Types and technical requirements of heald frames
1. Types of heald frames
(1) According to the type of loom: heald frames for air-jet looms; heald frames for water-jet looms; heald frames for rapier looms; heald frames for projectile looms heald frame.
(2) According to the fixing form of the heald frame and the heald rod, it is divided into: the heald frame in which the heald rod is directly fixed on the beam (referred to as the one-piece heald frame); the heald frame in which the heald rod is fixed on the beam with a bracket (referred to as split heald frame).
2. Technical requirements for heald frames
(1) The flatness of the heald frame is ≤1mm.
(2) The verticality of the heald frame (the gap between the side rails and the standard square) is ≤1mm.
(3) The drive hook of the heald frame should be firmly fixed on the beam or side rail to ensure that the drive hook does not loosen or fall off.
(4) The connection of the heald frame must be firm to ensure that the heald frame does not fall apart after being loaded with various tensions at high speed and can operate normally.
(5) The beams of the heald frame must be straight and strong, with a tensile strength σb ≥ 240MPa. The cross-sectional size of the beam is selected according to the loom, fabric and other parameters to ensure that it has sufficient strength. Commonly used cross-sections include conjoined beams and split beams. The main dimensions are shown in Table 5-1 and Table 5-2.
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