Typewriting machines – Sheet or web – Including feed of plural record-media arranged side-by-side
Patent
1997-01-22
1998-08-11
Hilten, John S.
Typewriting machines
Sheet or web
Including feed of plural record-media arranged side-by-side
400616, 4006162, B41J 1150
Patent
active
057917949
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a paper transport for a printer station, and in particularly to a pin construction for engaging perforations along edges of continuous paper.
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 medium 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.
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.
In electrographic continuous printers, tractor drives serve the purpose of conducting the paper web with tangential contact via a transfer printing saddle to a photoconductive drum in order to transfer toner images from the photoconductive drum onto the paper web in the transfer printing region. To this end, the paper web lies taut against the photoconductive drum at the location of the transfer printing. The paper web is conveyed with feed crawlers arranged preceding and following the transfer printing saddle.
Continuous stock
REFERENCES:
patent: 4974979 (1990-12-01), Cardenas
K. Sanders, "Two-Path Electrophotographic Print Process", IBM Technical Disclosure Bulletin, vol. 22, No. 6, Nov. 1979.
Klapettek Gerhard
Kopp Walter
Puritscher Ernst
Hilten John S.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
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