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US 4,165,811 AGranted
Material gripping device
AssigneeService d'Exploitation Industrielle des Tabacs et des Allumettes
InventorChristian Mainvielle
Life of this patent
Estimating the term…
Abstract
A device for gripping and transferring a fabric material such as a canvas sack or the wrapper of a bale is disclosed comprising a carriage movable on a rail and on which is mounted a gripping assembly. The gripping assembly includes a disc having engagement tines disposed thereon which is driven by a low torque motor. The operations of lowering the discs for engagement of the fabric, engagement and transfer of the fabric are integrated for sequential action.
Claims5
A device for engaging the fabric material of a sack-like or bale-like object comprising
- (a) a support,
- (b) at least a pair of gripping assemblies mounted on said support for independent reciprocal movement along the vertical axis, each of said assemblies comprising
- (i) a vertically shafted, reversible, low torque motor,
- (ii) a gripping disc disposed on the shaft of said motor, and
- (iii) at least one tine disposed on said gripping disc offset from the axis of rotation of said shaft and operable to pierce and engage fabric material upon rotation of said motor and disc in a first rotational direction,
- (c) means operable to lower each of said gripping assemblies independently until each has made contact with the fabric to be engaged,
- (d) means operable to energize each of said motors for rotation in said first direction when all of said gripping assemblies have made contact with said fabric, said motors in each pair of gripping assemblies being energized for opposing rotation,
- (e) means responsive to the tension created within the fabric engaged between the gripping assemblies upon their opposing rotation and operable to terminate rotation at a predetermined tension valve,
- (f) means operable to raise said gripping assemblies when said predetermined tension is reached, and
- (g) means operable to energize and reverse each of said motors to relieve said tension and disengage said fabric.
7 more elements
Dependencies are inferred from the claim text.