| 摘要 |
PURPOSE:To move downward a slider under a specified force with a simple means by using a driving wheel which is rotated by the unwinding force of a constant output spring for at least one roller of guide rollers provided freely rollably to a slide bar. CONSTITUTION:When a winding reel of a constant output spring 21 is rotated toward the direction of an arrow 30 after a welding rod 9 is set in a start position for welding, the spring 21 is wound into the reel. The welding is started when the spring 21 is thoroughly wound up. A slider 4 is supported by the rigidity of the rod 9 and is consequently prevented from descending before or right after starting of welding but as the rod 9 consumes, the winding reel is rotated toward the direction of an arrow 31 by the unwinding force of the spring 21. A pawl or leaf spring engages with a groove and a driving shaft 20 and a driving wheel 16 rotate in the same direction as the direction of the arrow 31, so that the slider 4 descends toward the direction of an arrow 11. The specified output is thus obtd. from the start till the end of welding and the satisfactory welding is accomplished. |
