Patent GB-460500-A (GB)
Title: Improvements relating to automatic stop mechanisms for magazine gramophones
IPC: G11B17/02
Filed: 1936-07-16
Abstract: 460,500. Magazine gramophones. COLLARO, C., and COLLARO, Ltd. July 16, 1936, No. 19710. [Class 40 (ii)] Automatic stop mechanism for a magazine gramophone comprises an actuating member 31 arranged to be moved by the power of the gramophone motor after the playing of each record and to act on a member 24 so as to bring about the stopping of the gramophone when an intermediate element 26 is moved automatically, upon the discharge of the last record from the magazine, into position to be engaged by the actuating member, and either a manually-operable repeat device adapted to return the intermediate element to an inoperative position and to hold it in that position when it is desired to repeat the playing of the said last record, or mechanism for bringing the intermediate element into operative position at will during operation of the gramophone. The actuating member 31 is in the form of a cam which is mounted on a shaft 7, Fig. 3, adapted to be clutched to the driving motor by mechanism such as that described in Specification 439,106 after the playing of each record, and the intermediate element is constituted by a projection 26 provided on a sleeve 25 disposed on a rod 24 which is adapted to be moved axially to effect the stopping of the gramophone either through the medium of brake mechanism or an electric switch, or of both these devices. The shaft 7 is provided with a cam 8 which engages a pin 9, as shown in Fig. 3, and through links 10, 11 pulls downwardly a rod 13 engaging, at its upper end 13a, the end of a pivoted arm 3. The movement of the arm 3 serves to release the lowermost record of a stack of records mounted on a magazine post 2 as described in Specification 460,501. The uppermost record in the stack is engaged by a pair of pivoted steadying-arms 15 which swing downwardly as the records are released from the stack. The downward movement of the arms 15 operates, when the last record is discharged from the post 2, through a pivoted lever 17, connecting rod 20 and arm 23, to swing the projection 26 into a position in which it is adapted to be engaged by the cam 31 on the shaft 7 after the playing of this last record. The arm 23 is rotatably mounted on the sleeve 25 which surrounds the rod 24 and carries the fixed projection 26 and a shoulder 27, the latter member being normally engaged by a flange 28 on the arm 23 under the action of a spring 29. The cam 31 acts on the projection 26 so as to push this member together with the sleeve 25, arm 23 and rod 24 axially of the rod 24 against the action of a spring 35, Fig. 1. The end 38 of the rod 24 is thereby moved out of engagement with a bell-crank lever 39, which is then pulled by a spring 40, Fig. 5, into a position in which its end 41 opens a tumbler switch 43 controlling the driving motor of the mechanism, and the brake pad 44 at its opposite end engages the rim of the turntable. To repeat playing of a record, a handle 55, Fig. 4, connected to a cam 56 is turned so that a flat edge of the cam bears against the edge of a pivoted arm 57 so as to swing the latter against a spring 59. This movement of the cam 56 operates, through a pin 60 and slot 61, to slide longitudinally a plate 62 in the direction of the arrow 63, and a projection 66 on the plate 62 pushes the arm 10 so that the pin 9, Fig. 8, lies outside the path of the cam 8 ; as a result, at the end of playing a record, the cam 8 does not operate the arm 10 and no new record is delivered to the turntable. If the record to be repeated is the last record in the magazine, the automatic stop mechanism is put out of action, when the record has been played once, by means of a projection 68 which is formed on a vertical part 67 of the plate 62, as shown in Fig. 8, and, when the latter is moved by the lever 55 to its " repeat " position, engages a pin 69 on the sleeve 25 and swings the projection 26 relatively to the arm 23 to a position where it will not be engaged by the cam 31. When the motor is to be re-started, the handle 55 is turned from its neutral position in clockwise direction as shown in Fig. 4 so that the plate 62 moves in opposite direction to the arrow 63 and a projection 71 on the plate 62 moves the' bell-crank lever 39 to release the brake-pad 44 and close the switch 58, the bellcrank lever 39 being latched in this position by the end 38 of the rod 24. As soon as the motor starts, the handle 55 is released and the spring 59 acts to return the arm 57 and cam 56. To enable the motor to be stopped at will during playing of a record, a pushbutton 50, Fig. 6, which is mounted on a vertical rod 46, is depressed against spring action. The rod 46 carries at its lower end a horizontal plate 45 which is normally held by a spring 47, Figs. 1 and 6, so that it overlaps the bevelled end of the lever 23. The plate 45, during its downward movement, swings under the action of the bevelled end of the arm 23 and the spring 47 so as first to clear the said end of the arm and then to take up the position shown at 45b, Fig. 6. On release of the button 50, the rod 46 rises so as to lift the plate 45 and swing the arm 23 and thereby the projection 26 to a position for engagement by the cam 31 on the shaft 7, which is driven through clutch mechanism actuated by the downward movement of the plate 45 in conjunction with a bell-crank lever. When the plate 62 is moved to " repeat " position, a vertical lug on this plate takes up a position close to one arm of the bellcrank lever associated with the clutch mechanism, so that on depression of the button 50, the bell-crank lever actuates this lug to return the plate 62 to its normal position. When the handle 55 is moved to set the mechanism into operation, the edge 72, Fig. 4, of the plate 62 is adapted to engage the projection 26 and to swing the latter, together with the arm 23, so that the bevelled end of the arm 23 snaps past the edge of the plate 45 to an inoperative position.