| 摘要 |
<p>LONG FOLD SUPPORT STRUCTURE FOR ZIGZAG WEB-FED FOLDER An improved spiral-type zigzag web folding unit is provided which includes an inexpensive, replaceable, constant tension recoil spring coupled to the shiftable web feeder chute of the folding unit for individually and successively supporting relatively long web sections as they are fed, in order to prevent excessive gravity-induced sagging thereof and consequent failure of the spirals to engage and receive the fed sections. Use of an oscillating recoil spring permits high-speed folding operations with automatically timed support for the web sections, notwithstanding the fact that the spring requires no adjustment in use and can be easily installed and replaced using readily available materials and tools. Furthermore, coupling of the spring to the feeding chute ensures that the spring does not impede web feeding but rather moves in timed relationship therewith for support purposes. The support spring assembly hereof is also advantageous in that inertia problems are minimized and support is provided along a substantial portion of the web sections in timed relation to the feeding thereof.</p> |
