Mitsubishi Jukogyo Kabushiki Kaisha

Tadao Ozaki

Yoshinori Yuzaki

Tsutomu Oe

Katsuzo Sudo

Shigeaki Kimura

Sadatomi Uemukai

An apparatus for fabricating multi-layer spiral tubes of the type that while the webs are being wrapped in a spiral form the adjacent edge portions of the webs are welded with each other to form spiral tubes, is improved in that the apparatus has a take-up drum for taking up the wrapped webs while rotating with the leading end of the web of the first layer fixedly secured thereto, a wrapping drum having the webs wrapped therearound and including a backing section for backing a welding location of the edge portions of the web of the first layer, a plurality of web feed devices provided adjacent one another for spirally feeding the webs on the wrapping drum of the spiral tubes of the preceding layers, a plurality of wrapping devices provided in combination with the respective web feed devices for spirally wrapping the web on the wrapped drum or the spiral tubes of the preceding layers, and a drawing device for drawing from the wrapping drum the spiral tubes that are being formed continuously.

Apparatus for fabricating multi-layer spiral tubes

An apparatus for fabricating multi-layer spiral tubes including first drive means for performing rotation of an inner cylinder around which a web is to be wrapped spirally a slide base moveable along the longitudinal direction of the inner cylinder, the slide base being disposed on a bed so as to be slidable along the longitudinal direction of the inner cylinder, a plurality of pairs of cradles mounted on the slide base for placing the inner cylinder thereon, first depressing rolls for wrapping the web, second depressing rolls for constraining a weld portion of the web, an automatic gap detector for detecting a gap between adjacent edge portions of the wrapped web, an automatic welding machine for welding edge portions of the wrapped web, an automatic grinding machine for grinding excess metal of welding, an automatic defect hunter for detecting defects in the weld portion, a web feed table for feeding the web, second drive means for moving the web feed table, and a central control unit is provided and coupled to the first drive means, the cradles, the first depressing rolls, the second depressing rolls, the automatic gap detector, the automatic welding machine, the automatic grinding machine, the automatic defect hunter, the web feed table and the second drive means, for controlling the operations of these component means in a concentrated manner.

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Hiroshima, Japan

Tadao Ozaki