| 摘要 |
PURPOSE:To construct a ribbon manufacturing apparatus for petal-shaped fin tubes by synchronizing intermittent rotation of a gearlike lower die having complex waveform teeth and up-and-down motions of a slide equipped with a ribbon pressing die and an upper die and feeding a ribbon material between the lower die and both of the ribbon pressing die and the upper die. CONSTITUTION:When a ribbon material 25 is fed between the gearlike lower die 12 and the ribbon pressing die 10' and the upper die 10 and the slide 3 is moved down by actuation of an eccentric circular plate 4, claws of the die 10' and the die 10 press the ribbon 25 onto wavy grooves of the die 12 through springs 9 and 9'. In that time, the up-and-down motion of the slide 3 and the intermittent rotation of the lower die 12 are synchronized so that the die 12 is rotated by one pitch length of the wavy grooves 12a when formation of one pitch of the ribbon 25 is finished by the slide 3. A petal-shaped fin tube 30 is obtained by winding an accordion bandlike ribbon 24 formed along by the complex waveform teeth of the die 12 on a tube 31. Thus, the ribbon manufacturing apparatus for the specified polygonal petal-shaped fin tube is obtained.
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