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Dampening of Vibratory Feed Bowls

IP.com Disclosure Number: IPCOM000074972D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Busacco, RA: AUTHOR [+2]

Abstract

Vibratory feed bowls are conventionally mounted on a bowl mounting plate 10 which in turn is supported by leaf springs 11 (one shown) spaced circumferentially about the bowl, the leaf springs being attached, at their lower ends, to a base 12. The bowl is driven by a pair of electromagnets 13, 14 which are alternately electrically energized and de-energized. The resultant motion of the bowl as the leaf springs 11 are deflected, is both rotational and vertical. This composite motion feeds semiconductor chips and the like, in the bowl, along a circular path or track to a predetermined pickup point.

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Dampening of Vibratory Feed Bowls

Vibratory feed bowls are conventionally mounted on a bowl mounting plate 10 which in turn is supported by leaf springs 11 (one shown) spaced circumferentially about the bowl, the leaf springs being attached, at their lower ends, to a base 12. The bowl is driven by a pair of electromagnets 13, 14 which are alternately electrically energized and de-energized. The resultant motion of the bowl as the leaf springs 11 are deflected, is both rotational and vertical. This composite motion feeds semiconductor chips and the like, in the bowl, along a circular path or track to a predetermined pickup point.

If the supporting leaf springs 11 are not tuned properly, that is, if they have unequal spring constants, the chips will not be fed along the path or track. Conventionally this condition is corrected by adjusting the compression of dished washers 15. After extended use this adjustment is unsuccessful. It has been found that a curved spring 16 positioned so as to bear against one of the leaf springs 11, with its opposite end disposed intermediate the dished washer 15 and the leaf spring, may serve through proper tightening of the adjustment screw 17 to tune the system into proper semiconductor chip feeding operation. Single curved spring 16 is usually sufficient to bring the system into balance, but if necessary multiple curved springs may be used.

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