sewing machine [3]![click to hear](/images/speaker.jpg)
Machine used to assemble two pieces of fabric by means of a series of stitches made with a needle and thread.
tension block ![click to hear](/images/speaker.jpg)
Parts that control the tension of the upper thread.
thread guide ![click to hear](/images/speaker.jpg)
Part that leads the thread toward the tension disk.
tension disk ![click to hear](/images/speaker.jpg)
Each of the parts between which the thread passes during threading.
tension dial ![click to hear](/images/speaker.jpg)
Graduated dial used to regulate the tension of the upper thread.
tension spring ![click to hear](/images/speaker.jpg)
Spring that keeps the upper thread between the tension disks.