| 摘要 |
A sealant applicator for applying a sealant to the countersink portion of a rivet bore in a workpiece includes an applicator head, a sealant supply, and a drive unit for moving the applicator head between the countersunk surface and the sealant supply. A sealant dauber is rotatably and adjustably mounted on the applicator head and is driven by a motor, also mounted on the head. A flexible applicator tip is fitted to one end of the dauber for receiving sealant from the sealant supply and applying it to the countersink surface. The sealant is supplied to the applicator tip from a reservior having an opening in which is located a sealant permeable member. Sealant is supplied to the reservoir from a sealant cartridge. A predetermined amount of sealant is passed through and is maintained above the permeable member before the applicator tip contacts the permeable member. When the applicator tip engages the permeable member a bead of sealant attaches to the tip. As the rotating applicator tip is removed from the reservoir opening, the sealant is sheared from the central portion of the permeable member, leaving a uniform annular bead of adhesive that is precisely positoned on the applicator tip. The applicator tip is then inserted in the rivet bore so that the tip surface engages the countersink surface and transfers the sealant to the countersink surface. The drive unit moves the applicator head, and thus the applicator tip, sequentially between three locations: a standby location wherein the tip is positioned adjacent and above the rivet bore; a workpiece engagement location wherein the tip engages the rivet bore; and a supply location wherein the tip engages the permeable member in the reservoir.
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