The universal feed aari embroidery machine is a staple of Surat's embellishment sector. It crafts exquisite chainstitch, moss (loop) stitch, and tape cording on sarees, bridal lehengas, and sherwanis using a single hooked needle guided by a 360-degree rotating directional handle.
Calibrating an aari machine requires a subtle touch because metallic zari and raw silk threads possess minimal elasticity.
1. Understanding the Needle & Nipple Mechanism
Unlike lockstitch machines, the aari embroidery needle has an open hook tip rather than an eye.
- As the needle descends through the fabric, the lower thread carrier wraps zari around the hook.
- When the needle rises, the mechanical brass nipple (presser collar) descends to cover the hook opening, preventing the thread loop from slipping off before emerging above the fabric surface.
- Nipple Timing: The nipple must seal the needle hook precisely as the needle eye clears the fabric surface. If it seals too late, the thread drops into the bed; if it seals too early, it snags the fabric yarn.
2. Tuning Tension for Metallic Zari
Metallic zari consists of an inner cotton or polyester core wrapped in delicate metallized polyester film.
- Ultra-Light Tension: The thread tension discs must exert only minimal friction. Over-tightening strips the metallic foil off the core, resulting in silver or gold thread breakage.
- Felt Washer Dampening: Place soft felt washers between tension discs to absorb tension spikes during rapid handle rotation.
3. Handle Direction Coordination
The operator rotates the under-table directional handle with one hand while feeding the machine with the foot treadle.
- Always rotate the handle smoothly into curved motifs. Abrupt 180-degree jerks without continuous needle cycling cause the hook to snap delicate zari thread loops.
- Keep the fabric taut inside a wooden or metal embroidery frame (adda) to prevent puckering.
