Overview
ISO 10787-2:1994 - "Textile machinery and accessories - Heald frames - Part 2: Heald-carrying rod fixed directly on the frame stave - Coordinated dimensions" specifies the coordinated dimensional system for heald frames where the heald-carrying rod is fixed directly to the frame stave. The standard gives defined dimensions, tolerances and connection details (illustrated in Figures 1–4 and tabulated in Tables 1–2) to ensure interchangeability and mechanical compatibility in weaving machinery.
Key topics and requirements
- Coordinated dimensions: Dimension tables (Table 1 and Table 2) specify nominal sizes for frame staves, lateral supports, pitch (t) of the harness, working width (e), and related elements.
- Pitch (t) definition: The pitch is the distance between midpoints of adjacent heald frames in a harness - normally equal to the pitch of the shedding motion.
- Heald-carrying rod sizes: Recommended rod cross-sections appear in the standard (e.g., 22 mm × 1.7 mm suitable for C-shaped end loops; 16 mm × 2.1 mm suitable for J-shaped end loops).
- Frame connections: Detailed upper and lower frame-stave connections are shown (Figures 3–4) and dimensioned in Table 2; values reference machine-specific parameters where applicable (e.g., a variable v fixed by the machine manufacturer).
- Tolerances: Linear and angular tolerances follow ISO 2768‑1 (tolerance class fine) as referenced.
- Scope limits: Applies specifically to heald frames with rods fixed directly on the stave (Part 2 of ISO 10787); other configurations are covered in Part 1 (rod supported by a rod support) and Part 3 (guides).
Practical applications and users
Who uses ISO 10787-2:
- Textile machinery manufacturers and designers specifying weaving machine components.
- Equipment purchasers and procurement engineers who need assured interchangeability.
- Component suppliers (healds, rods, frame staves) and retrofit specialists.
- Quality and standards engineers performing design verification and conformity checks.
Practical uses:
- Standardizing heald frame dimensions across different machine models to simplify spare parts and maintenance.
- Ensuring correct mating of healds (C- or J-shaped end loops) with heald-carrying rods.
- Defining mounting and connection geometry for upper/lower frame staves to avoid assembly issues.
- Supporting technical specifications in tenders and procurement documents.
Related standards
Keywords: ISO 10787-2:1994, heald frames, heald-carrying rod, frame stave, coordinated dimensions, textile machinery, harness pitch, heald frame connections.