by: Sampson, Rudy; Deman, Stefaan; Defever, Serge; Chys, Marc; Michiels, Christophe; Feys, Jozef; Staelens, Patrick;

Color proofer with registering means

A printing apparatus is described for two-sided colour proofing with improved registering of front- and back-side images. Improved registering is performed by: web feeding device with de-curling system tumbler unit for turning the receiving medium alignment sensing and correction system.






What is claimed is:

1. A printing apparatus comprising

a print unit having a print head for printing an image on a receiving medium;

medium supply means for feeding said receiving medium to said print unit

a medium alignment system having

at least one alignment sensor for determining the alignment of said receiving medium in said print unit;

an alignment correction system for correcting said alignment;

a tumbler unit coupled to said print unit, for reversing said receiving medium, comprising pinch rollers each for forming a nip with a corresponding drive roller;

wherein said tumbler unit further has means for changing the orientation of said nip thereby reversing said receiving medium.

2. The apparatus according to claim 1 wherein said alignment correction system comprises at least two drive roller for independently driving said receiving medium.

3. The apparatus according to claim 2 wherein said alignment correction system is located inside said tumbler unit.

4. The apparatus according to claim 2 wherein said corresponding drive rollers serve as drive rollers for said alignment correction system.

5. The apparatus according to claim 1 wherein said pinch rollers are on a rotatable platform and the tumbler unit has means for locking the rotatable platform at different positions.

6. The apparatus according to claim 5 further comprising locking means for coupling said rotatable platform to at least one of said drive rollers providing synchronous rotation of said rotatable platform with said drive roller.

7. The apparatus according to claim 1 wherein said medium supply means is a device for feeding a medium from a roll, said device comprising a de-curling roller.

8. Method for printing images on a front and back side of a receiving medium comprising the steps of:

feeding the receiving medium to a print unit having a print head;

printing a first image on said front-side using said print head;

feeding the receiving medium between pinch rollers and corresponding drive rollers inside a tumbler unit, each pinch roller and corresponding drive roller forming a nip;

reversing said receiving medium in said tumbler unit by changing the orientation of said nip;

re-feeding said receiving medium to said print unit;

sensing the alignment of said receiving medium by at least one alignment sensor;

correcting said alignment of said receiver medium prior to printing said image on said back-side;

printing a second image on the back-side using said print head.

9. The method of claim 8, wherein the re-feeding of the receiving medium is done in a stepwise manner removing receiving medium buckle during backward stepping.


logo
Keypad scanning security system

Automobile window shield and covering

Air-fuel ratio controller

Cleaning apparatus for disk-shaped workpieces

Spa cover lift

Image recording apparatus

Tubular grafts from purified submucosa

High-pressure discharge lamp

Memory protection circuit

Desulfurizing fossil fuels

Flexible textile spindle assembly

Synchronous coupling

Modified asphalt hydraulic sealer

Distributed crossbar switch architecture

Locking hole punch

Positioning controller

Electrical circuit tester

Tape tensioning apparatus

Bottom for planing boats

Primer compositions

Golf course

Tape measure

High voltage cut-off semiconductor device

Tube couplings

Certain 5,6-dihydro-prostacyclin analogs

Device for use in diagnosis

Lifting mechanism

Handle bag of plastic film

Inorganic binders employing waste glass

Method for producing resist structures

Cuvette rail

Structure of angular rate sensor

Method of making field emitters

Cosmetic firming formulation

Electrophotographic image forming apparatus

Foreign matter detecting device

Signal reproducing circuit

Power source device

Article comprising microcavity light sources

Shielded cable cutting device

Vacuum assembly for wire unwrapper

Compound machining apparatus

Tricyclic 5-HT.sub.3 receptor antagonists

Photographic camera

Hand wrap multilayer film products

Catalyst combustion device

Energy efficient domestic refrigeration system

Memory access optimizing method

Tipping rack for bottle

Card holding device

Bis(alkyleneoxybenzophenone) ultraviolet light absorbers

Thermosetting powdery coating composition

Rapid exit herringbone stall

Yarn texturing nozzle

Phase shift demodulator

Tapered electrode for stacked capacitors

Compressible packages for infusible substances

Apparatus for opening envelopes

Nozzle inner radius inspection system

Dipyrromethene metal chelate compounds

Calibration of magnetic tape drive

Compact electric asymmetry brake

Wireless control device

Ophthalmic device for dispensing eyedrops

Sewing machine

Process for separating dichlorocumene isomer

Suspension mechanism for tracked vehicles

Dental post system

Statistical weighing

Electrophotographic x-ray device

Coating composition for artistic reproductions

Withstand-voltage tire

Mouse support

Diet control device and method

Polymerization of olefin

Power operated toothbrush

Step controller

Bearing play adjusting assembly

Internal combustion engine

Bandanna for pets

Panel-form loudspeaker

Surveillance system and method

Display device

Iodine adsorbent

Recompression staged evaporation system

High-temperature, non-catalytic, infrared heater

Hydraulically operated engine valve system