Typewriting machines – Sheet or web – For feeding web record-medium
Utility Patent
1998-07-20
2001-01-02
Hilten, John S. (Department: 2854)
Typewriting machines
Sheet or web
For feeding web record-medium
C400S616000
Utility Patent
active
06168332
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a transfer printing station for a printer or copier device, for accepting one or more recording media webs such as paper that are of different widths and that comprise strip-type edge perforations, said media webs being driven via a transport means that engages in the edge perforations.
BACKGROUND OF THE INVENTION
Transfer printing stations are known. For example, see WO 94/27193. For the adapting of the transport means to various recording media widths, the known transport means can be fashioned so as to be adjustable in width. This can be achieved for example in that the drive wheels, which carry the transport strips (nap strips) that engage in the edge perforations of the recording medium, are movably mounted on polygonal shafts.
In order to guide two narrow recording media next to one another in parallel operation on both sides in the area of the transfer printing station, separate transport elements can be arranged in the center that engage in edge perforations of the recording media. In order to prevent these transport elements from having a disturbing effect during operation with a recording medium only one width, they can be arranged so as to be attachable and detachable, or so that they can be pivoted away, or else it is possible to provide the drive wheels of the transport means with pins or, respectively, naps that can be extended and retracted.
All proposed solutions for the width-adaptable construction of the transport means are expensive, difficult to handle, and require a great deal of space.
SUMMARY OF THE INVENTION
It is thus the object of the invention to construct a transfer printing station of the type named above in such a way that it can be adapted in a simple, user friendly way to the various operating states with various recording media widths.
In an embodiment, the present invention provides a transfer printing station for conveying either a single wide paper web or two narrower paper webs or one narrower paper web. Each paper web has opposing edges with perforations disposed therein for engaging tractor drives. The transfer printing station of the present invention comprises at least one drive shaft that passes through two pairs of tractor drives including a first tractor drive pair including a first tractor drive and a second tractor drive and a second tractor drive pair including a third pair tractor drive and a fourth tractor drive.
The second tractor drive is disposed along the drive shaft between the first and third tractor drives. The third tractor drive is disposed along the drive shaft between the second and fourth tractor drives. Each pair of tractor drives engages preforations in opposing edges of one of the paper webs. The second tractor drive is slidable along the drive shaft towards and away from the first tractor drive. Both the third and fourth tractor drives are slidable along the drive shaft towards and away from each other and away from the first and second tractor drives to a distal park region of the drive shaft which enables the second tractor drive to be moved away from the first tractor drive for accomodating a single wide paper web.
In an embodiment, the transfer printing station further comprises a first control shaft threadably coupled to the third tractor drive whereby rotation of the first control shaft results in lateral movement of the third tractor drive along the drive shaft. The transfer printing station of the present invention also comprises a second control shaft threadably connected to the second tractor drive whereby rotation of the second control shaft results in lateral movement of the second tractor drive along the drive shaft. The first control shaft is connected to a first output part against rotation with respect to the first output part. The first output part comprises a catch gearing for engaging a rotational drive element. Further, the first control shaft passes through a second output part so that the first control shaft is free to rotate within the second output part without imparting rotation to the second output part.
However, the second output part comprises a catch gearing for engaging the drive element. The second output part is coupled to a carrier part that is connected to the second control shaft against rotation with respect to the second control shaft. The drive element is movable between the catch gearing of the first output part and the catch gearing of the second output part. When the drive element engages the catch gearing of the first output part, rotation of the drive element results in rotation of the first output part, the first control shaft and the third tractor drive thereby resulting in lateral movement of the third tractor drive along the drive shaft. When the drive element engages the catch gearing of the second output part, rotation of the drive element results in rotation of the second output part, the carrier part, the second control shaft and the second tractor drive thereby resulting in lateral movement of the second tractor drive along the drive shaft.
In an embodiment, the second output part is enmeshed with a ring gear, the ring gear being enmeshed with the carrier part.
In an embodiment, the drive element is slidably mounted to the first control shaft and is movable along the first control shaft between engagement with the catch gearing of the first output part and the catch gearing of the second output part.
In an embodiment, the first output part comprises a magnet for securing the drive element against the first output part when the drive element is moved into engagement with the first output part for imparting rotational movement to the first output part.
In an embodiment, the second output part further comprises a magnet for securing the drive element against the second output part when the drive element is moved into engagement with the second output part for imparting rotational movement to the second output part.
In an embodiment, the drive element comprises a handle for imparting rotation to the drive element.
In an embodiment, the transfer printing station further comprises a frame with a catch pin being mounted to the frame at selected positions along the frame. The catch pin engages the fourth tractor drive for securing the fourth tractor drive in position during operation of the transfer printing station.
In an embodiment, the transfer printing station further comprises a brake element disposed between the carrier part and the second control shaft to prevent rotation of the second control shaft with respect to the carrier part during operation of the printing station.
In an embodiment, the transfer printing station further comprises a brake element disposed between the second output part and the first control shaft to prevent rotation of the first control shaft with respect to the second output part during operation of the printing station.
In an embodiment, the brake elements are plate springs.
In an embodiment, the first control shaft is threadably connected to the third tractor drive by a threaded bushing.
In an embodiment, the second control shaft is threadably connected to the second tractor drive by a threaded bushing.
In an embodiment, the transfer printing station further comprises an adjustment rule or ruler disposed parallel to the drive shaft.
In an embodiment, the second output part comprises a toothed wheel and the carrier part comprises a toothed wheel enmeshed with the second output part.
The invention makes it possible in a simple way to adapt, with different widths, the transfer printing station to the various operating states, such as operation with a paper web of only one width or operation with two parallel narrow paper webs. For this purpose, the transfer printing station contains two tractor drive pairs that are arranged movably next to one another on a drive shaft. In operation a paper web of one width, the tractor drive of the unneeded tractor drive pair is moved into a lateral park position. In all operational states, a simple and exact width matching of the tractor drives to various p
Hofler Adolf
Puritscher Ernst
Windele Josef
Hill & Simpson
Hilten John S.
Nguyen Anthony H.
Oce Printing Systems GmbH
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