Gripper drum
US4145040A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1977 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | Sep 7, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2406/365
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A gripper drum having in the peripheral surface thereof a number of apertures aligned in rows running parallel to the rotational axis of the drum, the rows defining an active suction zone. Each row of apertures is connected to a duct located below the surface of the drum and each duct is connected by a conduit to a bore in a stationary part of the drum, the bore being connected to a source of suction so that as the drum rotates about the inner stationary part suction is applied to the apertures. Pistons, one for each duct, are mounted on a plate which can be moved to insert the pistons into one end of each duct respectively, the opposite ends of the ducts being closed thereby sealing off the apertures from the suction source and altering the width of the active suction zone on the periphery of the drum. The conduits are connected to positions on the ducts progressively remote from the ends into which the pistons are inserted. The drum can comprise an annular outer part, having the apertures, ducts and conduits, which rotates about a stationary cylindrical part having a groove in its periphery connected to the bore for the suction source. The conduits are aligned with the groove so …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.