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Welder For Transistors

IP.com Disclosure Number: IPCOM000098206D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Reichle, H: AUTHOR

Abstract

In the manual assembling of semiconductors such as alloy transistors, the welding of the device to a header requires considerable skill. A welder for automatically joining the transistor assembly to the header is shown. The transistor has been previously assembled in a carbon boat 10 having a plug 11. The germanium dice with the collector and emitter dots has been bonded to a base tab 12 and emitter and collector wires 13 and 14. The plug 11 is so formed as to hold the transistor when the boat is removed. Three indexed star wheels A, B and C transport the transistor and header through the steps of welding.

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Welder For Transistors

In the manual assembling of semiconductors such as alloy transistors, the welding of the device to a header requires considerable skill. A welder for automatically joining the transistor assembly to the header is shown. The transistor has been previously assembled in a carbon boat 10 having a plug 11. The germanium dice with the collector and emitter dots has been bonded to a base tab 12 and emitter and collector wires 13 and 14. The plug 11 is so formed as to hold the transistor when the boat is removed. Three indexed star wheels A, B and C transport the transistor and header through the steps of welding.

A boat and plug carrying a transistor is fed by a belt 15 to star wheel A which is indexed through five positions. At position A1 the boat is inserted in a slot in an arm of the wheel. At position A2 the flange of the boat is fed into an inclined serrated track 16 that vibrates the boat free from the plug. The boat is removed from the plug at station A3, the boat being fed onto a tray 17. Star wheel A then carries the plug with the transistor to station A5 where a pair of cam-actuated spring fingers 18 on an arm of star wheel B grasps the base tab 12 of the transistor and a cam (not shown) raises the star wheel to remove the transistor from the plug 11. This plug is removed from the star wheel at B3 and fed into a holder 20. When the holder is full, a group of the plugs is transferred to a tray 21.

At station B5 the base tab 12 is welded...