| 摘要 |
PURPOSE:To obtain a device which enables light release operation, has low power consumption, and is applicable to a simultaneous sound recording cinecamera, etc., by providing a ratchet disk rotating, pitch by pitch, by powering up an electromagnetic device, and a cam disk and displacement members. CONSTITUTION:A ratchet disk 11 capable of rotating, pitch by pitch, in one direction by powering up an electromagnetic device 14 in a short time, a cam disk 10 coupling with it, and displacement members 12, 7, 5, etc., displaced in contact with the cam part of the cam disk 10 are provided to bring a pinch roller 3 and a capstan shaft 1 into press contact with each other or to separate them from each other according to the displacement of those displacement members. For example, when the electromagnetic device 14 is powered up, a movable iron piece 15 is attracted downward and a ratchet pawk 13 drives the ratchet disk 11 to rotate the control cam disk 10 by an angle equivalent to one tooth of the ratchet disk 11. This turning permits the contact part of a pin 12 to move from a cam A to a B, and the pinch roller 3 is brought into press contact with the capstan 1 through the rotation of a control plate 7 and an arm 5. |
