Film advancing mechanism for film roll cameras having delayed clutch action

Claim 2

In a roll film camera having a film winding and shutter cocking device by which the shutter is tensioned during film winding operation, the combination comprising: a camera housing having a cover movable between a closed position and an open position for inserting the roll film into the camera, a driving lever manually operable from outside of the camera, film transport driving means having a one-way clutch coupled to said driving lever and a driving shaft connected to said oneway clutch by gearing, a transmission device interposed between said driving shaft and the shutter cocking device to operatively connect the former to the latter, rotatable clutch means in said transmission device operable to delay the shutter cocking operation until the winding of a leader strip of the film has been completed, and means for actuating said clutch means in cooperation with the movement of said cover whereby only when said cover is moved in its closed position, said rotatable clutch is operated by the winding movement of said driving lever.

Claim 3

The combination according to claim 1, wherein said rotatable clutch means includes: a driving member axially slidable on said driving shaft and rotatable therewith, a driven member connected to the shutter cocking device by gearing and disengaged from said driving member by a spring when said cover is opened, and a screw thread formed on outer periphery of said driving member and engageable with said clutch actuating means to cause axially movement of said driving member toward said driven member by rotation thereof when said cover is closed.

Claim 4

The combination according to claim 1 wherein said rotatable clutch means includes: a driving member axially slidable on said driving shaft and rotatable therewith, a driven member connected to the shutter cocking device by gearing, said driving member being urged toward said driven member by a spring, a screw thread formed on outer periphery of said driving member, and a resilient follower member on the camera body engageable with said screw thread for controlling the axial movement of said driving member, said clutch actuating means includes a pivotable lever coupled to said driving member and moved in cooperation with said cover; when said pivotable lever is disengaged from said driving member by the movement of said cover to the closed position thereof, said screw thread is engaged by said resilient follower member to move the driving member axially to engage said driving member and said driven member upon winding movement of said driving lever.

Claim 5

The combination according to claim 1, wherein said rotatable clutch means includes: a cylindrical member fixed on said driving shaft and having a dependent projection, a driving clutch member slidably and rotatably mounted on said driving shaft and having a dependent projection and an upstanding projection, said clutch actuating means including a pivotable lever for sliding the driving clutch member along said driving shaft, said transmission device including a driven gear having an upstanding projection adapted to be abutted by the dependent projection of the clutch member when the clutch means is engaged, an intermediate ring rotatably mounted on the driving clutch member and having upstanding and dependent projections formed on the periphery, the dependent projection on the intermediate ring and the upstanding projection of the clutch member being rotatable in the same plane to abut each other, a torsion spring interconnecting the cylindrical member and the clutch member, the spring biasing said clutch member in a linear direction to engage the dependent projection thereon with the upstanding projection on the driven gear and in a rotational directIon to engage one face of the upstanding projection on the clutch member with one face of the dependent projection of the cylindrical member, rotation of the driving shaft rotating the cylindrical member almost a complete turn to abut the opposite face on the dependent projection thereon with the opposite face of the upstanding projection on the intermediate ring, the continued rotation of the driving shaft rotating the cylindrical member and intermediate ring until the dependent projection on the intermediate ring abuts the upstanding projection on the clutch member to couple the driving shaft with the driven gear.