Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1997-01-22
1998-10-20
Reinhart, Mark J.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347153, B41J 247
Patent
active
058254056
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a paper transport for a printing station, and more particularly to an arrangement of pins for engaging into edge perforations of continuous paper to move the paper through the printer.
2. Description of the Related Art
It is standard to employ what is referred to as a tractor drive for the transport of margin-perforated recording media in the region of the transfer printing station of electrographic printer devices. Such a tractor drive is disclosed, for example, by German patent document DE-C2-3307583. The known tractor drive contains a toothed belt that runs over a drive pulley and a deflection pulley. Dog pins that engage into the margin perforations of the recording medium for transporting the band-shaped recording medium are mounted laterally at the toothed belt via holders.
So that the dog pins can easily enter into the perforation holes and slide therefrom in turn during the rotation of the pulleys, it was also proposed according to the illustration of FIG. 2 to guide the recording medium 10 under the neutral fiber 30 of the belt 26.
An electrographic printer device disclosed in the earlier European Patent Application 93108219.2 is designed for printing band-shaped recording media with different band widths in different operating modes such as single-color and multicolor simplex printing, single-color and multicolor duplex printing and for simultaneously printing two recording medium webs in parallel operation. To this end, the units of the printer device such as an intermediate carrier, a transfer printing station and fixing station have a usable width of at least twice the band width of a narrow recording medium. The printer device also contains a deflection means that follows the fixing station that can be connected in as needed and that has an allocated return channel to the transfer printing station via which the recording media can be turned over in single-color or multicolor duplex mode and resupplied to the transfer printing station.
Due to the employment of two recording medium webs in the parallel operation, two tractor drives must be arranged parallel next to one another in the region of the transfer printing station. Since the transfer printing region, including the transfer corotron, extends continuously over two recording medium webs, it is necessary to keep the unusable gap between the recording medium webs and, thus, between the tractor drives optimally small. A lateral arrangement of the dog pins next to the belt according to the illustration of FIG. 2 would enlarge the gap.
When, according to the illustration of FIG. 3, however, the dog pins are arranged on the outer circumferential surface of the belt, the recording medium is at a great distance from the neutral fiber. The spacing of the dog pins thus varies considerably when rolling over the pulley, this leading to damage to the perforation holes.
The European patent document EP-A2-0 391 693 discloses a tractor drive with a toothed belt having pins centrally arranged thereon for a margin-perforated recording medium in an impact printer via which a single recording medium web is conveyed through the printer. A ramp that lowers the toothed belt and, thus, the pins comprising a collar and a conically tapering tip relative to the recording medium before the pulley is arranged between the actual transport region and a pulley that drives the toothed belt. Upon rotation around the pulley, the pins thus glide from the transport holes without damaging them.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a transfer printing station for an electrographic printer device that makes it possible to convey two parallel recording medium webs composed of recording media provided with margin perforations arranged in close proximity next to one another through the transfer printing station and print them in parallel. The transfer printing station should thereby be able to reliably process recording media of different t
REFERENCES:
patent: 4494855 (1985-01-01), Colwill
patent: 4974979 (1990-12-01), Cardenas
patent: 5018887 (1991-05-01), McCray et al.
K. Sanders, "Two-Path Electrophotographic Print Process", IBM Technical Disclosure Bulletin, vol. 22, No. 6, Nov. 1979.
Japanese Abstract, vol. 10, No. 70, (M-462), Mar. 19, 1986, 60-214980, Oct. 28, 1985.
Klapettek Gerhard
Puritscher Ernst
Oce Printing Systems GmbH
Reinhart Mark J.
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