Textiles: weaving – Warp manipulation – Shedding
Patent
1991-07-08
1992-07-28
Falik, Andrew M.
Textiles: weaving
Warp manipulation
Shedding
139 65, D03C 308, D03C 320
Patent
active
051333899
DESCRIPTION:
BRIEF SUMMARY
Heald control devices for weaving machines, in which the movement of individual or groups of healds is controlled by an electrical signal are already known. One such heald control device is described in our UK Patent 2047755.
It is a general aim of the present invention to provide an improved heald control system which requires less electrical power to effect selection and can also be more compact.
According to 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 mounted 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 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, fixed cam means engagable with cam means on said body portion during reciprocal movement of the heald rod to cause the body portion to move from the non-deflected 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 it is 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.
Reference is now made to the accompanying drawings in which:
FIG. 1 illustrates the principle of operation of heald rod selection according to the present invention;
FIG. 2 shows a heald rod according to a first embodiment of the present invention in detail;
FIG. 3 is an elevation view of an assembly of heald control devices according to a first embodiment of the present invention;
FIG. 4 shows the construction of an electromagnet for use in the heald control device of the present invention;
FIG. 5 illustrates the operation of the top of a heald rod at the top of its travel;
FIG. 6 is an elevation view similar to FIG. 3 showing heald control devices according to a second embodiment of the present invention;
FIG. 7 is a side view of the embodiment shown in FIG. 6;
FIG. 8 is an elevational view of a heald rod as used in the embodiment illustrated in FIG. 6;
FIG. 9 is a side view of the heald rod shown in FIG. 8.
The method by which the healds are lifted is similar to that described in UK Patent No. 2047755. For example, as shown in FIG. 1, healds (not shown) are attached to a lifting cord 1 which passes over a pulley wheel 2 to a fixing on the jacquard frame 3. Pulley 2 is attached to a second pulley wheel 3 via a housing 4 such that both wheels can rotate but are in fixed relationship to each other.
A second cord 5 which passes round wheel 3 connects two heald rods 6 and 7. These heald rods are raised and lowered alternately by knives 8 and 9 which press against knife hooks or abutments 10.
The heald rods include a resiliently deflectable body portion 15a formed from a magnetically attractable material on which is mounted latches, preferably in the form of hooks 11 which the heald control device causes to be either held or not by a fixed latch stop 12.
The sequence of operation of the hooks is described in Patent Nos. UK 2047755 and European 84301486.1 as are the knife drive means and the method of mounting and arranging the heald control devices.
The general principle of the operation will now be described with reference to FIG. 1.
The latches 11 are each reciprocated along a path of travel between a first or lower limit LL and a second or upper limit UL.
REFERENCES:
patent: 4022251 (1977-05-01), Bucher
patent: 4041987 (1977-08-01), Bucher
patent: 4936357 (1990-06-01), Keim et al.
Bonas Machine Company Limited
Falik Andrew M.
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