Method of soldering pins to printed circuit boards, and soldering bath for this method

Claim 1

A method of soldering connection pins to printed circuit boards, comprising: supplying an elongated carrier strip carrying a multiplicity of connection pins attached thereto and extending vertically upward from the strip with a plurality of printed circuit boards aligned upright above the strip, a plurality of adjoining connection pins having their upper ends attached to each respective printed circuit board along a lower edge of the printed circuit board, passing the strip horizontally in its longitudinal direction throught a bath of liquid solder, while maintaining the alignment of the pins and boards above the strip, maintaining the solder bath depth sufficient to rise a given distance above the lower edge of the printed circuit boards, and causing solder to flow in the direction of strip movement at the location where the strip moves out of the bath, and removing the solder flow from solder-wet parts to a level below the strip.

Claim 2

A method of soldering connection pins to printed circuit boards, comprising: supplying an elongated carrier strip carrying a multiplicity of connection pins attached thereto and extending vertically upward from the strip with a plurality of printed circuit boards aligned upright above the strip, a plurality of adjoining connection pins having their upper ends attached to each respective printed circuit board along a lower edge of the printed circuit board, passing the strip horizontally in its longitudinal direction throught a bath of liquid solder, while maintaining the alignment of the pins and boards above the strip, maintaining the solder bath depth sufficient to rise a given distance above the lower edge of the printed circuit boards, and causing solder to flow in the direction of strip movement at the location where the strip moves out of the bath, and removing the solder flow from solder-wet parts to a level below the strip.

Claim 4

An apparatus for soldering elements to the lower edge of an upright board, comprising a bath of molten solder, a soldering nozzle projecting upward from the bath, and means for circulating solder up into the nozzle, characterized in that said nozzle comprises an overflow rim having two recesses in the rim disposed opposite each other, lower edges of the recesses being arranged above the level of solder in the bath; and a supporting strip extending between said lower edges for supporting a carrier strip carrying elements to be soldered and being transported through the solder, and said nozzle having a top opening having a width, transverse to the transport direction of the carrier strip, greater than the width of the recesses; and said recesses having a width greater than that of a carrier strip and elements being transported through the bath, such that there is a flow of liquid solder past a carrier strip and elements being transported through the recess, in the direction of transport at the recess where such strip leaves the bath.

Claim 5

An apparatus for soldering elements to the lower edge of an upright board, comprising a bath of molten solder, a soldering nozzle projecting upward from the bath, and means for circulating solder up into the nozzle, characterized in that said nozzle comprises an overflow rim having two recesses in the rim disposed opposite each other, lower edges of the recesses being arranged above the level of solder in the bath; and a supporting strip extending between said lower edges for supporting a carrier strip carrying elements to be soldered and being transported through the solder, and said nozzle having a top opening having a width, transverse to the transport direction of the carrier strip, greater than the width of the recesses; and said recesses having a width greater than that of a carrier strip and elements being transported through the bath, such that there is a flow of liquid solder past a carrier strip and elements being transported through the recess, in the direction of transport at the recess where such strip leaves the bath.