X-ray or gamma ray systems or devices – Photographic detector support – Serial plate or cassette changer
Patent
1989-11-08
1991-04-09
Westin, Edward P.
X-ray or gamma ray systems or devices
Photographic detector support
Serial plate or cassette changer
378169, 378170, 378181, 378182, 378187, 378167, A61B 614, G03B 4204, G03B 4202
Patent
active
050070754
DESCRIPTION:
BRIEF SUMMARY
The innovation relates to a device for holding down the lower cassette portion of an X-ray film cassette which is located in a cassette unloading and reloading apparatus and can be positioned by means of two parallely guided bars movable towards and away from each other respectively.
A device is known (DE-OS 306 720) in which an X-ray film cassette is accurately positioned between two parallely guided bars pulled towards each other by a tension spring and transported by means of motor-driven rollers on a receiving plate towards a final abutment in a cassette unloading and reloading station. At the free ends of the bars, which are situated in the area of the final abutment, vertically shiftable claws are mounted which are pressed downwardly by a spring and which each rest on a stationary abutment and are thus held upwardly in opposition to the spring force so that the bent portions of the claws are located above the front edge of the frame of the X-ray film cassette resting against the final abutment. When the upper cassette portion is to be opened, the receiving plate together with the X-ray film cassette and the bars is lifted to an inclined position, the claws also being lifted from the stationary abutments and pressed downwardly by means of their springs As a result the two claws are moved onto the frame of the X-ray film cassette and hold the cassette down on the receiving plate situated in its inclined position.
This known arrangement is disadvantageous in that additional control means are required for keeping the known hold-down devices out of engagement with an X-ray film cassette positioned on the final abutment in an unloading and reloading station.
It is the object of the innovation to further develop and improve the known cassette hold-down device such that no additional means are required for its control.
In accordance with the innovation this object is attained in that a hold-down lever, which can be pivoted into and out of the transport path of the X-ray film cassette, is mounted to each bar and in that each hold-down lever comprises a control arm resting against a side wall of the upper cassette portion.
In detail the innovation provides that the control arms of the two hold-down levers extend upwardly in an inclined position and form control surfaces facing the side walls of the upper cassette portion such that the hold-down levers are held in engagement with the lower cassette portion when the upper cassette portion has been pivoted to its open position and are disengaged from the lower cassette portion when the upper cassette portion has been pivoted to its closed position.
Other features and advantages can be inferred from the further subclaims as well as from the description of an embodiment illustrated in the drawings in which:
FIG. 1 is a plan view of the subject matter of the innovation in a cassette positioning device,
FIG. 2 is a plan view of the subject matter according to FIG. 1 in an enlarged representation, and
FIG. 3 is a sectional view along line II--II of the subject matter according to FIG. 2.
In an apparatus 1 for removing exposed film sheets from X-ray film cassettes of different sizes and for reloading the cassettes with unexposed film sheets, a device for positioning the X-ray film cassettes is arranged in the area of the unloading and reloading station. This positioning device comprises two parallely guided bars 10 and 12 which are movable towards and away from each other respectively by means of a symmetrical lever arrangement 6, 7, 8 in combination with a driven rod 4, 5. A transport belt 15 transports an X-ray film cassette 19 from an input point to the loading and reloading station. Transport belt 15 is placed around two spindles 14, one of which is driven. In the present embodiment an X-ray film cassette 19 of small size is illustrated.
The bars 10 and 12 are mounted by means of screws 17 to angle plates 11 and 13. Each angle plate 11 and 13 respectively is shiftably mounted by means of a bushing 11a and 13a respectively on a guide shaft 16 held between two mounti
REFERENCES:
patent: 4541173 (1985-09-01), Sakuma et al.
patent: 4815066 (1989-03-01), Horvath
patent: 4866551 (1989-09-01), Kishimoto et al.
Killguss Heinrich
Mirlieb Bernd
Childress G. Herman
Eastman Kodak Company
Westin Edward P.
Wong Don
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