| 摘要 |
In the machine shown, a series of upright, parallel, equispaced rotatable spindles, which for tubular workpieces serve as the mandrels therefor, extend from individual bearings carried by a constantly moving, substantially horizontally mounted link chain belt, a portion of whose path is straight, wherealong workpieces associated with the spindles, in succession, pass a marking station presenting a heated flat die whose face is upright and has thereacross a colored foil. In their passage along the die, the workpieces are roll marked thereby, but they are rotated by a positive drive, independent of contact with the die. Said die is allowed some wobble, but each bearing is held so the axis of its spindle is maintained in a fixed direction during passage along the marking station, and there is a means associated with each spindle, to adjust the peripheral speed of the workpiece in relation to the speed of said chain. An adjustably pressurized air cushion imparts the necessary pressure the die imposes on the work rolling thereon.
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