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 heald rods, it can be divided into: heald frames in which the heald rods are directly fixed on the beam (referred to as conjoined heald frames); heald frames in which the heald rods are fixed on the beams with brackets. (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) ≤ 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 during high-speed movement 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 based on 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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