| 摘要 |
The apparatus comprises an assembly of three linearly positioned frames, namely a folding frame (4), a backing frame (3), and a holding frame (5). Each of the folding and holding frames comprises a circular array of spaced rods, which array can be advanced and retracted longitudinally, and expanded and contracted radially. The backing frame comprises a circular array of spaced rods which are fixed. The folding frame operates within the plastic storage bag to be folded. The folding frame is adapted to expand to grip and stretch a length of "section" of the bag. This section then can be advanced over the backing frame to bring it into register with the latter. The frame can then be contracted to deposit the section of bag on the backing frame and the stack of bag sections already folded and carried thereon and to clamp the stack to the backing frame. The folding frame can then be retracted to withdraw it from the stack. The holding frame is adapted to be advanced over the backing frame, contracted to clamp the stack to the backing frame, and retracted to withdraw it from the frame. The rods of the arrays are spaced so that the stack of folds may be clamped in a sawtooth fashion to hold them tight to the backing frame. The holding frame rods, when clamped on the stack, serve as a template for the next following section of bag to be folded over. |
