| 摘要 |
<p>PURPOSE:To prevent dust and refuse, etc., from entering into the inside of the device by providing a protection plate for the inside of the device to slide itself and close a cassette ascending and descending hole when a cassette holder is brought under an up state. CONSTITUTION:When the cassette ascending and descending hole 24 is opened at the time of loading and unloading a cassette 3 into and from the device, the cassette holder 8 is ascended by an up spring 15 in its tension force. Then, when it comes up just prior to the uppermost part, a slide gear 17 is slid upward by a claw part 20 of the cassette holder 8, and its torque is transmitted to a primary gear 21. Consequently, a secondary gear 22 meshed with the primary gear is rotated to drive a gear part 23 of the protection plate 5 for the inside of the device, thus sliding the protection plate 5 for the inside of the device and then closing the cassette ascending and descending hole 24. By this method, the cassette ascending and descending hole 24 is never left as it is opened, and hence the entering of refuse, rubbish or dust into the inside of the device cannot take place.</p> |
