromagnet located adjacent said path of travel so that the body portion is located in the vicinity of the electromagnet when in its deflected position, the electromagnet when energised being capable of holding the body portion in the deflected position as the latch formation moves from the second zone and into the first zone of travel and thereby cause the latch formation to engage the fixed latch means.
BRIEF DESCRIPTION OF THE DRAWINGS
Various aspects of the present invention are hereinafter described with reference to the accompanying drawings, in which:
FIG. 1 is a schematic illustration showing a first embodiment of the present invention
FIG. 2 is a schematic illustration showing a second embodiment according to the present invention
FIG. 3 is a schematic illustration showing a third embodiment according to the present invention
FIG. 4 is a schematic illustration showing a first permanent magnet arrangement for incorporation into the embodiment shown in FIG. 3
FIG. 5 is a schematic illustration showing a second permanent magnet arrangement for incorporation into the embodiment shown in FIG. 3
FIG. 6 is a schematic illustration showing a fourth embodiment according to the present invention
FIG. 7 is a more detailed view of a fifth embodiment according to the present invention
FIG. 8 is a front view of a heald rod according to the present invention
FIG. 9 is a side view of the heald rod shown in FIG. 8
FIG. 10 is a diagrammatic representation illustrating the general principal of operation of a system according to the present invention
DESCRIPTION OF THE PREFERRED EMBODIMENT
The type of heald rod retention system with which the present invention is concerned with is describ
REFERENCES:
patent: 4593723 (1986-06-01), Griffith
patent: 4667704 (1987-05-01), Griffith
patent: 4936357 (1990-06-01), Keim et al.
Bousfield Alan
Mahboubian-Jones Gawayne
Bonas Machine Company Limited
Falik Andrew M.
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