EP 0061184 B1 19850619 - METHOD OF MAKING SEWING-MACHINE NEEDLES
Title (en)
METHOD OF MAKING SEWING-MACHINE NEEDLES
Publication
Application
Priority
- DE 3111632 A 19810325
- DE 3150673 A 19811221
- DE 3201285 A 19820118
- DE 3207167 A 19820227
Abstract (en)
[origin: US4524815A] The present invention relates to a method for the manufacture of sewing machine needles from a cylindrical length of wire by form pressing a length of wire having a diameter which corresponds to the thickness of the needle butt, the wire is reduced to approximately the final cross sectional dimension over at least the length of the needle shank and the shoulder. The thread grooves are pressed in from the curved outer surfaces of the length of wire within the region of the needle shank. The reduction in cross section is effected by pressing opposite cross sections of wire material to form laterally protruding flat burrs. In between the flat burrs are transverse convex curved outer surfaces which lie within the final diameter. This intermediate form of the needle closely resembles its complete final shape. Several needle blanks, in particular two needle blanks, are attached together in the region of their points for simultaneous form pressing. The flat burrs are then removed completely or to the greater extent by a subsequent cutting.
IPC 1-7
IPC 8 full level
B21G 1/02 (2006.01); B21G 1/04 (2006.01); D05B 85/00 (2006.01)
CPC (source: EP KR US)
B21G 1/02 (2013.01 - KR); B21G 1/04 (2013.01 - EP US); D05B 85/00 (2013.01 - EP US); Y10T 29/49792 (2015.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0061184 A2 19820929; EP 0061184 A3 19830622; EP 0061184 B1 19850619; BR 8201667 A 19830216; DE 3264217 D1 19850725; HK 28989 A 19890414; IN 158281 B 19861011; KR 830008757 A 19831214; KR 870001563 B1 19870904; MX 158661 A 19890223; PT 74645 A 19820401; PT 74645 B 19830914; US 4524815 A 19850625
DOCDB simple family (application)
EP 82102324 A 19820320; BR 8201667 A 19820324; DE 3264217 T 19820320; HK 28989 A 19890406; IN 732DE1982 A 19820930; KR 820001258 A 19820324; MX 19196282 A 19820324; PT 7464582 A 19820324; US 35954082 A 19820318