Which sewing machine is equipped with drop feed with alternating pressers?

The Chandler 767 is specifically designed with features that include a drop feed mechanism and alternating pressers. This configuration allows for enhanced versatility when sewing, making it suitable for a wide range of fabric types and stitching techniques. The drop feed feature facilitates the feeding of fabric during the sewing process by allowing the presser foot to release the material, which is particularly useful when sewing multiple layers or different textures. Additionally, the alternating presser system helps ensure that fabric is held firmly in place while being stitched, preventing slipping or bunching. This makes the Chandler 767 an ideal choice for complex sewing tasks.

In contrast, while other machines like the Consew 206RB and Consew 406RB are robust industrial sewing machines, they may not possess the same combination of drop feed and alternating presser capabilities that the Chandler 767 has. The Singer 321 is primarily known for lighter tasks and may not cater to the specialized needs met by the Chandler model. Thus, the Chandler 767 stands out as the correct answer for its specific functionality related to the question.