X-ray or gamma ray systems or devices – Photographic detector support – For movable film or plate
Patent
1991-12-20
1993-10-19
Porta, David P.
X-ray or gamma ray systems or devices
Photographic detector support
For movable film or plate
378170, 378187, G03B 4202
Patent
active
052553043
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for centering X-ray film cassettes of various sizes, which can be transported on rollers, by means of two parallel bars movable towards and away from each other, respectively, in a cassette loading and unloading apparatus.
From U.S.Pat. No. 3 150 236, a centering device of the above type is known, which comprises a first crank disk pneumatically movable to and fro, and a second crank disk operatively connected to the first disk and rotatable in the opposite direction. Both crank disks are arranged on the housing bottom of the cassette loading and unloading apparatus. Each disk is seated on a spindle mounted in the housing bottom and extending upwardly at right angles. The free ends of the spindles are mounted in projections which are provided on the apparatus and are located at the left and at the right side of the roller arrangement. Each spindle is associated with an abutment ledge arranged above bars which are parallely pivotable above the rollers.
The known centering device is disadvantageous because the pneumatic crank disk is arranged on the housing bottom of the apparatus. Therefore, two very long spindles are required which extend from the bottom up to that part of the cassette loading and unloading station which carries the rollers in order to actuate the device which is arranged above said rollers and moves the bars towards and away from each other. Besides, the spindles which are arranged in the apparatus in an upright position have to be mounted accurately. Moreover, this centering device comprises numerous movable parts so that a lot of time is needed for their assembly . Furthermore, the bars are very thin and short so that large cassettes cannot be guided and centered safely enough.
It is the object of the invention to overcome the aforementioned disadvantages in a centering device for X-ray film cassettes of the above type and to design a compact centering device which can be manufactured easily and operates reliably.
In accordance with the invention, this object is attained in that each of the bars is arranged and designed such that the rollers penetrate them.
In detail, the invention is embodied such that each of the bars has a U-shaped recess for passage of the rollers and that lugs are provided between said recesses, at least one of said lugs resting on a guide rail below the rollers so as to be slidable thereon. Moreover, another lug of each bar is in engagement with a driving mechanism.
In an advantageous modification of the invention, at least the lugs guided on the rail as well as the lugs which are in engagement with the driving mechanism have bent-off portions at their ends.
In a further advantageous modification of the invention, the bent-off portions of the bars are designed on adjacent lugs.
In another advantageous modification, the rollers are horizontally mounted on a support plate.
In yet another advantageous modification, the driving mechanism of both bars is formed by two toothed belts circulating below the rollers in opposite directions.
In a further advantageous modification, the two circulating toothed belts extend horizontally from the center of the support plate towards the bars.
Advantageously, the rollers, the guide rail and the bars are arranged at the upper side of the support plate whereas the driving mechanism is arranged at the lower side of said plate, these parts jointly forming a prefinished assembly unit.
The invention is advantageous in that the prefinished assembly unit requires only relatively little space and is accessible from all sides, can be easily inserted into a cassette loading and unloading apparatus, locked and removed again as a complete unit for repair or cleaning.
Other features and advantages can be inferred from the description of an embodiment illustrated in the drawing, and from the subclaims.
In the drawing FIG. 1 is a plan view of a cassette centering device formed
by two parallel bars movable towards and away from
each other. FIG. 2 is a sectional view along line I-I of the centering
device according
REFERENCES:
patent: 3150263 (1964-09-01), Catlin
patent: 3457406 (1969-07-01), Reiniger
patent: 3826922 (1974-07-01), Ingles
patent: 3829698 (1974-08-01), Goetz
patent: 4416020 (1981-11-01), Wagner et al.
patent: 4426724 (1984-01-01), Cutter
patent: 4432095 (1984-02-01), Adelmeyer et al.
patent: 4489428 (1984-12-01), Schwieker
patent: 4538293 (1985-08-01), Cutter
patent: 4590738 (1986-05-01), Hosel et al.
patent: 4675894 (1987-06-01), Ohlson
patent: 4845734 (1989-07-01), Maki et al.
patent: 4894854 (1990-01-01), Guba et al.
patent: 4930147 (1990-05-01), Dieterlen et al.
patent: 4939764 (1990-07-01), Markos
patent: 5050203 (1991-09-01), Mirlieb et al.
Dieterle Hermann
Uffinger Friedrich
Eastman Kodak Company
Pincelli Frank
Porta David P.
Wong Don
LandOfFree
Device for centering X-ray film cassettes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for centering X-ray film cassettes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for centering X-ray film cassettes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1358134