Printing – Special article machines – Bed and platen
Patent
1986-11-05
1988-02-09
Crowder, Clifford D.
Printing
Special article machines
Bed and platen
101163, 101170, B41F 1700
Patent
active
047234857
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a process for high-speed printing with tampons, printing blocks, and workpiece holders for the workpieces to be printed, where the workpieces are placed and held in the workpiece holders and where the tampons alternately receive printing images from the inked printing blocks and transfer them to the workpieces.
DESCRIPTION OF THE PRIOR ART
Tampon printing machines are known where the printing block and the workpiece rest when the printing image is received and when it is transferred. Here, the tampon is adjusted in a linear motion, in most cases in three directions. After the transfer of the printing image the workpiece holder also executes a linear motion so that a new workpiece holder with a workpiece can be brought to the printing position.
With these tampon printing machines known in the art the printing speed is limited to a few hundred prints per hour, since the mechanical linear control elements allow only limited regulating speeds for the tampon and the workpiece holders.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a process for high-speed tampon printing where the printing speed can be increased to a multiple of the prints.
According to the invention this object is achieved by synchronously moving the tampons, printing blocks, and workpieces respectively on an endless line, by arranging at least one section of the line with the tampons parallel to a section of the line with the printing blocks and at least one further section of the line with the tampons parallel to a section of the line with the workpieces, and by moving all of them in the same direction, and by alternately adjusting the tampons in the synchronous sections of the lines perpendicular to the corresponding sections and by bringing them into a position to interact--for a given travel path--with an inked printing block for receiving the printing image and with a workpiece for transferring the printing image.
The tampons, printing blocks, and workpiece holders with the workpieces can be moved along the endless lines at a considerably higher speed, and since printing is done by a brief lateral adjustment while the lines are moving, the printing cycles can be considerably increased, whereby a printing image can be received by a printing block in parallel with the transfer of a printing image to a workpiece and whereby several tampons, printing blocks, and workpiece holders can be arranged on the lines. This makes it possible to implement printing speeds which are far above the printing speed of the tampon printing machines with a resting printing block and a resting workpiece as they are known in the art. In addition, the design of the tampon printing machine for implementing the process is much simpler compared with the tampon printing machines known in the art.
If one embodiment provides that endless lines are configured as converyor belts, which are guided via deflection pulleys, that the tampons, printing blocks, and workpiece holders with the workpieces are arranged on the conveyor belts at an equal distance, and that the conveyor belts are moved continuously at a constant speed, then the drive of the conveyor belts is simplified and the sequence of motions can be easily synchronized.
According to one embodiment, optimum utilization of the time when the conveyor belts pass through the synchronous parallel sections for receiving the printing image and for transferring the printing image is achieved by adjusting the tampons perpendicular to the synchronous sections of the conveyor belts during the continuous run of the conveyor belts for a period of time which is coordinated with the period of time the conveyor belts take to pass through the synchronous sections.
If a further embodiment provides that the conveyor belts with the tampons, the printing blocks, and the workpiece holders are configured and driven the same way, that two tampons, two printing blocks, and two workpiece holders are provided which are spaced at a distance which is set by half
REFERENCES:
patent: 2645870 (1953-07-01), Smith et al.
patent: 3299804 (1967-01-01), Schueler
patent: 3418926 (1968-12-01), Hakogi
patent: 3587455 (1971-06-01), Childress et al.
patent: 3641930 (1972-02-01), Riddington
patent: 3990364 (1976-11-01), Paans
patent: 4414892 (1983-11-01), Strafello
Berberich Bernd
Mieding Gunter
Crowder Clifford D.
Speckman Ann W.
Speckman Thomas W.
TAMPOflex GmbH
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