| 摘要 |
The present invention provides a play-back and/or recording apparatus which has an improved positioning device for determining a working position of play-back heads and pressing devices (pressure rollers). The positioning device comprises a rigid support which rigidly carries at least one play-back head and one pressing device. The rigid support, along with elements rigidly attached to it, is moved into a working position in the apparatus by forming three points of contact with block elements fixed with respect to the frame of the apparatus. These three points of contact form an imaginary triangular configuration and insure the accurate positioning of the play-back head and pressing device while resulting in a simplified positioning device.
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