Sheet feeding or delivering – Feeding – Separators
Patent
1989-11-08
1991-10-15
Valenza, Joseph E.
Sheet feeding or delivering
Feeding
Separators
271105, 271163, 271164, 271171, 414404, 414411, 533811, 533821, 53266R, 378172, 378182, 378188, B65H 314
Patent
active
050567705
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device for releasing a film sheet which adheres to the inner surface of the upper cassette portion of an X-ray film cassette when said upper cassette portion is pivoted to its open position, with the aid of air blown between the film sheet and the inner surface of the upper cassette portion.
BACKGROUND ART
A film-sheet releasing device of this type is known (DE-OS 30 00 760). The known device is associated with a slider provided in a cassette unloading and reloading apparatus for aligning and positioning an X-ray film cassette in the cassette unloading and reloading station of the apparatus. The slider is located laterally above a transport belt by means of which an X-ray film cassette is transported from an input point up to a final abutment in the unloading and reloading station. If an X-ray film cassette is present in the unloading and reloading station, it is brought into contact with a stationary abutment ledge opposite to the slider when said slider moves laterally towards the X-ray film cassette. The film-sheet releasing device consists of a number of probes in the form of blast tubes (air nozzles) which are arranged in the slider and extended pneumatically in the direction of the X-ray film cassette after the upper cassette portion has been slightly pivoted to its open position starting from the cassette side facing the slider. The blast tubes are moved below the marginal area of the slightly open upper cassette portion such that the blast air emitted by them can be distributed between the lower side of the upper cassette portion and a film sheet partially adhering to said lower side so that when the upper cassette portion is fully opened, the film sheet is not moved with it but remains in the lower cassette portion.
The probes are distributed at regular intervals across the length of the slider their number is determined by the length of an X-ray film cassette of maximum size.
Owing to the great number of probes each of which is associated with a pneumatically controlled device consisting of a pressure cylinder and a piston guided therein and provided with the probe, the film-sheet releasing device as a whole is very expensive and complicated.
DISCLOSURE OF THE INVENTION
It is the object of the invention to provide an inexpensive film-sheet releasing device of simple construction which operates reliably and precisely and which requires only one single air nozzle for releasing a film sheet from the upper cassette portion of X-ray film cassettes of various sizes.
In accordance with the invention this object is attained in that a linkage-type multiple-lever arrangement is hinged to a bar adapted for aligning and positioning X-ray film cassettes of different sizes, the last member of said multiple-lever arrangement extending into the path of movement of the upper cassette portion of the X-ray film cassettes when said upper portion is pivoted to its open position, and being engaged and held by said upper cassette portion, in that the multiple-lever arrangement can be pivoted along when the upper cassette portion is pivoted to its open position and in that the last member supports an air nozzle whose air jet is directed approximately tangentially past the front edge of a film sheet, seen in the input direction of the cassette, for releasing such film sheet if adhering to the inner surface of the film-sheet support of the other cassette portion.
According to a useful modification a linkage-type multiple-lever arrangement is hinged to at least one of two parallely guided bars movable towards and away from each other respectively for positioning the X-ray film cassette.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in further detail with reference to an embodiment illustrated in the drawings in which:
FIG. 1 shows a plan view of a cassette-positioning device consisting of two parallely guided bars which are movable towards and away from each other respectively;
FIG. 2 shows a plan view of part of the positioning device according t
REFERENCES:
patent: 4692083 (1987-09-01), LeRoux et al.
patent: 4811547 (1989-03-01), Raats et al.
patent: 4823535 (1989-04-01), Schmidt et al.
Killguss Heinz
Mirlieb Bernd
Quanz Gerhard
Childress G. Herman
Druzbick Carol Lynn
Eastman Kodak Company
Valenza Joseph E.
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