1-needle, Lockstitch Machine DDL-5550N-7 & DDL-5550N
The thread take-up mechanism, feed mechanism, thread paths and hook have been further improved to enhance responsiveness to material changes and to ensure consistent stitch quality
| Model name | DDL-5550N-7 | DDL-5550N |
| Application | Medium-weight | |
| Max. sewing speed | 5,000rpm | 5,500rpm |
| Max. stitch length | 4mm | 5mm |
| Presser foot | By knee: 13mm | |
| Needle | DB×1 (#14),134 (Nm75) | DB×1 (#14),134 (Nm90) |
| Model name | DDL-5550NA-7,5550NA | DDL-5550NH-7,5550NH |
| Application | Light-weight | Heavy-weight |
| Max. sewing speed | 4,000rpm | |
| Max. stitch length | 4mm | 5mm |
| Presser foot | By knee: 9mm | By knee: 13mm |
| Needle | DA×1 (#9),134 (Nm65) | DB×1 (#21),134 (Nm130) |
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