Optics: image projectors – Slide transfer mechanism – Slides reciprocated horizontally
Patent
1991-03-20
1993-08-17
Cuchlinski, Jr., William A.
Optics: image projectors
Slide transfer mechanism
Slides reciprocated horizontally
353103, 353118, G03B 2306, G03B 2314
Patent
active
052373541
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The subject matter of the invention relates to a slide projector which is adapted for use with circular trays having different numbers of slide compartments and has a pulse-controlled electronic switch unit for controlling a transport motor which is adapted to selectively move the circular trays in the forward or backward direction and which has, moreover, a tray-fixing means.
A projector of the generic type which is a dissolve projector having two projection systems is known from U.S. Pat. No. 4,416,520. It is adapted to accommodate both a circular tray with a smaller number of slide compartments and a circular tray With a reater number of slide compartments. Both circular trays are provided with downwardly extending pins. The tray-fixing means of this known projector consists of a Maltese-cross transmission seated on a driving shaft, said transmission actuating a slide lifting and lowering lever and being connected via an actuating rod with a pivot lever having a locking nose which can be pivoted into a position between two transport pins for fixing the tray.
Owing to its multitude of movable and complex components, this tray-fixing means is complicated and expensive.
It is the object of the invention to provide a slide projector of the type described above wherein the fixing means consists of one single movable and uncomplicated component which is easy to produce and which is not operatively connected with other assembly groups. Moreover, the means is to allow trays without pins to be fixed.
In accordance with the invention this object is attained in that a slider is provided which can be actuated by the electronic switch unit following each indexing of the tray, said slider being brought into engagement with separate transport and fixing means associated with the compartments of each circular tray, following each indexing movement of the tray.
According to a useful modification of the invention the slider comprises counter-fixing means associated with the transport and fixing means and adapted to the shape and size thereof.
According to a further useful modification of the invention the counter-fixing means consist of a first projection arranged in the area of the free end of the slider and of a second projection located at a distance of said first projection, the engagement surfaces of said projections facing each other and being aligned in the direction of movement of the slider.
Further features and advantages can be inferred from the subclaims as we11 as from the description of a number of embodiments of the invention illustrated in the drawings wherein:
FIG. 1 shows a partial view from below of a circular slide tray with transport and fixing means,
FIG. 2 shows a plan view of a slide projector for a circular slide tray according to FIG. 1 with a tray-fixing means and a tray-transport device,
FIG. 3 shows a sectional view along line II--II in FIG. 2 of the tray-fixing means according to FIG. 2,
FIG. 4 shows a lateral view of the tray-fixing means according to FIG. 2,
FIG. 5 shows an elevational view of a control member of the tray-transport device according to FIG. 2,
FIG. 6 shows a plan view of the tray-transport device according to FIGS. 2 and 4, and
FIGS. 7 and 8 each show a partial sectional view of a tray with, and without a recess for the actuation of the switch.
FIG. 1 shows a circular tray with 141 slide compartments for 140 slides. It has substantially the same shape and size as a circular tray with 81 slide compartments for 80 slides while featuring an additional toothing 17 on the circumference of the ring 14 provided with 81 transport pins, each of the 141 slide compartments being associated with a tooth gap 18 of the toothing 17. In the following description, the circular tray for 80 slides bears the reference numeral 10 and the circular tray for 140 slides the reference numeral 12.
ln the embodiment illustrated the two circular trays 10 and 12 are transported by means of an indexing wheel 24 of a motor-driven gear drive 22, said indexing wheel engaging between the transpo
REFERENCES:
patent: 3586433 (1971-06-01), Mulch
patent: 3644031 (1972-02-01), Bennett
patent: 3697161 (1972-10-01), Blecher
patent: 4253789 (1981-03-01), Hultgren
patent: 4402584 (1983-09-01), Palmer
patent: 4406531 (1983-09-01), Karl et al.
Cuchlinski Jr. William A.
Dowling William C.
Eastman Kodak Company
Twait Marianne J.
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