| 摘要 |
A disc cartridge having a magnetic sheet jacket, a magnetic disc rotatably accommodated therein, and a window permitting the insertion of a magnetic head, is provided with a counter display member which is rotatably mounted in said jacket and surrounded, on the upper side of the jacket, by a graduated display scale and which has a keyhole-like aperture forming a radially oriented pointer and adapted to receive a drive pin. The counter display member is associated with an elastically acting click and pawl arrangement and has a first series of teeth formed on a flange-like portion of said counter display member and a click fixed to said jacket and elastically engaging the teeth of said first series of teeth and is also associated with a blocking device which keeps the counter display member in a firmly locked position as soon as it is mechanically disconnected from the drive pin. |
