Abstract: A document hold-down cover for a copy machine comprises a lifting means, a hinge means, a deck plate of said copy machine, a hold-down-cover, the lifting means is arranged between said deck plate and said hold-down cover, said hinge means is attached between said lifting means and said hold-down cover. According to the invention, when copying thick material which is put on the contacting glass for copying the closed-hold-down cover comes into parallel with the material on the glass since the lifting means is lifted by leverage. When the material is taken off the glass cover, the lifting means comes down or returns back to the first position by gravity. The hold-down cover can be opened and closed in both the first position and the lifting position.

Abstract: An automatic tone arm returning device in a record player which comprises: pulse generator means for producing pulses whose cycle is proportional to the speed of the tone arm movement during record playing means for detecting the completion of record playing by measuring either the pulse width, the number of pulses produced in a unit of time, or the time interval between the pulses; and a Schmitt trigger circuit inserted between said two means and activated while the pulse is within a predetermined range of level; whereby the tone arm can be prevented from being return erroneously by the eccentric recorded grooves on record when the record is still being played.

Abstract: A door operating mechanism holds a door in a closed position and automatically opens the door of a console which contains an electric audio apparatus such as a stereo. When the door is first pushed to a close, the door operating mechanism which is inside a plate of the console and which has a front end portion which extends out from the plate holds the door magnetically and when the door is pushed again an operative member slidably mounted in a cylindrical casing of the door operating mechanism pushes the door with a pop to open it automatically. The door is thus held in a closed position but pops open when the door is pushed again.