Fluid pressure tensioning apparatus for a web threading endless rope
US5377892A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1993 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Aug 12, 2013 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21G9/0072
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A compact rope stretcher maintains the tension in an endless rope used for threading a web in a papermaking machine and includes a beam having a flange forming a track which is engaged by guide wheels supporting a pair of separate carriages. The carriages support corresponding rope sheaves for free rotation, and a pair of fluid cylinders are mounted on the beam and enclose pistons connected by corresponding piston rods directly to the corresponding carriages. The beam may be mounted on the papermaking machine with its track-forming flange extending at an angle to the horizontal so that the respective piston rods extend upwardly and downwardly from the cylinders. Pressurized fluid is supplied to the upper end of the one cylinder having the downwardly extending piston rod, and the upper end of the other cylinder is vented to atmosphere. The lower ends of the two cylinders are interconnected by a fluid passage to form a closed circuit which is filled with hydraulic fluid. The fluid causes upward movement of the piston in the other cylinder in response to downward movement of the piston having the downwardly extending piston rod and counterbalances the weights of moving components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.