Patent GB-477396-A (GB)
Title: Improvements in or relating to sound recording and sound reproducing apparatus having endless band sound record carriers
IPC: G11B15/34
Filed: 1936-05-22
Abstract: 477,396. Sound recording and reproducing apparatus. DANIEL, K. May 22, 1936, No. 14572. Convention date, Feb. 29. [Class 40 (ii)] Relates to sound recording and reproducing apparatus having an endless sound record carrier which is rolled up into a roll and rests upon a horizontal rotatable support and consists in providing, in the interior of the film roll, a guide member having a wall running outwardly in an inclined direction from below upwards, said guide member being adapted to rotate with the plate or turntable serving as the support for the film roll. As shown, the apparatus is enclosed in a casing 1, having a hinged front part 2 and a drawer 3 in which is arranged a vertical axle 4 around which a horizontal plate or turntable 5 is adapted to rotate. The sound record carrier rolled up into a roll 7 is arranged within the annular chamber of a box 6 placed on the turntable 5, the box being open at the top and the walls of the chamber being inclined from below upwards so that the inner wall 26a serves as a guide member for the sound record carrier as it is unwound from the roll. The record carrier is drawn out upwardly from the roll 7 in a loop 8 through an opening 9 in the casing and passes over a freely movable guide roller 12 through a brake member 13 and over a fixed guide member 10 and a toothed driving roller 11 against which it is pressed by a roller 17 and from whence it proceeds to be wound up on the outside of the roll. A sound-box 18 is mounted on a horizontal axle 19 above the member 10 in such a manner that it can be displaced in a horizontal direction transversely to the direction of movement of the record carrier. The sound-box is provided with a recording stylus 20 and a reproducing stylus 21 which are arranged in a common holder 22 and are inserted in the sound-box as a unit. The member 10 is eccentrically journalled in the casing 1 so that by turning this member through 180‹ either the recording stylus 20 or the reproducing stylus 21 can be put into operation. In the intermediate position of the member 10, both styluses are out of engagement with the record carrier. A member 23 for removing shavings is arranged between the sound-box and driving roller 11. After each revolution of the record carrier, a pin, which is resiliently pressed against the edge of the record carrier, drops into a recess in the edge thereof so as to close a contact to effect a transverse movement of the sound-box from one sound groove to the next. The Specification as open to inspection under Sect. 91 comprises also a construction of braking member 13 according to which this member is formed of two members hinged together and one of these members is provided with springs adapted to be pressed by means of an adjusting screw to a greater or lesser extent against the record carrier. The transverse movement of the sound-box is also described as being effected by the closure of electrical contacts which removes a stop device holding the sound-box in place and allows the latter to be moved transversely under spring action to the extent of one sound-groove. Each such movement is preferably carried out in several steps in order to obtain a gentler change-over. Indicator mechanism is also provided on the exterior of casing 1 and under control of the mechanism for effecting transverse movement of the sound-box so as to indicate the sound-groove in which the soundbox is located at any particular time. Rotation of the member 10 is stated to effect electrical switching operations so that, in the recording position, a microphone and, in the reproducing position, a loud-speaker is connected with the amplifier. It is further stated that when member 10 is in its intermediate position and the contact pin falls into the recess in the edge of the record carrier, another electric circuit is closed whereby circuit of motor driving roller 11 is broken and the record carrier is brought to rest. This subject-matter does not appear in the Specification as accepted.