Wireworking – Crimping
Patent
1985-01-22
1986-12-02
Larson, Lowell A.
Wireworking
Crimping
B21F 100
Patent
active
046257721
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for bending a leg of a component inserted on a printed circuit board.
During the assembly of electronic components onto printed circuit boards, it is often necessary to hold a component onto the board by bending the leads or legs which protrude through the board in opposite directions prior to soldering or otherwise securing the component in place. Where the insertion is carried out automatically by machine, this is normally achieved by a simple mechanical device which is limited to bending the legs or leads only in (or alternatively out) with respect to the component and is not readily adjustable in different directions of bend, or lead pitch.
According to one aspect of the present invention, there is provided a device for bending a leg of a component inserted in a printed circuit board, comprising a member for engaging the leg of the component and means for moving the engaging member in any of a plurality of different directions so that the components leg can be bent in a selected direction.
In a second aspect, the present invention provides apparatus for bending the legs of a component inserted in a printed circuit board comprising a plurality of bending devices in accordance with the first aspect of the invention and means for controlling the moving means of the respective devices so as to control the relative movement of the respective members.
For a better understanding of the present invention, and to show how the same may be put into effect, reference will now be made, by way of example, to the accompany drawings, in which:
FIGS. 1 and 2 illustrate diagramatically the method by which a component lead is inserted into a printed circuit board;
FIG. 3 illustrates in plan view a device embodying the invention;
FIG. 3A is a view, partly in section, taken along the direction of arrow A in FIG. 3 of a drum of the device; and
FIG. 4 illustrates apparatus comprising two of the devices shown in FIG. 3.
Referring now to the drawings, FIG. 1 shows a component lead or leg 1 protruding through a printed circuit board 2 onto an anvil 3 of a bending device which is constrained to move the anvil 3 in only one direction, that is, from right to left in the drawings. FIG. 2 shows how movement of the anvil 3 causes the components lead 1 to bend.
FIG. 3 illustrates diagrammatically a bending device embodying the invention.
The device 3' comprises a motor 4 connected to a gearbox 5. The output shaft of the bearbox 5 carries a first gear 6 which meshes with a second gear 7 rotatably mounted to a frame 8 of the device. The second gear 7 meshes with a third gear 9. One end of a rod 10 is mounted so as to be rotatable with the third gear 9. The rod 10 is freely rotatably mounted to the frame 8 so as to be both rotatable about its axis and pivotable with respect to the frame 8. The other end of the rod 10 carries the anvil 3 so that anvil 3 is rotatable with the rod 10 and is movable in translation when the rod 10 is pivoted.
A fourth gear 11 is also secured to the gearbox output shaft and meshes with a fifth gear 12 carried on one end of a shaft 13 rotatably mounted in the frame 8. The other end of the shaft 13 is connected by gearing to a drum 16 so that transmission is provided from the motor 4 to the anvil 3 and the drum 16.
A drum support shaft 17 extends into the drum 16 and is geared thereto. One arm 18a of a bifurcate rocking member 18 rests on the free end 17a of the drum support shaft. the other arm 18b of the rocking member 18 which is pivotally mounted to the interior of the drum is arranged to engage in an aperture 19 formed in a slider 20. The slider 20 is disposed in the drum so as to be rotatable with the drum and slidable in a radial direction of the drum. The slider 20 is connected via a rod 25 to the anvil 3. Rod 25 is pivotally and slidably mounted intermediate its ends, with one end of the rod 25 being pivotally mounted to the slider 20 and the other end of the rod 25 being pivotally mounted to the anvil 3.
FIG. 3a is a view along the arrow A of FIG. 3, partly in section
REFERENCES:
patent: 3019822 (1962-02-01), Jacobson
patent: 4151637 (1979-05-01), Zemek
patent: 4288914 (1981-09-01), Vancelette
patent: 4309808 (1982-01-01), Dean et al.
Ambotech Limited
Larson Lowell A.
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