| 摘要 |
A device for shed-forming vertical displacement of horizontal warp threads (1, 2) in a loom has a horizontal upper plate (3) and a horizontal lower plate (4) positioned below the upper one. A drive member (8) is arranged to cyclically displace the plates (3, 4) vertically relative to one another between a first position, in which the plates are located at a predetermined minimum distance from one another, and a second position, in which they are located at a predetermined maximum distance from one another. A number of vertically movable warp thread lifters (34) are arranged between the plates and, by means of a heddle cord (35) which extends through the upper plate (3), are each connected to a respective warp thread (1, 2) so as to displace the warp threads during vertical movement and form a shed (38) between them. Each warp thread lifter (34) is arranged to interact with the plates (3, 4) in such a manner that, when the plates are located in said first position, it is by magnetic action attracted and attached to one or the other plate according to a predetermined order depending on the pattern to be woven, so as then, during a cycle, to be carried along in the displacement of this plate relative to the other plate. Electromagnetic members (32, 33) are arranged to control in their active state, by means of regulated current supply, the magnetic attraction according to said order. |
