Patent GB-885758-A (GB)
Title: Improved apparatus for assembling electrical components upon workpieces
Inventor: ANDERSON ROBERT WALTER ALEXAND
IPC: H05K13/04
Filed: 1959-10-20
Abstract: 885,758. Assembling electrical components on circuit boards. DE HAVILLAND AIRCRAFT CO. Ltd. Oct. 18, 1960 [Oct. 20, 1959], No. 35419/59. Class 83 (2). In apparatus for attaching electrical components on to printed circuit boards comprising a component magazine and means to convey components from the magazine into position beneath an insertion tool, a magazine for one size of component is detachably secured in position on the apparatus and carries a stop to limit the movement of the insertion tool in accordance with the size of the components. A body 14 of rectangular cross-section is supported vertically above a base 10 by brackets 12. In a slideway 15 in the back of the body is a bracket 16 secured to the piston of a pneumatic motor 20. A guide bar 26 slidable in recesses 22 (not shown), formed in the body 14 on each side of the slideway 15 has a vertical longitudinal slot through which the bracket 16 passes and also has a vertical recess in which a tool-holder 32 is slidably mounted. The insertion tool comprises a blade 34 guided in grooves 36 in the guide bar, which grooves also receive and guide the downwardly bent ends of the component leads. In front of the recesses 22, the body 14 has a pair of vertical longitudinal recesses 38 extending from the top of the body down to a pair of stationary shear blades 40 with notched upper surfaces. Slidable within the recesses 38 is a tool 42 comprising an upper part 44 supported from a pin 46 secured in the tool-holder 32. Slidable in a bore in the part 44 is a bolt 50 backed by a spring 58 engaging a bolt 54 which closes the top of the bore and also acts as an abutment for an adjustable hammer bolt 56 carried by the tool-holder. The lower part 48 of the tool 42 comprises two movable shear blades 62 to co-operate with the blades 40 for cutting the leads to the required length and with a former (not shown) for bending the ends of the leads downwardly. To the front of the body 14 are screwed a channel-shaped guide 68 and the body 70 of a component magazine having a front wall 72 spaced from the guide 68 so as to leave room for the particular size of component and vertical slots through which the leads extend. The bracket 16 carries a roller 84 which engages a cam surface 96 formed on a lever 86 pivoted to the body 14 at its upper end and at its lower end engaging a rod 90 so that the latter is moved forwards and backwards as the bracket 16 is moved down and up again by the motor 20. The front end of the rod carries a bracket 100 to which are secured two rearwardly-extending fingers 102 with stepped upper surfaces adapted, on a rearward movement of the rod, to engage the leads of the lowermost component in the magazine and carry them into the notches of the lower shear blades 40. In operation, as the piston of the motor 20 descends, the leads are cut to the required length by the shear blades, the ends are bent down over the former and the component pushed down so that the leads pass through holes in a circuit board resting on an anvil shaped so as to clinch the projecting leads beneath the board. The extent to which the inserting tool descends is limited by a stop in the form of a dowel pin 78 forming part of the magazine and of such a size that the components carried by the magazine just rest on the board at the bottom of the descent. For attaching components of another size, a different magazine is secured to the body 14.