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公开(公告)号：IT1165404B
公开(公告)日：1987-04-22
申请号：IT2824379
申请日：1979-12-20
Applicant: IBM
Inventor： SIENKIEWICZ GERALD CARL , MCQUADE DONALD JOSEPH , LEONARD HERBERT GENE
Abstract: A freely rotatable spool having an endless loop of printer ribbon wound around it is disclosed. The ribbon is withdrawn from the inner periphery of the coil and is simultaneously wound onto the outer periphery of the coil in a known manner. The freely rotatable spool is driven by the forces applied through pulling the ribbon off the inner periphery. Ribbon pulling is performed by an external set of feed rollers or similar mechanism. Difficulties encountered with the use of fabric ribbons in endless reel configurations are eliminated in the present invention by an improvement in the form of a polygonally shaped flange on the upper side of the freely rotatable spool on which the ribbon is wound. The flat sides on the polygonal flange have an optimum length which is defined in relationship to the width of the ribbon and the cosine of the angle at which the ribbon is withdrawn from the spool. An undercut dimension is provided on the spool so that the inner periphery of the ribbon is not in too great a contact with the hub or central core of the spool. A smooth ribbon flow from the vertical plane on the inner periphery of the coil to the horizontal plane as the ribbon is pulled from the center of the coil and out through the cassette is obtained.
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公开(公告)号：DE2965591D1
公开(公告)日：1983-07-07
申请号：DE2965591
申请日：1979-12-04
Applicant: IBM
Abstract: A freely rotatable spool having an endless loop of printer ribbon wound around it is disclosed. The ribbon is withdrawn from the inner periphery of the coil and is simultaneously wound onto the outer periphery of the coil in a known manner. The freely rotatable spool is driven by the forces applied through pulling the ribbon off the inner periphery. Ribbon pulling is performed by an external set of feed rollers or similar mechanism. Difficulties encountered with the use of fabric ribbons in endless reel configurations are eliminated in the present invention by an improvement in the form of a polygonally shaped flange on the upper side of the freely rotatable spool on which the ribbon is wound. The flat sides on the polygonal flange have an optimum length which is defined in relationship to the width of the ribbon and the cosine of the angle at which the ribbon is withdrawn from the spool. An undercut dimension is provided on the spool so that the inner periphery of the ribbon is not in too great a contact with the hub or central core of the spool. A smooth ribbon flow from the vertical plane on the inner periphery of the coil to the horizontal plane as the ribbon is pulled from the center of the coil and out through the cassette is obtained.
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公开(公告)号：DE69615261D1
公开(公告)日：2001-10-25
申请号：DE69615261
申请日：1996-04-04
Applicant: IBM
Inventor： CROMPTON DENNIS , HARRIS RICHARD HUNTER , LEONARD HERBERT GENE , HUFFORD III , THOMAS JEFF DAVID
Abstract: A tilt adjustment mechanism having an upper housing (11), a lower housing (13) and a shaft assembly is disclosed. The shaft assembly receives the gears (17A,17B) which are pressed on either end of shaft (19). The shaft (19) fits through locating slots in the lower housing. Each of the gears (17A,17B) are activated by internal gears (23A) located on each side of the upper housing (11). The internal (23A) gears are integrally formed with the upper housing (11). The upper housing (11) is hinged on the lower housing (13) and can rotate 20 degrees. The shaft assembly mechanism provides a torsion bar function to insure that the upper housing (11) moves evenly with respect to the lower housing (13). Even motion in the upwards and downwards directions of the housing is provided by even rotational torsional motion and opposite rotational torsional motion of the shaft assembly of the tilt adjustment mechanism. The shaft assembly mechanism decouples the frictional load in the two different rotational directions about its shaft. This permits the adjustment of the forces to optimal levels in both directions. A relatively high force is desired to move the upper housing in a downward direction. This prevents the operator's touches on a display tablet, mounted to the upper housing to cause the tilt adjustment mechanism to move in the downward direction. A relatively low force is required to move the tilt adjustment mechanism in the upwards direction.
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