Drafting Unit
AssemblyThe three- or four-line roller drafting unit, one per spindle, that pulls the heavy sliver out to roving fineness, with a double-apron middle zone that controls the floating fibers through the long high draft. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Bill of materials for Drafting Unit
7 top-level lines as of r146390| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Bottom Drafting Roller | roving-frame-bottom-roller | 4× | 4 | · | part |
| 2 | Top Pressure Roller | roving-frame-top-roller | 4× | 4 | · | part |
| 3 | Double Apron Pair | roving-frame-apron-pair | 1× | 1 | · | part |
| 4 | Fiber Condenser | roving-frame-condenser | 2× | 2 | · | part |
| 5 | Roller Weighting Arm | roving-frame-weighting-arm | 1× | 1 | · | part |
| 6 | Helical Gear Pair | gear-pair | 2× | 2 | · | part |
| 7 | Ball Bearing | ball-bearing | 8× | 8 | · | part |