| 摘要 |
PURPOSE:To simplify a structure for detaining end parts of a spring and to contrive high accuracy and low cost by using a V-shaped torsion coil spring, detaining one end of it by bending to a recessed part of a cassette case and providing then a guide part to be linked with the recessed part. CONSTITUTION:The cassette case is equipped with a shutter 17 which is freely slidably fitted nor opening and closing a head inserting hole 15 and an approximately V-shaped torsion coil spring 20 with its end parts bent in a different direction from each other for energizing the shutter to be in the position of closing the head inserting hole 15. Moreover, the shutter 17 is provided with a hook part 28 for detaining one end part of the torsion coil spring 20 and the recessed part 27 for receiving the other end part of the torsion coil spring 20 at an end of the side surface. Then, the guide part 26 provided between the recessed part 27 and the shutter acts to guide one end part of the torsion spring 20 while the other end part is inserted into the recessed part 27. By this method, the form of spring parts is simplified and the fitting of the spring is secured and simplified.
|
