Needle plate of sewing machine
A needle plate of a sewing machine mounted on an upper surface of a bed of the sewing machine includes a support surface for supporting a fabric pressed by a presser foot, a needle opening through which a needle passes, and a feed dog slot through which a feed dog moves up and down and back and forth. The support surface has small projections and recesses.
1. A needle plate of a sewing machine mounted on an upper surface of a bed of the sewing machine, the needle plate comprising:
a support surface for supporting a fabric pressed by a presser foot;
a needle opening through which a needle passes; and
a feed dog slot through which a feed dog moves up and down and back and forth,
wherein the support surface has small projections and recesses,
wherein the support surface has a rough surface portion instead of the small projections and recesses only in a region surrounding the needle opening.
2. The needle plate of a sewing machine according to claim 1 , wherein the small projections and recesses are regularly arranged projections and recesses.
3. The needle plate of a sewing machine according to claim 2 , wherein the regularly arranged projections and recesses include evenly arranged discontinuous protrusions.
4. The needle plate of a sewing machine according to claim 2 , wherein the regularly arranged projections and recesses include evenly arranged linear protrusions each extending continuously in a fabric feeding direction.
5. The needle plate of a sewing machine according to claim 1 , wherein the region surrounding the needle opening includes a region corresponding to the entire area of a lower surface of the presser foot that contacts the fabric.
6. The needle plate of a sewing machine according to claim 5 , wherein the small projections and recesses are regularly arranged projections and recesses.
7. The needle plate of a sewing machine according to claim 6 , wherein the regularly arranged projections and recesses include evenly arranged discontinuous protrusions.
8. The needle plate of a sewing machine according to claim 6 , wherein the regularly arranged projections and recesses include evenly arranged linear protrusions each extending continuously in a fabric feeding direction.
9. A needle plate of a sewing machine mounted on an upper surface of a bed of the sewing machine, the needle plate comprising:
a support surface for supporting a fabric pressed by a presser foot;
a needle opening through which a needle passes; and
a feed dog slot through which a feed dog moves up and down and back and forth,
wherein the support surface has small projections and recesses, and
wherein a surface of the small projections and recesses has a surface treatment layer made of a self-lubricating coating.
10. The needle plate of a sewing machine according to claim 9 , wherein the small projections and recesses are regularly arranged projections and recesses.
11. The needle plate of a sewing machine according to claim 10 , wherein the regularly arranged projections and recesses include evenly arranged discontinuous protrusions.
12. The needle plate of a sewing machine according to claim 10 , wherein the regularly arranged projections and recesses include evenly arranged linear protrusions each extending continuously in a fabric feeding direction.
13. The needle plate of a sewing machine according to claim 9 , wherein the support surface has a rough surface portion instead of the small projections and recesses only in a region surrounding the needle opening.
14. The needle plate of a sewing machine according to claim 13 , wherein the small projections and recesses are regularly arranged projections and recesses.
15. The needle plate of a sewing machine according to claim 14 , wherein the regularly arranged projections and recesses include evenly arranged discontinuous protrusions.
16. The needle plate of a sewing machine according to claim 14 , wherein the regularly arranged projections and recesses include evenly arranged linear protrusions each extending continuously in a fabric feeding direction.
17. The needle plate of a sewing machine according to claim 13 , wherein the region surrounding the needle opening includes a region corresponding to the entire area of a lower surface of the presser foot that contacts the fabric.
18. The needle plate of a sewing machine according to claim 17 , wherein the small projections and recesses are regularly arranged projections and recesses.
19. The needle plate of a sewing machine according to claim 18 , wherein the regularly arranged projections and recesses include evenly arranged discontinuous protrusions.
20. The needle plate of a sewing machine according to claim 18 , wherein the regularly arranged projections and recesses include evenly arranged linear protrusions each extending continuously in a fabric feeding direction.