GB162661A - Automatic vacuum soldering machine - Google Patents

Abstract

162,661. Chakravarty, A. C. Mav 3, 1920, [Convention date]. Void [Published under Sect. 91 of the Act]. Drawings referred to in Specification, but not filed. Soldering filled receptacles.-In a machine for automatically sealing cans filled with meat &c., the, cans are mounted in chambers on a carrier, from which air is automatically exhausted through the filler opening and the cans then automatically soldered round the filler opening, thus avoiding the necessity for a pin hole in the lid for exhausting and sealing purposes. The carrier which is continuously rotated by bevel and worm gear round a hollow casting is provided with a series of arms at the ends of which are cylindrical chambers below which are a corresponding number of blocks on spindles engaging a cam track on an annular extension from the casting for raising the cans in turn into the chambers and closing the ends of the chambers. The chambers have flared ends for centring the cans and are provided with rubber rings for sealing the chambers. The arms are hollow and connect the chambers with curved ports on the hub of the carrier, which move over elongated ports in the centre of the casting, which is connected to the suction apparatus. After exhaustion is effected the ports move out of alignment during the soldering operation, and after soldering is completed the chambers are put into communication with ports leading to the atmosphere. The cans are first placed on a feed table which is rotated by bevel gear from the carrier and are pushed on to the blocks in turn by radially moving plungers operated by a stationary cam. Pairs of pivoted guides are mounted on the table, being swung outwards at the receiving station by the means which operate the plungers and being swung inwards when they reach the position at which the cans are transferred to the carrier blocks. Each block contains a,lift plate operated by cams on a shaft provided with two pins engaging cams on the hollow casting, so as to push the can into contact with a soldering iron passing through an airtight joint in the upper housing of the chamber. The blocks are provided with cam-operated ejectors to remove the finished cans. Soldering-irons.-Each soldering-iron has an annular internally and externally bevelled edge and is mounted on a shaft rotated by an internally toothed continuous or gapped gear fixed to the hollow casting, the shaft having a slight longitudninal play so that the iron may press by gravity on the can. The irons are electrically heated by a filament or winding to which current is supplied by brushes to contacts secured to the shafts, the, brushes being electrically connected to further brushes on the carrier moving over contacts on the casting.