Joints and connections – Structurally installed in diverse art device
Patent
1988-10-18
1990-02-20
Reese, Randolph A.
Joints and connections
Structurally installed in diverse art device
403 31, 403322, 403330, 24603, 358 49, F16D 3306
Patent
active
049021567
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a mechanism for mounting image cylinders in drum scanners.
In drum scanners, the images to be scanned are consistently secured as diapositives on the outside surface of a clear, transparent cylinder, what is referred to as the image cylinder. A light source that is axially entrained in the inside of the cylinder transirradiates the image when the latter is scanned line-by-line by the interaction of rotatory motion of the cylinder and axial feed motion of the outside-guided scan element in the form of a helix having a slight slope.
The entrainment of the light source situated in the cylinder would be rather complicated if the image cylinder were seated at both sides. For the purpose of short set-up times (standstill times), it is also desirable to prepare image cylinders in alternation outside of the scanner, i.e. to glue the diapositives on with precise location and, as warranted, to also already calculate adjustment values for the scanner in advance and to then mount the cylinder prepared in this way with a correspondingly fashioned mounting device so that it runs precisely round.
The object of the present invention is to specify a mounting device for image cylinders that accepts the cylinders cantilevered and clamps them firmly and running exactly round regardless of the dexterity of the operator. Height centering and gyratory centering are thereby strictly separated from one another.
The invention achieves this with the means recited in claim 1. Advantageous developments are recited in the subclaims.
The invention shall be set forth in greater detail below with reference to FIGS. 1 through 3.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal cross sectional view with portions in elevation of a and clamping device of the present invention with a partially joined image cylinder;
FIG. 2 is a longitudinal cross sectional view of the clamping device of FIG. 1 with a clamped image cylinder;
FIG. 3 is a longitudinal cross sectional view of a modification of the clamping device of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A shaft 1 that belongs to the apparatus is seated in the housing 3 of the apparatus with bearings 2 and with further bearings that are not shown here. The end of the shaft 1 is fashioned as a radial flange 4. A cone 5 that runs exactly centrally is worked in at the outermost end of the shaft butt end. The shaft 1 is bored hollow and the bore 6 can be connected to a vacuum pump via an electrically actuated valve that is not shown here. Three bearing blocks 7 that are uniformly distributed over the circumference are applied to the flange 4, clamping levers 8 being seated in these bearing blocks 7 with eccentric shafts 9.
Levers or lever arms 10 that are connected to slides 12 in articulated fashion via couplers 11 are also put in place on the eccentric shafts. The clamping levers 8 comprise link guides 13 into which pins 14 set into the slides 12 engage. The ends of the clamping levers 8 comprise hook-shaped clamping claws or jaws 15. The slides 12 are guided with slots 16 on pins 16a that are set into the flange 4. At the right-hand end, the slides 12 are connected with piston rods 17 to the pistons 18 of three pneumatic cylinders 18 attached to the shaft 1. The cylinder chambers situated at the right of the piston 18 are in communication with the bore 6 in the shaft 1 via bores 20. Compression springs 21 press the pistons into their left-hand final position when no under-pressure or vacuum is applied.
Three preferably hardened seating surfaces 22 are set into the flange 4, the end faces of these seating surfaces 22 running precisely centrally relative to the bearing of the shaft 1, this, for example, being capable of being effected by final working (grinding) after assembly.
An axially displaceable sensing ring 23 is put in place on the flange 4 at the outside, this sensing ring 23 being held in its left-hand final position by compression springs 24. As shall be shown later, it interacts with three proximity switches 25 that are arrange
REFERENCES:
patent: 1794633 (1931-03-01), Delany
patent: 2361763 (1944-10-01), Goddard
patent: 2657259 (1953-10-01), Hachenberg
patent: 3142102 (1964-07-01), Saunders
patent: 3738693 (1973-06-01), Loustalet
patent: 4227825 (1980-10-01), Oesterle
patent: 4833760 (1989-05-01), Sundstrom
Kosov "Mechanized Machine Tool Fixtures", Machines and Tooling, vol. 34, No. 9, 1963, pp. 28-31.
Balzeit Ralf
Deisler Manfred
Dinse Wolfgang
Gesell Reinhard
Lassen Bernd
Bordas Carol I.
Dipl. Ing. Rudolf Hell GmbH
Reese Randolph A.
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