Abstract A photographic slide projector is provided with electrically driven means for changing slides. Each slide is provided with a projection or protuberance on one edge of the slide, in a variable position depending on the length of time it is desired to have this particular slide held in viewing position. The projector mechanism includes a feeler which is displaced by the projection on the slide when the slide is shifted from the slide magazine into slide viewing position within the projector, the extent of displacement of the feeler depending upon the position of the projection on the slide. The extent of displacement of the feeler, in turn, determines the setting of a variable resistor which controls the operation of a timer which controls the length of time that the slide is held in viewing position, before the slide change drive operates to move the slide back into the magazine and to shift the next slide from the magazine into viewing position.
The combination with a picture slide projector having means for automatically changing slides, of a picture slide assembly having means cooperating with said projector to determine the time interval that the slide assembly remains in projection position in the projector; said projector including a slide changing drive, a timer for controlling the length of the time interval during which said drive leaves each slide in projection position before changing to the next slide, and a movable feeler member effective upon movement to adjust said timer to a different time interval; said picture slide assembly including a conventional slide mount in which a picture slide is held, and a switching element separate from and lying against one face of said slide mount, said switching element having on one edge a protuberance projecting outwArdly beyond the corresponding edge of said mount, said element otherwise having substantially the same outline as said mount, said protuberance being in position to engage and move said feeler element of said projector while said picture slide assembly is being moved into projection position in said projector by operation of said means for changing slides.
Claim 2
Dependent Claim
187 words
The combination with a picture slide projector having means for automatically changing slides, of a picture slide assembly having means cooperating with said projector to determine the time interval that the slide assembly remains in projection position in the projector; said projector including a slide changing drive, a timer for controlling the length of the time interval during which said drive leaves each slide in projection position before changing to the next slide, and a movable feeler member effective upon movement to adjust said timer to a different time interval; said picture slide assembly including a conventional slide mount in which a picture slide is held, and a switching element separate from and lying against one face of said slide mount, said switching element having on one edge a protuberance projecting outwArdly beyond the corresponding edge of said mount, said element otherwise having substantially the same outline as said mount, said protuberance being in position to engage and move said feeler element of said projector while said picture slide assembly is being moved into projection position in said projector by operation of said means for changing slides.
Claim 3
Dependent Claim
17 words
The invention defined in claim 1 wherein said switching element is detachably secured to said slide mount.
Claim 4
Dependent Claim
17 words
The invention defined in claim 1, wherein said switching element is adhesively secured to said slide mount.
Claim 5
Dependent Claim
34 words
The invention defined in claim 3, wherein the adhesive securing said switching element to said slide mount is of a character enabling said element to be peeled off of the slide mount when desired.