| 摘要 |
A belt-like film (43) is moved along a plate (41) folded to be rectangular in section, so that the film (43) is formed into a continuous tube by a tubular frame of the plate (41). One end of a spring piece (46) is fixedly set to a base block (45). An anvil (47) is formed on the other end of said spring piece (46), so that clasped-hands like edges of the tubular film (43) may be melded by the cooperation of the aforementioned anvil (47) and a movable hammer (50) which applies ultrasonic vibratory impact on said anvil (47). |
