Happy HCS-1201-30, Maintenance Manual

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Relation between needle and upper thread
3-1-4
1. Description of needle
Basically please use [DB X K5] in standard accessory.
If description or thickness of cloth doesn't suit needle size, poor sewing finish / thread break / skipping will occur.
Therefore careful attention is required in selecting needle.
2. Relation between needle and upper thread will be found below. (Representative example is shown.)
Needle - Size is [#11] in standard accessory.
If necessary, please select in accordance with description of thread and cloth.
Thread - In case needle size is [#11], if thread is rayon,[#120] is recommendable.
Relation between needle and upper thread
Denier(d)
If needle size and thickness of thread don't match, following problem will be likely to occur.
- Thread break
- Skipping
- Poor sewing finish