: a bar on a sewing or knitting machine for holding the needle or needles.

What does needle clamp mean?

Needle clamp for sewing machine, particularly child''s sewing machine, with the needle clamp knob located between the parallel needle and presser bars. The clamp knob and screw extend from the needle bar to strike the presser bar when retracted from the sewing needle, thereby preventing loss of the clamp screw.

What is presser bar?

: a bar to which the presser foot of a sewing machine is attached.