Adjustable shutter for motion picture cameras

Claim 2

In a photographic apparatus, a combination comprising rotary shutter means incLuding two coaxial shutter blades normally defining an aperture of predetermined size, one of said blades being rotatable with reference to the other blade from an end position in which the blades define said aperture of predetermined size, and two coaxial hubs one of which is rigid with said one blade and the other of which is rigid with said other blade and is rotatable in said one hub, said other hub having an axially parallel slot; drive means for rotating said other hub; adjusting means rotatable with said shutter means and actuatable to rotate said one blade from said end position, said adjusting means including a plunger movable axially of said other hub and a cam and follower assembly connecting said plunger for rotation to said other hub and arranged to turn said one hub and said one blade from said end position in response to axial movement of said plunger, said cam and follower assembly comprising a follower rigid with said plunger and extending radially through and beyond said slot and a helical cam groove provided in said one hub and receiving a portion of said follower; and actuating means for said adjusting means, said actuating means being disengaged from said adjusting means in said end position of said one blade and including means for moving said plunger from a position corresponding to said end position of said one blade.

Claim 3

A combination as defined in claim 1, wherein said adjusting means further comprises means for permanently biasing said plunger to a predetermined position corresponding to said end position of said one blade.

Claim 4

A combination as defined in claim 2, wherein said drive means is arranged to rotate said other hub in a predetermined direction, said one blade being rotatable by inertia from said end position against the opposition of said biasing means on stoppage of said other blade.

Claim 5

A combination as defined in claim 1, wherein said blades comprise portions which are anchored in the respective hubs.

Claim 6

A combination as defined in claim 4, wherein said drive means comprises a portion which is integral with said other hub.

Claim 7

A combination as defined in claim 1, wherein said blades and the respective hubs consist of synthetic plastic material.

Claim 8

A combination as defined in claim 1, wherein said blades are integral with the respective hubs.

Claim 9

In a photographic apparatus, a combination comprising rotary shutter means including two coaxial shutter blades normally defining as aperture of predetermined size, one of said blades being rotatable with reference to the other blade from an end position in which the blades define said aperture of predetermined size, and two coaxial hubs one of which is rigid with said one blade and the other of which is rigid with said other blade and is rotatable in said one hub; drive means for rotating said other hub; adjusting means rotatable with said shutter means and actuatable to rotate said one blade from said end position, said adjusting means including a plunger movable axially of said other hub and a cam and follower assembly connecting said plunger to said other hub and arranged to turn said one hub and said one blade from said end position in response to axial movement of said plunger; actuating means for said adjusting means, said actuating means being disengaged from said adjusting means in said end position of said one blade and including means for moving said plunger from a position corresponding to said end position of said one blade, said actuating means further including a lever pivotable with reference to the body of said apparatus about a fixed axis and spring means for biasing said lever away from said plunger; and stop means for arresting said lever in a preselected position against the opposition of said spring means.

Claim 10

In a photographic apparatus, a combination comprising rotary shutter means including two coaxial shutter blades normally defining as aperture of predetermined size, one of said blades being rotatable with reference to the other blade from an end position in which the blades define said aperture of predetermined size, and two coaxial hubs one of which is rigid with said one blade and the other of which is rigid with said other blade and is rotatable in said one hub; drive means for rotating said other hub; adjusting means rotatable with said shutter means and actuatable to rotate said one blade from said end position, said adjusting means including a plunger movable axially of said other hub and a cam and follower assembly connecting said plunger to said other hub and arranged to turn said one hub and said one blade from said end position in response to axial movement of said plunger; actuating means for said adjusting means, said actuating means being disengaged from said adjusting means in said end position of said one blade and including means for moving said plunger from a position corresponding to said end position of said one blade, said actuating means further including a lever pivotable with reference to the body of said apparatus about a fixed axis and spring means for biasing said lever away from said plunger; and stop means for arresting said lever in a preselected position against the opposition of said spring means.

Claim 11

A combination as defined in claim 8, wherein said lever is pivotable by hand from said preselected position to thereby move said plunger axially of said other hub, and further comprising second stop means for arresting saId lever in a second preselected position corresponding to a second end position of said one blade with reference to said other blade.

Claim 12

A combination as defined in claim 9, wherein said blades define an aperture of minimum size in the second end position of said one blade.

Claim 13

A combination as defined in claim 10, wherein the size of said aperture in the second end position of said one blade is zero.

Claim 14

A combination as defined in claim 8, wherein said actuating means further comprises a motion transmitting member and means for adjustably securing said motion transmitting member being arranged to engage and to move said plunger axially through the intermediary of an antifriction bearing in response to movement of said lever away from said preselected position.

Claim 15

In a photographic apparatus, a combination comprising rotary shutter means including two coaxial shutter blades normally defining an aperture of predetermined size, one of said blades being rotatable with reference to the other blade from an end position in which the blades define said aperture of predetermined size, ad two coaxial hubs one of which is rigid with said one blade and the other of which is rigid with said other blade and is rotatable in said one hub; bearing means rotatably receiving said one hub and having abutment means for said one hub; means for biasing said one hub axially against said abutment means; drive means for rotating said other hub; adjusting means rotatable with said shutter means and actuatable to rotate said one blade from said end position, including a plunger movable axially of said one hub and a cam and follower assembly connecting said plunger for rotation to said other hub and arranged to turn said one hub and said one blade from said end position in response to axial movement of said plunger; and actuating means for said adjusting means, said actuating means being disengaged from said adjusting means in said end position of said one blade and including means for moving said plunger from a position corresponding to said end position of said one blade.

Claim 16

In a photographic apparatus, a combination comprising rotary shutter means including two coaxial shutter blades normally defining an aperture of predetermined size, one of said blades being rotatable with reference to the other blade from an end position in which the blades define said aperture of predetermined size, ad two coaxial hubs one of which is rigid with said one blade and the other of which is rigid with said other blade and is rotatable in said one hub; bearing means rotatably receiving said one hub and having abutment means for said one hub; means for biasing said one hub axially against said abutment means; drive means for rotating said other hub; adjusting means rotatable with said shutter means and actuatable to rotate said one blade from said end position, including a plunger movable axially of said one hub and a cam and follower assembly connecting said plunger for rotation to said other hub and arranged to turn said one hub and said one blade from said end position in response to axial movement of said plunger; and actuating means for said adjusting means, said actuating means being disengaged from said adjusting means in said end position of said one blade and including means for moving said plunger from a position corresponding to said end position of said one blade.

Claim 17

A combination as defined in claim 13, further comprising support means for said bearing means, said bearing means being adjustable with reference to said support means in the axial direction of said hubs.

Claim 18

A combination as defined in claim 14, wherein said support means comprises a tube having internal threads meshing with external threads provided on said bearing means.