Patent ID: 8312637

Claim:
An alignment tool for determining the parallelism between the anvil face of an anvil that is fixedly mounted on an ultrasonic welder and the horn faces of a replacement horn that is adjustably mounted on the welder by a rotary mount, so that the replacement horn can be rotated to an aligned position parallel with the anvil face and then fixed in place on the welder against further rotation; comprising: a tool base; the tool base having a face plate with a tool face for contacting with the anvil face; a clamp for clamping the tool base on the anvil so that the that tool face is contacting with the anvil face; a plate member mounted on the tool base for swiveling movement, said plate member having a plate face for contacting with the horn faces; at least one spring acting between the tool base and the plate member to urge swiveling movement of the plate member so that the plate face of the plate member is held by the spring force in contact with the ss while the replacement horn is rotated relative to the anvil; and at least one transducer sensing the relative positions between the tool face contacting with the anvil face and the plate face contacting with the horn faces so that the repairman can determine that the replacement horn has been rotated to the desired position in which the horn face has become parallel with the anvil face and the replacement horn can then be tightened against further rotation.