JPH0450826U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention, Figure 2 is a plan view showing one embodiment of the present invention;
The figure is a partial view of the connecting roller immediately after it starts contacting the cam arm, Figure 3 is a partial view of the moment the connecting roller crosses the locking arm of the return prevention lever, and Figure 4 is a partial view of the connecting roller near the bottom dead center. Partial view at the time of . 1... Leading blade drive lever, 5... Trailing blade driving lever, 8... Set bar, 8f... First cam edge, 8g... Second cam edge, 12... Cam gear, 1
2b...Connection roller, 16...Reverse prevention lever,
16a... Source arm, 16b... Locking arm,
16c... Music section.

Claims (1)

[Claims for Utility Model Registration] A blade drive member connected to a shutter blade and biased in a direction to expose the shutter blade; and a blade drive member movable in a direction to move the blade drive member to a set position; A setting member that is biased in the opposite direction to the direction in which the drive member is moved to the set position, and a cam connection roller that rotates as the rotation of the motor that rotates substantially in one direction is transmitted and passes through a circumferential trajectory. a first cam member that receives a force from the cam connection roller that causes the set member to travel in a direction to move the blade drive member to the set position; and the first cam portion. and a second cam portion having a radius of curvature substantially equal to the radius of curvature of the turning locus of the cam connecting roller is formed in association with the setting member, and the cam connecting roller is connected to the second cam portion. When the set member is in contact with the second cam portion, the set member is configured to position the blade drive member at the set position, and the rotating member is stopped while the cam connecting roller is in contact with the second cam portion. Accordingly, the set member is stopped at the set position value of the blade drive member, and the set member is released by retracting the cam connecting roller from the second cam portion. In the shutter drive mechanism, a reversal prevention lever having a locking arm that enters a travel path of the cam connection roller is swingably supported on a member in which the first and second cam portions are formed, and the reversal prevention lever is swingably supported. When the locking arm locks the prevention lever into the second
The locking arm biases the cam portion toward the first cam portion with a force smaller than the rotational force of the cam connection roller, and the locking arm limits the swinging limit of the reverse prevention lever due to this biasing force. A drive mechanism for a camera shutter, characterized in that it is regulated at a position where the connecting roller enters a travel path, and the swinging limit of the reversal prevention lever accompanying the travel of the cam connecting roller is not substantially restricted. .