Projector for photographic transparencies

Claim 2

In a slide projector, a combination comprising means for supporting slides in a transfer position; shutter means movable between operative and inoperative positions in which said shutter means respectively overlaps and is out of registry with a slide in a projection position remote from said transfer position; a single motion transmitting device; and a manually operable slide changer provided with slide shifting means and movable through cycles each of which includes a movement relative to said motion transmitting device from a first position to a second position to thereby advance a slide from said transfer position to said projection position by way of said shifting means, a movement from said second position to a third position to thereby move said shutter means from said operative position to said inoperative position by way of said motion transmitting device while a slide dwells in said projection position, a movement from said third position to said second position to thereby move said shutter means from said inoperative position to said operative position by way of said motion transmitting device while a slide continues to dwell in said projection position, and a movement relative to said motion transmitting device from said second position to said first position to thereby return a slide from said projection position to said transfer position by way of said shifting means while said shutter means continues to assume said operative position, said shifting means comprising a slideengaging member which moves slides from said transfer position to said projection position in response to movement of said slide changer from said first position to said second position and a spring yieldably connecting said slide-engaging member with said slide changer to permit a movement of said slide changer relative to said slide-engaging member from said second position to said third position and from said third position back to said second position, said spring being arranged to store energy in response to movement of said slide changer from said second position to said third position.

Claim 3

In a slide projector, a combination comprising means for supporting slides in a transfer position; shutter means movable between operative and inoperative positions in which said shutter means respectively overlaps and is out of register with a slide in a projection position remote from said transfer position; a single motion transmitting device; a manually operable slide changer provided with slide shifting means and movable through cycles each of which includes a movement relative to said motion transmitting device from a first position to a second position to thereby advance a slide from said transfer position to said projection position by way of said shifting means, a movement from said second position to a third position to thereby move said shutter means from said operative position to said inoperative position by way of said motion transmitting device while a slide dwells in said projection position, a movement from said third position to said second position to thereby move said shutter means from said inoperative position to said operative position by way of said motion transmitting device while a slide continues to dwell in said projection position, and a movement relative to said motion transmitting device from said second position to said first position to thereby return a slide from said projection position to said transfer position by way of said shifting means while said shutter means continues to assume said operative position, said motion transmitting device being respectively arranged to pivot from a first position to a second position and vice versa in responsE to movement of said slide changer from said second position to said third position and vice versa, said motion transmitting device comprising a pair of followers one of which is engaged by said slide changer during movement from said second to said third position of said slide changer and the other of which is engaged by said slide changer during movement of said slide changer from said third position to said second position; and means for permanently biasing said motion transmitting device to one of said first and second position thereof.

Claim 4

In a slide projector, a combination comprising means for supporting slides in a transfer position; shutter means movable between operative and inoperative positions in which said shutter means respectively overlaps and is out of register with a slide in a projection position remote from said transfer position; a single motion transmitting device; a manually operable slide changer provided with slide shifting means and movable through cycles each of which includes a movement relative to said motion transmitting device from a first position to a second position to thereby advance a slide from said transfer position to said projection position by way of said shifting means, a movement from said second position to a third position to thereby move said shutter means from said operative position to said inoperative position by way of said motion transmitting device while a slide dwells in said projection position, a movement from said third position to said second position to thereby move said shutter means from said inoperative position to said operative position by way of said motion transmitting device while a slide continues to dwell in said projection position, and a movement relative to said motion transmitting device from said second position to said first position to thereby return a slide from said projection position to said transfer position by way of said shifting means while said shutter means continues to assume said operative position, said motion transmitting device being respectively arranged to pivot from a first position to a second position and vice versa in responsE to movement of said slide changer from said second position to said third position and vice versa, said motion transmitting device comprising a pair of followers one of which is engaged by said slide changer during movement from said second to said third position of said slide changer and the other of which is engaged by said slide changer during movement of said slide changer from said third position to said second position; and means for permanently biasing said motion transmitting device to one of said first and second position thereof.

Claim 5

A combination as defined in claim 2, wherein said shutter means is pivotable between said operative and inoperative positions thereof and said motion transmitting device further comprises a first portion which pivots said shutter means to said inoperative position in response to engagement between said slide changer and said one follower and a second portion which pivots said shutter means to said operative position in response to engagement between said slide changer and said other follower.

Claim 6

In a slide projector, a combination comprising means for supporting slides in a transfer position; shutter means movable between operative and inoperative positions in which said shutter means respectively overlaps and is out of register with a slide in a projection position remote from said transfer position; a motion transmitting device; and a slide changer provided with slide shifting means and movable through cycles each of which includes a movement relative to said motion transmitting device from a first position to a second position to thereby advance a slide from said transfer position to said projection position by way of said shifting means, a movement from said second position to a third position to thereby move said shutter means from said operative position to said inoperative position by way of said motion transmitting device while a slide dwells in said projection position, a movement from said third position to said second position to thereby move said shutter means from said inoperative position to said operative position by way of said motion transmitting device while a slide continues to dwell in said projection position, and a movement relative to said motion transmitting device from said second position to said first position to thereby return a slide from said projection position to said transfer position by way of said shifting means while said shutter means continues to assume said operative position, said shifting means comprising a slide-engaging member which moves slides from said transfer position to said projection position in response to movement of said slide changer from said first position to said second position and resilient means yieldably connecting said slide-engaging member with said slide changer to permit a movement of said slide changer relative to said slide-engaging member from said second position to said third position and from said third position back to said second position, said resilient means being arranged to store energy in response to movement of said slide changer from said second position to said third position.

Claim 7

In a slide projector, a combination comprising means for supporting slides in a transfer position; shutter means movable between operative and inoperative positions in which said shutter means respectively overlaps and is out of register with a slide in a projection position remote from said transfer position; a motion transmitting device; and a slide changer provided with slide shifting means and movable through cycles each of which includes a movement relative to said motion transmitting device from a first position to a second position to thereby advance a slide from said transfer position to said projection position by way of said shifting means, a movement from said second position to a third position to thereby move said shutter means from said operative position to said inoperative position by way of said motion transmitting device while a slide dwells in said projection position, a movement from said third position to said second position to thereby move said shutter means from said inoperative position to said operative position by way of said motion transmitting device while a slide continues to dwell in said projection position, and a movement relative to said motion transmitting device from said second position to said first position to thereby return a slide from said projection position to said transfer position by way of said shifting means while said shutter means continues to assume said operative position, said shifting means comprising a slide-engaging member which moves slides from said transfer position to said projection position in response to movement of said slide changer from said first position to said second position and resilient means yieldably connecting said slide-engaging member with said slide changer to permit a movement of said slide changer relative to said slide-engaging member from said second position to said third position and from said third position back to said second position, said resilient means being arranged to store energy in response to movement of said slide changer from said second position to said third position.

Claim 8

A combination as defined in claim 4, wherein said motion transmitting device is respectively arranged to move from a first to a second position and vice versa in response to movement of said slide changer from said second to said third position and vice versa, and further comprising means for permanently biasing said motion transmitting device to one of said first and second positions thereof.

Claim 9

A combination as defined in claim 5, wherein said biasing means comprises a single spring.

Claim 10

A combination as defined in claim 5, wherein said motion transmitting device is rotatable between said first and second positions and further comprising means for articulately connecting said motion transmitting device to said shutter means.

Claim 11

A combination as defined in claim 7, wherein said motion transmitting device is a rotary electromagnet and said means foR articulately connecting said motion transmitting device with said shutter means comprises a pin-and-slot connection.

Claim 12

A combination as defined in claim 5, wherein said motion transmitting device is an electromagnet which is rotatable between said first and second positions thereof, said slide changer further comprising means for energizing said electromagnet to thereby effect a movement of said electromagnet between said positions thereof in response to movement of said slide changer to one of said third and second positions thereof.