Eastman-kodak Company

Robert I Edelman

Robert A Sylvester

Corrado Zollo

Willis L Stockdale

William B Vreeland

Marcus Stephen Bermel

David J Ellingham

A transfer member, for example, a transfer drum utilizes a vacuum applied through vacuum openings to the drum surface for holding a receiving sheet. A toner image is transferred to the sheet under the urging of an electric field. The vacuum openings are made small enough to prevent a visible artifact caused by nontransfer of toner in the vicinity of the opening but large enough to still maintain a vacuum contributing to the holding force of the sheet. According to a preferred embodiment, larger vacuum holes are formed in the drum and a conductive insert defining or helping define small vacuum openings is inserted in each vacuum hole. The insert maintains the continuity of the electric field in the hole region, but its geometry provides the small openings to maintain the vacuum. The invention is particularly useful in apparatus in which more than one color toner image is transferred in registry to the receiving sheet.

Transfer apparatus having a transfer member with vacuum means

A wound roll of filmstrip of the type having a photographic emulsion layer on one strip face and a raised stripe disposed along one edge of the opposite strip face is so formed as to produce temporary adhesion between the stripe of one convolution and the emulsion layer of an adjacent convolution. Such adhesion or tacking, restricts relative movement of the convolutions, thereby avoiding effective axial expansion of the roll and the resultant generation of undue frictional forces during advancement of the strip through a cartridge in which it is housed. Such tacking may be achieved by forming the strip into a roll and by so applying energy to a flat end face of the roll as to cause localized melting of the emulsion layer of one convolution at its interface with the raised stripe of an adjacent convolution, whereupon subsequent cooling and rehardening of the emulsion produces adhesion of the convolutions at such interface. In a preferred method of practicing such invention, a wound but untacked roll is supported at one end face by a wall of an unassembled cartridge body and is positioned beneath a movable heating platen. When the platen is placed in contact with the opposite end face of the roll, a desired quantum of heat may be transferred to the wound strip to produce the above-mentioned melting and the resulting tack.

Tacked film roll and method of making same

A wound roll of filmstrip of the type having a photographic emulsion layer on one strip face and a raised stripe disposed along one edge of the opposite strip face is so formed as to produce temporary adhesion between the stripe of one convolution and the emulsion layer of an adjacent convolution. Such adhesion or tacking, restricts relative movement of the convolutions, thereby avoiding effective axial expansion of the roll and the resultant generation of undue frictional forces during advancement of the strip through a cartridge in which is is housed. Such tacking may be achieved by forming the strip into a roll and by so applying energy to a flat end face of the roll as to cause localized melting of the emulsion layer of one convolution at its interface with the raised stripe of an adjacent convolution, whereupon subsequent cooling and rehardening of the emulsion produces adhesion of the convolutions at such interface. In a preferred method of practicing such invention, a wound but untacked roll is supported at one end face by a wall of an unassembled cartridge body and is positioned beneath a movable heating platen. When the platen is placed in contact with the opposite end face of the roll, a desired quantum of heat may be transferred to the wound strip to produce the above-mentioned melting and the resultant tack.

Growing community of inventors

Rochester, NY, United States of America

Robert I Edelman