Patent GB-1163062-A (GB)
Title: Improvements in and relating to Sound Reproducing Apparatus.
Inventor: NICHOLAS ALEXANDER
IPC: G11B17/028
Filed: 1967-01-20
Abstract: 1,163,062. Disc record players. H. G. NICHOLAS. 18 April, 1968 [20 Jan., 1967], No. 3074/67. Heading G5R. An assembly for use in a record player comprises:-(a) a record-holding arm movable between a record-holding position and a recordreleasing position; (b) a stylus-carrying arm pivotally mounted on the record-holding arm; and (c) a cam member having a cam surface, the arrangement being such that when a record is held on a revolving turntable, the stylus-carrying arm may be pivoted by operative traverse of the stylus between an outer position and an inner position, and such that when the stylus is at the inner position, movement of the recordholding arm to its record-releasing position causes or allows the stylus-carrying arm to abut the cam surface and thereby move to a position where the stylus is located appropriately in readiness to occupy its outer position. Starting and playing.-A disc record 31, Fig. 4, is inserted from the front of the record player under two record-locating members 48, Figs. 1 and 3, and rested on a turntable 9. When the record is pushed backwards against a lever 32, Fig. 4, a record-holding arm 26, to which the lever is secured, is thereby pivoted downwards about a pin 25, Fig. 3 (assisted by spring 34, Fig. 1) until a rotatable spigot 27, Fig. 4, passes through the centre hole in the record into a co-operating recess in the turntable. At this stage a stylus-carrying arm 40, pivoted at 39, Fig. 4, on the record-holding arm 26, is at its radially outermost position (Fig. 1); it now descends with the record-holding arm until its stylus or needle 52 enters the record groove, Fig. 3. The stylus-carrying arm 40 has affixed thereto a conductive contact member 43 which now comes into wiping contact with a stationary contact member 47, Figs. 1 and 3. A batterydriven motor 11, Fig. 3, is thereby energized and drives the turntable through motor shaft 12, drive wheel 14, Fig. 1, and the turntable rim. Wheel 14 is associated with pivoted links 15, 16 and spring 18. The stylus arm 40 now freely performs a conventional operative traverse until it has moved sufficiently, radially inwardly, to cause disengagement of contacts 43, 47. The motor thereupon stops. Re-setting.-A push rod is now pushed inwards: this push rod consists of a single length of wire having two limbs 36, 37, Fig. 1, and is ' wound about a bolt 38 as a pivot, the free end of the wire bearing against the back of the lower end of lever 32, Fig. 4. This inward push thus serves to rock the record-holding arm 26 upwards about its pivot 25 (again assisted by spring 34), to the Fig. 4 position. During this movement, the stylus arm, rising with the record-holding arm, encounters the undersurface 45, Fig. 4, of a fixed cam member 44, Figs. 1 and 3, and is moved thereby to its radially-outermost position. The apparatus is now in a rest position, and the record 31 may be lifted from the turntable and removed. Other features.-An upstanding projection 42 on the record-holding arm 26 determines the limit of inward movement of the stylus arm 40. A pair of battery-containing compartments 8, Fig. 3, are provided, Preferably the arm 40 and cam member 44 are made of spring steel. Modifccation (not detailed).-The record holding arm is not pivoted, but is formed at one end with a resiliently flexible portion, rigidly mounted; the arm extends diagonally across the turntable and has a centre portion adapted to engage the centre of the record. The arm is moved between its retaining and releasing positions by an actuating member extending normally from the other end of the arm and movable in a direction parallel to the axis of rotation.