Back to results
US 6,606,475 B1Granted
Device for transferring a toner image from a toner support tape to a toner material while maintaining a constant tape tension
AssigneeOce Printing Systems GmbH
InventorsStefan Maier, Edmund Creutzmann, Joachim Samweber
Life of this patent
Estimating the term…
Abstract
A printer or copier has a toner transfer belt which is moved into an out of engagement with a transfer printing area. The toner transfer belt is carried on an arrangement of rollers that maintain a constant tension on the toner transfer belt. Rigid linking levers extend between the rollers of the roller arrangement so that belt tension is maintained by movement of compensation rollers, outward while moving a transfer roller upward, for example.
Claims14
A device for transferring a toner image onto a carrier material, comprising:
- a toner carrier belt which carries the toner image to be transferred and has a predetermined belt tension;
- a roller arrangement supporting said toner carrier belt;
- a belt drive guiding said toner carrier belt through said roller arrangement in a transfer printing area in which the toner image is transfer-printed onto the carrier material;
- and
- apparatus for moving said toner carrier belt between a first state close to the carrier material in the transfer printing area to transfer the toner image and a second state arranged at a predetermined distance from the carrier material in the transfer printing area to prevent a transfer of the toner image, a belt tension in said toner carrier belt being essentially the same in said first state and said second state;
- wherein said roller arrangement includes one single transfer printing roller which is moved back and forth at least approximately perpendicular given a change between said first and second states;
- said belt drive including a stationary roller with a stationary rotational axis at each of both sides of said transfer printing roller;
- said roller arrangement including a movable compensation roller arranged between each of said stationary rollers and said transfer printing roller;
- the respective distance between the rotational axes of the transfer printing roller and the compensation roller and the respective distance between the rotational axes of the compensation roller and the stationary roller remains constant in every state;
- and
- diameters of the transfer printing roller, the compensation rollers and of the stationary rollers being of the same size.
8 more elements
A device for transferring-a toner image onto a carrier material, comprising:
- a toner carrier belt which carries the toner image to be transferred and has a predetermined belt tension;
- a roller arrangement supporting said toner carrier belt;
- a belt drive guiding said toner carrier belt through said roller arrangement in a transfer printing area in which the toner image is transfer-printed onto the carrier material;
- and
- apparatus for moving said toner carrier belt between a first state close to the carrier material in the transfer printing area to transfer the toner image and a second state arranged at a predetermined distance from the carrier material in the transfer printing area to prevent a transfer of the toner image, a belt tension in said toner carrier belt being essentially the same in said first state and said second state;
- a rotating radial cam having a control surface operating to drive the roller device during its back and forth motion;
- and
- at least one compensation roller operating to move back and forth during rotation of said radial cam, a difference in length of a belt backlash given motion of the roller device being compensated by motion of the compensation roller;
- wherein the roller arrangement includes two transfer printing rollers which are simultaneously moved back and forth by said control surface of said radial cam,
- each transfer printing roller having one compensation roller allocated to it which is moved back and forth by said control surface of said radial cam.
7 more elements
A device for transferring a toner image onto a carrier material, comprising:
- a toner carrier belt which carries the toner image to be transferred and has a predetermined belt tension;
- a roller arrangement supporting said toner carrier belt;
- a belt drive guiding said toner carrier belt through said roller arrangement in a transfer printing area in which the toner image is transfer-printed onto the carrier material;
- and
- apparatus for moving said toner carrier belt between a first state close to the carrier material in the transfer printing area to transfer the toner image and a second state arranged at a predetermined distance from the carrier material in the transfer printing area to prevent a transfer of the toner image, a belt tension in said toner carrier belt being essentially the same in said first state and said second state;
- a guide bar defining a direction along which said roller arrangement is moved;
- a sliding piece which is moved back and forth on said guide bar;
- two tension rollers symmetrically arranged relative to said guide bar, said tension rollers being respectively connected by swivel arms to one end of said guide bar and by respectively one connecting rod to said sliding piece, and the tension rollers applying equal pressing forces against said toner carrier belt.
5 more elements
A device for transferring a toner image onto a carrier material, comprising:
- a toner carrier belt which carries the toner image to be transferred and has a predetermined belt tension;
- a roller arrangement supporting said toner carrier belt;
- a belt drive guiding said toner carrier belt through said roller arrangement in a transfer printing area in which the toner image is transfer-printed onto the carrier material;
- and
- apparatus for moving said toner carrier belt between a first state close to the carrier material in the transfer printing area to transfer the toner image and a second state arranged at a predetermined distance from the carrier material in the transfer printing area to prevent a transfer of the toner image, a belt tension in said toner carrier belt being essentially the same in said first state and said second state;
- wherein said belt drive has two stationarily arranged deviation rollers for said toner carrier belt at both sides symmetrically relative to a center line of a guide bar, and said deviation rollers are of equal diameter.
3 more elements
Dependencies are inferred from the claim text.