Patent GB-741813-A (GB)
Title: Improved device for soldering pins, sockets and the like to the ends of wires and the like
Inventor: DIXON HENRY JOHNSON
IPC: B23K11/00
Filed: 1952-05-20
Abstract: 741,813. Soldering. BRITISH INSULATED CALLENDER'S CABLES, Ltd. May 17, 1953 [May 20, 1952], No. 12732/52. Class 83 (4). In a machine for automatically soldering a pin to a wire there is provided an automaticallyreciprocated carriage for gripping the pin and carrying it to the wire, and means for heating the pin during the movement of carriage towards the wire, the gripping of the pin being initiated by the insertion of the pin into the carriage. In an embodiment a cable 13 having end wires 16 is supported in an apertured plate 14 which is mounted on a pivoted arm 18. A pin 21 in the end of the arm 18 may be engaged in one of a number of holes H1, H2, &c. in a pattern 22 related to the arrangement of the wires 16. Lamps K1; K2, &c. are provided associated with the holes in the pattern. A carriage 23 is vertically slidable above the cable by means of a piston and cylinder 28. In the carriage a pair of electrodes E1, E2 for gripping the pin are operated by a bellows EB and a switch CS to be closed by the pin when it is in the carriage. With the carriage in the normal raised position a pin is inserted between the electrodes to close the switch CS. If the pin 21 is in the correct hole H1, H2, &c. in the pattern indicated by lighting of the appropriate lamp K1, K2, &c. current from a D.C. supply is fed through a contact 51 of a selector switch through the switch CS to the contact L1 of a selector switch K to energize the coil 59 of the switch to move its moving contact S, L. M. N to contacts L2, M2, N2 respectively. With contact M in this position a valve V1 is operated to allow air into the bellows EB to grip the pin. Current also passes through the movable contact of a pneumatically-operated switch P1 to its fixed contact 54 and to the OFF coil of a relay DR to open contacts 57, 58 so that the primary of electrode supplying transformer 61 may not be energized. Hand-operated valves O1, O2 are then opened to operate switch P1 and a switch P2. The moving contact of P1 moves to contact 60 and current energizes the ON coil of relay DR through contacts D1 and D2 in a process timer TABCD. The contacts 57, 58 are closed and since P2 has closed its contacts the transformer 61 is energized. Current flows to the electrodes to heat the pin and relay HR closes its contacts HR3, HR4 and opens HR1, HR2. The opening of HR1, HR2 breaks D.C. supply to a relay RT which opens its contacts and allows impulses from a generator G to feed into the switch T of the timer. The closing of contacts HR3, HR4 lights a lamp LR and supplies D.C. to the contact L2, to energize coil 59 and move the moving contacts L. M. N to contacts L3, M3, N3 respectively. In this position valve V2 is energized to supply air to the top of the cylinder 28 and so move the carriage downwardly. While the carriage is moving, the moving contacts of timer TABCD are being rotated step by step and after a time a supply of D.C. is connected through contact A1 to the OFF coil of relay DR to open contacts 57, 58 and so cut off current to the transformer 61 and thus to the electrodes. The timer is subsequently stopped when current passes via contacts A2 to reenergize relay RT. When the carriage reaches the bottom of its stroke a projection on the carriage operates an air valve 44 which causes the slow movement of a piston 43 which operates a valve 46 to admit cooling air to the carriage. A switch P3 is also operated to open its contacts 65, 66 to de-energize the relay RT and restart the timer. After a delay D.C. supply is connected to contact L3 to energize coil 59 and cause the contacts L, M, N to move to contacts L1, M1, N1 respectively. Valves V1 and V2 thus are de-energized and the pin is released and the carriage raised. When the carriage reaches its top position the switch S is operated to energize relay RI to move contact 51 one position. When the pin 21 is inserted in the correct hole the process is repeated.