Electric heating – Metal heating – By arc
Patent
1986-08-28
1988-03-22
Albritton, C. L.
Electric heating
Metal heating
By arc
219121EJ, B23K 1500
Patent
active
047330465
DESCRIPTION:
BRIEF SUMMARY
In printing technology, particularly in rotogravure, engraved printing cylinders are employed for producing the printed products, these printing cylinders being clamped in the printing machines and being inked with the corresponding inks. The ink is transferred from the printing cylinder onto the material to be printed. U.S. Pat. Nos. 3,246,970 and 3,404,254 already disclose that printing cylinders for printing technology be engraved by means of a high-energy, focussed electron beam. Since a correspondingly focussed electron beam can only be generated in a vacuum, the electron beam exit from the electron beam generator and the printing cylinder to be engraved are situated in a vacuum vessel. Since these printing cylinders have considerable dimensions and must be placed in rotation and conducted axially past the beam for engraving, vacuum vessels which have more than twice the length of the printing cylinders and a diameter which is greater than that of the printing cylinder itself are required. Since the printing cylinders are introduced into such a vacuum chamber from the outside and the vacuum chamber is subsequently closed again, high demands are made of the vacuum chamber with respect to stability and tightness, since electron beam engraving can only occur in an adequately high vacuum.
Screw covers or covers restrained by means of individual screws are already known for sealing pressure vessels. Such covers, however, are not very user-friendly and, given the high mechanical strength required here, they have a correspondingly high weight and can only be removed or applied with corresponding lifting gear.
It is therefore the object of the present invention to create a pressure-tight vacuum chamber for the acceptance of printing cylinders for engraving printing cylinders by means of [an] electron beam which can be opened and closed in a simple way and which leads to low set-up times for the machine.
The invention achieves this by means of the features recited in the characterizing part of claim 1. Advantageous developments are recited in subclaims 2 through 11.
The invention shall be set forth in greater detail below with reference to FIGS. 1 through 12. Shown therein are:
FIG. 1 a perspective view of an electron beam engraving machine with closed cover;
FIG. 2 a perspective view of an electron beam engraving machine with opened cover;
FIG. 3 a cross-section through the vacuum vessel, the cover and the actuation mechanism in the closed condition of the cover;
FIG. 3a an excerpted drawing of the seal of the cover;
FIG. 4 a cross-sectional view in accord with FIG. 3 with lifted cover;
FIG. 5 a cross-sectional view in accord with FIG. 3 having a cover which has been partially displaced to the side;
FIG. 6 a cross-sectional view of FIG. 3 with opened cover in the final position;
FIG. 7 a perspective view of a further embodiment of the invention comprising a counterweight for the cover which is designed as a pendulum;
FIG. 8 the arrangement of FIG. 7 given a closed cover;
FIG. 9 the arrangement of FIG. 8 given a lifted annular rail;
FIG. 10 the arrangement of FIG. 9 given an opened cover;
FIG. 11 a cross-sectional view through a further modification of the invention comprising a lifter element as compensation means for the weight of the cover; and
FIG. 12 a cross-sectional view of a further modification of the invention comprising a spring and a cam plate as weight compensation for the cover.
FIG. 1 shows an electron beam printing form engraver 1 which comprises a pressure-tight vacuum vessel 2, i.e. a pressure chamber which is closed with a cover 3. A gravure cylinder (not shown) is introduced into the engraver 1 from the top through the cover opening 4 of FIG. 2. For opening the vessel, the cover 3 is lifted out of the opening 4 and is displaced into its open position by means of special conveying devices provided at its ends, these conveying devices to be shown and set forth in detail later. An electron beam gun 5 is flanged to the vacuum vessel in the central region of the engraver, the electron beam exit
REFERENCES:
patent: 3483351 (1969-12-01), Wood
patent: 3610872 (1971-10-01), Sciaky
Angelbeck Rolf
Gesell Reinhard
Penza Hans
Albritton C. L.
Dr. -Ing. Rudolf Hell GmbH
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