| 摘要 |
<p>1479726 Soldering METAL BOX Ltd 4 Oct 1974 [9 Oot 1973] 47151/73 Heading B3R In soldering a seam on a body, the body is advanced past an orifice, a continuous solder wire is fed towards a solder wire melting means, wherein the wire is melted in a cavity thereof and the melted solder is caused to be directed as a jet through the orifice, the melted solder being urged through the orifice substantially solely by the pressure exerted on the melted solder in the cavity by the wire being advanced intermittently to the melting means. A solder wire 2 is, in an embodiment, drawn from a spool 15 Fig. 1 and fed intermittently by a reciprocating gripper feed device 4 operated by a cam driven from the main drive shaft 26 to a solder wire melting block 3 while can bodies formed in a unit 22 and fluxed are fed along a support 17 in synchronism with the feed of the solder wire over the block 3. The block 3 is electrically heated by heaters 23 and controlled by thermocouple 24 and the wire is fed into it through a nozzle 19 Fig. 4 to a cylindrical cavity 11. The forward motion of the wire maintains a sufficient pressure to cause the molten solder to issue as a jet from the orifice 12 to the internal seam of the can, back flow of molten solder from the cavity being obviated by the chilling effect of cold solder wire in the nozzle 19. The can bodies may be rectangular or cylindrical and the solder jet may be supplied externally to the can body. The can body side seam may be heated before and/or after the application of the solder thereto.</p> |
