Sheet clamping device
AssigneeRicoh Company, Ltd.
InventorToshifumi Kato
Life of this patent
Estimating the term…
Abstract
A sheet clamping device is provided which is used to clamp both the leading and the trailing end of a sheet while the sheet is being disposed around the peripheral surface of a drum rotating in a given direction. The drum is provided with a front and a rear claw which are adapted to clamp the leading and the trailing end of the sheet, respectively, and which are urged to bear against the peripheral surface of the drum. The claws are operated to open or close in response to respective claw operating means. After a sheet has its leading end clamped to the drum surface by means of the front claw, combing urges the sheet against the drum surface while combing it, and the trailing end of the sheet is clamped to the drum by means of the rear claw.
Claims31
A sheet clamping device comprising a drum around which a sheet is to be disposed, drum drive means for driving the drum for rotation in a given direction, first swingable clamping means extending outwardly of the drum through a slit formed in the drum along a generatrix thereof and being swingable between an open and a closed position relative to the drum surface for clamping the leading end of a sheet against the drum surface, operating means for selectively driving the clamping means to its open or closed position, second swingable clamping means extending outwardly of the drum through the slit formed in the drum and swingable between an open and closed position relative to the drum surface for clamping the trailing end of the sheet against the drum surface, second operating means for selectively driving the second clamping means to its open or closed position, and sheet combing means movable toward or away from the drum surface for urging the sheet against the drum surface as the sheet is being disposed around the drum, in which the drum is associated with directing means for detecting the rotational position of the durm, and brake means for applying a braking effort to the drum as it rotates, and wherein the first clamping means is adapted to be brought to a stop at a third location which is lagging behind a first location where a sheet clamping operation for the leading end of the sheet is initiated and which leads a second location where a sheet clamping operation for the leading end of the sheet is completed.
A sheet clamping device comprising a drum around which a sheet is to be disposed, drum drive means for driving the drum for rotation in a given direction, first swingable clamping means extending outwardly of the drum through a slit formed in the drum along a generatrix thereof and being swingable between an open and a closed position relative to the drum surface for clamping the leading end of a sheet against the drum surface, operating means for selectively driving the clamping means to its open or closed position, second swingable clamping means extending outwardly of the drum through the slit formed in the drum and swingable between an open and a closed position relative to the drum surface for clamping the trailing end of the sheet against the drum surface, second operating means for selectively driving the second clamping means to its open or closed position, sheet combing means movable toward or away from the drum surface for urging the sheet against the drum surface as the sheet is being disposed around the drum, and load means serving to assure the rotational speed of the drum remains constant during actuation of said first clamping means between its open and closed positions by varying the inertial load applied to the support shaft of the drum.
A sheet clamping device comprising a drum around which a sheet is to be disposed, drum drive means for driving the drum for rotation in a given direction, first swingable clamping means extending outwardly of the drum through a slit formed in the drum along a generatrix thereof and being swingable between an open and a closed position relative to the drum surface for clamping the leading end of a sheet against the drum surface, operating means for selectively driving the clamping means to its open or closed position, second swingable clamping means extending outwardly of the drum through the slit formed in the drum and swingable between an open and a closed position relative to the drum surface for clamping the trailing end of the sheet against the drum surface, second operating means for selectively driving the second clamping means to its open or closed position, and sheet combing means movable toward or away from the drum surface for urging the sheet against the drum surface as the sheet is being disposed around the drum, said sheet combing means including means contacting the sheet at at least two points spaced circumferentially of the drum for holding the sheet in place while its trailing edge enters the second swingable clamping means.
Dependencies are inferred from the claim text.