公开(公告)号：US4668067A

公开(公告)日：1987-05-26

申请号：US902730

申请日：1986-09-02

申请人： Horst Simon ,  Heinrich Killguss ,  Otto Wisst

发明人： Horst Simon ,  Heinrich Killguss ,  Otto Wisst

IPC分类号： G03B9/40 ,  G03B9/70 ,  G03B9/16

CPC分类号： G03B9/70 ,  G03B9/40

摘要： In a photographic shutter, an opening blade and a closing blade are settable in respective tensioned positions from which the blades can be released to first uncover and then recover an exposure opening. A cam device is mounted for unidirectional rotation to release the blades from their tensioned positions and to reset the blades to such positions. The cam device has an arcuate camming surface which extends spirally about the axis of the cam device from an area of minimum radius to an area of maximum radius as the cam device is rotated. A step-like surface of the cam device connects the areas of maximum and minimum radii to cause an abrupt drop from the maximum radius area to the minimum radius area. Respective springs urge the opening and closing blades against the camming surface. This causes each blade to be released from its tensioned position to drop from the maximum radius area to the minimum radius area when the maximum radius area moves out of the way of the blade, and causes each blade to be reset to its tensioned position when the maximum radius area moves back to the blade.

摘要翻译： 在摄影快门中，打开叶片和关闭叶片可设置在相应的张紧位置，从该位置可释放叶片以首先揭开，然后恢复曝光开口。 安装凸轮装置用于单向旋转以将叶片从其张紧位置释放并将叶片复位到这样的位置。 凸轮装置具有弓形凸轮表面，当凸轮装置旋转时，凸轮装置从最小半径的区域螺旋地延伸到最大半径的区域。 凸轮装置的阶梯状表面连接最大和最小半径的区域，使得从最大半径面积突然下降到最小半径面积。 各弹簧将打开和关闭的叶片推向凸轮表面。 这使得当最大半径面积移动离开叶片时，使每个叶片从其张紧位置释放，从最大半径面积下降到最小半径面积，并且当叶片的最大半径面积移动到叶片的方式时，使每个叶片被复位到其张紧位置 最大半径区域移回刀片。