Printing – Stenciling – Rotary machines
Patent
1989-02-02
1991-02-05
Crowder, Clifford D.
Printing
Stenciling
Rotary machines
118262, B41F 1544
Patent
active
049895095
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a device for the application of fluid substances in printing and coating machines, and more particularly to such a device which includes carrying plates which are attached to a carrying beam and which include recesses therein within which pivot axles of a magnetic application roller are loosely rotatably disposed.
In known devices of this type, an application roller (or ductor roller) is caused to press against a fabric strip, which is to be imprinted, by a magnetic beam arranged below the fabric strip. The carrying plates of such a roller should prevent unintentional deviation of the roller from its desired direction and allow for removal of the roller from the carrying plates.
An important advantage obtained by magnetically causing a ductor roller to press against the fabric strip is that essentially no forces are introduced at the ends of the roller so that no deflection of the roller occurs. In order to assure this advantage, the carrying plates provided are not designed as bearings which fix the position of the pivot axles, but as a type of cage which limits the amount which the roller can deviate from its normal position in the horizontal plane and which allows the roller to be removed from the carrying plates. Because the roller, in this arrangement, is allowed to move somewhat in the horizontal plane, the roller may become slanted relative to its normal position transverse of the running direction of the fabric strip. Such slanting of the roller may cause operational problems. For example, slanting of the roller while it is rotating will cause it to shift in the axial direction and thus cause its pivot axles to bear against stopping surfaces provided on either side of the rollers to limit the crosswise movement of the roller. This leads to wear of both the stopping surfaces and the pivot axles.
In addition, in some prior art fluid substance applying machines such as those described above, and in particular in rotary screen printing machines, the carrying beam is used for supplying the fluid substance to the working area. Because the carrying beam usually has a relatively large diameter, upon changing color or performing maintenance work on the device, there is a considerable loss of the fluid substance.
SUMMARY OF THE INVENTION
Among the objects of the present invention are to avoid the described disadvantages of the prior art devices, and to provide for ease, safety and economy of operation of a device for applying fluid substance.
According to the invention, the objects are fulfilled by providing an apparatus for the application of fluid substances in printing and coating machines, comprising: a carrying beam having first and second ends; first and second carrying plates attached respectively to said first and second ends of said carrying beam and having first and second recesses formed therein; a rotatable application roller; mounting means, comprising first and second pivot axles extending through said first and second recesses, respectively, for mounting said roller to said first and second carrying plates for rotation with respect to said first and second carrying plates; and first and second stopping means for abutting with an end of each of said first and second pivot axles, respectively, to allow some axial movement of said roller but limit the axial movement of said roller in each respective axial direction thereof. In addition each of said first and second stopping means includes a stopping surface which is disposed at an oblique angle relative to the common pivot axis of the first and second pivot axles. These angled stopping surfaces provide simple means to cause the roller, when in a slanted position, to return to its regular position transverse to the direction in which the fabric strip is moved. This occurs because, when the roller is slanted, it will shift axially, bear against one of the angled stopping surfaces and be returned to its transverse position due to the angular orientation of the stopping surface.
The carrying plat
REFERENCES:
patent: 628651 (1899-07-01), Cummings
patent: 3965816 (1976-06-01), Mitter
patent: 3988986 (1976-11-01), Zimmer
patent: 4216716 (1980-08-01), Zimmer
patent: 4417515 (1983-11-01), Mitter
patent: 4453462 (1984-06-01), Mitter
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