| 摘要 |
<p>PURPOSE:To reduce a time to start a welding operation to enhance a working efficiency by a method wherein an ultrasonic horn part is so controlled as to move at a relatively high speed just before a tool horn abuts against a work and move at a relatively low speed while applying a predetermined pressure to the work in a period of time from just before the contact to the contact. CONSTITUTION:Under the control of a main controller 7 based on a position sensor 13, when a top of a tool horn 6c of an ultrasonic horn part 6 exists in an area H1 with respect to a work W, air is supplied into an air cylinder 5 through pipes 17, 22, a change-over valve 12, a pipe 20, a first speed controller 9, and a pipe 18, and the ultrasonic horn part 6 is controlled by the first speed controller 9 so as to be lowered at a high speed. Next, when the top of the tool horn 6c is moved into an area H2, air is supplied from the change-over valve 12 through a pipe 21, a second speed controller 10, a pipes 19, and the pipe 18, and the ultrasonic horn part 6 is controlled by the second speed controller 10 so as to be lowered at a low speed.</p> |
